Mivan-A Versatile Formwork
A SEMINAR
ON
SUBMITED BY
Tilak Bhattacharya (B. E. Civil)
UNDER GUIDANCE
OF
Mr. A. T. Jadhav
RAJARAMBAPU INSTITUTE OF TECHNOLOGY
RAJARAMNAGAR, (Sakharale)
Dist: Sangli
Pin: 415414
2006-2007
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Kasegaon Education Society’s
Rajarambapu Institute of Technology,
Rajaramnagar.
Department of Civil Engineering
This is to certify that the following student of B.E. Civil Engineering has
successfully completed the seminar report entitled
In the partial fulfillment of Bachelor’s Degree in Civil Engineering, of
“Shivaji University, Kolhapur” during academic year
2006-2007.
Name:
Roll No:
TilakBhattacharya
4101
Guide
Mr. A. T. Jadhav
H.O.D.
Principal
Prof. P. S. Patil
Dr.Mrs. S. S. Kulkarni
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INDEX OF CONTENTS
A.
ABSTRACT
i
I.
Introduction ………………………………………1
1.1
1.2
1.3
A Brief Introduction to the Construction Industry…………………….……...3
Housing Scenario in India………………………………………………….…5
Innovations in Construction………………..…………………...………….…8
II.
Formwork
2.1
2.2
2.3
2.4
2.5
Formwork and Formwork Requirements……………………………………11
Classification of Formwork……………………………………………..…...12
Loads acting on Formwork.….........................................................................16
Strength of Formwork (General Design)…………………………………….17
Aluminum Formwork……………………………………....………………..18
III. MIVAN – A Versatile Formwork
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
Background…………………………………………………………………..23
Components of MIVAN Formwork………………………………….………25
Formwork Assembly…………………………………………………………35
Construction through MIVAN Formwork…….……………………………..41
Bespoke Software……………………………………………………………45
Site Management – One day Cycle……………………………………….….46
Speed of Construction – Four Day Cycle……………………………………47
Design Aspects of MIVAN Formwork………………………………………48
Economics……………………………………………………………………49
Quality………………………………………………………………………..50
IV. Advantages and Limitations.
4.1
4.2
4.3
Advantages………………...…………………………………………………51
Limitations…………...………………………………………………………52
Remedies……………………………………………………………………..53
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V.
Case Study – Spaghetti Mass Housing Society.....54
5.1
Discussion……………………………………..………………………….55
VI. Conclusion………………...……………………..56
VII. References…………………………………………i
VIII.List of figures………………………...........………ii
IX. List of tables……………………………………...iii
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1.0 Introduction
Besides, food and clothing, shelter is a basic human need. India has been
successful in meeting the food and clothing requirements of its vast population; however
the problem of providing shelter of all is defying solutions. “While there has been an
impressive growth in the total housing stock from 65 million in 1947 to 187.05
million in 2001, a large gap still exits between the demand and supply of housing
units. The Working Group on Housing for the 9th five-year plan estimated the
housing shortage in 2001 at 19.4 million units- 12.76 million in rural area and 6.64
million in urban area. The shortage of housing is acutely felt in urban areas –more
so in the 35 Indian cities, which according to the 2001 census have a population of
more than a million”. ….. (Carol., 2005).
In metro cities, particularly in Mumbai, Delhi and Kolkata- each having a
population in excess of 10 million- the problem is still aggravated. A host of factors are
responsible such as the phenomenal growth in population- mainly due to relentless rise in
migration- non availability of land, legal hurdles in the form of Land Ceiling and Rent
Control (LCRC) acts, paucity of funds, absence of cost effective construction techniquesto mention only a few. Barring a few exceptions, no serious attempts were made in the
past to find meaningful solutions to these problems. As a result, we are witnessing a large
scale proliferation of slums and squatter settlements in the metros.
The National Housing and Habitat Policy, announced in July 1998, laid stress on
the creation of an enabling environment, wherein government assumed the role of a
facilitator and the private sector was expected to play a vital role in providing large-scale
housing. In the recent years, a number of fiscal measures initiated by the government
have given a boost to the housing sector. The easy availability of finance, coupled with
lower interest rates and a variety of tax incentives announced by the government in the
successive union budgets have triggered massive housing construction in urban and semi
urban areas, especially in the middle and higher income groups. However, the low
income groups seem to have been left out of the current housing boom.
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IN A DEMOCRATIC SET-UP of INDIA, one would agree that this section of the
population cannot be ignored and that they also need to be provided with affordable
housing; but how this can be achieved remains a permanent question. In this context, the
recent affords made in Mumbai under the aegis of the Metropolitan Urban Transport
Project (MUTP), Metropolitan Urban Infrastructure Project (MUIP), and the Slum
Rehabilitation Authority (SRA) of the government of Maharashtra can provide some
guidance. “It is reported that under MUTP and the MUIP schemes nearly 50,000
tenements are being constructed presently and about 20,000 families have already
shifted to new flats”. Editor (ICJ).
This paper deals with all the aspects of MIVAN technology, an aluminium
formwork developed by the company MIVAN itself. The salient features of this
formwork are its speed of construction, quality of construction, seismic resistivity and its
economy. All these features are elaborately described in this paper.
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1.1 A Brief Introduction to the Construction Industry
Construction is one of the significant sectors of Indian economy and is an integral
part of the development. Today India’s urban population is the second largest in the
world and its future development leads to increased demand for housing To cope with
this problem India should desperately need to plan for acquisition of land and rapid
creation of dwelling units. Construction is a complex process involving basically the
areas of Architectural planning, Engineering & Construction.
Despite of the boom in construction activities in urban centers in recent years
across the country, the scenario on the housing front remains far from satisfactory.
“Latest statistics indicate that the total housing shortage in the urban sector was
7.75 million in 1997. An additional demand of 9.7 million units is expected to be
generated in this sector during the period 2002–2007. According to the Federation
of Indian Chamber of Commerce and Industries (FICCI), keeping in view the
existing housing crisis, the country shall need addition of more 2.5 million new
dwelling units annually”.…..( Kulkarni, 2001). The recent years voiced the active
participation private sectors in finding the solution over the prevailing situation on
housing front.
Keeping in view the gigantic task of providing affordable shelter to masses,
adoption of a cost – effective technology assumes greater significance. The present strain
on Indian economy and the overgrowing demands for housing calls for adoptions of
appropriate building technology which could lead to economy and speed in construction.
As a result of experimentation of innovate construction techniques and modern
construction management it is now possible to achieve an overall saving to the extent of
10% in the total cost of housing construction compared to the cost of traditional housing.
There is growing realization today that speed of construction needs to be given
greater importance especially for large housing projects. This is not only essential for the
faster turnover of equipment and investment – leading possible to the reduction in the
housing cost – but also for achieving the national objective of creating a large stock to
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overcome shortest possible time. Fortunately some of the advanced technologies catering
to faster speed of construction are already available in the country. For e.g.
prefabrication, autoclaved blocks, tunnel formwork, aluminum formwork (MIVAN
Technology) of construction etc.
1.2 Housing scenario in India
The progress made by the construction industry of any country could be
considered as the index of development of that country. Further, the number of pucca
houses built in any country could be another index. While there has been a progressive
rise in stock of housing in India since independence, the speed thereof has not kept pace
with the rapid growth of population and urbanization. As a result, the shortage of
accommodation is increasing continuously and the situation has become acute in urban
areas.
Table 1.1:- Total population and percentage of population in unauthorized
construction.* (Source: Table 500-012 of census India 2001)
Year
Population
Million
Population in authorized Population in unauthorized
accommodation, million %
accommodation, million %
1961 4.15
0.50
12
1971 5.97
1.60
27
1981 8.23
3.25
40
1991 9.93
4.45
45
2003 12.50
6.25(approx)
50
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Table 1.2:- Shortage of housing in India (all figures in million) **
** Source: As per estimates of National Building Organization
From the above tables and graphs the following pictures emerges:i) While the total number of households (housing shelter) have increased by about
30 Percent, between 1961to 2003, the total shortage continues to be the same at
about 20% of the total households.
ii) The increase in shortage of housing in urban areas has been 50 percent as
against 25 percent in rural areas.
“The severity of the problem is critical especially in the metropolitan area
and a classic example is Mumbai, the housing shortage is as high as 50 percent as
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against national average of 20 percent”…. (Telang.,2005). “The problem of housing
the millions is gigantic and complex and it needs a totally innovative governmental,
social and technical approach for arriving at workable solutions, consistent with
limitations of a democratic setup”. ….. (Bongiwar.,2005)
1.3 INNOVATIONS IN CONSTRUCTION
The traditional mode of construction for individual houses comprising load
bearing walls with an appropriate roof above or reinforced concrete (RC) framed
structure construction with infill masonry walls would be totally inadequate for mass
housing construction industry in view of the rapid rate of construction. Further, such
constructions are prone to poor quality control even in case of contractors with
substantial resources and experience.
“For undertaking mass housing works, it is necessary to have innovative
technologies which are capable of fast rate construction and are able to deliver good
quality and durable structure in cost effective manner”.…..( Shrikande., et.al,2005)
Several systems are adopted at different places in the world; eventually the
systems which are reasonably economical and easy for operation with skilled labor are
useful in India. Certain systems are in vogue and more and more contractors are trying to
bring in new technologies. These are essentially based on the basis of mode of
construction, namely, pre-cast construction or in-situ construction.
1.3.1:- Cast-in-Situ Construction
Pre-cast and cast-in-situ are techniques that are used for quick construction. Precast includes the wall-panel units and slab units directly added to building structure. The
use of aluminium also evolved as one of the technique for quick construction by use of
aluminium and steel (tunnel) formwork. As a matter of fact the cost of the formwork
may be up to 25% of cost of the structure in building work, and even higher in
bridges, it is thus essential that the forms are properly designed to effect economy
without sacrificing strength and efficiency.
Certain patented systems based on imported technologies such as “Mascon
System” (Canada), “Mivan System” (Malaysia) have come on the Indian scene in recent
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years. In these systems traditional column and beam construction is eliminated and
instead walls and slabs are cast in one operation at site by use of specially designed, easy
to handle (with minimum labor and without use of any equipment) light weight
pre-engineered aluminium forms. Rapid construction of multiple units of a repetitive type
can be achieved with a sort of assembly line production by deployment of a few semiskilled labors.
The entire operation essentially comprises fitting and erecting the portion of
shuttering as already determined (the optimization in use is determined by appropriate
planning) and then carrying out concreting of the walls and slabs. Props are so designed
that they stay in position while de-shuttering of slabs and/or takes place. The dimensional
accuracy of the formwork is of high order. Therefore any possibility of errors does not
rise.
1.3.2 “3-S” SYSTEM OF PRECAST CONSTRUCTION
An engineered system of building construction, namely “3-S” system was
developed by B.G.SHIRKE CONSTRUCTION TECH LTD., for achieving, speed,
strength, safety and economy in construction practices. The system involves structural
elements such as pre-cast hollow column shells pre-cast concrete beams, light weighed
reinforced cellular autoclaved concrete slabs for floor and roofs constituting the basic
structural formwork. The “3-S” system involves activities for construction of building
such as:
I. Cast in-situ sub-structure including foundations, stem columns, plinth beams,
plinth masonry.
II. Erection of partial pre-cast components, jointing of these components using cast
in-situ concrete with appropriate reinforcement.
III. Lying of reinforced cast in-situ screed over slab panels, construction of panels,
construction of walling, flooring, plastering, water proofing etc.
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Achieving the “3-S” system in the MIVAN formwork is quite easy. MIVAN
formwork has got the unsurpassed speed of construction due to saving time for required
time in masonry and plastering. The strength of raw aluminium is very less but when
alloyed with other materials prove to be strong enough to use as a formwork . To ensure
safety in the site, an integrated safety/ working platform is developed which ensures
labor safety during erection and striking of the formwork. Economy is also one of the
main factors of any system. The MIVAN formwork proves to cost efficient as it can be
used efficiently for 250 times.
1.3.3 Present Technologies Available in INDIA
Some of the advanced technologies of formwork catering to the speed of
construction are given below:
To name a few:1) The Prefabrication Technology: - The Pre-cast concrete elements in roofs,
floors and in walls have become more common as these eliminate shuttering;
centering & plastering labor and saves material cost.
Fig 1.1: - Prefabricated Technology (Raymond, 2001)
2) Tunnel Formwork Technology: - It is a technology constructing large no of
housing within short time using steel forms to construct walls & slabs in one
continuous pour.
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Fig 1.2:- Tunnel formwork (Raymond, 2001)
3) Outinard Technology :- Outinard’s superior engineering, the use of high quality steel
and High Performance quality control result in a vastly superior Wall Form system.
Fig 1.3: -Outinard Technology (Raymond, 2001)
4) Mascon Technology:-The Mascon Construction System is a system for forming the
cast in-place concrete structure of a building. It is also a system for scheduling and
controlling the work of other construction trades such as; steel reinforcement, concrete
placement, and mechanical and electrical trades.
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Fig 1.4: - Mascon Technology. (Raymond, 2001)
Chapter 2
2. FORMWORK
When concrete is placed, it is in plastic state. It requires to be supported by
temporary supports and castings of desired shape till it becomes sufficiently strong to
support its own weight. This temporary casing is known as the formwork or forms or
shuttering. The term moulds is sometimes used to indicate formwork of relatively small
units such as lintels, cornices etc.
2.1.1 Definition of formwork:“Forms or moulds or shutters are the receptacles in which concrete is placed,
so that it will have desired shape or outline when hardened. Once concrete develops
the adequate strength to support its own weight they can be taken out”. .. (ACC).
“Formwork is the term given to either temporary or permanent moulds into
which concrete or similar materials are poured”. … (Wikipedia Encyclopedia).
2.1.2 Requirements of a good formwork
The essential requirements of formwork or shuttering are: a) It should be strong enough to take the dead and live loads during construction.
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b) The joints in the formwork should be rigid so that the bulging, twisting, or
sagging due to dead and live load is as small as possible. Excessive deformation may
disfigure the surface of concrete.
c) The construction lines in the formwork should be true and the surface plane so
that the cost finishing the surface of concrete on removing the shuttering is the least.
d) The formwork should be easily removable without damage to itself so that it
could be used repeatedly.
2.2 Classification of Formwork
Formwork can be classified according to a variety of categories, relating to the differences
in sizes, the location of use, construction materials, nature of operation, or simply by the
brand name of the products. However, the huge amount of tropical wood being
consumed each year for formwork has resulted in criticism from environmentalists,
as well as the continual escalation of timber prices. As a result, there has been a strong
tendency to use other formwork materials or systems to replace timber. The different
categories in which formwork can be classified are:
a) According to size.
b) According to location of use.
c) According to materials of construction.
d) According to nature of operation.
e) According to brand name of the product.
2.2.1 Classification according to size
Classification according to the size of formwork can be very straightforward. In
practice, there are only two sizes for formwork; small-sized and large-sized. Any size
which is designed for operation by workers manually is small-sized. Very often, the
erection process is preferably handled by a single worker, with site work best done
independently to avoid possible waiting times. Due to reasons of size and weight, the
materials and construction of small-sized formwork are thus limited. At present, the most
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common systems are made of timber and aluminium, and are usually in the form of small
panels. There is seldom medium-sized formwork. In cases in which large-sized formwork
is used, the size of the form can be designed as large as practicable to reduce the amount
of jointing and to minimize the amount of lift. The stiffness required by large-sized
formwork can be dealt with by the introduction of more stiffening components such as
studs and soldiers. The increase in the weight of the formwork panels is insignificant as a
crane will be used in most cases.
2.2.2 Classification according to the location of use: There are not many effective formwork systems for stairs and staircases. The complicated
three-dimensional nature of an element involving suspended panels and riser boards, as
well as the need to cope with very different spatial and dimensional variances as required
by individual design situations, cannot be achieved by a universally adaptable formwork
system (fig 2.1).
Fig 2.1 - Staircase under traditional formwork arrangement using timber (Raymond.
2001)
Classification according to materials of construction
Materials used for formwork are traditionally quite limited due to finding the
difficult balance between cost and performance. Timber in general is still the most
popular formwork material for its relative low initial cost and adaptability Steel, in the
form of either hot-rolled or cold-formed sections and in combination with other sheeting
materials, is another popular choice for formwork materials.In the past two to three years,
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full aluminium formwork systems have been used in some cases but the performance is
still being questioned by many users, especially in concern to cost and labor control (fig
2.2 & 2.3).
Fig 2.2 - Typical steel form system to construct a core
Fig 2.3 - Aluminium formwork for wall, floor
wall.
and other architectural features (source
Raymond,2001).
2.3
Classification according to nature of operation
Formwork can be operated manually or by other power-lifted methods. Some
systems are equipped with a certain degree of mobility to ease the erection and striking
processes, or to allow horizontal moment using rollers, rails or tracks.
Timber and aluminium forms are the only manually-operable types of formwork.
They are designed and constructed in ways that they can be completely handled
independently without the aid of any lifting appliances. On the other end of the scale,
such systems are used in very large-sized and horizontally-spread buildings with
complicated layout designs which require the systems' flexibility. Fig 2.4 & 2.5 shows the
formwork system allowing the incorporation of pre-cast elements and self climbing form
with hydraulic jack devices respectively.
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Photo 2.4 - formwork system allowing the Photo 2.5 - example of a self-climbing form
with
Incorporation of pre-cast elements (govt. quarters)
(source Raymond,
2001)
detail of the hydraulic jack devices
2.5 Classification according to brand name of the product
Several patented or branded formwork systems have successfully entered the local
construction market in the past decade. These include products from brands SGB, RMD,
VSL, MIVAN, Thyssen and Cantilever. Each of these firms offers its own specialised
products, while some can even provide a very wide range of services including design
support or tender estimating advice. As the use of innovative building methods is gaining
more attention from various sectors in the community, advanced formwork systems are
obviously a promising solution. The input through research and development by the wellestablished formwork manufacturers is of no doubt contributing to efforts in these areas.
(fig 2.6)
Fig 2.6:-VSL FORMWORK (Source Raymond, 2001)
2.3 Loads acting on Formwork
In Construction, the formwork has to bear, besides its own weight, the weight of
wet concrete, the live load due to labor, and the impact due to pouring concrete and
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workmen on it. The vibration caused due to vibrators used to compact the concrete
should also be taken care off. Thus, the design of the formwork is an essential part during
the construction of the building.
For the design of planks and joists in bending & shear, a live load including the
impact may be taken as 370kg/m². It is however, usual to work with a small factor of
safety in the design of formwork. The surfaces of formwork should be dressed in such a
manner that after deflection due to weight of concrete and reinforcement, the surface
remains horizontal, or as desired by the designer. The sheathing with full live load of 370
kg/m² should not deflect more than 0.25 cm and the joists with 200kg/m² of live load
should not deflect more than 0.25cm.
In the design of formwork for columns or walls, the hydrostatic pressure of the
concrete should be taken into account. This pressure depends upon the quantity of water
in the concrete, rate of pouring and the temperature.
The hydrostatic pressure of the concrete increases with the following cases: Increase in quantity of water in the mix.
 The smaller size of the aggregate.
 The lower temperature.
 The higher rate of pouring concrete.
If the concrete is poured in layers at an interval such that concrete has time to set,
there will be very little chance of bulging.
Aluminium as usual is not a very strong material. So the basic elements of the
formwork system are the panel which is a framework of extruded aluminium sections
welded to an aluminium sheet. It consists of high strength special aluminium
components. This produces a light weight panel with an excellent stiffness-to-weight
ratio, yielding minimal deflections when subjected to the load of weight concrete. The
panels are manufactured in standard sizes with non-standard elements produced to the
required size and size to suit the project requirements.
2.4 Design Aspects
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In MIVAN formwork we give stress on shear wall rather than conventional
framed structure of columns and beams. In general the design of a wall formwork is
described as under.
Consider designing a wall for 30 cm thick and 5 m high. The concrete is poured at
shifts of 1.5 m each. The sheathing is placed horizontally and spans between vertical
studs are under horizontal pressure due to wet concrete. These Studs are backed by the
horizontal pieces called Wales which are tied by bolts, passing through the wall. Thus
pressure on either side of the wall is self balanced as shown fig 2.4.1.
The pressure exerted by concrete will be 2300 equivalent weight of fluid at a
depth of h meters. Taking lowest portion of the sheathing, the pressure is equal to 2300 x
1.5 =3450 kg/ sq.m. If the sheathing is 25 cm thick, the spacing x of the studs is given by
M=bd²/6 x σ;
σ = 102 kg/ sq cm where σ is safe fiber-stress.
Or,
Or,
3450 x x² = 1 x 2.5²/6 x 102
100² x 10
x = 55.5 cm.
Adopt the spacing of 55 cm apart.
If the spacing of wales is 68cm, the average
pressure on the studs between two bolts will be
2300(1.5-68/2) x .55 =1468 kg per meter run,
assuming concrete pouring is started at level of
a low bolts.
Max S.F. at edges of clear span = 1468 x 0.6/2 = 440 kg.
Assume studs to be 7.5 cm x 10 cm,
Shear stress = 3/2 x 440/(7.5 x 10) = 8.8 kg/ sq cm.
Maximum fiber stress = 6785 x 10/2 = 54.3 kg/ sq cm.
7.5 x 10³/12
So the section adopted is satisfactory.
2.5:- Aluminium Formwork
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The panels of aluminium formwork are made from high strength aluminium alloy,
with the face or contact surface of the panel, made up of 4mm thick plate, which is
welded to a formwork of specially designed extruded sections, to form a robust
component. The panels are held in position by a simple pin and wedge arrangement
system that passes through holes in the outside rib of each panel. The panel fits precisely,
securely and requires no bracing. The walls are held together with high strength wall ties,
while the decks are supported by beams and props.
Since the equipment is made of aluminium, it has sections that are large enough to
be effective, yet light enough in the weight to be handled by a single worker. Individual
workers can handle all the elements necessary for forming the system with no
requirement for heavy lifting equipment or skilled labor. By ensuring repetition of work
tasks on daily basis it is possible for the system to bring assembly line techniques to
construction site and to ensure quality work, by unskilled or semi-skilled workers.
Trial erection of the formwork is carried out in factory conditions which ensure
that all components are correctly manufactured and no components are missed out. Also,
they are numbered and packed in such a manner so as to enable easy site erection and
dismantling.
2.5.1 MERITS OF ALUMINIUM FORMWORK:i. In contrast to most of the modern construction systems, which are machine and
equipment oriented, the formwork does not depend upon heavy lifting equipment
and can be handled by unskilled labors.
ii. Fast construction is assured and is particularly suitable for large magnitude
construction of respective nature at one project site.
iii. Construction carried out by this system has exceptionally good quality with
accurate dimensions for all openings to receive windows and doors, right angles
at meeting points of wall to wall, wall to floor, wall to ceiling, etc, concrete
surface finishes are good to receive painting directly without plaster.
iv. System components are durable and can be used several times without sacrificing
the quality or correctness of dimensions and surface.
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v. Monolithic construction of load bearing walls and slabs in concrete produces
structurally superior quality with very few constructions joined compared to the
conventional column and beam slabs construction combined with filter brick work
or block work subsequently covered by plaster.
vi. In view of the four – day cycle of casting the floor together with all slabs as
against 14 to 20 – day cycle in the conventional method, completed RCC structure
is available for subsequent finish trades much faster, resulting in a saving of 10 to
15 days per floor in the overall completion period.
vii. As all the walls are cast monolithic and simultaneously with floor slabs requiring
no further plasters finish. Therefore the time required in the conventional method
for construction of walls and plastering is saved.
viii. As fully completed structural frame is made available in one stretch for
subsequent – finishing items, uninterrupted progress can be planned ensuring,
continuity in each trade, thereby providing as cope for employing increased labor
force on finishing item.
ix. As the system establishes a kind of “Assembly line production” phase – wise
completion in desired groups of buildings can be planned to achieve early
utilization of the buildings.
2.5.2: -Comparison of Aluminum Form Construction Technique Over
Conventional Forms:
Advantages of aluminium formwork over conventional construction
i. More seismic resistance: - The box type construction provides more seismic
resistance to the structure.
ii. Increased durability: - The durability of a complete concrete structure is more
than conventional brick bat masonry.
iii. Lesser number of joints thereby reducing the leakages and enhancing the
durability.
iv. Higher carpet area- Due to shear walls the walls are thin thus increasing area.
v. Integral and smooth finishing of wall and slab- Smooth finish of aluminium can
be seen vividly on walls.
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vi. Uniform quality of construction – Uniform grade of concrete is used.
vii. Negligible maintenance – Strong built up of concrete needs no maintenance.
viii. Faster completion – Unsurpassed construction speed can be achieved due to light
weight of forms
ix. Lesser manual labour- Less labour is required for carrying formworks.
x. Simplified foundation design due to consistent load distribution.
xi.The natural density of concrete wall result in better sound transmission
coefficient.
Table 2.1:- RELATIVE COMPARISON OF IN – SITU “ALUMINIUM FORM”
SYSTEM WITH CONVENTIONAL CONSTRUCTION.
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Sr.
No
1
2
FACTOR
Quality
IN – SITU ALUMINIUM
FORM SYSTEM
CONVENTIONAL
Normal
The pace of construction is
slow due to step – by – step
completion of different
stages of activity the
masonry is required to be
laid brick by brick.
Speed
of
Erection of formwork,
construction.
concreting
and
deshuttering forms is a two
–
week
cycle.
The
plastering
and
other
finishing activities can
commence only thereafter.
Aesthetics.
In the case of RCC
structural framework of
column and beams with
partition brick walls is used
for
construction,
the
columns and beams show
unsightly projections in
room interiors.
4
External
finishes.
Cement
plastered
brickwork, painted with
cement – based paint.
Finishing needs painting
every in three years.
5
Useful carpet Efficiency around 83.5%
3
24
REMARKS
Superior.
In – Situ casting of whole
structure and transverse walls
done in a continuous operation,
using controlled concrete mixers
obtained from central batching,
mixing plants and mechanically
placed through concrete buckets
using crane and compacted in
leak proof moulds using high
frequency vibrators
In this system, the walls and
floors are cast together in one
continuous operation in matter of
few hours and in built
accelerated curing overnight
enable removal and re-use of
forms on daily cycle basis.
Superior quality
in “System
housing”
System
construction is
much faster.
The Room – Sized wall panels
and the ceiling elements cast
against steel plates have smooth
finishing and the interiors have
neat and clean lines without
unsightly projections in various
corners. The walls and ceilings
also have smooth even surfaces,
which only need colour/white
wash
Textured / pattern coloured
concrete facia can be provided.
This will need no frequent
repainting.
Permanent facia
finishes feasible
with
minor
extra initial cost
Efficiency around 87.5%
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area as % of
plinth area.
utilization
of
land for useful
living space.
Consumption
of basic raw
materials
Normal
Cement.
6
Reinforcing
Steel
Maintenance
7
Consumption somewhat more Although
than that used in conventional greater
structures.
consumption
strength
and
durability
is
also more
Reinforcing steel required
is less as compared to the
in situ construction as RCC
framework uses brick wall
as alternative
In maintenance cost, the
major
expenditure
is
involved due to :
 Repairs and maintenance
of plaster of walls /
ceiling etc.
 Painting of outer and
inner walls.
Leakages due to plumbing
and sanitation installation.
25
It may, however will be slightly
more than corresponding load –
bearing brick wall construction
for which, requirements of IS
456 have to be followed for
system housing.
The walls and ceiling being
smooth and high quality concrete
repairs for plastering and
leakage’s are not at all required
frequently.
Steel
requirement is
more, as it is
required for the
shear
wall
construction.
But shear wall
construction
increases safety
against
earthquake.
It
can
be
concluded that
maintenance
cost
is
negligible.
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3.0 MIVAN: - A Versatile Formwork
The system of aluminum forms (MIVAN) has been used widely in the
construction of residential units and mass housing projects. It is fast, simple, adaptable
and cost – effective. It produces total quality work which requires minimum maintenance
and when durability is the prime consideration. This system is most suitable for Indian
condition as a tailor–made aluminum formwork for cast–in–situ fully concrete structure.
Background
Mivan is basically an aluminium formwork system developed by one of the
construction company from Europe. In 1990, the Mivan Company Ltd from Malaysia
started the manufacturing of such formwork systems. Now a days more than 30,000 sq m
of formwork used in the world are under their operation. In Mumbai, India there are
number of buildings constructed with the help of the above system which has been
proved to be very economical and satisfactory for Indian Construction Environment.
The technology has been used extensively in other countries such as Europe, Gulf
Countries, Asia and all other parts of the world. MIVAN technology is suitable for
constructing large number of houses within short time using room size forms to construct
walls and slabs in one continuous pour on concrete. Early removal of forms can be
achieved by hot air curing / curing compounds. This facilitates fast construction, say two
flats per day. All the activities are planned in assembly line manner and hence result into
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more accurate, well – controlled and high quality production at optimum cost and in
shortest possible time.
In this system of formwork construction, cast – in – situ concrete wall and floor
slabs cast monolithic provides the structural system in one continuous pour. Large room
sized forms for walls and floors slabs are erected at site. These forms are made strong and
sturdy, fabricated with accuracy and easy to handle. They afford large number of
repetitions (around 250). The concrete is produced in RMC batching plants under strict
quality control and convey it to site with transit mixers.
The frames for windows and door as well as ducts for services are placed in the
form before concreting. Staircase flights, façade panels, chajjas and jails etc. and other
pre-fabricated items are also integrated into the structure. This proves to be a major
advantage as compared to other modern construction techniques.
The method of construction adopted is no difference except for that the sub –
structure is constructed using conventional techniques. The super–structure is constructed
using MIVAN techniques. The integrated use the technology results in a durable
structure.
3.1 Modular Formwork
The formwork system is precisely-engineered system fabricated in aluminium.
Using this system, all the elements of a building namely, load bearing walls, columns,
beams, floor slabs, stairs, balconies etc can be constructed with cast in place concrete.
The resulting structure has a good quality surface finish and accurate dimensional
tolerances. Further, the construction speed is high and the work can be done in a cost
effective manner.
The modular nature of the formwork system allows easy fixing and removal of
formwork and the construction can proceed speedily with very little deviation in
dimensional tolerances. Further, the system is quite flexible and can be easily adapted for
any variations in the layout.
The availability of concrete from ready mix concrete facility has augured well for
the use of this work system. However, the proliferation of RMC facilities in the cities in
India and the willingness to use mechanized means of transport and placing of concrete,
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the use of aluminium formwork system has received a boost. The quality of the resulting
concrete is found to be superior.
Structurally speaking, the adoption of the closed box system using monolithic
concrete construction has been found to be the most efficient alternatives. The stresses in
both the concrete and steel are observed to be much lower even when horizontal forces
due to wind or earthquake are taken into consideration.
The formwork system can be used for construction for all types of concrete
systems, that is, for a framed structure involving column beam –slab elements or for boxtype structure involving slab-walls combination.
3.2 FORMWORK – COMPONENTS:
The basic element of the formwork is the panel, which is an extruded aluminium
rail section, welded to an aluminium sheet. This produces a lightweight panel with an
excellent stiffness to weight ratio, yielding minimal deflection under concrete loading.
Panels are manufactured in the size and shape to suit the requirements of specific
projects.
The panels are made from high strength aluminium alloy with a 4 mm thick skin
plate and 6mm thick ribbing behind to stiffen the panels. The panels are manufactured in
MIVAN’S dedicated factories in Europe and South East Asia. Once they are assembled
they are subjected to a trial erection in order to eliminate any dimensional or on site
problems.
All the formwork components are received at the site whining three months after
they are ordered. Following are the components that are regularly used in the
construction.
3.2.1: -WALL COMPONENTS:
1) Wall Panel: - It forms the face of the wall. It is an Aluminium sheet properly
cut to fit the exact size of the wall
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FIG 3.1: WALL PANEL
2) Rocker: - It is a supporting component of wall. It is L-shaped panel having
allotment holes for stub pin.
FIG 3.2: ROCKER
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3) Kicker: - It forms the wall face at the top of the panels and acts as a ledge to
support
FIG 3.3: KICKER
4) Stub Pin: - It helps in joining two wall panels. It helps in joining two joints
FIG 3.4: STUB PIN
3.2.2:
- BEAM COMPONENTS:
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1) Beam Side Panel: - It forms the side of the beams. It is a rectangular structure
and is cut according to the size of the beam
FIG 3.5: BEAM SIDE PANEL
2) Prop Head for Soffit Beam: - It forms the soffit beam. It is a V-shaped head
for easy dislodging of the formwork.
FIG 3.6: PROP HEAD FOR SOFFIT BEAM.
3) Beam Soffit Panel: - It supports the soffit beam. It is a plain rectangular
structure of aluminium.
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FIG 3.7: BEAM SOFFIT-PANEL
4) Beam Soffit Bulkhead: - It is the bulkhead for beam. It carries most of the bulk
load.
FIG 3.8: - BEAM SOFFIT BULKHEAD
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3.2.3: DECK COMPONENT:
1) Deck Panel: - It forms the horizontal surface for casting of slabs. It is built for
proper safety of workers.
FIG 3.9: - DECK PANEL
2) Deck Prop: - It forms a V-shaped prop head. It supports the deck and bears the
load coming on the deck panel.
FIG 3.10: -DECK PROP
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3) Prop Length: - It is the length of the prop. It depends upon the length of the
slab.
FIG 3.11: - DECK PROP LENGTH
4) Deck Mid – Beam: - It supports the middle portion of the beam. It holds the
concrete.
FIG 3.12: - DECK MID-BEAM
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5) Soffit Length: - It provides support to the edge of the deck panels at their
perimeter of the room.
FIG 3.13: - SOFFIT LENGTH
6) Deck Beam Bar: - It is the deck for the beam. This component supports the deck
and beam.
FIG 3.14: -DECK BEAM BAR
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3.2.4: OTHER COMPONENTS:
1) Internal Soffit Corner: - It forms the vertical internal corner between the
walls and the beams, slabs, and the horizontal internal cornice between the
walls and the beam slabs and the beam soffit.
FIG 3.15: -INTERNAL SOFFIT CORNER
2) External Soffit Corner: - It forms the external corner between the components
FIG 3.16: -EXTERNAL SOFFIT CORNER
3) External Corner: - It forms the external corner of the formwork system.
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FIG 3.17: - EXTENAL CORNER
4) Internal Corner: - It connects two pieces of vertical formwork pieces at their
exterior intersections. Fig 3.18
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FIG 3.18: - INTERNAL CORNERS
3.2.5: FORMWORKS ASSEMBLE:
MIVAN aims in using modern construction techniques and equipment in all its
projects. On leaving the MIVAN factory all panels are clearly labeled to ensure that they
are easily identifiable on site and can be smoothly fitted together using the formwork
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modulation drawings. All formwork begins at a corner and proceeds from there. (Fig.
No.3.19, Fig no 3.20).
FIG 3.19: - WALL ASSEMBLY DETAILS
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FIG 3.20: - BEAM ASSEMBLY DETAILS
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3.2.6: SIMPLICITY – PIN AND WEDGE SYSTEM:
The panels are held in position by a simple pin and wedge system that passes
through
holes
in
the
outside
rib
of
each
panel.
(Fig.No.3.21)
The panels fit precisely, simply and securely and require no bracing. Buildings can be
constructed quickly and easily by unskilled labour with hammer being the only tool
required. Once the panels have been numbered, measuring is not necessary. As the
erection process is manually, tower cranes are not required. The result is a typical 4 to 5
day cycle for floor – to – floor construction.
3.2.7 EFFICIENT – QUICK STRIP PROP HEAD:
One of the principal technical features which enables this aped to be
attained using a single set of formwork panel is the unique V shaped a prop head which
allows the ‘quick strip’ to take place whilst leaving the propping undisturbed. The deck
panels can therefore be resumed immediately. (Fig.No.3.22).
3.3 CONSTRUCTION ACTIVITIES WITH MIVAN AS FORMWORK
The construction activities are divided as pre – concrete activities, during
concreting and post – concrete activities. They are as follows:
3.3.1 PRE – CONCRETE ACTIVITIES:
a) Receipt of Equipment on Site – The equipments is received in the site as ordered.
b) Level Surveys – Level checking are made to maintain horizontal level check.
c) Setting Out – The setting out of the formwork is done.
d) Control / Correction of Deviation – Deviation or any correction are carried out.
e) Erect Formwork – The formwork is erected on site.
f) Erect Deck Formwork – Deck is erected for labours to work.
g) Setting Kickers – kickers are provided over the beam.
After the above activities have been completed it is necessary to check the
following.
i.
All formwork should be cleaned and coated with approved realize agent.
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ii.
Ensure wall formwork is erected to the setting out lines.
iii.
Check all openings are of correct dimensions, not twist.
iv.
Check all horizontal formwork (deck soffit, and beam soffit etc.) in level.
v.
Ensure deck and beam props are vertical and there is vertical movement in
the prop lengths.
vi.
Check wall ties, pins and wedges are all in position and secure.
vii.
Any surplus material or items to be cleared from the area to be cast.
viii.
Ensure working platform brackets are securely fastened to the concrete.
3.3.2 ON CONCRETE ACTIVITIES:
At least two operatives should be on stand by during concreting for checking pins,
wedges and wall ties as the pour is in progress. Pins, wedges or wall ties missing could
lead to a movement of the formwork and possibility of the formwork being damaged.
This – effected area will then required remedial work after striking of the formwork.
Things to look for during concreting:
i.
ii.
Dislodging of pins / wedges due to vibration.
Beam / deck props adjacent to drop areas slipping due to vibration.
iii.
Ensure all bracing at special areas slipping due to vibration.
iv.
Overspill of concrete at window opening etc.
3.3.3 POST – CONCRETE ACTIVITIES:
i) Strike Wall Form- It is required to strike down the wall form.
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ii) Strike Deck Form- The deck form is then removed.
iii) Clean, Transport and stack formwork
iv) Strike Kicker Formwork – The kicker are removed.
v) Strike wall – Mounted on a Working Platform the wall are fitted on next
floor.
vi) Erect Wall – Mount Working Platform and the wall is erected.
Normally all formwork can be struck after 12 hours.
The post – concreting activities includes:
3.3.4 CLEANING:
All components should be cleaned with scrapers and wire brushes as soon as they
are struck. Wire brush is to be used on side rails only.
The longer cleaning is delayed, the more difficult the task will be. It is usually
best to clean panels in the area where they are struck.
3.3.5 TRANSPORTING:
There are basic three methods recommended when transporting to the next floor:
i.
The heaviest and the longest, which is a full height wall panel, can be
carried up the nearest stairway.
ii.
Passes through void areas.
iii.
Rose through slots specially formed in the floor slab for this purpose.
Once they have served their purpose they are closed by casting in
concrete filter.
3.3.6 STRIKING:
Once cleaned and transported to the next point of erection, panels should be
stacked at right place and in right order.
Proper stacking is a clean sign of a wall – managed operation greatly aids the next
sequence of erection as well as prevents clutters and impend other activities.
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Fig 3.1: - Erection of Platform
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Fig 3.2:- Striking of formwork
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Fig 3.3: - Positioning of Platform
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Fig 3.4: - Removal of kicker
3.4 SOFTWARE APPLICATION TO FORMWORK DESIGN
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The formwork is designed using the most economical assortment of panel sizes
with the help of the state-of-the art design software. The use of the software along with
the experience and skill of the designers ensures an efficient construction process by
incorporating the optimum assembly procedures, economical panel selection and
ultimately minimizing capital and operational costs.
The formwork requirement depends upon various parameters such as desired
speed of construction, economy required. After considering all of these, various options
are offered at the estimate stage to the client. The system is flexible in design and can
form any architectural or structural configuration, such as stairs, bay windows, curved
features etc. Designers consult the architects and structural designers during design stage
in order to avoid costly modifications of RC members during construction stage.
It is thus essential to select the most practical and economic blend of standard formwork
components required for the building at the preconstruction design phase itself.
Using Bespoke design software, the formwork is designed using the most
economical assortment of panel sizes. The combination of bespoke software and the
experience of MIVAN designer’s guarantees:a) Most efficient construction process incorporating the optimum
assembly procedures.
b) Economical panel section.
c) Ultimately minimizing capital and operational cost.
3.5 SITE MANAGEMENT
The essence of the system is that it provides a production line approach in the
construction industry. The laborers are grouped together to form small teams to carry out
various tasks within a certain time frame such as, reinforcement, fabrication and erection,
formwork erection, concreting etc.
Scheduling involves the design and development of the work cycle required to
maximize efficiency in the field. The establishment of a daily cycle of work, which when
fully coordinated with different trades such as reinforcement fixing, mechanical services
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installation, and the placing of concrete, includes a highly efficient working schedule in
the system, not just for formwork but for all parallel trades as well.
Optimum use of the labour force is made by ensuring that each trade has
sufficient work on each working day. Experienced site supervisors are sent to site to train
supervisory staff and labour for proper handling of the equipment and to assist in
establishing the desired work cycle. The disciplined and efficient handling of work
ensures that all other trades follow in a united and predetermined manner. The improved
coordination and construction management enables the equipment to be used at optimum
speed and efficiency and speed of the output are outstanding. Thus a disciplined and
systemized approach to construction is achieved.
3.6 SPEED OF CONSTRUCTION
3.6.1 Work cycle
MIVAN is a system for scheduling & controlling the work of other connected
construction trades such as steel reinforcement, concrete placements & electrical inserts.
The work at site hence follows a particular sequence. The work cycle begins with the
deshuttering of the panels. It takes about 12-15hrs. It is followed by positioning of the
brackets & platforms on the level. It takes about 10-15hrs simultaneously.
The deshuttered panels are lifted & fixed on the floor .The activity requires 7-10
hrs.Kicker & External shutters are fixed in 7 hrs. The wall shutters are erected in 6-8 hrs
One of the major activity reinforcement requires 10-12 hrs. The fixing of the electrical
conduits takes about 10 hrs and finally pouring of concrete takes place in these.
This is a well synchronized work cycle for a period of 7 days. A period of 10-12
hrs is left after concreting for the concrete to gain strength before the beginning of the
next cycle. This work schedule has been planned for 1010-1080 sq m of formwork with
72-25cu m of concreting & approximate reinforcement.
The formwork assembling at the site is a quick & easy process. On leaving the
MIVAN factory all panels are clearly labeled to ensure that they are easily identifiable on
site and can be smoothly fitted together using formwork modulation drawings. All
formwork begins from corners and proceeds from there.
The system usually follows a four day cycle: -
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Day 1: -The first activity consists of erection of vertical reinforcement bars and
one side of the vertical formwork for the entire floor or a part of one floor.
Day 2: -The second activity involves erection of the second side of the vertical
formwork and formwork for the floor
Day 3: - Fixing reinforcement bars for floor slabs and casting of walls and slabs.
Day 4: -Removal of vertical form work panels after 24hours, leaving the props in
place for 7 days and floor slab formwork in place for 2.5 days.
3.7 Design Aspects
The comparison is done between buildings constructed by: i)
Conventional RC columns, beams, and slab construction (RC moment
resisting frame d structure)
OR
ii)
RC load-bearing walls and slabs.
In the case of RC moment-resisting framed structures, the horizontal forces due to wind
or earthquake are resisted by the frames resulting in the bending moments in columns to
resist bending moment and vertical loads would be more than that required to resist
vertical loads without bending moment. Similarly, additional reinforcement will be
required in beams at supports.
In the case of RC load-bearing walls, monolithic casting of slab along with RC
walls results in a box type structure, which is very strong in resisting horizontal forces
due to wind or earthquake. In view of large depth of shear walls, the resulting stresses
due to bending moment and vertical loads are smaller and in many cases, concrete alone
is capable of resisting these forces.
On evaluating these alternatives, it is seen that the beam column frame system in
i)
Performs poorly against earthquake forces compared to RCC wall and slab
construction. Recent changes in the IS Codes, as well as recommended
good practice demand provision of additional reinforcement comply with
ductility requirements.
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ii)
The sizing and detailing of columns needed to be –that they are 20%
stronger than beams they support.
3.8 Economics
Comparative costs of building using load bearing wall and slab system and
conventional framed system of column, beams, slab for the construction of a groundplus-seven building is given in Table 3.8.1. It can be seen that the total cost of groundplus-seven building using MIVAN System is Rs.5344/m² which is lower than that in
conventional system is Rs.6034/m².( As calculated by Srinivaschar.P.H, July 2005).
The cost per flat (or per m² built up area) using MIVAN shuttering system
depends upon the number of repetition and period of completion of the project. As the
formwork can be reused over 250 times, the initial cost per unit of forming area is less
when compared to traditional methods. The reduction of cost is also due to the
elimination of brickwork and plaster and also due to reduction in time. The cost of the
project gets substantially reduced due to shear wall construction. These are due to the
reduced consumption of steel, masonry, and plaster even though the use of concrete
decreases. For the same number of repetition, the cost will be less if the period of
completion is longer. This is because for a shorter completion period, the area of
formwork is more than required for longer completion period. Cost of formwork is
illustrated in Table no.3.8.2.
The aluminium formwork provides an integrated scaffolding system which
reduces the cost of scaffolding requirements. The mechanical and electrical installation is
simplified as conduits are embedded in the structure by precise engineering of outlets and
service ducts.
Thus, we can conclude that the overall cost of the project is lesser when compared
to project using traditional methods of formwork.
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Table 3.8.2: - Effect of construction speed on the cost of flat. (Courtesy: Jogeswari
Vikhroli link road, NNP Nivara Parishad,MMRDA)
Description
Construction speed
Period of const.
Forming area
Misc formwork
Total formwork to
be ordered
Cost of formwork
Two third of the
loaded cost
Profit & Overhead
15%
Total Rs.
Cost per flat, Rs
A
3 flats/day
23 months
741.9
55.5
797.4
Construction Speed
B
C
4 flats/day
5 flats/day
18.7 months 16.2 months
989.2
1236.5
55.5
55.5
1044.7
1292
D
6 flats/day
14.2 months
1483.8
55.5
1539
14353200
9568800
18804600
12536400
23256000
1550400
27707400
18471600
1435320
1880460
2325600
2770740
11004120
9825
14416860
12872
17829600
15919
21242340
18966
Note:
Construction period is calculated as follows:
Average 22 pouring of concrete are considered per month.
About 3 months are required for mobilization and getting plinths ready.
About 3 months are required for finishing.
Cost of formwork = $ 360; dollar Exchange Rate = Rs50; No of flats = 1120
(Weight of aluminium formwork = 24 kg/m²).
3.9 QUALITY:
High quality Formwork panels ensure consistency of dimensions. On the removal
of the formwork mould a high quality concrete finish is produced to accurate tolerances
and verticality. The high tolerance of the finish means that no further plastering is
required. Typically a 3mm to 4mm skin coat is applied internally prior to finishing and a
6mm build up coat prior to laying tiles. Care must be taken so that the concert and in
particular the enforcement does not become contaminated due to excessive or negligent
application of the releasing agent.
4.1 The Advantages of this system are:The MIVAN formwork is specifically designed to allow rapid construction of all types of
architectural layouts.
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1) Total system forms the complete concrete structure.
2) Custom designed to suit project requirements.
3) Unsurpassed construction speed.
4) High quality finish.
5) Cost effective.
6) Panels can be reused up to 250 times.
7) Erected using unskilled labor.
Quality and speed must be given due consideration along with economy. Good
quality construction will never deter to projects speed nor should it be uneconomical. In
fact, time consuming repairs and modifications due to poor quality work generally delay
the job and cause additional financial impact on the project. Some experts feel that
housing alternatives with low maintenance requirements may be preferred even if the
initial cost is high.
4.2 LIMITATION OF MIVAN FORMWORK:
Even though there are so many advantages of MIVAN formwork the limitations
cannot be ignored. However the limitations do not pose any serious problems. They are
as follows: -
1) Because of small sizes finishing lines are seen on the concrete surfaces.
2) Concealed services become difficult due to small thickness of components.
3) It requires uniform planning as well as uniform elevations to be cost effective.
4) Modifications are not possible as all members are caste in RCC.
5) Large volume of work is necessary to be cost effective i.e. at least 200 repetitions
of the forms should be possible at work.
6) The formwork requires number of spacer, wall ties etc. which are placed @ 2 feet
c/c; these create problems such as seepage, leakages during monsoon.
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7) Due to box-type construction shrinkage cracks are likely to appear.
8) Heat of Hydration is high due to shear walls.
4.3 REMIDIES
In external walls, ties used in shutter connection create holes in wall after deshuttering.
These may become a source of leakage if care is not taken to grout the holes. Due to boxtype construction shrinkage cracks are likely to appear around door and window openings
in the walls. It is possible to minimize these cracks by providing control strips in the
structure which could be concreted after a delay of about 3 to 7 days after major
concreting. The problem of cracking can be avoided by minimizing the heat of hydration
by using flyash.
5.0 CASE STUDY
The City and Industrial Development Corporation and Organization (CIDCO) of
Maharashtra are responsible for the development of Navi – Mumbai. It has undertaken
massive projects to achieve this goal and has encouraged use of latest technologies to
complete these projects. In recent years it has undertaken large – scale constructions of
houses in Navi – Mumbai.
COMPLETED PROJECT WITH MIVAN FORMWORK:SPHAGETTI at KHARGHAR
Location:
Navi – Mumbai.
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Country:
India.
Client:
CIDCO and L&T ECC
Scope:
4 No. Blocks on each floor of 4, 5, 6, and 7 Storey Apts.
Design:
Load Bearing wall & slab.
Cycle:
4 days per floor.
System formwork:
6000 sq.mt.
Contract Start Date:
November 2003.
Project Type (s):
High rise, residential building having 16 buildings in all.
Architect:
Hafeez contractor.
5.1 DISCUSSION
The building in plan made an angle of 1720, 168º and 1610 with each other. The
quality of construction is maintained at the site with the use of RMC. The RMC plant has
a capacity of producing 90 cubic meter of concrete of concrete per hour. The concrete
used was of 25 grades. The construction from foundation up to stilt is done with
conventional practice while the upper floors are constructed using ‘MIVAN’ technology.
The construction company has imported three sets of aluminium forms. The cost is about
Rs.500/- sq.ft as against Rs.650/- sq.ft using conventional methods. Thus it can be said
that even though the cost of construction is little bit high it has an unmatched quality
compared to the conventional method.
MIVAN formwork played a vital role in the construction of the project. The
project was completed not only on stipulated period of time but also paid off with its
attributes. Speedy & quality dwelling units were provided to the people of low income
groups at very reasonable costs. MIVAN is a definitely future of this ever growing
construction industry with lots of project still awaiting its touch of excellence.
6.1 CONCLUSION:
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The task of housing due to the rising population of the country is becoming
increasingly monumental. In terms of technical capabilities to face this challenge, the
potential is enormous; it only needs to be judiciously exploited.
Civil engineers not only build but also enhance the quality of life. Their creativity
and technical skill help to plan, design, construct and operate the facilities essential to
life. It is important for civil engineers to gain and harness the potent and versatile
construction tools.
Traditionally, construction firms all over the world have been slow to adopt the
innovation and changes. Contractors are a conservative lot. It is the need of time to
analyze the depth of the problem and find effective solutions. MIVAN serves as a cost
effective and efficient tool to solve the problems of the mega housing project all over the
world. MIVAN aims to maximize the use of modern construction techniques and
equipments on its entire project.
We have tried to cover each and every aspect related to aluminium (MIVAN)
form construction. We thus infer that MIVAN form construction is able to provide high
quality construction at unbelievable speed and at reasonable cost. This technology has
great potential for application in India to provide affordable housing to its rising
population.
Thus it can be concluded that quality and speed must be given due consideration
with regards to economy. Good quality construction will never deter to projects speed nor
will it be uneconomical. In fact time consuming repairs and modification due to poor
quality work generally delay the job and cause additional financial impact on the project.
Some experts feel that housing alternatives with low maintenance requirements may be
preferred even if at the slightly may preferred even if at the higher initial cost.
List of figures
Figures
Page
Fig 1.1 Prefabricated Technology…………………………………………….……….9
Fig 1.2 Tunnel Technology……………..…………………………………….……….9
Fig 1.3 Outinard Technology……………………………………………………..….10
Fig 1.4 Mascon Technology………………..……………………………………...…10
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Fig 2.1 Staircase under Traditional formwork arrangement……..…………………..13
Fig 2.2 Typical steel formwork system………………………………………………13
Fig 2.3 Aluminum formwork for wall ……………………………………………….13
Fig 2.4 Precast elements……………………………………………………………...14
Fig 2.5 Hydraulic jack devices………………………………………………………..14
Fig 2.6 VSL formwork………………………………………………….…………….15
Fig 3.1 Wall Panel…………………………………………………………………….25
Fig 3.2 Rocker………………………………………………………………….……..26
Fig 3.3 Kicker…………………………………………………………………………26
Fig 3.4 Stub pin………………………………………………………………………..27
Fig 3.5 Beam side panel……………………………………….………………………27
Fig 3.6 Prop head for soffit beam………………………..……………………………28
Fig 3.7 Beam soffit panel……………………………………..……………………….28
Fig 3.8 Beam soffit bulkhead……………………………….…………………………29
Fig 3.9 Deck Panel………………………………………….…………………………29
Fig 3.10 Deck prop……………………………………………………………………30
Fig 3.11 Deck prop length…………………………………………………………….30
Fig 3.12 Deck mid-beam………………………………………………………………31
Fig 3.13 Soffit length………………………………………………………………….31
Fig 3.14 Deck beam bar……………………………………………………………….32
Fig 3.15 Internal soffit corner………………..………………………………………..32
Fig 3.16 External soffit corner…………………………………………………………33
Fig 3.17 External corner……………………………………………….………………33
Fig 3.18 Internal corner………………………………………………………………..34
Fig 3.19 Wall assembly details…………………………………………………..……35
Fig 3.20 Beam assembly details………………………………………………………36
Fig 3.3.1 Erection of platform………………………………………………………...41
Fig 3.3.2 Striking of formwork……………………………………………………….42
Fig 3.3.3 Positioning of platform………………………………………………….….43
Fig 3.3.4 Removal of kicker…………………………………………………….……44
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List of Tables
Tables
Page
Table 1.1- Total population and percentage of population in unauthorized
construction………………………………………………………………5
Table 1.2- Shortage of housing in India ………………………..……………………6
Table 2.1- Comparison of Aluminium formwork with Conventional type…………..21
Table 3.1- Detailed time schedule for twenty four hours ……………………………46
Table 3.2- Productivity of MIVAN forms in 4 days………………………………....47
Table 3.8.1- Cost of comparison of Conventional & MIVAN……………………….49
Table 3.8.2- Effect of construction speed on the cost of flat………………...……….50
References:
1. Carol., A., “(2001)”. Editor. “Times Journal Construction and Design”. Oct-Dec
2001, pp Editorial.
2. “Census of India”., “(2001)” “Table 500-012”. pp-48.
3. Jain and Jain., “(1993)”. “Design of Formwork”. “Design of Concrete
Structures.”, Edition 1993, pp 595-606.
4. Jana., V., G., & Kagale., Y., P., “(2005)”. “Indegnisation of Mass housing
technology”. “Indian Concrete Journal”, July2005, Volume 79, pp. 41-46.
5. Kulkarni., D., V., “(2001)”. “ First Rate Forms”. “Times Journal Construction and
Design”. Oct-Dec 2001, pp 22-23.
6. “National Building Organization”., “(2001)”. pp-25
7. Raymond., W., W., M., “(2001)”. “Conditions and Constraints in the formwork
systems for the complex High Rise buildings – with cases from HongKong”. July
2001, pp 2-6.
8. Shah., A., B., “(2005)”. “Large panel precast construction for speed and
economics”. “Indian Concrete Journal”, July2005, Volume 79, pp. 47-54.
9. Shah., Ketan., “(2005)”. “ Modular formwork for faster, economical and quality
construction”. “Indian Concrete Journal”, July 2005, Volume 79, pp 22-26.
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10. Telang., S., R., “(2005)”. “ Providing transit shelter to project affected people”.
“Indian Concrete Journal”, July2005, Volume 79, pp. 55-59.
DISCUSSION WITH EMINENT EXPERTS:
1. Mr. Manohar R. Kharache, Executive Engineer, CIDCO.
2. Mr.Vikas Damle, Deputy Manager, ACC-RCD, Thane.
3. Mr. Ankur Jadhav, Site Engineer Spaghetti, L&T ECC.
4. Mr. Naik, Site Engineer Spaghetti, CIDCO.
WEB SITE CONSULTED:
1. AskACC- ( Definition of Formwork)
URL (www.askacc.com)
2. Answers- (Classification of formwork)
URL (www.answers.com)
3. Army Website- ( Prefabricated buildings)
URL (www.army.com)
4. Encyclopedia- (Definition of Formwork)
URL (www.wikipedia.com)
5. OUTINARD- (Components, Assembly)
URL (www.outinard.com)
6. MIVAN- (Components, Assembly, Case studies)
URL (www.mivan.com)
7. MASCON- (Components, Assembly, Case studies)
URL (www.mascon.com)
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