SPECIFICATION 704
CABLE CONDUITS & PITS FOR
INTELLIGENT TRANSPORT SYSTEMS
(ITS)
Copyright MAIN ROADS Western Australia
MAIN ROADS Western Australia
Contract xxx/xx
Specification 704 Cable Conduits/Pits for ITS
Document 04/10125 Issue 20/05/2013
Page 1 of 26
SPECIFICATION 704
CABLE CONDUITS & PITS FOR INTELLIGENT TRANSPORT
SYSTEMS
REVISION REGISTER
Date
Clause
Number
Description of Revision
Authorised
By
20/05/2013
704.02,
704.08 &
704.35
Added AS4586: 2004 and
ANSI/SCTE-77:2010; added
loading requirements for
vault assemblies; added
installation of HDPE pits.
AMTSAMT
S
27/07/ 2011
Clause
704.37
Typo corrected
AMTS
17/12/ 2010
Whole
Document
Revision of several areas
relating to pit materials,
construction, security
features, and installation/
maintenance requirements.
“Pits” included in title
AMTS
11/11/ 09
704.08.10 &
704.35.08
Pit gasket clauses added
TOM
01/08/06
Whole
document
Complete revision of Issue
1.4 to new format
MCP
MAIN ROADS Western Australia
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Specification 704 Cable Conduits/Pits for ITS
Document 04/10125 Issue 20/05/2013
Page 2 of 26
CONTENTS
Clause
Page No
GENERAL ...................................................................................................................... 4
704.01 SCOPE ........................................................................................................... 4
704.02 REFERENCES ............................................................................................... 4
704.03 – 704.05 NOT USED .................................................................................... 4
PRODUCTS AND MATERIALS ..................................................................................... 5
704.06 MATERIALS AND WORKMANSHIP ............................................................... 5
704.07 PROPRIETARY ARTICLES............................................................................ 5
704.08 ITS CABLE PITS ............................................................................................ 5
704.09 ITS CONDUITS ............................................................................................ 14
704.10 ITS PIT LABELLING …………………………………………………………… 14
704.11 – 704.25 NOT USED .................................................................................. 15
INSTALLATION ........................................................................................................... 15
704.26 NOTICES ..................................................................................................... 15
704.27 CONFLICT WITH OTHER BURIED SERVICES ........................................... 15
704.28 PUBLIC SAFETY .......................................................................................... 15
704.29 CLEARING ................................................................................................... 15
704.30 TRENCHING ................................................................................................ 15
704.31 ROAD CROSSINGS ..................................................................................... 16
704.32 ROCK EXCAVATION ................................................................................... 16
704.33 BACKFILL .................................................................................................... 16
704.34 REINSTATEMENT AND CLEAN-UP ............................................................ 16
704.35 ITS CABLE PITS .......................................................................................... 16
704.36 ITS CONDUITS ............................................................................................ 19
704.37 ITS CABLE ROUTE MARKERS & MARKING TAPE ................................... 20
704.38 TESTING OF CONDUITS............................................................................. 21
704.39 – 704.80 NOT USED .................................................................................. 21
AS BUILT AND HANDOVER REQUIREMENTS.......................................................... 21
704.81 AS-BUILT INFORMATION............................................................................ 21
704.82 – 704.90 NOT USED .................................................................................. 21
CONTRACT SPECIFIC REQUIREMENTS................................................................... 22
704.91 – 704.99
NOT USED .................................................................................. 22
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Specification 704 Cable Conduits/Pits for ITS
Document 04/10125 Issue 20/05/2013
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SPECIFICATION 704
CABLE CONDUITS & PITS FOR INTELLIGENT TRANSPORT
SYSTEMS
GENERAL
704.01
SCOPE
1.
The work under this specification consists of the supply and
installation of underground cable, conduits, pits and route markers and
associated equipment for running communications and electrical cables
for Intelligent Transport Systems (ITS).
704.02
REFERENCES
1.
Australian Standards, MAIN ROADS Western Australia
Standards and MAIN ROADS Western Australia Test Methods are
referred to in abbreviated form (e.g. AS 1234, MRS 67-08-43 or WA
123). For convenience, the full titles are given below:
Australian/New Zealand Standards
AS/NZS 2053 Conduits and Fittings for Electrical Installations
AS/NZS 3000 SAA Wiring Rules
AS 3996: 2006 Access covers and grates
AS 4680: 2006 Hot Dipped Galvanizing (Zinc) Coatings
AS4586: 2004 Slip Resistance Classifications of new pedestrian
surface materials
Other Standards
AUSTEL
ANSI/SCTE-77:2010,
Technical Standard 009 Installation
Requirements For Customer Cabling (Wiring
Rules)
Specification for Underground Enclosure
Integrity
MAIN ROADS Specifications
Specification 202
Specification 301
Specification 302
Specification 404
704.03 – 704.05
TRAFFIC
CLEARING
EARTHWORKS
CULVERTS
NOT USED
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Document 04/10125 Issue 20/05/2013
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PRODUCTS AND MATERIALS
704.06
MATERIALS AND WORKMANSHIP
1.
All work relating to cable conduits for electrical purposes as
detailed on the Drawings shall be carried out in accordance with
AS/NZS 3000.
AS/NZS 3000
2.
All work related to conduits for communication purposes as
detailed on the Drawings shall be carried out in accordance with
Australian Communications Authority regulations.
ACA
Regulations
3.
The requirements of the power supply authority and the
telecommunication authority and any other body or bodies having
jurisdiction over such works in Western Australia, and the further
requirements of this Specification, shall also be satisfied.
Authorities
4.
Where any apparent discrepancy or contradiction occurs
between this Specification and the aforementioned Standards and
Regulations, this Specification shall take precedence.
Precedence
704.07
PROPRIETARY ARTICLES
1.
Where any proprietary article is mentioned in these
documents sole preference to any named material or equipment is not
intended.
Preference
2.
The Contractor shall submit to the Superintendent details of
material or equipment where they are different to that which is specified.
The characteristics of type, quality, appearance, finish, method of
construction and or performance shall not be less than that specified,
and the Contractor shall demonstrate conformance to the requirements
of the Specification and the Drawings. The Contractor shall allow up to
14 days for assessment of the proposal.
Substitution
and
Conformance
3.
Prior to the purchase of alternative material or equipment,
the Contractor shall obtain the Superintendent’s written approval.
HOLD POINT
704.08
ITS CABLE PITS
1.
Cable pits shall be made of precast concrete, glass
reinforced polyester (GRP) resin, or High Density Polyethylene (HDPE)
unsupported and structurally tested, certified and badged for the
required loading. (See also Section 704.08, Item 4). They shall be fitted
with heavy duty, well fitting, metal or Composite Resin Fill (CRF),
lockable (by padlocks) lids, AS 3996 certified and badged Class B 80
kN.
Cable Pit
Type
2.
The cable pit type used shall consider the intended
application. Where pits are to be installed over existing conduits with
optical fibre already installed, or over ‘blown fibre’ tubes where the
integrity of (some) fibre runs needs to be maintained, the installed pits
shall be of a separable or segmented construction to facilitate this
Pit
Application
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Document 04/10125 Issue 20/05/2013
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requirement, thus not affecting the structural integrity of the cable pit.
3.
The locking mechanism may reside in the lid, in a separate
lid section, or can be incorporated in the pit structure. The securing
mechanism for the lid (to the pit) shall directly engage the outside edges
of the lid with the side of the pit, or with the side of a separately secured
lid section. A securing mechanism that does not directly lock down or
latch at least two opposing sides of the lid shall not be deemed to meet
these requirements.
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Document 04/10125 Issue 20/05/2013
Pit Locking
Page 6 of 26
4.
As a minimum requirement, the pit and lid tested as a
completed assembly shall withstand a loading of at least 80 kN
conforming to the Class B rating specified in AS 3996: 2006, Table 3.1.
and tested in the following configurations:
Table 1: Load testing details and requirements
Test sequence
Test
Configuration
Vertical Centre
Load
Sidewall
Vertical Load
Sidewall
Lateral
Pressure test
5 applications of 53
kN applied at a
rate not to exceed
5 kN per minute
followed by 1
application of 80
kN at a rate not to
exceed 5 kN per
minute in free air.
5 applications of 53
kN applied at a
rate not to exceed
5 kN per minute
followed by 1
application of 80
kN at a rate not to
exceed 5 kN per
minute in free air.
5 applications of 10
kN applied at a
rate not to exceed
5 kN per minute in
free air followed by
a single application
of 15 kN load.
Pit & Lid
Loadings
Requirements
Load applied to the
geometric centre of
the product
assembly by a 240
mm by 240 mm
steel load
application plate
with 25 mm soft
plywood layer
between product
and plate.
The lid shall not
deflect more than
CO/45 on the first 53
kN load application
and have no more
than CO/100
permanent
deflection after the
fifth load application.
Load applied to the
centre of the
product assembly
sidewall with the
longest axis by a
240 mm by 240
mm steel load
application plate
with 25 mm soft
plywood layer
between product
and plate such that
half of the plate is
engaged with the
vault lid, or 120mm
by 240mm loading
plate engagement.
The load shall be
applied in the
geometric centre of
the engaged
portion of the load
application plate.
The lid shall not
deflect more that
CO/45 on the first 53
kN load application
and have no more
than CO/100
permanent
deflection after the
fifth load application.
Load is applied
laterally to the
longest sidewall by
a steel plate 460
mm by 915 mm
bearing against a
soft medium such
as sand to ensure
uniform pressure to
the sidewall.
The maximum
deflection of the
vault wall shall not
exceed 2.2 mm per
100 mm of average
sidewall length at
10kN.The assembly
shall not have
structural damage
after the 15 kN load.
There shall be no
structural damage of
any part of the
assembly after the
last application of 80
kN load.
There shall be no
structural damage of
any part of the
assembly after the
last application of 80
kN load.
Higher ratings may need to be specified based on the pit location, and
the likelihood of larger and heavier vehicles being driven over the pit.
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AS3996: 2006 includes ratings of up to 900 kN loading for Class G. To
meet the loading requirements, it is expected that the top of the pit
would be strengthened, as part of the design, either with an increased
material width (nominally 125mm) surrounding the lid, or by a reinforcing
frame. Given that the lid loadings are transferred to the pits, the design,
construction (mode and material), manufacture and installation of the
pits shall be such that they can accommodate the specified forces
without damage or distortion.
CO used above refers to the Circular Opening of the pit and is defined in
AS/NZ 3996-2006, Paragraph 1.1.4 and shown in Figure 1.1 of the
specification.
The following procedures and test methods shall be used to perform the test sequences
noted above:
Vertical Centre Load
A 240 mm x 240 mm x 25.4 mm steel plate will be placed on a 240 mm x 240 mm x 25.
4 mm soft plywood layer and be located at the centre of the enclosure lid, oriented as
indicated in Figure 1. The full magnitude of the cyclic load will be applied over the
centre of the plate for 5 seconds and then removed. The loading and unloading rate
shall not exceed 5 kN per minute. This cycle is repeated 4 more times, after which the
final (maximum) load is applied for 10 seconds and then removed.
Figure 1 – Vertical Centre Load test configuration
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Sidewall Vertical Load
A 240 mm x 240 mm x 25.4 mm steel plate will be placed on a 240 mm x
240 mm x 25. 4 mm soft plywood layer and be located at the geometric
centre of the longest axis of the vault such that half of the plate is
engaged with the pit lid and the other half overhangs the pit lid, or
120mm by 240mm loading plate engagement with the lid as shown in
Figure 2. The full magnitude of the cyclic load will be applied over the
centre of the engaged portion of the plate for 5 seconds and then
removed. The loading and unloading rate shall not exceed 5 kN per
minute. This cycle is repeated 4 more times, after which the final
(maximum) load is applied for 10 seconds and then removed.
Figure 2 – Sidewall Vertical Load Test Configuration
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Document 04/10125 Issue 20/05/2013
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Table 2: Application Chart
Application
Reference
Specification
Spec.
Level
Load
Requirement
Loading
Plate
Loading
Level
Cyclic
Ultimate
Load
Requirements
Pedestrian/
Light Traffic
AS 3996-2006
Class
B
Vertical
Centre Load,
240 mm
by 240
mm steel
plate
with
25mm
plywood
interface
layer
5x
53kN
80 kN
Max
deflection
after first
Cyclic load :
CO/100
Sidewall
Vertical Load
Areas
accessible to
noncommercial
vehicles,
including
footways and
light tractor
pathways.
Max
permanent
deflection
after last
Cyclic load =
CO/45.
No structural
damage after
Ultimate Load
Medium
Duty/Slow
Traffic in
Road
AS 3996-2006
Areas
accessible to
slow moving
commercial
vehicles
Class
C
Vertical
Centre of Lid
- Lid and
frame only
240 mm
by 240
mm steel
plate
with
25mm
plywood
interface
layer
5 x 100
kN
150 kN
Max
deflection
after first
Cyclic load :
CO/100
Max
permanent
deflection
after last
Cyclic load =
CO/45
No structural
damage after
Ultimate Load
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Document 04/10125 Issue 20/05/2013
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Heavy Duty
Traffic in
Road
AS 3996-2006
Class
D
Vertical
Centre of Lid
- Lid only
Carriageway
s and roads
open to
commercial
vehicles
240 mm
by 240
mm steel
plate
with
25mm
plywood
interface
layer
5x
167kN
250 kN
Max
deflection
after first
Cyclic load :
CO/100
Max
permanent
deflection
after last
Cyclic load =
CO/45
No structural
damage after
Ultimate Load
5.
Alternative materials for the pit and lid can be approved by
the Contract Superintendent/Manager in consultation with the Asset
Manager Traffic Systems. Consideration of these alternatives may be
based on the following factors:
Materials
a) Chemical and biological inertness
b) Low fluid absorption
c) Durability, and resistance to weathering and ultra-violet
radiation (UV)
d) Structural properties – load bearing capacity and resistance to
distortion.
e) Hardness – ability to be cut and drilled with masonry tools
f) Thermal performance (at high and low temperatures)
g) Electrical conductivity and dielectric properties
h) Weight (in any case, lifting equipment commensurate with the
weight should be used for handling)
The use of alternative materials shall take into consideration the site
(soil) conditions, and specified loading requirements. Typical
alternatives could include HDPE and/or composite materials such as
glass reinforced polyester resin (GRP).
5.1
Pit lids shall have a Slip Classification of “W” when tested
according to the Wet Pendulum test or “B” when tested according to the
Wet Barefoot requirements as described in the AS 4586:2004
specification.
6.
Pre-formed pits shall be designed and manufactured to suit
the intended use. Prior to acceptance by Main Roads, documentation
shall be supplied outlining the structural design, and the material(s)
used in the product. This documentation shall include (but not be limited
to) structural calculations, specifications, certified test results to verify
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Approvals/
Documentation
Page 11 of 26
product performance and longevity. Information should also be supplied
on specific installation requirements to ensure optimum product
performance.
7.
The manufacturer and/or supplier shall include instructions
for initial and periodic maintenance (as necessary) for the pits, lid and
locking mechanism. The requirement (or availability) of any special tools
shall be included.
Instructions/
Maintenance
8.
Generally the nominal pit sizes to be used are MRW4,
MRW5, MRW7, MRW8, MRW10, MRW11 as outlined as follows:
Pit Sizes
Table 3: Nominal Pit Sizes
Nominal Internal
Dimensions - mm
Product
Model
Length
Width
Depth
MRW4
550
250
600
MRW5
600
300
600
MRW6
600
350
800
MRW7
900
450
800
MRW8
1200
500
900
MRW10
1800
500
900
The sizes tabulated are the nominal minimum internal dimensions of the
listed pits. As a guide, the project supervisor may approve the use of a
pit that may have some dimensions smaller than the specified nominal
size, by no more than 25 mm.
Vault extensions might be required when added depth is required.
Extensions, when used, must be secured onto the bottom of the pit.
9.
For the MRW concrete pits, two drainage holes of
nominal 20-25mm diameter shall be provided in the base of each cable
pit, located approximately 100mm from each end on the central long
axis. The MRW HPDE pits are to have a clearance between the floor
and the sidewalls of the pit that allow the drainage of water.
Drainage
Holes
10 .
Where the use of High-Density Polyethylene (HDPE) pits has
been approved, the product would be subject to meeting structural
requirements that will depend on soil conditions and preparation
associated with installation.
HDPE Pit
Structural
Requirement
11 .
When the MRW concrete pits are used, a plinth shall be
constructed in accordance with Drawing 200531-0003 and shall have a
minimum 28 day compressive concrete strength of 40 MPa. When using
the MRW HDPE pits configured with composite resin fill (CRF) lids, a
composite raising ring, of integral construction, may be used in lieu of a
HDPE and
Concrete Pits
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separate concrete surround. The ring must be secured to the top of the
pit. The pit, ring, and lid as an assembly shall carry the required loads
as detailed in the Application Chart of 704.08.4 above. There may still
be a project specific requirement to install pits with concrete surrounds,
or within a concrete pad or paved area. This requirement should be
confirmed by the project manager.
12.
Unless otherwise specified, Pit Lids must be Badged and
fully Certified to AS 3996: 2006. Pit Lids shall be pad-lockable type, 4 to
5mm tread patterned, hot dipped galvanised steel to AS 4680: 2006.
Composite Resin Fill lids shall meet AS4586:2004 Slip resistance
standards with a ‘W’ Wet pendulum and/or ‘B’ Wet Barefoot
classification. If the locking mechanism resides in the lid, the lock shall
be recessed in a chamber hidden behind a steel panel of similar
material to the lid. All metal components of the lid, pit and locking
mechanism shall be hot dipped galvanised steel (to AS 4680: 2006) or
marine grade stainless steel.
Pit Lids (Steel)
13.
Alternative pit lid material and construction may be approved
by the Project Superintendent/Manager in consultation with the Asset
Manager Traffic Systems. Such alternatives could include Composite
Resin Fill, HDPE, or separate lid sections, such as a combination of a
(AS 4680: 2006) galvanised steel lid with a concrete filled galvanised
steel/ aluminium tray lid, provided that the loading, construction/
performance and locking requirements of this specification are met. All
lids shall be lockable with either a recessed padlock, as discussed in
paragraph 15 above, for high security, or a captured L bolt lock for
medium security applications.
Pit Lid
Alternatives
14.
For pit lids (including lids incorporating the locking
mechanism), the lid surface shall have no hole larger than 6mm
diameter with the locking chamber closed. Alternative lifting methods
such as magnets may be used in place of lifting holes to access the
locking chamber under a spring loaded cover. The locking mechanism
cover plate shall not be secured by screws. All lids shall allow for safe
and practical lifting. Requirement for special tools (if any) should be
identified.
No lifting Hole
15.
The pit locking mechanism, whether located in the pit or the
lid, shall be supplied and fitted with a type 234 Yale brass padlock with
stainless steel shackles, and must utilise the Main Roads secure
(restricted copy) locking system. Details of the locking system should be
obtained from the Project Superintendent /Manager.
Padlocks (Pit
locking)
16.
Pit gaskets are to be installed for sealing and prevention of
sharps and other hazardous material from being inserted into the pit.
Gaskets shall be secured to the lids in such a way that they remain with
the lid upon removal of the lid from the pit. As an alternative, MRW pits
may have containment receivers on all open holes, making the use of
gaskets unnecessary.
Pit Gaskets
17.
Suppliers of MRW pits, covers, raising rings, and accessories
shall issue a warranty for the installed pit assembly for a period of seven
years from the time of purchase, against damage due to normal use in
field installations assuming the following conditions:
Warranty
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17.1
Pit components and assembly are certified by an
independent test laboratory for performance to the requirements of
this specification.
17.2
Component selection of the pit assembly must be in
compliance with the manufacturers recommended practice and
application chart of this specification. Field deployment of MRW
pits must comply with Mainroads design requirements and specific
in-field criteria.
17.3
Installation of the pit assembly is completed according
to the installation instructions contained in this specification.
17.4
Product is used as designed for the application..
Product abuse or misapplication is not covered.
17.5
If pit product or pit component becomes damaged
within the warranty period, the component will be replaced free of
charge to Mainroads. The warranty expressly does not include
labour or travel costs associated with pit or pit component
replacement. Freight costs to transport replacement items to
Mainroads will be the responsibility of the manufacturer.
704.09
ITS CONDUITS
1.
All conduits shall comply with the requirements of
AS/NZS 2053.
AS/NZS 2053
2.
All rigid UPVC electrical conduits shall be of 100mm
diameter, heavy duty, compliant for underground use and shall be
orange in colour.
Orange
Conduit
3.
All rigid UPVC communication conduits shall be of 100mm
diameter, heavy duty and comply with AUSTEL Technical Specification
TS 009, compliant for underground use and shall be white in colour.
Conduits for the main ‘backbone’ shall be 100 mm diameter but may be
reduced to 50mm diameter for branch connections to nodes and field
devices such as controllers and CCTV.
White
Conduit
4.
Only rigid UPVC conduit fittings shall be used and all joints
cemented using the manufacturer’s recommended adhesive.
Cemented
Joints
5.
Where a thread is required on a conduit, a suitable adaptor
shall be cemented to the conduit.
Threads
704.10
ITS PIT LABELLING
1.
ITS pit markers shall be fixed to the plinth surround of the
cable pit with four brass or stainless steel countersunk screws and a
suitable outdoor adhesive. The Pit Marker shall have the pit number
engraved onto the plate in accordance with Main Roads Drawing
200431 -0080. Where there is no separate plinth fitted, the label should
be attached, as above, to the upper surface of the pit side, otherwise
with the approval of the Project Superintendent/Manager, to the pit lid.
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Pit Label
Page 14 of 26
704.11 – 704.25
NOT USED
INSTALLATION
704.26
NOTICES
1.
The Contractor shall lodge all notices required by the power
supply authority and any other authority having jurisdiction over the
installation and pay any fees required.
704.27
Notices and
Fees
CONFLICT WITH OTHER BURIED SERVICES
1.
Prior to commencing any work, the Contractor shall certify to
the Superintendent that all underground utilities have been identified,
located and all necessary approvals from relevant service authorities
have been obtained.
HOLD POINT
2.
For Drainage pipes and other services shown on the
drawings, in close proximity to conduit routes, manual excavation may
be necessary.
Manual
Excavation
704.28
PUBLIC SAFETY
1.
The Contractor shall progress the works such that the length
of open trench is kept to a minimum. No open trenches shall be left
unattended, and shall be filled and compacted at the end of each day.
Open Trench
2.
Where necessary, control of traffic including pedestrians and
cyclists shall be undertaken by the Contractor in accordance with
Specification 202 TRAFFIC and any appropriate and relevant Australian
Standards applicable to Traffic Management.
Traffic Control
704.29
CLEARING
1.
Clearing shall be undertaken in accordance with
Specification 301 CLEARING.
704.30
Clearing
TRENCHING
1.
The base of trenches shall be free of debris, stones and
sharp objects.
Debris
2.
Excavations in proximity to paved areas shall be suitably
shored to prevent the sides of the excavation from collapsing. Paved
areas shall not be undermined by excavations from work under the
Contracts. Any damage caused shall be treated as a NonConformance.
Shoring
3.
Where trenching is shared with a telecommunications
carrier, the location of the shared trench with its associated pits and
services shall be clearly identified. Details of requirements and
responsibilities would be covered by an appropriate shared trenching
agreement between Main Roads WA and the telecommunications
carrier(s). The communications infrastructures should meet the agreed
Shared
Trenching
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requirements. Shared trenching arrangements may be negotiated with
the Contract Superintendent/Manager in consultation with the Asset
Manager Traffic Systems. Agreements would be signed by Main Roads
at executive level.
704.31
ROAD CROSSINGS
1.
New road crossings for the cable conduits shall be installed
at the locations shown on the Drawings. The work shall include
installation of bored sleeves
704.32
ROCK EXCAVATION
1.
Trench excavation in rock shall be carried out in accordance
with Specification 302 EARTHWORKS.
704.33
Locations
Rock
Excavation
BACKFILL
1.
Excavations not in paths or roadway shall be backfilled and
compacted to match the surrounding soil density and graded to match
surrounding surface level. The top 100mm layer above the top of the
conduits shall be top soil to match existing surrounding material. Where
there is insufficient viable top soil available on site, suitable material
may be sourced elsewhere.
Compaction
2.
Prior to backfilling any trenches, the Contractor shall certify
that the conduits have been installed in accordance with the Contract
and ‘As Built’ records of the location of the conduits have the
Superintendent’s approval.
HOLD POINT
3.
Backfilling and compaction under paths or roadways shall be
done in accordance with Specification 404 CULVERTS.
704.34
REINSTATEMENT AND CLEAN-UP
1.
Pavement surfaces, including concrete or brick paved areas
and pathways, shall be reinstated to the satisfaction of the
Superintendent.
704.35
Surface
Reinstatement
ITS CABLE PITS
704.35.01 GENERAL
1.
The maximum distance between cable pits shall be 250
metres. Every fourth pit (i.e. pits at approximately 1000 metre intervals)
shall be a large MRW8 size to allow for the coiling of additional cable.
These distances are applicable for optical fibre cable drawn in conduit.
2.
Where ‘blown fibre’ is installed the distance between pits
may be extended to a nominal 500 metres, coinciding with vehicle
detector locations, where applicable. Pit spacing for ‘blown fibre’ may
extend beyond this to a nominal 750 metres where there is no
requirement for field devices within this spacing. Pit sizes will normally
depend on project specific requirements. With the pits often coinciding
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‘Blown Fibre’
Pits
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with device locations, and the reduced need for intermediate ‘drawing’
pits, the MRW8 size would normally be required. Some MRW10 pits at
specific locations may also be required.
3.
Cable pits shall not be installed in locations subject to
vehicular traffic. The pits should, however, be within 10 metres of a
location where a splicing van can be safely parked.
Vehicular
Traffic
4.
All foreign material including sand and dirt shall be removed
from the pit after installation.
Foreign
Material
5.
All pits shall have a minimum depth of no less than 800mm
below the finished ground surface level.
Depth
6.
The top of each pit shall be installed to the horizontal plane
across each axis (except as required by Items 7 and 8 below).
7.
In non-paved areas, the top of each pit shall be above the
design surface level or natural level by 50mm +/- 10mm with the
localised soil within 1 metre graded up to the top of the pit.
Non-Trafficable
Areas
8.
When installed in paved areas, pit lids shall be at the same
level as the surrounding pavement surface and positioned flush with the
surrounding pavement surface to avoid the edge becoming a tripping
hazard.
Paved Areas
9.
The pit gasket shall be installed directly under the lid and
rest on the pit lip. When a pit containment receiver is used in the lifting
holes, no gasket is required.
Pit Gasket
10.
Pits shall be positioned with the largest dimension running
parallel to a reference line, such as a path, boundary, kerb line or
conduit run.
Orientation
11.
Pit location should take into consideration other utilities and
services. It should not be located over other services without the written
approval of the relevant authority.
Other Utilities
12.
Generally, pit location should take into consideration
serviceability and access requirements. Pits should be placed where
they can adequately be accessed by maintenance personnel. They
should not be placed where they create a hazard either for personnel
accessing/servicing the pit, or others.
Maintainability/
Hazard
Avoidance
704.35.02 HDPE PITS
1.
MRW HDPE pits may be installed by opening the ground to
proper dimensions and placing a foundation of crushed rock in the
bottom of the hole, placing the pit assembly with a floor on the crushed
rock, backfilling and tamping the soil as detailed as following:
1.1
The perimeter of excavation should be approximately
300mm to 400mm longer and wider than external dimensions of
MRW pit whilst depth should be approximately 75mm to 125mm
deeper than the depth of MRW pit being
installed.
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HDPE Pit
Installation
Pit Excavation
Page 17 of 26
Excavate the site using hand or mechanical methods ensuring that
the bottom of the excavation is level and conforms with general
slope of ground level.
1.2
Bed the MRW pit on layer of fine crushed rock (20mm
or less) to a depth of 75mm to 125mm to prevent subsidence and
assist drainage. The rock shall be free of soil and organic material.
Alternatively a dry mix of cement and crushed rock in a ratio of
1:10 may be used where higher lateral loads are anticipated.
Preparing Pit
Foundation
In circumstances where other services are located underneath the
MRW ® pit, place approved mechanical protection below
foundation covering complete base area of the pit.
1.3
MRW pit cover and floor should be installed and
secured on body prior to placing pit into position and/or backfilling.
Placing Pit in
Excavation
Place the assembled pit into the excavation using appropriate
handling method or aid. Once pit and lid are placed in position
adjust the height and top of the pit so that it is level with
surrounding footway/driveway or ground surface.
Centre the pit in the excavation in line with the conduit entries and
parallel to the edge of the footway or driveway paving.
1.4
Ensure top of the pit is as per final ground level and
allow for the correct depth of footway or driveway to the edge of
the pit.
Backfilling
a)
b)
c)
d)
Discard rocks larger than 40mm from the backfill material.
Match level and surface grade to surrounding area.
Remove excess excavated material from the site.
Backfill around the pit using the finer excavated material in
200mm deep layers tamping each layer either by hand or
using a mechanical tamper.
e) Ensure backfill flows into MRW pit rib pockets to secure pit
into position.
Installed pit is as follows:
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Figure 3 – Installed HDPE pit.
704.36
ITS CONDUITS
1.
All conduits shall be installed at a depth not less than
500mm below the finished ground surface level.
Installation &
Location
2.
The bottom of cable conduits entering cable pits shall enter
at a distance of no less than 100mm from the bottom of the cable pit.
(See Drawing 200531-003.)
Conduit Entry
3.
The bottom of cable conduits entering cable pits shall enter
at a distance of no greater than 780mm from the top of the cable pit.
(See Drawing 200531-003.)
4.
Conduits shall be located not less than 2 metres behind the
kerb line or shoulder where applicable except where shown on the
drawings.
Distance from
Kerb line
5.
The conduits shall be, as far as practicable, in a direct line
between pits.
Conduit
Alignment
6.
The separate conduits, such as for communications and
power, as installed under this Contract, shall remain segregated and not
cross over. For example, if the power conduit is on the side closest to
the carriageway, it shall remain this way, and the corresponding pits
shall also be the closest to the carriageway.
7.
Notwithstanding the other clauses of this Contract, the
conduit may, after receiving the Superintendent’s Approval, be placed
on a radial alignment, to avoid subterranean obstructions, with a
minimum radius of 50 m
8.
Where the conduits enter the cable pits, a clearance hole
(-0 +5mm) to suit the conduit size shall be cut in the pit (or panel insert)
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Clearance Hole
Page 19 of 26
using a hole cutter or similar tool. Pits with holes knocked in with a
hammer or similar tool shall be rejected. Only one hole for each conduit
entering the box shall be cut. Pits designed with rectangular block-outs
for the use of HDPE/PVS panel insets can be utilised provided conduit
entries are in accordance with this clause and the panel is firmly sealed
to the block-out edges.
9.
The conduit shall be sealed to the pit with Silastic or similar
approved sealant.
Sealing
10.
A bell-mouth shall be fitted to the end of each conduit within
the cable pit.
Bell Mouth
11.
Approved under road boring techniques shall be used for
road crossings under existing road pavement and railway reserves.
Trenching methods are not allowed.
Road
Crossings
12.
Seven (7) days prior to any boring activity, the Contractor
shall submit the proposed boring methodology, plant and equipment, the
extent of the site preparations required to undertake the works and the
procedures that shall be followed to install conduits to line and level to
the Superintendent for approval.
Boring
Notification
13.
A 3-core polyethylene or polypropylene rope, with 5.0 mm
nominal diameter and blue/ yellow in colour, shall be installed in each
conduit and suitably anchored at each end.
Draw Rope
14.
Conduits to be installed in existing ducts under the roadway
shall be capped at each end prior to installation to prevent foreign
material entering the conduit. Special care shall be taken at all times to
ensure that all conduits are free of foreign material.
Conduits to be
Kept Clear
15.
Conduits with foreign material inside shall be deemed to be
non-conforming until all foreign material is fully removed or a
replacement conduit is installed.
NonConforming
Conduits
16.
Conduit entry and exit points for the optical fibre shall be
parallel with the long axis of the pits (at opposite ends). Side entry to
pits or entry of conduits at right angles is not allowed. Large radius
‘sweeping bends’ shall be used in lieu of right angle entry/exit conduits.
Conduit Entries
704.37
ITS CABLE ROUTE MARKERS & MARKING TAPE
1.
The location of all underground conduits shall be indicated
by cable markers mounted on posts 1000mm above ground to top of
sign. A post / bollard bearing the cable route marker shall be located at
each cable pit, and placed between the cable pit and direction of
possible traffic encroachment, within several metres of cable pit. Posts
shall be concreted to ensure stable footing.
Post Mounted
Cable Route
Markers
2.
The ITS cable route marker shall be adhesively attached to
a post or bollard in accordance with Main Roads Drawing Number
200431-0080.
3.
Each marker shall be inscribed with the telephone number
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“(08) 9323 4848” and “Dial before you dig” number “1100”.
4.
The Post or Bollard shall be of durable materials of ultra
violet resistant heavy-duty plastic, aluminium or galvanised steel.
Post/Bollard
5.
Where a metal bollard is used, it shall be a 76 x 38 x 2 RHS,
1300mm long and finished in Matt Golden Yellow Y14 in accordance
with AS 1743, with a yellow cap inserted into the top of the post or
bollard.
6.
Where longitudinal spacing allows, markers shall be placed
close to fences or other fixed structures to avoid damage by
maintenance or other vehicles. 300mm of post shall be buried in ground
leaving 1000mm above ground. Posts shall be concreted to ensure
stable footing.
Placement
7.
vehicles.
Obstruction of
Access
Markers shall not obstruct access for pedestrians, cyclists or
8.
Communications Marking Tape (continuously labelled for
Communications), or nominal 150mm width, shall be laid in the trench
300 mm above the ITS Communications conduit by the contractor,
together with tracer wire, for the entire route. The Marking Tape shall
comply with the Australian/New Zealand Standard AS/NZS
2648.1:1995.
704.38
TESTING OF CONDUITS
1.
The Contractor shall test conduits after trenches have been
filled and pits installed. The test shall be undertaken by drawing a test
mandrel through the conduit. The test mandrel shall be 240mm long
and 90% of the nominal internal diameter of the conduit. Conduit failing
the testing shall be made good by the Contractor.
704.39 – 704.80
NOT USED
AS BUILT AND HANDOVER REQUIREMENTS
704.81
AS-BUILT INFORMATION
1.
The Contractor shall supply “As Built” drawings conforming
to “MAIN ROADS WESTERN AUSTRALIA – AUTOCAD DRAWING
STANDARDS”.
As-Built
Drawings
2.
The Contractor shall make an accurate record of all changes
where the actual installation differs from that shown in the contract
drawings and specification.
3.
Drawings shall be supplied in hard copy and electronic
format (AUTOCAD 2004).
704.82 – 704.90
NOT USED
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CONTRACT SPECIFIC REQUIREMENTS
704.91 – 704.99
NOT USED
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SPECIFICATION 704 GUIDANCE NOTES
DELETE THESE GUIDANCE NOTES FROM FINAL DOCUMENT AFTER USING FOR
REFERENCE
All edits to downloaded TDP documents shall be tracked (most word processing
software allows this to be done automatically). Deletions shall be struck through e.g.
example. Insertions shall be in italics e.g. example. If all information relating to a clause
is deleted then the clause number should be retained and the words "NOT USED"
should be inserted.
The proposed documents with tracked changes shall be submitted to the Project
Manager for review, prior to printing the final batch of documents. When this final
printing is carried out, the tracked changes option is to be turned off.
The Custodian of this specification is the Asset Manager Traffic Systems.
1.
SIZE AND NUMBER OF CONDUITS
Each project will need discussion with the Asset Manager Traffic Systems to determine
the size and number of conduits to be installed.
2.
ROAD CROSSINGS
2.1
Author.
The location, number and type of road crossings to be confirmed by the
3.
AND
DESIGN CONSIDERATIONS – CONFIGURATION OF ITS CONDUITS
CABLE PITS
3.1
Conduits shall be run to enable cables to be 'drawn-in' after installation, with
sufficient accessible cable pits to be used for this purpose.
3.2.
A single 100mm diameter white conduit for fibre optic telecommunication
cable and a single 100mm diameter orange conduit for electrical power cable, shall be
installed below ground in a straight line between cable pits, along the cable route, in the
configuration shown in Main Roads Drawing Number 200431-0081-1. Alternative
configurations and arrangements, as with the use of ‘brown fibre’ may be approved by
the Project Superintendent/Manager in consultation with the Asset Manager Traffic
Systems.
3.3.
Except where shown on the drawings, cable pits for each of the conduits
shall be located at intervals to allow for hauling of the cable and connection to terminal
equipment.
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3.4.
Existing road crossings for cable conduits are at locations and at depths
below the pavement as shown on the drawings. The crossings consist of one or more
300mm concrete pipes extending 1 metre either side of the roadway. Heavy-duty
underground conduits shall be used to segregate cables through the concrete pipes.
3.5.
Cable pits shall be provided at the following specific locations:
a) Each side of under road crossings.
b) Nominated locations as shown on the drawings.
c) Changes in direction of conduit alignment of more than ten degrees.
d) Interfaces between different types of cable routes.
e) Every 250 metres or less (except for blown fibre installations where the
spacing may be between 500metres and 750 metres depending on
device connection requirements).
3.6.
One MRW8 cable-jointing pit shall be located at every fourth pit location.
One MRW8 cable-jointing pit shall be located at each side of under-road crossings. All
other pits shall be MRW4 cable hauling pits. Except where shown on the drawings, the
cable pits for each conduit route shall be located adjacent to each other, a minimum of 2
metres apart longitudinally, and offset to allow the other conduit route to pass. (See
Main Roads Drawing Number 200431-0081-1.) The intention of this requirement is to
allow the conduits to be laid side by side in the trench whilst ensuring that the two types
of cable are completely segregated.
3.7.
Where the work involves the relocation of existing ITS conduits, the use of
MRW7 type pits in lieu of MRW8 pits may be specified to allow the re-use of pits and/or
lids if this is an option.
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CONTRACT SPECIFIC REQUIREMENTS TO ADD OR DELETE
The following clauses are to be placed under the CONTRACT SPECIFIC
REQUIREMENTS as required.
NONE AT THIS TIME.
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SPECIFICATION AMENDMENT CHECKLIST
Specification Name: No: 704 Revision No: ____Title: CABLE CONDUITS FOR ITS
Project Manager: Name:
_____________Signature: ___________Date:________
Checked By: Name: _______________Signature: ______________Date:________
Contract No: ______Contract Description: ________________________________
ITEM
DESCRIPTION
SIGN
OFF
All changes/amendments must be shown in Tracked Change mode until
Note:
approved.
1.
Project Manager has reviewed Specification and identified
Additions and Amendments.
CONTRACT SPECIFIC REQUIREMENTS addressed? –
2.
Contract specific materials/products/clauses added? (Refer
Specification Guidance Notes for guidance).
3.
Any unlisted Materials/Products proposed and approved by the
Project Manager? – if “Yes” provide details at 15.
Standard Clauses amended? – MUST SEEK approval from
4.
MCP.
5.
Clause deletions shown as ‘NOT USED’.
Appropriate INSPECTION & TESTING parameters included in
6.
Spec 201 (Test Methods, Minimum Testing Frequencies
verified).
ANNEXURES completed (Refer Specification Guidance Notes).
7.
HANDOVER and AS BUILT requirements addressed.
8.
Main Roads QS has approved changes to SMM.
9.
10.
Project Manager certifies completed Specification reflects intent
of the design.
11.
Completed Specification – independent verification arranged by
Project Manager
12.
Project Manager’s review completed.
SPECIFICATION GUIDANCE NOTES deleted.
13.
TABLE OF CONTENTS updated.
14.
15
Supporting information prepared and submitted to Project
Manager.
Further action necessary:
Signed:
MAIN ROADS Western Australia
Contract xxx/xx
(Project Manager)
Date: _______________
Specification 704 Cable Conduits/Pits for ITS
Document 04/10125 Issue 20/05/2013
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