Strand Jacks
Jack Assembly
Jack
Jack support beam
Multi-strand cable
Fixed anchor & housing
Very heavy load
Strand Jacks
Jack Components
Jack
Jack (top) anchor
Jack support beam
Centre hole jack
Multi-strand cable
Fixed anchor & housing
Main (bottom) anchor
Very heavy load
Jack support beam
Multi-strand cable
Strand Jacks
Jack (top) anchor
Wedges
Conical holes
Centre hole jack
Mini jacks
Strand Jacks
Centre hole jack
Conical
holes
Main (bottom)
anchor
Wedges
Mini jacks
Jack support
beam
Strand Jacks
Jack Components
Jack
Jack (top) anchor
Jack support beam
Centre hole jack
Multi-strand cable
Fixed anchor & housing
Main (bottom) anchor
Very heavy load
Jack support beam
Multi-strand cable
Strand Jacks - Range
Jack model
Number of Strands
Capacity (tonnes)
Stroke (mm)
L15 mk. 1
1
15
250
L15 mk. 2
1
15
450
L50
3
15
450
L100
7
105
300
L180
12
180
500
L300
19
29
450
L450
27
405
450
L600
37
555
450
L750
50
750
450
Strand Jacks - Strand
Vitally important to strand jacks are the strands. These are 18mm diameter and
are formed from seven wires. The seven wires are wound together to form a
helix. After winding they are drawn through a die to compact and harden them.
The resulting strand has a guaranteed ultimate tensile strength of 38 tonnes and
a factor of safety of 2.5 is normally applied to this to give the safe working load of
15 tonnes. Other factors of safety have been used from 2.0 (short term load
during a pulling operation) to 9.0 (inside a nuclear containment area) but 2.5 has
been adopted as the industry norm.
Strand Jacks – Power Packs
Power packs provide the oil to the jacks and can be powered by diesel engine or
electric motor.
All power packs have direct, panel mounted, monitoring and control systems.
Further electronic monitoring can display number of lift strokes completed and
individual stoke positions at each jack.
Similar control and monitoring facilities can also be positioned remote from the
power pack to fully computerised systems, including automatic lifting and
lowering capabilities.
Maximum pumping pressure, hence jack lifting force, can be pre-set or altered at
will by pressure control valves on the panel.
Strand Jacks – Remote Control
Remote control:
The control system is a PC operated
system to operate up to 20 jacks with
total synchronisation.
The system features are:
•Lift and load sensitive detection
•Overload detection
•Lift counting
•Adjustable equalisation of jack strokes
during operation
Strand Jacks –Advantages
•
Comprehensive, completely automatic,
remote control and monitoring where
required;
•
Extremely precise adjustment of the lift
for setting of weld gaps or the fitting of
steelwork connecting bolts;
•
Mechanically fail-safe gripping
mechanisms;
•
Automatic lifting and lowering without
any personnel in attendance at the jacks;
•
Pre-set overload protection;
•
Easy re-distribution of the jack loads;
•
Automatic synchronisation of lifting
speeds irrespective of loads;
•
Minimal maintenance of gripping
mechanisms;
•
Ample operating speeds;
•
•
Load is held mechanically not
hydraulically at any time movement is
stopped;
Gripping mechanisms are fully accessible
at all times;
•
Full efficiency in all attributes from
vertical through to horizontal;
•
Completely self contained & very
rugged.
•
Movement can be stopped and held
indefinitely at any point in jack stroke;
Hammerfest Project
Fagioli performed the erection of a
137m high flare stack weighing 638
tonnes.
It was raised using two of Fagioli 2nd
Generation Towerlift masts erected to
a height of 76.7m.
A cantilever lifting arrangement was
used and required two L450 lifting
jacks and two L300 tie-back jacks.
Two SPMTs (20 axles) were used for
tailing.
Sahara Project
Erection of a 883te vessel.
The vessel was erected using Fagioli
unguyed Towerlift system in crosshead
beam arrangement. Tower height was
64.9m. Four L450 strand jacks were
used for lifting.
Rigging included a swivel arrangement
for reactor rotation.
Second (smaller) vessel erected on the
same site.
Gatwick Airbridge (1)
The lifting system comprised of standard Fagioli PSC Towerlift masts and Strand
Jacks - the configuration adopted for this operation was as follows:
• Four twin base frames and eight 90 feet
high rectangular (3m x 2m) format
towers.
• Towers inclined together to form Aframes.
• Four twin top frames incorporating jack
support beams.
Athens Stadium
Fagioli carried out the lifting of the tubular arch sections forming the main
members of the new Athens Olympic Stadium roof for the 2004 games
Tube sections weighed up to 600
tonnes and were lifted to height of 85
metres.
Korean Airlines Hanger
The hanger roof at Incheon Airport is one of the largest ever built measuring
180m x 90m and weighing over 5,540 tonnes.
The lift utilised two L600 Strand Jacks on each of the six permanent support
columns.
BP Pompano Roll-up
The Pompano jacket is one of the world’s
largest steel offshore platforms. It stands
400m tall on a base that is 128m square at the
mudline.
Fagioli were awarded a contract for the supply
on hire and operation of a jacking system and
associated engineering services.
For the Pompano roll-up 16 Fagioli L600 jacks,
in tension frames, were fastened by slings to
the outer edges of the panels.
During the initial lift stage the jack system
carried 7,700te, at 30 degrees the load on the
jack system was 9,500te.
Yoho Deck Lift
Lifting of upper and lower deck using
eight L600 jacks and four L300 jacks
The Upper Deck weighing 740te was
lifted to a sufficient height to allow
the delivery of the Main Deck,
Mezzanine Deck & Trusses beneath.
The Upper Deck was then lowered
and connected to the assembly
below.
The complete assembly of Upper
Deck, Main Deck, Mezzanine Deck &
Trusses weighing 3,735te was lifted
to allow the delivery and assembly of
Cellar Deck & Mezzanine Deck
beneath.
The Upper Deck, Main Deck,
Mezzanine Deck & Trusses were then
lowered and connect to the assembly
below.