Slipform

Construction and Civil Contracting
SLIPFORM
CONSTRUCTION
Slipform construction
of the building core
on the Bishops See
project in Perth, WA
SLIPFORM
CONSTRUCTION
2
SLIPFORM CONSTRUCTION CAPABILITY
The advantages
of the slipform
system include:
Greater speed
and earlier
completion of
construction
projects
SRG is a well established professional engineering and
contracting operation with over 50 years experience.
We are currently operating from offices throughout
Australia as well as Hong Kong and the Middle East.
SLIPFORM SPECIALISTS
safety, quality, environment
SRG provides a complete slipform
service. We maintain experienced
teams of personnel available to assist
in all aspects of construction including
design, planning, programming and
construction techniques relating to
slipforming methods.
Safety, Quality and the Environment
are paramount to SRG. We believe
that responsible health and safety
management as well as superior health
and safety performance is integral to
an efficient and successful project.
It is essential that our experienced
slipforming personnel are included
at an early planning stage to ensure
maximum benefit of the slipforming
process to your project.
SRG are well equipped to undertake
projects wherever the location. Our
proven track record and experience, as
well as our focus on safety, quality and
environment ensures SRG are the right
people for the job.
Being a customer focused organisation
with an intense desire to be the best in
our field, SRG operates and complies
with the requirements of the following
Quality Management, Environmental
Management and Occupational Health
& Safety Management Systems.
Occupational Health & Safety
Management System
AS/NZS 4801:2001
OHSAS 18001
Quality Management System
ISO 9001:2008
Environmental
Management System
AS/NZS ISO 14001:2004
SRG has gained Federal Safety
Commission accreditation and is also a
founding member of the Post-Tensioning
Institute of Australia (PTIA).
SLIPFORM CONSTRUCTION CAPABILITY
3
SLIPFORM
CONSTRUCTION
Slipform construction of a cement silo for BGC Cement in Kwinana, WA.
The slipform technique is a rapid and economical
construction method that can achieve considerable
cost savings when compared with the cost of
conventional formwork.
The slipform construction system
becomes viable on regular shaped
structures generally four storeys or
greater in height. Shorter slipforms
can be economical where there are a
number of near identical structures.
The advantages of the slipform
system include:
„„Off
site assembly
„„Greater
speed and earlier
completion of construction
projects
„„Early
completion of lift motor
rooms and early installation of
lifts, plumbing and electrical
services
„„Reduced
craneage as forms are
lifted by hydraulic jacks
„„Reduced
scaffolding and
temporary work platforms as
the slipform system contains its
own platforms for working. This
also results in a cleaner and less
congested construction site
„„A
uniformity of wall sections and
layouts can be achieved with the
slipform method.
„„Reduced
labour costs, as the
system provides an intensive work
environment
The slipform process involves the continuous upward
movement of formwork by means of jack rods and
hydraulic jacks.
The slipform system is a hydraulically
operated formwork system. Six
tonne hydraulic jacks are mounted
on strategically located steel yoking
frames to lift the formwork as the
concrete is poured into the forms.
The formwork system uses 1,066mm
high steel panels held rigidly by a
framework built up from steel waler
frames, trusses and bracing.
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SLIPFORM CONSTRUCTION CAPABILITY
The framework provides rigidity to the
slipform as well as support for timber
decking to form a working platform for
placement of concrete, reinforcement
steel and blockouts for doors and
windows.
The slipform process explanation
continues
TYPICAL SECTION THROUGH SLIPFORM SYSTEM FOR VERTICAL STRUCTURES
TOP HANDRAIL POST
CLADDING
TIMBER AND PLY DECKING
PERIMETER TIMBER RAILS
JACKROD
TOP
DECK
TOP HEAD CHANNEL
PERIMETER TIMBER RAILS
MESH
HANDRAIL CHANNEL
‘C’ TYPE YOKE
3 TONNE
HYDRAULIC JACK
HEAD CHANNEL
HYDRAULIC PUMP
WATER
LEVEL
TANK
CLADDING
TIMBER AND PLY DECKING
WORKING
DECK
BOX FRAME
CANTILEVER BRACKET
WALER ASSEMBLY
TRAILING DECK
VERTICAL HANGER
TRUSS
MESH
CLADDING
HANGING SLINGS
TIMBER AND PLY DECKING
TRAILING
DECK
PERIMETER TIMBER RAILS
LEDGER
Concrete is poured into the forms in
layouts of approximately 200mm.
The setting rates of concrete are
constantly monitored to ensure that
it is matched with the speed at which
the forms are raised. The jacks lift the
forms approximately 25mm per stroke,
generally producing a slipforming rate
of 300mm to 450mm per hour.
Slipforming can be performed on
either a continuous basis (i.e. 24 hours
per day), or a discontinuous basis
(i.e. pouring to a predetermined height
usually within one working day).
As the formwork is raised,
reinforcement is held in the correct
position using guides fixed to the top
of the yokes. Horizontal reinforcement
is threaded under the yokes and tied
to the vertical reinforcement.
Blockouts for doors and windows can
be formed with either timber or steel.
These are installed as the slipform
proceeds and can be stripped from
the trailing decks. Similar methods
are used for rebates that provide
connections between beams, slabs
and the slipform walls.
When the formed concrete is exposed
from the bottom of the steel forms it is
treated to meet the specified finish.
SRG’s experienced engineering and
operational personnel ensure the
smooth operation of the slipforming
process and control of verticality.
SRG’s technical staff are always
available to advise on all aspects of
slipforming including coordination of
various trades to optimise resources.
SLIPFORM CONSTRUCTION CAPABILITY
5
TAPERED
SLIPFORMING
Mount Piper Power Station, 275m tall chimney stack tapered slipform construction
at the coal powered power station located in Portland, New South Wales.
Tapered slipform is required for the construction
of conical chimneys, cooling towers, piers and other
tall concrete structures involving constant or changing
thicknesses in walls, diameters and / or shapes.
SRG has been involved in the
construction of tapered towers and
chimneys from 50m to 275m high, with
diameters changing from 25m to 6m,
and wall thicknesses changing from
700mm to 250mm.
While the tapered slipforming process
is similar to that used on the standard
slipform equipment, the logistics and
6
SLIPFORM CONSTRUCTION CAPABILITY
planning require greater attention.
The heights can often make the use of
cranes impractical. SRG’s experience
and expertise ensures the success of
such projects.
TYPICAL SECTION THROUGH SLIPFORM SYSTEM FOR TAPERED STRUCTURES
CONCRETE CHUTE
AND DISTRIBUTION HOSE
SCREW FOR
ADJUSTING
INCLINATION
UPPER DISTRIBUTION
AND WORKING DECK
SPIDER
BEAMS
RADIUS
SCREW
SCREW FOR
ADJUSTING
WALL THICKNESS
HYDRAULIC
TURNBUCKLE PUMP
HYDRAULIC
JACK PUMP
WORKING DECK
JACKROD
LIFTING YOKE
3 TONNE
HYDRAULIC
CLIMBING JACK
6 TONNE
HYDRAULIC
CLIMBING JACK
HYDRAULIC
TURNBUCKLE
HYDRAULIC
TURNBUCKLE
HANGING
SCAFOLD
Tapered slipform construction
of the Telecom communications
tower, located on the top of Mount
Wellington in Hobart, Tasmania
WORKING DECK
HANGING
SCAFOLD
Tapered slipform construction of Collie Power
Station, 160m tall. Collie, Western Australia
SLIPFORM CONSTRUCTION CAPABILITY
7
about
us
We are an Australian complex services company.
We solve the challenging and difficult problems
that others can’t. Our vision is to make the
complex simple for our customers.
We have people working across Australia and the
world bringing our unique blend of innovation,
precision, technical excellence and safety to every
mining and infrastructure project we touch.
Since 1961, we have worked on many of the iconic
stadiums, skyscrapers, bridges, dams, structures
and mining projects, both here in Australia,
and overseas.
Issue 2016/04
That’s because we’re not afraid to challenge what
is considered possible.
Get to know us at srglimited.com.au
aUSTRALIA / AFRICA / MIDDLE EAST / ASIA PACIFIC / HONG KONG
SRGlimited.com.au
CALL
1300 775 477
+61 8 9267 5400