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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, although multiple

uses on shorter structures has been achieved economically in the past.

ECONOMICAL SOLUTION

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ADVANTAGESThe advantages of the slipform system include:

Off site assembly

Greater speed and earlier completion of construction projec ts

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 constructed site

A uniformity of wall sec tions and layouts can be

achieved with the slipform method this is not

achievable with conventional formwork systems

Reduced labour costs, as the system provides

an intensive work environment

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The slipform system is a hydraulically operated formwork system. 3 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 1066mm high steel panels held rigidly by a framework built up from

steel waler frames, trusses and bracing. The framework provides rigidity to the slipform as well

as support for timber decking to form a working platform for placement of concrete, rein-

forcement steel and blockouts for doors and windows.

Concrete is poured into the forms in layers of approximately 200mm. The setting rates of con-

crete are constantly monitored to ensure that it is matched with the speed at which the forms

are raised. The jacks lift the form approximately 25mm per stroke generally producing a slip-

forming rate of 300mm per hour.

Slipforming can be performed on either a continuous basis (i.e. 24 hours per day), or a discon-tinuous basis (i.e. pouring to a predetermined height usually within one working day).

As the formwork is raised, reinforcement is held in the correc t position using guides fixed to the

top of the yokes. Horizontal reinforcement is threaded under the yokes and tied to the verti-

cal reinforcement.

Blockouts for doors and windows can be formed with either timber or steel. These are in-

stalled as the slipform proceeds and can be stripped from the trailing decks. Similarly with re-

bates that are used to provide connections between beams, slabs and the slipform walls.

When the formed concrete is exposed from the bottom of the steel form panels it can besponged or treated if required.

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SLIPFORMING PROCESS

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Structural Systems experienced engineering and operational personnel ensure the smoothoperation of the slipforming process and control of verticality. Structural Systems technica lstaff are always available to advise on all aspects of slipforming including coordination ofvarious trades to optimise resources.

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Typical section through slipform system for vertical structures

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Structural Systems is also heavily involved in the construction of conicalchimneys, cooling towers, piers and other tall concrete structuresinvolving constant or changing thicknesses in walls, diameters and/ orshapes. Structural Systems has been involved in the construction oftapered towers and chimneys from 50m to 275m high with diametersand wall thicknesses changing from 25m to 6m and 700mm to 250mmrespectively.

While the slipforming process is similar to that used on the standardslipform equipment the logistics and planning require greater attentionthe heights which often make the use of cranes impractical. StructuralSystems experience and expertise ensures the success of such projects.

Typical section through slipform system for tapered structures

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TAPERED SLIPFORMING

1. Upper distribution and

working deck

2. Working deck

3. Hanging scaffold

4. Radius screw

5. Screw for adjusting wall

thickness6. Screw for adjusting inclination

7. Horizontal turnbuckles

8. Spider beam

9. Lifting yoke

10. 3 tonne hydraulic climbing jack

11. J ack rod

12. 6 tonne hydraulic climbing jack

13. Hydraulic jack pump

14. Hydraulic turnbuckle pump

15. 6 tonne climbing rod extractor

16. 3 tonne climbing rod extractor17. High pressure hose 3/8

18. High pressure hose 1

19. Distribution pipe

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CONCLUSIONStructural Systems innovative engineering and strict quality control ensures the increasingdemands within the building industry to come up with solutions for difficult construction prob-

lems are met at the highest level, ensuring an efficient cost effective solution.

Structural Systems is committed to maintaining the highest level of service at all times and tomeet the changing demands of the building and construction industry.

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Structural Systems (Civil) Pty Ltd

ABN 31 083 214 43920 Hilly Street

Mortlake, NSW Australia 2137

Tel: +61 2 87676200

Fax: +61 2 87676299

Web: www.structuralsystems.com.au

VICTORIA 112 Munro Street, South Melbourne

VIC 3205 Australia

Tel: +61 3 9296 8100Fax: +61 3 9646 7133

WESTERN AUSTRALIA 24 Hines Road, OConnorWA 6163 Australia

Tel: +61 8 9267 5400Fax: +61 8 9331 4511

QUEENSLAND Unit 2, 16 Maiella St, StapyltonQLD 4207 Australia

Tel: +61 7 3442 3500

Fax: +61 7 3442 3555

MIDDLE EAST Office 603, Business Avenue, Deira

PO Box 28987, Dubai, United Arab Emirates

Tel: +971 4 2948 974Fax: +971 4 2948 984

AFRICA Block B, 60 Civin Drive, Pellmeadow Office Park

Bedfordview, J ohannesburg 2008, South AfricaTel: +27 11 409 6700

Fax: +27 11 409 6789