38
-11.
3.
14
15.
IC.
170
.to.
1. Guide for reinforcement,
2. Oil tubing.
3. Dowel pin.
4. Railing,
5. Jack rod.
6. Rubber washer.
7. Hydraulic jack.
8. Stop cock.
9. Yoke channel.
10. Guide for reinforement.
11. Hanging scaffold.
12. Railing of reinforced bars. 13. Plank.
14. Boarding with holes for the vertical reinforcement bars.
15. Impulse timer.
16. High pressure pump.
17. High pressure switch.
18. Oil cleaner.
19. Gulding ring for jackrod.
20. Quick connection.
21. Flooring for working deck.
22. Joists.
23. Walers.
24. Form sheating.
25. Yoke leg.
26. Cable for hanging scaffold.
27. Plank.
28. Joist 4 ft. x 4 ft.
Typical slipform cross-section
ના,
25.
16.
of the
the Australian slipform repre- sentative, Mr. Ken Pinnel.
The technique of slipforming con- crete load bearing walls was develop- ed in Sweden just after World War II. when successful attempts were made to slide staircase and elevator cores to high buildings, following up with the construction of the re- mainder of the building columns, beams and floors by traditional methods.
Development and improvement of slipforming methods has been con. tinuous in Sweden and other Euro- pean countries over the past ten years, and considerable progress has been made in Australia on the slipforming of whole buildings. Concrete Silos Pty. Ltd. have been responsible for slipforming several buildings of 15 storeys and over during the last few years.
The term "slipform" relates to the method of pouring concrete where formwork is moved continuously and the concrete pouring and reinforcing work carried out simultaneously. As a technique it is quite simple when the fundamental principles are understood.
It is perhaps not a very well known fact that concrete has quite a consi- derable strength just a few hours after casting and this fact is used in respect of transferring the load from the slip- form platform through 1 in. diameter mild steel jack rods down into the green concrete as it leaves the sliding form and thence down into the still stronger concrete some feet below the sliding form.
First of all jack rods with screw threaded flush junctions are set up on a hardened concrete ground floor slab.
Far East Architect & Builder April, 1966
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