block will be the tallest building in North Malaya.
The ten blocks of four-storey buildings consist of two groups, each of five blocks. Each group has four common staircases located in the centre of bridges which inter-connect the buildings.
By this means only four staircases are provided to serve five blocks of flats. The layout will save the time and energy of callers, like postmen, who would normally have to walk up and down a series of flights of stairs before going over to the next block.
The project is designed by the Housing Trust Office, States of Malaya (acting chief architect, George C.S. Lee, B. Arch, ARIBA, ARAIA; supervising architect, Tan Kok Thye, B. Arch, ARIBA, regional architect).
Steen Sehested and Partners, Kuala Lumpur, are the consulting engineers.
The building contractors are Low Nai Bros. and Co., Kuala Lumpur. Piling is by Wing and Co., and lifts by Paterson Simons and Co., Ltd.
Four-storey blocks with interconnecting bridges
Slipforming Method Introduced in
Hong Kong
65 Juin 6
HYDRAULIC slipforming
a method concrete construction by which the formwork is moved con- tinuously and the concrete pouring and reinforcing work carried out simultaneously is to be introduced in Hong Kong by Acrow Engineers (Asia) Ltd., in conjunction with Con- crete Silos Pty. Ltd., of Austrialia.
―
The method has been used success- fully throughout the world on multi- storey structures, silos, chimneys, tow- ers underground shaft lining and the central service cores of tall buildings.
The slipform itself consists of dcuble or single sided vertical forms held to shape with walers and yokes. Jacks are fitted on the yokes. The working platform generally rests directly on the top waling of the formwork, or in cases where extreme- ly heavy loads are carried the beams are designed so that the load is tran- smitted centrifugally on to the yokes.
Below the main working platform, hanging scaffolding is erected to en- able the wall surface treatment to be carried out. The forms are lifted by means of the nydraulic climbing jacks which are spaced at a distance of 4ft. to 7ft., depending on the design of the formwork and the nature of the actual structure. These jacks climb on mild steel rods of lin. diameter. The old method of slipforming was based on the use of manual jacks, either of screw lever or cog type. In order to operate these, it was neces- sary to employ one man for each four to six jacks.
Nowadays jacks are used which
Far East Architect & Builder July, 1965
operate from a central power source. By employing this method one man can operate up to 180 jacks without difficulty. All that is required is the touch of a switch which sets in motion an electrically driven oil pump which in turn simultaneously feeds all jacks with oil under balanced pressure so that even, continuous lift- ing is achieved,
When concreting is commenced, pouring is carried out in even layers cf 9 in. to 12 in., each layer being vibrated. When the formwork is filled to a height of 3 ft., jacking operations are commenced and con- tinued at the same rate as the placing of concrete.
In the slipformed walls it is possible to fit core boxes to take window and door openings. It is also possible to directly insert door and window frames. The work- ing platform itself is quite often designed to act as formwork for the concrete roof slab after the slipform work has been completed.
in certain cases the com- pleted roof structure can be taken up
with the slipform, giving the added advantages that work can continue irres- pective of rain.
For slipforming to be used on a project, it is necessary that from its very conception the project is planned with this method of construction tinued at the same rate as the in mind. This in turn neces- sitates very early co-opera- tion between the architect,
“No Batterialba
client, designer and contractor.
Sub-contractors too are brought into the picture at an early stage be- cause through simple modifications it is often possible to speed up construc- tion and cut down the cost of their work.
In Hong Kong, the two companies are to offer a complete service in slipforming, including a full range of formwork, hydraulic and associated equipment made available on a rental basis, a design service and trained technicians for each job to supervise the installation of the cquipment.
Multi-storey block being built by slipforming
61
No comments yet.
Private notes are available after approval.