permitted the use of 4 in. thick glass to withstand the wind load of 65 lb. pressure.
The design of the ceiling is primarily in. mineral tiles, 2 ft. in width, with a teakwood strip 3 in. wide to receive internal partitions. Partitions may be placed at any point within this 2 ft. 3 in. module, thus lining up with the wood strip of the ceiling and window mullion. Other finishes used on the building are as follows:
Offices
Floors 1/8 in. vinyl asbestos tiles over a 121⁄2 in. screed with the telephone ducts beneath.
—
Ceilings Mineral fibre acoustic board with 3 in. wide teak strip and aluminium angle suspension system at 2 ft. 3 in. centres.
Lighting - Units of 2 ft. x 4 ft. 6 in. to fit with the 2 ft. 3 in. module.
Glass
J
thick.
Bronze tinted glass, 4 in.
Windows - Kalcolour bronze-colour aluminium.
Spandrils Mineralite finish.
External structural mullions - Off-
white, rubbed granolithic.
Core wall Dark brown Philippine
marble.
Doors
doors.
Arborite-faced solid core
Toilets, stairs, etc. Generally 2 in.
-
x 2 in. mosaic tile with Formica-faced cubicles and doors.
Ground floor
Columns-Off-white, rubbed grano-
lithic with hammered finish.
Lobby, floor and walls → Philippine
marble.
In forming the site the sides of the valley had to be cut to a maximum height of 60 ft. in hard decomposed granite. Substantial drainage channels were installed to keep rainwater out and heights of 9 ft. were cut at a time. Holes of 2 in. diameter were drilled to a depth of 12 ft. on a 5 ft. x 5 ft. grid and at an angle of 30 degrees below the horizontal to receive 1 in. diameter rock bolts with an expanding shell at the end. After installation of the rock bolts, the holes were plugged and grouted through a grout pipe at a maximum pressure of 100 p.s.i.
The core is carried down to a 4 ft. raft on bedrock and is stabilised by twenty-three 260-ton prestressed rock anchors. Seventeen of these rock an- chors, each using ten 0.7 in. stress-
Lobby, glass and windows 1⁄2 in. Column-free office space plate clear glass with bronze Kalcolour
aluminium frame.
External paving - Quarry tiles.
T
Driveway 6 in. x 6 in. granite blocks.
The colour scheme generally is off- white and bronze, with areas of light brown and dark brown marble.
Structure
The part of the podium structure beneath the tower is separated from the remainder by an expansion joint to allow free movement between the tower and the low structure. All loads are carried down to bed rock on a raft under the core, where the depth to rock is small; or through hand- excavated caissons under the columns. These caissons have a bearing pressure of 49 tons per sq. ft. and a maximum depth of 45 ft. below site formation level.
Staff dining room on the 20th floor
relieved strands, are installed on one side and are designed to resist the moment due to earth pressure as well as the wind moment. Two bearing plates, each anchoring five strands on CCL grips form the rock anchor at the bottom and a type 1007 CCL strand- force anchor is used on top of the raft.
The core was slipformed by Con- crete Silos Pty. Ltd. The 3 ft. 6 in. high steel formwork with two channel wal- ings was stiffened with tubular space- frames to form a rigid box within each bay. Provision was made in the form- work to reduce the overall width of the core by 2 ft. at ground floor level and the overall depth by 2 ft. at first floor level, thus reducing the thickness of the outer core walls from 2 ft. to 1 ft. Formwork, hanging scaffolding,
Far East BUILDER, February 1969
21
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