February_1966 — Page 77

eral site level was carried out for the building foundations and the circulat- ing water culverts.

The high load bearing properties of the ground at the site permitted the use of spread foundations and piling

was unnecessary.

Main Buildings

The main building incorporating the turbine hall and auxiliary plant bay will ultimately be 320 ft. long. 125 ft. wide and 90 ft. high.

The steel framework for the build- ing is a fully rigid box portal struc- ture with tapered sloping roof beams. The main box columns are fabricated from mild steel plate of thickness up to 11⁄2 in., factory welded and bolted together on site. The turbine house columns support a 280,000 lb. travel- ling crane spanning 86 ft. over the turbine hall.

The semi-outdoor boiler plant will ultimately cover an area of 287 ft. x 104 ft. Boilers are supported on steel structures independent of the turbine house building.

The reinforced concrete, brick lined chimneys are 300 ft. high, each chim- ney serving two boiler units.

The administration and water treat- ment plant buildings at the western end of the turbine house are also steel framed structures with brick cladding.

Circulating water for cooling the condensers is drawn from a new sea intake consisting of three 7 ft. square culverts arranged alongside the exist- ing A station intake culverts and ex- tending into the sea for a distance of over 500 ft. from the new pump house situated south of A station on an area of land reclaimed from the sea with material from the bulk ex- cavations.

were con-

These intake culverts structed within sheet steel piled coffer- dams and concrete filled steel box piles support the seaward end for a length of 97 ft.

The pumphouse was

Interior of the turbine hall at working floor level constructed in open excavation pro- tected from the sea by rock and earth bunds.

From the pumphouse to the con- densers in the turbine house base- ment, the circulating water is convey- ed, under pressure, via twin reinforc- ed concrete culverts of circular form. each 7 ft. 3 in. diameter internally. These culverts cross under the outfall culverts for the A station and the crossing involved carefully planned deep excavation and the under-pin- ning of the existing culvert which had to remain operational throughout.

The circulating water is returned to the sea through similar culverts, via a syphon seal, to a new outfall situated close to the southeast corner of the site.

Twin underground cable tunnels.

each 6 ft. wide and 7 ft. high, passing below the main circulating water cul- verts, connect the 66-kilovolt switch- house and transformer annexe with the control room in the turbine house building.

Civil Contractors

Drilling of trial bores Malayan Drillers

Ltd. and Gammon (Malaya) Ltd. Excavation and preliminary civil engineer- ing works Swee Construction & Transport Co. Ltd. General civil engineering works Union

Construction Co. (Shanghai). Circulating water civil engineering works

Paul Y. Construction Co. Ltd. buildings

Structural steelwork for

Redpath Brown & Co. Ltd. Superstructures Lim Kah Ngam. Reinforced concrete chimney Titeman

(Overseas) Ltd.

Painting of plant and buildings

Jones & Son (Contractors) Ltd.

George

Site seen from the south with the A station on the left

Far East Architect & Builder February, 1966

67