February_1970 — Page 26

Cement and ready-mix plant to serve HK Island

GREEN ISLAND CEMENT CO. LTD.

PALMER & TURNER

J. ROGER & PRESTON & PARTNERS

LANGDON EVERY & SEAH

GEORGE WIMPEY & CO. LTD.

THE narrow strip of land on which stands the new cement-bagging and ready-mix concrete complex of the Green Island Cement Co. Ltd. has a frontage of only 76 ft. on the Western District waterfront.

It is located in one of the most congested areas of Hong Kong where provision cargoes unloaded from Main- land junks cause a virtual blockage of the waterfront road.

On this site the architects were set the unenviable task of producing a scheme which would incorporate a ready-mix plant with silo storage for cement; material handling facilities offshore, a large amount of rentable storage space; and materials handling facilities for the warehouses within the

owners

architects

mechanical engineers quantity surveyors

main contractor

building. Additionally they were asked to allow the best possible access.

The scheme adopted meets all these requirements by providing a 14-storey building, a jetty for loading material from barges, and access to the building at both first floor and ground floor levels.

The reinforced concrete framed building is founded on bored piles, 4, 5 and 6ft. in diameter, designed for individual loading up to 1,300 tons.

The jetty, which is 350ft. long and 76ft. wide, is a two-tier structure over most of its length and three-tier at the extreme end where the pump house is sited. Adjacent to the water front two lifts of 30-ton capacity are provided for truck access to the building from a

bridge spanning the main waterfront road.

The most interesting feature of the project is the reinforced concrete con- veyor housing for material handling. It rises from the end of the jetty to the eighth floor of the building, 114ft. above road level. The housing is pre- cast in 5ft. and 10ft. sections, the larger size weighing 14 tons and mea- suring 7ft. square on the inside.

These units were erected on false- work and post-tensioned to provide two clear spans of 160ft. and 150ft.

Sand and aggregate, fed on to a 30in. conveyor belt inside the housing by a 9-ton capacity grab crane, are transported to silos from supply barges for the batching plant at a rate of 250 tons an hour.

In the pump house three 200 h.p. compressors facilitate the pneumatic conveyance of cement to both batch- ing and bagging plant storage silos via six 4in. diameter pipe lines run on the top of the conveyor housing.

Complex seen from the north with its conveyor housing leading from the jetty to the eighth floor of the main building

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Far East BUILDER, February 1970