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Foundations for Kowloon's tallest building have just been completed. Hong Kong-based contractor Gammon drilled boreholes for 240 soldier piles that form the diaphragm wall for the 65 storey, 360m high luxury residential development between August and November last year.

The company used a HD205P drilling rig, manufactured by HD Engineering, to carry out the boring after it found that the modified piling rig being used was unable to cope with the difficult ground conditions. The 3,000m2 site sits on reclaimed land made up of building material up to boulder size which contains, among other things, scrap metal.

This new hydraulic rig is designed for a variety of foundation drilling work and has a 13m high mast and retractable tracks to allow access to sites with space restrictions. It is particularly suitable for large diameter piling using down the hole hammers. On this contract it was able to form the generally 460mm to 560mm (occasionally 660mm) diameter boreholes to depths of between 20m and 40m.

The new waterfront development has been made possible by the lifting of building height restrictions since the closure of Kai Tak Airport in the heart of Kowloon after the new Chek Lap Kok airport opened last summer.

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