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THE JOINT venture building foundations and excavating the basement for the Berjaya Central Park Project in Kuala Lumpur claims it is installing Malaysia's first 3m diameter bored piles.

The UEMC-Bauer Malaysia team is building 27 of the big cast insitu piles for the 46-storey mixed development. The work is part of a design and build contract for a three-level basement.

The project involves installing 191 cast insitu bored piles - ranging from 0.9m to 3m in diameter - up to a depth of 58m as well as 7,360m 2 of diaphragm wall up to 23.5m deep. The longest of the 3m boreholes requires 450m 3 of stabilising bentonite and then 350m 3 of concrete to cast the pile.

A minimum of three large diameter piles and two diaphragm wall panels are being built at any one time, and to provide the enormous volume of bentonite required, a 1,600m 3 capacity processing, storage and recycling plant has been set up on site.

A Bauer BG40 rig is installing and extracting temporary casings fitted with head collars and tungsten carbide teeth to help installation and extraction.

After boring and mechanical toe cleaning has finished, site workers recycle the stabilising fluid to restore its geophysical properties. They check density, viscosity and pH and ensure sand content is reduced to less than 5%.

Although desanding is done at the borehole using a Bauer BE250 cyclonic desanding unit, a second BE250 unit desands at the plant.

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