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CONTRACTS

A NEW mixed use development site alongside the River Thames in London is getting bearing piles to support the exterior of a secant retaining wall.

Westpile is doing work on foundations for three mixed use buildings with 11, 12 and 15 storeys that will share a three storey underground car park.

The fi rst phase of installation at Bridges Wharf began in October with the installation of 290 linear metres of bored secant retaining wall, built using two heavy duty CFA rigs. The wall comprises soft primary piles with a 750mm diameter and 900mm diameter firm piles.

Pile depths are between 10m and 16m.

The second phase started last month with rig crews installing 500 cased rotary piles to about 30m down from the second basement level.

the £1.3M contract awarded by client Weston Homes, also has to cope with problems originating from the site's proximity to the river. Groundwater levels naturally fl uctuate with tidal fl ow and while it is necessary for piles to toe into London Clay, unmapped local depressions are common and make it necessary to adjust pile lengths to avoid a water path that flows beneath them.

The development, fl anked by the Battersea Heliport, includes 252 residential apartments, a 100 bedroom hotel and 2800m of commercial space.

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