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Deep basement progress on Merchant Square

Construction of a 9m deep basement by P J Carey in West London is progressing well despite its close location to the Grand Union Canal and poor ground conditions at the site.

The excavation for the 3 Merchant Square mixed-use development just off the Edgware Road at Paddington is lined with a combination of steel sheet piles and a secant piled wall. Concern over the significant and variable lateral forces imposed on the piled retaining wall meant that getting the right support for the work was essential.

Carey is using five 500t capacity MP500 Super Struts and four 150t capacity MP150 knee-braces from Groundforce to support the 100m long and 49m wide excavation.

According to Carey, the Groundfroce struts were chosen primarily to maximise the amount for working space inside the excavation so the basement slab could be cast and work could begin construction of the central core without undue interference due to supporting steelwork.

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