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Single Bore Multiple Anchor System (

Singapore has seen its first use of the Single Bore Multiple Anchor System (SBMA).

Contractor L&M Geotechnics recently finished work on the high capacity anchored bored pile contract at the Institution Building in Singapore.

A 45º slope, soil nailed in the mid1980s, was replaced by a 15m high bored pile wall retained by three rows of anchors. Initially 800kN working load anchors were required but SBMA and L&M Geotechnics jointly proposed using the multiple anchor system.

This meant half the number of anchors, with double the working load, could be used, said SBMA managing director Tony Barley. Anchor trials in May achieved 4500kN without failure and work was completed in October.

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