Loncor Homes Ltd.,
53 Davies Street, Mayfair, London,

Construction Period
November 2012 – April 2013

Design Team
Structural Engineers
Clark Smith Partnership,
75 Whitechapel Road,
London E1 1DU

Somorjay & Talliss Architects,
125 Mortlake High Street,
London SW14 8SN

M&E Consulting Engineers
URS Infrastructure & Environment UK Ltd.
6 – 8 Greencoat Place,
London, SW1P 1PL

This project involved the construction of a single storey basement in a residential area of West London directly off a main arterial route, namely Upper Richmond Road.

Initially Japanese knotweed was removed from the site & the entire site area was decontaminated by a Specialist Contractor in the control & eradication of Japanese Knotweed. A detailed dilapidation survey of all adjacent structures was undertaken together with the diversion of existing services within the basement demise. The earth retention method deemed to be the safest & most cost effective solution by Clark Smith Partnership & Vision’s Commercial Team was a King Post piled wall system. With this system steel H-piles were installed at intervals in a pre-augured, concrete infilled, excavation followed by gradual excavation of the site with continuous insertion of precast panels. This method was used successfully to ensure that the bulk excavation was undertaken in a safe manner without compromising the adjoining high rise structures. On this particular site localised pumping was sufficient to control ground water. A Voltex sodium bentonite waterproofing membrane was installed prior to casting the RC basement raft slab with a Triton cavity barrier system fixed to the basement floor & walls.

• Absolute caution was taken during basement bulk excavation to minimise soil disturbance & deflection to adjoining structures.
• Letter drops were carried out weekly to keep adjoining neighbours informed on progress & key deliveries.
• Deliveries were carefully scheduled as the main site access was from Upper Richmond Road which is a red route clearway as it is a main arterial route into central London.

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