We agreed to manage this contract as principal contractor for the enabling works prior to the start on the piling operation. An initial UXO survey was carried out to ensure that there was no history of unexploded war time bombs in the area. Communication with the Galliard construction team regarding the propping regime was carried out extensively to ensure practical safe working and economy. We carried out the pile mat design and pile mat installation, managed the muck-away from all of our operations including the guide-wall installation for the secant piled wall to ensure verticality.
Ground Conditions
The upper 4m of the ground was found to be fill material; this overlaid a sand and gravel layer with a thin 1m layer of alluvium material which sat upon the London clay which was found at 8.2m depth. Ground water was identified as laying at 2m depth.
Solution
600mm diameter continuous flight auger (CFA) piles were placed at 450mm centres through a guide wall. To ensure that a ground water seal was created the female piles were installed to 10m depth.
The male piles were drilled through the low strength gain mix to13.5m and reinforced with 6H25x13m bars in order to support 8.7m of retained soil.
The design criteria adopted was LDSA 2009 Guidance notes for foundation and EC7, Geotechnical design, 2004
CYGNET STREET DEVELOPMENT PROJECT SHEET
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