P J EDWARDS & CO (UK) LTD CASE STUDY www.pjedwardsuk.co.uk July 2017 WEDGE HOUSE, 32  40 BLACKFRIARS ROAD LONDON SE1 The piled foundations for this major hotel development comprised the following... · A perimeter retaining wall consisting of male & female rotary bored secant piles. A total of 139no male secant piles were drilled in diameters of 600mm, 750mm and 900mm and up to 33.05m deep below ground level. Similar quantities of 750mm diameter female secant piles were installed with depths of up to 12.05m below ground level. Male pile reinforcement consisted of cages of 12B32 main bars for the full length of the piles. Additional B25 bars were fitted to the rebar cages complete with Ancon tapered couplers for later extending into the basement slabs. Inclinometer tubes were also attached

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