
As part of the redevelopment of Epsom Downs Racecourse a new grandstand is to be constructed.
CLIENT Epsom Downs RacecourseCONTRACTOR Willmott DixonENGINEER NRM BobrowskiSCOPE105 no. 600mm Diameter Rotary Bored Bearing Piles between 6.8 and 19.4m depth 12 no. 750mm Diameter Rotary Bored Bearing piles to 17.5mPLANTBauer BG9 40t Drilling Rig Dumper
As part of the redevelopment of Epsom Downs Racecourse a new grandstand is to be constructed. This is to be done in two phases with the lower tier open for the 2008 Derby race and the upper complete for 2009. The high column loads including horizontal forces from wind pressure meant that piles were required.
Structured chalk of low to medium density was found beneath the made ground at depths varying between 0.1 and 2.8m depth. The quality of the rock increased with depth and provided ultimate end bearing capacities of up to 7800kN/m2. The design was carried out in accordance with CIRIA guide C574 with limits placed on the proportion of the capacity accommodated in end bearing in order to limit the pile settlement.
Loads of between 600 and 3000kN per pile and dry, stable ground conditions meant that large diameter rotary bored piles of 600 and 750mm diameter were the preferred solution. In isolated locations loose fill material was present and temporary casing was required to support the bore until concreting of the pile was complete. To aid the trimming of these large diameter piles debonding was supplied to the reinforcement down to cut off level and a pile cropper was then easily able to lift the sacrificial part of the pile off.
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