United Kingdom, Oxford

Oxford Pump Station

LDA Secant Wall and Bearing Piles

The challenge

Piles were required to form a secant box with basement bearing piles to resist uplift forces for the Thames Water Oxford Pump Station project at the Oxford Science Park development.

Piles were required to be installed through interbedded layers of ground, including sandstone, limestone and clays down to depth, which required up to 20m of casing to avoid the need for support fluids.

The solution

Franki opted for the use of a Delmag RH44 rotary piling rig due to its high torque outputs enabling us to install 750mm, 1000mm and 1300mm piles segmentally cased up to 20M. The rig was able to deal with various high strength rock layers throughout the boring of the pile, with sample testing indicating strengths of greater than 100MPa in some cases.

Franki worked with the scheme designers to develop a wall layout making due allowance for various service openings and wall break-throughs in the locations of designated larger diameter soft piles to avoid encountering steel reinforcement when carryout out the break-through works.  

The bearing piles and secondary piles were all reinforced with full length prefabricated cages spliced with a ‘G Clamp’ system to allow safe and quick splicing of the cages whilst being installed with the attendant 70T telescopic crane.

 

Project details

Project nameOxford Pump Station
LocationOxford, United Kingdom
Building period -
SectorEnvironment
Area of expertiseEnergy, Water, Environment and Surroundings, Municipal Wastewater, Potable Water Plants, Water treatment

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