LUL RAIL TUNNEL CASE STUDY

• Remedial works to portal involved stitch piling plus horizontal tie backs

• Poor bearing ground had led to rotation of portal face and movement

• Combination of vertical and raked piles total of 6 to each abutment

• Hybrid solution adopted

• Pre cored pilot hole

• 220mm permanent (slotted) cased symetrex drilled pile to base – 8m

• 168mm thin walled casing extended on to clay through tricky soft clays and gravels

• 150mm auger pile to a depth of 30m

• Grouted with 32mm GEWI

Combining competitive pricing with our design experience and comprehensive range of foundation techniques, we offer a unique service from our strategically placed regional offices. We pride ourselves on the efficient delivery of every stage of the project from design to completion, on time and within budget. Our Engineers will investigate a problem, review the limitations and options, recommend what action to take and then ensure that it is implemented effectively. We are always willing to discuss which foundation methods may be appropriate to a particular problem.