Case Study: Temporary Sheet Pile Cofferdam for Research Facility, Cambridge

Temporary Sheet Pile Cofferdam for Research Facility, Cambridge

Contract No:C1098
Client:Skanska Construction (UK) Ltd
Value:Approximately £325,000.00
Summary:Design, supply, installation and extraction of temporary sheet pile cofferdam and associated temporary steelwork bracing to facilitate construction of new Energy Centre.

Sheet Piling Contractors, Sheet Piling (UK) Ltd. were appointed by Skanska Construction (UK) Ltd for the Design, supply, installation and extraction of temporary sheet piles and steelwork bracing to form a cofferdam to facilitate construction of a new Energy Centre.

The overall cofferdam dimensions were approximately 34.0m x 30.0m and the maximum excavation depth was 7.5m locally increasing to 9.5m.

Working closely with Skanska Construction (UK) Ltd during the design development stages, Sheet Piling (UK) Ltd provided a temporary sheet pile design solution which satisfied all the project criteria for the works.

Due to the sensitive nature of the site, the sheet piles has to be installed using a Silent Vibrationless Pile Pressing System.

However, due to the pile length and stiff cohesive nature of the prevailing ground conditions, Sheet Piling (UK) Ltd proposed to preauger the pile line prior to installation to provide certainty of the design pile toe level being achieved.

The sheet piles were then installed using a Giken Silent Vibrationless Pile Press complete with water lubrication.

To ensure temporary stability during excavation and satisfy the strict deflection criteria, an extensive temporary steelwork bracing frame was then installed by our in-house coded welders.

In total, 223no 12.0m/14.0m long Arcelor GU23 temporary sheet piles and 65Te of temporary steelwork bracing was supplied to the projects.

All the temporary sheet piles and temporary steelwork bracing was suppling from Sheet Piling (UK) Ltd extensive stock of temporary materials which are available for external hires or ‘Sale and Buy Back’.

The installation works were completed over a 6no week period during September and October 2015.