Page 7 - Deep Basements Project Examples

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Deep Basements - Example Projects

Kensington Row, London Services
Innovation in Design of Temporary Propping Systems
Ÿ Ground movement analysis
CGL's innovative approach to ground engineering paid off Ÿ Temporary works design and design checking
successfully in an unconventional temporary propping
system for a deep basement excavation. Ÿ Monitoring strategy and contingency planning
As a value engineered solution, the buttress pile system
Working with the principal contractor (O'Keefe superseded the original conventional proposal to construct
Construction) and the structural engineers (Walsh), CGL
a temporary earth berm and install a large network of steel
played a key role in the analysis and design of a buttress propping and thrust blocks. This revolutionary approach
pile temporary propping system for a deep basement in
Kensington. proved to be a cost effective and practical solution in
comparison to conventional propping systems.
Additionally, the buttress pile solution allowed for bearing
On this site, the buttress pile system supported a secant pile installation to be undertaken for a reduced dig level
pile wall within a 10m excavation. The buttress piles acted and an overall accelerated construction programme by
with the secant pile wall, through a rigid connection in the
eliminating restricted working spaces within the
form of a capping beam between both elements. This excavation.
increased the rotational and lateral stiffness of the wall
and ensured overall stability and serviceability was During the excavation and basement construction the site
maintained. This approach required the use of finite team confirmed that the wall performed well with
difference analysis software (FLAC) to model the complex monitored movements falling within allowable and
soil structure interaction. Serviceability limits on wall predicted limits. These suggest the buttress pile temporary
deflection and the corresponding ground movement
support system performed very effectively and is a great
allowed behind the wall were low due to the presence of example of what value engineering can achieve.
nearby Network Rail infrastructure.
CGL has subsequently implemented similar buttress pile
systems on other projects to maximise working space.

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