Page 3 - Deep Basements Project Examples

Godalming London Exeter
01483 310600 020 3096 7567 01392 439905
Harrogate Bristol Dublin
01423 276000 0117 373 6140 (01) 554 6210

Deep Basements - Example Projects

Seymour Street, Central London Services
Perimeter Support and Temporary Works Design
Ÿ Ground Movement Report
The former Marylebone Police Station has Ÿ Full Temporary Works Design
been demolished to be developed into a
mixed-use scheme in Central London. The Ÿ Party Wall Design Report
new development will have seven storeys Ÿ Highways AIP
with a double storey basement across the
entire footprint. The existing liner and party Ÿ Royal Mail Tunnel Movement Modelling
walls along the two boundaries of the site Ÿ Advice on Resequencing
will be retained along with the raft within Ÿ Monitoring Strategy and Contingency Planning
the footprint of the existing double storey
basement that occupied around half of the Ÿ Full Contractor Support During Construction
site. Ÿ CAT II Temporary Works Design Checks

CGL was engaged by Galliford Try (GT) to provide
contractor support, pre-tender outline designs, support
regulatory approval for the project, then design the
perimeter support systems and temporary works during
excavation and basement construction.

The whole area is movement sensitive, particularly the
neighbouring buildings which are Grade II listed Victorian
structures. The terraced buildings were bookended using
the existing concrete lining walls and supported by four
large steel towers.

CGL divided the site perimeter into 8 salient design
sections, each of which required a different design solution
for piles or foundations depending on site conditions. Each
perimeter design has 7-10 stages of basement
construction thus providing a sequence and control for
excavation to limit movements.

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