The London Bridge Thameslink project involved creation of a new concourse beneath where the tracks previously exited the station.
This required the demolition of part of the brick arch viaduct structure and had to be carried out in four phases to keep the station operational.
Due to short possessions agreed for closure of the station, there was significant motivation to complete as much work pre-stage as possible to minimise potential risk in delays for unforeseen events.
Wentworth House assessed cut lines, designed platform supports, arch ties and shores for partial demolition and openings through arches, needling and propping for openings through the arch support walls, and sequences of work to ensure stability at all times. All of this was complicated by previous alterations, bomb damage, and the fact that the viaduct had been built in several stages with the phased cut lines not matching the original build lines.
Wentworth House also provided a CAT3 checking service for the main contractor on his portion of temporary works.