Working alongside Erith we had to design a retention system that would not only retain the façade during the demolition works but due to limited space on site, incorporate enough space and loading capability for all site welfare units to be sited and a loading area for material removal.
With a large volume of pedestrian traffic using George Street, we designed a gantry scaffold that would provide protection to the public and at the same time allow us to erect the façade retention system above. The façade retention system comprised of three levels of lattice trusses. We designed a lightweight system that could easily be delivered to site, loaded onto the gantry scaffold and fixed in place complying with manual handling regulations. SHS steel sections were bolted together to form a lightweight but extremely robust truss system. As each level of truss was installed the scaffold continued above and the welfare units were lifted into position. PFC channel steels were utilised to tie the trusses back to the party walls.
Other elements of temporary works designed for this project were basement propping to the front retaining wall, internal chimney supports, a bay window propping frame and a full access scaffold to the rear elevation of the building. Swanton also devised a monitoring specification for the listed façade which would pick up any movement during the demolition works.