Construction of a 1.5 storey 160m2 basement for a swimming pool and gym beneath an existing building. Works included design and installation of 55m long bored pile retaining wall, temporary stooling of existing building and installation of a 300mm thick piled underpinning slab at ground level. Excavation of the basement and installation of 300mm thick basement slab with sub-drainage and Gunite lining walls. Temporary structural propping arrangements were required in a temporary condition.
