Two London basement schemes were made possible after Hewson Consulting Engineers joined forces with equipment manufacturer Conquip Engineering Group to develop a new hybrid excavation propping.
The lightweight system was designed to fast track work on site and Hewson has said that the solution saved significant time on the construction programme and could benefit the wider industry.
The two projects that have benefited from the solution so far are a single level basement on the £150M LBS Estates 53 storey residential tower at Canary Wharf and a two level basement on Reef Estates’ 22 storey hotel on Commercial Road in Aldgate.
According to Hewson, the system’s careful detailing of the prop lengths, control of deflections, practical design and detailing of prop ends and housing for the jacks at the interface with secant piled wall corbels or capping beam levels all proved significant on the projects delivered so far.
“An installation methodology was drawn up by both designer and installer, that was straightforward, fast and economic, and gave programme saving on each contract,” said Hewson associate director Paul Perry.
Perry has said that use of the system on the two projects has led to improvements. “As the props move from project to project, loads, lengths, connection pieces and details were interrogated to ensure the best design and the best detail was chosen for this hybrid, reusable, system,” he said.
“A large amount of considerations was given to the improvements to the loads, lengths, connection pieces and details of the props to ensure the best design and detail were chosen for this hybrid, reusable system.”