Vacuum Excavation of Existing Services
The external works include the demolition of a brick-built cycle shelter and replacement with a bus drop off zone and new hard landscaping to the car park in front of the modular building.
The area beneath the cycle shelter is heavily populated with services feeding the school including LV, HV and Gas. Upon completing several trial holes in accordance with the services plan it was discovered the services were laid shallow in the ground with some having less than 500mm cover. As a result of the incoming services feeding a live school, lowering the services was not a feasible option due to an extended shutdown requirement whilst the works were ongoing.
As a result, a propriety protection board has been proposed as a solution to protect the services. The cable protection was specified to be 230mm wide concrete tiles with marker tape to be installed above as a standard requirement. In order to install the protection board, the services needed to be fully exposed and the safest and most efficient method of ground clearance was Vacuum Excavation.