Drilling&Blasting of a small Diameter shaft next to Historic structures

摘要

This article discusses the challenges encountered in drilling and blasting of a small diameter shaft underneath a parking garage in historicj Gastown,Vancouver,BC.Thisproject involved drilling in a restricted headroom area,blasting in a confined space environment,and excavating using a novel vacuum technique.The 1.2mX1.2mX8.5m deepshaft was required for installation of a hydraulic piston for a show lift.