This paper discusses the challenges encountered in drilling and blasting of a small diameter shaft underneath a parking garage in historic Gastown, Vancouver, BC. This project involved drilling in a restricted headroom area, blasting in a confined space environment, and excavating using a novel vacuum technique. The 1.2m x 1.2 m x 8.5m deep shaft was required for installation of a hydraulic piston for a show lift. The project called for very accurate drilling through inter-bedded sandstone and siltstone within the water table. Development of a unique blast design was required for blast vibration control on a historic structure located just 15.8 meters away. The shaft was successfully completed without damage to any of the surrounding structures.
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机译：本文讨论了在历史悠久的Gastown，温哥华，巴克斯历史悠久的地下轴下钻探和爆破小直径轴的钻探和爆破挑战。该项目涉及钻入受限制的余地区域，在狭窄的空间环境中爆破，并使用新的真空技术进行挖掘。需要1.2m x 1.2 m x 8.5m深轴，用于安装液压活塞以进行显示升降机。该项目呼吁通过卧间砂岩和水桌内的砂岩钻探。在距离酒店距离酒店仅有15.8米的历史型结构，需要开发独特的爆炸设计。轴成功完成而不会损坏任何周围结构。
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