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某单位在地基开挖时遇到一段地下人防工程坑道。为了保证大楼基础受力均匀、沉降一致，需将该段人防工程坑道拆除。由于该工程工期短，为实现快速拆除，我们决定用水压爆破技术拆除。此工程位于闹市区，正南为长途汽车站，距南面16.7m为交通干线，
A unit encountered an underground civil defense engineering tunnel when the foundation was excavated. In order to ensure that the foundation of the building is evenly distributed and the settlement is consistent, it is necessary to dismantle the tunnel of civil defense works. Due to the short construction period of the project, in order to achieve rapid demolition, we decided to demolish it using hydraulic blasting technology. The project is located in the downtown area, Zhengnan is the long-distance bus station, and 16.7m away from the south is the trunk line.