The isolation devices are essentially giant rubber-and-steel pads that are installed at the very bottom of the excavation for a building, which then simply sits on top of the pads.
隔离设备实际上就是安装在建筑物开挖时最底层的巨大的橡胶钢铁垫，建筑物就坐在这些垫子上面。
2
The benches allow equipment and personnel access to the fresh ore (gray) exposed at the bottom of the excavation.
这些平台是使（采矿）设备和工人抵达矿坑底部，到新挖出来的矿石（灰色）面前的通道。
3
The paper compares the methods dealing with water leakage from trough bottom of water-sealed gasholder, and introduces the construction way and effect of excavation method.