在美国考察期间,有机会参观了一次地震爆炸孔从钻井、下炸药到起爆,然后转点的全部施工过程,觉得比我们国内目前采用的方法要好,有可取之处。特介绍如下。当汽车钻开到选定的位置后,在驾驶员的控制下从车上用链条先放下一个其状如图1的铁斗。铁斗的四周边高约半米,底板上有一个直径为200毫米左右的孔。(钻杆正是穿过这个孔向地下钻进),孔的下面焊有高约150毫米的管子,伸出底板之外,以便能扎入泥土中。 During his visit to the United States, he had the opportunity to visit the entire construction process of a seismic explosion hole from drilling, detonation, detonation, and then to the point of transfer. He felt that it was better than the method currently used in our country and had merit. Special introduction is as follows. When the car is drilled to a selected position, under the control of the driver, a chain-shaped iron hopper like that shown in FIG. 1 is put down from the vehicle. The perimeter of the iron hopper is about half a meter high and there is a hole about 200 mm in diameter on the floor. (Drill pipe is drilled through this hole to the ground.) A 150 mm-high tube is welded to the underside of the hole and extends out of the floor so that it can be inserted into the earth.