截止到1977年底,世界各国投入使用的天井钻机大约已有230台。这一事实充分说明天井钻机对采矿工业和建筑工业是非常适用的。天井钻机钻井同一般的天井掘进法相比有七个主要的优点:1.施工安全。2.成井周期短。3.减少了水平巷道的掘进工作量。4.成本低。5.井壁光滑。6.减轻了工人的劳动强度。7.减少了噪音。一、天井钻进成本分析天井钻进成本可表示为每个钻井场地的固 By the end of 1977, there were about 230 patio drilling rigs put into operation in various countries in the world. This fact fully demonstrates that the well drilling rig is very suitable for the mining industry and the construction industry. As compared with the conventional method of pit excavation, the well drilling rig drilling has seven main advantages: 1. Construction safety. 2. Aging cycle is short. 3. Reduce the level of roadway tunneling workload. Low cost. 5. Smooth borehole wall. 6. Reduce the labor intensity of workers. 7. Reduce the noise. First, the cost of drilling a patio Patio drilling costs can be expressed as a solid per drilling site