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开凿矿井井筒井口部分及城市与工业建筑用的地下井孔时,一般要穿过第四纪松软地层,采用槽钢金属井圈及木背板支撑这些构筑物。用手动机具挖岩与装岩,有时则使用手工操作的KC-3型抓岩机,这种抓岩机利用固定在锁口梁上的钢丝绳悬吊,尤其在浅井时,抓岩机在工作面移动时需用几个人才行。当浇灌混凝土时,由于临时井圈与岩石紧密贴实使井圈回收不了,因此大大提高了工程造价。
When digging wellhead sections of well shafts and underground wells for urban and industrial buildings, they generally pass through quaternary soft formations and use channel metal wells and wood backs to support these structures. Manual excavation of rock and rock with equipment, and sometimes the use of hand-cranked KC-3 grasping machine, the grasping machine used in the lock beam hanging rope, especially in shallow wells, the grasping machine at work Need to move a few people face line. When pouring concrete, the temporary well ring and the rock close to make the well can not be recovered, thus greatly increasing the project cost.