Based on a few accidents that occurred in our bureau,the present condition of safety management and existent problems in rigs and teamsin geological exploration units under market economy are analyzed in the paper.

钻机班组是地勘单位安全管理的主要对象 ,地勘单位的安全事故几乎都发生在钻机班组。

During the process of trenchless construction,it is often inconvenient due to the bit water waymatching the pump output inappropriate.

在实际非开挖施工过程中,由于扩孔钻头水眼大小与泵量不能够很好地匹配,给正常施工带来很大的不便。