综合勘查方法在探测地下断落钻具中的应用

The Study of Application of Integrated Exploration Method in Detecting Underground Broken Drilling Stem

工程钻探中钻具掉落和钻孔偏斜超差一直是孔内事故中发生较多并难以处理的。如果掉落于地下的钻具由于钻孔偏斜超差偏离了设计的地下深度位置,偏斜方位又难以确定,而地下这个深度同时处于地下隧道施工中盾构旋挖设备的行进路线上,钻具有可能斜超差到了盾构施工区域,这样将严重破坏盾构施工设备的正常运行。这种特殊情况要求钻探施工方必须在钻具掉落的深度位置确定遗存钻具偏斜的具体方位,一旦确定钻具偏斜到了地下盾构施工区域内,必须通过各种手段取出掉落钻具。通过工程实例介绍了通过人工开挖探井、管线探测仪、磁力探测仪等多种勘查手段探测地下遗存金属钻具的方法,通过多种方法的应用效果对比,对工程钻探施工中钻杆掉落的工程难题的解决方案进行探讨。

In drilling engineering the drop and the deviation of the drilling stem are the common accidents which are difficult to deal with. If the skew torlerance is too large to deviate from the design depth position, and the skew direction is difficult to judge, at the same time the drilling stem is possibly in the working area of TBM（Tunnel Boring Machine）. This special case requires us to determine the specific skew position, once the drilling stem has deviated to the working area of TBM,we have to remove the drilling stem by all means.