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在覆盖较浅的北方内陆地区进行钻探施工,常遇到风化裂隙漏失地层,如果堵漏措施不当,往往严重影响施工进度.我队在72年钻探施工中,因钻孔漏水,由于没有找到一种有效的护壁堵漏方法,孔壁掉块严重,孔内事故增多,加之待水时间长,致使百米的浅孔施工期长达一个月以上.73年以来,我队应用“711”型水泥速凝剂(以下简称“711”)较成功地解决了护壁堵漏问题.同一机台在同一地区施工,台月效率达500米,比72年同期的台效提高五倍多.
Drilling construction in the shallower inland northern China often encounters the formation of fractures with weathered fissures, which often seriously affect the construction progress if the measures of plugging are not properly made.During the 72-year drilling construction, the team failed to find any water leakage due to drilling leakage An effective wall plugging method, hole wall block serious hole Accident, coupled with water to be a long time, resulting in a shallow hole construction of 100 meters for more than a month or so .73 years, our team use “711 ”Type of cement quick-setting agent (hereinafter referred to as“ 711 ”) has successfully solved the wall plugging problem.The same machine in the same area construction, Taiwan and the moon efficiency of 500 meters, over the same period in 72 years to improve five More times.