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在含有较大卵石的地层中施工桩基时,采用常规方式钻进,效率低、易塌孔超挖。针对卵石地层,尤其是含有较大漂石的卵石地层桩基施工难题,研制了一种具有捞石功能的钻具,配合回转反循环钻机使用。该钻具兼具反循环和捞石两种排渣系统,较大卵石通过捞石系统排出,其余钻渣通过泥浆反循环排出,为钻孔桩施工提供了一种新的思路。介绍了可捞石钻具的结构、制作及应用技术。实践表明,该钻具节约了钻孔过程中破碎较大卵石的时间,提高了钻进效率;同时回转反循环施工对孔壁扰动小,减少了坍孔超挖,取得了较好的综合效果。
In the construction of the foundation with larger pebbles, the pile should be drilled in the conventional way with low efficiency and easily overburden. Aimed at the pebble stratum, especially the pebble stratum with large boulder stratum, a kind of drilling tool with the function of rock fishing was developed, which can be used with rotary reverse circulation drilling rig. The drill has both reverse circulation and fishing stone two kinds of slag discharge system, larger pebbles discharged through the fishing system, and the remaining drilling slag discharged through the mud reverse circulation, which provides a new idea for drilling pile construction. The structure, production and application of grabs can be introduced. The practice shows that the drilling tool saves the time of crushing larger pebbles during the drilling process and improves the drilling efficiency; meanwhile, the construction of the rotary reverse circulation has small disturbance to the hole wall and reduces the overshooting of the collapse hole, and achieves better comprehensive effects .