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正循环钻成孔灌注桩基本原理正循环钻成孔施工法是由钻机回转装置带动钻杆和钻头回转切削破碎岩土,钻进时用泥浆护壁、排渣;泥浆由泥浆泵输进钻杆内腔后,经钻头的出浆口射出、带动钻渣沿钻杆与孔壁之间的环状空间上升到孔口溢进沉淀池后返回泥浆池中净化、再供使用。这样,泥浆在泥浆泵、钻杆、钻孔和泥浆池之间反复循环运行。
Positive circulation drilling hole injection pile basic principle Positive circulation drilling hole construction method is driven by the drilling rig rotary drill bit and rotary cutting crushing rock and soil, drilling mud protection wall, slag; mud from the mud pump into the drill pipe After the lumen, it is injected through the slurry outlet of the drill bit to drive the drilling slag to rise upward along the annular space between the drill pipe and the hole wall to overflow into the sedimentation tank and return to the mud pool for purification. In this way, the mud circulates repeatedly between the mud pump, drill pipe, borehole and mud pool.