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一、反循环与正循环工艺的基本区别钻孔灌注桩反循环施工工艺恰恰是把正循环的工艺颠倒过来,把输进泥浆泵管作为输出(吸出)泥浆,把溢出(压力作用下上浮)泥浆改为输入(自动流入)泥浆,其设备基本与正循环相仿。二、反循环工艺施工的优点按反循环工艺施工,泥浆泵管与钻杆上部接通,通过钻杆中心的孔,作为吸出泥浆,再把吸出泥浆通过泥浆池自动返回孔壁流入,因此形成了以下几个优点: (1)泥浆造壁合理由于泥浆比重控制在1.05-1.10,流动淌入自由,失水率保持基本平衡,护壁厚度相对较薄,增强了混凝土表面与土壤的摩擦系数。
First, the basic difference between reverse circulation and positive circulation process The construction process of bored piles reverse circulation is precisely to reverse the process of the positive cycle, the input into the mud pump tube as the output (suction) slurry, the overflow (upload under pressure) The slurry is changed to input (automatic inflow) mud, and its equipment is basically similar to the positive circulation. Second, the advantages of reverse circulation process construction According to the reverse circulation process, the mud pump pipe connected with the upper part of the drill pipe, through the hole in the center of the drill pipe, as a suction mud, and then sucked mud through the mud pool automatically returns to the hole wall inflow, thus forming The following advantages: (1) Slurry wall formation is reasonable because the specific gravity of the mud is controlled at 1.05-1.10, the flow is free, the water loss rate remains basically balanced, the wall thickness is relatively thin, and the friction coefficient between the concrete surface and the soil is enhanced.