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在正循环钻孔灌注桩施工中，必须根据不同土质控制第二次清孔时间。清孔时间过短，泥浆比重和孔底沉渣量超标；时间过长，则比重越小，沉渣量越大。对第二次清孔时间进行监控，能获得比重和沉量渣最佳值。
In the construction of positively-circulating cast-in-place bored piles, the second hole-cleaning time must be controlled according to different soil quality. The time for clearing the hole is too short, the specific gravity of the mud and the amount of sediment at the bottom of the hole exceed the limit; if the time is too long, the proportion is smaller and the amount of sediment is greater. The monitoring of the second clearing time can obtain the best value of the specific gravity and sinking slag.