The construction of drilled hole with shaft wall protection by drilling mud belongs to the concealed work, the pile quality influences directly the superstructure security and the building subsidence.
泥浆护壁钻孔灌注桩施工属于隐蔽工程，成桩质量的好坏直接影响上层结构的安全和建筑物的沉降。
There is no circulation in drilling with only a little amount of mud for wall protection without pollution to the environment.
不需要泥浆循环，仅用泥浆护壁，使用泥浆少，不污染环境。
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