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钻孔灌注桩因能穿越各种土质复杂或软硬变化较大的土层(如各类黏性土、砂土、碎砾石土、风化岩及多夹层的岩层)对不良地基进行加固处理,其对承载力的适应范围广(为300～20000kN),施工机具简单,施工安全性好等诸多优点,因而在地基加固工程中得到广泛地应用。但由于钻孔灌注桩的施工环节较多,技术要求高,工艺较复杂,需要在一个较短的时间内快速完成地下水灌注混凝土隐蔽工程的灌注,无法直观的对质量进行控制,人为因素的影响较大,若稍有疏忽,很容易出现一些质量病害,甚至造成病桩、断桩等重大质量事故,危及桩基工程的安全。以下从分析桩基病害的成因入手,介绍一些控制桩身质量病害的技术方法,供参考。
Bored piles are used to reinforce the poor foundation because they can pass through various soil layers with complex soil or soft and hard changes (such as various types of cohesive soil, sand, crushed gravel soil, weathering rock and multi-interlayer rock) Its wide range of bearing capacity (300 ~ 20000kN), construction machinery is simple, good construction safety and many other advantages, which are widely used in the foundation reinforcement project. However, due to many construction steps of bored piles, high technical requirements and complex processes, it is necessary to quickly complete the perfusion of underground water pouring concrete concealed works in a relatively short period of time, which can not be directly controlled by quality and human factors Larger, if slightly negligent, it is easy to some quality disease, and even cause sick piles, broken piles and other major quality accidents, endanger the safety of pile-based projects. The following from the analysis of the cause of pile foundation disease to start with some of the technical methods to control the quality of pile body disease for reference.