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钻孔灌注桩和槽壁法等基础施工方法,都是在地基中先钻孔或挖槽,然后灌注混凝土成型的。施工过程中,尤其是在地下水位较高的软土地区,如何保证孔壁不坍.就显得特别重要。一、坍孔问题所谓坍孔就是在施上过程中由于种种原因引起的孔口、孔壁土体的坍落,致使施工进展困难,甚至无法按计划施工。根据坍孔发生的原因,可将坍孔分为三类;1.机械坍孔。是施工机具或钢筋笼擦伤孔壁引起的,只要谨慎施工和采用导向装置等措施就可避免坍孔。这种坍孔即使发生也只是局部的,故危害不大。
The foundation construction methods, such as bored piles and slotted walls, are all drilled or grooved in the foundation and then cast into concrete. During the construction process, especially in soft soil areas where the groundwater table is high, it is particularly important to ensure that the wall of the hole is not flawed. First, the boring hole problem The so-called boring hole is caused by a variety of reasons in the application process of the hole, hole wall soil collapse, resulting in difficult construction progress, or even unable to plan construction. According to the cause of the boring hole, boring holes can be divided into three categories; 1. Mechanical boring. It is caused by the construction equipment or steel cage scraping the wall of the hole. As long as careful construction and the use of guiding devices are adopted, boring can be avoided. This kind of boring is only partial if it occurs, so it is not harmful.