采用外截内降（地下水）方法解决砂土人工挖孔桩的施工问题

在地下水位高且水量补给快的砂质地基中进行人工挖孔桩施工时,如何防止流砂引起塌孔是个关键问题,本文主要阐述采用外截和内降地下水的方法加以解决.使得基坑支护结构同时可兼作地下室侧墙,这就加快工程进度,又降低造价.

The Application of Intercepting and Lowering Phreatic water for the Construction of Hand-dug Piles in Sandy Subgrade

In sand subgrade, if the phreatic level is high and the replenishment of groundwater is fast, how to prerent pile hole slump due to quick condition is a key problem. In this paper, methods of intercepting and lowering of phreatic water is introduced. By the use of these methods, the pit bracing structures can also be used as side walls of the basement, so that the construction period can be shorten and the cost can be reduced.