Excavation method of foundation pit

Abstract

The invention provides an excavation method of a foundation pit. The excavation method comprises the following steps that, (S1), an excavation area of the foundation pit in a construction area is marked, and a plurality of drilling pouring piles are constructed according to a first given distance along a boundary line of the excavation area; (S2), precipitation construction is conducted in the excavation area so that soil layers of the excavation area are subjected to precipitation treatment; (S3), a circle of crown beams connecting from heads to tails are arranged along a boundary trend of the excavation area, so that the multiple drilling pouring piles and the crown beams are connected as a whole; (S4), a plurality of concrete support bodies arranged in parallel are arranged between thetwo inner side walls, arranged opposite to each other, of the crown beams according to a second given distance; (S5), a circle of retaining walls are arranged on the wall surface of the external sidewalls fitted with the crown beams; and (S6), soil bodies of the excavation area are excavated to form the foundation pit. According to the excavation method, the foundation pit is supported and protected before the excavation of the foundation pit, the overall support structure of the foundation pit is strengthened, the problem that the support and protection to the foundation pit is insufficientis solved, and occurrences of landslide, collapse and other accidents in subway stations after completion are avoided.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a method for excavating a foundation pit of a subway station. Background technique [0002] In recent years, subway construction has been carried out in various cities. When constructing subway stations, foundation pits need to be excavated. At present, the common excavation methods for foundation pits include slope excavation, underground excavation technology, and open excavation technology. During the excavation process of the foundation pit of the subway station, there will be problems such as insufficient grading, insufficient support, and poor precipitation. Due to the above-mentioned problems, it is very easy to cause landslides, collapses, and water gushing in the subway station built later. Accidents, dealing with these accidents is not only difficult and costly, but also has a great negative impact on the society. Therefore, in order to completely solve...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of excavation method for the foundation pit of the subway station, aiming at accidents such as landslides and collapses in the completed subway station caused by problems such as insufficient foundation pit support when excavating the foundation pit of the subway station. method to avoid the occurrence of the above-mentioned accidents

Images