Forming method of large shallow foundation pit with soft soil foundation

Abstract

The invention relates to a forming method of a large shallow foundation pit with a soft soil foundation, which comprises the following steps: firstly, slope making: the slope making is performed for a soil body within 1.5-2.0 m under the earth surface of the foundation pit, the slope gradient is 1:1-1:0.5, and the side slope of the soil body is protected by adopting cement mortar with the proportion being 1:3; secondly, shoring: a shoring structural pile and a top beam are fixedly arranged near the wall of the foundation pit after the slope making, and the top level of the shoring structural pile and the top beam is 1.5-2.0 m less than that of the earth surface; thirdly, raining; fourthly, earthwork excavating; fifthly, pit bottom reinforcing: the pit bottom surface is reinforced by adopting a cement mixing method in a flower arrangement way, the reinforcement depth is 0.4-0.6 times of that of the foundation pit, and the foundation pit is formed after the bottom surface of the foundation pit is reinforced. The invention has simple construction method, good stability after forming and high safety factor and can effectively reinforce the shallow foundation pit, especially the large shallow foundation pit with a 3.5-6 m soft soil foundation in depth.

Description

technical field [0001] The invention relates to the construction field, and is aimed at shallow foundation pits with a depth of 3.5 to 6 m, in particular to a method for forming large-area shallow foundation pits on soft soil foundations. Background technique [0002] Soft soil foundations are often encountered in construction projects. The technical treatment of soft soil foundations in my country is divided into several different stages according to the period: 1. Before the 1970s, limited by immature technology development and poor economic conditions , most of which are consciously avoided in the design of soft soil for construction, so as not to increase project investment and bring adverse consequences to the use of buildings; 2. In the 1980s and 1990s, land resources became increasingly tense due to population expansion At the same time, the technology of soft soil foundation reinforcement has also made great progress, the economic conditions have improved, various soft...

AI Technical Summary

Problems solved by technology

Nowadays, many large-scale industrial equipment foundation projects need to be constructed on soft soil foundations. Large-area integral bottom plate structure design is often used in design. Although this design method can reduce the load per unit area of ​​the bottom surface, it also saves foundation treatment costs. There are some problems in the formation of shallow foundation pits on soft soil foundations that need to be solved urgently. For example, the traditional large-area shallow foundation pit construction mainly adopts soil excavation and grading technology, but the grading technology is often limited by critical ground environmental conditions. When the construction site is surrounded by adjacent buildings When there are shallow foundation pits in the surrounding area, only temporary measures can be taken to excavate and support the shallow foundation pits in soft soil foundations. A complete system has not been formed, so it cannot meet the needs of large areas. Requirements for Construction of Shallow Foundation Pit on Soft Soil Foundation

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