Loess foundation pit supporting method

Abstract

The invention discloses a loess foundation pit supporting method, which comprises the following steps: throwing water draining traction pipes (2) into to-be-supported boundary walls (1) of a foundation pit by a certain dip angle that beta is equal to 5 to 10 degrees; keeping length of the water draining traction pipes (2) out of the boundary walls (1) at 20 to 30 cm; fixedly connecting draw bars (5) with top ends of the water draining traction pipes (2) through connecting holes (31) at the centers of bow-shaped supports (3), and keeping two ends of the bow-shaped supports (3) in contact with the supporting boundary walls (1) through mounting plates (4). Compared with the prior art, the loess foundation pit supporting method has the following advantages: (1) a scheme can solve both the water draining and the supporting problems; (2) the supporting at the bottom of the foundation pit is not needed, so that the occupation problem of the construction plant at the later stage is solved; (3) large construction machinery is neither required, nor long term work; (4) the supporting device can be repeatedly used for many times, and simply processed.

Description

technical field [0001] The invention relates to the construction field, in particular to a loess foundation pit support method. Background technique [0002] Under the self-weight stress of the overlying soil layer, or under the joint action of self-weight stress and additional stress, the soil that undergoes significant additional deformation due to the structural damage of the soil after soaking is called collapsible soil, which belongs to special soil. Loess widely distributed in parts of Northeast, Northwest, Central and East China is collapsible. [0003] Loess soil is a special Quaternary continental loose deposit with special properties. Loess has high strength when it is dry, but it shows obvious collapsibility when it meets water, which is determined by the composition and structure of loess itself. Loess contains more than 60 kinds of minerals, mainly detrital minerals and some clay minerals. Detrital minerals are mainly quartz, feldspar, and carbonatite; most o...

AI Technical Summary

Problems solved by technology

[0010] 1. The soil quality of the foundation pit wall is unstable, and it is affected by groundwater;

[0011] 2. The amount of slope excavation is too large and uneconomical;

[0012] 3. Limited by the construction site or adjacent buildings, grading excavation cannot be used

[0015] The collapse of most foundation pits is mainly caused by two reasons, one is insufficient support, and the other is poor drainage. Therefore, to solve the problem, the support strength and drainage problems must be solved at the same time

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