A support and reinforcement structure and construction method for deep foundation pit

Abstract

The invention provides a supporting reinforcing structure of a deep foundation pit and a construction method. The supporting reinforcing structure comprises a building, the foundation pit, a supporting structure and multiple isolation piles. The foundation pit is adjacent to the building, the periphery of the foundation pit is surrounded by the supporting structure, the multiple isolation piles are arranged between the building and the supporting structure, multiple grouting holes are formed in soil between the isolation piles and the supporting structure, and slurry is injected into the grouting holes. According to the structure, the influence of soil reinforcing on surrounding soil can be effectively removed, the influence of grouting reinforcing on the protected building is reduced, soil outside the foundation pit is reinforced, side deformation of the foundation pit and settlement of the soil outside the foundation pit can be greatly reduced, and the side effect of the foundation pit on the protected building in the construction period can be reduced.

Description

technical field [0001] The invention belongs to the deformation control technology of soft soil deep foundation pit construction. The invention relates to a support reinforcement structure and a construction method of a deep foundation pit adjacent to a protected building. Background technique [0002] When the deep foundation pit project is close to the protected building, in order to ensure the safety of the protected building during the foundation pit construction, it is necessary to control the deformation of the foundation pit. There are two traditional methods. One method is to reinforce the soil in the passive area of ​​the foundation pit and increase the support stiffness in the foundation pit to reduce the deformation during the excavation of the foundation pit, so as to achieve the purpose of protecting the building safety. After the method, the effect on controlling the deformation effect is not obvious, and the increased cost is more, especially in soft soil are...

AI Technical Summary

Problems solved by technology

There are two traditional methods. One method is to reinforce the soil in the passive area of ​​the foundation pit and increase the support stiffness in the foundation pit to reduce the deformation during the excavation of the foundation pit, so as to achieve the purpose of protecting the building safety. After the method, the effect on controlling the deformation effect is not obvious, and the increased cost is more, especially in soft soil areas, the settlement of the soil outside the pit caused by the deformation of the foundation pit cannot be eliminated, resulting in the damage of the protective buildings adjacent to the foundation pit. Potential safety hazards will always exist, often causing serious consequences such as structural cracks and house tilting

Another method is to use the method of soil reinforcement outside the pit to reduce the deformation of the foundation pit. The commonly used reinforcement methods include cement-soil mixing piles or grouting, but the construction of the mixing pile method will occupy a large construction space. The construction of the grouting method may cause the foundation and the ground of the protected building to bulge, thereby causing damage to the building. Therefore, when the protected building is close to the foundation pit, no matter whether it is reinforced by mixing piles or grouting, it will cause serious damage to the surrounding soil. Large impact, thus affecting the protected buildings

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