Foundation pit supporting system for subsurface structure close to soft ground stratum and construction method of foundation pit supporting system

Abstract

The invention discloses a foundation pit supporting system for a subsurface structure close to a soft ground stratum and a construction method of the foundation pit supporting system. The foundation pit supporting system comprises front-row steel pipe piles, rear-row steel pipe piles, front-row pile crown beams, rear-row pile crown beams and transverse connecting steel bars; the front-row steel pipe piles and the rear-row steel pipe piles are distributed in parallel along the wall surface of the pit wall of the foundation pit and are distributed in a staggered manner along the vertical direction of the pit wall of the foundation pit; the front-row pile crown beams are arranged at the tops of the front-row steel pipe piles; the rear-row pile crown beams are arranged at the tops of the rear-row steel pipe piles; and the front-row pile crown beams are connected with the rear-row pile crown beams through the transverse connecting steel bars. The foundation pit supporting system requires no anchor rod, so that underground space occupation can be reduced substantially, and limited ground and space within a property line are used fully. Filling piles are replaced by the front-row steel pipe piles and rear-row steel pipe piles for supporting, and no curing is required, so that the construction period can be shortened effectively, the problem that filling pile equipment occupies a field and pollutes the environment is solved, the working efficiency can be improved effectively, the quality can be controlled, and the risk of a foundation pit project is reduced greatly.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a foundation pit support system adjacent to an underground structure and a construction method thereof. Background technique [0002] In recent years, with the acceleration of urban construction, urban buildings have become more dense, land resources have become more and more tense, and geological conditions have become worse and worse. Building very close by. Since many areas prohibit or restrict the use of land beyond the red line of the building, while making full use of the land, it brings the following problems to the smooth construction of the building foundation pit: [0003] 1. The support method of pile row and internal support is adopted. Although the technical scheme is feasible, the construction cost is high, the process is complicated, and the construction period is long, which has a serious impact on earthwork excavation and the construction of the main stru...

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Problems solved by technology

[0003] 1. The support method of pile row and internal support is adopted. Although the technical scheme is feasible, the construction cost is high, the process is complicated, and the construction period is long, which has a serious impact on earthwork excavation and the construction of the main structure;

[0004] 2. With traditional pile (wall) anchor support, due to the limitation of adjacent underground structures and pipelines, the width of the soil behind the slope is limited, so the angle of the anchor cable is large, and the support effect is not good. Some slopes cannot be constructed with anchor cables at all. , and the excessive deformation of the waist beam often leads to the instability of the overall structure; the length of the cantilever section of the cantilever double-row pile support structure is limited, and the safety factor of the support is low, and the slope deformation is large

[0005] For projects with urgent projects and time constraints, these support forms cannot meet the requirements due to the need for maintenance time; and with the development of industrial and civil construction and municipal projects, there are more and more deep foundation pits and soft foundation projects, and the surrounding environment does not allow deformation Therefore, conventional maintenance-free support forms such as wood piles and steel sheet piles are not competent

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