Foundation pit enclosure structure limit invasion chiseling-away residual pile and filling pile combined supporting method

Abstract

The invention discloses a foundation pit enclosure structure limit invasion chiseling-away residual pile and filling pile combined supporting method especially suitable for the situation of differentdegrees of limit invasion of multiple continuous enclosure piles. The method includes the following steps that firstly, a new crown beam, a new pile and a new support are constructed, and meanwhile rigid connection between filling piles and the new steel support is carried out; limit invasion enclosure piles are chiseled away step by step according to a certain sequence after support change, and part of a side wall and a middle plate are constructed; and finally, the support is detached, and the remaining part of a main structure is constructed. The combined supporting method is efficient, safe, reliable, high in adaptability and high in economic benefit, the strength of the whole supporting structure is enhanced while limit invasion is avoided, the safety and the economical efficiency ofconstruction are improved, and the method can be generally applied in the actual construction process.

Description

technical field [0001] The invention relates to the technical field of foundation pit enclosure, in particular to a foundation pit enclosure structure encroachment chiseling residual pile and pile repair combined support method. Background technique [0002] During the foundation pit construction stage, the retaining piles, as the force-bearing components bearing the horizontal water and soil pressure outside the piles, play a role in ensuring the normal excavation construction of the foundation pit and the normal restoration construction of the underground structure. However, in the actual implementation of the surrounding protection piles of the subway foundation pit, due to factors such as geological conditions, insufficient external protection piles, construction equipment and technical level of the construction team, a large number of foundation pit surrounding protection piles are encroached, resulting in the subway station underground The width of the structure does n...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the vertical support of the encrypted residual pile is that the construction of the underground structure is very difficult due to too many support channels, and at the same time, the safety risk of the foundation pit is also relatively large

[0005] The disadvantage of strengthening the ground outside the pile at the residual pile and reducing the groundwater level outside the pit at the same time is that it depends on the quality and reliability of the ground reinforcement. If the quality of reinforcement is not good, the method will fail

[0006] The disadvantage of the back pile corresponding to the residual pile is that the remaining bearing capacity of the residual pile is not considered, that is, the residual pile is abandoned and the new pile is directly lowered to bear the water and soil pressure outside the foundation pit, which is a lot of waste

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