A reinforcement method for the existing municipal utility gallery within the scope of deep foundation pit excavation

Abstract

The invention relates to a method for reinforcing an existing municipal pipe gallery within a deep foundation pit excavation range, and is particularly applied to the condition of excavating a large-sized foundation pit when a municipal pipe gallery exists in a thick alluvial formation. The method comprises the following steps: constructing ordinary precast piles and pipe gallery reinforcement precast piles, wherein reserved connection devices are arranged on the pipe gallery reinforcement precast piles; excavating a foundation pit soil body from top to bottom until the reserved connection devices on the pile bodies are exposed; simultaneously pouring a pipe gallery support structure taking a soil model as a template below the pipe gallery and beams on two sides of the pipe gallery by taking the reserved connection devices of the pipe gallery reinforcement precast piles as support points; constructing anchor ropes, wherein one end of each anchor rope is anchored onto the corresponding beam, and the other end of each anchor rope is connected with a top beam on the corresponding pipe gallery reinforcement precast pile; continuing excavating the residual foundation pit soil body to a baseline of the foundation pit, constructing air duct structures, and integrally pouring waist beams of the foundation pit and air duct top plates to finish the construction. According to the method, the stability of the soil body around air ducts during the excavation of the air ducts is ensured, and the influence of excavation of the soil body on the lower part on the pipe gallery is reduced, and the pipe gallery is supported in advance.

Description

technical field [0001] The invention relates to a method for reinforcing the existing municipal pipe gallery within the excavation range of a deep foundation pit, and is especially suitable for excavating a large foundation pit when there is a municipal pipe gallery in a thick alluvial stratum. Background technique [0002] When the open-cut subway air duct passes through a large municipal pipe gallery in the city, due to the strict deformation requirements of the municipal pipe gallery structure, the excavation of the foundation pit will cause the bottom of the pipe gallery to be suspended. If improper measures are taken, the healthy service life of the pipe gallery will be seriously affected. The safety of the pipeline poses a threat; if a pillar is erected under the pipe gallery, it will affect the construction of the tunnel roof and the laying of waterproof materials, and it is also difficult to adjust the deformation of the pipe gallery according to the detected displace...

AI Technical Summary

Problems solved by technology

[0002] When the open-cut subway air duct passes through a large municipal pipe gallery in the city, due to the strict deformation requirements of the municipal pipe gallery structure, the excavation of the foundation pit will cause the bottom of the pipe gallery to be suspended. If improper measures are taken, the healthy service life of the pipe gallery will be seriously affected. The safety of the pipeline poses a threat; if the pillars are erected under the pipe gallery, it will affect the construction of the tunnel roof and the laying of waterproof materials, and it is also difficult to adjust the deformation of the pipe gallery according to the detected displacement of the pipe gallery; the traditional reinforcement measure is to erect Bailey beams above the pipe gallery , to pull the suspended pipe gallery, but the Bailey beam occupies a large space, which is not conducive to earthwork backfilling

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