Foundation pit supporting method used below existing comprehensive pipe rack

Abstract

The invention discloses a foundation pit supporting method used below an existing comprehensive pipe rack and relates to existing comprehensive pipe racks and to-be-built tunnel box culverts crossed below the existing comprehensive pipe racks. The foundation pit supporting method is characterized by comprising the following steps: at the crossed position, at least one working well is arranged on each of two sides of a comprehensive pipe rack, a longitudinal pipe-roof is arranged in each of the working wells, and a horizontal pipe-roof is arranged at the bottom of each of the working wells, and the longitudinal and horizontal pipe-roofs are jacked into soil between the working wells on the two sides in the longitudinal direction of the to-be-built tunnel box culvert; after that, the to-be-built tunnel box culvert is constructed. The foundation pit supporting method has the advantages that the construction environment is good, the risk is relatively low, the deformation is controllable, and influence on the existing comprehensive pipe rack above is avoided.

Description

technical field [0001] The invention belongs to the technical field of underground cavern construction, and in particular relates to a foundation pit support method at the lower part of an existing comprehensive utility gallery. Background technique [0002] The comprehensive pipe corridor refers to the construction of a tunnel space underground in the city, and the centralized laying of various municipal pipelines such as electricity, communications, water supply and drainage, and gas. It avoids the trouble of repeated excavation of the road surface due to burying or repairing the pipeline, avoids the corrosion of the pipeline by the soil, and prolongs the service life of the pipeline. [0003] When constructing tunnel box culverts under the existing comprehensive pipe gallery, it is required that the comprehensive pipe gallery is not allowed to be relocated. Under normal circumstances, the construction methods that can be used in soft soil include: underground excavation ...

AI Technical Summary

Problems solved by technology

In general, the construction methods that can be used in soft soil are: underground excavation construction, box culvert jacking with pipe curtain support, etc. The construction environment of the underground excavation method is poor, the risk is high, and the deformation control is strict, while the box culvert The culvert jacking method requires a certain site and requires more equipment. Both of these two construction methods have problems such as long construction period and high cost.

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