Control device and method of pipe gallery deformation in soft soil foundation pit excavation process

Abstract

The invention relates to a protective scheme pipe gallery of deformation of a structure under foundation pit engineering, in particular to a control device and method of pipe gallery deformation in the soft soil foundation pit excavation process. According to the key points, an uplift pile is adopted to provide an uplift control mode, a mode that a back pressure system composed of a counterforce support cross beam, longitudinal stabilized steel beam and an advanced support steel tube is combined with a balance weight unit to provide coping balance weight control mode is adopted, a 'dual insurance' control mode of uplift and balance weight coping is achieved, deformation of the pipe gallery is effectively controlled in real time, engineering accidents are avoided, the safety of the lower layer pipe gallery structure and other underground structure is guaranteed, the uplift pile and the back pressure system in the control method can be recycled, the construction cost is lowered, and green environmental protection engineering is achieved.

Description

technical field [0001] The invention relates to a pipe gallery protection scheme for the deformation of the structure below the foundation pit engineering, in particular to a pipe gallery deformation control device and control method during the excavation of the soft soil foundation pit, and is especially suitable for the distance between the existing pipe gallery structure and the bottom of the foundation pit. Less than 1 times the outer diameter of the pipe, the protection of the pipe gallery project that is sensitive to excavation. Background technique [0002] In the construction of foundation pit engineering, there are often multiple structures or pipe galleries on the vertical plane. During actual construction, the shallow (upper) structures may be completed first, and then the deep (lower) structures are completed. Construction, and this construction method of first going up and then down needs to protect the superstructure first, such as in-situ protection of pipelin...

AI Technical Summary

Problems solved by technology

According to the principle of foundation pit engineering, during the excavation and unloading process of the foundation pit, the foundation soil at the bottom of the foundation pit will rebound due to the excavation and unloading of the upper soil body, causing the bottom of the foundation pit to bulge and deform. When there is a pipe gallery or other structures at the bottom, there will be a problem that the pipe gallery or other underground structures will rise and deform together with the soil layer. When the deformation exceeds the deformation allowable value of the structure, a large engineering accident will occur and affect the foundation. Safety of pipe gallery structure or other underground structures under the pit

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