Construction method for deformation control over existing operation tunnel crossing under shield

Abstract

The invention discloses a construction method for deformation control over an existing operation tunnel crossing under a shield. A construction tunnel is a shield tunnel of an under-crossing existing operation tunnel. A tunnel segment of the under-crossing existing operation tunnel is an under-crossing segment. The process of constructing the under-crossing segment comprises following steps: 1, reinforcing a steel ring of the operation tunnel; 2, laying distortion monitoring points of the existing operation tunnel; 3, determining reference values of guiding construction parameters based on shield construction of a test section; 4, determining parameters for guiding construction of the under-crossing segment: determining parameters for guiding construction of the under-crossing segment based on reference values of guiding construction parameters; 5, carrying out shield construction of the under-crossing segment; 6, after under-crossing construction, supplementing and grouting in phases: supplementing and grouting the under-crossing segment based on a monitoring result and by means of grouting holes in shield tunnel segments.The construction method for deformation control over the existing operation tunnel crossing under the shield has following beneficial effects: the construction method has simple processes and is reasonably designed; construction is performed easily and conveniently; a fine construction effect is obtained; and effective control over distortion of the existing operation tunnel crossing under the shield is achieved in a short period at low cost.

Description

technical field [0001] The invention belongs to the technical field of tunnel shield construction, and in particular relates to a construction method for deformation control of a shield passing under an existing operating tunnel. Background technique [0002] The impact of shield tunneling on the surrounding environment is mainly manifested in the ground subsidence caused by shield tunneling. When the surface settlement is too large, it will affect the normal use and safe operation of shield tunnels and surface buildings, especially in the construction of subways in cities with dense buildings, roads, and underground pipelines. The surface settlement caused by tunnel construction should attract more attention . In actual surface subsidence monitoring, the surface subsidence monitoring system is used for monitoring, and ground monitoring conditions are required. Specifically, the surface subsidence monitoring system can be arranged on the ground in the monitoring area and mu...

AI Technical Summary

Problems solved by technology

[0004] Nowadays, when shield tunneling is carried out under the existing operating tunnel, the construction method of combining the steel ring reinforcement of the existing operating tunnel with the pre-grouting and pre-reinforcement of the crossing strata is usually adopted, but when this method is used for the underpassing construction , the construction process is complicated, the cycle is long and the cost is high

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