Construction method of demolition and safety force transfer for tunnel initial support deformation clearance interfering section

Abstract

The invention discloses a construction method of demolition and safety force transfer for a tunnel initial support deformation clearance interfering section. The construction method comprises the steps that 1, grouting reinforcement of an arch wall is performed, specifically, an arch wall of the tunnel initial support deformation clearance interfering section is subjected to grouting reinforcement; 2, construction section division is performed, specifically, the tunnel initial support deformation clearance interfering section is divided into a plurality of construction sections from the rear to the front in the extension direction of a tunnel, and the construction sections comprises first-stage construction sections or second-stage construction sections and the first-stage construction sections and the second-stage construction sections are distributed in a staggered mode; 3, temporary concrete lining construction is performed, specifically, a temporary concrete lining is constructed in each second-stage construction section; 4, the construction of the demolition of initial supports and the safety force transfer of the first-stage construction sections is performed; and 5, the construction of the demolition of the initial supports and the safety force transfer of the second-stage construction sections is performed. According to the construction method of the demolition and thesafety force transfer for the tunnel initial support deformation clearance interfering section, surface support is realized by temporary support of the temporary concrete linings, the reinforcement strength is large, the safety risk is greatly reduced, and multiple working faces can be synchronously subjected to the construction of the demolition of the initial supports and the safety force transfer; and the construction progress is great and the construction process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for dismantling the deformed and restricted section of the primary support of the tunnel and converting it safely under stress. Background technique [0002] Tunnel is a form of human use of underground space, and it is an engineering building buried in the ground. During the tunnel construction process, it is necessary to support the excavated tunnel hole in time. The tunnel support includes initial support and post support and consists of Picture 1-1 The tunnel composite lining structure shown. The tunnel composite lining structure includes a tunnel primary support structure and a tunnel secondary lining 1 located inside the tunnel primary support structure, and the tunnel primary support structure is a tunnel supporting the arch wall of the tunnel hole 2 The primary support structure, the tunnel secondary lining 1 is a concrete l...

AI Technical Summary

Problems solved by technology

This method has a large amount of reinforcement work, and the temporary support process is cumbersome, and its reinforcement method is point support. When the arch is replaced, it is easy to cause the movement failure of the horizontal and vertical supports. In addition, the sequence of arch replacement is restricted, and the construction of the arch replacement and the front of the tunnel It cannot work at the same time, which has the disadvantages of restricting the construction progress and low work efficiency

Moreover, it is very difficult to strengthen the horizontal and vertical braces on the whole section, and it will bring restrictions on the next step of disassembly and replacement. If there is a little carelessness, the temporary braces will loosen and fail, and the reinforcement will not be effective, and the risk of local collapse will increase.

Images