A construction method for strengthening existing subway tunnel structures with high-performance composite mortar

Abstract

A construction method for reinforcing existing subway tunnel structures with high-performance composite mortar, which uses lining mortar, and the paste-like material obtained after fully mixing the lining mortar and water according to the mass ratio of 1: (0.4-0.6) is the composite mortar ; The construction method comprises the following steps: 1) setting up temporary scaffolding; 2) chiseling and high-pressure water cleaning of segment rings to be repaired; 3) planting bars or playing expansion screws; 4) binding and installing steel mesh; 5) painting the interface 6) Mortar spraying: The spraying process is completed in two steps: the first pass of spraying makes the mortar fully cover the steel mesh, and artificial leveling; the second pass of spraying to the predetermined thickness; 7) Mortar curing. The invention provides a construction method for reinforcing existing subway tunnel structures with high-performance composite mortar with simple steps, reasonable design, convenient construction, good construction effect, effective repair of damaged segments, short cycle and low cost.

Description

technical field [0001] The invention relates to a construction technology of a subway tunnel structure, in particular to a construction method for reinforcing an existing subway tunnel structure. Background technique [0002] In recent years, with the large-scale construction of urban subways and related municipal projects, shield tunnels have been used more and more in China. The structural strength of the segment is an important part of the shield tunneling project. During the construction, according to the characteristics of the shield tunneling project, the segment is prone to quality problems such as damage, chipping, and large-scale cracking and exposed ribs during the construction process, which will affect the quality of the tunnel. Subsequent operations will cause greater security risks. [0003] The main causes of damage to tunnel segments are collisions during hoisting or horizontal transportation; improper control of shield attitude during shield excavation; vio...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing segment reinforcement technology, such as poor pertinence, easy fall-off of reinforced steel pipe segments, and lack of reinforcement strength, the present invention provides a method with simple steps, reasonable design, simple construction, good construction effect, and can prevent damage to segments. A construction method for strengthening existing subway tunnel structures with high-performance composite mortar for effective repair, short period and low cost

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