Improved construction method for shield tunnel segment caulking

Abstract

The invention provides an improved construction method for shield tunnel segment caulking. According to the improved construction method, the waterproof effect of a shield tunnel is guaranteed by sticking the slurry dipping cloth to gaps between segments, the waterproof grade of the shield tunnel can reach the grade I through a matching mode and a spraying mode of the slurry dipping cloth and guniting coating, and the technical requirement and the quality requirement of the shield tunnel are met. The waterproof performance of the shield tunnel is greatly improved, and the service life of the shield tunnel is greatly prolonged. Compared with a traditional segment caulking construction method, the improved construction method is simpler and higher in waterproof grade, and is one of the effective methods for solving or improving the waterproof grade of the shield tunnel and guaranteeing driving safety in the shield tunnel at present.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to an improved construction method for segment caulking of shield tunnels. Background technique [0002] After the shield tunneling construction is completed, the construction method of filling the gaps between segments with cement mortar or high modulus polyurethane sealant is called segment caulking. [0003] In the caulking construction of segments using cement mortar or high-modulus polyurethane sealant, first insert the PE isolation film into the gap between the segments, then insert the mixed cement mortar into the gap between the segments and combine with the PE isolation film Closely adhere, and finally smooth the plugged cement mortar and the surface of the segments; if the gap between the segments is a deformation joint, after the PE isolation film is plugged, insert the foam into the gap between the segments and the foam and The PE isolatio...

AI Technical Summary

Problems solved by technology

[0006] 1. The shield tunnel in the soft soil area will continue to deform after the construction is completed. The deformation usually occurs for a long time. The mortar or polyurethane used for segment caulking has a very low elongation rate, and a small deformation will Causes it to break, resulting in water leakage from the gaps in the segment, affecting the safety of the tunnel structure

[0007] 2. Water leaks in the gaps between the segments at the top of the tunnel will cause damage to power facilities such as catenary and cause accidents

[0008] How to eliminate and solve the above-mentioned reasons is one of the common research topics in this field, but so far, no research results have been seen to solve the above-mentioned reasons