A Y-shaped tunnel grouting structure and matching grouting method

Abstract

The invention belongs to the technical field of tunnel excavation, and specifically relates to a Y-shaped tunnel grouting structure and a matching grouting method, which successively include: a rock layer, a grouting layer and a segment layer from the tunnel rock layer, and the segment layer There are grouting holes on the layer, and the grouting holes are grouted outwards. The structure design is reasonable. Two kinds of grout are sprayed through the Y-shaped grouting port, which are respectively suitable for the top, side and bottom of the tunnel. Good effect and high efficiency. Through the Y-shaped grouting port, two kinds of grout are sprayed upward and downward respectively. The upward spray is a slurry mixed with mortar and water glass. It has the characteristics of high viscosity and short setting time, and can effectively fill the segment. back, and quickly generate strength, which fixes the segment structure and effectively inhibits the segment from floating up. It can be carried out by relying on existing equipment, without increasing the cost of grouting, and the utilization rate of grout is high. Two grouting machines work at the same time. The time is short, and the grouting pressure can be monitored to ensure the quality of grouting.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a Y-shaped tunnel grouting structure and a matching grouting method. Background technique [0002] The shield tunneling method is often used in the excavation process of subway tunnels. It has the advantages of fast construction speed, no influence of seasons, and no impact on traffic. [0003] During shield construction, there are often gaps between the pipe layer and the rock-soil layer. In order to prevent surface subsidence, it is necessary to inject grout between the pipe layer and the rock-soil layer. In actual engineering, researchers have found that synchronous grouting cannot It effectively fills the gap at the back of the segment, but the grouting effect is poor, and the tunnel segment cannot be fixed in time, and the segment is prone to float up and damage the tunnel structure. [0004] The existing tunnel secondary grouting structure and method setting are ...

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Problems solved by technology

[0003] During shield construction, there are often gaps between the pipe layer and the rock-soil layer. In order to prevent surface subsidence, it is necessary to inject grout between the pipe layer and the rock-soil layer. In actual engineering, researchers have found that synchronous grouting cannot Effectively fills the gap at the back of the segment, but the grouting effect is poor, and the tunnel segment cannot be fixed in time, and the segment is prone to float up and damage the tunnel structure

[0004] The existing tunnel secondary grouting structure and method settings are not reasonable enough

Setting vertical grouting holes at 11 o'clock and 1 o'clock on the top of the segment for secondary grouting will result in gaps on the back of the segment and poor grouting effect; top grouting solves the problem of gaps on the back of the segment to a certain extent Problem, but during the grouting process, the grout gradually rises from the bottom to the top, so the buoyancy of the grout on the segment rises to a certain level before the upper half of the tunnel begins to have grout, so this grouting method cannot solve the phenomenon of the segment floating up ; Although the circumferential grouting method can restrain the segment from floating to a certain extent, its grouting efficiency is low and the construction process is cumbersome

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