Shield synchronous grouting

Abstract

The invention discloses shield synchronous grouting. The shield synchronous grouting is prepared from the following components in parts by weight: 100-150 parts of cement, 600-700 parts of sand, 150-210 parts of flyash, 30-35 parts of heavy calcium powder, 1-1.5 parts of cellulose ether, 40-50 parts of sodium-based bentonite, 20-40 parts of admixture, 10-20 parts of desulphurization gypsum powder,550-650 parts of water, 20-30 parts of silicate powder and 10-20 parts of lime. The slurry prepared with the shield synchronous grouting has high flowability and shrinkage resistance and favorable stability and cohesion, is injected into stratum through a shield support ring and a shield tail inner pipeline system, heavily uses industrial waste of flyash at the same time, and is environmentally friendly. 42.5 R ordinary silicate cement is adopted as a synchronous grouting material to improve corrosion resistance of a grouting stone body, enable a pipe segment to be coated by corrosion-resisting grouting stone body, reduce the corrosion of ground water on pipe segment concrete, and fill an annular gap as soon as possible. Therefore, the pipe segment supports the stratum as early as possible, and deformation of the ground is prevented from being too great to endanger surrounding environment.

Description

technical field [0001] The invention relates to the technical field of tunnel grouting, in particular to a shield synchronous grouting. Background technique [0002] Shield synchronous grouting is applied while the shield tunnel is advancing, and its main function is to control the settlement of the ground and protect the tunnel from displacement. When the scutellum is separated from the shield tail, a circular gap with a width of about 3.5 mm will be formed between the soil body and the segment. The purpose of synchronous grouting is to fill the annular gap as soon as possible so that the segments can support the formation as soon as possible, prevent the ground from being deformed too much and endanger the safety of the surrounding environment, and at the same time act as a waterproof and structural reinforcement layer outside the segments. The problem is that the fluidity and shrinkage resistance of the slurry are insufficient, and the stability and consolidation are not...

AI Technical Summary

Problems solved by technology

The purpose of synchronous grouting is to fill the annular gap as soon as possible so that the segments can support the formation as soon as possible, prevent the ground from being deformed too much and endanger the safety of the surrounding environment, and at the same time act as a waterproof and structural reinforcement layer outside the segments. The problem is that the fluidity and shrinkage resistance of the slurry are insufficient, and the stability and consolidation are not enough, so that it can not be well injected into the formation through the shield support ring and the inner pipeline system of the shield tail. The use of materials has not taken into account environmental protection and energy saving , so it is imperative to realize a shield synchronous grouting that can solve such problems