Post-hardenable grout for shield tunnel wall and preparation method thereof

Abstract

The invention discloses back hardenable slurry of a shield tunnel and a preparation method thereof and belongs to the field of slurry of grouting engineering. The slurry contains the following raw materials in parts by weight: 7-12 parts of cement, 17-23 parts of sand, 19-21 parts of water, 34-40 parts of coal ash, 3-4 parts of sodium tripolyphosphate, 13-15 parts of phosphorus slag micropowder, 2-3 parts of sodium hydroxide, 0.3-0.5 part of a water reducer, 7-11 parts of calcium chloride and 0.5-0.7 part of a saline coupling agent. The slurry disclosed by the invention is high in strength, the strength within 7 days can reach 7.71MPa, the thickness of the slurry is greater than 11.2cm, the inundation rate is small (2.7-3.5%), the volume shrinkage is small, and the slurry has high fluidity, and sedimentation in a later period of the ground can be effectively controlled, so that the back grouting construction is more convenient; the raw materials required by the slurry are rich in source, low in price and convenient to construct and manage, and the automatic technical requirement on construction can be met.

Description

technical field [0001] The invention relates to the field of tunnel engineering grouting grout, in particular to a post-hardenable grout for a shield tunnel wall and a preparation method thereof. Background technique [0002] Nowadays, more and more urban underground projects and cross-river and sea-crossing tunnels use shield construction. During construction, the shield machine is pushed forward, and the assembled segment is pushed out of the shield tail by the jack, and a hole appears on the back of the segment. In the gap of the building, the synchronous grouting of the shield machine has become an indispensable part of the shield machine. In order to control the deformation of the ground, the purpose of controlling the bottom settlement and stress release has been achieved by injecting grout into the building gap at the tail of the shield. How to minimize the settlement of the ground surface and prevent the adjacent buildings from being endangered by excessive settlemen...

AI Technical Summary

Problems solved by technology

Due to the need to manage two liquids at the same time during construction, the process is complicated, the grouting pipeline is easy to be blocked, the cleaning is difficult, the adaptability is poor, and the technical content is high. Therefore, single grout is preferred in construction.

The existing domestic single slurry is mainly composed of cement, fly ash, sand, water, etc. There are common problems such as easy segregation of slurry, poor dispersion, low strength in the later stage, and easy blockage of pipelines. Solving this problem is an important issue for preparing high-quality single slurry. breakthrough