A double-liquid grouting construction method

Abstract

The invention discloses a double-liquid grouting construction method, which is characterized by comprising the following steps: 1) installing a first grouting pipe and at least one second grouting pipe at a place to be grouted; Inject the grout into the first grouting pipe, stop grouting when the grout overflows from the mouth of the first grouting pipe, and then pour the grout into the second grouting pipe after the grout is in a gel state; 3) When the grouting flow in the second grouting pipe reaches 15L / min~20L / min, the grouting is continued after 5min~10min, and then the grouting is stopped. This method can not only quickly reinforce the area with low soil strength, but also the mechanical strength of the reinforced soil body is uniform, and the soil body can maintain self-stable after excavation, which meets the construction safety requirements.

Description

technical field [0001] The invention relates to a grouting method, in particular to a double-liquid grouting construction method. Background technique [0002] With the rapid expansion of cities and increasingly busy traffic, some cities have begun to build rail transit to ease the pressure of increasingly congested traffic. [0003] In the construction of rail transit, shield machines are often used for excavation to improve work efficiency. However, in some specific areas, for example, there are steel strands inserted during anchor cable construction in the ground in the area, or areas with low soil mechanical strength cannot be directly excavated. For areas with low soil mechanical strength, grouting is usually used. The traditional grouting method is to directly pour cement slurry into the soil for reinforcement. The gelation time of single-liquid slurry is generally 8 hours, and the gelation time of some double-liquid slurry is 30 minutes. For urgent construction task...

AI Technical Summary

Problems solved by technology

In some specific areas, for example, there are steel strands placed in the anchor cable construction in the strata in the area, or areas with low soil mechanical strength cannot be directly excavated. For areas with low soil mechanical strength, grouting is usually used. The traditional grouting method is to directly pour cement slurry into the soil for reinforcement. The strength of the soil after reinforcement by this method is different, showing that some places have high strength and some places have low strength.

The gel time of single-liquid slurry is generally 8 hours, and the gel time of some double-liquid slurry is 30 minutes. For the urgent construction task, it is difficult to speed up the construction period

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