Pressure-adjustable grouting system and grouting method based on special grouting moving cavity

Abstract

The invention discloses a pressure-adjustable grouting system and grouting method based on a special grouting moving cavity, and relates to the technical field of grouting. The grouting system comprises a main grouting pipe and a plurality of grouting valve pipes connected to the main grouting pipe, wherein each grouting valve pipe is located in an annular space in the wall of a drill hole, each grouting valve pipe comprises a grouting valve pipe body, and a guniting valve port is formed in each grouting valve pipe body; and a grouting pipe, an air injection pipe and a movable piston are arranged in each grouting valve pipe body, the air injection pipes are connected with the movable pistons, air pressure is applied into the movable pistons through the air injection pipes, the movable pistons generate volume expansion after the air pressure is applied, therefore closed cavities are formed between the lower portions of the movable pistons and the grouting valve pipe bodies, and groutingis conducted in the grouting valve pipe bodies according to the positions of the movable pistons. According to the grouting system, pressure adjustment can be conducted on a single grouting valve pipe, so that special grouting is conducted on different target layers, and the on-site construction efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of grouting, in particular to a grouting system and a grouting method based on an adjustable pressure of a special grouting moving chamber. Background technique [0002] In foundation treatment engineering, pressure grouting has become a more conventional method, and pressure control in the process of grouting has become a difficult point in the project. Because the pressure control value is closely related to the geological conditions and the buried depth of the grouting port, this poses an extremely severe challenge to the pressure control of the single-pipe grouting. With conventional grouting pipes, the grouting pressure in a single pipe is consistent, and it is difficult to achieve different pressures at different depths, or different pressures in different geological soil layers. [0003] In the grouting foundation treatment process, the treatment effect and project construction cost largely depend on...

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Problems solved by technology

[0004] The existing grouting pipe and the grouting valve pipe can only control the grouting pressure alone, which cannot meet the control of different grouting pressures for different depths and different geological soil layers. Most of the existing grouting pipes and a single grouting valve are used. Grouting the soil layers at different depths will result in an increase in the number of perforations and grouting pipes, delaying the construction period and increasing the construction cost

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