Waterproof grout material behind GIL (gas-insulated line) utility tunnel and grouting method of grout material

Abstract

The invention relates to a waterproof grout material behind a GIL (gas-insulated line) utility tunnel. The waterproof grout material behind the GIL utility tunnel is prepared in steps as follows: S1, screening: natural fine sand with the fineness modulus in the range of 2.2-3.0 is selected as aggregate; S2, drying: the aggregate screened out in S1 is dried until the water content is smaller than 6%; S3, material blending: components including 70%-75% of the aggregate in S2, 10%-12% of I type portland cement, 3%-3.5% of bentonite, 5%-6% of filler, 5%-6% of a waterproof emulsion and 0.2% of a stabilizer are added and blended; S4, premixing: a proper amount of water is added to the material in S3 in the water to material mass ratio of smaller than or equal to 0.4; S5, stirring: the mixture is stirred in a stirrer for 5-10 min until the mixture is uniformly stirred; S6, filling: the uniformly stirred slurry is injected into a slurry pool for later use. The grout material has the advantages of a support function and very good water resistance.

Description

technical field [0001] The invention relates to the construction field, in particular to a waterproof grouting material and a grouting method for the back of a GIL comprehensive pipe gallery. Background technique [0002] GIL (Gas-insulatedLine) is a gas-insulated metal-enclosed transmission line, which uses metal conductive rods to transmit electricity, and seals them in a grounded metal shell and insulates them through pressure gas. Compared with conventional cables, GIL has significant advantages such as large transmission capacity, low loss, no environmental influence, high operational reliability, and space saving. It is especially suitable as a supplementary transmission technology for overhead power transmission or limited cable power transmission. . During the construction of the gas-insulated metal-enclosed transmission line, when the shield tail comes out of the assembled shield segment, it will inevitably cause a building gap between the segment lining and the so...

AI Technical Summary

Problems solved by technology

During the construction of the gas-insulated metal-enclosed transmission line, when the shield tail comes out of the assembled shield segment, it will inevitably cause a building gap between the segment lining and the soil. Tail grouting to prevent the loosening of the soil around the shield segment and at the same time protect the overall pipe gallery from the water. The grouting material is filled into the gap behind the tail of the shield, and after it hardens, it can fill the gap behind the wall and provide a certain strength and waterproof ability. This is a grouting method for stabilizing the pipe gallery. Traditional grout cannot be waterproof, The three aspects of support and filling are balanced, so this type of waterproof grout needs to be specially prepared to achieve the above effects