Cement mortar for filling freezing pipes and freezing pipe filling technology

Abstract

The invention discloses a cement mortar for filling freezing pipes. The cement mortar comprises a calcium chloride water solution, cement, clay powder, and cellulose; wherein the weight ratio of the calcium chloride water solution to cement is 0.8-1:1, the added clay powder accounts for 1 to 3% of the weight of the cement, and the added cellulose accounts for 0.1 to 0.5% of the weight of the calcium chloride water solution. The invention also provides a freezing pipe filling technology adopting the provided cement mortar. The technology comprises the following steps: preparing for mortar filling, preparing cement mortar for filling freezing pipes, filling the cement mortar into freezing pipes, and recovering the liquid feeding pipes. The provided cement mortar has an anti-freezing property, the freezing point of the cement mortar can reach -30 to -40 DEG C; so the cement mortar can be filled into the freezing pipes in a negative temperature environment after the shaft freezing engineering is finished, thus the operation time can be saved, furthermore, the initial setting time of the cement mortar is proper, and the uniaxial compressive strength can reach 4.875 MPa after moulding.

Description

technical field [0001] The invention relates to the field of freezing method construction, in particular to a cement slurry for filling frozen pipes and a filling process for frozen pipes. Background technique [0002] The artificial freezing method is the main special drilling method for coal mine construction in my country. Usually, it uses a brine (refrigerant) circulation system to continuously transport the cold energy produced by the ground refrigeration station to the ground, and then the freezing pipe and the soil (rock) layer Heat exchange is carried out, and a temporary enclosure structure for wellbore construction, that is, a freezing wall, is formed around the freezing pipe. With the advancement of freezing technology, the freezing depth of the wellbore is also increasing. The freezing pipe must not only pass through the unstable water-bearing surface strata, but also pass through broken rock formations, water-bearing rock formations, and the horse head gate of th...

AI Technical Summary

Problems solved by technology

With the advancement of freezing technology, the freezing depth of the wellbore is also increasing. The freezing pipe must not only pass through the unstable water-bearing surface strata, but also pass through broken rock formations, water-bearing rock formations, and the horse head gate of the wellbore. The holes and pipes may become the upper and lower water guide channels in the formation outside the wellbore in the future, which will pose a threat to the safety of the wellbore

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