Technological process of ground prefabrication and installation of inner shaft wall of freezing shaft

Abstract

A technological process of ground prefabrication and installation of an inner shaft wall of a freezing shaft comprises the following steps of performing prefabrication of a shaft wall; prefabricating the inner shaft wall on the ground at the same time of shaft excavation; performing installation of the shaft wall; performing welding assembly on annular U-section steel and rebar in a shaft wall body to enable the shaft wall body to form an integral structure after achieving prefabrication of the inner shaft wall; sinking the shaft wall; injecting counterweight liquid to a shaft after achieving masonry of an outer wall of the shaft to enable the prefabricated inner shaft wall to be slowly sunk and control the suspension height of the inner shaft wall in the counterweight liquid; installing the next section of the shaft wall and performing alignment when performing the installation of the shaft wall; performing welding after the alignment; performing wall backfilling; filling grouting in annular space between an inner wall and the outer wall into a plurality of stage heights from bottom to top; and performing consolidation to achieve shaft-forming. The technological process of the ground prefabrication and installation of the inner shaft wall of the freezing shaft has the advantages of reducing construction costs, saving construction time, speeding up the shaft-forming and guaranteeing the safety and reliability of the construction process.

Description

technical field [0001] The invention relates to the technical field of using a freezing method to construct shaft walls in the construction of mine shafts, in particular to a ground prefabrication and installation process for the inner shaft walls of frozen shafts in mine shafts. Background technique [0002] The vertical shaft shaft is the throat of the mine. In order to ensure safety, the shaft wall must be able to resist the effects of water pressure and formation deformation pressure, and must have good water sealing performance. [0003] At present, except for a few frozen wellbores in foreign countries, in the wellbore construction at home and abroad, one way is to use double-layer composite wellwall with plastic interlayer. This existing double-layer composite wellbore contains two layers inside and outside. Formation conditions, wellbore net diameter and buried depth, and the main factors affecting the thickness of the inner wellbore wall are the structure of the wel...

AI Technical Summary

Problems solved by technology

The disadvantage is that there are hidden dangers in the safety and waterproof performance of the single-layer well wall during use.

[0006] To sum up, the current frozen shaft walls mostly adopt double-layer shaft wall structure design, which has the defects of excessive thickness of the shaft wall and high construction cost. Moreover, after the construction of the inner casing wall is completed, the steel bars are bound according to the section height and Concrete pouring and other processes that need to be carried out simultaneously in the construction project take a long time

Images