Freezing method of frozen wall of inclined shaft

Abstract

The invention provides a freezing method of a frozen wall of a frozen wall of an inclined shaft, solving the problems of difficulty in digging in the construction because an aquifer of the inclined shaft is frozen and low construction speed and meeting safe and rapid construction requirements of the aquifer of the inclined shaft. The freezing method comprises the following steps of: drilling multiple rows of freezing holes which are parallel to each other and vertically distributed, on the group, along an axial freezing range of the inclined shaft, wherein the row number of the freezing holes is determined according to the cross section size of the inclined shaft and the required freezing time, the freezing holes at the lateral part and the freezing holes at the end part respectively go deep into a water-resisting layer in the depth, water in the aquifer at the lower part is isolated by the water-resisting layer, and the freezing holes at the top go deep into the top of the inclined shaft in depth; then arranging a freezing pipe and a liquid supply pipe in each drilled freezing hole, wherein the freezing pipe and the liquid supply pipe in each drilled freezing hole are communicated with an external freezing station; and finally, starting the freezing station and enabling low-temperature saline water prepared by the freezing station to flow in the each freezing pipe to absorb heat of the stratum around each freezing pipe to form a frozen cylinder, wherein all frozen cylinders are continuously enlarged and further connected to form the frozen wall which can resist earth pressure and water pressure.

Description

technical field [0001] The invention relates to the technical field of mine engineering, in particular to a method for freezing frozen walls of inclined shafts. Background technique [0002] Freeze sinking is to use artificial refrigeration to freeze the water-bearing strata around the inclined shaft into a closed and impermeable frozen wall before the inclined shaft is excavated, which is used to resist ground pressure, water pressure, and isolate the gap between groundwater and the inclined shaft. Contact, and then carry out excavation construction under its protection. In order to form the frozen wall, a certain number of boreholes are first drilled around the inclined wellbore to be excavated, and a frozen pipe with a bottom cone is installed in the hole. The low-temperature brine produced by the freezing station flows in the freezing pipe, absorbs the heat of the formation around the pipe, and forms a freezing cylinder. With the continuation of the freezing work, the ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the above-mentioned technical problems, the present invention provides a method for freezing the frozen wall of an inclined shaft to solve the problems of difficult excavation

Images