Safety and Rapid Construction of Large Diameter Mine Freezing Shaft
YANG Dong-bing
JIANG Jun
Abstract：No.2 mine auxiliary shaft of Nalinhe Mine had a net diameter of 10.5m ,a max excavation di-ameter of 15.5m ,a shaft depth of 583.95m and a freezing depth of 521m.In the main freezing borehole of the mine shaft ,a retarded cement grout was applied to the consolidation of the pipe and the water sealing ,to the sealing of the vertical water flow channel in the freezing borehole in order to eliminate the water flow of the freezing borehole and the danger to the mine safety after the thawing of the freezing wall of the mine shaft.During the mine shaft sinking period ,a dual umbrella drilling frame was applied to the rock drilling.The drilling frame successfully solved a difficult problem of a full sec-tion one drilling and blasting for the large diameter shaft and the rock drilling efficiency was improved by 40% .A circulation time was reduced ,the construction schedule was speeded up and there were three months that a month excavation and lining of the mine shaft was reached or over 100m.In addi-tion ,a heat supply in the winter season could ensure the project quality and a successful construction and would be one successful experience.
Keywords：large diameter mine shaftfull depth freezing methodretarded cement groutdual umbrella drilling framerapid construction
Publication Date：2014-04-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 10-13 )