Coal Engineering ›› 2024, Vol. 56 ›› Issue (4): 45-52.doi: 10. 11799/ ce202404007

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Research on the support technology of jacking trapezoidal concrete-filled steel tube support

  

  • Received:2023-09-03 Revised:2023-12-25 Online:2023-04-20 Published:2024-12-09

Abstract:

Baijigou Coal Mine adopts stratified mining,and the transport roadway of 0102303 working face is situated beneath the goaf. The roof of the construction channel is a metal mesh false roof,and the original support is seriously deformed due to the disturbance of the upper stratified goaf. For this purpose,the jacking trapezoidal concrete-filled steel tube support is designed,and the jacking performance of various types of supports was tested through grouting jacking test. The test results showed that the grouting effect of Φ194mm×10mm steel pipe was good,and the jacking force reached 3.93kN,which met the requirements of the jacking of the support and the initial support of the tunnel false roof. In order to increase the bending strength of the steel pipe beam,the bending round steel is set in the hollow steel pipe,and the calculated support reaction force is 2.3MPa,which is 5.4 times higher than the original support method. At the same time,in order to solve the installation difficulties of various kinds of supports in the roadway,a lifting bracket installation machine has been designed,and the lifting force can reach 6.8kN. After 30 days of grouting,the basic area of the support load is stable, and the maximum value of the support load within half a year of installation is 0.8MPa. The on-site monitoring shows that the top and bottom moving in and the convergence of the two sides are less than 50mm,and the supporting effect is good.

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