Structural Design and Optimization of the Pipe Section of the Coal Roadway Spiral Pipe Jacking Machine

PENG Jun; LIU Yu; DUAN Kaiyuan

doi:10.16545/j.cnki.cmet.2025.06.005

Abstract：Addressing the issue of the inapplicability of socket-and-spigot concrete pipes in the construction of new coal roadway crossings using the hole-in-place spiral jacking method in coal mine shafts,a new pipe joint structure tailored for spiral transportation was designed,satisfying three core requirements.Firstly,providing effective thrust transmission for the tunneling machine.Secondly,achieving synchronous and reliable support underground.Thirdly,eliminating the risk of spiral friction sparks through wear-resistant coatings on the inner wall,while optimizing the connection method to enhance construction efficiency.The design incorporates a rapid end flange connection,optimizes the structure of the connection part,and adds grouting holes to minimize the interference of bench coal accumulation on propulsion.Based on ANSYS finite element analysis software and combined with the spiral jacking construction process,the mechanical properties of the pipe joint under different working conditions were simulated,and the optimal structural solution was determined through parametric analysis.The designed new pipe joint structure meets the expected goals in terms of thrust transmission,support stability,and wear resistance and explosion prevention.The flange connection and grouting hole design significantly reduce the propulsion resistance caused by coal accumulation.The finite element analysis results showed that the structure had high safety and adaptability under complex loads,while also being economical.The proposed pipe joint structure effectively addresses the limitations of traditional pipes in the spiral jacking process.Through mechanical optimization and process adaptation,it significantly improves tunneling efficiency and provides reliable technical support for efficient and safe construction in coal mine shafts.