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<p>This study investigated the dual functions of drilling and freezing in municipal freezing projects through bending and torsional tests and mechanical analysis of integrated freezing pipes. The research examined the impact of various connection methods, welding rod types, and moist environments on freezing pipe performance. The results indicated that the third connection method featuring a 1&#xa0;mm wide and 2&#xa0;mm high step at the bottom of the internal and external threads, with a 2-mm gap after the bevel butt joint combined with the J427 welding rod, demonstrated optimal mechanical properties. This configuration improved the bending performance by 6.21–12.08% and torsional performance by 3.71–3.92%, whereas the J427 welding rod further enhanced the bending performance by an additional 3.18%, thereby increasing the load-bearing capacity and reducing the deformation under external loads. However, welding under wet conditions significantly decreased the mechanical properties, particularly the torsional performance, which decreased by 4.37 and 13.43%, respectively. These findings offer a scientific foundation for the design and material selection of freezing pipes, ensuring their suitability for both drilling and freezing applications and providing practical guidance for freezing reinforcement in underwater tunnel docking projects.</p>

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Experimental Study on Mechanical Properties of Freezing Pipe Connection Forms in Freezing Reinforcement Engineering of Underwater Tunnel

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Bin Wang,
  • Zihao Zhang,
  • Xiuling Liang,
  • Liangtao Yan,
  • Chuanxin Rong,
  • Siwei Miao

摘要

This study investigated the dual functions of drilling and freezing in municipal freezing projects through bending and torsional tests and mechanical analysis of integrated freezing pipes. The research examined the impact of various connection methods, welding rod types, and moist environments on freezing pipe performance. The results indicated that the third connection method featuring a 1 mm wide and 2 mm high step at the bottom of the internal and external threads, with a 2-mm gap after the bevel butt joint combined with the J427 welding rod, demonstrated optimal mechanical properties. This configuration improved the bending performance by 6.21–12.08% and torsional performance by 3.71–3.92%, whereas the J427 welding rod further enhanced the bending performance by an additional 3.18%, thereby increasing the load-bearing capacity and reducing the deformation under external loads. However, welding under wet conditions significantly decreased the mechanical properties, particularly the torsional performance, which decreased by 4.37 and 13.43%, respectively. These findings offer a scientific foundation for the design and material selection of freezing pipes, ensuring their suitability for both drilling and freezing applications and providing practical guidance for freezing reinforcement in underwater tunnel docking projects.