大直径泥水盾构盾尾变形修复可行性分析及过程

Feasibility and Process Analysis of Repairing Deformation of Shield Tail of Large-diameter Slurry Shield Tunneling

为解决盾尾底部变形问题,本文详细分析造成变形的原因,制定修复方案并使用有限元模拟验证方案可行性。通过修复方案表明:(1)盾尾开窗清理异物并加热盾尾钢板千斤顶复位的修复方式可行;(2)在加热700℃的条件下,使用千斤顶即可将最大变形量为19.9cm的外板恢复原位且反力架可以承受150t的反力;(3)随着现有盾构机尺寸增大,大型金属加工件不可避免存在应力集中问题,在今后的盾构机生产制造过程中宜加强关注。

In order to solve the deformation problem of the shield tail bottom,the causes of deformation are analyzed in detail,the repair scheme is formulated,and the feasibility of the scheme is verified by finite element simulation.The repair scheme shows that:1)the repair method of opening the window at the shield tail to clean up foreign matters and heating the shield tail steel plate Jacking to reset is feasible;2)Under the condition of heating 700℃,the outer plate with the maximum deformation of 19.9cm can be restored to its original position by using the jack,and the reaction frame can bear 150t reaction force;3)With the increase of the size of the existing shield machine,the stress concentration problem of large metal workpieces is inevitable,which should be paid more attention in the production and manufacturing process of shield machine in the future.