Flame correction analysis of tunnel boring machine shield body roundness

Abstract

Tunneling boring machine is a kind of special construction machinery suitable for underground excavation, mainly composed of cutter head, shield body, screw conveyor, supporting system and so on, mostly used in modern infrastructure construction. Shield body is the key accessory of tunnel boring machine which plays an important role in excavation. Its roundness affects the progress and smoothness of construction directly, so it is of great significance to analyze roundness correction technology. Due to the large self-weight of shield body and influence of irregular welding deformation, it is difficult to make roundness under control in ideal state through existing manufacturing process. The out-of-tolerance part should be corrected after welding. Flame correction is a convenient technology to correct welding deformation which apply to roundness correction of shield body. This paper mainly expound and analyze shield body compositions, difficulties of roundness control and key technical points of flame correction.