New Automatic Pouring and Vibrating Techniques for the Construction of Railway Tunnel Lining
(1. China State Railway Group Co., Ltd., Beijing 100844; 2. HuaiShaoHeng Railway Co., Ltd., Changsha 410008; 3. China Railway Tunnel Group Co., Ltd., Guangzhou 511457)
Abstract：
Defects caused by quality problems of railway tunnel lining, such as cavity behind lining, cracking, and spalling etc., could lead to great threats to the normal operation of the railway, and concrete pouring and vibration is the key to ensuring the quality of tunnel lining. Therefore, this paper develops a new automatic pouring and vibrating technique for tunnel lining construction with the objective to improve the quality of tunnel lining. The study shows that for the window-by-window pouring technique with automatic rotary concrete distributors it needs only 3 to 4 minutes per change of the pipe, showing the characteristics of simple structure, convenient operation, excellent effect, safety and reliability, which not only speeds up the tunnel lining construction progress but also ensures the quality of the tunnel lining; for the new plug-in vibration technique with automatic lifting and plug-in vibration for the sidewalls and automatic pneumatic plug-in vibration for the vault, it can effectively improve the effect of concrete vibration; for the pressurized reverse pouring technique with 60° inclined holes at the tunnel vault, compared with traditional vault pouring methods, it shows a significant reduction in the number of pipe blocking and the number of deformation of formworks at pouring openings, while the quality of concrete pouring is significantly improved.
ZHANG Minqing1 JIA Dapeng1 WANG Shuishan2 GAO Cuncheng3
.New Automatic Pouring and Vibrating Techniques for the Construction of Railway Tunnel Lining[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 29-34
2022, Vol. 59 