铁路隧道衬砌施工工装工艺及信息化技术试验研究

Experimental Study on Tooling and Informatization Technology of Railway Tunnel Lining Construction

针对当前铁路隧道衬砌存在的拱顶脱空、施工缝处空鼓、混凝土开裂掉块、渗漏水等质量缺陷,对缺陷成因及工装工艺方面存在的不足进行简析。以张吉怀铁路吉首隧道为例,开展新型智能衬砌台车工装工艺及信息化技术研发和试验应用。提出分层自动浇筑、端头透明堵头板、拱顶斜孔浇筑、端头零搭接装置、加强型中埋式止水带等先进施工工装工艺。拱墙衬砌台车信息评估系统通过PLC智能集成台车浇筑状况、布料系统、拱顶自动振捣、拱顶空洞监测、端部搭接监测、侧部压力监测、液压系统、行走系统及衬砌数据报表,实现衬砌浇筑和质量控制实时可视化管控。通过现场试验和第三方检测验证,二次衬砌混凝土缺陷每250 m检测范围由31处减少至4处,混凝土强度提升约12%。

Considering the quality defects found in the lining of railway tunnels, such as crown voids, construction joint hollow, cracking and chipping of concrete, and water leakage, an investigation is conducted into the causes of these defects and the shortcomings in the tooling technology used. A new intelligent lining trolley tooling and informatization technology is developed and tested in a case study on the Jishou tunnel of the Zhangjiajie-Jishou-Huaihua railway. A series of advance construction tooling technologies, including layered automated pouring, transparent end cap plates,inclined holes for pouring into the crown, end zero overlapping devices, and reinforced medium buried water-stop ties,are proposed. The arch-wall lining trolley information evaluation system intelligently integrates the trolley pouring status,the distribution system, automated vibration of the arch crown, arch crown cavity monitoring, end lap monitoring, sidepressure monitoring, the hydraulic system, the traveling system, and the lining data report using a programmable logic controller, to enable real-time visual control of the lining pouring process and its quality control. Field testing and the third-party inspection indicated that secondary lining concrete defects decreased from 31 points to 4 points within 250 m,and the concrete strength was strengthened by about 12%.