Up to now, the total investment of Yunyang section of Zhengzhou Wanzhou high speed railway has reached 58%

Overview: single tunnel, double track tunnel, 2257.95 meters in total length, design speed 350 kilometers per hour. Progress of

: after 847 days of fierce battle, the baotawan tunnel was successfully completed. A 6031 a 6031 Three Gorges media network (reporter Xu Zhiquan, correspondent Lei Ruxin, article / Figure) recently, the third work area of the project management department of Zhengzhou Wanzhou high speed railway Chongqing section of Shanghai Engineering Bureau of China Railway spread the quick report again. After 847 days of fierce day and night battle, the baotawan tunnel of Zhengzhou Wanzhou high speed railway was successfully completed. The

baotawan tunnel is a single hole double line tunnel with a total length of 2257.95 meters and a design speed of 350 kilometers per hour. Among them, grade IV and grade V surrounding rock accounts for 53%. The tunnel geology is complex, the minimum covering thickness is 52 meters, the maximum buried depth is 285m, and the maximum longitudinal slope is 30 ‰. The tunnel body passes through the fault zone three times. The surrounding rock fissures are developed, the surrounding rock grade changes rapidly, the construction risk is high, and the technical requirements are high. As the third work area of Zhengzhou Wanzhou high speed railway,

overcomes the poor geological conditions and reduces the blasting damage of houses above the tunnel, which puts forward higher requirements for construction technology and safety control. Therefore, before the commencement of the tunnel, the work area actively organizes an expert review meeting to carefully review the construction scheme and special safety scheme for the entrance and exit of the tunnel, which provides a reliable technical guarantee for the construction, and constantly optimizes the construction scheme according to the advanced geological prediction and monitoring measurement data in the later construction. In the construction of

, the bench excavation method is the main method, and the weak blasting excavation method of advance support is used for the construction of the access tunnel, which further reduces the blasting damage of the nearby residential buildings and creates good external conditions for the construction. In view of the great construction risk, the work area also implements the leadership guarantee system and night inspection system. Through the management and control of key processes such as arch installation, initial support and shotcreting, excavation size and concrete pouring, the safety quality and schedule of tunnel construction are guaranteed. With the successful completion of baotawan tunnel,

marks a critical step forward in the construction of the tunnel project in the third work area of section 4 of Chongqing section of Zhengzhou Wanzhou high speed railway, which lays a solid foundation for the follow-up project. It is understood that up to now, the total investment of Yunyang section of Zhengzhou Wanzhou high speed railway has been 58%. Jianglong's high-speed development went smoothly. The preliminary work project of Huangshi high speed railway new town was promoted rapidly, and the infrastructure project was started in an all-round way.