China News Service, Meizhou, October 26 (Guo Jun, Deng Lianxu, Tang Wenjian) On October 26, at the construction site of the inclined shaft of the Xiahuangtian tunnel on the Meilong Railway, the equipment roared and people were full of voices.

The reporter learned from the China Railway Twenty-Fifth Bureau that the Xiahuangtian Tunnel, a key control project of the Meilong Railway and the longest tunnel on the whole line, has been officially entered into the tunnel, marking a new breakthrough in project construction.

  The Meilong Railway is located in the two cities of Meizhou and Heyuan. It is the first 350 kilometers per hour high-speed railway project in Guangdong Province that is self-invested and constructed. It is also a major project closely linked to Meizhou, Heyuan and the Guangdong-Hong Kong-Macao Greater Bay Area.

The Meilong Railway has a total length of 95.6 kilometers and a construction period of 4 years. The line leads from the Meizhou West Station of the Meishan High-speed Railway and passes through Meixian District, Xingning City, Wuhua County and Longchuan County of Heyuan City along the way. Longchuanxi Station of Shenzhen High Speed ​​Rail.

There are 4 stations in Meizhou West, Xingning South, Wuhua, and Longchuan West, among which Xingning South Station and Wuhua Station are newly built stations.

  The Xiahuangtian tunnel under construction this time is located in Longchuan County of Heyuan City and Wuhua County of Meizhou City. It has a total length of 7377 meters and a maximum buried depth of 290 meters, making it the longest tunnel on the entire line.

The tunnel traverses fault fracture zone and strongly developed karst zone, rich in groundwater, complex geological conditions, difficult construction, and high safety risk. It is a key control project across the line.

  It is understood that the tunnel construction is generally excavated from two ends, digging from the two working faces of the inlet and the outlet, and the tunnel is opened in the middle to achieve penetration.

In the construction of long and large tunnels over 3000 meters, in order to shorten the construction period, it is usually chosen to add inclined shafts at appropriate locations in the tunnel to increase the driving surface.

  "During the construction of the Xiahuangtian tunnel, we added an inclined shaft and added two working faces from the middle of the tunnel, and excavated in the direction of the entrance and exit respectively to speed up the construction progress. According to the construction plan, the tunnel will be launched in September 2022. Realize the connection." Project leader Guo Xiaojun said.

  The 4 section of Meilong Railway contracted by China Railway 25th Bureau has a total length of 29 kilometers, including 25 bridges and 19 tunnels.

Since entering the site, the construction party has not waited and taken the initiative, organized several professional and technical personnel on-site surveys, and held multiple special meetings for tunnel construction, and continuously optimized the on-site construction organization and construction plan to ensure the smooth entry of the tunnel. Hole construction.

At present, construction sites such as the Xiahuangtian Tunnel, Wuhua Bridge, and Youlingba Bridge within the 4 bids have started successively, and the project construction is progressing steadily.

  The Meilong Railway is a section of the "Longyan-Meizhou-Longchuan" railway in the eastern part of the "High-speed Railway Regional Connection Line" planned in the "Medium and Long-term Railway Network Planning". The railway network key projects in the Planning. After the completion of the project, the travel time from Meizhou to Guangzhou, Shenzhen and other cities in the Guangdong-Hong Kong-Macao Greater Bay Area will be shortened to within 1.5 hours. This will speed up the construction of the Pearl River Delta, eastern Guangdong area and Meizhou and Heyuan high-speed railway channels and improve the layout of the Guangdong high-speed railway network It is of great significance to promote regional economic development. (Finish)