At 9:30 a.m. on October 22, the exit end of the Jifeng Tunnel, which was constructed by the TJ-5 Bid Project Department of the Jilin Section of the Shenbai High-speed Railway of China Railway Shanghai Engineering Bureau, successfully entered the tunnel, marking the official start of the double-port boring of the Jifeng Tunnel.
Jifeng Tunnel is one of the key control projects of the TJ-5 standard of the Jilin section of the Shenbai high-speed railway, and the tunnel exit is located in Tuanjie Village, Qidaojiang Town, Hunjiang District, Baishan City, which is a double-track railway tunnel with a total length of 3201.5 meters and a maximum burial depth of 115 meters.
The geological conditions of the tunnel are complex, the construction is difficult and the safety risk is high. In order to ensure the quality of the project and the safety of construction, the Jifeng Tunnel adopts the drilling and blasting construction process for excavation and excavation, and the daily construction input is controlled at 0.6 meters.
The entrance door of Jifeng Tunnel adopts 15 meters inverted oblique cutting type and 8 meter bias pressure type hole, and the exit cave door design adopts hat eaves miter type hole door. Construction of the tunnel is expected to be completed in February 2024.
Jilin Daily All-Media Reporter: Qiu Guoqiang