24-hour full cycle construction, the thickest rock wall of the longest tunnel of Ziyi high-speed railway is "reduced" by 8m every day

On the afternoon of February 7, from the No. 4 inclined shaft of Baiyunshan tunnel of ChengZiyi high speed railway to the construction site of the main tunnel, the roar of transport vehicles and the sound of electric welding were intertwined and resounded through the tunnel. This is the first day of work after the Spring Festival, but the construction "Symphony" here has been playing continuously since its construction, and has not stopped during the new year holiday.
Baiyunshan tunnel, with a length of 13.3 kilometers, is the longest tunnel in the whole line of Chengdu Ziyi high-speed railway and the only super long tunnel with high gas in the whole line. There are two working faces in No. 4 inclined shaft work area. On that day, the construction personnel are mainly focusing on the working face connected with No. 3 inclined shaft work area and in the direction of Chengdu.

"Baiyunshan tunnel is divided into 6 working areas and 13 working faces. At present, only 1889 meters remain to be opened. The rock wall between the working areas of No. 3 and No. 4 inclined shaft is the thickest." Zhao Kai, the safety director of the headquarters of China Railway 12th Bureau, which undertook the construction of Baiyun Mountain tunnel, said that in order to ensure the realization of the goal of "connection by the end of June", nearly 200 people in the two work areas are working in full cycle for 24 hours, and the thickest rock wall is thinning at a rate of 8 meters per day.