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on october 4, good news came from chengda-wan high-speed railway co., ltd. after 1,384 days and nights of construction, the exit end of the huayingshan tunnel of the chengdu-dazhou-wanzhou high-speed railway (hereinafter referred to as the "chengda-wan high-speed railway") was completed. . at the same time, the xi-chongqing high-speed railway also seized the "golden" period of construction and advanced construction at full speed during the national day holiday.

the exit end of huayingshan tunnel of chengdu-wanzhou high-speed railway is connected

the huayingshan tunnel of the chengda-wanzhou high-speed railway is 8,735 meters long. it is a full-line control project. the tunnel passes through gas strata, coal seam goafs, karst, bedding and other unfavorable geology. it is a first-class high-risk railway tunnel. due to the difficulty of construction, the tunnel was used as a pre-bid section to start construction ahead of schedule.

liu jun, the person in charge of the first tender project of the chengdawan high-speed railway station of the china railway second bureau, introduced that the construction team innovatively used "40-meter ultra-long distance large pipe shed to pre-reinforce the surrounding rock", "secondary lining concrete vault to prevent voiding" and "secondary concrete lining" new construction methods such as "vault plug-in vibration" and the introduction of equipment such as wet spray manipulators, waterproof panel automatic paving trolleys, and intelligent spray maintenance trolleys are used to replace manual operations, achieving both construction safety and construction efficiency improvements.

in order to speed up the construction progress, the construction team divided the tunnel into the entrance direction, the exit direction and the horizontal tunnel and the main tunnel, and constructed them at the same time. after unremitting efforts, all 2,866 meters in the exit direction have been penetrated, and only 380.6 meters remain between the entrance direction and the main horizontal tunnel of the tunnel. "the opening of the exit end as scheduled gives everyone great confidence. all construction workers will work hard to achieve the completion of the entire tunnel by early 2025," liu jun said.

the chengdu-wanzhou high-speed railway is located in sichuan province and chongqing city, with a design speed of 350 kilometers per hour. it is a component of the riverside channel in the national "eight vertical and eight horizontal" high-speed railway network. after completion, it will form a direct line from the chengdu plain area to the central plains and the beijing-tianjin-hebei region. the convenient passenger transportation channel has positive significance for promoting the construction of the chengdu-chongqing twin-city economic circle. during this year’s national day holiday, construction across the board will not “close”.