China News Service, Chengdu, September 29 (Reporter Liu Zhongjun) On the 29th, the longest tunnel of the Yibin-Yunnan Weixin Expressway (hereinafter referred to as: Yiwei Expressway), the left line of the Shangluo Tunnel, was completed in advance, which marked Yiwei Significant progress has been made in expressway construction, laying a solid foundation for the entire line to open to traffic.

  It is understood that the Shangluo Tunnel of Yiwei Expressway is located in Gongxian County, Yibin City. It is a two-way four-lane road tunnel. The left line of the Shangluo Tunnel is 7066 meters long and the right line is 7032 meters long. It is a high-risk tunnel and is also the entire line of the expressway. The longest tunnel and key control works.

The tunnel passes through the complex geological conditions, covering karst, rock burst, water inrush, large deformation of surrounding rock and other unfavorable geology, and the daily water inflow of a single port is up to more than 20,000 cubic meters, and the construction conditions are difficult and difficult.

Exit end of Shangluo Tunnel on Yiwei Expressway.

Photo courtesy of China Railway Fifth Bureau

  Since the construction of the tunnel, in the face of complex geological conditions, the builders of China Railway No. 5 Bureau have adopted the method of "long tunnel and short hit", opened inclined shafts and transverse tunnels, increased the working surface, and carried out scientific construction to overcome unfavorable geology, new crown pneumonia epidemic, high temperature To avoid adverse effects such as frequent earthquakes, speed up the construction progress, ensure safety and quality, and ensure that the left line of the Shangluo Tunnel is connected ahead of schedule.

  It is reported that Yiwei Expressway is one of the 7 new passages out of Sichuan planned by Sichuan Province. The project starts at the Shuanghe hub of Sichuan-Yibin Ring Expressway, passes through Changning County and Gong County, and ends at Banzhu Bay (the border between Sichuan and Yunnan). ), connecting the Weixin-Zhenxiong section of the Yibin-Bijie Expressway under construction in Yunnan, with a total length of about 105 kilometers and a construction mileage of about 86 kilometers.

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