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Panjing Expressway, 4 hours drive from Chengdu to Xichang. ...
The main bridge of Labajin Bridge, one of the control projects of Yaxi Expressway, was successfully closed. Yaxi Expressway is expected to be completed and opened to traffic this year. By then, citizens can drive from Chengdu to Xichang on the expressway, which takes only 4 hours.
The seismic performance of pier technology has been greatly improved.
Labajin Bridge is located in Yingjing County, with a length of1140m and a single pier span of over 200m. In which 10 pier height182.5m. Together with the connection between the bridge and the deck, it is more than 220 meters high and has the reputation of "the tallest pier in Asia". "Asia's tallest pier" adopts "concrete filled steel tubular composite column" structure, which is the first time in bridge construction in China. The high pier is installed in sections. Firstly, four steel pipe columns with a diameter of 1m and a height of 12m are installed at the four corners of the pier. Concrete is poured into the steel tube columns, and then four steel tube columns are wrapped with reinforced concrete and connected with reinforced concrete slabs to form a hollow box structure. After the first floor is completed, go to the second floor. C80 concrete, which is the highest grade at present, is used for steel tubular columns, and its strength is 4 to 6 times that of ordinary strength concrete, which can not only save cement, steel bars and other raw materials 15%-20%, but also greatly improve the seismic performance of the structure.
Chengdu to Xichang will be opened to traffic for 4 hours during the year.
According to the data of the Provincial Communications Department, as of August, Yaxi Expressway has completed 44.9 million cubic meters of subgrade earthwork, accounting for 99.8% of the total; The superstructure of extra-large bridges and bridges 1 133000 m3, accounting for 94% of the total, and the substructure 1.44 m3, accounting for1.000% of the total; Tunnel excavation is 81668m, accounting for 98% of the total; There are 429 culverts and passages, accounting for 96% of the total.
One of the most difficult and difficult projects, Nishan Tunnel, has completed 90.5%. The tunnel crosses the geological fault 15, with the left line of 9972m and the right line of10007m. This is the first long tunnel under construction in southwest China. The maximum buried depth of the tunnel is1.648m, which is one of the largest tunnels under construction in China. It takes about 65,438+00 minutes for the car to pass through the tunnel.
The total length of Yaxi Expressway is 239.84 kilometers. Previously, the Mianning section and Yingjing section of Yaxi Expressway have been completed and opened to traffic, and it is expected that the whole line will be completed and opened to traffic this year. By then, the Beijing-Kunming Expressway, the national trunk highway, will realize the whole high-speed in Sichuan, and it will only take Chengdu citizens four hours to drive to Xichang.
The "Best" of Yaxi Expressway
The construction of Yaxi Expressway is famous for its four characteristics: high, large, difficult and new. Many technologies in design and construction have reached the international and domestic leading level, and many data innovations are the highest in the history of China's traffic construction.
The above is the introduction of Zhong Da Consulting to Sichuan Yaxi Expressway. If you want to know more about highways, please pay attention to the architectural knowledge column of Zhong Da Consulting.
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