Introduction to the Labakin Bridge on the Yaxi Expressway?

If someone asks you which road to heaven is China, many people may say it is the Tibet Railway, but you may not know that there is also a real "road to heaven" in China, which is called the China Expressway. The "unparalleled project" in the history of highway construction is the Yaxi Expressway from Ya'an, Sichuan to Xichang, the capital of Liangshan Yi Autonomous Prefecture. As a member of the majority of road and bridge builders, my wish is to drive on the Yaxi Expressway!

This 240-kilometer highway climbs from the edge of the Sichuan Basin to the Hengduan Mountains, crossing the Qingyi River, Dadu River, Anning River and other water systems and 12 earthquake fault zones, spreading among the high mountains. There are overlapping mountains and dangerous terrain. Therefore, the Yaxi Expressway is also known as the "Tianti Expressway".

C80 concrete pouring "Asia's tallest pier"

The Labakin Bridge is a huge bridge across the Labakin ditch on the Yaxi Expressway. It is located in Yingjing County, with the main The bridge span combination is: 105+2×20105m, the bridge length is more than 1140 meters, and the maximum span of a single pier is 200 meters. Its main span is a continuous rigid frame with variable cross-section and is set in sections. The box girder of block 0 is 20 meters high and 200 meters in span. The maximum height difference from the highest point of the bridge deck to the ground is 250 meters, and its No. 10 pier has the title of "the tallest pier in Asia".

The Labakin Bridge adopts a "steel-tube concrete composite column" structure, which is the first time in my country's bridge construction. The high pier adopts the segmental installation method. First, four steel pipe columns with a diameter of more than 1 meter and a height of 12 meters are installed at the four corners of the pier. Concrete is poured into the steel pipe columns, and then the four steel pipe columns are surrounded by reinforced concrete and covered with reinforced concrete slabs. connected to form a hollow box structure. After one layer is completed, proceed upwards to the second layer. The highest grade C80 concrete currently used is used in the steel pipe columns, and its strength is 4 to 6 times that of ordinary strength concrete. The purpose of this is also to strengthen the bridge.

The local area is located in the shadow of the Daxiangling Mountains. During rainy and foggy weather, the bridge flies past like a "giant dragon" and is looming in the mountains. A gentle breeze in the valley blew by, and the bridge once again showed its beautiful appearance. Looking up from under the bridge, you can see the majesty and majesty of Labaqin Bridge. People can't help but marvel at the magic of heaven and the ingenuity of man-made work. .

Labakin Valley is located in a high-intensity earthquake zone, and the geological conditions are extremely complex. How can safety be ensured while driving on a bridge of more than 200 meters? Due to the unique structure of the bridge, its earthquake resistance reaches 9 degrees. In order to ensure the safety of passing vehicles, a large amount of reinforced concrete is used for the guardrails on both sides of the bridge. Even if the impact force reaches hundreds of kilograms, the guardrails will remain intact.

The unique scenery of Yaxi Expressway

Driving on this road, looking around, it feels like you are flying in the air. The immersive shock makes you sigh: Which company has the best road construction technology? I guess no one can build this road except China!

This road is basically a combination of a super viaduct and a super long tunnel. There is no flat ground. There are 25 tunnels with a length of about 41 kilometers, including 2 extra-long tunnels and 16 long tunnels. Do you have the fantasy of touching the sky while driving on the road?

The above is Zhongda Consulting’s introduction to the Labakin Bridge on the Yaxi Expressway. If you want to know more about highways, please pay attention to the construction knowledge column of Zhongda Consulting.

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