Successful closure of the main arch of Daheba Bridge, the first steel tube arch bridge of the expressway along the Yangtze River

April 11，The Daheba Bridge, a high-speed control project along the Yangtze River designed by the Provincial Transportation Design Institute, was successfully closed.，The Daheba Bridge is 386 meters long.，Is a clear span of 360mHalf-through steel tube arch bridge，Design lifting weight of 140 tons，It is the largest span arch bridge that the company has participated in the design.，It is also a special bridge with the largest lifting weight along the Yangtze River Expressway.。In the whole process of design service，The company works with a philosophy of excellence.，Two technical breakthroughs have been achieved in the design and construction of Daheba Bridge.：

First, it is the first time to build a large-span arch bridge abutment foundation in the fracture zone.，Properly enlarge the size of the arch abutment to reduce the base stress，Reinforce the integrity of left and right side abutments，Eliminate differential settlement effect。

Secondly, it is the first time to adopt the method based on the arch abutment of long-span concrete-filled steel tubular arch bridge“Vertical brace+Diagonal brace”Combination scheme，The excavation of the foundation pit of the arch abutment is greatly reduced，But also ensure that safety of the structure.。

The smooth closure of the main arch of the Daheba Bridge，It laid a solid foundation for the planned opening of the expressway along the Yangtze River.。（Sichuan Traffic News）

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