【Bridge Tunnel Innovation Week Exploration】 Wu Mengshan Special Bridge

▲ Wulian Special Bridge Effect Map

my card

Name: Wumengshan Special Bridge (the T12 contract section of the Nayong -Qinglong Expressway)

Birthday: under construction

Native: Guizhou

Level: 270m, the full length of the left bridge is 491.5m, and the full length of the right bridge is 511.5m

Type: Steel Toron-concrete combination arch bridge

Features: The main bridge adopts the upper-end steel truffle-concrete combination arch bridge plan, which is the world's first large-span steel truffle-concrete combination arch bridge

Construction unit: Naqing Expressway Construction Co., Ltd.

Design unit: CCCC Second Highway Survey and Design Research Institute Co., Ltd.

Construction unit: Guizhou Province Highway Engineering Group Co., Ltd.

As one of the project control projects, the Wumengshan Special Bridge is built across the Azhi River Valley and the slope on both sides. Upper-ended steel truffle-concrete combination arch bridge.

My unique place

1. Use steel abdominal rod instead of concrete abdomen

Steel truster-concrete combination arch bridge is based on the concrete box arch bridge, using steel abdominal rods to replace the concrete abdomen. This change may bring changes to the structural system's force characteristics. The arch is mainly compressed, but in fact, under factors such as living load, temperature, and shrinkage, bending moment or eccentricity often become the control factor of the internal force of the arch bridge. Therefore The bending ability and bending stiffness of its section, so the steel truffle-concrete combination structure has the possibility of applying to the arch bridge. In the cross section of large span concrete box, the bending effect of the abdomen is far less than the top plate of the section, but its weight accounts for 30 % to 40 % of the total weight of the arch ring. The concrete abdomen will greatly reduce the main arch of the main arch.

2. The main arch ring adopts the construction method of prefabrication of large -scale cable segments

Large -span concrete arch bridges have been built in my country. When the span is large, the steel pipe concrete skeleton method is usually used for construction. However, this method is difficult to pour the concrete abdomen and the cycle is longer. In order to accelerate the progress of construction, the main arch ring of the Wumengshan Special Bridge innovatively uses the construction method of prefabrication of a large -scale cable section, that is, the prefabricated large section arch ribs are first made, and the method of holding the cable cantilever buckle is combined with the dragon arch ribs.

The large -segment arch rib pre -production pre -production rack construction technology, construction site lifting and pre -assembly technology, construction technology, BIM technology, construction control technology, and large -segment prefabricated arched ribs of the construction site of the construction technology, construction control technology Technology has a positive effect on the innovation of construction technology.

3. Adhere to the concept of green construction concepts and environmental protection construction

In terms of green construction technology, mountain arch bridges are generally built in the steep canyon areas on both sides of the strait. The construction conditions are generally poor, and its excavations are usually large and have a large impact on the environment. The construction of construction, the excavation of the arch, and the comprehensive layout of the pre -fighting field combine the advanced concept of green construction.

▲ The slope anchor cable is forever

▲ Arched excavation rope saw method construction

▲ Arched excavation tower crane increases slag

▲ Double -level pre -fighting field layout

Improve the structure of Guizhou Road network structure to improve transportation pattern

The successful completion of the Wumeng Mountain Special Bridge will form a complete set of technologies suitable for large-span steel truffles-concrete combination bridges suitable for mountainous areas to promote the application of steel truffle-concrete combination arch bridges in mountainous areas, and promote the development of mountain bridges and transportation. As the key project of the Naqing Expressway, the Wumengshan Special Bridge will become the world's first steel truffle-concrete combination arch bridge. The construction of the bridge is of great significance to improving the structure of the Guizhou Provincial Highway Skeleton Something, improving the transportation pattern of Guizhou Province, and promoting the development of tourism and society and economy in the Southwest region.

Manuscript support

Guizhou Provincial Highway Engineering Group Co., Ltd.

- END -