Detailed introduction
The total length of Sanchaji Bridge is1577m, in which the main bridge is 732m long and the main span is 328m long. The self-anchored suspension bridge with a span of 328 meters ranks first in the world among similar bridges. The Second Ring Road is 46 meters wide, with six lanes, with a design speed of 60 km/h, and the roads surround the urban area of Changsha, connecting ten urban trunk roads, such as 107, 3 19, Chang-Chang Expressway, etc. Through interchanges in vertical and horizontal urban areas.
The main structure of the bridge is pulled by two huge main cables, and all the weight of the bridge is distributed on these two cables. There are also many hanging ropes on the bridge deck, and countless steel strands are distributed inside the hanging ropes. Their main function is to share the bearing capacity of the whole bridge, increase the service life of the bridge and reduce the burden of slings. The bridge is divided into motor vehicle lanes and non-motor vehicle lanes, with a central median in the middle and emergency parking lanes on both sides of the bridge deck to reserve emergency avoidance space for various accident vehicles.
Epoxy resin materials are widely used in bridge deck pavement. According to experts from China Epoxy Resin Industry Association, the deck pavement of the main span steel box girder of this bridge should be sandblasted and derusted on the steel plate first, and then sprayed with epoxy zinc-rich paint to prevent corrosion, so as to make the epoxy ring water layer impervious, and then make the buffer layer with rubber asphalt mortar. After the buffer layer is completely completed, asphalt concrete is poured, and finally, modified asphalt is paved and modified emulsified asphalt is sprinkled. Because the foundation of the main bridge and the east-west approach bridge outside the main span is reinforced concrete, asphalt can be paved as long as the waterproof and oxygen-proof layers are well prepared when paving the bridge deck.
work progress
On April 30, 2004, the foundation stone of the bridge was laid.
On September 14, 2004, the first steel cofferdam of the bridge floated in place.
On May 23rd, 2005, the main pier of the bridge surfaced.
On August 2, 2005, KLOC-0, the first steel box girder of the whole bridge was pushed and erected.
In 2005 165438+ 10, 65438+June 2005, the prestressed concrete box girder of the first section of the whole bridge was pushed and erected.
On April 18, 2006, the steel box girder of the main bridge of the bridge was pushed and erected.
On May 9, 2006, 19, the cable installation of the main bridge began.
On June 8, 2006, the main bridge was closed.
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