China News Service, Beijing, September 18 (Reporter Zhang Xu) According to the Ministry of Transport, at 22:00 on September 17, the corrugated steel web cantilever beams of the Nanyang Xiangjiang River Bridge on Pingyi Expressway in Hunan Province closed smoothly and became the Pingyi Expressway. Open to traffic on schedule lays a solid foundation.
Nanyang Xiangjiang River Bridge is a key control project of Pingyi Expressway, located in Helonghu Town, Xiangyin County, Yueyang City, with a total length of 7120.6 meters.
Among them, the main bridge is 511.88 meters long and the main span is 120 meters. It is currently the largest span of the corrugated steel web suspended beam bridge in China.
The corrugated steel web cantilever beams of Nanyang Xiangjiang River Bridge on Pingyi Expressway closed smoothly.
Photo courtesy of Pingyi Expressway
The upper structure of the main bridge is a prefabricated corrugated steel web variable cross-section PC composite beam. Compared with the conventional box girder structure, the corrugated steel web is used instead of the concrete web, which reduces its own weight by 25% to 30% and can completely avoid the concrete web from cracking. Phenomenon.
In addition, the prefabricated cantilever assembly has high precision and high speed, the construction quality is more controllable, and the efficiency is significantly improved.
Through the use of this technology, Nanyang Xiangjiang River Bridge has created a new record for the fastest cantilever construction of 2.5 days/piece.
The smooth closure of the bridge laid the technical foundation for the application of the new wave steel web composite box girder in continuous system bridges, and also expanded the application of wave steel webs in long-span bridges.
According to reports, the Nanyang Xiangjiang River Bridge was designed by Hunan Transportation Planning, Survey and Design Institute Co., Ltd., a subsidiary of Hunan Jiaotong Construction Group, and constructed by Hunan Road and Bridge Construction Group Co., Ltd., a subsidiary of Hunan Road and Bridge Construction Group Co., Ltd., applying 8 of the 10 new technologies in the construction industry17 Small items, 4 innovative technologies.
The corrugated steel web cantilever beams of Nanyang Xiangjiang River Bridge on Pingyi Expressway closed smoothly.
Photo courtesy of Pingyi Expressway
As a demonstration project of smart highway construction in Hunan Province, Pingyi Expressway fully implements the concept of building a strong transportation country, implements “standardized, automated, and intelligent” construction management across the entire line, vigorously promotes the application of “four new technologies” and launches “micro-innovation”.
The application of submersible drill dust collectors in expressways, and the country's first integrated mobile hydraulic formwork auxiliary project bridge anti-collision guardrail construction and other micro-innovative achievements won the gold and silver awards of the micro-innovation competition of the China Highway Society.
As of the end of August, the project had completed a total investment of 17.347 billion yuan, of which 3.684 billion yuan was invested during the year, accounting for 74% of the annual plan.
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