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On February 25, according to Shanghai Tunnel Engineering Municipal Group, the first 100-meter steel box girder of the Dongbatou Yellow River Bridge, part of the Henan Lanyuan Expressway Lankao to Fengqiu section project undertaken by the company, was successfully erected. This erection is the first in China to use a super-large bridge erection machine to erect a 100-meter span steel box girder in a single span, and to perform a 1470-ton reverse lifting operation. This technology is of great significance to bridge construction.
According to reports, the Dongbatou Yellow River Bridge is a key control project of the Lanyuan Expressway crossing the Yellow River, connecting Lankao to Fengqiu, with a total length of 9104 meters.
“The 100-meter span steel girder erected this time has the largest span among similar bridges in China, with a weight of 667 tons, making transportation and hoisting extremely difficult,” introduced Zhu Jinlong, project manager of the Lanyuan Expressway Lankao to Fengqiu section project of Shanghai Tunnel Engineering Municipal Group. “We adopted the domestically pioneered LG700 super-large bridge erection machine for full-span erection. Unlike the traditional incremental launching method, this hoisting mainly applies upward lifting force to the steel girder through the erection machine, optimizing the internal force distribution between the steel girder and concrete, improving the mechanical performance of the composite girder, and ultimately achieving successful erection.”
It is worth mentioning that the LG700 bridge erection machine is currently the largest highway bridge erection machine in China, specially developed for this project. It has a total length of 213 meters, a width of 39.61 meters, a height of 26.05 meters, and a total weight of 1850 tons. Its maximum erection capacity is 700 tons, and it is equipped with 7 sets of reverse lifting suspension devices with a maximum reverse lifting capacity of 1500 tons, equivalent to the weight of 25 CRH high-speed train cars.
In addition, Shanghai Tunnel Engineering Municipal Group independently developed an intelligent monitoring system for erection. By monitoring equipment status in real time, it records key data during girder manufacturing and erection, such as stress, strain, and displacement, and promptly identifies and addresses potential quality and safety hazards.
According to experts, the technology used in this erection has significant advantages: high degree of assembly and fast speed; compared with the traditional incremental launching method, it reduces steel usage by 15%; it increases the compressive stress reserve of the concrete bridge deck, reduces the risk of cracking, and improves the durability of the structure. This technology can be applied to various scenarios, such as bridge construction in plains, mountainous areas, and river-crossing and sea-crossing areas, and has broad application prospects.
It is reported that the Lanyuan Expressway Lankao to Fengqiu section project is a key construction project of the “13445 Project” of Henan Province Expressway. It starts from the north of Lankao, connecting to the Rizhao-Lankao Expressway, crosses the Yellow River to Fengqiu County, and ends at the Daqing-Guangzhou Expressway, connecting to the Fengqiu to Yuanyang Expressway. After completion, the project will form a major east-west corridor on the north bank of the Yellow River, which is of great significance for accelerating the development of the “Central Plains Urban Agglomeration”, building the Zhengzhou metropolitan area expressway ring line, and promoting the high-quality development of the Yellow River Basin.
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