On June 22, 2020, the first 1,000-ton box girder of the Fuzhou-Xiamen High-speed Railway Meizhou Bay Cross-Strait Bridge, constructed by China Railway 11th Bureau, was successfully erected. The use signifies that China's high-speed railway construction has achieved a major improvement in technology and equipment, adding another major national weapon to the construction of high-speed rail.

On June 22, the world's first 1,000-ton bridge-building machine independently developed, designed and manufactured by China, "Kunlun", was put into use in the newly built Fuzhou-Xiamen High-speed Rail Meizhou Bay Cross-sea Bridge, which was surveyed by China Railway Fifth Survey Compared with the traditional 900-ton bridge crane, the Design Institute (referred to as the Fifth Institute of Iron) and Hanjiang Heavy Industry of China Railway 11th Bureau Group not only extended the maximum length of the carrying box beam from 32 meters to 40 meters, but also increased the tonnage from 900 tons to 1000 tons, at the same time, the system solves the problems of bridge erection and power supply coordination in special working conditions. It has the characteristics of higher intelligence and wider application scenarios. It has epoch-making significance for the future construction of China's high-speed rail.

"The "Kunlun" 1000-ton bridge-building machine is an "all-round player", which can be compatible with the construction of high-speed rail box beams with a span of 24 meters, 32 meters and 40 meters, which is equivalent to a (1000-ton bridge-building machine) Three (traditional bridge machines) can simultaneously reduce the cost of erecting beams by 20% and increase the speed of erecting beams by 25%," said Wan Peng, technical leader of the R&D team of the No.5 Iron Institute.

When encountering a tunnel, the traditional bridging machine must be disassembled before it can pass, and it generally takes 3-5 days. "Kunlun" can realize automatic tunnel crossing, saving time to build a 400-meter high-speed railway bridge. At the same time, it has also achieved the first construction under various special conditions such as beams in tunnels, 0 meter beams in tunnel entrances and exits, which has obvious advantages for the construction of high-speed railways in western regions with high mountains and deep valleys and frequent bridge and tunnel conversions. It will effectively help the implementation of the strategy for the development of the western region in the new era.

"This model uses high-strength steel plate with a tensile strength of 785 MPa as the main beam structure of the integrated transport frame. This material standard has reached the material level of aviation and submarine equipment, with higher strength and lighter weight." China Railway Guo Jixiang, head of the 11th Bureau of Hanjiang Heavy Industry Equipment Manufacturing, said that the bridge all-in-one machine is also equipped with a laser matrix sensor system, which can realize automatic driving in the tunnel by scanning the surrounding environment data, and can also automatically correct deviation when walking, which guarantees The equipment runs safely and smoothly.

"The Fuxia High Speed Rail is China's first high-speed railway across the sea. As a railway connecting mountains and seas, the bridge uses a 40-meter box girder and 1,000 tons design. Compared with the traditional 32-meter box girder design, it covers less area and has lower investment costs. When crossing rivers and roads, it not only provides a more economical and reasonable design plan, but also effectively saves construction land, increases navigability, reduces the impact of tide on the pier, and improves the safety of the cross-sea bridge." Southeast Coast Railway Fujian The relevant person in charge of the company said. At the same time, the Fuzhou-Xiamen High-speed Railway is an important channel for Fujian’s integration into the country’s “Belt and Road” construction. Upon completion, it will realize the “High-speed Railway into Beijing” in 6 cities including Fuzhou, Xiamen, Putian, and Quanzhou. The development of deep cooperation with mountain industry is of great significance.

The successful installation of the 40-meter prefabricated box girder of the Meizhou Bay Cross-sea Bridge, the world’s first thousand-ton bridge-integrating machine "Kunlun", marks the addition of China’s high-speed rail construction to the country’s high-speed railway construction. Epoch-making significance. Editor/Peng Xue