of September 23, with the precise hoisting of the last steel girder in place, the Tianmen Bridge of Anpan Expressway in Guizhou, which was constructed by Guangzhou Bureau of China Railway, was successfully closed. The bridge spans the Beipan River, with a deck height of 560 meters from the river surface, a total length of 1553 meters and a main span of 820 meters . After completion, it will become the third highest bridge in the world in the canyon area and the highest two-way six-lane steel truss suspension bridge in the world, marking a new breakthrough in bridge construction technology in China. The steep terrain and complex climate
of Beipanjiang Gorge bring severe challenges to the construction: the steep cliff and limited working space; the temperature difference between day and night is more than 15 ℃, which affects the performance of steel and concrete; the frequent gusts in the gorge increase the risk of high-altitude operation. The project team carried out special technical research to solve the construction problems one by one.
Aiming at the difficulty of steel truss girder hoisting, the project has developed an intelligent hoisting control system for cable crane, which integrates Beidou positioning, Internet of Things and automatic control technology, controls the walking accuracy of sports car and the elevation error of hoisting point within 10 cm, and monitors the three cable forces of cable crane, the deviation of main tower, the operation status of winch and steel truss girder in real time. Fully guarantee the safety of hoisting. During the
closure process, the J27 section weighing 260 tons on Panzhou Bank needs to complete a 90-degree rotation in a confined space. Through many simulations, the technical team adopted the four-point lifting and rotating sling system, and the operators accurately controlled the steel truss girder to rotate at a uniform speed of 18 degrees per minute, relying on the intelligent monitoring system to dynamically rectify the deviation, and achieved high-precision closure in only 5 minutes.
In order to protect the ecology of Beipanjiang Nature Reserve, the project abandons the traditional landing support method, innovatively adopts the non-support lifting platform combined with permanent cable clamp and sling, avoids building large supports at the bottom of the valley, minimizes the interference to the original ecology, and provides a green construction model for bridge construction in mountainous areas and ecologically sensitive areas. The construction
of Tianmen Bridge runs through the concept of "intelligent construction", and the efficiency and quality of the project are significantly improved through the systematic application of a number of advanced technologies: the project adopts T-beam intelligent production line, relying on intelligent temperature and humidity control to shorten the concrete curing cycle from 7 days to 1 day, the efficiency is increased by 6 times, and the key indicators are better than national standard; The millimeter-level construction control is realized by using GPS static measurement and robot automatic positioning technology to ensure the smoothness of the bridge deck. In view of the high temperature and humidity environment in the canyon, the whole process of concrete quality control is implemented from raw material optimization, mix proportion optimization to mixing and adding ice, and real-time temperature control to ensure the quality of structural molding. Up to now, related innovations have won nine national patents and many provincial and ministerial QC achievements, which fully reflects the hard core support of technological innovation for engineering quality.
Tianmen Bridge connects Wuwang Village, Huaga Township, Shuicheng District and Launch Village, Yezhong Township. After opening to traffic, the journey between the two places will be reduced from 3 hours to 15 minutes, greatly facilitating people's travel, schooling and medical treatment. As the key control project of Anpan Expressway, the completion of the bridge will effectively divert the traffic pressure of Shanghai-Kunming Expressway, optimize the regional road network structure and improve the logistics efficiency; at the same time, it will effectively promote the development of tourism resources of Beipan River Grand Canyon and the inheritance of non-heritage culture along the line, and promote the development of farmhouse entertainment, residential and other industries; it will also reduce the transportation cost of local coal and mineral resources, and inject new impetus into rural revitalization.
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