Newshot Building "giant building blocks" at a height of 100 meters: China's railway engineering completes pier construction using a lattice pier structure for the first time
IT之家 News, November 13: According to China Railway Kunming Group Co., Ltd., on the morning of November 12, as the final batch of concrete-filled steel tube was successfully lifted into place, the No. 9 lattice pier of the Nanxi River Grand Bridge on the Wenmeng Railway was successfully completed. This is the first time a lattice pier structure has been used in domestic railway engineering, marking an important technical breakthrough in China's construction of high-pier bridges in mountainous areas.
The Nanxi River Grand Bridge is located in 云南省蒙自市芷村镇, with a total length of 789.71 meters. The maximum height difference between the bridge deck and the ground reaches 118 meters, making it the highest bridge on the entire Wenmeng Railway. The terrain in the bridge site area is highly undulating, crossing deep-cut valleys, with unfavorable geological conditions such as unstable rock and rockfalls, and karst development, making construction extremely difficult.
The entire bridge is designed with 3 lattice piers, among which Pier No. 9 is 105 meters high, the tallest pier on the entire line. Its lattice section is divided into 7 segments and assembled from 176 individual components, with the largest single component weighing up to 24 tons. Construction is like "building giant building blocks" at a height of 100 meters.
According to reports, the concrete-filled steel tube lattice pier used this time is assembled from steel tubes and I-beams into a trapezoidal pier body that is "wider at the bottom and narrower at the top", with high-strength concrete poured inside, which can save 30% to 50% of concrete and steel. At the same time, the prefabricated assembly process greatly reduces on-site pollution and construction risks, improves seismic resistance and geological adaptability, and plays multiple roles in cost reduction, efficiency improvement, low carbon, and safety.
IT之家 note: The Wenmeng Railway has a total length of about 116 kilometers and a design speed of 160 kilometers per hour. It is a national Class Ⅰ double-track electrified railway for both passenger and freight traffic, and an important project of the southwest border railway in China's medium- and long-term railway network plan.
The line starts from Wenshan Station, passes through Mengzi City, and connects to the Yuhe Railway to Honghe Station, with a total of 7 stations (5 newly built). As of now, the pre-station works are about 63% complete overall, and key projects such as bridges, tunnels, and station buildings are being comprehensively advanced.
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