Smooth closure of Bayu Bridge on Lalin Railway
Xinhua News Agency, Lhasa, November 9 (Reporter Liu Hongming) at 17:20 on the 9th, with the completion of the concrete pouring in the last section, the Bayu Bridge, the third continuous steel structure bridge with the largest span from Lhasa to Linzhi, was successfully closed. It indicates that the whole line of heavy and difficult projects have made a phased breakthrough again.
The Bayu Bridge, built by the 12th Bureau of the China Railway, is located in Shannan City, in the Grand Canyon area of the Yarlung Zangbo River, with a total length of 283.3 meters, a deck width of 19.1 meters, and a maximum pier of 61.5 meters across the Yarlung Zangbo River. It is an important link between Sangzhuling Tunnel and Bayu Tunnel.
Qiao Zhibin, director of the Lhasa Railway Project Department of China Railway Twelfth Bureau, said that builders use high durability concrete construction technology to overcome problems such as large temperature differences and easy cracking of concrete. At the same time, steam generator is equipped to spray curing the beam to ensure that the concrete yin and yang surface is maintained evenly and the strength of the beam is controlled.
The builders also adopt the energy dissipation technology to install six dampers at the connection between the top cap of the abutment and the bottom of the beam to protect the main structure and components from destruction in strong earthquake or strong wind, which has higher safety, economy and technical rationality. 400MPa grade high strength steel bar is selected in the construction of the bridge, which improves the reinforcement efficiency of structural members.
According to Tibet Railway Construction Co., Ltd., by the end of October, 115 bridges had been completed and 41 tunnels had been completed. Since the start of construction in 2015, 76 per cent of the total investment has been completed. Since October 2018, the Lalin Railway has laid 106 kilometers of tracks.
The Lhasa-Linzhi Railway is a key project of the National 13th five-year Plan, with a total length of 435.48 km and a design speed of 160km / h. It is the first electrified railway in Tibet. The geological conditions of the project are complex, with a bridge-tunnel ratio of more than 75%. At present, it has entered a critical period of construction. It is expected to be completed and opened to traffic in 2021, when it will effectively improve the layout of China's regional railway network. It is of great significance to promote economic development along the route, improve people's livelihood, and promote connectivity inside and outside the region.