Yunnan Netnews (reporter Hu Xiaorong) At 11:58 on November 20, as the cable crane steadily landed the steel box girder weighing 114 tons on the tray next to the tower, the first steel box girder of the Lujujiang Special Bridge of the Yuchu Expressway was successfully erected. The Lujujiangte Bridge is the first single-tower single-span steel box girder suspension bridge in the history of world highway construction, with a main span of 780 meters and a maximum inclination tunnel anchor of 54 degrees, which has refreshed two world records at the same time.
The first steel box girder of the Yuchu Expressway Lujujiang Special Bridge was successfully erected For the picture
Located at the junction of Yimen County and Shuangbai County, the Green Juice River Bridge crosses the Green Juice River and is a key control project of the Yuxi-Chuxiong Expressway. It was built by China Railway Development and Investment Group Co., Ltd. and China Railway Bridge Bureau. The total length of the bridge is 798 meters, the bridge deck is a two-way four-lane, the design speed is 100 km / h, and both sides of the river are directly connected to the tunnel. The main span of the bridge has a total of 61 sections of steel box girders, which are fully welded structures, factory manufacturing units, and the entire sections are assembled in the on-site steel girder pre-assembly field, and symmetrically erected from the span to both sides by a cable crane. The steel box girder hoisted this time is the Yuxi shore end beam, which is 6.34 meters long, 31.4 meters wide and 3 meters high.
"The height difference between the bridge deck and the girder yard is 320 meters, which is very rare in China." Duan Miaoqi, chief engineer of the Luju River Bridge Project of the China Railway Bridge Bureau, said that the bridge is located in a V-shaped canyon, which is affected by the narrow pipe effect, and the instantaneous wind in the canyon is large, which brings great challenges to the lifting work of the steel box girder. In order to ensure the smooth erection of the steel box girder, the construction unit formulated a special hoisting plan, repeatedly deduced the process, and checked and identified safety risks. At the same time, the use of modern scientific and technological means to form a cable crane intelligent monitoring system, effectively ensure the safety and efficiency of the lifting process.
Yuchu Expressway is a very important part of the Guangkun Expressway and an important part of the expressway network of our province, with a total length of 190.597 kilometers. After the completion of the project, it will end the history of Shuangbai County without highways and realize the interconnection of the surrounding areas. The traffic time on both sides of the Luju River Bridge will be shortened from the original 1.5 hours to 2 minutes, which will greatly improve the backward infrastructure situation on both sides of the bridge, open up a fast channel for the people along the route to increase their income and get rich, and play an important role in promoting the tourism development and economic construction in central Yunnan.