On August 2, the main body of the xixi river bridge was built by China railway construction group. The spanning more than 260 meters deep canyons, nearly 500 miles in length and weighing more than 2600 tons of "big MAC", is China's high-speed rail's first of concrete-filled steel tube arch bridge, the world-class technical difficulty and risk, high iron bridge in our country is unparalleled in history.
Its body is built and the largest of China's high-speed rail bridge span, swivel the weight of the heaviest, first use "drag type pusher method" three new records, to scientific research and construction of special structure bridge in our country has accumulated successful experience.
The largest span
Into your railway xixi river bridge in guizhou province bijie city dafang and qianxi junction, is China's high-speed rail of the first concrete filled steel tubular arch bridge, bridge 493.6 meters, the highest pier 60 meters, a cross over about 260 meters deep in the "U" shape of xixi river valley, the span of 240 meters of new concrete filled steel tubular arch bridge deck structure, is the biggest span bridge of high-speed railway in our country.
Maximum swivel weight
The main arch ring of the xixi river bridge is a new technology of "extremely asymmetric two-way horizontal transformation". It is the first time that the high-speed railway double line in China has been adopted to achieve the advanced international and domestic leading level. The main arch of the bridge has a single rotation weight of 14,000 tons, which is connected by the relative rotation of the two sides of the canyon to the two sides of the same type of bridge.
The 14,000 ton weight is equivalent to the 230 knots of a fully loaded flame. The structure of the main arch is asymmetrical, like a crane boom, the front arch is 120 meters long, and the rear length is less than 6 meters. If the rotation center is 1 millimetre away, the hole error will reach 60 mm, which is so precise that it represents the latest level of similar bridge construction in China.
"Push-pull push" method for the first time
It is the first time for the construction of the steel composite beam of xixi river bridge to be used in the construction of "drag and drop" method.
With a total length of 482.7 meters and a weight of about 2,600 tons, the "big MAC" would have to be pushed and buttreled accurately at the canyon of more than 260 meters, and the technical difficulties and risks are extremely high. The group and the construction, design and scientific research and supervision departments of China iron and 18 bureau have joined forces to launch scientific research, break the limitation of the terrain and environment space, and solve many problems of worldwide engineering technology. Through arch bridge pier on the preset reverse tension, GPS satellite positioning monitoring technology, successfully avoids the pusher slip may be produced in the process of deformation of the main arch and arch bridge pier on cracking, achieve precise pusher in place.
As the main body of the xixi river bridge in your railway, it has accumulated successful experience for the research and construction of special structural Bridges in our country, and has also created favorable conditions for the completion of the railway.
Connection of yunnan, guizhou and sichuan into expensive high-speed rail length 632.6 km, the design speed of 250 km, into expensive high-speed rail traffic, from chengdu to guiyang travel time, shorten from the current 14 hours to 2 hours. Into your Gao Tiebei even the west into the guest and ChengLan railway, south to your jingguang railway, the east shanghai-kunming guest specially, for the construction of the fast passenger backbone of western region, to build the southwest to the coast of south China fast passenger channel is of great significance.