source: reporter Jia Fangzheng
March 26, 2017, the the Yellow River River Basin single span bridge - the the Yellow River highway bridge of the Ji Qi, is expected to open in July this year. At that time, Ji'nan and Dezhou on both sides of the Yellow River will deepen the docking and deepen cooperation. It is of great significance to develop the western part of Shandong province.
the the Yellow River highway bridge in Ji Qi is 2287 meters in length and 35.5 meters in width, using a two-way six lane highway Technical standards, design speed of 80 km / h, the two sides are equipped with rail electric lanes. The main bridge type is the steel mixed composite beam cable-stayed bridge with double cable surface in Twin Towers. On the basis of the ordinary steel mixed composite beam cable-stayed bridge, the semi floating system is separated by the consolidation of the pier and the tower beam. The tower adopts a portal frame structure, 138 meters high, and 32 pairs of orange cables on both sides of the tower, which symbolizes riches, happiness and happiness. The structure of the bridge is new and the construction scale is huge. After completion, the bridge will become the largest single span cable stayed bridge in the Yellow River basin. The whole bridge is like a sun shining on the Yellow River, which adds a beautiful landscape to the mother river.
the pylon of the bridge is a portal frame structure with a full height of 138m, which is divided into upper, middle and lower columns and upper and lower beams. It has the characteristics of "middle length, two short". The upper and middle tower connections are provided with crossbeams, and the height difference between the bottom beam of the upper beam and the root of the tower is 120.5m, so that the traditional "floor type steel pipe support" can not be constructed. Based on the actual construction situation in the field, the composite bracket steel truss support system is developed on the basis of the bracket of the leg, the main beam of steel truss and the reinforcement of the prestressed anchorage, and the technical problem of the construction of the super high H type cable tower is solved by using the whole hoisting technique.
the bridge deck bridge design width is 35.5m, two-way 6 Lane layout, both sides reserved light rail lane. The steel - mixed beam of the bilateral box is formed by the splicing of steel main beam, cross beam and small longitudinal beam. The precast bridge deck is installed on the frame. The wet joint of expansive concrete is cast in place, and the shear stud on the steel beam is formed as a whole. High strength bolts are used to connect each member of steel beam, beam section and beam section, and the accuracy of assembly is very high.
the steel box at the start section of the bridge steel is 22m long, with 7 beams and 48 deck plates. The internal structure of the side steel box is complex, and the longitudinal and horizontal baffles, supporting stiffeners and damper stiffeners are interlaced. After assembling, the total weight is 460t. Considering the technical characteristics and site construction conditions, a kind of stents with the function of "lifting and sliding" is developed on the basis of the tower cap, which realizes the target of the steel beam in the starting section and the vertical pull in the position.
steel beam standard section 12.0m, maximum beam net weight 217.4t. In order to prevent the impact of the Yellow River flood in the process of steel beam spelling, reduce the risk of construction safety and reduce the construction input of temporary steel Zhanqiao, through comparison and optimization of the construction scheme, the construction technology of cantilever assembling of steel mixed composite beam with single component "rotating beam on beam on the beam" is studied.