Key Technology Study And Practice On Main Beam Construction Of Jinghai Gulf Cable-stayed Bridge In Weihai City

On the Shandong province Weihai city sea highway, across Wendeng, Rongcheng at the junction of the Jing waters of the Gulf Bridge project of bridge tower, beam, pier and the consolidation system of cable-stayed bridge girder construction practice. In the post tensioning method in construction of prestressed strand C60high strength concrete the Pi-shaped beam process, the cable girder anchorage point elevation end with the corresponding cable force numerical, directly affect the bridge deck system the carriageway of the flatness and the comfort of a passenger standard value, and the influence of cable-stayed bridge using life limit. Therefore, in the construction of main girder of cable-stayed girder process, end anchor elevation and cable force, the two data to be monitored and controlled, referred to as the cable-stayed bridge construction state of the" double control".Analysis and Research on the construction of dynamic situations, U-shaped girder section on the internal force:first from the beam of prestressed steel stranded wire tensioning, transverse section of concrete the preload pressure; followed by cable hanging cable, tensioning, will produce stress levels, i.e., the horizontal component of cable, as well as main girder and the hanging basket structure of itself gravity self weight, during construction of the temporary loading caused by bending moment.From a computational analysis of the data found:cable hanging thirteenth on cable, and a pull after.Finally the article proposed three conclusions:One, main girder of cable-stayed bridge during the construction process, deal with the cable girder anchorage points and end corresponding to the cable force of double control", it can ensure that the cable-stayed bridge deck longitudinal, lateral line system standards, bridge after the project is completed, the passenger to feel safe and comfortable, and can lengthen the cable-stayed bridge using life limit;In two, the Pi-shaped beam, in construction state, not bending members, but with pressure mainly bending component;In three, the main rib Bridge No.7section size bias discriminant results:section belongs to large eccentric compression state of stress. Namely the Pi-shaped beam of cable-stayed bridge rib, in construction state of stress and the traffic operation period has substaintial distinction.