荆岳长江公路大桥设计

Design of Jingyue Changjiang River Highway Bridge

根据荆岳长江公路大桥桥址处自然环境条件,主桥采用主跨816 m双塔双索面六跨不对称混合梁斜拉桥;桥塔为双柱H形,北塔采用双圆形分离式基础,南塔采用矩形分离式承台+群桩基础;主梁采用分离式双边箱梁结构,中跨和北边跨采用扁平钢箱梁结构,南边跨采用PC箱梁结构,钢-混凝土结合段采用带钢格室的部分连接填充混凝土方案;斜拉索采用外缠PVF氟化膜的高强平行钢丝索,除桥塔附近几对大倾角斜拉索直接锚固在混凝土塔壁齿块上外,其余均采用钢锚梁锚固型式。

In the light of the natural environment conditions at the site, the main bridge of Jingyue Changjiang River Highway Bridge is designed as a asymmetric six-span hybrid girder cable-stayed bridge with double pylons, double cable planes and with a main span 816 m. A pylon of the bridge is the double-column H-shape pylon. At the north pylon, the foundation is the separated double circular foundations while at the south pylon, the foundation is the separated rectangular pile caps plus group pile foundation. The main girder is the separated double edge box girders structure. Over the central span and north side span, the flat steel box girders are arranged and over the south side span, the prestressed concrete box girder is arranged. The steel and concrete joint sections nearby the pylons employ the steel cellular structure connections that are filled in with concrete. The stay cables are made up of high-strength parallel steel wire strands wrapped with PVF fluorinated membranes. With the exception that several pairs of the stay cables having great inclination angles nearby the pylons are directly anchored to the sawtooth blocks in the concrete walls of the pylons, the rest of the cables are anchored by means of steel anchor beams.