嘉鱼长江公路大桥桥塔设计  

Design of Pylons of Jiayu Changjiang River Highway Bridge

作　　者：贺鹏 王成启 HE Peng;WANG Cheng-qi(Hubei Transport Planning and Design Institute Co.,Ltd.,Wuhan 430051,China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430051

出　　处：《桥梁建设》2018年第4期84-89,共6页Bridge Construction

摘　　要：嘉鱼长江公路大桥主桥为主跨920m的双塔单侧混合梁斜拉桥。该桥桥塔采用钻石形混凝土结构,由上、中、下塔柱,中上、中下塔柱结合段,下横梁和塔座构成,北塔高235m、南塔高251.41m,两塔下横梁以上结构保持一致。该桥北塔、南塔各有30对斜拉索,第1和第2对斜拉索在塔壁混凝土齿块上直接锚固;第3~30对斜拉索锚固采用"钢锚梁+钢牛腿"的形式,钢锚梁采用单锚梁结构,1根锚梁锚固4根斜拉索。为减小超高桥塔常见的混凝土开裂病害,在桥塔混凝土中掺入聚丙烯腈单丝纤维、聚丙烯粗纤维进行防裂抗裂处理。针对北塔下塔柱较短、下塔柱和下横梁受力不利的情况,经方案比选,采用先浇部分下横梁的施工方案,有效减小下横梁混凝土收缩开裂的风险。The main bridge of Jiayu Changjiang River Highway Bridge is a one-side hybrid girder cable-stayed bridge with double pylons and with the main span of 920 m.A pylon of the bridge is the diamond-shape concrete structure consisting of the upper,middle and lower pylon columns,the middle and upper and the middle and lower pylon column joint sections,the lower cross beam and the pylon column bases.The height of the north and south pylons is respectively 235 m and 251.41 m.The structures of the two pylons above their lower cross beams are kept identical.On the north and south pylons,each 30 pairs of the stay cables are to be anchored,of which the1 st and 2 nd pairs of the cables are directly anchored to the sawtooth concrete blocks on the pylon walls while the 3 rd^30 th pairs of the cables are anchored to the steel anchor beams＋steel corbels in the pylons.A steel anchor beam is the single anchor beam structure and on each anchor beam,4 cables are anchored.To minimize the concrete cracking problems commonly encountered in the high pylons,the polyacrylonitrile monofilament fibers and polypropylene coarse fibers are added to the concrete of the pylons of the bridge to prevent and resist the cracking of the concrete.In regard of the facts that the lower columns of the north pylon are short and the lower columns and lower cross beam of the pylon are to be in the unfavorable load bearing conditions,the construction scheme of casting part of the lower cross beam first is selected through comparison of several schemes and with the selected scheme,the risk of the shrinking cracking of the concrete of the beam is to be effectively reduced.

关 键 词：斜拉桥 桥塔 塔型 索塔锚固区 钢锚梁 结构设计 合成纤维混凝土 施工方案 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]