高塔异形横梁劲性骨架及钢筋施工技术

Construction Technology of Stiffening Framework and Reinforcement of Special Beam of High Tower

洞庭湖大桥索塔上横梁设计为非典型性拱形结构,距离地面约200m,属高空高危作业。上横梁结构拱顶至拱角高差12m,由两个等半径圆曲线组成,坡度较陡,钢筋架设采用传统分区域绑扎作业时钢筋存放的稳定性及施工操作人员的平稳性较难保证,且吊装作业频繁,施工周期长,安全风险较大。上横梁底板及腹板钢筋的架设方式成为决定第一次混凝土浇筑时间的重要因素之一。主要介绍横梁劲性骨架及钢筋架设的方案比选、施工工艺、实施效果及优化措施。

The upper beam of the cable tower of Dongting Lake Bridge is designed as an atypical arch structure,about 200 m from the ground,which is a high-risk work.The height difference between the arch crown and the arch angle of the upper crossbeam structure is 12 m,which is composed of two equal radius circular curves.The slope is relatively steep.The stability of the steel bar storage and the stability of the construction operators are difficult to be guaranteed when the traditional zonal binding operation is used for the steel bar erection.Moreover,the hoisting operation is frequent,the construction period is long,and the safety risk is large.One of the important factors that determine the time of the first concrete pouring is the erecting way of the bottom plate and web reinforcement of the upper crossbeam;This paper mainly introduces the scheme comparison and selection,construction technology,implementation effect and optimization measures of beam rigid framework and steel bar erection.