受空间约束时曲线钢箱梁步履式多点顶推策略  

Hydraulic-walking Multi-point Incremental Launching Strategy for Curved Steel Box Girder Under Spatial Constraint

作　　者：韩慧超 吕之豪 朱伟庆[2] 武轶彬 张小利 HAN Hui-chao;LÜZhi-hao;ZHU Wei-qing;WU Yi-bin;ZHANG Xiao-li(China Second Metallurgy Group Corporation Limited,Baotou,Inner Mongolia 014010,China;School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China)

机构地区：[1]中国二冶集团有限公司,内蒙古包头014010 [2]长安大学公路学院,陕西西安710064

出　　处：《公路交通科技》2024年第9期160-171,共12页Journal of Highway and Transportation Research and Development

基　　金：陕西省高校科协青年人才托举计划(20180409);陕西省自然科学基础研究计划项目(2019JM-172);长安大学中央高校基本科研业务费专项资金项目(300102212912)。

摘　　要：针对曲线钢箱梁多点步履式顶推同步控制难度高、往往受到各类空间约束限制的难题,为提高顶推施工的精确性与可靠性,应充分降低曲线顶推施工过程中的多点异向和异速顶推工况次数,根据尽量使得顶推过程中曲线箱梁各点顶推方向与速度相同这一基本原则,提出了受空间约束时曲线钢箱梁以平移和纠偏为主,旋转与调整为辅的顶推策略和方法,建立了各基本工法对应的顶推数学模型,并将其成功应用于兰州市某非对称曲线斜拉桥的钢箱梁顶推施工。研究结果表明:随曲线钢箱梁顶推行进,理论计算出的梁体尾部偏差值逐渐变大、梁体所需旋转角度逐渐变小,故曲线钢箱梁顶推初期宜多次采用旋转工法减小曲线夹角,后期宜多次采用纠偏工法减小轴线偏差;调整工法可有效减少其余工法的实施次数,其计算流程独立于其他工法,只与当前曲线钢箱梁到达的临时墩所在平面位置有关;曲线钢箱梁即将穿越桥塔等空间障碍物时,梁体与障碍物碰撞风险最大,而随顶推进程的继续,梁体与障碍物碰撞风险会逐步降低;该曲线钢箱梁顶推策略与方法思路明确、可操作性高,可大幅降低对多点步履式顶推系统的要求,提高顶推施工可靠性,适用于市政桥梁的曲线钢箱梁步履式顶推施工。Facing the synchronization control problem and various spatial constraints during the multi-point incremental launching of curved steel box girders,to improve the accuracy and reliability of incremental launching construction,the application frequency of incongruous multi-point incremental launching conditions with different moving speeds and directions should be minimized.On the principle,launching speed and direction of different points should be tried to be consistent,the incremental launching strategy and method were proposed when the curved steel box girder was constrained by space.The translation and rectification were the main parts;the rotation and adjustment were the auxiliary parts.The mathematical models of incremental launching corresponding to each basic engineering method were established.The strategy was used successfully in the incremental launching construction of steel box girder of an asymmetrical and curved cable-stayed bridge in Lanzhou city.The result indicates that with the launching construction progress,the calculated deviation at the end of girder increases,and the required rotation of girder decreases.In the initial stage of curve steel box girder incremental launching,the rotation method should be used for many times to reduce the included angle of curve.In the later stage,the correcting deviation method should be used for many times to reduce axis deviation.The adjustment effectively reduces the applying numbers of other construction methods,and its calculation is independent of the latter.It relates only to the plane position of temporary pier where the current curved steel box girder arrives.When the curved steel box girder is passing through the spatial obstacles,such as bridge pylons,the collision risk between girder and obstacle is the highest;as the launching process continues,the risk gradually decreases.The proposed incremental launching strategy for curved steel box girders has clear technical route and strong operability,significantly reducing the requirement on the multi-po

关 键 词：桥梁工程 顶推策略 数学模型 曲线钢箱梁 步履式顶推 空间约束 

分 类 号：U445.34[建筑科学—桥梁与隧道工程]