水中大体积V型墩斜腿组合式支撑体系下施工技术研究  

Research on Construction Technology of Massive V-shape Pier in Water under Slant-leg Combined Supporting

作　　者：刘宝龙 

机构地区：[1]中铁三局集团有限公司,太原030001

出　　处：《铁道工程学报》2011年第3期52-57,共6页Journal of Railway Engineering Society

基　　金：铁道部科技研究开发计划重点课题项目(2007G007)

摘　　要：研究目的:针对铁路客运专线V型墩刚度大、线形精度要求高的特点,通过研究水中大体积V型墩斜腿施工时的支撑体系和混凝土浇筑方法,确保其线形精度小于1 cm,且斜腿根部不开裂。研究结论:(1)以桩基础与混凝土支墩作为竖向承力结构,以精轧螺纹钢水平预应力索作为抵消水平推力的综合承力体系保证了分层现浇施工期间V型墩斜腿大体积混凝土现浇时梁部小于1 cm的线形精度和斜腿根部不开裂。(2)一种可单端张拉的锚箱实现了对桥梁斜腿张拉时的无损伤;避免了端头搭拆专用工作平台,且张拉操作容易,保证了安全和快速施工,同时提供了作业人员良好施工环境。Research purposes：According to the characteristics of large stiffness and high requirement of the line shape of V-shape pier of passenger dedicated line,the research was done on the supporting system and casting method for construction of the massive V-shape pier and slant-leg to ensure that the line shape inaccuracy was within 1cm and the root of slant-leg had no crack. Research conclusions：（1） By taking the pile foundation and concrete supporting pier as vertical Load-carrying structure and taking the fine rolled twisted horizontal prestressed cable as comprehensive load-carrying system to offset horizontal thrust,it was ensured that the line shape inaccuracy of beam was within 1cm and the root of slant-leg had no crack during construction of massive concrete of V-shape pier and slant-leg.（2） By using a kind of one-end tensioned anchor box,the slant-leg could be tensioned without damage and it was unnecessary to build the working platform at the end of the pier.In addition,it was easy to do the tension work.In this way,the construction was more safe and faster,and the construction environment was better.

关 键 词：客运专线 V型墩 组合式支护 分层现浇 施工技术 

分 类 号：U448.142.5[建筑科学—桥梁与隧道工程]