高铁连续梁0号块反支点预压施工技术研究  

Construction Technology of Preloading with Reverse Fulcrum for No.0 Block of High-speed Railway Continuous Girder

作　　者：刘伟 Liu Wei(Digital Technology Branch of China Railway 14th Bureau Group Logistics Co.,Ltd.,Jinan,Shandong 250000)

机构地区：[1]中铁十四局集团物流有限公司数字科技分公司,山东济南250000

出　　处：《现代工程科技》2025年第3期69-72,共4页Modern Engineering Technology

摘　　要：高速铁路连续梁0号块大多采用支架法、托架法施工,均须对支架和托架进行预压,目前传统施工多采用堆载预压法,但由于高速铁路连续梁0号块高度大、体积大、长度短,采用传统的堆载预压方法受限大,难以有效模拟实际荷载分布。丰台站改建工程京广特大桥采用钢绞线反支点预压施工技术对0号块支架进行预压,以消除非弹性变形,保障其安全性。研究结果显示,该方法有效解决了堆载预压法堆载高度高、投入大、安全风险高、施工难度大等问题,在保证安全性的同时,提高了工作效率,减少了投入,取得了良好的经济效益和社会效益,适合广泛推广应用。Most of the No.0 blocks of continuous girders on high-speed railways are constructed by the support method and the bracket method,and both the supports and brackets need to be preloaded.Currently,the traditional construction mostly adopts the surcharge preloading method.However,due to the large height,large volume and short length of the No.0 blocks of continuous girders on high-speed railways,the traditional surcharge preloading method is highly restricted and difficult to effectively simulate the actual load distribution.The steel strand reverse fulcrum preloading construction technology was adopted for preloading the No.0 block support of the Jingguang Grand Bridge in the reconstruction project of Fengtai Station to eliminate non-elastic deformation and test its safety.This effectively solved the problems of high surcharge height,large investment,high safety risks and great construction difficulties in surcharge preloading.While ensuring safety,it improved work efficiency,reduced investment,and achieved good economic and social benefits,which is suitable for wide promotion and application.

关 键 词：支架 堆载预压 钢绞线 反支点 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]