高铁连续梁转体不锈钢壳合龙施工技术

Construction Technology for Swivel Stainless Steel Shell Closure of High Speed Rail Continuous Beam

高铁连续梁转体跨越既有铁路、公路、市政道路等立交结构物为首选施工技术,转体的跨度、宽度、吨位、角度等不断在刷新记录,高铁转体上跨既有铁路因纵坡、限界、净高等影响,梁底与接触网承力索距离极其有限,如何在这样的条件下安全可靠进行合龙,是需要解决的难题。依托南玉铁路福庆特大桥跨湘桂铁路双线转体实践,首次采用不锈钢壳合龙技术,较好解决了上跨既有铁路转体桥中合龙施工、钢壳生锈、安装困难等难题,为类似转体桥中跨合龙施工提供了新的解决方案,是一种技术创新,推广价值较高。

The preferred construction technology for high-speed railway continuous beam turning over existing railway,highway,municipal road and other overpass structures is the turning.The span,width,tonnage,angle,and other aspects of the turning are constantly breaking records.Due to the influence of longitudinal slope,clearance,and net height,the distance between the beam bottom and the catenary cable is extremely limited when the high-speed railway turning over the existing railway.How to safely and reliably close under limited conditions is a difficult problem that needs to be solved.This article relies on the practice of the double track turning of the Fuqing Special Bridge on the Nanyu Railway crossing the Hunan Guangxi Railway,and for the first time adopts the stainless steel shell closure technology,which effectively solves the problems of the middle closure construction,steel shell rust,and installation difficulties of the upper span existing railway turning bridge.It provides a new solution for the construction of the middle span closing of similar turning bridges,which is a new technological innovation and has high promotion value.