郑徐高速铁路徐州特大桥上跨陇海铁路段施工关键技术  

Key Technologies for Construction of Xuzhou Super Large Bridge of Zhengzhou-Xuzhou High-speed Railway Overpassing Lanzhou-Lianyungang Railway

作　　者：张帆 徐子涵 张雅僮 ZHANG Fan;XU Zihan;ZHANG Yatong(China Railway Engineering of Zhengzhou Seven Innings Group Co.,Ltd.,Zhengzhou 450052,China;China Railway Seventh Bureau Group Co.,Ltd.,Zhengzhou 450016,China)

机构地区：[1]中铁七局集团郑州工程有限公司,郑州450052 [2]中铁七局集团有限公司,郑州450052

出　　处：《高速铁路技术》2022年第6期106-112,共7页High Speed Railway Technology

摘　　要：本文结合郑徐高速铁路徐州特大桥上跨陇海铁路段工程,研究了桩基承台施工对邻近铁路路基的扰动、桥梁转体和桥上铺设CRTSⅢ型无砟轨道道床的施工关键技术,结果表明:(1)无线沉降信息化监测能弥补常规埋设沉降观测点法不足,提前预知既有线路基变形实施早预防;(2)万能复合支架体系和拆卸吊运机设计节省了材料、缩短了搭拆时间;楔形铁支垫和转体保险辅助装置避免了转盘撑脚与滑道顶紧、转盘不能转动的问题;先边跨后中跨合拢和墩顶预偏措施克服了墩底产生的负面弯矩和剪力、梁体变形的问题,发明了跨障碍宽幅转体桥梁合拢段吊架法模板支撑体系施工方法;(3)CRTSⅢ型板式无砟轨道底座板伸缩缝灌注防污处理和隔离层土工布铺设方法、自密实混凝模板工装和移动式灌注台车确保了CRTSⅢ型板式无砟轨道铺设质量。研究结论可为上跨既有铁路高速铁路转体桥梁工程施工提供指导和借鉴。Based on Xuzhou Super Large Bridge of Zhengzhou-Xuzhou High-speed Railway overpassing LanzhouLianyungang Railway,this paper studies the disturbance of pile foundation pile cap construction to adjacent railway subgrade,bridge swivel and key construction technologies for laying CRTS Ⅲ ballastless track bed on the bridge. The results show that:(1)Wireless settlement information monitoring can make up for the shortcomings of the method of conventional embedding of settlement observation points,and predict the subgrade deformation of existing line for taking preventive measures as early as possible.(2)The design of universal composite support system and detachable lifting machine saves materials and shortens the erection and disassembly time;The wedge-shaped iron pad and swivel safety auxiliary device avoid the problem that the turntable support leg is tightly pressed against the slideway,causing the turntable unable to rotate. The measures of side span closure before mid-span closure and pier top pre-deflection avoid the negative bending moment,shear force and beam deformation at the pier bottom. The construction method of formwork support system by hanger method for the closure section of wide swivel bridge crossing obstacles is invented.(3)The anti-fouling treatment for pouring expansion joints in CRTS Ⅲ slab ballastless track base slab,laying of isolation layer geotextile,selfcompacting concrete formwork tooling and mobile pouring trolley ensure the laying quality of CRTS Ⅲ slab ballastless track.The research conclusion can provide guidance and reference for the construction of the swivel bridge overpassing the existing high-speed railway.

关 键 词：上跨既有铁路段 路基沉降监测 桥梁转体 桥上CRTSⅢ型无砟轨道道床 关键技术 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]