2010年2月第39卷第2期
施工技术
CONSTRUCTION TECHNOLOGY
武汉天兴洲长江大桥梁模合一型移动模架设计
马涛，潘东发
（中铁大桥局股份有限公司，潮北武汉430050）
【摘要】武汉天兴洲公铁两用长江大桥引桥墩身宽达32.6m，同一墩身上布置两片40m长PC箱架，常规移动模架难以适用。为解决宽身妨碍移动模架走行过孔的技术难题，突酸了主梁与模板结构彼此分离、利用墩身两侧空间走行的传统设计理念，提出了主渠和部分外模板结构合二为一、结合正交异形板底模的新型移动模架方案。着重介绍新型移动模架的结构设计和结构计算，总结设计要点及技术特点。应用结果表明，梁模合一型移动模架刚度大、自重轻、操作简便、实用性强。
【关键调】桥聚工程；移动模架；梁模合一；设计
【中图分类号】U445
【文献标识码】A
【文章编号】1002-8498(2010)02-0043-04
Design of Moving Support System Integrating Girder with FormworkinWuhanTianxingzhouYangtzeRiverBridge
MaTao,PanDongfa
(China Major Bridge Engineering Co,,Lad.,Wuhan， Hubei430050,China)
Abstract:The pier shaft of approach bridge of Tianxingzhou Highway-railway Yangtze River Bridge is 32. 6m in width, with two 40-meter-long segments rested on its top. The normal moving support system is not practicable any more, as a result of the moving support system being obstructed by the pier shaft. The authors introduce & new type of moving support system which is characterized by integrating girder segment with partial external formwork and adoption of orthotropic plate as bottom formwork, which breaks through traditional design concept that the main girder is separated from the formwork and travels along the two outsides of pier shaft. This article focuses on the structural design and calculation of the new-type moving support system, and summarizes key points for design and technical characteristics.The application shows that the moving support system integrating girder with formwork is of high rigid, less self-weight and easily operative.
Key words: bridge engineering; moving support system;integrating girder with formwork ;design
染模合一型移动模架是一种新型移动模架，突破了主梁和模板被此分离的传统设计理念，将移动模架的主梁和部分外模板设计成同一结构体，结合低高度的正交异形板平开式底模，使移动模架过孔走行完全利用嫩顶以上空间，从而解决宽墩身妨碍移动模架走行过孔的技术难题。本文结合武汉天兴洲公铁两用长
江大桥工程，介绍梁模合一型移动模架的设计。 1工程概况
武汉天兴洲公铁两用长江大桥引桥跨径为 40.7m，部分为公路、铁路合建。下层为40.6m等高度预应力混凝土简支箱梁（铁路），上层为等高度预应力混凝土连续箱梁（公路），均为左右两幅箱梁并行。铁路桥面为正线四线设计，客运专线桥面宽13.4m，I级
万方数据
43
干线桥面宽12.3m。铁路箱梁采用单箱单室结构，架高3.59m，C50混凝土，纵、横双向预应力，箱架自重.1250~1300t。平面上，公铁合建段还经过缓和曲线和圆曲线，铁路箱梁为直线梁。铁路身采用板式墩身，最大宽度达32.6m，高25~35m；墩上设有公路M形框架墩。板式墩墩顶到铁路箱渠底面的最小距离为 0.916m。引桥公铁合建段典型横断面布置如图1所示。本工程公铁合建段铁路箱梁采用移动模架法施工，其难点在于：铁路墩身的宽度很大，超过了两幅铁路箱宽度之和，因常规移动模架过孔时，需要利用墩
【收稿日期】2009-08-15
【作者简介】马薄，中铁大桥局股份有限公司高级工程郸，工程技术部副部长，武汉市汉阳大道38号大桥局工程技术部 430050，电话：(027)84596761,E-mail;zzmt518@ 163,com