2013年1月下第42卷
第2期
施工技
支术
CONSTRUCTION TECHNOLOGY
79
京沪高铁跨广阳道特大桥简支系杆叠拱拱肋安装技术*
毕永清
（中铁十七局集团第二工程有限公司，陕西西安710043）
【摘要】京沪高铁北京特大桥跨席坊市广阳道，设计为系杆叠拱结构。该结构临近既有京沪铁路，拱助安装危险性大。传统的碗扣架存在横向稳定性差、占用空间大等缺点，因此在施工前期制定方案时拱肋支架采用螺旋焊管，大大节约了桥面空间，并通过织向连接提高了整体性。重点介绍了拱肋支架搭设、拱脚施工、拱助安装横撑及K形撑安装、拱肋混覆土压注、系杆的安装与张拉等施工工艺以及焊接方案，取得了良好的效果。
【关键词】桥架工程；铁路；简支系杆；叠拱；拱助；安装
【中图分类号】TU758U445
【文献标识码］A
【文章编号】1002-8498（2013)02-0079-04
Installation of the Simply-supported Tied Overlapping Arch Rib for the Beijing-Shanghai Express Railway Bridge Spanning Guangyang Road
BiYongqing
(The 2nd Engineering Co. , Lud. of China Raileay 17 Bureau Group Corporation, Xi'an, Shaanxi 710043, China) Abstract : The Beijing Bridge of Beijing-Shanghai Express Railway spanning Guangyang Road of Langfang was designed as simply-supported tied overlapping arch structure. This structure is close the existing Beijing-Shanghai Railway, which imposed danger to the arch rib installation. Traditional cup-lock scaffold has the shortcomings of having poor transverse stability and occupying large space. Therefore, in the early phase of the construction, spirally-welded pipes were used as arch rib supports to save space, and integrity was improved by longitudinal connections. The construction technologies of setting arch rib supports, constructing the arch foot, installing transverse supports and K-shaped supports for the arch rib, pouring the arch rib concrete, installation and tensioning of tie bars, etc. are introduced in detail, The welding schemes are introduced as well, The proposed construction method achieved good effects. Key words:bridges; railways; simply-supported tie bar; overlapping arch; arch rib; installation
1
工程概况
京沪高铁北京特大桥在DIK55+056.3处以1
-71.5m简支拱跨廊坊市广阳道，结构物起里程为DIK55+026.93—DIK55+100.88；线路与广阳道斜交，交角为80°38'。
梁部采用双主梁的纵横梁体系，主梁梁高 2.8m，高跨比1/25.54，桥面板厚0.3m，端横梁高 2.8m、宽2.25m，小横梁高2m、宽0.3m，设4道小纵梁，小纵梁高0.8m、宽0.3m。
拱肋采用钢管混凝土叠拱，拱肋直径1m，上拱肋矢高15m，失跨比1/4.767，下拱肋矢高13m，失跨比1/5.5，上下拱肋中心线拱脚处高差2m，拱顶高差4m，拱肋内灌注C50补偿收缩混凝土，拱轴线采
：中国铁建股份有限公司科技研发项目（09-17C）
【作者第介】华永清，高级工程师，E-mail；bozzcq@zt17.cn【收日期】2012-04-10
万方数据
用二次抛物线，上下拱肋之间设联杆，联杆内不灌注混凝土，两拱肋中心距12m，拱肋之间的横向风撑采用外径850mm的钢管，斜向风撑采用外径700mm 的钢管，上、下拱肋各设1道一字形横撑和一对K 形横撑，梁上吊点间距5m，全桥设11对吊杆。拱部结构如图1所示。
上拱肋下携
品肝
共
模
图1系杆叠拱拱部结构
Tied overlapping arch structures
Fig.1
2施工现场特点
京沪高铁跨广阳道简支拱对应既有京沪线起里程为DIK70+983.93—DIK71+057.88。广阳道为廊坊市区主干道，车流十分密集，施工场地狭