46
DOI:10.7672/sgjs2016110046
施工技术
CONSTRUCTION TECHNOLOGY
2016年6月上第45卷第11期
上跨多股既有铁路钢筋混凝土连续梁桥综合施工技术
隋渤海
（中铁十四局集团建筑工程有限公司，山东济南250014）
[摘要]预应力混凝土连续梁桥广泛应用于跨河流、山谷、公路、铁路的桥梁设计中。上跨铁路构造物一股跨度较大，施工工艺较为复杂；电气化铁路接触网电压高达2.75万V，施工时安全风险高，根据跨铁路既有线施工安全管理规定的要求，必须设置具有防高空坠物及防电绝缘的防护装置。以高月塘大桥为工程实例，详细介绍了墩项临
时固结方案设计与施工，以及防护方案比选，包括移动吊挂式防护平台方案设计与施工工艺。【关键词】桥梁工程；预应力混凝土；既有铁路；连续梁；防护平台；施工技术
［中图分类号］U445.4
【文献标识码］A
【文章编号］1002-8498(2016)11-0046-04
ComprehensiveConstructionTechnologyofReinforcedConcrete Continuous Girder Bridge Across Existing Multi Railway Lines
Sui Bohai
(China Raileay 14th Bureau Group Construction Engineering Co. ,Lid., Ji'nan,Shandong250014, China)
Abstract:Prestressed concrete continuous girder has been used in design of bridges across river,valley, road and railway comprehensively. The construction across railway usually has long span and its construction is complex. The contact wire of electrified railway reaches 27 500 volt, so its security risk is very high. According to the construction security administrative provisions across exiting railway, protecting devices and insulator arrangement must be set up. Combined with the case study of Gaoyuetang Bridge, this paper introduces the construction techniques of the temporary rigid connection on pier top and the mobile suspension type protecting stand in details.
Key words:bridges; prestressed concrete; existingrailway; continuous girders; protection platforms : construction
工程概况 1
湘潭市东二环高月塘大桥为上跨沪昆正线（上下行双线）、湘潭东站牵引线、安全线及联络线5条铁路而设，沪昆铁路及湘潭东牵引线为电气化铁路，列车通行频繁，安全风险大。此桥全长776.9m，设计桥宽36m，分左、右两幅，单幅桥宽17.5m。主桥为（42+70+42）m连续梁形式，单箱双室结构，箱宽10.5m，两侧悬臂翼缘板宽3.5m，与沪昆线斜夹角85°，其中主跨为70m段预应力连续箱梁如图1 所示。
2总体方案简述
高月塘大桥主跨预应力钢筋混凝土连续梁采用菱形挂篮悬灌施工技术，0号块采用落地式钢管支架现浇工艺：墩项设计为橡胶支座，刚度不足、稳
[作者简介］隋渤海，工程师，E-mail:suibohai@163.com【收稿日期］2015-12-21
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主桥连续梁与既有线铁路相对位置（单位：cm）图1
Fig.1 Relative position between continuous girder on main bridge and exiting railway(unit :cm)
定性能差，墩顶利用0号块支架结合墩顶预留钢筋进行临时固结：既有铁路采用在菱形挂篮下方挂移动吊挂式防护棚进行防护。落地式支架及菱形挂篮较为常见，下面着重对墩顶临时固结工艺和移动