摘要
为避免铁路钢桁梁斜拉桥支座脱空影响列车运行安全,需采取有效措施控制结构负反力。以安庆铁路长江大桥为工程背景,研究一种可精确控制铁路钢桁梁斜拉桥负反力的结构和施工方法。安庆铁路长江大桥采用封闭钢箱灌注重晶石混凝土的方法集中压重。压重钢箱采用钢板封闭正交异性钢桥面底板,使其成为封闭的钢箱。横肋腹板采用变高度设计,可为封闭钢箱提供更大的压重空间。在密闭钢箱顶部设置混凝土灌注孔及观察孔,并在钢箱腹板及横梁腹板沿高度方向设置混凝土方量高度控制肋。采用现场灌注重晶石混凝土的方法,达到精确控制斜拉桥压重的目的。该方法具有构造简单、受力明确、压重效率高、施工方便的特点,已在国内多座铁路钢桁梁斜拉桥中推广运用。
It is necessary to take effective measures to control structure negative reaction of the railway steel truss cable-stayed bridge to avoid bearing separation which may endanger train running safety.Based on the project of Anqing Railway Yangtze River Bridge,a structure and its construction method which can precisely control the negative reaction were studied. The method is by pouring barite concrete into an airtight steel box to provide concentrate weight for overcoming negative reaction.The steel box is formed by enclose the orthotropic steel floor deck with steel plates.The steel box webs are of variable height to provide more space.Roof holes in the steel box were set for observation and pouring concrete.Some stiffeners were set on the webs of the steel box and transverse beams as control marks of concrete elevation. The precise control of the negative reaction was achieved by this method.The method is simple in structure,and is reasonable in load transfer. It also has high weight efficiency and construction convenience. It has been used in several railway steel truss cable-stayed bridges.
作者
徐科英
XU Keying(China Railway Major Bridge Reconnaissance ＆ Design Group Co. Ltd.,Wuhan Hubei 430056,Chin)
出处
《铁道建筑》
北大核心
2018年第6期29-31,共3页
Railway Engineering
关键词
铁路桥梁
负反力控制
结构设计
钢桁梁斜拉桥
封闭钢箱
重晶石混凝土
Railway Bridges
Negative reaction control
Structural design
Steel truss cable-stayed bridge
Airtight steel box
Barite concrete
