体外预应力技术在临时超载钢桁梁结构加固中的应用

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江苏北部某跨船闸的公路钢桁架简支桥于1990年4月竣工,主跨23m,桁架高度为2.3m,为全焊钢桥,桥面采用焊接技术形成正交异形板形式,桥面板在横梁两端与主桁架焊接成整体.该桥的设计荷载等级为标准汽-10级.由于附近新建桥梁施工有50t的超重材料车通过该桥,须对原桥进行加固处理.鉴于该桥是船闸通行桥兼城乡交通线,平时桥下有船只繁忙通行,桥上有乡村小卡车与公共汽车通行,加固时既不能影响水上船只通行,也不能中断陆上交通,加固要求高.
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