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1病害概况 符夹线上线铁路特大桥于1988年修建,中心里程符夹下行K4+049,全长1642m,该桥共98孔,其124.0m下承板梁1孔,16m预应力铪梁95孔,10米普通铪梁2孔,共有矩形桥墩97个。该桥自1994年检查发现矩形桥墩表面混凝土保护层逐渐出现了裂纹、疏松、胀彭、脱落等现象,造成主筋外露且锈蚀严重,部分箍筋锈断。通过对裂纹注射酚酞溶液及使用超声仪测量,我们发现大部分桥墩碳化深度已发展到钢筋表面。自1994年至2002年墩身砼保护层出现裂纹、疏松胀鼓的共有91个桥墩,而出现墩身主筋锈蚀的桥墩达67个,病害发展逐年增加,已危及到运营安全。
A disease profile Folders online line railway bridge was built in 1988, the center mileage folder down K4 + 049, a total length of 1642m, the bridge a total of 98 holes, the 124.0m under the plate girder 1 hole, 16m prestressed hafnium beam 95 Hole, 10 meters ordinary hafnium beam 2 holes, a total of 97 rectangular piers. The inspection of the bridge in 1994 found that cracks, looseness, flattening and peeling occurred gradually on the concrete protective layer on the surface of the rectangular pier. As a result, the main reinforcement was exposed and the corrosion was serious and part of the stirrups were rusty. Through the injection of phenolphthalein solution into the crack and the use of a sonicator, we found that most of the pier carbonization depth has been developed to the steel surface. From 1994 to 2002, there were 91 bridge piers with cracks and loose bulging bulges, while 67 piers with corroded main stem reinforcement appeared. The disease development increased year by year, which has endangered operational safety.