Cracks occurred in the main weld joining the web and upper wing panel of an overhead crane girder of I-section, some of which have expanded to the structure material and even led to girder fracture.
桥式起重机采用工字形截面作为主梁，使用多年后该结构形式的主梁上翼缘板和腹板连接的主焊缝及母材多处产生裂纹，甚至发生主梁断裂事故。
The structure of high web is often adopted in the overhead launching gantrys main girder that are connected by the high-strength bolts.
造桥机主梁一般采用高腹板箱梁结构，主梁之间通过高强螺栓群相互连接。
Main diseases and reinforcement method of current box girder web plate are discussed, after years of service.
主要阐述了目前预应力混凝土连续箱梁在多年的运营中，箱梁腹板的主要病害及其加固方法。
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