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一台NK-160型16t汽车起重机发生倾翻事故,第3级伸缩臂严重折弯,见图1。我厂承担了修复,并取得了成功。1 修复方案1.1 臂架整形和局部加强臂架截面为封闭式薄壁箱形结构,见图2。当臂架产生严重折弯时,一般上下盖板都产生塑性变形,一端盖板拉弯,另一端盖板受压失稳向内折皱变形。受压向内折皱变形的盖板,因变形严重无法修复,拟在纵向尽可能小的范围内,沿腹板边缘将折皱变形的部分成矩形切下。然后对整
A Tilting accident occurred on a NK-160 16t truck crane, with the Grade 3 telescopic boom severely bends (see Figure 1). I plant assumed repair, and achieved success. 1 repair program 1.1 Boom shaping and local strengthening boom section is a closed thin-walled box-shaped structure, shown in Figure 2. When the boom has a serious bend, the upper and lower cover are generally plastic deformation occurs, one end of the cover plate bending, the other end of the cover plate buckling deformation under pressure. Compression inward buckling deformation of the cover, due to severe deformation can not be repaired, intended to be in the longitudinal as small as possible, along the edge of the web will be cruciate deformed rectangular cut-off. Then the whole