... 桥梁浅基防护 unsafe depth foundation protection 桥梁上拱度 camber of bridge span 桥梁实验车 bridge test car ...
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To install the crane span before installation, camber, level of metal structure of main girder bending, trolley rail height difference, gauge deviation, diagonal bridge survey.
安装前要对起重机安装跨度，金属结构主梁的拱度、水平旁弯，小车轨道高低差、轨距偏差，桥架对角线等进行测量。
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