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。
Bridge crane in use after period of time, can appear different degree of cart walk chew rail phenomena, especially used for many years of old bridge crane.
桥式起重机在使用一段时间后，会出现不同程度的大车行走啃轨现象，尤其是使用多年的陈旧桥式起重机。
Synopsis Biting rail is a common failure due to improper operation for the bridge crane.
在桥式起重机使用中常因使用不当出现车轮的啃轨现象。
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