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。
General bridge crane lifting trolley generally, Bridges run organization, structure and composition of metal bridge.
普通桥式起重机一般由起重小车、架桥运行机构、桥架金属结构组成。
Double-trolley bridge crane is a kind of bridge crane.
双小车桥式起重机是桥式起重机的一种。
Double-trolley bridge crane is a kind of bridge crane.
双小车桥式起重机是桥式起重机的一种。
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