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。
A new technique is put forward that high-low brace gantry crane wide double guiding girder method to construct bridge.
本文提出了高低支腿龙门吊宽幅双导梁法这种新的桥梁工程施工方法。
L single girder gantry crane is a bridge type, suitable for open storage for general cargo railway transport loading and unloading and lifting operations.
型单梁门式起重机属桥架型的一种，适用于露天仓库货铁路沿线进行一般的装卸及起重搬运作业。
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