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。
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.
双层金属结构低温储罐的安装工艺主要有正装法和倒装法。
The installation technique for low temperature storage tank with double layer metal structure is mainly divided into normal assembly method and inverted assembly method.
这个区域的屋顶的类型应符合安装地点条件的要求，使用金属结构支撑；
The area's roof shall be of the type required by the installation site conditions and shall be supported by a metallic structure;
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