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 crane dismantles another section of the fixed service structure on Launch Pad 39B at NASA's Kennedy Space Center in Florida.
佛罗里达周NASA肯尼迪航天中心，一个吊车正在拆卸39B号发射台固定支撑结构的另一部分。 拆除旋转服务结构（RSS）的工作仍在继续。
The strength design of the tower crane structure is mainly to ensure that the metal structure part meets the strength condition in the work process.
塔式起重机结构的强度设计主要是确保金属结构部分在工作过程中满足强度条件。
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