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。
The points of hoisting design of semi-span gantry crane are analyzed. The construction schemes, methods and safety of T-shaped beam hoisting are introduced.
分析了半跨龙门吊的设计安装要点，着重介绍了T梁的吊装施工组织方案、施工方法及安全技术保证措施。
General gantry crane: the most extensive use of this crane can carry a variety of items and bulk materials into, from the weight of 100 tons, a span of 4 to 35 meters.
普通龙门起重机：这种起重机用途最广泛，可以搬运各种成件物品和散状物料，起重量在100吨以下，跨度为4 ~ 35米。
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