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.
如是垫在主梁下，则除主梁上拱度一项外，其余项目也都可以检查，同时还可以检查大车运行机构的安装质量。
If the cushion in the main beam, in addition to the main beam camber, the rest of the project can also be checked, but also can check the installation quality of the operating mechanism of the cart.
通过对先张法预应力梁板预拱度产生的过程进行分析，揭示预应力梁板预拱度产生的内在原因。
The paper analyses the formation process for pretensioning prestressed hollow plank precamber, announces inside reason for prestressed hollow plank precamber to public.
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