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。

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The construction survey and control are the critical steps in assuring construction quality of a suspension bridge superstructure.

施工测量控制是悬索桥上部结构施工中保证施工质量的关键环节。

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Therefore, studies one kind to suit in the large-scale bridge building construction high accuracy control surveys and constructs the survey method to be extremely essential.

为此，研究一种适合于大型桥梁工程建设的高精度控制测量及施工测量的方法非常必要。

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This survey opened with a sight of the Vasco da Gama bridge, built to commemorate the 500th anniversary of the explorer's famous voyage of discovery.

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