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.
The ridge of the gable was designed on the diagonal line and ceilings' height difference was given as if twisting from the south to the north.
山墙脊呈对角线设计，天花板高度不同，就像空间从南面向北面扭曲。
3
The diagonal current sum or difference of compound bridge has been regarded as output, its quantity can be selected as the larger or the smaller measured variable automatically.