MG20/5t double girder gantry crane girder construction technology What?

About MG20/5t double girder gantry crane, its main beam construction process, including what it has? Here we have to introduce this knowledge, so that the reader door Steel cranes have a better understanding, as follows.
1 main beam structure of the technical requirements
(A) a single main beam mounting trolley track, the high arch should be 43.2-67.2mm, horizontal bending of ± 16mm.
(2) the level of the main beam tilt plate 4mm, girder webs vertical tilt 8.4mm.
(3) the entire main beam Camber camber curve and the curve should be smooth and should match the selected parabola.
(4) If the web generate waves deformation, will have to detect, measure the length of 1m, and the waves of compression zone shall not exceed 3mm,overhead gantry crane wavy tension zone shall not exceed 7mm.
(5) on the cover of wave transformation is less than or equal to 3mm.
(6) cover the upper and lower transverse girder splice weld seam stitching with transverse webs to be staggered over a distance of 200mm; girder webs under the cover and pull the area affected should penetration butt welds and to meet the quality requirements.
(2) preparation
(A) on the cover
a. cutting capacity should be lengthened 140mm, plate width tolerance <2mm, use flame cutting.
b. if the cover after cutting or horizontal wavy deformation curve should be used in a range of corrective leveling means.
(2) Under Cover
If the lower cover after cutting or horizontal wavy deformation curve should be used in a range of corrective leveling means.
(3) Main (Vice) web
a. 1m square feet with a review board of wave transformation, more than 3mm will have to re-corrected.b. According to the web material No. Camber camber curve and the curve of the list, find out the baseline.
c. No. webs material feed oil pen to write the order number and the reference mark, and then use flame cutting.
(3) Other
(1) rib plate shears for cutting, hoist crane requires adjacent angle of 90 degrees.
(2) the main beam joints before the plates can be pre-drilled holes in the rocker under drilling.