For MG20/5t double girder gantry crane bridge technology introduction that

MG20/5t double girder gantry crane bridge process is a process in which an important part, but also the manufacturer and the operator must grasp the contents of the double girder gantry crane a lot of content, today Xiaobian to introduce some of the content , so we have a rough idea, as follows.1 Technical requirementsGirder camber :43-67mm;Girder cantilever bend degree :31-48mm;Bridge horizontal bending: ≤ 8mm;Cover horizontal main beam deflection: ≤ 6mm.Main beam cover waviness: ≤ 3mm;Girder webs vertical deviation: ≤ 9mm;Trolley tracks with poor sections: ≤ 3mm;Bridge diagonal difference: ≤ 5mm;Gauge Tolerance: ± 3mm;Centerline of the track and the web centerline position deviation: ≤ 6mm;Car outside the track fitting height difference: ≤ 1mm;Rail joints Lateral dislocation: ≤ 1mm;Rail joint gap: ≤ 2mm.2 main beam and upper beam assembly and welding(1) In the main beam webs cover the main center line,hoist gantry crane draw and identify good legs centers and span center, then locate the two main beam welding using the legs of the cover in place.(2) at both ends of the main beam assembly position to draw lines, upper beam and the main beam welding under the cover note welding sequence, can be GMAW or SMAW.3 track assembly and welding(A) before assembly trolley tracks, rust on the bottom to brush.(2) the relevant parameters and deviations checks should meet the requirements.(3) assembling trolley tracks, pay attention to the track center line of the main web centerline deviation, the track should be pressed in the cover plate, using tack welding.(4) track plate for welding, if the main beam camber is small, you should use the jacking welding. After welding, remove the jack, remove residual.4 main beam lower flange welded base plate assembly(1) Check the correction of the whole bridge, to meet the requirements to assemble the lower flange welded base plate.(2) the standard instrument to measure the main beam flange draw the horizontal position of the seat plate line, cut off the excess part of the flame.(3) the main beam center line has lead to the support legs of the side frame plate, and then measuring bridge spans. eot crane Then cross the center line of the flange seat plate frame plate surrounded centerline coincides for tack welding.(4) welded flange base plate, should be horizontal and then vertical.5. Inspection and acceptance(A) one by one to check if there is non-compliance should be adjusted or corrected.(2) all connected components have the product number and serial number of the seal parts are joined.