METHOD TO INCREASE RESOURCE OF CRANE GIRDER Russian patent published in 2014 - IPC B66C6/00 

FIELD: construction.

SUBSTANCE: invention relates to crane structures. To increase resource of a crane girder comprising upper and lower belts from T bars connected to each other by a vertical wall, where a longitudinal stiffening rib and inclined support ribs are fixed from a pair of angle profiles with horizontal flanges, elements of the crane girder structure are prepared, K-shaped processing of the T bar wall edges is carried out, through holes are pierced in the shelf of the T bar and in the sheet of the braking beam with regular pitch, using a rolling and bending machine, they process a sheet and form a pair of channel sections by longitudinal bends, forming a Z-shaped profile of cross section of the braking beam. Through holes are pierced and calibrated in design points with a regular pitch in the wall of the crane girder, which respond to the holes in the braking beam and in the T bar of the lower belt. Using gravity roll carriers, finished parts are transported to a line. In the lower position the wall of the T bar of the upper belt and the wall of the T bar of the lower belt are connected with a continuous seam with a wall of a crane girder, the connected elements are manipulated, burr and slag are removed from the root of both seams. Connected elements are transported to the next post of automatic welding, and in the lower position they finally connected the wall of the T bar of the upper belt and the wall of the T bar of the lower belt with the wall of the crane girder. The crane girder is connected with a Z-shaped braking beam, their calibrated holes are matched, alloyed pins are installed, and nuts are tightened in a mechanised manner using a wrench for the rated value, support ribs from angles or T bars are installed, using high-resource connections, and the finished crane girder is sent to a finished goods warehouse.

EFFECT: invention achieves increased resource of a crane girder.

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