Gantry assembling method of gantry crane

The invention discloses a method for assembling a gate seat of a gate seat type crane, and aims to solve the problems that the relative position of each component is easy to deviate, the positioning is inaccurate, the assembling efficiency is low, the rework rate is high and the like when the gate seat of the existing gate seat type crane is assembled. Compared with the method that all parts are assembled in a scattered mode in existing door seat assembling construction, the door seat assembling method has the advantages that the structure of the door seat is reasonably decomposed into the first module, the second module, the main beam and the like to be assembled and manufactured respectively, the assembling precision of all the parts is easy to control, and the assembling difficulty is lowered; then, all the parts are folded and assembled, the whole folding and assembling process diffuses from low to high and from the middle to the two sides, layering is clear, the overall stability is high, operability is