Gantry crane girder hoisting construction method

The invention discloses a hoisting construction method for a main beam of a portal crane. The hoisting construction method comprises a hoisting construction process of hoisting the main beam on the basis of constructing a main beam hoisting system of the portal crane. On the basis of a main beam hoisting system of the portal crane, when a main beam is hoisted and lifted, a wind cable A, a wind cable B, a wind cable C and a wind cable D converge and intersect on ground anchors on the two sides and the middle of a track; the main beam of the portal crane is not prone to making contact with the wind cable A, the wind cable B, the wind cable C and the wind cable D to cause interference, and the problem that due to the fact that the lifting frame is located on the inner side of the supporting leg, the main beam of the portal crane can make contact with and collide with the lifting frame in the lifting process, and the lifting efficiency is affected is solved. 本发明公开了一种门式起重机主梁吊装施工方法，包括：以构建出门式起重机主梁吊装体系为基础将主梁起吊的吊装施工过程