Construction method of giant multi-cavity steel structure transfer beam system

The invention discloses a construction method of a giant multi-cavity steel structure transfer beam system. The construction method comprises the steps that construction simulation is conducted through finite element software, and a supporting scheme, a closing scheme, a deformation control scheme and an unloading scheme are confirmed through simulation analysis; a standardized supporting jig frame temporary supporting system is arranged in a structural beam area on the lower layer of the construction layer; and then the unit components are sequentially installed from east to west, and overall splicing and temporary fixing are completed. According to the design and deformation control requirements, welding is sequentially completed through the welding robot technology till closure is achieved; after a complete stress system is formed, the supporting system is unloaded, and the stress system conversion of the giant transfer beam structure is completed; and finally, the temporary supporting system is removed. I