English：

An innovative construction technology and application scheme are proposed for the upper wideand lower narrow circular cantilever structure. Adopting the logic of lower first, upper follow⁃up, andstep⁃by⁃step construction, the construction of the lower cantilever structure is completed by setting up aradiation⁃type triangular bracket⁃type operating platform. Subsequently, the construction of some upperstructures is realized by relying on the lower cantilever structure. Then, the lower construction platform isextended after the upper structure is tied by the steel wire rope, and finally the construction of the upperremaining cantilever structure is completed. Combined with a launching tower project in Xi’an, the keytechnology of cantilever structure construction is described in detail. The finite element analysis is carriedout by ABAQUS software to verify the overall mechanical performance of the construction platform of thecircular cantilever structure under the unloading state of the wire rope. The results show that the stress ofthe circular cantilever support frame meets the requirements.