RETRACTED: Prefabricated construction process and unloading monitoring of space steel grid cassettle structure multi-storey large-span gymnasium

Abstract

The gymnasium of Fule International School in Mianyang, Sichuan are multi-storey large-span buildings with a maximum span of 36 m and use a new system-steel grid cassettle structure. In this paper, the structure form, prefabricated construction method and support unloading process of the gymnasium are introduced in detail. To ensure smooth construction unloading, the deflection deformation of the large span floor and the field splicing node are monitored. Results show that the prefabricated construction method of the Mianyang Fule International School Gymnasium and the steel column-scaffold combination support system are affordable. After unloading, the floor has the traits of plates and relatively greater rigid reserve. Thus, it is applicable for large-span and high-load floor structure. The stress in the splicing node in the inflection point (L/2, L is the size of the grid) is relatively small, the bolt and the shearing-resistance plate have no slump, and the field splicing node is safe and reliable. The findings provide a certain reference value for the research and innovation in the process of assembly construction of multi-storey and large-span building.