Tensioning and forming method and tensioning device of spoke type annular cantilever cable support grid structure

The invention relates to a tensioning and forming method and a tensioning device of a spoke type annular cantilever cable support grid structure. The spoke type annular cantilever cable support grid structure comprises an annular main body structure, a grid structure and a cable rod structure, wherein the grid structure and the cable rod structure are connected with the upper part of the main body structure, and the cable rod structure is positioned under the grid structure and comprises an annular guy cable and a radial guy cable. The method is characterized in that after the main body structure and the grid structure are constructed and the radial guy cable and the annular guy cable are lifted and installed, the radial guy cable tensioning construction is performed, and three types of tensioning devices are designed according aiming at the radial guy cables different in sizes during the tensioning construction. The deviation between the actual value of the stress of the tensioned and formed radial guy cable