Improve node extraction resistant performance's device

The utility model relates to an improve node extraction resistant performance's device, the device are applied to large -span roof structure and support, the steel column, spherical hinge support andthe welded ball that connect gradually including from the bottom up, roof structure passes through welded ball with spherical hinge support and is connected, roof structure passes through the spherical hinge support supporting on the steel column of lower part, welded ball sets up the resistance to plucking reinforcing pull rod all around with the steel column, and the upper end of resistance to plucking reinforcing pull rod is connected with welded ball through connecting the otic placode, and on the box bracket, the resistance to plucking reinforcing pull rod adopts lower extreme stretch -draw mode to set up prestressing force to the side of support steel column in the lower extreme anchor of resistance to plucking reinforcing pull rod. The utility model discloses a set up the resistanceto plucking reinforcing p