Support pipe

The utility model relates to the related technical field of support pipes, in particular to a support pipe which comprises a reaction upper clamping ring, a lower clamping ring is rotatably connected to the lower surface of the upper clamping ring, an adjusting mechanism is arranged on the lower surface of the lower clamping ring, and a clamping mechanism is arranged on the outer side surface of the upper clamping ring. According to the support pipe, through arrangement of the threaded rod, the nut, the bottom rod, a first threaded hole, a first clamping groove, a gasket and a second threaded hole, when the support pipe is used, the bottom rod is connected with an external bolt through the second threaded hole, an upper clamping ring is rotated again, the upper clamping ring drives a lower clamping ring, and the lower clamping ring drives the threaded rod to rotate; the threaded rod is aligned into the first threaded hole formed in the bottom rod, due to the fact that the upper clamping ring and the lower cla