Patent ID: 8353134

Claim:
An grouted tubular energy-dissipation unit, comprising: an inner tube and an outer tube, wherein the inner tube is coaxially inserted into the outer tube defining a gap within a lapping portion between the inner tube and the outer tube, wherein an expansive cement grout is provided in the gap, and the expansive cement grout after solidified forms an expansive ring; a connecting flange A is fixed on the out end of the outer tube and a connecting flange B is fixed on the out end of the inner tube, the relative slide between the inner tube and the outer tube dissipates and absorb energy during earthquake; a shear key is provided on an inner surface of the outer tube within the lapping portion, the shear key is weld dot, weld line, truncated steel bar or stud that welded on an inner surface of lapping portion of the outer tube and in the expansive ring.