Locking type expansion bolt

The utility model provides a locking type expansion bolt. The locking type expansion bolt consists of a bolt, a bolt casing pipe, a nut and a gasket ring, wherein the edge of the back of the bolt head is a stressed ring surface; the interior of the stressed ring surface is transited to the bolt body through a wedge surface or an arc guide surface; the bolt casing pipe comprises a metal expanding pipe and an outer pipe which is in transition fit or interference fit with the metal expanding pipe; a plurality of axial opening grooves are formed in the expanding end of the metal expanding pipe; preferably, the outer pipe is made of plastic or nylon plastic with certain elasticity. According to the technical scheme, due to the fact that a dual-duct fastening structure and a fixing foundation are fixedly matched, the ideal technical effect of fastening and fixation can be achieved when the locking type expansion bolt is matched with various fixing foundations, and the locking type expansion bolt has multiple functi