Detachable and reusable expansion bolt

The detachable and reusable expansion bolt comprises an inner screw rod, an expansion pipe, a gasket, a nut and an outer screw rod, one end of the inner screw rod is coaxially connected with a conical pull head, the other end of the inner screw rod is in threaded connection with the outer screw rod, the expansion pipe is sleeved on the inner screw rod, and an axial groove is formed in one end, close to the pull head, of the expansion pipe. The nut is connected to the movable end of the outer screw, and the gasket is located between the expansion pipe and the nut. According to the expansion bolt taking-out device, the effects of complete taking-out and repeated use of the expansion bolt are achieved. 本实用新型提供了一种可拆卸重复使用的膨胀螺栓，包括内螺杆、膨胀管、垫片、螺帽和外螺杆，内螺杆的一端同轴连接圆锥形拉头，另一端螺纹连接外螺杆，膨胀管套装与内螺杆上，且膨胀管靠近拉头的一端开设轴向槽，螺帽连接于外螺杆活动端，垫片位于膨胀管和螺帽之间。本实用新型产生了实现膨胀螺栓的完整取出以及重复使用的效果。