Bidirectional fastening type expansion screw for concrete road lap joint

The utility model discloses a concrete road lap joint two-way fastening type expansion screw which comprises an expansion pipe and a bolt arranged in the expansion pipe, cracks are formed in the two ends of the expansion pipe, the end of the expansion pipe is divided into a plurality of turning-up parts through the cracks, a bolt cap is arranged at one end of the bolt, and a bolt nut is arranged at the other end of the bolt. According to the expansion bolt, the turnup parts at the two ends are propped open and abut against the side wall of the installation hole through the bolt cap and the movable sleeve, the expansion bolt is effectively prevented from falling off, and when the turnup parts are propped open, the expansion bolt is not prone to falling off, so that the expansion bolt is not prone to falling off, and the service life of the expansion bolt is prolonged. The outer side conical protruding part is pushed to be inserted into the side wall, the expansion screw is further prevented from loosening, and