Broken bridge anchor bolt for adjusting thickness of cavity between insulation board and wall

The utility model provides a broken bridge anchor bolt used for adjusting the thickness of a cavity between a heat preservation plate and a wall body, and relates to the technical field of building outer wall heat preservation equipment. The broken bridge anchor bolt used for adjusting the thickness of the cavity between the heat preservation plate and the wall comprises a core hitting expansion piece, a first threaded rod, a limiting piece, a multi-edge piece and a special-material disc piece. And the striking core expansion piece is connected with a wall body. And the first threaded rod is connected with the striking core expansion piece and can open the striking core expansion piece. The limiting piece is connected with the first threaded rod and can move on the first threaded rod. And the polygonal piece is connected with the limiting piece and the first threaded rod. And the special-material disc piece is connected with the polygonal piece. By the adoption of the technical scheme, in the process of repai