Tunnel buffering energy absorber and preparation method thereof

The invention belongs to the technical field of tunnel construction, and particularly relates to a tunnel buffering energy absorber and a preparation method thereof.The tunnel buffering energy absorber comprises a hollow buffering pipe, plugs are installed at the two ends of the hollow buffering pipe, the hollow buffering pipe is filled with foam concrete, and an elastic ring is fixed to the side, close to the plugs, of the inner wall of the hollow buffering pipe; a plurality of guide rods are fixed to the sides, away from the center of the hollow buffer pipe, of the elastic rings, and rubber rings are slidably connected to the ends, away from the elastic rings, of the guide rods; the elastic ring is extruded to move when foam concrete is poured into the hollow buffer pipe, so that the rubber ring is pushed to extend outwards, the rubber ring and the inner wall of the plug are attached more tightly, the sealing effect between the rubber ring and the plug can be effectively improved, the buffer energy absorber