The utility model relates to a can change pier of assembling fast and prevent that car hits modular structure. Present bridge pier structure is various, and it is complicated, higher to strong, the installation difficulty of the adaptability of pier, construction cost to prevent that the car hits the device structure. The utility model discloses assemble the setting around the pier periphery, including the casing, the inside packing of casing has the power consumption filler, a side of casing is provided with the self -resuming elastic layer, the upper and lower two sides of casing is provided with boss and lower boss respectively. The utility model discloses in, the power consumption is filled and evenly is full of whole shell cavity, plays power -wasting effect, the self -resuming elastic layer is pasted in the outside of casing, plays the function that resets by oneself, after the self -resuming elastic layer was pasted in the casing outside, one deck anticorrosion protective layer was applied paint with a brush to exposed casing and self -resuming elastic layer, plays anticorrosive, ageing -resistant effect, the part modularized design, strong adaptability, easily batch production, installation and maintenance change are with low costs.