Pressure detection device for bottom of bridge

The utility model provides a pressure detection device for the bottom of a bridge. A bridge detector belongs to the technical field of bridges and comprises a piston cylinder, a clamping bolt and a detection cylinder, the clamping bolt is welded to the left side of the piston cylinder, the detection cylinder is arranged on the right side of the piston cylinder, a spring is welded to the bottom ofthe inner wall of the piston cylinder, and a piston plate seamlessly slides on the inner wall of the piston cylinder with the bottom welded to the spring. According to the utility model, the pressingplate abuts against the bottom of the bridge; the clamping bolt is fixed on a support of a bridge; vehicle passing a bridge, vibration generated by bridge, the pressing plate is pressed down by the bridge; the pressing plate drives the supporting rod and the piston plate to move downwards in the piston cylinder, water in the piston cylinder is extruded on the pressure sensor through the molten steel pipe, the pressure sens