Mountainous area bridge water curtain debris flow anti-collision device and method

The invention discloses a mountainous area bridge water curtain debris flow anti-collision device and method, which can deflect the movement direction of debris flow, prevent the debris flow from directly impacting and damaging a bridge abutment, and ensure the structural safety of the bridge abutment. The device comprises bridge abutments, an anti-collision pier is vertically arranged on the upstream side of the bridge abutments, the cross section of the anti-collision pier is in an isosceles triangle shape, the bottom edge of the isosceles triangle is parallel to a bridge, the vertex angle of the isosceles triangle is opposite to the bridge, and water curtain spray heads are arranged on the vertex angle edge and the two side faces of the anti-collision pier. After debris flow outbreaks,the mud position is gradually increased to the water curtain starting mud position, a mud position sensor transmits mud position information to an intelligent starting and stopping device, the intelligent starting and stoppin