Single-guide-beam downlink type bridge feeding device and bridge feeding method thereof

The invention discloses a single-guide-beam downlink type bridge feeding device and a bridge feeding method thereof. A soft cable is wound through a tractor, and then a carrying trolley is pulled to move, so a prefabricated bridge does not need to be moved through a downlink type hoisting method, the abrasion breakage risk of a steel wire rope in the hoisting process is avoided, and meanwhile theturnover risk caused by the instability of the gravity center in the downlink type hoisting process is greatly reduced; butt joint oil cylinders and butt joint blocks are arranged, the butt joint oilcylinders are fixedly connected with an auxiliary support through bolts, the butt joint oil cylinders drive butt joint rods to move out, and clamping heads are driven by the butt joint rods to move into the butt joint blocks, so butt join mechanisms make a driven trolley in butt joint with a main beam, and the butt joint of bridge feeding rails is accurate and effective; the butt joint mechanismsare simple in structure and efficient in butt joint; and under the driving of a first winch and a second winch, the prefabricated bridge is hoisted to a to-be-erected position through the steel wire rope, no bridge feeding section needs to be added in the downward hoisting process of the prefabricated bridge, and the erecting process is more stable.