Fabricated bridge safety channel and construction method

The invention discloses an assembly type bridge safety channel and a construction method, the assembly type bridge safety channel comprises shear fork rods, the middles and the ends of the shear fork rods are rotationally connected through pin shafts, mounting blocks are rotationally mounted at the upper ends and the lower ends of the shear fork rods through rotating shafts, and stand columns are inserted into the mounting blocks from top to bottom. An upper limiting plate is fixedly connected to the position, close to the upper end, of the stand column, the upper limiting plate is located on the lower surface of the upper cover mounting plate, a lower limiting plate is fixedly connected to the upper portion of the stand column, and the lower limiting plate is located at the upper end of the upper mounting block. The middles and the ends of the shear fork rods are rotationally connected through the pin shafts, the angles of the shear fork rods can be adjusted, opening and closing of the shear fork rods are ac