The main longitudinal power rods of the upper beam are located on both sides of the beam, and the internal support power rods are located at the top and bottom of the beam. The fixing and overlap length of the longitudinal bars are in accordance with the specification; the stirrups in the beam are closed and made with hooks at an angle of 135 degrees. The length of the straight section of the end of the hook should not be less than 10 times the diameter of the stirrups, and the maximum value is 75 m.