3) The bridge floor is towed with 5 tons of slow winch as power,6/8 "steel wire rope and outlet (2 six-door hoists to wear the steel wire rope) as traction, 7.5cm seamless steel pipe as pipe, and slowly move to the required position on the road (16×22×250cm). 2, lifting beam in place 1)2 pieces of 40 meters long (?) The structural type and assembly of the load-bearing beam of the A-chord universal member are shown in Figure 7.