This project is a steel roof truss project of 4 * 135MW main power house of xxxx power plant. The roof truss span is 36m, with 25 trusses in total, 122 pairs of horizontal supports, 71 pairs of tie rods, 546 H-shaped steel purlins, the total weight of the roof truss is 572t, the weight of a single roof truss is 11.25t, the installation height is 22.8m, the roof truss spacing is 8M, and it is divided into 25 axes, including 5~2/5 axes, 1