1, which can reduce the size of beam-column section and the corresponding foundation;

2. As a large double slope roof, it creates conditions for long slope drainage;

3, longitudinal rigid members can be omitted to reduce the flange width;

4, the installation is convenient and quick, and the civil engineering quantity is less; 6. With a high degree of industrialization, the component units can be divided according to the transportation conditions, and the units can be connected by bolts at the site.