Comprising upper & lower chord member, montant and raker welded. One end of the upper & lower chord member is female, and the other end is male, both with pin hole. While splicing the trusses, insert the male end of one truss into the female end of the other, aiming the pin hole and inserting the pin. Holes’ function of truss: chord member bolt hole is used for splicing dual deck or reinforced bridge, by inserting the truss bolt or chord member bolt into the chord member bolt