| 摘要 |
Lattice truss comprising: two upper beams (20, 53) and two lower beams (20, 53); an upper horizontal frame (21, 50) fixed to said two upper beams (20, 53); a lower horizontal frame (22, 50) fixed to said two lower beams (20, 53); two side frames (23) respectively connected to one of said two upper beams (20) and to one of said two lower beams (20); characterized in that said upper horizontal frame (21, 50) and, said lower horizontal frame (22, 50) are connected together by way of truss segments (24, 26, 35, 37, 52, 54) connected together in a Y shape with angles equal to one-third of the round angle. |
