| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent deformation of side walls of a simply structured tubular beam using a little material. SOLUTION: Each side wall 9 of the tubular beams 3 neighboring on the surface of a pallet 5 is connected with more than one line of beam connecting crosspieces 6. On the surface 1 of the beams 3, more than one line of diagonal crosspieces 7 inclining in plane view relative to the cross pieces 6 are provided. One end of the crosspieces 7 is connected to one side wall 9 of the beams 3 where the end of the crosspieces 6 is connected, and the other end of the crosspieces 7 is connected to the other side wall 9 to which the end of other crosspieces 6 is connected and which adjoins one side wall 9 of the beams 3 at right angles. The crosspieces 7 are connected with one another roughly in the middle with a connection reinforcement cross piece 8.
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