| 摘要 |
A hollow structural element has a hollow member having a circumferential wall and a side wall which closes one of the axial ends of the circumferential wall, a cover member arranged to close the other end of the circumferential wall of the hollow member and connecting elements for connecting the structural element with other structural elements. The connecting elements include an undercut projection provided in the cover member and arranged for inserting into an undercut groove of another structural element, and an undercut lateral slot provided in the side wall of the hollow member and arranged for engaging with an undercut projection of a further structural element. The lateral slot has a first enlarged portion through which the projection of the further structural element can pass, and a second reduced portion extending from the first portion toward the axis of the circumferential wall and dimensioned so that the projection of the further structural element engages in the reduced portion.
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