| 摘要 |
The object of these improvements is to eliminate the additional elements that are attached to the purlin holders 3' according to said main patent, to make it possible for the lateral quadrangular profiles 5 of the purlins to be flush with the intermediate support beams 10 in the event that plates or long boards 6' should have to be supported, simplifying the whole and reducing its manufacturing cost. For this purpose, the purlins 1a are higher and the abovementioned quadrangular profiles 5 are attached at an intermediate region of their sides, so that said profiles 5 lie flush at the top with the upper face of the intermediate beams 10 at the same time as the purlins 1a bear directly on the purlin holders 3', their lower part being housed between the projections 4 also attached directly to said purlin holders 3'. <IMAGE>
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