| 摘要 |
Structured, as is conventional, on the basis of a lower substrate of beams 1 which rest on shores 2 and an upper substrate of beams 3, perpendicular to the previous ones and on which the planks of wood forming the actual shuttering surface have to rest, they are obtained from steel sheet of high strength and reduced wall thickness and in them are formed upper channels 4-11 for coupling to the conventional wooden battens 5 which allow fastening by nailing between the elements of the shuttering, the beams of the upper substrate also having holes 14 and 15 for lightening the material and reducing the weight of the beams, some of which have inner edges or flanges 15 acting as stiffening means. In addition, the beams of the upper substrate have, at the level of their base, lateral and horizontal fins 13 which allow nailing of these beams to those of the lower substrate. <IMAGE>
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