| 摘要 |
A flexible sheet (1) for use as a support in the construction of a cavity floor has a plurality of legs (2) therein. Each leg (2) has a plurality of sections, comprising a bottom section (3), one or more intermediate sections (4, 5, 6) and a top section (7) each of which is polygonal in horizontal cross-section and has planar lateral faces (8-16). The lateral faces (8) of the bottom section (3) of the leg (2) flare upwardly at an angle of less than 60 DEG to the horizontal, and the lateral faces (9-16) of each of the remaining sections (4-7) flare upwardly in such a manner that the angle between the lateral faces (9-16) and the horizontal decreases progressively from the section (4) adjacent the bottom section to the top section (7) of the leg (2). <IMAGE>
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