| 摘要 |
A combined formwork and cavity tray element for use in the construction industry having first and second web portions joined together by a third web portion forming an included angle of more than 90 DEG with each of the first and second web portions. The first web portion is substantially straight throughout its longitudinal direction and the second web portion is curved in the vertical direction towards the plane containing the uppermost elongate flat surface of the first web portion. If desired, the element may include a box-section wherein the second web portion comprises the top wall thereof.
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