| 摘要 |
<p>An hollow formwork for a insitu reinforcing concrete structure such as a concrete floor is disclosed, which comprises an hollow tube (1) having a circular, square, trapezoid or other profile shape in section. A transversely stiffening rib (2) is fixed to the inside of the hollw tube (1) in a direction perpendicular to the axis thereof so as to form a double-directions hollow tube member. A reinforcing bar (7) is formed on the two sides of the transversely stiffening rib (2) which may be extend beyond the hollow tube (1). The reinforcing bar (7) is extend outside the tube (1) to form an reinforcing bar (8).</p> |
