| 摘要 |
<p>PCT No. PCT/AU87/00190 Sec. 371 Date Mar. 3, 1988 Sec. 102(e) Date Mar. 3, 1988 PCT Filed Jun. 30, 1987 PCT Pub. No. WO88/00129 PCT Pub. Date Jan. 14, 1988.The method of reinforcing a structure formed by interengaging the edges of ribbed strip (1) formed of a plastics material to form a helically wound tube, the strip (1) comprising a plurality of the ribs (2) spaced apart and upstanding from a base (24), characterized by engaging on the strip (1) a non-planar reinforcing member (10), and locking the reinforcing member (10) to the strip to form an attached strength member to attain lateral stability of the ribs.</p> |
