E - Fixed Constructions – 02 – B
Patent
E - Fixed Constructions
02
B
61/32
E02B 11/00 (2006.01) E02D 3/10 (2006.01)
Patent
CA 1170848
ABSTRACT OF THE DISCLOSURE A plastic underdrainage tube of generally reticular configuration formed by extruded plastic material is disclosed. The tube is comprised axially spaced relatively thick annular bands to reinforce or impart to the tube a high stability against surrounding pressures, and circumferentially disposed longitudinal strands in thicknesses less than those of said annular bands. These longitudinal strands are closely spaced along the circumference of the tube to form drainage openings between the circumferentially adjacent strands, the openings being disposed across the entire periphery and length- wise of the tube to allow water inflow over the entire wall portion thereof. Each of said strands is blended into or in- tegrally joined at its intersections to the annular bands so as to be mechanically supported by said annular bands of reinforcing members, thus improving the overall strength of the tube to withstand the surrounding pressure while requiring the amount of plastic material to be used at a low level. In another embodiment, longitudinal strands are formed in sinuously corrugated configuration and blend at their valley portions into the annular bands to define the drainage openings between the ridge portions of the adjacent strands. The external forces acting on the ridge portions can be spread or decentralized by the corrugation of the strands and supported by the adjacent annular bands of reinforcing member.
412438
Matsuyama Shinzo
Miki Shinji
Nishio Toyokazu
Yamazaki Shinichi
Marks & Clerk
Takiron Co. Ltd.
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