Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent
1995-12-07
1997-11-18
Graysay, Tamara L.
Hydraulic and earth engineering
Drainage or irrigation
Porous or apertured pipe, flume, or tileway
405 43, 405 36, 405 50, 521695, E02B 1100
Patent
active
056880731
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage application of international application number PCT/CA94/00281 filed May 18, 1994, now abandoned.
The present invention relates to earth drains for the drainage of soil having low water permeability such, for example, as clay.
More specifically, the type of earth drain to which this invention relates consists of a core comprising a relatively flat, flexible, elongated web having surface projections, usually on both sides thereof, which core is encased in a filter of water permeable sheet-like material. The projections on the web surfaces of the core serve to maintain the filter in spaced relationship with the web. Such drains are usually driven vertically into the ground to a substantial depth. In use, water passes through the free surface area of the filter i.e., that area of the filter which is not in contact with the web projections, and drains away through the space between the web surface and the encasing filter material. Drains of this type are illustrated in Oleg Wager Canadian patent No. 930,999 dated Jul. 31, 1973, and Oleg Wager Canadian patent No. 1,015,173 dated Aug. 9, 1977.
The drain described in Canadian patent No. 1,015,173 constituted an improvement of the drain described in the earlier Canadian patent No. 930,999. The drain disclosed herein constitutes an improvement on the drain described in Canadian patent No. 1,015,173, in that the drain of the present invention can be produced much more economically as a result of substantial savings in raw material costs and improved production efficiency while maintaining the satisfactory performance of the earlier drain.
In a broad aspect, the earth drain according to the present invention comprises a core consisting of an elongated flexible web having on at least one surface thereof, and preferably on both surfaces, an array of discreet projections spaced transversely across the width of the web, and longitudinally in the lengthwise orientation of the web. The array of projections is interrupted by a plurality of elongated projection free zones extending in the longitudinal direction of the web, and spaced transversely across the width of the web. A filter of sheet-like water permeable material encases the core, and is adapted to be maintained in spaced relationship to the web by the free ends of the projections thereon.
The web is typically of uniform width and indeterminate length, and the projections are preferably of uniform length or height (as measured from the surface of the web) and of uniform shape. Typically, the projections will be of frusto-conical shape. However, the projections can be of cylindrical configuration or may have a circular, square, hexagonal, or other cross-section.
Preferably, the projection free zones will have a transverse width equal to or greater than twice the transverse spacing of adjacent longitudinal rows of projections. The projection free zone will be separated by at least two longitudinal rows of projections. Projections in adjacent rows, when viewed in either the longitudinal or transverse direction of the web will preferably be staggered by one half the spacing between adjacent projections to reduce the distance between unsupported areas of the filter in the projection covered areas of the web.
While the elongated projection free zones of the web may extend throughout the length of the web, preferably such zones will be interrupted at regular intervals in the longitudinal direction of the web by bands of transverse rows of projections which extend, with or without interruption, completely across the width of the web. The purpose of these transverse bands is to provide for a cross-flow of water flowing through the drain in the event of transverse blockage of the drain in those projection free zones in which the filter is unsupported by the tops of project ions.
The elongated projection free zones may be longitudinally aligned throughout the length of the web. Alternatively, the transverse spacing of the elongated projection free zones on opposite sides of each transverse
REFERENCES:
patent: 3888087 (1975-06-01), Bergsland
patent: 4622138 (1986-11-01), Wager
patent: 4733989 (1988-03-01), Harriett
patent: 4840515 (1989-06-01), Freese
patent: 4925342 (1990-05-01), Hendy
patent: 4943185 (1990-07-01), McGuckin et al.
patent: 4956951 (1990-09-01), Kannakeril
patent: 5383314 (1995-01-01), Rothberg
(PCT Int'l Pub. No. WO,A 83/02790 (Gemmell).
(PCT Int'l Pub. No. WO,A 82/03099 (Bergsland).
Brodeur Joseph Clement
Siemonsen Mark E.
Von Stedingk Vicko M.
Graysay Tamara L.
Lagman Frederick
LandOfFree
Earth drains does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Earth drains, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Earth drains will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1561030