Drainage and strap drain materials

Details Drainage and strap drain materials Drainage and strap drain materials

1999-12-06

2001-06-19

Bagnell, David (Department: 3673)

Hydraulic and earth engineering

Drainage or irrigation

Porous or apertured pipe, flume, or tileway

C405S045000, C405S036000, C052S169500, C052S169140

Reexamination Certificate

active

06247874

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to drainage and, in particular, to improvements in the drainage method and the strap drain materials therefor.
The inventor discloses in the U.S. Pat. No. 5,934,828 a drainage method and strap drain materials adapted for use in the soil conservation on mountain slopes, the underground drainage on orchards and farms, and the drainage system in tunnels, road bases and building basements. This is brought about at the openings of drain channels of the materials by means of capillary action to absorb in water from the soil, by the difference in elevation between the two ends inside the channels of enlarged area and the partial siphoning force so produced thereby promoting water absorption and collection for discharge. Samples of such materials on testing have now been found to contain the following problems, which need to be improved:
(1) because the drain materials are of a sheet like strap type, the hollow portion in section occupies a considerable area, which more often exceeds that of the solid portion. On production, due to small resistance to pulling, the materials sometimes break on pulling or the channels are deformed and are therefore not suitable for high speed long measure continuous production. On use, because of relatively small strength of the pull resisting structure, the entire strap is easily pulled crack.
(2) It is very difficult when the drain materials have to be connected laterally. Also, by means of connecting it is inconvenient and unreliable by means of connecting members affecting the construction works. Furthermore, when embedded in soil it also produces relative slip easily because of the small frictional ground gripping force of the soil.
SUMMARY OF THE INVENTION
Because of the foregoing shortcomings, the inventor continued to improve and have thereby accomplished in the completion of the invention. Accordingly, it is an object of the present invention to provide a strap drain material having an even larger tensile strength and ground gripping force as well as excellent operativeness in side by side connection.
Another object of the invention is to provide a strap drain material capable of being vertically deeply embedded or buried in hillside where no trees are planted or where after trees are felled there is no water conserving action by trees and, by means of its excellent ability to absorb and direct water, capable of conducting rainwater rapid-and-effectively deep into the soil whereby washing down of a large amount of rainwater is prevented.
A further object of the invention is to provide a strap drain material having a high tensile strength to be suitable for continuous mass production.
In order to accomplish the above purposes, a strap drain material of the present invention is provided where inside the strap body on one side of the strap body having drainage channels, there is embedded a plurality of parallel, side-by-side arranged filaments or synthetic fiber filaments or tensile reinforcements formed by horizontal and vertical interleaving or interlocking of the filaments into a net form and formed integrally with the strap body. Next, on the side of the strap body where there are no drainage channels, depending on the necessity a plurality of straight or curve line cross ribs or continuously curved line ribs may be formed integrally with the strap body to increase the frictional force (earth gripping force) in relation to the soil and may also act to enhance the strength of the strap body. Furthermore, on the two lateral sides of the strap body are formed with lap joint parts to provide for the adjoining drain materials to lap over each other.


REFERENCES:
patent: 5056281 (1991-10-01), McCarthy
patent: 5369926 (1994-12-01), Borland
patent: 5511346 (1996-04-01), Kenworthy
patent: 5704172 (1998-01-01), Gougeon et al.
patent: 5934828 (1999-08-01), Hu et al.

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