Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent
1980-07-25
1983-06-21
Taylor, Dennis L.
Hydraulic and earth engineering
Drainage or irrigation
Porous or apertured pipe, flume, or tileway
405 36, 405 48, 138111, 138177, E02B 1300
Patent
active
043891381
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
At buildings and at many other occasions it is desirable and necessary to drain off rainwater, in order to prevent damages and settlings by moisture. A problem heretofore unsolved in conventional drain pipes is, that the pipes after some time of use almost always clog with mud and must be dug out for exchange or cleaning, which involves large expenses. The problem arises in the earthenware pipes known since long ago as well as in the plastic pipes, which are provided with holes or slits and applied to an increasing extent though the plastic pipes are of such doubtful reliability, that they are banned by some local authorities.
The present invention, therefore, has the object to produce a drain pipe, which ensures efficient draining for a very long time without getting clogged by mud, and which at the same time is easy to manufacture and mount.
For achieving this object, the pipe according to the invention comprises an outer pipe, which is slitted on its lower surface. From the edges on both sides of the slit longitudinal walls are fixed. Holes or openings provided at the upper edges of the walls establish connection between the space located between the walls and the two spaces between the walls and the pipe proper. Drain water arising through the slit in the pipe between the inner walls can through this structure flow over into the two lateral channels of the drain pipe. The likelihood of clogging by mud is hereby reduced substantially, because, firstly, the water always must move upward before entering into the drain pipe. Since the mud suspended in the water is somewhat heavier than the water, the water is cleaned while arising between the walls. Secondly, the water cleaning effect is amplified by the very large drain surface, which the drain pipe provides in the form of the intermediate space between the walls, and which results in a low speed of water inflow into the drain pipe.
When the water has entered into the two drain channels on both sides of the partition walls, the drain water flows at a good speed, due to the relatively moderate flow cross-section. Said good speed ensures that mud possibly following along in these channels rapidly is transported away. This effect is improved additionally at a further development of the invention subject matter, according to which the holes or openings from the riser space for the drain water between the partition walls and into the two drain-off channels are located at different heights, so that at moderate water supply all this water is removed through the drain-off channel on one side. When this level has been exceeded, also the other channel is taken into use. Due to the generally moderate amounts of drain water, almost always only the drain-off channel, in which the openings are located at a low level, will be utilized. When this channel, for example due to unfavourable external conditions, gradually is clogged by mud, the other channel remains to be used, and the life of the drain pipe, thus, is extended substantially. In order to facilitate the manufacture of the invention subject matter, the two partition walls drawn up from the slit at the bottom of the pipe preferably are interconnected at their upper edges and/or are connected to the inner wall of the pipe with an inclined roof extending inward to each other, so that in these parts of the walls holes can be drilled or openings can be milled easily by a drill or milling cutter respectively inserted through the slit. It is hereby possible to manufacture the drain pipe by extrusion and subsequent milling operation, and the pipe, in spite of its qualified function, is not more complicated to manufacture than other known plastic drain pipes. Due to the connection of the partition walls with the inside of the pipe, besides, the resistance of the pipe in the normally vertical strain direction is increased.
In order to prevent the drain pipe from being compressed at the lower surface by the soil pressure, preferably supports for the pipe are provided, which supports
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