DE1759909B2 - Resin pipe for watering or soaking soil - Google Patents

Description

The invention relates to a pipe for irrigation © the impregnation of soils according to the preamble of claim I.

For the ground irrigation devices are known in the most varied of designs, for example sprinklers, the water in the form of a jet Apply the mist to the area to be watered. There are other designs that are suitable for both drainage and irrigation • from a pipe which is at least partially permeable to water, either because of its special training or retrofitted openings.

For example, a hose made of an expandable foam plastic is known (US Pat. No. 2,807,505), the wall of which has nothing but interconnected, irregularly shaped pores. The water SS is supplied under increased pressure and exits through the porous outer wall. The disadvantage, however, is that the pipe wall has to be strong enough to be resistant enough because of the increased internal pressure, and that the internal pressure must be as constant as possible in order to achieve a uniform water outlet, which is practically impossible with hose lengths of 50 m and more so that at the feed end more water through the porous tube wall outward never occurs even irrigation can be achieved in this way than at entgegengesetz- <> $ th hose end and.

The purpose of the invention is to create a rohrför

moderate grain of the type described above, the wall of which is mechanically so resistant that the wall thickness can be reduced significantly in relation to the water pressure, and there is a considerably lower pressure drop along the pipe, so that even with pipes over 150 m in length a uniform discharge of water along the entire line can be achieved

For this purpose, such a pipe is characterized according to the invention by features as listed in the characterizing part of claim 1.

Advantageous embodiments and an expedient manufacturing method result from the sub address.

In the drawings, for example, Ausfunrungv Forms of the invention shown and below he purifies it shows

F i g. 1 a scheme of the production ^ ..., ahrens, F i g. 2 a tube in perspective view, F i g. 3 shows a cross section of the pipe, Fig. 4 shows a cross section of the water-bearing R (I:

res and

Fig. 5 and 6 two possible arrangements dvr Cuts or punctures.

The production of the irrigation or drainage pipe according to the invention takes place in three or four processes rensstufen, namely stage Ir the mixture of the starting material, stage 2: the drawing of the pipe, stage; the expansion and the formation of the surface skin by quenching; and stage 4: the making of incisions or punctures in this surface skin.

The pipe production from a thermoplastic 1 expandable synthetic resin takes place in a conventional extrusion the, wherein a hollow body 5 is formed, the wall 6 consists of foamed plastic and white rather has a cavity 7 inside for the passage of water. This processing of the plastic mass is usually carried out in the heat at a temperature between 150 and 200 ° through an annular nozzle, which can have any shape, but is generally circular.

As soon as the processing of the plastic compound is finished in this way, the pipes, if necessary after renewed heating, quenched in a suitable cooling device, the outer surface of the pipe being smoothed and consequently the outermost surface Cells are closed so that a surface skin 8 is formed which is essentially impermeable to water. During this treatment it is expedient to introduce air into the inside of the pipe, making the plastic pipe to be processed in close proximity Contact with the molding and cooling equipment remains. In this way, the pipe is given its final shape the intended dimensions, with its outer surface being more or less smooth Air during this process also promotes the connection between the small cells.

After this treatment, the tube is then finally cooled by pulling it through a water bath will.

The relatively impermeable outer skin is then provided with incisions or punctures 9, for which purpose a device with a corresponding one Number of suitable tools can be used. These tools are adjustable in their depth of penetration, so that you can get a depth of the incisions or Punctures up to 50% of the wall thickness can be precisely adjusted.

I 759 909

When manufactured in the manner mentioned above using a cooling device for Quenching the outer surface of about 10 cm in length can be a pipe with a diameter of 25 mm and a wall thickness of 4.5 to 5 mm. By Cutting into such a pipe along four equally spaced surface lines is obtained a water emission over a length of 150 m at a water pressure of 0.7 atm of 772 liters, at 1.05 atm of 335 liters, at 1.4 of 415 liters, at 2.1 atm of 556 liters, at 2.8 atm of 704 liters, at 3.5 atm of 885 liters and at 4.2 atm of 1146 liters.

The irrigation pipe made of plastic, designed and manufactured in the manner according to the invention, offers numerous advantages, e.g. B .:

Due to its low permeability, the water leakage is evenly distributed along the entire length of the pipe, even if this is very is considerable; by attaching the mentioned

Punctures or cuts, the permeability of the pipes can be precisely determined using such a method is very easy and safe; the tube has sufficient rigidity to withstand fairly damage to be resilient even when buried in the ground; on the other hand, the pipe is too sufficiently soft to be handled without difficulty; it is relatively minor Production costs can be produced; it allows the production of permanent and permanent irrigation systems in a simple manner, which do not require constant monitoring and maintenance.

Further substances can be added to the starting mixture for the production of the pipe according to the invention be e.g. B. dyes, fungicides, fillers, etc.

Since irrigation pipes can also be used as drainage pipes, the pipe according to the invention is also suitable for soil drainage.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1.Pipe for the irrigation or impregnation of soils, the pipe wall of which consists of expandable foam S plastics, characterized by the formation of the outer surface of the pipe wall (6) as an essentially impermeable skin (8) in which openings (9 ) are arranged. \O 2. Pipe according to Claim 1, characterized in that the openings (9) are designed as incisions or punctures and also extend into a TcU extend into the pipe wall. 3. Pipe according to claim 1 or 2, characterized by the arrangement of the openings (9) along straight surface lines or helically extending lines. 4. A method for producing a pipe according to claims 1 to 3 by extruding a Hose made of a thermoplastic, expandable synthetic resin in the heat, characterized in that the outside of the wall of this tube shortly after its extrusion to form a non-porous, waterproof outer skin is cooled and this impermeable skin is then cooled up pierced or cut into a depth sufficient to abolish the impermeability will. 5. Process for the production of a pipe according to jo Claim 4, characterized in that the starting mixture used for pipe production Colorings, fungicides, fillers, etc., added will. 35