FI77076C - DRAENERINGSROER AV PLAST OCH DESS TILLVERKNING. - Google Patents

Description

1 77076

The present invention relates to a plastic drain pipe consisting of transversely corrugated, superimposed parts which form water inlet channels between them. The invention further relates to methods for manufacturing such plastic drain pipes.

Plastic drainage pipes are commonly used for drainage, which are usually transversely corrugated so-called corrugated pipes. This corrugated shape makes the pipes rigid. Plastic drain pipes have holes for water to enter the pipe. The water inlets of the pipe are normally placed around the pipe at the bottoms of the waves. There may be 4 to 10 rows of holes in the pipe.

In ordinary drainage pipes, the water inlet holes must be dimensioned so small that water enters the pipe but not sand (filter tin). The disadvantage of these drainage pipes is that the water always carries contaminants as well as rust, which accumulates in the walls of the holes, whereby the holes quickly grow closed and prevent water from entering the pipe. The water inlet holes should therefore be so large and so numerous that the holes remain open for as long as possible and the cleaning intervals of the pipe are as long as possible.

Drainage pipes usually lie in a ditch on a sand bed. Sand acts as a filter medium. If there are large holes in the secret pipe, it must therefore be prevented that sand cannot penetrate through the holes in the pipes and that the holes are not blocked by the sand.

EP-A-0 115 477 discloses a plastic drainage pipe of the type mentioned at the beginning of this description, consisting of a complete, transverse corrugated inner pipe, 2 77076 with water inlet holes at the top, and a transverse corrugated outer pipe arranged thereon. This outer tube is made of a transversely corrugated tube having a diameter equal to the diameter of the inner tube by cutting off about 1/3 of its circumference and then forcing this outer tube onto the inner tube. These tubes are permanently connected to each other, e.g. by welding, and in such a way that the bottom of the outer tube corrugation and the inner tube corrugation ridge are connected, whereby the inner tube corrugation bottom and the outer tube corrugation ridge form a water inlet channel between them.

The disadvantage of this solution disclosed in EP-A-0 115 477 is that two separate pipes are required for the manufacture of the drain pipe described therein, i.e. the inner pipe and the outer pipe, and given that raw material costs make up a significant part of the drain pipe price, this drain pipe does not make much sense. In addition, the water inlet holes are located in the upper part of the inner tube, whereby the water has to rise along the channel between the inner and outer tube and run along the circumference of the inner tube up to its upper part. In this case, contaminants settle on the outer surface of the inner tube, in particular at its top at the water inlet holes, which over time interfere with the operation of the drain pipe and can even lead to clogging of the holes.

The object of the present invention is to provide a plastic drainage pipe in which the above-mentioned drawbacks and disadvantages have been eliminated and in which there are a relatively large number of large water inlets which are effectively prevented from clogging. It is a further object of the invention to provide a method of making such a plastic drain pipe.

These objects can be realized by the present invention, the main features of which appear from the appended claims.

3 77076 In contrast to EP-A-0 115 477, the drain pipe according to the invention is manufactured from one and the same transverse corrugated pipe, so that the drain pipe according to the invention corresponds to a conventional drain pipe in terms of raw material consumption.

According to the invention, the pipe material is arranged in an overlapping manner along the length of the pipe in at least one zone, whereby the overlapping pipe sections form water inlet channels between them.

It is essential for the drain pipe according to the invention that the inlet openings of the water inlet ducts are directed downwards from the installation position part of the pipe. In this case, the water has to travel some distance from the water inlet duct before it can drain into the pipe itself, and as a result the water inlet ducts are effectively protected from clogging and the filter material (sand) surrounding the pipe does not enter the pipe.

According to a preferred embodiment of the invention, the pipe wall material is arranged to overlap so that the bottom of the corrugation of the inner pipe section and the corrugation ridge of the outer pipe section form a water inlet channel between them. It is possible to form separate water inlet holes in this inner pipe section, although this is not necessary to provide sufficient water flow.

The drain pipe according to the invention differs mainly from the known drain pipes in that water does not enter the pipe directly through the water inlet openings (holes), but has to pass along the water inlet channel in order to enter the pipe.

The waveform of the transverse corrugated tube determines the size of the water inlet channels. The size of the channels can be adjusted e.g. racket brush height. The height of the brushes can be e.g.

change only at points where the pipe sections overlap. The channels can be very large because, due to the above-mentioned position of the channels, 4,77076 sand cannot get up into the channels.

The water inlet channels can be on one side of the pipe or also on both sides.

The drain pipe according to the invention is preferably manufactured in such a way that the transverse corrugated pipe is cut open in the longitudinal direction or already at the pipe manufacturing stage a transverse corrugated pipe is formed which remains open along one longitudinal line. Thereafter, and in the same manufacturing step, the loose pipe sections are forced on top of each other and the end from the other side is forced to move simultaneously longitudinally so that the corrugated bottom of the second pipe section meets the corrugation peak of the second pipe section. In this way, a flow channel is formed for the water at each corrugation between the crest of the corrugation of the outer pipe section and the bottom of the corrugation of the inner pipe section. This manufacturing method results in a transverse corrugated drainage pipe in which the water inlet channels are located on the other side of the pipe.

If an even larger number of water inlet channels is desired, the pipe can be made by cutting the transverse corrugated pipe lengthwise into two substantially equal parts, after which these pipe halves are joined together so that the upper half covers the underlying half on both sides and the halves are joined together, that the bottoms of the upper half of the wave apply to the ridges of the lower half of the wave.

The joining of the pipe halves can be carried out, for example, by gluing or welding or in some other manner known per se.

5,77076

At the junction, the ridges of the second half corrugation and the bottoms of the second half corrugation can be shaped so as to obtain the best possible surface contact. It is also possible to provide slip barriers for the pipe halves with different profiles or to form different nozzles on the pipes in order to achieve a locking effect.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a drainage pipe according to the invention seen from its end, Figure 2 shows a perspective view of the structure according to Figure 1 in a perspective view, Figure 3 shows a perspective view of a detail of Figure 2, Figure 4 shows another drainage pipe according to the invention. Fig. 5 shows a perspective view from the right of the structure according to Fig. 4, and Fig. 6 shows a perspective view of a detail of Fig. 5.

Figures 1-3 show a transverse corrugated plastic drain pipe 1, in which the corrugated bottom 4 of the inner pipe part 10 and the corrugated ridge 5 of the outer pipe part 9 form a water inlet channel Θ. The corrugated ridge 6 of the inner pipe section 10 is connected to the corrugated bottom 7 of the outer pipe section 9. The length of the water inlet duct 8 depends on how much the lower inner pipe section 10 and the upper outer pipe section 9 overlap.

The corrugated bottom 4 of the inner pipe section 10 has water inlet holes 15 located in two rows along the length of the pipe.

When the drain pipe 1 is placed in the ditch, water penetrates through the lower ends of the water inlet ducts into the water inlet duct 8 and exits the water inlet ducts through the water inlet holes 15 and outlets 16 into the drain pipe itself.

Figures 4-6 show a transverse corrugated plastic drain pipe formed of two pipe halves 2 and 3. The end portions 11 and 13 of the upper pipe half 2 are arranged on the end portions 12 and 14 of the lower pipe half 3, the corrugated bottoms 11 and outer tubes of the inner pipe sections 12 and 14 and 13 the corrugated ridges 5 form water inlet channels 8 on both the right and left sides of the tube. The corrugated ridges 6 of the inner pipe sections 12 and 14 are connected to the corrugated bottoms 7 of the outer pipe sections 11 and 13. The length of the water inlet channel Θ depends on how much the upper pipe side 2 and the lower pipe half 3 are connected to each other.

The corrugated bottoms 4 of the inner pipe sections 12 and 14 have water inlet holes 15 located in two rows along the length of the pipe on both sides of the pipe.

Once the drain pipe is placed in the ditch, water penetrates through the lower ends of the water drain channels into the water inlet channel 8 and exits the water inlet channels through the water inlet holes 15 and the outlet openings 16 into the drain pipe itself.

Claims (9)

A plastic downcomer consisting of transversely corrugated superimposed portions <9, 10; 11, 12; 13, 14) forming water inlet channels (8) between them, characterized in that said parts originate from one and the same transverse corrugated pipe and in that the pipe has at least one zone along the length of the pipe with overlapping pipe sections (9, 10; 11, 12; 13, 14), which form water inlet channels <8) between them, the inlet openings of which are directed downwards in the installation position of the pipe and the outlet openings (16) of which open inside the pipe. A downcomer according to claim 1, characterized in that the pipe sections <9, 10; 11, 12; 13, 14) are overlapped so that the corrugated bottom (4) of the inner pipe part (10, 12, 14) and the corrugated ridge (5) of the outer pipe part (9, 11, 13) form a water inlet channel (8) between them. Sewer pipe according to Claim 1 or 2, characterized in that the inner pipe section (10, 12, 14) also has water inlet holes (15). Sewer pipe according to one of Claims 1 to 3, characterized in that the water inlet channels (8) are located in one longitudinal zone on the other side of the pipe. Drainage pipe according to one of Claims 1 to 3, characterized in that the water inlet ducts (8) are located in two longitudinal zones of the pipe, which are located substantially diametrically on both sides of the pipe. Method for manufacturing a drainage pipe according to one of Claims 1 to 4, characterized in that a transverse corrugated pipe (1) is formed which is open along one longitudinal line of the pipe, and the loose pipe sections 77076 8 (9, 10) are superimposed and permanently joined, for example by gluing. or by welding to form a transverse corrugated pipe, in which the overlapping pipe sections (9, 10) form water inlet channels (8) between them. Method according to Claim 6, characterized in that the corrugated ridges (6) of the inner pipe section <10) and the corrugated bottoms (7) of the outer pipe section (9) are matched and permanently connected. 7 77076 Method for producing a drainage pipe according to one of Claims 1 to 3 and 5, characterized in that the transverse corrugated pipe is cut open along two longitudinal lines of the pipe to form two pipe sections <2, 3), the second pipe section (2) overlapping the second pipe section (3) on and the overlapping pipe sections (11, 12; 13, 14) are permanently joined together, for example by gluing or welding, to form a transverse corrugated pipe, where the overlapping pipe sections <11, 12; 13, 14) form water inlet channels (8) between them. Method according to Claim 8, characterized in that the corrugated ridges (6) of the lower pipe section <3) and the corrugated bottoms (7) of the upper pipe section (2) are matched and permanently connected.