FI71807B - DRAENERINGSROERANORDNING - Google Patents

Description

Drying tube arrangement 7 1 ft Π 7

Dräneringsröranordning / i O U /

The present invention relates to an arrangement associated with a drying pipe, which pipe is provided with holes for the introduction of water.

In drying pipes, it is common for water inflow holes to become clogged as fine soil entrains with the discharged water into the pipe.

Attempts have been made to solve this clogging problem primarily by means of filtration-based methods, in which case various filter elements are arranged in connection with the drying pipe. One such structure is presented in Finnish, expired patent application no. 2875/65. In this structure, water inflow holes are made in the bottom area of the drying pipe, and a filter element is placed in the interior of the pipe in connection with these inflow holes. The water entering the pipe thus has to pass through the filter element in question. However, the disadvantage of this known arrangement can be considered to be the clogging of the filter element over time by the action of fines entrained in the water. In addition, it is difficult to manufacture such a tubular structure.

Correspondingly, the drying pipe structure based on filtration is also disclosed in Norwegian Publication No. 129, 809. In this solution, the entire pipe is surrounded by the material to be filtered. With a large amount of filter material, the functional life of the pipe has naturally been longer than in the structure according to the above-described Finnish application no. 2875/65, but clogging over time is obvious in this structure as well. The filter material in the structure is also very sensitive to the handling already during the installation phase, in which case it is possible that partial clogging starts already at this stage.

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The object of the invention according to our application is, unlike before, to provide a drying pipe arrangement in which the blockage of the pipe holes due to fine soil has been eliminated by utilizing the sedimentation of the inflowing water before it is allowed into the pipe inflow openings. This principle has been applied to a drying pipe arrangement provided with drainage water inlets located exclusively in the upper half of the drying pipe, in which an outer part, such as an outer plate, is mounted on the drying pipe openings so that water can rise in the space between the outer part and the drying pipe. A drying tube structure similar to that described is known from GB Patent No. 267,817, but it does not realize the importance of providing a sufficient sedimentation distance.

Thus, according to the invention, the structure is substantially improved so that the outer part is made to extend downwards to the same level as the lowest part of the drying pipe to limit the inflow into the intermediate space in the region of that level.

Other features of the invention will be apparent from the appended claims and from the following description with reference to the accompanying drawings.

Figure 1 shows a first embodiment of an arrangement according to the invention.

Figure 2 shows a second embodiment of an arrangement according to the invention.

Figure 3 shows a third embodiment of an arrangement according to the invention.

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Figure 4 shows a fourth embodiment of an arrangement according to the invention.

Figure 5 shows a variation of the embodiment of Figure 4.

Fig. 6 shows a further variant of the embodiment according to Fig. 4.

Figure 7 shows a variation of the embodiment of Figure 5.

Figure 8 shows a variation of the embodiment according to Figure 3.

Figure 9 is a perspective view of an outer plate for use with the arrangements shown in Figures 6 and 7.

Fig. 10 shows an external plate according to the invention for use in the arrangement according to Fig. 3.

Figure 11 shows a fifth embodiment of an arrangement according to the invention.

Fig. 12 is a variant embodiment of the arrangement according to Fig. 11.

Fig. 1 shows a drying pipe 1, which is picked up and provided with a row of inflow holes 3. The drying pipe is covered with an outer plate 1 extending from the bottom plane over the top of the drying pipe partly downwards on the opposite side of the drying pipe. A seal between the tube and the plate is arranged longitudinally between the drying tube and the outer plate. Thus, an inflow zone is formed for the water, as well as an outflow zone consisting of the inner part of the pipe 2. Figure 2 shows a drying pipe 2 with an inflow hole row 3f in which the drying pipe is completely covered by an outer plate 5 placed on the bottom plane. In this case, it can be immediately seen that two inflow zones and one outlet zone consisting of the inner part of the pipe 2 are formed. In the embodiment according to Figure 2, the pipe is corrugated.

Fig. 3 shows an outer plate 6 with support ribs 6 ', which support ribs are shaped according to the drying tube, to fit its surface. In this case, two inflow zones are thus formed, i.e. between the plate 6 and the drying pipe, on both sides of the drying pipe.

Similarly, in Figs. 4 and 5, an outer plate 7 is provided with protruding legs 8, and in Fig. 5, a filter mat 9 is further provided, on which both the outer plate and the drying tube are placed. In the embodiments shown in Figures 1-5, the drying tube is shown to be corrugated, while the outer sheet has a smooth surface. However, the drying tube may also have a smooth surface and a corrugated shape on the outer plate, respectively, as shown in the embodiments of Figures 6 and 7. Fig. 6 shows a drying pipe 11 provided with a corrugated outer plate 10. In the embodiment according to Fig. 7, the unit of Fig. 6 is placed on a filter mat 9. The function of the filter mat 9 is to ensure efficient filtration of the incoming water.

In Fig. 8, the outer plate 12 is forced over the drying pipe 2. In the form shown, the outer plate is smooth 5 71 807 and the tube is corrugated, but the situation could also be the opposite, or both elements may be corrugated to a different degree of corrugation.

Figures 9 and 10 show by way of example the outer plates used in connection with the embodiments of Figures 6 and 7 and the embodiment of Figure 3, respectively.

The openings can be made substantially larger than in conventional drying tubes. Because the water to be removed slowly rises upwards before it reaches the openings, sand, earth, material particles, etc. precipitate and do not pass into the drying pipe. Another significant advantage of the system is that the soil masses can be put back into the ditch on top of the drying pipes after the pipes and their cover plates or the like have been placed on a regular filter layer, sand, gravel, sawdust or other material.

Figures 11 and 12 show arrows showing how the outgoing water flows into the inlet zone of the arrangement and down into the central outlet zone of the arrangement.

The arrangement according to Figures 11 and 12 consists of two parts, the first part being made of an inner pipe 13, in which said inflow openings 16 are located in the upper half of the pipe. This pipe 13 is thus formed in the outflow zone of the arrangement. The second part consists of a tube or jacket 14 which surrounds the first part and in which said openings are in the lower half of the tube or jacket. As can be seen from Figures 11 and 12, the lower half of the jacket may have, for example, one or two rows of inflow openings 17. Alternatively, instead of said single row of holes, there may be a slot arranged in the longitudinal direction of the jacket, as in principle for the embodiment of Figure 8.

Claims (10)

A drainage pipe device adapted to withstand the soil pressure and provided with inlet openings (3, 16) for the water to be discharged, which openings are located only in the upper half of the drainage pipe (2, 13), and in which means above the drainage pipe openings an outer part (1,5,6,7,10,12,14), such as an outer plate spaced from the drainage pipe, said that the water can rise in the space between the outer part and the drainage pipe, characterized in that the outer the portion (1,5,6,7,10,12,14) extends down to the same level as the lower portion of the drainage tube, thereby limiting the flow into the space in question to the area of said level. Device according to claim 1, characterized in that the outer part is fixed to the drainage pipe by welding, gluing or the like. Device according to claim 1, characterized in that the outer part is fixed to the drainage pipe by means of snap coupling. 4. Device according to claim 1, characterized in that the surface of the drainage pipe is corrugated and that the outer part has a sieved surface. 5. Device according to claim 1, characterized in that the surface of the drainage pipe is smooth and that the outer part has a corrugated surface. 6. Device according to claim 1, characterized in that both the drainage pipe and the outer part have a corrugated surface with different gradations.