FI87820B - Procedure and arrangement for lagging a drainage pipe. - Google Patents

Description

37 820

Method and apparatus for shrouding drains Pörfarande och anordning för att piston in dräneringsrör

The invention relates to a method and an apparatus for enveloping drainage pipes, wherein the outer surface of the drainage pipe is surrounded by a loose, highly permeable filling material.

It is known in the art to jacket drainage pipes in order to achieve the best possible transition between the soil and the pipe without the risk of clogging. A liquid-permeable material is used to sheathe the pipes, which is usually attached to the pipe. The drain pipe itself is a plastic pipe with slots spaced apart. Depending on the properties of the soil, these gaps become blocked sooner or later after the pipe has been dug into the ground, so that the drainage pipe can no longer fulfill its function.

In order to avoid clogging of the drain pipes, it is necessary to create a larger or smaller empty space between the drain pipe and the surrounding jacket. When the drain pipe comprises: slots spaced apart from each other, the total open area of which is thus only relatively small,. again, the sheath can be made so that its entire surface is permeable to liquid. However, when such a liquid-permeable cover “V” is placed immediately on top of the drain pipe, its effect is then limited by the area determined by the slots in the drain pipe.

The object of the invention is to make the ability of the drainage pipe to penetrate the liquid independent of the quality or properties of the soil in which the drainage pipe is subsequently immersed. In addition to this, the task is to increase the outer surface of the tube which is able to absorb liquid. According to the invention, this is carried out with a non-fibrous mat made of a liquid-permeable material, the non-fibrous mat being kept at such a distance from the surface of the draining tube that there are no obstructions in the non-fibrous mat due to the soil. The invention is characterized in that the drain pipe is led inside a hollow screw conveyor, whereby the hollow screw conveyor receives the filling material, transports it and brings it quantitatively to the drain pipe, in connection with which the filling material is held in place as a drain pipe by means of a nonwoven. The characteristic features of the equipment required to carry out the method are set out in claim 4. Other details of the invention are set out in the claims.

The method and the equipment required for it are described below by means of an example. The drain pipe 1 is either a rigid pipe, preferably made of plastic, or a flexible pipe, and has circumferentially spaced slots or holes through which the liquid can pass. This drain pipe is lined with a material, preferably a non-fibrous mat 6, in which case care must be taken to ensure that this non-fibrous mat remains at a sufficient distance from the surface of the pipe. To keep the distance, a material is used that is so loose that it is able to pass through the liquid. Styrene plastic balls are particularly suitable for this purpose, but other natural materials can also be used, such as bark, coconut fibers and the like.

In practice, it has proved expedient that the thickness of the filling material is chosen depending on the purpose of the pipes ‘‘ ’. The greater the risk of clogging, the thicker the layer of filling material selected. The nonwoven mat has two functions, on the one hand to guarantee the necessary ability to penetrate the liquid, and on the other hand to surround the loose filling material placed on the pipe so that it meets the requirements set for it even in heavy use.

The production of such sheath layers takes place by a method in which a screw conveyor receives the filling material, transports it and guides it to the surface of the drain pipe. The amount of filler carried by the screw drive then determines the thickness of the layer to be formed. Sheathing on the fiber mat already begins in the transport area of the 3 87820 screw conveyor, so that the screw conveyor is guided into the pipe so that when the filling material protrudes out of the screw conveyor it can immediately move to the empty space formed by the fiber mat. The drain pipe, in turn, passes in the middle of the hollow screw conveyor and protrudes from this empty space at the end of the screw conveyor, immediately forming a corresponding jacket on it.

To adjust the thickness of the jacket, the speed of the screw conveyor, i.e. the filling speed of the filling material, the non-fibrous speed, and the speed at which the drain pipe is pulled through the hollow screw conveyor can be matched to determine the filling amount and the filling thickness.

An apparatus suitable for carrying out this method is described in the drawing. The device comprises a storage tank 4, from which the transport pipe 3 starts immediately. The transport pipe 3 is open in the area of the storage tank 4, so that the filling material 5 enters the pipe 3. A hollow screw conveyor 2 runs inside the pipe 3. This screw conveyor is rotatably mounted and has its own drive. The device is assembled in such a way that the screw conveyor can be: 'easily replaced so that different screw conveyors can be used in the device in terms of pitch. The drain pipe 1 can be passed through a hollow screwdriver. In the illustrated example, the drainage pipe is passed through the hollow screw conveyor from left to right in the direction of the arrow. The function of the bearing bracket 11 and the drive device 12 is to bear and rotate the screw conveyor 2. By rotating the screw conveyor 2 having a storage container 4 According to the filler material 5, and carry it forward inside the tube 3 in the direction of the arrow. At the same time during the stage of drainage pipe 1 is pushed in the direction of the arrow. · '. through the hollow screwdriver. At the end of the screw drive there is a screw-through device 9, through which a drain pipe is also passed.

The fiber mat 6 is guided to the surface of the pipe 3 by means of a steering wheel. The fiber mat 6 is immediately applied to the surface of the tube 3 by means of brushes 8. Entangling device 9 grips the fiber mat 6, and the drainage pipe to carry it along in the direction of the arrow.

4 87820 The processing step takes place as follows: the drain pipe 1 is introduced into the hollow screw conveyor 2, the filler 5 is conveyed in the pipe 3 by rotating a screw conveyor which is fed at the end of the pipe 3 and thus also at the end of the screw conveyor 2 directly on the drain pipe. During this rotating movement, the nonwoven mat 6 is continuously pulled over the tube 3 and wrapped around the tube 3 by means of brushes 8 so that the cover formed at the end of the tube 3 from this nonwoven mat is immediately applied to the drainage tube surrounded by the filling material. In order to keep the nonwoven mat in this position, the wrapping device 9 is provided with a wire 13 which is wound around the nonwoven during a corresponding rotational movement and which thus firmly binds the nonwoven fabric on top of the filling material to the drain pipe. Thereafter, the pre-sheathed drain pipe 10 protrudes from the end of the wrapping device and can be wound on cylinders or the like.

The speed at which the nonwoven mat is pulled over the transport tube 3 remains constant. Likewise, the speed of the winding device 9 is kept more or less constant. In contrast, the speed of the screw conveyor can be varied. Depending on how much filling material is desired between the drain pipe and the nonwoven, the speed is increased or decreased, whereby more or less filling material is obtained at the end of the transport pipe 3 in a unit of time. At the same time, since the drain pipe is pulled through the hollow screw conveyor at an almost constant speed, the amount of filler material obtained per unit area of the drain pipe can be controlled in this way. Thus, the thickness of the sheath can also be influenced in other ways than by using a screw conveyor with different pitches.

The non-woven mat can, of course, be tied in a wrapping device so that it is guided at the end of the conveying tube 3 helically around the drainage tube covered by the filling material, whereby a good sheath is produced.

Claims (8)

A method of sheathing the cover tube, wherein the outer surface of the cover tube is surrounded with loose, well-permeable filling material (5), characterized in that the cover tube (1) is guided inside a hollow screw conveyor (2), the hollow screw conveyor (2) receives the filler material (5), transports it and brings it quantitatively to the cover tube (1), and the filler material (5) adjacent thereto is held in place on the cover tube (1) by means of a fiber mat (6). 2. A method according to claim 1, characterized in that the fiber mat (6) is guided on top of the hollow screw conveyor (2), at the same time surrounding the cover tube (1) and the filler material (5) at the end of the screw conveyor. Method according to claim 1, characterized in that the speed of the hollow screw conveyor (2) is varied. . 4. Apparatus for carrying out the method according to the above, characterized in that a storage container (4) containing filling material (5) is connected to a transport tube (3) inside which a hollow screw conveyor (2) is rotatably stored. , and that the cover tube (1) is passed through the inner portion of this hollow choke conveyor. 5. Device according to claim 4, characterized in that brushes (8) are arranged around the transport tube (3) which extend a fiber mat (6) around the transport tube. 6. Device according to claim 4 or 5, characterized in that at the end of the hollow screw conveyor (2) there is arranged a winding device (9) which wraps a tree (13) around the filled casing cover tube (13). 1). 8 87820 Device according to any of the claims 4. . 6, it can be seen that the fiber mat (6) is guided in a longitudinal direction above the transport tube (3) via a guide roller (7). Device according to any of the claims 4. . 7, it may be noted that the hollow screw conveyor (2) is interchangeable with respect to one pitch.