Method for producing a lining tube for restoring fluid-conducting pipe systems

Abstract

The invention relates to a method for producing a lining tube for restoring fluid-conducting pipe systems, comprising a circumferentially closed inner film tube and at least one resin-impregnated fibre band wrapped around the inner film tube, wherein the inner film tube is supplied to the rear end of a wrapping device in the feed direction during the wrapping process and the supply of energy to the wrapping device is wireless.

Description

Method for manufacturing a lining hose for the rehabilitation of fluid-carrying piping systems

[0001] The present invention relates to a method for producing a lining hose for the rehabilitation of fluid-carrying pipe systems with a fully enclosed inner foil hose and at least one resin-impregnated fiber tape wound on the inner foil hose.

[0002] A particularly elegant method for the rehabilitation of fluid-carrying piping systems, e.g., canals and similar pipe systems, consists of inserting a flexible fiber hose impregnated with reactive resin, which serves as a lining hose (liner), into the piping system, inflating it so that it fits snugly against the inner wall of the piping system, and then allowing the resin to harden.

[0003] Corresponding lining tubes containing textile materials within a supporting structure are known per se and described in the literature. These known lining tubes generally have an inner foil tube onto which the supporting structure is applied.

[0004] The inner film tube can be used as a pre-made seamless, fully enclosed tube, or an inner film tube can be used that is obtained by joining the longitudinal edges of a flat film or by welding the longitudinal edges of two flat films.

[0005] From DE A 4326 503, a method for manufacturing a tubular lining hose is known, in which a resin-impregnated fiber tape is wound helically into a hose mold, wherein a film hose forming an inner protective film is first produced by helically winding a film tape, onto which the resin-impregnated fiber tape is then wound. This necessitates welding equipment in the manufacturing apparatus, which increases its complexity and is economically disadvantageous.

[0006] From WO2017 / 059937 a method for producing a lining hose for lining channels and pipelines is known, wherein the lining hose has a fully enclosed inner foil hose and at least one resin-impregnated fiber tape wound onto this inner foil hose, wherein the prefabricated inner foil hose is wound onto a freely mounted support tube in a winding device against a feed direction.

[0007] From DE A 198 23714, a winding device for producing a lining tube with a winding mandrel is known, wherein the winding mandrel has a storage section for threading an inner film tube, and supporting devices arranged at intervals are associated with the storage section, which can be moved towards the storage section to support the winding mandrel and moved away from the storage section to advance the film tube. As in the method of WO 2017 / 059937, the tube serving as the inner film tube is wound onto the storage section against the feed direction during winding before the actual winding process.

[0008] EP 3 178 633 relates to a winding mandrel in a winding device for producing a lining tube, in which the inner film tube is fed from a supply section during the winding process in the feed direction of the winding process. Again, the length of the supply section determines the maximum producible length of the finished lining tube, and the lining tube must be applied to the supply section of the winding mandrel before the actual winding process.

[0009] The maximum length of the inner foil tube that can be pulled on is determined, according to the prior art described above, by the length of the retaining tube or supply section onto which the inner foil tube is placed before the actual The winding process must be interrupted. This limits the maximum length of the liner tube that can be produced before the winding process has to be interrupted and a new length of inner foil tube wound to create a new liner tube section. However, it would be desirable if longer lengths of liner tubes could be produced in a single, uninterrupted step. Joining sections of liner tubes, which becomes necessary when longer lengths are required than can be produced in a single, uninterrupted winding process, always carries risks regarding the system's tightness and stability.

[0010] The object of the present invention was therefore to provide a method in which the maximum length of a lining tube that can be produced in one step without interruption is not limited by the maximum length of an inner film tube that can be applied to a supply section of the winding mandrel.

[0011] This problem is solved according to the invention by the method according to claim 1. Preferred embodiments of the method can be found in the dependent claims and the following description.

[0012] According to the inventive method for manufacturing a lining hose for the rehabilitation of fluid-carrying pipe systems, comprising a fully enclosed inner foil hose and at least one resin-impregnated fiber tape wound onto the inner foil hose, the inner foil hose is fed to the rear end of a winding device in the feed direction during the winding process, and the winding device is powered wirelessly. Thus, a length of inner foil hose, limited by the length of a supply section, is not wound onto a supply section against the feed direction before the actual winding process; rather, the supply of the The inner film tube is preferably fed continuously during the winding process in the feed direction from the rear end of the winding device. This is not possible with methods known in the prior art, since the power supply and control of the winding device are provided via cables from the rear end of the device, which makes a continuous feed of the inner film tube to the rear end of the winding device in the feed direction during the winding process impossible because the power supply and control cables prevent this.

[0013] The inner film tube is fed to the rear end of the winding device via a device preferably designed and configured for the continuous feeding of the inner film tube. This can, for example, be a supply roll that can hold the inner film tube in the length required for the desired length of the lining tube. During the winding process, the inner film tube can then be continuously fed from this roll to the rear end of the winding device in the feed direction at the same speed as the inner film tube is transported in the feed direction during the winding process. The achievable length of the lining tube is therefore no longer limited by the length of the inner film tube that can be wound onto the winding mandrel or a supply device associated with the winding mandrel before the winding process.Furthermore, the continuous feeding of the inner film tube during the winding process is easier, since the inner film tube does not have any creases caused by the previous winding, which always pose a risk of damage during the winding process.

[0014] Suitable devices for feeding an inner film tube to the rear end of the winding device are known to those skilled in the art and described in the literature, so further details are unnecessary here. The skilled person will use their general technical knowledge to select a suitable device that... The winding process of the lining tube allows it to be shaped as desired and as specified by the particular application.

[0015] According to one embodiment, the inner film tube can be fed to the rear end of a winding device that has two or more movable support beams with a clamping device. During the feeding of the inner film tube, these clamping devices are alternately moved apart so that the inner film tube can be fed in the forward direction. To this end, the clamping device closest to the rear end of the winding device is first opened, and the inner film tube is fed to the next clamping device in the forward direction. Subsequently, the clamping device closest to the rear end is closed, and the next clamping device in the forward direction is opened, so that the inner film tube can be transported further in the forward direction between the clamping device closest to the rear end and the next clamping device in the forward direction.By alternately opening and closing the clamping devices, it is possible to feed in any desired length of inner film tube during the winding process. Such designs are familiar to those skilled in the art, and they will select a suitable device using their general expertise.

[0016] Alternatively, the winding cylinder or winding mandrel of the winding device can be suspended, i.e., without support beams or similar devices. This can be achieved, for example, by using sufficiently strong magnetic fields to hold the winding cylinder in free suspension. This simplifies the feeding of the inner film tube to the rear end of the winding device, as there is no need for the alternating opening and closing of mobile clamping devices.

[0017] According to one embodiment of the method according to the invention, the power required for operating the winding cylinder or the winding mandrel is Energy is supplied without contact and not along electrical lines and via electrical contacts, but through non-cable- or wire-bound electromagnetic fields.

[0018] In cable-free or wireless energy transmission, a distinction is made between energy supply in the near field and energy transmission in the far field.

[0019] Wireless power transmission in the near field is also known as non-radiative coupling. Wave phenomena play no role in non-radiative coupling in the near field.

[0020] The most widespread method in this context is inductive energy transfer, which is therefore also preferred according to the invention. This method exhibits good efficiency, which depends on the distance between the components (transmitter and receiver). Generally, the smaller the distance between transmitter and receiver, the better the efficiency.

[0021] For inductive energy transfer via inductive coupling, an alternating magnetic field is generated in the transmitter using an oscillator. The transfer typically occurs through mutual induction between two coils – one in the transmitter and one in the receiver. The alternating current in the transmitting coil induces an alternating voltage in the receiving coil. This voltage can be used for power supply and control. The operating principle is similar to that of a transformer with loose coupling between the two coils. The distance between the two coils represents the wireless transmission path and should be as small as possible to achieve the highest possible efficiency.

[0022] The resonant inductive coupling that can also be used in the method according to the invention represents an extension of inductive coupling with the aim of increasing the limited range. For this purpose, one or more free resonant circuits are placed in the free space between the transmitting and receiving coils. Each of these resonant circuits can consist of a capacitor and an inductor. whose resonant frequency is tuned to the transmission frequency. The resonance between the resonant circuits leads to improved magnetic coupling between the transmitting and receiving coils at the transmission frequency. This results in a greater range and better efficiency.

[0023] Capacitive coupling uses a similar basic structure to inductive coupling, but instead of capacitive coupling, it utilizes an electric field for wireless energy transfer between two metal plates. These metal plates act as electrical capacitors, and the area between them forms the wireless energy transmission path. The two capacitors are supplied with alternating current, typically generated by an oscillator on the transmitter side. On the load side, the voltage is rectified, if necessary, and then supplied to the device.

[0024] Far-field energy transfer is also known as radiative energy transfer and is based on electromagnetic waves. Examples include energy transfer using light, lasers, or radio waves.

[0025] The main difference between non-radiative near-field coupling and radiative far-field coupling lies in the range. Near-field coupling is generally limited to short distances between transmitter and receiver, e.g., from a few centimeters to the low meter range. However, it can usually transmit higher power levels with better efficiency than far-field energy transmission.

[0026] In another embodiment, wireless power can be supplied via a battery integrated into the winding cylinder or mandrel. This battery is charged before the winding process and then provides the energy required for winding. After completion of the winding process, the battery can be recharged during the preparation phase for the next winding. The battery can be recharged during the winding process to provide energy for the next winding cycle. Alternatively, the battery used during the winding process, which is fully or partially discharged, can simply be replaced with a charged replacement battery.

[0027] According to another embodiment, the accumulator can also be continuously charged wirelessly, e.g. inductively, during the winding process, so that continuous operation without interruption for the replacement of the accumulator is possible.

[0028] It is clear from the above that, in principle, any design is possible that allows for a wireless supply of the required energy.

[0029] It is essential that neither the power supply nor the control of the winding device requires a power supply via a cable at the rear end of the winding device. Such a cable would make it impossible to feed any length of inner film tubing to the rear end of the winding device.

[0030] According to the inventive method, at least one resin-impregnated fiber tape is wound onto the inner foil tube supplied to the rear end, which can preferably be cured by light, particularly preferably by UV light. Alternatively, curing is also possible by heat, steam, hot water, ionizing or other radiation. For chemical curing, hardeners known to those skilled in the art can be used.

[0031] Such procedures are known to those skilled in the art and are described in the literature. DE 43 26 503, DE 1 98 23714 and WO 2017 / 059937 are mentioned here by way of example, and reference is made to them for further details.

[0032] The method according to the invention is fundamentally suitable for the production of any lining tubes in which at least one resin-impregnated fiber tape is applied to an inner foil tube, For example, they are wound up and are known to those skilled in the art in a multitude of embodiments and described in the literature. There is no restriction regarding the materials that can be used or the structure of the lining hoses that can be manufactured.

Claims

Patent claims 1. A method for producing a lining hose for the rehabilitation of fluid-carrying line systems with a circumferentially closed inner film hose and at least one resin-impregnated fiber tape wound on the inner film hose, characterized in that the inner film hose is fed to the rear end of a winding device in the feed direction during the winding process and the energy supply of the winding device is wireless.

2. Method according to claim 1, characterized in that the wireless energy supply is inductive.

3. Method according to claim 2, characterized in that the inductive energy supply is effected by non-radiative coupling.

4. Method according to claim 1 or 2, characterized in that the wireless energy supply is provided via an accumulator.

5. Method according to claim 3, characterized in that the accumulator is supplied with energy inductively through the inner film tube.