Method for attaching a coating to a hose

Abstract

The invention relates to a method for attaching a lining (4) to a hose (1), in particular a calibration hose, comprising: - providing the hose (1) with a first end (2) and a second opposite end (3); - applying a mark (5) to the hose (1); - turning the hose (1) over by rotating the first end (2) on the outside (13) of the hose (1) towards the second end (3) or vice versa until the mark (5) is reached, so that a reversal point (12) is formed; - inserting the lining (4) into the hose (1) and placing the lining (4) at the reversal point (12) of the hose (1); - inserting a bladder (6) into the lining (4) in the region of the reversal point (12) and expanding the bladder (6); - inserting a fastening element (7) at the reversal point (12) between the lining (4) and the tube (1) so that the lining (4) is secured to the tube (1); and - remove the bladder (6) and turn the tube (1) back to its original position.

Description

[0001] The invention relates to a method for attaching a liner to a hose, in particular to a calibration hose.

[0002] German patent DE 44 26 151 A1 describes the lining of a pipe with a liner for pipe rehabilitation. A flexible fiber tube, known as a liner, is inserted into the pipe, such as a pipeline or sewer. The fiber tube is impregnated with curable resin and is applied to the inner surface of the pipe to be rehabilitated.

[0003] Liners are resin-impregnated, flexible fiber tubes that are inserted into a pipeline or sewer to be rehabilitated by means of inversion and cured by means of heat, UV radiation or ambient temperature.

[0004] The lining of the aforementioned type is designed such that the resin-impregnated fiber hose, including an auxiliary hose called a calibration hose, is inverted (turned inside out or turned inside out) into a pipe section to be rehabilitated, and that after the resin-impregnated fiber hose has hardened, the calibration hose is removed by pulling it back (reverse inversion process), thus applying the fully formed and hardened lining over the appropriately selected length and cross-section of the pipe.

[0005] If only a small section of the pipe needs to be rehabilitated, packers are used, for example. These are vapor-tight, expandable bladders available in various nominal diameters and connection angles, such as those offered by Brawo Systems. This company sells custom-fit packers with an approximately 35 cm long, extendable satellite bladder that can be inserted and positioned using a flexible push rod. The disadvantage of this solution is that different packers are required depending on the nominal diameter of the pipe being rehabilitated, which is very costly.

[0006] US Patent 5,964,249 A describes a pipe repair device comprising an outer support tube, an inner bladder tube within the support tube, and a repair sleeve within the bladder tube. The bladder tube and support tube are formed by a single tube that is folded back on itself. A wick extends from the repair sleeve to the rear end of the bladder tube, allowing gases to be evacuated from the bladder tube. The bladder tube can be unscrewed from the support tube so that a repair sleeve comes into contact with a section of sewer pipe requiring repair.

[0007] US 8,375,972 B2 discloses a device and a method for reinforcing the portions of an inflatable bladder that are not surrounded by a liner during pipeline renewal. A liner / blade assembly is provided in which the liner is positioned relative to the bladder such that a portion of the bladder with a greater wall thickness extends beyond the ends of the liner.

[0008] The invention is therefore based on the objective of providing an alternative method for attaching a liner to a hose and for lining, in particular rehabilitating, a pipe, which is improved compared to the known methods.

[0009] According to the invention, this problem is solved with regard to the method by the subject matter of claim 1.

[0010] Specifically, the problem is solved by a method for attaching a liner to a hose, in particular a calibration hose, wherein the method A hose with a first end and an opposite second end is provided; a mark is made on the hose; the first end is turned inside out over the outside of the hose towards the second end or vice versa up to the mark, creating an inversion point; a liner is inserted into the hose and positioned at the inversion point; an bladder is placed in the liner in the area of ​​the inversion point and expanded; a fastener is inserted at the inversion point between the liner and the hose in such a way that the liner is held to the hose; and the bladder is removed and the hose is turned back inside out.

[0011] A further significant advantage of the invention lies in the fact that the liner is pre-positioned within the hose before being inserted into the pipe to be rehabilitated and connected to the hose via the fastening element. This is achieved by inserting the fastening element between the liner and the hose at the point where the hose is inverted. Once the liner is pre-positioned and held in place by the fastening element, the bladder is pulled out and the section of hose that has been inverted over the outside of the hose is turned back inside out. In this state, the liner is preferably completely inside the hose.

[0012] The hose, when inverted, is back in its original position. The original position corresponds to the state, particularly the initial state, of the hose before and / or after one of its ends has been inverted. In its original position, the hose is preferably free of any inversion of the first and / or second end.

[0013] In pipe lining, the liner is inserted into the pipe to be lined by inverting or turning the hose inside out and positioning it at the appropriate location. The method according to the invention therefore has the advantage that special packers, e.g., vapor-tight, expandable bladders, are not required. Furthermore, existing or conventional calibration hoses and liners can be used. The method according to the invention thus greatly simplifies the fastening of a liner in a hose and the lining of a pipe. This also results in cost savings.

[0014] To create the inversion point, the first end of the hose is turned inside out over its outer surface towards the second end until it reaches the mark. Alternatively, the hose can be turned inside out in the opposite direction, by turning the second end inside out over its outer surface towards the first end until it reaches the mark. In either case, this corresponds to the inverted state of the hose.

[0015] Advantageous embodiments of the invention are set out in the dependent patent claims.

[0016] In a preferred embodiment, the area to be rehabilitated within a pipe is determined, and this information is used to define the marking on the liner. In other words, the required distance of the marking from at least one end of the liner is determined by first capturing the position of the area to be rehabilitated within the pipe, particularly using a camera. This enables simplified, precise placement of the liner at the desired rehabilitation location within the pipe.

[0017] Preferably, an adhesive, particularly a cyanoacrylate adhesive, is used as the fastening agent. The cyanoacrylate adhesive can be a so-called superglue. The adhesive advantageously allows the liner to be bonded to the hose in such a way that the liner is held in place on the hose, especially when being inverted into a pipe, and / or is detached from the hose when the hose is removed from / into a pipe.

[0018] In a further preferred embodiment, the bladder is expanded only to the extent that the fastening element can be inserted at the inversion point between the liner and the hose. In other words, the bladder is expanded radially to such an extent that the liner is held in contact with the hose, and the fastening element can still be applied, and in particular inserted, between the liner and the hose. The contact pressure of the bladder against the liner, and thus the hose, is preferably selected such that the fastening element can still be inserted, and in particular flowed into, the inversion point between the liner and the hose. This facilitates the insertion of the fastening element.

[0019] Additionally or alternatively, after the fastening material has been inserted, the bladder is further expanded at the inversion point between the liner and the tube. This promotes the formation of a firm bond between the liner and the tube.

[0020] Preferably, the bubble is removed after the fastener has sufficiently hardened to hold the liner to the tube. The advantage here is that the bubble only remains in the liner for as long as necessary, thus saving time. When using an adhesive as the fastener, for example, the adhesive may be partially or completely cured by the time the bubble is removed.

[0021] It is particularly advantageous if the liner protrudes slightly beyond the hose at the inversion point, as this simplifies the insertion of the fastening element. Preferably, the liner protrudes 0.5 cm to 5 cm, more preferably about 1 cm to 2 cm, and particularly about 1 cm, beyond the hose at the inversion point.

[0022] In one embodiment, the hose is inverted into a pipe, in particular by being turned inside out, such that the liner is arranged or comes to lie within the pipe. Preferably, the liner is introduced into the pipe using an inversion machine. The liner is preferably a resin-impregnated, flexible fiber hose. Particularly preferably, the liner is cured by heat, UV irradiation, and / or ambient temperature.

[0023] Once the liner is secured or positioned inside the pipe, the hose is removed. Preferably, only the liner remains in the section of the pipe requiring rehabilitation.

[0024] The following section provides a more detailed explanation of exemplary embodiments of the invention with reference to the drawings. Functionally identical elements are designated with the same reference numerals in the various figures.

[0025] They show, Figs. 1 to 7 show schematic representations of various steps of a method according to the invention for attaching a liner to or in a hose; and Fig. 8 shows a schematic representation of a liner attached to or in a hose according to the invention in an installation position in a pipe.

[0026] Only the elements essential for an immediate understanding of the invention are shown.

[0027] Figs. 1 to 7 show various steps of a method according to the invention for attaching a liner 4 in a tube 1 and Fig. 8 the installation and positioning of the liner 4 in a pipe 20.

[0028] Fig. 1Figure 1 shows a hose 1, a so-called calibration hose, with a first end 2 and a second end 3. The calibration hose 1 is preferably flexible enough to bend up to 90° with respect to its longitudinal axis. In other words, the calibration hose 1 is preferably bendable up to 90°. The calibration hose 1 can be used with a liner 4 impregnated with epoxy resin and / or polyester resin.

[0029] The calibration hose 1 is preferably transparent and made of a polyvinyl chloride material, in particular PVC. The calibration hose 1 is preferably suitable for use up to a maximum of 50°C and can, for example, be used in a double-reinforced version up to 100°C. Furthermore, the calibration hose 1 can withstand a maximum pressure of 0.5 bar and has a basis weight of 400 g / m². It should be noted that the calibration hose 1 is not limited to the aforementioned values. Alternative calibration hoses 1 can also be used within the scope of the invention.

[0030] In a pipe 20, for example a pipeline or a sewer, a certain section of the pipe 20 is to be rehabilitated by means of a liner 4. Such liners 4 preferably consist of a woven or nonwoven fabric or a nonwoven material and are preferably elastic. The liner 4 preferably consists of a longitudinally and transversely elastic textile tube, in particular a woven tube. Preferably, the textile tube is made of polyethylene terephthalate, in particular PET. The textile tube is preferably laminated, in particular sheathed, with a film tube. The textile tube and / or the film tube are seamless. Furthermore, the textile tube and the film tube are bendable up to 90°, i.e., capable of bending up to 90°.

[0031] The liner 4 can be provided with or be provided with an adhesive, in particular with a curable synthetic resin mixture, especially preferably a curable epoxy resin mixture.

[0032] The curable resin mixture is preferably a two-component epoxy resin system in a bucket, comprising a resin component, in particular EP 50 A resin, and a hardener component, in particular EP 50 B hardener, and enriched (dixotropic) with fillers. It is therefore advantageous if the curable resin mixture is a solvent-free epoxy resin system that exhibits improved adhesion properties with respect to common wastewater pipe materials and wet substrates, especially wet surfaces.

[0033] The liner 4 is soaked with resin immediately before being inverted into the tube 20 and rolled to the appropriate thickness.

[0034] By measuring the pipe 20, preferably with a camera, it is determined where the liner 3 must be positioned in the pipe 20 so that the corresponding section can be rehabilitated and repaired. A corresponding mark 5 is made on the calibration hose 1, preferably using a waterproof marker, at the point where one end of the liner 4 must lie in the pipe 20 and thus against the calibration hose 1 to be inserted into the pipe 20, so that the liner 4 is positioned according to the section to be rehabilitated. This marks the precise location where the liner 4 must lie on the calibration hose 1 and be secured.

[0035] According to Fig. 2 The first end 2 of hose 1 is now turned inside out towards the second end 3 until hose 1 is turned inside out up to mark 5 on the calibration hose 1, creating a fold 12 at mark 5. Then, according to... Fig. 3The liner 4 is drawn into the inverted tube 1 and positioned at the inversion point 12 such that it later lies within the pipe 20 at the point to be repaired, with the appropriate tolerances. The liner 4 can be inserted from the second end 3 or from the inversion point 12 at the end position 5 towards the second end 3. The liner 4 is then preferably positioned so that it protrudes slightly from the inverted tube 1, preferably by about 0.5 cm to 5 cm, more preferably by 1 cm to 2 cm, and particularly by about 1 cm beyond the inversion point 12.

[0036] According to the Fig. 4 and 5 An expandable bladder 6 is then inserted, at least partially, preferably predominantly, into the liner 4 and the tube 1. Any expandable object can be used as the expandable bladder 6, preferably a balloon-like object that can be inflated with compressed air.

[0037] The bladder 6 is now expanded, preferably inflated, to such an extent that the liner 4 can no longer displace relative to the calibration tube 1, but only to the extent that it is possible to insert a fastening element 7 between the liner 4 and the tube 1 at the inversion point 12. The fastening element 7 is preferably inserted using an applicator 8, preferably with a conical nose. The fastening element 7 is preferably an adhesive. A commercially available adhesive suitable for the materials to be bonded can be used, for example, an epoxy-based adhesive, hot melt adhesives, etc., but preferably a so-called superglue, in particular a cyanoacrylate adhesive, is used. However, it is also possible to use other fastening elements 7 as adhesives.

[0038] The fastening element 7 is bonded at least at two points, preferably over at least 50 percent of the liner circumference, particularly preferably over 80 percent of the liner circumference, and especially continuously over the entire liner circumference. The width of the bonding surface 9 thus created by the fastening element 7 preferably has a width of 0.1 mm to 2 cm, particularly preferably from 1 mm to 1 cm.

[0039] The bladder 6 can then preferably be inflated further so that the liner 4 fits firmly against the calibration hose 1 and is securely attached.

[0040] Preferably, the bladder 6 is inflated to 1.5 bar, more preferably to approximately 2 bar. However, depending on the design, the bladder 6 can also be inflated to a higher pressure. Fig. 6 For example, the bladder 6 is shown in the expanded state, with the liner 4 and the calibration tube 1 radially extended through the bladder 6.

[0041] Then, one waits until the fastening element 7 holds the liner 4 securely to the hose 1. Preferably, with an adhesive, one waits until sufficient curing is achieved, and particularly preferably until the adhesive is almost completely cured. When using a conventional cyanoacrylate adhesive, approximately 30 minutes are allowed to ensure that the liner 4 is sufficiently held to the calibration hose 1. With other adhesives, this time is adjusted accordingly until sufficient strength is achieved so that the liner 4 is held to the hose 1.

[0042] Then the pressure is released from bladder 6, preferably as slowly as possible, and bladder 6 is removed. The calibration tube 1 is then turned back inside out so that the liner 4 lies inside the tube 1, or is fixed in position, see [reference]. Fig. 7 .

[0043] Optionally, the second end 3 of the hose 1 or the first end 2 can then be closed, for example with a knot or a clamp, and a pulling device 10 can be attached to it, for example a wire, a chain or a rope, preferably a flat strap. Preferably, the second end 3 is knotted, and the pulling device 10 is then attached to this knot. However, this step is not essential for the invention and is used for installing the liner 4 into the pipe 20.

[0044] In Fig. 8The diagram schematically illustrates how the liner 4 can be attached inside the pipe 20. How the hose 1 is inserted into the pipe 20 is described in detail, for example, in DE 44 26 151 A1. The hose 1 can, for example, be inverted (i.e., turned inside out) inside the pipe 20 using an inversion machine 11, so that the liner 4 is positioned on the outside 13 of the hose 1 and inside the pipe 20 at the correct location to be rehabilitated. The hose 1 can be pressurized by pumping air or a fluid into its interior.

[0045] The adhesive, which is located in the liner 4, is now allowed to cure. Curing can be accelerated by introducing heat, preferably steam, into the interior of the tube. Temperatures of preferably up to 80°C, and particularly up to 110°C, can be used.

[0046] After the resin mixture has hardened, the liner 4 is bonded to the inner wall of the tube 20. By moving the pulling device 10 along the tube 1 towards its second end 3, in the direction of the inversion machine 11, the calibration tube 1 can be removed from the tube 20.

[0047] Naturally, the invention is not limited to the embodiment shown and described. The liner 4 can be impregnated with the resin at different times. Reference symbol list

[0048] 1 Hose / Calibration hose 2 First end of hose 3 Second end of hose 4 Liner 5 Marker 6 Bladder 7 Fastener 8 Applicator 9 Connection surface 10 Pulling device 11 Inversion machine 12 Inversion point 13 Outside of hose 20 Tube

Claims

1. A process for fastening a liner (4) to a hose (1), in particular a calibration hose, comprising: - providing the hose (1) having a first end (2) and an opposite second end (3); - applying a marking (5) to the hose (1); - inverting the hose (1) by turning the first end (2) over the outer side (13) of the hose (1) in the direction of the second end (3), or vice versa, up to the marking (5), so that a point of inversion (12) is formed; - inserting the liner (4) into the hose (1) and positioning the liner at the point of inversion (12) of the hose (1); - inserting a bladder (6) into the liner (4) in the region of the point of inversion (12) and expanding the bladder (6); - inserting a fastening means (7) at the point of inversion (12) between the liner (4) and the hose (1), such that the liner (4) is retained on the hose (1); and - removing the bladder (6) and reverting the hose (1) to its original position.

2. The process according to claim 1, characterized in that the region to be rehabilitated in a pipe (20) is determined, and this is used to determine the marking (5) on the hose (1).

3. The process according to claim 1 or 2, characterized in that the fastening means is an adhesive, preferably a cyanoacrylate adhesive.

4. The process according to any one of the preceding claims, characterized in that the bladder (6) is only expanded to such an extent that the fastening means (7) can be introduced at the point of inversion (12) between the liner (4) and the hose (1), and / or that the bladder (6) is further expanded after the fastening means (7) has been introduced at the point of inversion (12) between the liner (4) and the hose (1).

5. The process according to any one of the preceding claims, characterized in that the bladder (6) is removed after the fastening means (7) has built up sufficient strength to retain the liner (4) on the hose (1).

6. The process according to any one of the preceding claims, characterized in that the liner (4) protrudes from the point of inversion (12), preferably by 0.5 cm to 5 cm, particularly preferably by approx. 1 cm to 2 cm, particularly by approx. 1 cm.

7. The process according to any one of the preceding claims, characterized in that the hose (1) is inverted, in particular turned inside out, into a pipe (20) so that the liner (4) comes to rest in the pipe (20).

8. The process according to claim 7, characterized in that the liner (4) is inserted into the pipe (20) by means of an inversion machine.

9. The process according to claim 7 or 8, characterized in that the hose (1) is removed after the liner (4) has been fastened in the pipe (20).

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