Method for securing a liner to a hose

Abstract

The invention relates to a method for attaching a liner (4) to a hose (1), in particular a calibration hose, comprising: - providing the hose (1) with a first end (2) and an opposite second end (3); - applying a mark (5) to the hose (1); - turning the hose (1) inside out by turning the first end (2) over the outside (13) of the hose (1) towards the second end (3) or vice versa up to the mark (5), so that an inversion point (12) is formed; - inserting the liner (4) into the hose (1) and arranging the liner (4) at the inversion point (12) of the hose (1); - inserting a bladder (6) into the liner (4) in the region of the inversion point (12) and expanding the bladder (6); - Inserting a fastening device (7) at the inversion point (12) between the liner (4) and the hose (1) so that the liner (4) is held on the hose (1);and - removing the bladder (6) and turning the tube (1) inside out into its original position.;

Description

[0001] The invention relates to a method for attaching a liner to a hose, in particular to a calibration hose, as well as the corresponding liner attached to the hose.

[0002] DE 44 26 151 A1 describes the lining of a pipe with a liner to rehabilitate the pipe in question. A so-called liner, a flexible fiber tube, is inserted into the pipe, for example, a pipeline or sewer. The fiber tube is impregnated with hardenable resin and 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 inversion and are cured by heat, UV radiation or ambient temperature.

[0004] The lining of the aforementioned type is designed in such a way that the resin-impregnated fiber hose, together with an auxiliary hose called the calibration hose, is inverted (turned inside out or turned inside out) into a pipe section to be renovated, and that after the resin-impregnated fiber hose has cured, the calibration hose is removed by retraction (reverse inversion process) and the fully formed and cured lining is applied over the correspondingly selected length and cross-section of the pipe.

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

[0006] The invention is therefore based on the object of providing an improved alternative method for attaching a liner to a hose and for lining, in particular renovating, a pipe. Furthermore, the invention is based on the object of providing a liner.

[0007] According to the invention, this object is achieved with regard to the method by the subject matter of claim 1. With regard to the liner, the above-mentioned object is achieved by the subject matter of claim 10.

[0008] Specifically, the object is achieved by a method for attaching a liner to a hose, in particular a calibration hose, wherein in the method a tube having a first end and an opposite second end is provided; a marker is applied to the tube; the first end is everted over the outside of the tube towards the second end or vice versa up to the marker in such a way that an everting point is created; a liner is introduced into the tube and arranged at the everting point; a bladder is arranged in the liner in the region of the everting point and expanded; a fastening means is introduced at the everting point between the liner and the tube in such a way that the liner is held to the tube; and the bladder is removed and the tube is everted back to its original position.

[0009] A further significant advantage of the invention is that the liner is pre-positioned in the hose before being inserted into a pipe to be repaired and is connected to the hose via the fastening means. This is achieved by inserting the fastening means between the liner and the hose at the inversion point of the hose. Once the liner is pre-positioned and held to the hose by the fastening means, the bladder is withdrawn, and the hose section that has been folded over the outside of the hose is folded back into place. In this state, the liner is preferably completely enclosed within the hose.

[0010] When folded back, the hose returns to its original position. The original position corresponds to the state, in particular the initial state, of the hose before and / or after one of its ends has been turned inside out. In its original position, the hose is preferably free of any inversion of the first and / or second end.

[0011] In pipe lining, the liner is inserted into the pipe to be lined by inverting or turning the hose inside out and placing it in the appropriate location. The method according to the invention therefore has the advantage that special packers, such as 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. Furthermore, costs are saved.

[0012] To form the inversion point, the first end of the tube is folded over its outer side toward the second end until the mark is reached. Alternatively, the tube can be folded in the opposite direction to form the inversion point, namely by folding the second end over the outer side of the tube toward the first end until the mark is reached. In any case, this corresponds to the inversion state of the tube.

[0013] Advantageous embodiments of the invention emerge from the dependent patent claims.

[0014] In a preferred embodiment, the area to be rehabilitated in a pipe is identified, and this information is used to determine the marking on the hose. In other words, the required distance of the marking from at least one of the ends of the hose is determined by pre-detecting the position of the area to be rehabilitated in the pipe, particularly using a camera. This enables simplified, precise placement of the liner at the desired location in the pipe to be rehabilitated.

[0015] An adhesive, particularly preferably a cyanoacrylate adhesive, is preferably used as the fastening means. The cyanoacrylate adhesive can be a so-called superglue. The adhesive advantageously connects the liner to the hose in such a way that the liner is held to the hose, particularly when inverted into a pipe, and / or is detached from the hose when the hose is removed from a pipe.

[0016] In a further preferred embodiment, the bladder is expanded only to the extent that the fastening means can be inserted at the inversion point between the liner and the hose. In other words, the bladder is radially expanded to the extent that the liner is held against the hose and the fastening means can still be attached, 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 means can still reach, in particular flow in, between the liner and the hose at the inversion point. This facilitates the insertion of the fastening means.

[0017] Additionally or alternatively, after the fastener is inserted, the bladder is further expanded at the inversion point between the liner and the tube. This promotes the formation of a strong bond between the liner and the tube.

[0018] Preferably, the bubble is removed once the fastener has developed sufficient strength to hold the liner to the hose. This is advantageous because the bubble remains in the liner only as long as necessary, saving time. For example, if an adhesive is used as the fastener, the adhesive may be partially or fully cured when the bubble is removed.

[0019] It is particularly advantageous if the liner protrudes slightly beyond the tube at the inversion point, as this simplifies the insertion of the fastening device. Preferably, the liner protrudes 0.5 cm to 5 cm, particularly preferably approximately 1 cm to 2 cm, and especially approximately 1 cm, beyond the tube at the inversion point.

[0020] In one embodiment, the hose is inverted, particularly folded, into a pipe in such a way that the liner is positioned or placed within the pipe. The liner is preferably inserted into the pipe using an inversion machine. The liner is preferably a resin-impregnated, flexible fiber hose. The liner is particularly preferably cured using heat, UV radiation, and / or ambient temperature.

[0021] Once the liner is secured or positioned in the pipe, the hose is removed from the pipe. Preferably, only the liner remains in the area of ​​the pipe to be repaired.

[0022] According to a subordinate aspect, a liner is disclosed and claimed which has been fastened in a hose according to the method of the invention.

[0023] In the following, exemplary embodiments of the invention are explained in more detail with reference to the drawings. Functionally identical elements are provided with the same reference numerals in the various figures.

[0024] It shows 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 installed position in a pipe.

[0025] Only the elements essential for a direct understanding of the invention are shown.

[0026] Fig. 1 to 7 show various steps of a method according to the invention for attaching a liner 4 in a hose 1 and Fig. 8 the attachment and positioning of the liner 4 in a pipe 20.

[0027] Fig. 1shows 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 be bent 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.

[0028] The calibration hose 1 is preferably transparent and made of a polyvinyl chloride material, in particular PVC. The calibration hose 1 is preferably usable up to a maximum of 50°C and, for example, can be used in a double-reinforced version up to 100°C. Furthermore, the calibration hose 1 can withstand a maximum load of 0.5 bar and has a basis weight of 400g / m². It should be noted that the calibration hose 1 is not limited to the above values. Other calibration hoses 1 can also be used alternatively within the scope of the invention.

[0029] In a pipe 20, for example a pipeline or a sewer, a certain section of the pipe 20 is to be renovated by means of a liner 4. Such liners 4 are preferably made of a woven or nonwoven fabric or a fleece and are preferably elastic. The liner 4 preferably consists of a longitudinally and transversely elastic textile hose, in particular a fabric hose. The textile hose is preferably made of polyethylene terephthalate, in particular PET. The textile hose is preferably laminated, in particular sheathed, with a film hose. The textile hose and / or the film hose are seamless. Furthermore, the textile hose and the film hose are bendable up to 90°, i.e. they can bend up to 90°.

[0030] The liner 4 can be or be provided with an adhesive, in particular with a curable synthetic resin mixture, particularly preferably a curable epoxy resin mixture.

[0031] The curable synthetic resin mixture is preferably a hobbock two-component epoxy resin system comprising a resin component, in particular EP 50 A resin, and a hardener component, in particular EP 50 B hardener, and enriched with fillers (dixotropic). It is therefore advantageous if the curable synthetic resin mixture is a solvent-free epoxy resin system that exhibits improved adhesion properties with respect to common sewer pipe materials and wet substrates, especially wet surfaces.

[0032] The liner 4 is impregnated with the resin immediately before being inverted into the pipe 20 and rolled to the appropriate thickness.

[0033] By measuring the pipe 20, particularly 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 marking 5 is applied to the calibration hose 1, preferably using a waterproof felt-tip pen, at the point where one end of the liner 4 must be positioned in the pipe 20 and thus on 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 determines where the liner 4 must be positioned on the calibration hose 1 and where it must be attached.

[0034] According to Fig. 2 Now the first end 2 of the hose 1 is turned inside out towards the second end 3 until the hose 1 is turned inside out up to the marking 5 on the calibration hose 1 and a turning point 12 is formed at the marking 5. After that, according to Fig. 3The liner 4 is drawn into the inverted hose 1 and arranged at the inversion point 12 such that it will later lie with the appropriate tolerances at the point in the pipe 20 to be repaired. The liner 4 can be inserted from the second end 3 or from the inversion point 12 at the end position 5 toward the second end 3. The liner 4 is then preferably arranged such that it protrudes slightly from the inverted hose 1, preferably approximately 0.5 cm to 5 cm, particularly preferably 1 cm to 2 cm, in particular approximately 1 cm beyond the inversion point 12.

[0035] According to the Fig. 4 and 5 An expandable bladder 6 is then inserted, at least partially, preferably mostly, into the liner 4 and the tube 1. Any object that can be expanded can be used as the expandable bladder 6, preferably a balloon-like object that can be inflated using compressed air.

[0036] The bladder 6 is now expanded, preferably inflated, to such an extent that the liner 4 can no longer shift relative to the calibration hose 1, but only to such an extent that it is possible to insert a fastening means 7 between the liner 4 and the hose 1 at the inversion point 12. The fastening means 7 is preferably inserted using an applicator 8, preferably with a conical nose. The fastening means 7 is preferably an adhesive. A commercially available adhesive suitable for the materials to be bonded can be used as the adhesive, 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 fastening means 7 other than adhesives.

[0037] The fastening means 7 is then bonded at least at two points, but preferably over at least 50 percent of the liner circumference, particularly preferably over 80 percent of the liner circumference, in particular continuously over the entire liner circumference. The width of the connecting surface 9 thus created by the fastening means 7 is preferably between 0.1 mm and 2 cm, particularly preferably between 1 mm and 1 cm.

[0038] The bladder 6 can then preferably be further inflated so that the liner 4 fits tightly against the calibration hose 1 and is securely fastened. Preferably, the bladder 6 is inflated to 1.5 bar, particularly 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 hose 1 being radially expanded by the bladder 6.

[0039] The process then waits until the fastening means 7 holds the liner 4 to the hose 1 with sufficient strength. Preferably, with an adhesive, it is waited until sufficient curing is achieved, particularly preferably until the adhesive is almost completely cured. When using a conventional cyanoacrylate adhesive, it is waited for approximately 30 minutes to ensure that the liner 4 adheres sufficiently 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.

[0040] Then the pressure is released from the bladder 6, preferably as slowly as possible, and the bladder 6 is removed. The calibration tube 1 is then turned back so that the liner 4 lies inside the tube 1, or is fixed in position, see Fig. 7 .

[0041] 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 traction device 10 can be attached thereto, for example a wire, a chain, or a rope, preferably a flat band. Preferably, the second end 3 is knotted, with the traction device 10 then being attached to this knot. However, this step is not mandatory for the invention and is used for installing the liner 4 into the pipe 20.

[0042] In Fig. 8is a schematic representation of how the liner 4 can be secured in 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 be inverted, i.e., turned inside out, into the pipe 20, for example, using an inversion machine 11, so that the liner 4 lies on the outer side 13 of the hose 1 and in the pipe 20 at the correct location to be repaired. The hose 1 can be pressurized by pumping air or a fluid into the interior of the hose 1.

[0043] The adhesive, which is arranged in the liner 4, is then allowed to cure. Curing can be accelerated by introducing heat, preferably by introducing steam, into the interior of the hose. Temperatures of preferably up to 80°C, in particular up to 110°C, can be used.

[0044] After the synthetic resin mixture has cured, the liner 4 is bonded to the inner wall of the tube 20. By moving the pulling device 10 along the tube 1 toward its second end 3, toward the inversion machine 11, the calibration tube 1 can be removed from the tube 20.

[0045] Of course, the invention is not limited to the embodiment shown and described. The liner 4 can be impregnated with the resin at various times. List of reference symbols

[0046] 1Hose / Calibration hose 2First end of the hose 3Second end of the hose 4Liner 5Marker 6Bladder 7Fastener 8Applicator 9Connection surface 10Pulling device 11Inversion machine 12Eversion point 13Outside of the hose 20Tube

Claims

1. A method for attaching a liner (4) to a hose (1), in particular a calibration hose, comprising: - providing the hose (1) with a first end (2) and an opposite second end (3); - applying a marking (5) to the hose (1); - everting the hose (1) by everting 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 an everting point (12) is created; - introducing the liner (4) into the hose (1) and arranging the liner at the everting point (12) of the hose (1); - introducing a bubble (6) into the liner (4) in the region of the everting point (12) and expanding the bubble (6); - introducing a fastening means (7) at the inversion point (12) between the liner (4) and the hose (1) so that the liner (4) is held on the hose (1);and - removing the bladder (6) and returning the tube (1) to its original position; 2. Method according to claim 1, characterized in that the area to be rehabilitated in a pipe (20) is determined and this is used to determine the marking (5) on the hose (1).

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

4. Method according to 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 inversion point (12) between the liner (4) and the hose (1), and / or that after the fastening means (7) has been introduced at the inversion point (12) between the liner (4) and the hose (1), the bladder (6) is expanded further.

5. Method according to one of the preceding claims, characterized in thatthe bladder (6) is removed after the fastening means (7) has built up sufficient strength to hold the liner (4) to the hose (1).

6. Method according to one of the preceding claims, characterized in that the liner (4) protrudes from the inversion point (12), preferably 0.5 cm to 5 cm, particularly preferably about 1 cm to 2 cm, in particular about 1 cm.

7. Method according to one of the preceding claims, characterized in that the hose (1) is inverted, in particular turned over, into a pipe (20) so that the liner (4) comes to lie in the pipe (20).

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

9. Method according to claim 7 or 8, characterized in that after fastening the liner (4) in the pipe (20) the hose (1) is removed.

10. Liner (4), fixed in a tube (1), characterized in thatthe liner (4) according to one of claims 1 to 6 has been attached to the hose (1).