Lining tube for the rehabilitation of defective sewer shafts, including berms and channels, and method for producing such a tube and method for lining a defective sewer shaft

Description

[0001] The invention relates to a lining hose for the rehabilitation of defective sewer shafts, including berms and channels, as well as a method for producing such a hose and for lining a defective sewer shaft according to the preamble of claims 1, 7 and 10.

[0002] In the field of trenchless rehabilitation of defective pipes, such as defective sewers, lining tubes are increasingly being used. These consist of one or more layers of a glass fiber laminate impregnated with a liquid reactive resin, which is arranged in the form of overlapping wound or laid fiber bands around an inner film tube. On the outside, the laminate is surrounded by an outer film tube, which prevents harmful substances, particularly styrene, from the reactive resin from escaping into the soil. The lining tubes, which are also known as inliners, are pulled into a sewer to be rehabilitated. After being pulled in, their ends are closed with packers, expanded using compressed air and cured using light from a UV radiation source, or alternatively by the introduction of hot steam.

[0003] A previously mentioned lining hose and a method for producing such a hose are known, for example, from WO-A 95 / 04646.

[0004] Sewer shafts must be renovated in the same way as pipelines. It is advisable to use the same methods for this. However, sewer shafts have the special feature compared to pipelines such as sewage pipes in that they run vertically and their diameter is not constant. Sewer shafts, or shaft structures in general, usually have a shorter upper section that extends vertically downwards from the upper shaft opening, an adjoining conical transition section and, adjoining the conical transition section, a longer lower, usually cylindrical section with a large diameter that extends down to the bottom of the shaft. The lower cylindrical shaft section has a diameter of 1,000 mm, for example, and tapers beyond the conical transition section to a diameter of 600 mm in the area of the upper opening.Since sewer shafts or shaft structures in general are not subject to any standard, there are a multitude of different designs that differ in their length, diameter and cone shape.

[0005] The same technology has long been used for the rehabilitation of sewer manholes as for the rehabilitation of the previously described pipelines and sewers. Although the vertical alignment of the sewer manholes is less problematic for the use of a previously described pipe lining tube, the difficulty during installation is that the diameter difference between the upper and lower sewer sections is very large and cannot be accommodated by conventional liners, which allow a maximum expansion of up to 10% of the base diameter, without the risk of overstretching and thus damaging the sensitive inner film tube and the fiberglass tape winding.

[0006] In this context, WO 2013 / 139892 A1 discloses winding lining tubes for the rehabilitation of sewer manholes on a winding mandrel of finite length, which is a positive shape of the manhole structure with a conical transition section. Although the lining tubes manufactured in this way allow the rehabilitation of sewer manholes with comparatively large diameter changes of more than 50%, they have the disadvantage that a separate winding mandrel must be manufactured for each design, which significantly increases production costs.

[0007] Although such a manhole lining tube makes it possible to rehabilitate both the cylindrical and conical sections of a manhole, complete rehabilitation of a manhole usually also requires lining the so-called berm and the channel of the manhole. This is usually done manually in additional steps, e.g., using molded parts or liquid coatings, which is very labor-intensive and results in correspondingly high costs.

[0008] Accordingly, it is an object of the present invention to provide a lining hose which makes it possible to rehabilitate sewer shafts with different inner diameters, including the berm and the channel, with one and the same lining hose.

[0009] This object is achieved according to the invention by a lining hose having the features of claim 1.

[0010] A further object of the invention is to provide a method by which such a lining hose can be manufactured.

[0011] This object is achieved according to the invention by a method having the features of claim 7.

[0012] A further object of the invention is to provide a method by which such a lining hose can be installed in a defective sewer shaft.

[0013] This object is achieved according to the invention by a method having the features of claim 10.

[0014] Further features of the invention are described in the subclaims.

[0015] According to the concept underlying the invention, a cylindrical lining tube with a circular cross-section is designed so that it can adapt to the different diameters of a sewer shaft upon expansion. This makes it possible to manufacture the lining tube as a continuous tube, as described in WO-A 95 / 04646, so that the user can divide it on-site into several individual tube sections, each of which has a length corresponding to the depth of the sewer shaft to be rehabilitated.

[0016] For this purpose, the lining hose comprises, in the same way as a lining hose for the rehabilitation of conventional horizontally running sewers and pipelines, an inner film hose on which at least one layer of a helically wound or alternatively circumferentially laid fiber tape, in particular a glass fiber tape or glass fiber fleece, is arranged. This is impregnated with a liquid reaction resin that can be cured by UV light. This is preferably followed by a longitudinally oriented glass fiber tape (longitudinal tensile tape), which dissipates the tensile forces during installation of the lining hose, also referred to below as the "liner," into a sewer shaft.

[0017] An outer film tube is preferably arranged around the circumferentially closed layer formed by the resin-impregnated fiber tape. This outer film tube can have a nonwoven layer facing the layer of fiber material, which is laminated to a plastic film used to form the outer film tube. A tear-resistant, preferably fabric-reinforced protective film is preferably arranged around the outer film tube, which is preferably made of a multi-layer film with a styrene barrier, in particular a PE-PA-PE film, to whose inner PE layer the nonwoven layer is laminated by a melting process. This protective film has a structure and material properties like a truck tarpaulin or a tear-resistant packaging film, and whose longitudinal edges are connected over the length of the lining tube, e.g. by adhesive tape or a welded or glued-on elastic film section.This elastic film section, which can also be formed by a strip of adhesive tape of an appropriate width, is split open like a predetermined breaking point when the lining tube expands, thus allowing radial expansion of the otherwise tear-resistant and virtually inextensible outer protective tube to the respective inner diameter of the sewer shaft. However, the predetermined breaking point can also be introduced in another form, e.g., as a perforation, into the protective tube, which is formed by overlapping one, two, or more film strips by edge bonding or welding, and which is also referred to below as the additional outer film tube.

[0018] The inner film tube has a connecting section extending in the longitudinal direction thereof, which connects two mutually parallel circumferential sections of the inner film tube to form a circumferentially closed inner film tube with a defined nominal diameter DN, which preferably corresponds to the diameter of the upper first shaft section. According to the invention, the connecting section comprises a predetermined breaking point extending along the inner film tube, which can be severed in the circumferential direction by introducing a pressure medium, in particular compressed air, so that the inner film tube and the layer of fiber material arranged thereon can expand radially beyond the nominal diameter of the unopened inner film tube, which essentially corresponds to the diameter of the first upper, smaller shaft section, by more than 10%, preferably more than 30%, up to the larger diameter of the second, lower shaft section.This results in the advantage that the circumferentially closed inner film tube with the unopened predetermined breaking point can serve as a base tube during the production of the lining tube on a winding machine, around which fiber ribbons are wound, and which has a well-defined nominal diameter DN and protects the winding mandrel of the winding machine from direct contact with the resin-impregnated fiber material.

[0019] This inner film tube, which allows for considerable laminate stretch, is thus the first layer around which the layer of fiber material is wound endlessly in the preferred embodiment in a known manner over an internal winding mandrel. This allows the lining tube to be advantageously manufactured, packaged, and delivered to the construction site using conventional methods.

[0020] In contrast to a known wound lining hose, which is used for the rehabilitation of horizontally running channels and pipelines with a substantially constant diameter, the layer of fiber material arranged in a tubular manner around the inner film hose in the lining hose according to the invention is formed from an overlapping wound fiber band, which allows a significantly higher longitudinal expansion compared to fiber bands used in conventional lining hoses.This increased longitudinal elongation, which in the longitudinal direction can be at least 10%, but preferably more than 30% or even 50% based on the length of the unstretched fiber band, enables the glass fiber bands of the wound fiber layer to expand more in the radial direction, so that the layer of fiber material can expand its diameter in the radial direction to the respective diameter of the second shaft section in order to adhere to the inner wall of the expanded shaft section.

[0021] Producing such a fiberglass tape with high longitudinal elongation is known in the art. When winding or laying the resin-impregnated fiber tapes of the lining hose according to the invention, it is taken into account that the wall thickness of the laminate decreases accordingly due to the high radial elongation. Therefore, the material thickness of the helically wound fiber tapes is increased by a corresponding amount to produce the layer of fiber material with a corresponding oversize, which ensures the required strength in the finished product after expansion and curing.

[0022] The high extensibility of the fiber band(s) used in the layer of fiber material is also advantageous in alternative embodiments of the lining tubes according to the invention, in which the layer of fiber material is not wound but is laid as a mat overlapping around the inner film tube with the predetermined breaking point formed thereon.

[0023] The lining tube according to the invention is characterized in that the radially expandable layer of fiber material is closed at a first end of the lining tube, which can be inserted into the channel of a sewer, by a seam extending orthogonally to the longitudinal axis of the lining tube. This transverse seam is preferably obtained by laying the lining tube flat and sewing its ends from the outside with a suitable suture material, e.g., a plastic thread, so that the end of the lining tube that is inserted first into the sewer shaft is closed by the transverse seam.

[0024] As already mentioned, an outer film tube is preferably arranged around the layer of fiber material. This outer film tube has a first longitudinal slit originating at a first end of the seam and a second longitudinal slit originating at the second end of the seam, which preferably extend parallel to the central longitudinal axis of the lining tube. Although the two longitudinal slits can also be introduced into the outer film tube after the first end of the layer of fiber tape has been sewn, the slits are preferably introduced before the seam is applied, e.g., using a knife or scissors.

[0025] This opens up the possibility that, according to a further embodiment of the invention, a lubricant, preferably silicone oil, can be applied between the inner layer of the outer film tube and the outer side of the layer of fiber material stretched between the first and second longitudinal slit in order to reduce the friction between the inner layer of the outer film tube and the fiber material. As the applicant has recognized, this surprisingly prevents wrinkles in the transition areas between the channel wall and the berm and / or the berm and the channel when the lining tube is expanded by means of introduced compressed air. These wrinkles would otherwise arise without such a lubricant when the highly extensible fiber material resting with the seam on the bottom of the channel is stretched according to the shape of the channel and the berm and adapts to their shape.As the applicant was also able to recognise, the reduction of wrinkles in the transition areas mentioned in the bottom of a manhole when expanding the lining tube is further assisted not only by the lubricant but also by the high extensibility of the fibre material used, preferably of more than 30%.

[0026] In order to enable the fibre material to be applied to the inner wall of the channel and the berm as smoothly as possible, the first longitudinal slot and the second longitudinal slot preferably each have a length that essentially corresponds to the width of the berm plus half the development of the inner wall surface of the channel.

[0027] As further recognized by the applicant, when using an outer film hose, it must also expand radially more than a conventional lining hose. This can be achieved either by generally more stretchable films or by a predetermined expansion joint, as described, for example, in the German patent application (DE 10 2011 103 001 A1). Alternatively, it is possible to generally weld the outer film hose, which is welded from two flat films to form a hose after the fiber ribbons have been wound / laid and the longitudinal tension band has been applied, somewhat wider, i.e. with a larger diameter that exceeds the diameter of the first channel section with a small inner diameter. For this purpose, for example, the flat film from which this hose is thermally welded can be selected to be so wide that its flat width corresponds in total to the circumference of the second shaft section with the enlarged inner diameter.To ensure that this outer film tube, which is welded with an additional oversize of e.g. 50%, is easy to handle during transport to the construction site and when pulling into a sewer shaft, the flat films are preferably folded lengthwise and releasably fixed to one another with adhesive tape.

[0028] To ensure that the tubular inner film of the inner film tube, around which the fiber material (laminate) is wound or laid, remains airtight throughout the entire expansion process, in which the inner film tube and the layer of fiber material arranged on it are expanded to the desired diameter by means of compressed air introduced into the sewer shaft, as well as during the subsequent curing with UV light, an additional inner film tube is arranged in the interior of the inner film tube according to the invention. This can, for example, be drawn into the inner film tube right from the start during the production of the lining tube if it is manufactured on a winding mandrel, as described in the above-mentioned WO-A 95 / 04646.Preferably, however, the additional inner film hose is only inserted into the lining hose on the construction site, which is possible with little effort in the case of lining hoses for lining sewer shafts due to the comparatively short lengths of only up to 6 m.

[0029] Although the lining tube can optionally be prefabricated during production in the factory, it is preferably assembled on site with the inner film tube featuring the predetermined breaking point. To do this, the lining tube is shortened to the required length according to the depth of the manhole to be renovated, and the transverse seam is inserted into the lower end of the layer of fiber material, which is assigned to the base of the manhole. This is preferably done by overlapping and overlapping the lower edge of the layer of fiber material. Before or after sewing the lower edge, the two longitudinal slits are inserted into the two longitudinal edges of the outer film tube. With the seam lying horizontally, the lining tube is preferably placed flat on a base.After the two longitudinal slits have been made in the outer film tube, the two film sections lying between them are folded over and the outside of the layer of fiber material is coated or sprayed with the aforementioned lubricant, and the folded-back sections are then folded back into their original position.

[0030] Subsequently, the additional inner film tube, which preferably consists of the same film as the inner film tube, is inserted into the lining tube.

[0031] The additional inner film tube, whose diameter corresponds at least to the enlarged diameter of the second shaft section, is closed at one end with a knot or cable tie, so that a film bag is created, which is preferably approx. 10 - 20% longer than the finished piece of the lining tube, which is to be inserted into the sewer shaft.

[0032] The lining tube, prepared to the desired shaft depth, is then sealed at its upper end with a known packer and lowered into the shaft structure by a crane until the second end, sealed by the seam, rests on the so-called berm, i.e., the transition between the cylindrical part of the sewer shaft and the so-called channel. The lining tube, suspended from the packer, is aligned by rotating the packer so that the transverse seam runs in the longitudinal direction of the channel. so that the seam lies completely in the channel and the fiber material arranged on both sides of the seam rests on the berm when the lining hose has been completely lowered into the sewer shaft.

[0033] The second inner film tube is then inserted through the packer from above into the lining tube, and a UV light source is suspended from above.

[0034] The lining tube is then sealed with the additional inner film tube (air bag), which has a significantly larger diameter than the first shaft section or the uncut inner film tube, using the packer. The interior of the air bag is pressurized with compressed air via an external compressed air source. This causes the additional inner film tube to expand and initially adhere to the glued or thermally welded inner film tube with the predetermined breaking point, whose diameter essentially corresponds to the diameter of the first, smaller shaft section.

[0035] If the pressure is further increased, the bond / weld seam (predetermined breaking point) of the inner film tube tears, so that it no longer offers any resistance to further expansion. This allows the layer of fiber material, which has a diameter essentially corresponding to the diameter of the first upper (smaller) shaft section, to expand further radially.

[0036] Since the diameter of the further inner film tube is equal to or preferably slightly larger than the diameter of the cylindrical lower section of the sewer shaft, the further inner film tube experiences no stretching in either the upper first shaft section or the lower second shaft section, so that this further inner film tube (air bag) can rest tension-free on the inner wall of the inner film tube closed along the predetermined breaking point in the first shaft section and on the inner wall of the layer of fiber material in the second enlarged shaft section - as well as in the conical transition section connecting the two shaft sections - after the predetermined breaking point of the inner film tube has burst.This advantageously ensures that the further inner film tube remains airtight overall and, despite the open sol-break point in the inner film tube, no compressed air can escape through the layer of resin-impregnated fiber material, which would lead to blowing out of reaction resin and a concomitant weakening of the cured laminate.

[0037] By expanding the additional inner film tube (air bag), the fiber material resting on the channel and the berm is also expanded in the area around the transverse seam and pressed against the surfaces of the berm and the channel visible from above. In this context, the applicant observed that the sections of the fiber material layer coated with the lubricant adhere to the surfaces of the berm(s) and the channel almost wrinkle-free when the lining tube is fully expanded due to the reduced friction and the increased extensibility of the fiber material, preferably more than 30%, as well as the expansion of the film material of the additional inner film tube.

[0038] As the applicant has further recognised, the additional inner film hose is essential for the rehabilitation of sewer shafts, since, in contrast to conventional lining hoses for the rehabilitation of horizontally running sewers and pipelines, no second packer can be used to close the lining hose in the lower shaft section.

[0039] In this context, it has proven particularly advantageous that by using the previously described embodiment of the method according to the invention, the berm and the channel of a sewer shaft can be lined in one and the same operation.

[0040] According to a further concept underlying the invention, which opens up the possibility of additionally securing the lining tube against buoyancy within the sewer shaft, retaining elements, in particular blocks and / or shortened crampons and / or grooves, are attached to the inner wall of the first and / or second shaft section before the lining tube, which is closed at its lower end by the seam, is inserted into the sewer shaft. After the lining tube has been completely lowered, these retaining elements are covered by the outer side of the outer film tube and the fiber material arranged therein, creating a local radial bulging of the fiber material when the further inner film tube is expanded and the layer of fiber material presses against the inner wall around the retaining elements, with convexly inwardly projecting retaining elements.In the case of depressions, such as holes that are made in the inner wall of the manhole in the area of the bottom of the manhole, the highly stretchable fiber material impregnated with liquid reaction resin is pressed locally into the respective depression by the additional lining hose, causing the layer of fiber material to bulge radially outwards into the depression.

[0041] After the reaction resin has hardened, these local bulges in the hardened fiber material form a positive connection that counteracts the buoyancy forces caused by groundwater penetrating the bottom of the brittle old sewer and trying to push the hardened lining tube, which is sealed against the groundwater, upwards.

[0042] In other words, the local radial bulges of the fiber material engage behind the retaining elements in the manhole, which are firmly connected to the wall of the manhole or formed in it, after the lining tube has expanded and hardened and fix it mechanically in the base of the manhole.

[0043] The invention is described below with reference to the drawings using preferred embodiments.

[0044] The drawings show: Fig. 1a schematic partially transparent plan view of a lining tube according to the invention before the insertion of the seam, Fig. 2aa schematic representation of a sewer shaft to be rehabilitated with indicated berm and channel before the insertion of a lining tube according to the invention, Fig. 2bthe sewer shaft of Fig. 2a after lowering the lining hose, Fig. 2c the manhole from Fig. 2a before inserting the further inner film tube into the lining tube, Fig. 2dthe sewer shaft of Fig. 2a after inserting the further inner film tube, Fig. 2, the sewer shaft of Fig. 2a after introducing a radiation source and expanding the lining tube and irradiating the inside of the layer of fiber material applied to the inner wall of the shaft sections of different widths, Fig. 3 is a schematic partial representation of a preferred embodiment of an inner film tube with a predetermined breaking point used in the lining tubes according to the invention, Fig. 4 is a schematic partial representation of a further embodiment of a seamless inner film tube used in the lining tubes according to the invention with a predetermined breaking point containing a film loop bridged by a film strip, Fig. 5 is a cross-sectional view of the lower first end of a lining tube according to the invention lowered into the channel to illustrate the orientation of the seam relative to the channel, and Fig.6A cross-sectional view of a manhole provided with additional convex and concave holding elements, with a cured lining tube according to the invention drawn into the manhole, which is secured against buoyancy by a positive connection between the holding elements and the cured fiber material.

[0045] As shown in the illustration by Fig. 1 shown comprises a lining tube 1 for the rehabilitation of a Fig. 2a illustrated defective sewer shaft 100, which has a first shaft section 110 with a first diameter and an adjoining second shaft section 120 with an enlarged diameter, an inner film tube 10 and a radially expandable layer of fiber material 20 arranged around the latter, which is impregnated with a curable reaction resin.

[0046] The inner film tube 10 has a connecting section 12 extending in the longitudinal direction thereof, which connects two parallel circumferential sections 10a, 10b of the inner film tube 10 to form a circumferentially closed inner film tube with a defined nominal diameter DN. The connecting section 12 comprises a predetermined breaking point 14 extending along the inner film tube 10, which can be opened by introducing a pressure medium, in particular compressed air, from a compressed gas source 6 ( Fig. 2e ) into the inner film tube 10 in the circumferential direction, so that the inner film tube 10 and the layer of fiber material 20 arranged thereon extend radially beyond the nominal diameter, which essentially corresponds to the diameter of the first upper smaller shaft section 110 ( Fig. 2a ), by more than 10%, preferably more than 30% and particularly preferably up to 50% up to the expanded diameter of the second lower shaft section 120. Thus, in practice, in a conventional sewer shaft 100 with a shaft depth of 2 to 5 m, the smaller diameter of the upper shaft section 110 can be, for example, 600 mm, and the diameter of the lower cylindrical second shaft section 120 can be, for example, 1000 mm, with a conical transition section being formed between the first and second shaft sections 110, 120.

[0047] In a preferred embodiment of the invention, at least one transparent flat film 16, formed, for example, by laying into a tube, is used to form the inner film tube 10, the longitudinal edges 17a, 17b of which, as shown in Fig. 1 shown, are spaced apart and are connected to each other by a transparent foil strip 18 glued or thermally welded to the outside. The predetermined breaking point 14 extends in this very cost-effectively manufactured, in Fig. 1 shown embodiment along one or both longitudinal weld seams or adhesive points, along which the transparent film strip 18 is connected to the corresponding peripheral sections 10a, 10b of the likewise transparent flat film 16 from which the inner film tube 10 is formed.

[0048] In another, in Fig. 3 In the embodiment of the invention shown, which is particularly cost-effective and easy to manufacture, the inner film tube 10 comprises at least one flat film 16 formed into a tube, the edge sections 16a, 16b of which are guided overlapping one above the other and, for example, by a Fig. 3 are connected to one another by an adhesive that is only indicated schematically, e.g. a double-sided adhesive tape, or by thermal welding. Alternatively, the edge sections 16a and 16b can also be connected to one another by a transparent adhesive tape. The two embodiments of the inner film tube according to the invention described above offer the advantage that a further circumferentially closed, preferably seamless inner film tube can be inserted into it, which is provided, for example, as a cost-effective endless roll product, before the two circumferential sections 10a, 10b are glued or welded to one another. In this embodiment, the resin-impregnated fiber bands of the layer of fiber material are laid in an overlapping manner around the glued / welded inner film tube in a particularly advantageous manner.In this case, the fiber ribbons are formed as individual mats with a length corresponding to the length of the lining hose to be produced. The width of the mats in this embodiment is slightly, e.g., 10%, larger than the inner circumference of the second enlarged shaft section 120, thereby ensuring that the layer of fiber material can expand to the second larger diameter by circumferentially shifting the overlapping longitudinal edges of the mat, while remaining completely closed circumferentially once the layer of fiber material has been applied to the second shaft section with a larger diameter.

[0049] In order to prevent compressed air from escaping through the seams, which are sometimes not completely closed, or through the open predetermined breaking point 14 in the area of the second shaft section 120 with an enlarged diameter in the previously described embodiments of the inner film tube 10 produced by overlapping gluing / welding a flat film 16, a further inner film tube 60 made of an airtight transparent plastic material is arranged within the welded / glued inner film tube 10, one end of which can be closed airtight by welding or by a sealing element 62, in particular a cord wound around the outside of the further inner film tube 60, or a cable tie, to form an air bag 64 closed on one side.Although the further inner film tube 60 can already be inserted into the inner film tube 10 during production at the factory, it is preferably only inserted into the interior of the inner film tube 10 on the construction site, in particular after the lining tube 1 has been inserted into the vertical sewer shaft 100, wherein the lower free end of the further inner film tube 60 is previously sealed airtight by welding or by a sealing element 62 to form the air bag 64 closed on one side.

[0050] According to a further alternative embodiment of the invention, the inner film tube 10 can be a circumferentially seamless film tube having a circular cross-section with a diameter that is more than 10%, preferably more than 40% of the nominal diameter of the first shaft section 110, and which preferably corresponds to the diameter of the second enlarged shaft section 120 of a sewer shaft 110 to be renovated. The two adjacent outer circumferential sections 10a, 10b of the seamless film tube 10 are in this Fig. 4 In the embodiment of the invention shown, the film loops 13 are connected in the region of the connecting section 12 by means of a glued or thermally welded transparent film strip 18, which spans and covers the film loop 13, forming a film loop 13 running in the circumferential direction of the inner film tube 10 and extending over the length of the inner film tube 10. This advantageously provides a connecting section with a predetermined breaking point 14, which in Fig. 4 along the first and second circumferential section 10a, 10b, for example in the area of the bonding point or weld seam, and which is schematically shown by the dashed lines in Fig. 4 When inserting and expanding the inner film tube 10 of the embodiment of Fig. 4 It does not matter whether the right or left weld seam / bond point in the illustration tears open when the lining tube 1 expands in the expanded second shaft section 120, since the inner film tube 10, which is completely closed in the circumferential direction, always ensures a closed air volume inside the lining tube 1, which reliably prevents the reaction resin from being blown out when it expands.

[0051] In order to ensure a sufficiently high circumferential extensibility of a layer of fiber material 20 obtained by overlapping helical winding, said layer comprises at least one helically overlapping wound fiber band, in particular a glass fiber band 22, whose fiber material has a longitudinal extensibility of more than 10% relative to the total length of the band. As discovered by the applicant, this large longitudinal elongation allows a correspondingly large radial expansion of the layer 20 produced from the helically overlapping wound fiber band by more than 10%, in particular more than 30%, up to 60%, without significant shrinkage occurring in the longitudinal direction of the lining tube 1.

[0052] As the representation of the Fig. 1 can also be removed, in the previously described embodiments of lining hoses 1, at least one longitudinal tension band 30 is preferably arranged on the layer of fiber material 20, which extends in the longitudinal direction of the lining hose 1. The longitudinal tension band 30 preferably comprises continuous glass fibers or glass fiber rovings, which preferably run over the entire length of the lining hose and which absorb the axial forces when the lining hose 1 is inserted, for example by means of a crane, into a defective sewer shaft 100 to be rehabilitated.

[0053] As the representation of the Figuren 2a bis 2e and 5can be removed, the radially expandable tubular layer of fiber material 20 is closed at a first end 70, which can be inserted into the channel 131 of the manhole 100 and is also referred to as the lower end, by a seam 72 which extends orthogonally to the longitudinal axis L of the tubular layer of fiber material 20. The seam 72 is in Fig. 5 only indicated schematically, and can, for example, have additional knots between the puncture points, with which the two sewn lower edge sections of the fiber material 22 are locally additionally secured against slipping and displacement in the region of the first end 70 of the layer of fiber material 22. The inner film tube is preferably still present in the seam area, but can also be removed locally around the seam 72.

[0054] An outer film tube 40 is preferably arranged around the tubular, radially expandable layer of fiber material 20. This outer film tube 40 has a diameter that is greater than or equal to the diameter of the further inner film tube / air bag 64 and preferably forms a barrier that prevents harmful substances, in particular styrene, from escaping from the reaction resin into the surrounding soil. The outer film tube 40 can also be surrounded by a further outer film tube 50 ( Fig. 1 ), which consists of a reinforced tensile-resistant material impermeable to UV light, in particular of a fabric-reinforced plastic film which is provided with a circumferentially stretchable section which, when the lining hose expands above a predetermined overpressure, for example 0.2 bar, bursts open in the second shaft section 120 similar to the predetermined breaking point 14 and allows a radial expansion of the layer of fiber material 20.

[0055] As shown in the representation of Fig. 5 As can be seen in detail, the outer film tube 40 comprises a first longitudinal slit 42a originating at a first end of the seam 72 and a second longitudinal slit 42b originating at the second end of the seam 72, which are advantageously introduced into the two lateral weld seams 41 before the lower edge of the layer of fiber material 20 is sewn, by means of which the outer film tube 40 is formed from two flat films made of a thermoplastic material laid around the layer of fiber material (2) and guided one above the other at the longitudinal edges in a known manner by thermal welding. The two longitudinal slits 42a, 42b can be obtained, for example, by separating or severing the lateral weld seams 41 and each have a length which preferably corresponds essentially to the width of the berm 130 plus half the development of the inner wall surface of the channel 131.If the berm, as in . Fig. 5 shown, consists of two individual lateral berms 130, the aforementioned sum corresponds to the sum of the width of the two individual berms 130.

[0056] In order to advantageously prevent the formation of wrinkles when expanding the lining tube 1 in the area of the channel 131 and the berms 130, it is provided in the preferred embodiment of the invention that a lubricant 80, preferably silicone oil, is applied between the inside of the outer film tube 40 and an outer section of the tubular layer of fiber material 20 stretched between the first and second longitudinal slits 42a, 42b, which lubricant 80 is preferably silicone oil in the illustration of the Fig. 5 is only schematically indicated by the wave-like short lines 80. If an additional outer film tube 50 is used, this is also cut open along the longitudinal slits 42a, 42b in order to be able to introduce the lubricant 80 and to facilitate the application of the fiber material of layer 20 in the area of the channel and the berms.

[0057] According to a further idea underlying the invention, a method for producing a previously described lining tube 1 is characterized by the following method steps: First, a UV-permeable plastic flat film 16 is formed into a circumferentially closed inner film tube 10 with a predetermined nominal diameter. This is advantageously achieved by overlapping gluing or welding the longitudinal edges 17a, 17b of the transparent plastic flat film 16 and / or by gluing or thermally welding a transparent film strip 18 onto two adjacent outer circumferential sections 10a, 10b of the tubular plastic flat film 16, which run parallel to one another. This creates a connecting section 12 which has a predetermined breaking point 14 running in the longitudinal direction of the inner film tube 10.On the outer side of the thus formed inner film tube 10 with predetermined breaking point 14, at least one circumferentially closed layer 20 of fiber material is arranged by overlapping or overlapping helically winding at least one resin-impregnated fiber tape 22, in particular a glass fiber tape. Winding is preferably carried out on a winding device, such as that described, for example, in WO-A 95 / 04646.

[0058] In a particularly advantageous embodiment of the method, a further transparent, circumferentially hermetically closed inner film tube 60 extending over the length of the lining tube 1 is inserted into the plastic flat film 16 before the plastic flat film 16 is formed into the circumferentially closed inner film tube 10 and the seam 72 is introduced into the first lower end 70 of the layer of fiber material 20 at the factory.

[0059] With the described lining hose 1 it is possible to line not only the cylindrical parts 110 and 120 and the conical part 115 of the sewer shaft 100, but it is also possible to line the transition between the second lower shaft section 120 and the channel 131, ie the so-called berm 130, without further steps, as shown in Fig. 6 is indicated.

[0060] The lining tube 1 manufactured in the manner described above and provided with the seam 72 at the factory is then transported to the construction site and installed there in a defective sewer shaft 100 to be rehabilitated, as shown in the illustrations of the Figuren 2a bis 2e is shown.

[0061] Here, one end of the lining hose 1 is first fastened, for example with a tensioning belt (not shown in more detail), to a known pot-shaped packer 200, which is held above the manhole 100 by a crane (not shown in more detail). The packer 200 with the lining hose 1 attached to it is then, as shown in Fig. 2a shown, positioned in a vertical position above the manhole 100, which has a first upper manhole section 110 with a smaller diameter, for example 600 mm, and an underlying second manhole section 120 with a larger diameter, for example 1000 mm.

[0062] Next, the packer 200 with the lining hose 1 attached to it is lowered into the manhole 100 until the lower end 70 of the lining hose 1, or the seam 72, rests on the bottom of the channel 131 of the manhole 100, which is installed in the same way as the berm 130 in Fig. 2b is only shown schematically by dotted lines.

[0063] Subsequently, a previously described further inner film tube 60, which has previously been closed on the bottom side, for example by a sealing element 62 or by knotting and forms an air bag 64 closed on one side, is introduced from above into the inner film tube 10 of the lining tube 1, as shown in the Figuren 2c and 2d is shown.

[0064] In a final process step, the packer 200 is closed on its upper side in a known manner by a cover (not further described), and the interior of the air bag 64 is pressurized in a known manner by introducing compressed air from a compressed air source 6 through the cover of the packer 200. As a result, the inner film tube 10, in the region of the first channel section 110, adheres to the inside of the layer of fiber material 20 and pushes it against the inside of the first shaft section 110, wherein the inner film tube 10 is closed along the predetermined breaking point 14.In the adjoining conical transition section 115 and the second shaft section 120, in which the channel shaft 100 has a larger diameter than the nominal diameter of the inner film tube 10, the predetermined breaking point 14 tears open due to the increasing pressure and allows the further inner film tube / air bag 64 to lie against the inside of the partially exposed layer 20 of fiber material 20 and expands it radially and presses it against the inner wall of the second shaft section 20.

[0065] Finally, the reaction resin in the layer of fiber material 20 is cured by introducing an unspecified UV radiation source into the interior of the air bag 64, while the fiber material is pressed against the inner wall of the sewer shaft 100 with high pressure by the overpressure in the further inner film tube 60 / air bag 64.

[0066] In the preferred embodiment of the invention, however, for lining the berms 130 and the channel 131, no factory-sewn lining tube 1 is used, but rather a conventionally manufactured lining tube 1 in the manner described above, open on both sides, which is transported to the construction site and prepared accordingly. However, before the lining tube 1 is attached to the packer 200 as described above and suspended from a crane, the outer film tube 40, which is preferably a packaging film made of a thermoplastic material welded lengthwise on both sides, is cut open at the first lower end 70 in an area whose length corresponds approximately to the width of the berm 130 plus approximately half the development of the channel 131, e.g. along the weld seams 41, as shown in Fig. 5 is indicated. The film is folded back so that the resin-impregnated fiber material of layer 20 is exposed. If present, a further outer film tube 50 surrounding the outer film tube 40 is also cut open in the same way at the level of the weld seams 41, and the flap-like areas of the tubes 40 and 50 are folded back. The inner sides of the layer of fiber tape 20 are then laid flat on top of one another and roughly sewn together along the seam 72. A lubricant 80, e.g. a silicone oil, is applied to the outer side of the exposed fiber tapes 22, and then the film of the outer film tube 40 and, if present, the further outer film tube 50 are folded back onto the outer side of the layer of fiber material 22 with the lubricant 80 applied to it.

[0067] The initially flat lining tube 1, which is sewn together at the bottom, is attached in this form with its other open end to the packer 150 ( Fig. 2a ) and suspended by means of the crane into the shaft structure 100 in such a way that it hangs down with its sewn-together end into the channel 131 and is aligned with the seam 72 along the channel 131 (see Fig. 5 ). Alignment along the channel 131 is particularly easy to implement with the lining hose 1 according to the invention, since the diameter of the lining hose 1 corresponds at most to the small, upper diameter 110 of the sewer shaft 100, thus making it possible to observe the exact position of the seam 72 during the insertion of the lining hose 1 into the sewer shaft 100. In contrast, lining hoses of the prior art, whose diameters are adapted to the different inner diameters of a particular sewer shaft 100, have a diameter that corresponds more closely to the diameter of the second enlarged shaft section 120, so that they must be folded together for insertion through the first shaft section with a reduced diameter 110.

[0068] The additional inner film tube 60, which is tightly sealed at the lower end, is then inserted into this prepared lining tube 1 and expanded with compressed air. When the lining tube 1 is expanded, it generally tends to assume a cylindrical shape, whereas the berms 130 and the channel 131 have a rather flat shape. Since the fiber material of layer 20, which is also referred to below as the laminate, can slide on the film material of the outer film tube 40 in the region of the first lower end 70 thanks to the lubricant 80, it is possible to convert the inherently cylindrical lining tube into a rather flat shape.As the applicant has recognized, this is only possible in particular because the fiber material of the lining tube 1, as previously mentioned, has a very high extensibility, which makes it possible, in the transition from a cylindrical region to a rather flat region, to press the fiber material essentially without creases onto the surfaces of the berms 130 and the channel 131 simply by inserting and expanding the air bag 64.

[0069] After the curing of the reaction resin, which is carried out in a known manner, preferably with the aid of UV light, which activates photoinitiators contained in the reaction resin, any parts of the cured lining tube 1 that may project into the channel 131 and the sewer pipe are then cut off in a final step.

[0070] After the defective manhole 100 including berm 130 and channel 131 has been rehabilitated, the rehabilitated manhole structure 150 forms a watertight cylinder closed at the bottom, as shown in Fig 6 is indicated. Through the Fig. 6 Due to the groundwater represented by the wavy lines, the cylinder closed at the bottom experiences buoyancy, which in the case of deep shaft structures 100 and high groundwater levels 160 leads to the resulting buoyancy forces becoming so great that they can no longer be carried away into the ground by the upper conical part 115 alone.

[0071] To counteract this, without the otherwise usual method of drilling a multitude of holes through the inner wall of the cured lining tube 1 into the rehabilitated shaft structure 150, into which screw-dowel connections are inserted to mechanically fix the cured lining tube 1 to the shaft structure, it is possible, when using a previously described lining tube 1 according to the invention, to additionally mechanically fix it with little effort and without subsequently inserting holes. As a result, the structure of the cured fiber composite material of the layer of fiber material 20 remains undamaged, ensuring that the rehabilitated and buoyancy-protected shaft structure 150 continues to meet the required tightness requirements even after years.

[0072] For this purpose, according to a further concept underlying the invention, a positive connection is created between the old shaft structure 100 and the cured layer of fiber material 20 of the lining tube 1 according to the invention. This has the advantage that the shrinkage that is generally unavoidable with synthetic resin laminates does not result in the associated reduction in the outer diameter of the cured lining tube 1 exerting an additional load on an adhesive connection between the lining tube 1 and the inner wall of the sewer shaft 100, which will be described in more detail below and which leads to the adhesive connection becoming more easily detached when buoyancy forces occur.

[0073] According to a first embodiment, prior to the renovation of the old shaft structure 100, a groove is chiseled or milled into the inner wall of the old shaft structure 100, either locally or circumferentially, provided such grooves do not already exist between the concrete rings of the shaft structure 100. Since the material of the lining tube 1 is highly stretchable and is pressed against the inner wall of the old shaft structure 100 by the internal pressure during expansion before curing, the laminate lies in the prepared and / or existing groove, so that a concave form fit is created after curing. The grooves introduced into the inner wall of the old shaft structure 100 form retaining elements 140, which create a concave bulge 302 in the layer of fiber material 20, which effects the mechanical form fit.

[0074] It is also conceivable, before the renovation of the old shaft structure 100, to prepare a convex form fit in places or all around via holding means 141, which are directed radially inwards from the inner wall of the old shaft structure 100 and, after the fiber material of the layer 20 has hardened, lead to a convex bulge 303 in the latter, as is the case with the lower holding element 141 in Fig. 6 is indicated.

[0075] For this purpose, either corresponding preformed parts are glued or screwed to the old sewer wall, or appropriately shaped nails with large heads are hammered between the individual concrete rings of the old shaft structure 100, which are directed inward from the inner wall of the old shaft structure 100 toward the center. It is also conceivable to design the retaining elements 141 as a circumferential or partial bead, which is formed using mortar or synthetic resin on the inner wall of the old shaft structure 100 and cured before the installation of the lining tube 1. It is also conceivable that remnants of old climbing irons, which otherwise always have to be removed before renovation, remain in the sewer shaft 100 and protrude into the shaft.In all of these previously described embodiments, the particularly stretchable fiber material of layer 20 of the lining hose 1 is laid over these convex holding elements 141 before the reaction resin hardens and forms convex bulges 303 which create the positive connection between the fiber material and the old shaft structure 100.

[0076] At the same time or alternatively, a Fig. 6 indicated, introduced in the lower region of the cylindrical part 120, can be provided in order to dissipate the buoyancy forces of the cured, outwardly sealed lining hose 1 alone or optionally in addition to other measures. For this purpose, a suitable adhesive, preferably epoxy resin or polyurethane adhesive, is applied to the inner wall of the lower second shaft section 120 before lowering the lining hose 1 into the sewer shaft 100. Depending on the adhesive, the outer film of the outer film hose 40 and, if present, also of the further outer film hose 50 may have to be removed. By expanding the lining hose 1 using compressed air, the adhesive is advantageously distributed into a relatively thin layer and, due to the applied pressure, is pressed into even the smallest roughness of the old shaft structure 100.Thus, the adhesive not only creates an adhesive bond, but also a form fit over the roughness of the inner wall of the old sewer shaft 100. Bezugszeichenliste

[0077] 1 Lining hose 6 Pressure gas source 10 Inner film hose 10a First circumferential section of the inner film hose 10b Second circumferential section of the inner film hose 12 Connecting section 13 Film loop 14 Predetermined breaking point 16 Flat film formed into a hose 16a Edge section 16b Edge section 17a Longitudinal edge 17b Longitudinal edge 18 Welded film strip 20 Radially expandable tubular layer of fiber material 22 Fiber band 30 Longitudinal tension band 40 Outer film hose 41 Lateral weld seam of the outer film hose 42a First longitudinal slit in outer film hose 42b Second longitudinal slit in outer film hose 50 Further outer film hose made of reinforced tensile material 60 Further inner film hose 62 Sealing element / cord 64 Air bag 70 First lower End of the layer of fiber material 72Seam 80Lubricant 100Sewer shaft 110First shaft section 115Conical part 120Second shaft section 130Berm 131Channel 140Concave retaining elements 141Convex retaining elements 150Rehabilitated shaft structure160Groundwater level 200Packer 301Gluing 302Concave bulge of the fiber material layer 303Convex bulge of the fiber material layer LLongitudinal axis of the lining tube

Claims

1. Lining tube (1) for restoring a defective sewer shaft (100), which has a first shaft portion (110) having a first diameter and an adjacent second shaft portion (120) having an expanded diameter and a berm and a channel, comprising an inner film tube (10) and a tubular layer, which is arranged around it and which can be radially expanded, of fibre material (20) and which is impregnated with a curable reaction resin, wherein the inner film tube (10) has a connection portion (12) which extends in the longitudinal direction thereof, and which connects two circumferential portions (10a), (10b) of the inner film tube (10) which extend parallel with each other to form a circumferentially closed inner film tube(10) having a defined nominal diameter, and the connection portion (12) has a desired breaking location (14) which extends along the inner film tube (10) and which can be separated by introducing a pressurized medium into the inner film tube in a circumferential direction in order to expand the inner film tube (10) and the layer of fibre material (20) which is arranged thereon radially over the nominal diameter, characterized in that the radially expandable tubular layer of fibre material (20) is closed at a first end (70) which can be introduced into the channel of the sewer shaft (100) by means of a seam (72) which extends orthogonally with respect to the longitudinal axis (L) of the tubular layer of fibre material (20).

2. Lining tube according to Claim 1, characterized in that around the layer of fibre material (20) there is arranged an outer film tube (40) which comprises a first longitudinal slot (42a) which rises at a first end of the seam (72) and a second longitudinal slot (42b) which rises at the second end of the seam (72), which preferably extend parallel with the longitudinal centre axis (L) of the tubular layer of fibre material (20).

3. Lining tube according to Claim 2, characterized in that the first longitudinal slot (42a) and the second longitudinal slot (42b) each have a length which preferably substantially corresponds to the width of the berm (130) plus half the developed view of the inner wall face of the channel (131).

4. Lining tube according to Claim 2 or 3, characterized in that between the inner side of the outer film tube (40) and an outer portion, which is defined between the first and second longitudinal slot (42a, 42b), of the tubular layer of fibre material (20), a lubricant (80), preferably silicone oil, is applied in order to reduce the friction between the inner side of the outer film tube (40) and the outer side of the tubular layer of fibre material (20) in order to prevent folds in the transition regions between the inner wall of the sewer shaft (100) and the berm (130) and / or the berm (130) and the channel (131) during expansion of the lining tube (1) by means of compressed air which is introduced.

5. Lining tube according to one of the preceding claims, characterized in that the tubular, radially expandable layer of fibre material (20) comprises at least one fibre tape (22) which is wound in a helically overlapping manner or at least one fibre tape (22) which extends in the longitudinal direction of the lining tube (1) and which is placed in an overlapping manner at the longitudinal edges thereof and the fibre material of which has an expandability of more than 10% so that the tubular layer (20) of fibre material by introducing a pressurized medium into the interior of the lining tube (1) can be radially increased from a first diameter to a second diameter, the size of which exceeds the size of the first diameter by at least 10%, in particular more than 30%.

6. Lining tube according to one of the preceding claims, characterized in that within the inner film tube (10) there is arranged an additional inner film tube (60) made of an air-tight transparent plastics material and which extends in the longitudinal direction of the lining tube (1) over the entire length thereof and one end of which can be closed in an air-tight manner by means of a sealing element (62), in particular a knot or a cord which is wound around the outer side of the additional inner film tube or a cable tie in order to form an air bag (64) which is closed at one side and which is arranged within the tubular layer of fibre material (20) which is closed by the seam (72) at the end side and which can be radially expanded.

7. Method for producing a lining tube (1) according to one of the preceding claims, characterized by the following method steps: shaping a transparent plastics material flat film (16) to form a circumferentially closed inner film tube (10) having a predetermined nominal diameter by means of overlapping adhesive bonding or welding of the longitudinal edges (17a, 17b) of the transparent plastics material flat film (16) and / or by adhesive bonding or thermally welding a transparent film strip (18) on two adjacent outer circumferential portions (10a), (10b) which extend parallel with each other of the plastics material flat film (16) which is arranged in a tubular manner with a connection portion (12) which has a desired breaking location (14) which extends in the longitudinal direction of the inner film tube (10) being produced, and arranging a radially expandable tubular layer of fibre material (20) on the outer side of the circumferentially closed tubular inner film tube (10) by means of overlapping helical winding or overlapping placement of at least one resin-impregnated fibre tape (22), in particular glass fibre tape around the inner film tube (10), and closing the first lower end (70) of the layer of fibre material (20) by means of a seam (72), which extends orthogonally with respect to the longitudinal axis (L) of the tubular, radially expandable layer of fibre material (20).

8. Method according to Claim 7, characterized by the additional method steps of: arranging an outer film tube (40) around the tubular, radially expandable layer of fibre material (20) and introducing a first longitudinal slot (42a) which rises at a first end of the seam (72) and a second longitudinal slot (42b) which rises at a second end of the seam (72) into the outer film tube (40) which preferably extend parallel with the longitudinal centre axis (L) of the tubular, radially expandable layer of fibre material (20).

9. Method according to Claim 7, characterized by the additional method step of: introducing lubricant (80) between the inner side of the outer film tube (40) and an outer portion, which is defined between the first and the second longitudinal slot (42a, 42b), of the tubular layer of fibre material (20).

10. Method for lining a defective sewer shaft (100), which has a first shaft portion (110) having a first diameter and an adjacent second shaft portion (120) having an expanded diameter and a berm (130) and a channel (131) below the second shaft portion (120), characterized by the following method steps: securing one end of a lining tube (1) according to one of Claims 1 to 6 to a pot-like packer (200), lifting the packer (200) with the lining tube (1) secured thereto into a vertical position above the sewer shaft (100) in such a manner that the seam (72) is located at the lower end of the lining tube (1), orientating the seam (72) along the channel (131) of the sewer shaft (100), orientating the end, which is closed by the seam (72), of the lining tube until the seam (72) extends parallel with the longitudinal direction of the channel (131) and lowering the packer (200) with the lining tube (1) secured thereto into the sewer shaft (100) until the seam (72) comes to rest in the channel (131) and expanding an air bag (64) which is closed in an air-tight manner in the region of the base of the sewer shaft (100) inside the lining tube (1) by introducing a pressurized medium, in particular compressed air, into the air bag (64) in such a manner that the lining tube (1) radially expands inside the sewer shaft (100) with the desired breaking location (14) being separated in the connection portion (12) and bears on the inner wall of the expanded second sewer portion (120) and on the berm (130) and the channel (131), and curing the reaction resin in the layer (20) of fibre material by introducing a radiation source or hot vapour or hot water into the interior of the expanded air bag (64) which is arranged in the lining tube (1).

11. Method according to Claim 10, characterized in that the first and second longitudinal slots (42a, 42b) are introduced into the outer film tube (40) when it is located in a vertical position above the sewer shaft (100) after the packer (200) has been raised.

12. Method according to Claim 11, characterized in that after the first and second longitudinal slots (42a, 42b) have been introduced into the outer film tube (40), the slotted portions of the outer film tube (40) are folded over in an upward direction, a lubricant (80) is subsequently applied to the uncovered regions of the outer side of the layer of fibre material (20), and in that afterwards the slotted portions of the outer film tube (40) are folded back again onto the outer side, which is provided with lubricant (80), of the radially expandable layer of fibre material (20).

13. Method according to one of Claims 10 to 12, characterized in that prior to the lining tube (1) being lowered into the sewer shaft (100), there are provided on the inner wall of the first and / or second shaft portion (110, 120) retention elements (140, 141), in particular blocks and / or shortened rungs and / or grooves which after the lining tube (1) has been completely lowered into the sewer shaft (100) are covered by the outer side of the outer film tube (1) and the fibre material which is arranged therein with a local radial bulge (302, 303) of the fibre material being produced, wherein the local radial bulges (302, 303) of the fibre material engage behind the retention elements (140, 141) after the expansion and curing of the lining tube (1) in a positive-locking manner and mechanically fix the lining tube in the sewer shaft (100).