A method for sewer relining

Abstract

A method for sewer relining The sewer relining uses a repair assembly, which comprises a first lateral liner part and a junction seal part such as a hat profile or a full-wrap profile. The lateral liner part and the junction seal part are impregnated with a first curable material such as a resin that is curable by exposure to electromagnetic radiation. The lateral liner part is arranged at the junction seal part whereafter it is inverted. The assembly is then moved to the site of installation through the sewer and the lateral liner part is everted.

Description

[0001] A method for sewer relining

[0002] DESCRIPTION

[0003] The present disclosure relates to the field of repairing pipelines such as a pipeline of a sewer system, specifically repairing at a sewer junction between a main pipeline and a lateral pipeline by means of a liner / repair assembly, e.g. at the connection between the main pipeline and the lateral pipeline (sewer junction). It may also be a straight pipeline that needs to be repaired. In such a case, the repair assembly comprises two tubes that are put together in the same way as described for the sewer junction situation (where a tubular liner is attached to the skirt of another liner part).

[0004] Such repairing may be termed relining, because the lining of the sewer is repaired such that it is not necessary with a new installation of a sewer pipe, e.g. no new pipe is installed, but a new liner is placed on the old liner / sewer wall.

[0005] The relining process typically includes that the liner / repair assembly is put in place in the sewer by means of an installation assembly comprising a launcher device, a bladder and the liner / repair assembly. The bladder is attached to the launcher device. When the installation assembly is at the indented position at the sewer junction, the repair assembly (specifically the lateral liner part) is “shot’Vejected from the installation assembly by pressure into position, while the bladder is also inflated by pressurized air such that it can hold the liner / repair assembly in place as it cures. When the liner / repair assembly has cured, the launcher device is pulled out of the sewer. The shooting of the lateral liner part into the lateral pipeline is also called eversion process.

[0006] An example of an installation assembly is shown in WO18127583, which is incorporated in the present disclosure by reference.

[0007] A lateral pipeline is also known as a branch pipeline / connection / passageway. It may serve as a connection between the main pipeline and a building, such as a house.

[0008] The lateral pipeline may have an angle, e.g. it may be inclined.

[0009] The sewer junction may be a T-junction or a Y-junction. Since replacing pipelines is usually a costly and time-consuming process, it is well known to patch and / or reline the existing pipelines instead. However, for such solutions to be feasible it is necessary to create tight seals between the installed pipelines and the lining, or leakage will occur through gaps.

[0010] The main pipeline of the sewer system may comprise an elongated / main liner that has been installed before the seal and repair assembly, e.g. a sewer system may constitute a pipeline with a liner installed, and a repair assembly is afterwards installed at the sewer junction. In some cases the sewer system is not fitted with a liner, instead only the repair assembly is used for repairing the sewer.

[0011] The repair assembly may be a material such as a felt that is impregnated with a liquid material / resin capable of curing and hardening, for example by means of electromagnetic radiation such as UV light. A coating is applied to one side for keeping the resin inside the felt.

[0012] The repair assembly may be a full-wrap or a hat. The full-wrap may be a liner having a T-shape or a Y-shape. The hat may be a liner in the shape of a hat, e.g. a tubular portion with a brim at one end and a skirt connected to the brim. In any case, the repair assembly comprises a lateral liner constituting a tube that extends in the lateral pipeline. The lateral liner of the repair assembly may be several meters long, such as up to 30 or 40 meters, which varies from one installation to the other, e.g. depending on the length of the lateral pipeline.

[0013] The varying length, together with the fact that the repair assembly is impregnated with a fluid material, may lead to an ineffective repair procedure, because the handling of the impregnated repair assembly is difficult, and the required length of the lateral liner may not be known in advance. This may require an inventory of different lengths, which does still not ensure that the correct length is brough to the field.

[0014] A first aspect of the present disclosure is:

[0015] A method for repairing or re-lining a sewer system by means of a repair assembly, said sewer system comprising a sewer junction between a main pipeline and a lateral pipeline, said method comprising: - providing a lateral liner part and a junction seal part such as a hat profile or a fullwrap profile, said lateral liner part and said junction seal part being impregnated with a first curable material such as a resin, said first curable material being curable by exposure to electromagnetic radiation, said lateral liner part having a distal end and a proximal end opposite said distal end,

[0016] - assembling said repair assembly by arranging said proximal end at said junction seal part, and interconnecting said lateral liner part and said junction seal part by means of an overlap between said lateral liner and said junction seal part or by means of a fastener, such as a socket or a resin or glue or stitches or staples, fastening said lateral liner part to said junction seal part after said lateral liner part and said junction seal part being impregnated with said first curable material, said repair assembly comprising a junction or overlap between said lateral liner part and said junction seal part,

[0017] - inverting at least part of said lateral liner part such that said distal end is moved through said junction seal part,

[0018] - moving said repair assembly to said sewer junction, and

[0019] - everting said lateral liner part into said lateral pipeline for arranging said lateral liner part in said lateral pipeline.

[0020] A second aspect of the present disclosure is:

[0021] A method for repairing or re-lining a sewer system by means of a repair assembly, said method comprising:

[0022] - providing said repair assembly, said repair assembly comprising a first liner part and a second liner part, said first liner part and said second liner part being impregnated with a first curable material such as a resin, said first curable material being curable by exposure to electromagnetic radiation,

[0023] - providing an apparatus for radiating electromagnetic radiation, - arranging said first liner part next to said second liner part such that said first liner part has a junction or overlap with said second liner part,

[0024] - connecting said first liner part to said second liner part by curing at a plurality of positions along said junction or overlap by means of said apparatus,

[0025] - installing said repair assembly in said sewer system.

[0026] The junction is where the first liner part and second liner part meet.

[0027] The lateral liner part may constitute a first liner part, and a second liner part may be constituted by a skirt of the junction seal part or simply another straight liner when the repair assembly is for a straight main liner, e.g. not the sewer junction case. These two parts may constitute a repair assembly for relining not only a lateral pipeline, but also a main pipeline, as mentioned in the introduction above.

[0028] Part of the junction seal part defines a tube, e.g. a hollow cylinder that is to extend in the lateral liner. It is this part that is to be connected to the lateral liner par, e.g. the free end of the tube of the junction seal part is to be connected to the proximal end of the lateral liner part.

[0029] The following examples show a first liner part constituted by a lateral liner part and a second liner part constituted by a junction seal part. By analogy, the term lateral liner part may be substituted with the term first liner part in the examples, and the term skirt of the junction seal part may be substituted with the term second liner part, e.g. the skirt is a second liner part.

[0030] The curing may take place in situ, that is in the field at the manhole with the access to the sewer system. Thus, the repair assembly may be impregnated and then transported to the field / in situ, where it may be assembled and installed.

[0031] The lateral liner part and the junction seal part may be provided as discrete / separate items, e.g. they do not constitute an integral unit - at least not until they may be connected to each other. The arrangement may be carried out in situ, that is at the physical location of the sewer needing relining (installation site), even though the repair assembly is impregnated with curable material, e.g. the repair assembly is impregnated before arranging the lateral liner part at the junction seal part at the installation site.

[0032] The whole lateral liner part may be inverted, and part of the skirt of the junction seal part may be inverted.

[0033] When the lateral liner part has been everted into the lateral pipeline, the lateral liner part may then be cured in situ. The curing of the first curable material may be done by an (EM) apparatus radiating electromagnetic radiation. This is typically called a light head or light curing device. The apparatus moves inside the liner while irradiating the liner until the first curable material has cured. The lateral liner part may be pressed against the lateral pipeline while it is cured. The pressing may be done by means of the installation assembly’s bladder, which is also everted into the lateral pipeline and inflated. When a bladder is used, the EM apparatus moves inside the bladder.

[0034] Inverting refers to the process of turning the lateral liner part inside out, e.g. the inner surface turned outward. Normally, the inner surface is coated (this is the side that face the interior of the sewer when the lateral liner part has been installed). When the lateral liner part is inverted, the coating will constitute the outside surface. Everting refers to the opposite process. Thus, first the lateral liner part is turned inside out, and then everted into the lateral pipeline.

[0035] A number of specific solutions may be contemplated for arranging the lateral liner part at the junction seal part such that the inverting and everting may be carried out without ending up with an installation having leaks, because the lateral liner part has moved away from the junction seal part during either the inverting or the everting.

[0036] For example, the lateral liner part may be sewed with needle and thread together with the junction seal part, or the two may be stapled together by means of staples. However, such a solution may be non-trivial to carry out in praxis because the lateral liner part and the junction seal part are soaked with the curable material. The curable material may be sticky and / or unhealthy and during sewing or stapling the operator may be exposed to the curable material or it may leak onto the surroundings. Furthermore, the sewing or stabling may result in holes in the repair assembly, which may cause leakage. This may be remedied by arranging a binder / band on top of the holes to cover the holes such that the risk of leakage is reduced.

[0037] It is also contemplated that the two parts (proximal end of the lateral liner and the other part of the repair assembly, the skirt) may have an overlap, for example placing the proximal end of the lateral liner part inside the junction seal part or vice versa, whereby the friction between the two holds the lateral liner part in place during inversion and subsequent eversion.

[0038] To enhance the friction a socket may be placed between the lateral liner part and the junction seal part - the socket being of a material such that the friction is higher than it otherwise would be if it were just the lateral liner part that was in contact with the junction seal part. However, for such a solution, where the lateral liner part and junction seal part are not fixed to each other, there is a risk of the lateral liner part moving.

[0039] Alternatively, the proximal end of the lateral liner part may be cured together with the junction seal part by irradiating an overlap between the two. In cases where both the lateral liner part and the junction seal part have a coating, part of the coating may need to be removed before the curing can take place. Alternatively, a junction seal part having a skirt without coating at the free end of the skirt (the end opposite the brim part) may be provided. The “coating-less” part of the skirt may be arranged adjacent / on top of part of the proximal end of the lateral liner part, e.g. such that the impregnated parts of the skirt and lateral liner are in contact such that they can be cured together. Alternatively, a lateral liner part having a proximal end without coating may be provided and arranged such that the coating-less part of the lateral liner is adjacent / on top of the free end of the skirt.

[0040] The coating-less part may have a length in the range 1 cm to 20 cm, such as 1 cm to 15 cm, such as 1 cm to 10 cm, such as 1 cm to 5 cm.

[0041] The curing may not necessarily take place all 360 degrees, because this could make the inversion and eversion process more difficult. Instead, the curing may be done at a number of positions. This keeps the repair assembly flexible such that it may be inverted and everted. Preferably, the overlap may be cured at a plurality of points, such as two or three or more. Alternatively, a socket (in the form of a short tube) may be used such that the socket is placed around the lateral liner part and the junction seal part, where the lateral liner part meets the junction seal part, such that the socket has a first overlap with the lateral liner part and a second overlap with the junction seal part. These two overlaps may each be cured in the same way as described in connection with the overlap above.

[0042] In the following, specific examples according to aspects of the present disclosure will be explained in more detail with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms than depicted below, and should not be construed as limited to any examples set forth herein. Rather, any examples are provided so that the disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout. Like elements will, thus, not be described in detail with respect to the description of each figure.

[0043] Fig. 1a illustrates an apparatus for radiating electromagnetic radiation.

[0044] The apparatus may be used in the specific situation where the lateral liner part is to be connected to the junction seal part (or another elongated liner part) by point curing an overlap between the lateral liner part and the junction seal part or when using a socket arranged around the lateral liner part and the junction seal part - at the two overlaps at the junction between the lateral liner part and the junction seal part.

[0045] The apparatus constitutes a clamping device for clamping the repair assembly, and it has a first clamp arm 10, and a second clamp arm 12. Each clamp arm has the shape of a circular arc, and the two clamp arms are hinged together by means of a hinge 14 at one end of each clamp arm. The other end of each clamp arm comprises a first handle 16 and a second handle 18 constituting a pair of handles. At the distal end of the handle pair is a lock comprising a groove in the second handle and a pivotable bracket 20 having a pin 22 to be received in the groove such that the clamping device may be locked.

[0046] The apparatus comprises a plurality of light emitters - in the example is illustrated a total of 16 LEDs including a first LED 24. Another number of light emitters may be contemplated, such as up to 2 or up to 4 or up to 8 or up to 12 or up to 16 or up to 20. Power may be supplied to the device by means of a wire 26.

[0047] Fig. 1b illustrates the apparatus in its locked state.

[0048] Each LED is arranged such that it irradiates in a radial direction. When using 16 LEDs, the apparatus may cure at 16 points, e.g. at an angular spacing of 360 / 16 = 22.5 degrees - thus there are 22.5 degrees between each point.

[0049] As an alternative, a simpler apparatus may be used. For example, an apparatus in the shape of a pen having a single LED at the end. A point may be cured by pointing with the pen.

[0050] The curing may take 16 times as long time (compared to above mentioned apparatus) if 16 points are to be cured.

[0051] Fig. 2a illustrates an exploded view of part of the process of point curing a socket to the repair assembly, e.g. for connecting the lateral liner part to the junction seal part.

[0052] The launcher device including the bladder 34 is placed in a frame 36 together with the junction seal part.

[0053] The frame comprises a lower part (preferably shaped as a hollow half cylinder) and a lid 33, which is hinged to the lower part so that the frame may be opened and closed.

[0054] In fig. 2a the lid is in the open position for placing the junction seal part and the launcher device including bladder.

[0055] In fig. 2a the junction seal part is a hat comprising a skirt 38 and wherein the main liner part is in the form of a brim portion 40.

[0056] The junction seal part is arranged between the frame and the bladder.

[0057] The skirt extends out of a lateral frame part 42. The bladder comprises a lateral bladder part 44 extending inside the skirt. The junction seal part may be placed in the frame, and the distal end of the skirt moved out through the lateral frame part, before the lateral bladder part is moved through the skirt. The lateral bladder part may be moved by means of compressed air.

[0058] The bladder is held on the launcher device 60 by means of tape 62 and straps at each end of the launcher device. Compressed air may be introduced into the bladder at one end of the launcher device.

[0059] Fig. 2b illustrates the state when the socket is ready to be cured together with the junction seal part and the lateral liner part.

[0060] The clamping device is locked and clamped around the socket, and the bladder is inflated such that the lateral liner part and skirt 38 are pressed against the socket, which is pressed against the clamping device.

[0061] Part of the skirt has been cut out to show the inflated lateral bladder part 44.

[0062] The proximal end of the lateral liner part is next to the distal / free end of the skirt (the proximal end of the skirt is at the brim portion). The intersection between the lateral liner part and the junction seal part may be termed a border or junction (the socket covers the border).

[0063] The lid of the frame is in the closed position. In this way, the lid holds on to the bladder as it is inflated - the lid provides a reaction force for keeping the bladder / launcher device in place.

[0064] As an alternative to using a socket, part of the coating at the proximal end of the lateral liner may be removed - or the lateral liner may be manufactured such that there is no coating at the proximal end. This part of the lateral liner may then be placed on the other part of the repair assembly (such as the skirt) such that the felt materials / impreg- nated parts are in contact, e.g. there is no coating between the two parts of the repair assembly that are to be cured together - otherwise the two parts cannot be cured together. Alternatively, part of the skirt may also have its coating removed, and that part may be placed on the proximal end of the lateral liner part, e.g. it is an alternative way to the former example. It is contemplated that, in general, junction seal parts are manufactured being without coating (coating-less) at the free end of the skirt. A kit of parts may then be provided having such a junction seal part (with a coatingless free end), and a lateral liner of up to 50 m or 100 m or 200 m, which may be cut into a desired length and connected / cured to the junction seal part.

[0065] Fig. 2c illustrates a cross-sectional view together with a close-up around an LED 24 of the clamping device (electromagnetic apparatus).

[0066] The cross section is a view in a plane through the overlap between the socket and the lateral liner part. These two are between the lateral bladder part 44 and the clamping device.

[0067] The lateral liner part has a first coating 32 and a first impregnated material / felt 50.

[0068] The socket has a second coating 52 and a second impregnated material / felt 30.

[0069] The coating may serve as a barrier for the curable material, which is in a liquid state before it is cured, e.g. the felt is impregnated with the curable material.

[0070] The close-up illustrates the point curing by means of the slanted-line hatch pattern.

[0071] When the socket has been cured together with the lateral liner part and the junction seal part, the repair assembly is ready to be inverted.

[0072] Fig. 3 shows a relatively long skirt 38, and that the whole lateral liner part 32 has been inverted and is located inside the skirt.

[0073] Part of the skirt has been inverted as well. The socket has moved from being on the outside of the skirt and the lateral liner part to be on the inside. Part of the skirt and part of the lateral liner part have been cut away to illustrate the position of the socket. The circles on the socket illustrate the curing points.

[0074] The inversion may be done by applying air pressure or a vacuum. The inversion may be done without having connected the lateral liner part with the junction seal part, but since a vacuum is applied, there is a risk that the vacuum will pull the lateral liner part away from the junction seal part such that the border between the lateral liner part and the junction seal part will have a gap, which sewer water may leak through.

[0075] Fig. 4a illustrates the installation assembly with the repair assembly in the inverted state.

[0076] It is shown in the main pipeline 51 of the sewer as it is being transported from a manhole 53 to the sewer junction, where the main pipeline and lateral pipeline 55 meet. As can be seen, if the lateral liner part is not inverted and placed inside the bladder, the installation assembly may not necessarily fit in the sewer.

[0077] The installation assembly comprises an installation assembly frame / launcher device 60, which holds the bladder 34 - the bladder is held on to the launcher device by means of for example tape 62 at each end of the launcher device.

[0078] Both the lateral bladder part 44 and the lateral liner part 32 are inverted - the lateral liner part being inside the lateral bladder part. In the inversion, the two are moved inside the launcher device. This constitutes a packing into the installation assembly (launcher device, bladder and repair assembly (lateral liner part + junction seal part)).

[0079] The packing results in an installation assembly that has a size such that it may be moved through the sewer (main pipeline) to the sewer junction, where the eversion may begin.

[0080] Since the lateral pipeline is long in this case, the installation assembly includes a hose / tube 61 acting as a tail (“tail-hose” also called “canon-hose”) on the launcher device and which accommodates the inverted lateral liner part and lateral bladder part.

[0081] The installation assembly includes an apparatus 64 for curing.

[0082] Fig. 4b shows the installation assembly in situ after eversion, e.g. the bladder has been inflated by means of compressed air and presses the brim portion 40 against the main pipeline and the skirt + lateral liner part against the lateral pipeline.

[0083] The lateral bladder part 44 and lateral liner part 32 will evert when pressure is applied to the bladder, e.g. causing the parts to shoot out from inside the (main) bladder. The repair assembly (lateral liner part + socket + junction seal part) is now ready to be cured. As may be recalled, only points around the socket have been cured, so the rest of the socket is to be cured. This happens with the (second) apparatus 64 for radiating electromagnetic radiation. The apparatus is moved from its garage 65 and through the bladder (the bladder may be transparent for EM radiation such that the apparatus may irradiate the repair assembly through the bladder), while radiating electromagnetic radiation.

[0084] Fig. 4c shows the installation assembly in situ after eversion.

[0085] In this example, there is no socket. Instead, the example shows the mentioned situation where there is an overlap between the junction seal part and the lateral liner part, specifically between the free end of the skirt of the junction seal part and the proximal end of the lateral liner part.

[0086] The junction seal part has a third coating 31 , and a third impregnated material / felt 71.

[0087] The junction seal part does not have a coating at the free end of the skirt. Thus, the third impregnated material / felt overlaps the first impregnated material / felt 50. It is contemplated that the two have been cured together at a number of points before the eversion.

[0088] Fig. 4c comprises a zoom of the installation at the overlap.

[0089] Now follows a set of points, which constitute aspects of the present disclosure which may be considered independently patentable, and as such the following sets of points form basis for possible future sets of claims:

[0090] 1 . A method for repairing or re-lining a sewer system by means of a repair assembly, said sewer system comprising a sewer junction between a main pipeline and a lateral pipeline, said method comprising:

[0091] - providing a lateral liner part and a junction seal part such as a hat profile or a fullwrap profile, said lateral liner part and said junction seal part being impregnated with a first curable material such as a resin, said first curable material being curable by exposure to electromagnetic radiation, said lateral liner part having a distal end and a proximal end opposite said distal end,

[0092] - assembling said repair assembly by arranging said proximal end at said junction seal part, and interconnecting said lateral liner part and said junction seal part by means of an overlap between said lateral liner and said junction seal part or by means of a fastener, such as a socket or a resin or glue or stitches or staples fastening said lateral liner part to said junction seal part after said lateral liner part and said junction seal part are impregnated with said first curable material.

[0093] 2. The method according to any of the preceding points, said repair assembly comprising a junction or overlap between said lateral liner part and said junction seal part.

[0094] 3. The method according to any of the preceding points, comprising: inverting at least part of said lateral liner part such that said distal end is moved through said junction seal part.

[0095] 4. The method according to any of the preceding points, comprising:

[0096] - moving said repair assembly to said sewer junction.

[0097] 5. The method according to any of the preceding points, comprising:

[0098] - everting said lateral liner part into said lateral pipeline for arranging said lateral liner part in said lateral pipeline.

[0099] 6. A method for repairing or re-lining a sewer system by means of a repair assembly, said method comprising:

[0100] - providing said repair assembly, said repair assembly comprising a first liner part and a second liner part, said first liner part and said second liner part being impregnated with a first curable material, such as a resin, said first curable material being curable by exposure to electromagnetic radiation,

[0101] - providing an apparatus for radiating electromagnetic radiation, - arranging said first liner part next to said second liner part such that said first liner part has a junction or overlap with said second liner part,

[0102] - connecting said first liner part to said second liner part by curing at a plurality of preferably discrete positions along said junction or overlap by means of said apparatus,

[0103] - installing said repair assembly in said sewer system.

[0104] 7. The method according to any of the preceding points, comprising connecting said first liner part to said second liner part such that a connection between said first liner part to said second liner part having a breaking strength being greater than the force acting on said connection when inflating said repair assembly.

[0105] 8. The method according to any of the preceding points, said everting comprising moving said distal end through said lateral liner part and said junction seal part.

[0106] 9. The method according to any of the preceding points, said repair assembly comprising a junction between said lateral liner part and said junction seal part.

[0107] 10. The method according to any of the preceding points, comprising: providing an inflatable bladder inside said repair assembly and inflating said inflatable bladder such that said inflatable bladder presses from the inside of said repair assembly when said first apparatus irradiates electromagnetic radiation towards said repair assembly.

[0108] 11. The method according to any of the preceding points, said lateral liner part having a proximal end without coating.

[0109] 12. The method according to any of the preceding points, said junction seal part having a free end without coating.

[0110] 13. The method according to any of the preceding points, comprising: connecting said lateral liner part and said junction seal part such that a connection between said lateral liner part and said junction seal part has a breaking strength being greater than the force acting on said connection when inverting at least part of said lateral liner part.

[0111] % socket

[0112] 14. The method according to any of the preceding points, comprising providing a socket, and arranging said socket at said junction.

[0113] 15. The method according to any of the preceding points, said socket having a first socket overlap with said lateral liner part, and a second socket overlap with said junction seal part.

[0114] 16. The method according to any of the preceding points, said socket being impregnated with a second curable material, such as a resin, said second curable material being curable by exposure to electromagnetic radiation.

[0115] 17. The method according to any of the preceding points, said socket comprising a material such that said socket and said lateral liner part experience friction when sliding against each other.

[0116] 18. The method according to any of the preceding points, comprising arranging said socket between said lateral liner part and said junction seal part.

[0117] % discrete curing points

[0118] 19. The method according to any of the preceding points, comprising providing a first apparatus for radiating electromagnetic radiation, said first apparatus preferably comprising a light emitting diode.

[0119] 20. The method according to any of the preceding points, comprising: irradiating electromagnetic radiation by means of said first apparatus towards said overlap such that said lateral liner part is cured together with said junction seal part at a first position, and preferably at a second position a distance greater than zero from said first position with no curing between said first position and said second position.

[0120] 21. The method according to any of the preceding points, comprising: irradiating electromagnetic radiation by means of said first apparatus at a third position a distance greater than zero from said second position, and preferably at a fourth position a distance greater than zero from said third position with no curing between said second position and said third position.

[0121] 22. The method according to any of the preceding points, comprising: irradiating electromagnetic radiation by means of said first apparatus towards said first socket overlap such that said lateral liner part is cured together with said socket at a first position, and preferably at a second position a distance greater than zero from said first position with no curing between said first position and said second position.

[0122] 23. The method according to any of the preceding points, comprising: irradiating electromagnetic radiation by means of said first apparatus towards said second socket overlap such that said junction seal part is cured together with said socket at a first position, and preferably at a second position a distance greater than zero from said first position with no curing between said first position and said second position.

[0123] % fastener or binder

[0124] 24. The method according to any of the preceding points, comprising: providing a fastener and connecting said lateral liner part together with said junction seal part by means of said fastener.

[0125] 25. The method according to any of the preceding points, said fastener piercing or penetrating said lateral liner part and said junction seal part.

[0126] 26. The method according to any of the preceding points, comprising providing a binder and arranging said binder on said fastener such that said binder covers the piercing holes from said piercing.

[0127] 27. The method according to any of the preceding points, said fastener being a staple or a stitch.

[0128] % skirt

[0129] 28. The method according to any of the preceding points, said junction seal part comprising a main liner part for arranging in said main pipeline, and a skirt for arranging in said lateral pipeline. 29. The method according to any of the preceding points, said proximal end being connected to said skirt.

[0130] 30. The method according to any of the preceding points, said skirt being arranged be- tween said first lateral liner part and said main liner part.

[0131] 31. The method according to any of the preceding points, said lateral liner part being longer than said skirt. 32. The method according to any of the preceding points, said lateral liner part being a tube.

[0132] 33. The method according to any of the preceding points, comprising providing a second apparatus for radiating electromagnetic radiation, and curing said repair assembly by irradiating said repair assembly with electromagnetic radiation by means of said second apparatus after said everting.

Claims

CLAIMS1 . A method for repairing or re-lining a sewer system by means of a repair assembly, said sewer system comprising a sewer junction between a main pipeline and a lateral pipeline, said method comprising:- providing a lateral liner part and a junction seal part such as a hat profile or a fullwrap profile, said lateral liner part and said junction seal part impregnated with a first curable material such as a resin, said first curable material being curable by exposure to electromagnetic radiation, said lateral liner part having a distal end and a proximal end opposite said distal end, said junction seal part comprising a main liner part for arranging in said main pipeline, and a skirt for arranging in said lateral pipeline, said lateral liner part being longer than said skirt,- assembling said repair assembly by arranging said proximal end at said skirt, and interconnecting said lateral liner part and said junction seal part by means of an overlap between said lateral liner part and said skirt or by means of a fastener such as a socket or a resin or glue or stitches or staples fastening said lateral liner part to said skirt after said lateral liner part and said junction seal part being impregnated with said first curable material,- inverting at least part of said lateral liner part such that said distal end being moved through said junction seal part,- moving said repair assembly to said sewer junction, and- everting said lateral liner part into said lateral pipeline for arranging said lateral liner part in said lateral pipeline.

2. The method according to any of the preceding claims, comprising providing a first apparatus for radiating electromagnetic radiation, said first apparatus preferably comprising a light emitting diode.

3. The method according to any of the preceding claims, comprising irradiating electromagnetic radiation by means of said first apparatus towards said overlap such that said lateral liner part being cured together with said junction seal part at a first position, and preferably at a second position at distance from said first position.

4. The method according to any of the preceding claims, said junction seal part having a free end without coating.

5. The method according to any of the preceding claims, said interconnection having a breaking strength being greater than the force acting on the connection when inverting at least part of said lateral liner part.

6. The method according to any of the preceding claims, said inverting comprising moving said distal end through said lateral liner part and said junction seal part.

7. The method according to any of the preceding claims, said junction seal part comprising a main liner part for arranging in said main pipeline, and a skirt for arranging in said lateral pipeline.

8. The method according to any of the preceding claims, said proximal end connected to said skirt.

9. The method according to any of the preceding claims, said skirt arranged between said first lateral liner part and said main liner part.

10. The method according to any of the preceding claims, said lateral liner part being longer than said skirt.

11. The method according to any of the preceding claims, said lateral liner part being a tube.

12. The method according to any of the preceding claims, comprising providing a second apparatus for radiating electromagnetic radiation, and curing said repair assembly by irradiating said repair assembly with electromagnetic radiation by means of said second apparatus after said everting.

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