AU2006200958A1

AU2006200958A1 - Formed part and reconstruction method

Info

Publication number: AU2006200958A1
Application number: AU2006200958A
Authority: AU
Inventors: Herbert Bodenbender
Original assignee: BODENBENDER GmbH
Current assignee: BODENBENDER GmbH
Priority date: 2005-04-25
Filing date: 2006-03-06
Publication date: 2006-11-09
Also published as: DE102005019449A1

Description

AUSTRALIA

Patents Act 1990 BODENBENDER GMBH COMPLETE SPECIFICATION STANDARD PATENT Invention Title: Formed part and reconstruction method The following statement is a full description of this invention including the best method of performing it known to us:- 2 The invention concerns a formed part according to the generic part of claim 1 as well as a reconstruction method according to the generic part of claim When reconstructing sewerage pipes laid in the ground a lining hose is applied to the internal surfaces of the damaged pipes. This consists, for example, a flexible fibre fabric, that is impregnated with a hardenable synthetic resin (resin adhesive) and is pressed in a form-locked manner against the wall of the old pipe. After the setting of the resin adhesive the house connection pipes discharging into the main pipe are exposed again by cutting through or out the lining applied at the corresponding positions.

So that no water could reach in the regions of the house connection pipes between the old pipe and the lining hose, DE 39 29 558 Al proposes to close off these transition zones watertight with a tubular formed lining part. The latter consists of a flexible fibre fabric, that at one end is provided with an equally elastic collar and for the purpose of fixing on the pipelines is impregnated with synthetic resin. For the installation the formed part, is pulled into the house connection pipe with a so-called pipe eel. Subsequently a bellows is inserted into the pipe, with which the formed lining part is pressed against the internal wall until the resin adhesive hardens. At the same time the tubular section of the formed lining part should abut flush with its surface against the internal surface of the house connection pipe and the collar on the internal surface of the main pipe.

It is a disadvantage in this case, that the collar of the formed liner part often cannot be made to abut reliably against the internal wall of the main pipe. Pleats are produced or the entire formed part is pulled or pushed too far into the house connection pipe, so that no longer can the collar fully cover the transition region.

The result is leakage. In addition, the cross-section of the opening of the house connection pipe may decrease.

The object of the invention is to overcome these and further disadvantages of the state-of-the-art and reliably to produce a formed part, that is cost-effectively constructed with simple means and seals the transition region between a main Ipipe and a house connection pipe, while the size always remains the same.

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0 Furthermore, the formed part should be able to be easily manipulated and be always insertable with correct fit into the house connection pipe.

The main features of the invention are stated in the characterising part of claims 1 and 20. Configurations are subject of claims 2 to 19 and 21 to 31.

00 For a formed part to line the transition region between a sewerage pipe and a house connection pipe discharging into it, with a hose-shaped section that can be introduced into the house connection pipe abutting against its internal surface and with a collar-shaped second section that can abut against the internal surface of the sewerage pipe, the invention provides that the collar-shaped section has an inherent stability of form.

The inherently stable collar-shaped section of the formed part abuts therefore always flat against the internal surface of the sewerage pipe, without the formed part being able to slide too far into the house connection pipe or to slip off the edge. The collar does not produce pleats either, which form leakage channels or may reduce the remaining diameter of the reconstructed openings of the house connections. Rather does the collar with the inherently stable form ensure always a precise and permanent sealing of the seat of the formed part in the transition region of the main pipe into the house connection pipe. At the same time the annular gap, often occurring between the pipe and a possibly newly introduced reconstructed wall, is also reliably sealed. Moreover, the entire formed part can be fast and precisely installed, not least because due to the collar, providing its shape, the cylindrical section can be introduced pleat-free into the house connection pipe.

Further advantages of the formed part according to the invention are as follows: The manufacture of the collar-shaped section as an injection moulded part makes an extremely rational and consequently cost-effective production feasible.

I The use of a thixotropic or pasty adhesive, in combination with the formed

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0 part, quite considerably simplifies its manipulation. Firstly, the adhesive can be applied fast and simply. It does not drip and, in addition, ensures an even coating. Therefore the adhesive can compensate for the unevennesses on the internal surface of the sewerage pipe.

The inscription area provided makes a subsequent identification of the formed part possible, what can be very significant to assert guarantee 00 claims.

In the case of a method, using a formed part to reconstruct at least one transition region between a sewerage pipe and a house connection pipe discharging into it, the invention further provides that a hose-shaped section of the formed part is impregnated with a resin adhesive, and a collar-shaped section form of the formed part with an inherently stable form is coated with a thixotropic or pasty resin adhesive, and that the collar-shaped section with that side, that had been coated with the adhesive, is placed on the internal surface of the sewerage pipe and the hose-shaped section is introduced into a house connection pipe.

The collar, with the inherently stable form and preferably with a shape that matches the sewerage pipe, ensures, that the formed part can be always inserted into the house connection pipe fast and accurately. To enable the adhesion of the collar with the internal surface of the sewerage pipe, a thixotropic or pasty resin adhesive is applied, that not only adheres well to the surface of the collar, but without any problem can also cover or fill in unevennesses of the sewerage pipe or small cracks or gaps. The second section, fixed on the collar, is impregnated with an easy-flowing resin adhesive, and is introduced into the house connection pipe after attaching the collar to the internal surface of the sewerage pipe. At the same time the collar ensures, that the formed part cannot enter too far into the house connection pipe. It rather ensures a permanent good seat and an equally good sealing of the transition region.

Further features, details and advantages of the invention become apparent from the text of the claims, as well as from the following description of embodiments, based on the drawings. They show in; Fig.1 a schematic oblique view of a formed part, Fig.2 a partial sectional view of a transition region between a sewerage pipe and a house connection pipe with the formed part of Fig.1 inserted into the house connection pipe, Fig.3 a partial sectional view of a transition region between a sewerage pipe and a house connection pipe with the formed part placed onto a packer, Fig.4 the formed part, placed onto the packer, prior to pressing against the internal surfaces of the pipes, the packer of Fig.3 during the pressing of the formed part against the internal surfaces of the pipes, and Fig.6 the formed part, completely inserted into the transition region.

The formed part 10, designated in Fig.1 in toto by 10, serves the purpose of lining a transition region B between a sewerage pipe A (main pipe) laid in the ground and a house connection pipe H discharging into it. The formed part has a hoseshaped section 20, that is axially introduced into the house connection pipe H, as well as a collar-shaped section 30 at the end, said section being brought into the sewerage pipe A flush with the internal surface I of the sewerage pipe A.

The hose-shaped section 20 is preferably constructed as a single- or multilayered woven fabric hose, that is manufactured from an flexible woven fabric, for example a polyester needled felt. For the purpose of fixing on the internal surface F of the house connection pipe H the hose-shaped section is impregnated with a hardenable liquid resin adhesive. On the internal surface 21 of the woven fabric hose 20 a coating 22 from a flexible, moisture-resistant material, for example a polyurethane, polyvinyl chloride or polypropylene film, may be provided.

The resin adhesive used to impregnate the woven fabric hose 20 is preferably a two-component polyurethane resin or a two-component epoxy resin.

IND The collar-shaped section 30 has, as such, inherent stability of form and is

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C preferably constructed as a cylinder wall section 33, the outside radius (not designated) of which essentially corresponds to the inside radius (not designated either) of the main pipe A (see Fig.2). An opening 31 is made in the collar 30, on the peripheral edge of which a tubular neck projection 34 is formed. The opening 31 in the collar 30 forms the subsequent opening for the reconstructed house connection pipe H.

The neck section 34, protruding over the collar 30, serves to mount and fix the (Ni woven fabric hose 20, that is adhered to, sewn to or compressed together with, for example, the wall of the neck section 34. One can, however choose a combination of the joining methods mentioned. For the purpose of fixing it on the internal surface I of the sewerage pipe A, the collar-shaped section 30 is coated with a resin adhesive, that is preferably thixotropic or has a pasty consistency with a relatively high viscosity.

The collar 30 with inherent stability of form is preferably an injection moulded plastic part that, depending on the object of reconstruction, is manufactured with various dimensions. It can be used, for example, in house connection pipes H having nominal diameters of 100 to 200. At the same time the diameter of the opening 31 is between 80 mm and 180 mm. The radius of the cylinder wall section 33 depends on the dimensions of the sewerage pipe A in question, that can have nominal diameters between 200 and 600.

As injection moulded material PVC, for example, or a glass-fibre reinforced material can be used. The latter preferably contains casting resin material on resin base like, for example, unsaturated polyester resins, epoxy resins, methylacrylate resins, phenylacrylate resins or isocyanate resins.

To adhere the pre-formed collar 30 to the internal surface I of the sewerage pipe A, both the cylinder wall section 33 and the neck section 34 are coated with a thixotropic or pasty adhesive. In this case one deals, for example, with a thixotropic polyurethane resin or a thixotropic epoxy resin. The use of a pasty filler on epoxy resin base is also conceivable. What is important is, that during the IND introduction of the formed part 10 into the pipes A, H, the resin adhesive will

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O adhere to the surface 32 of the collar 30 and retains an approximately even coating thickness until the setting of the collar 30 on the internal surface I of the sewerage pipe A. This will ensure, that the collar 30 can be permanently firmly IN 5 adhered to the sewerage pipe A. Furthermore, unevennesses, possibly present,

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will be evened out by the adhesive.

00 So that the formed part 10 would have an overall even wall thickness, the wall thickness of the neck section 34 is thinner than the wall thickness of the cylinder IN 10 wall section 33. The thickness of the woven fabric material for the hose 20 is also

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0 thinner than the wall thickness of the cylinder wall section 33, while the overall thickness of the hose material and of the wall of the neck section 34 is approximately that of the cylinder wall section 33.

The thickness of the woven fabric material for the hose 20 is preferably between 3mm and 6 mm (including the coating 22). The wall thickness of the neck section 34 is preferably about 1 mm, so that the overall thickness of the formed part 10 in the region of the neck section 34 is approx. 4 mm to 7 mm. The thickness of the cylinder wall section 33 of the collar 30 is approx. 3 mm to 6 mm.

It can be recognised, that the formed part 10 according to the invention can be installed in pipes A, H of all current materials, while the resin adhesives used can be matched to suit the relevant pipe material, so that a force-locked and formlocked joint is produced, that ensures a permanent joint of the house connection pipe H to a sewerage pipe A. The injection moulded parts 30 and the associated fabric hose 20 form in this case, in conjunction with the associated adhesives, a building block system, from which, depending on the object, the appropriate combination may be selected.

So that to be able to test and evaluate the guarantee claims that may arise, on the hose-shaped and/or collar-shaped section 20, 30 of the formed part 10 an inscription area 40 is provided, to which a registered consecutive number, as well as a date is applied. Based on this number one can always determine the formed I part 10 as well as the resin adhesive supplied with it. Furthermore, it can be

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Odetermined when the formed part set was manufactured and/or supplied.

For the installation of the formed part 10 a so-called packer P is used. As Fig.3 shows, it has a main chamber K in the form of a hollow rubber body to press the collar-shaped section 30 of the formed part 10 against the internal surface I of the 0 sewerage pipe A, and lateral chamber L in the form of a lateral bulge to press the hose-shaped section 20 of the formed part 10 against the internal surface F of the 0 house connection pipe H. The main chamber H can be actuated by compressed air via a valve connection (not illustrated) and subsequently vented. For the Slateral chamber L a separate compressed air connection (not illustrated either) is provided, so that both chambers K, L can be operated independently from one another. The packer P is provided with a carriage G (schematically illustrated), that is supported on the internal surface I of the sewerage pipe A by means of wheels R. The main chamber K is axially rotatably mounted in the carriage G, so that the lateral chamber L can approach at any circumferential angle and can axially enter into the targeted house connection pipe H.

To introduce the packer P into the sewerage pipe A, a motor-driven cart (not illustrated) is provided. It has a coupling ((not illustrated either), that interacts with the corresponding counterpart on the packer P. The packer is supplied with the necessary compressed air via the coupling. Additional current connections complement the system. A camera, mounted on the cart, makes it possible to externally observe the reconstruction work with the packer P inside the pipes A,

H.

The lateral inlet is reconstructed as follows: First the packer P is wrapped around with a protective film (not illustrated) and additionally sprayed with silicon. Following this the packer P is connected with the cart via the coupling and introduced into the sewerage pipe A, for example through an inspection opening.

I The resin adhesive intended for the house connection pipe H and the felt hose

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0 is prepared and mixed. The woven fabric material of the hose 20 is impregnated with the resin adhesive. Afterwards the resin adhesive, intended for the joining the sewerage pipe A and the collar 30, is prepared and mixed. The surface 32, IN 5 that is subsequently facing the internal surface I of the sewerage pipe A, is evenly thickly coated with the thixotropic adhesive, by means, for example, of a spatula 0 or a brush. At the same time it is advisable to coat not only the cylinder wall section 33 of the collar 30, but also the neck projection 34.

The formed part 10, completely prepared at this stage, is placed on the lateral chamber L of the packer P, that is wrapped in the protective film. It is moved by the cart into the sewerage pipe A. At the same time the lateral chamber L is laid rearwards, opposing the direction of travel (see Fig.3).

While observing through a camera, the packer P is moved into the sewerage pipe A until the lateral chamber L, as Fig.4 shows, is positioned below or in the transition region B that is to be reconstructed. Afterwards first the main chamber K is charged with compressed air and consequently the formed part 10 is pressed with the cylinder wall section 33 of the collar 30 against the internal surface I of the sewerage pipe A. The adhesive, applied to the collar 30, is evenly distributed, so that a form-locked joint is produced (see Fig.5). Following this the lateral chamber L is filled with compressed air via the coupling of the cart, so that the hose 20, fastened on the collar 30, is introduced into the house connection pipe H and abuts against its internal surface F. The adhesive in the fabric of the hose ensures in this case also a form-locked joint.

When all chambers K, L are filled with compressed air, the cart is uncoupled from the packer P and removed from the sewerage pipe A. It can now accept a further packer P, fitted with a formed part 10, and move to a furthertransition region B.

Consequently, during the hardening period of the adhesive further house connections can be reconstructed with the cart.

After the expiry of the hardening period of the formed part 10 introduced last, the cart is coupled in succession to all packers P positioned in the sewerage pipe A.

IN At the same time the chambers K, L are vented and detached from the respective

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0formed part 10. Following this the cart pulls out every packer P individually from the sewerage pipe A. The formed parts 10, introduced into the transition region B between the sewerage pipe A and the house connection pipe H protruding into it, IN 5 remain in the pipe system. The lateral inlets are reconstructed (see Fig.6).

The invention is not limited to one of the above described embodiments, but can 00 have a multitude of variations. Thus the formed part 10 can be built not only into the existing pipes A, H. Both the sewerage pipe A and the house connection pipe H could have been already reconstructed with a separate pipe in-liner. In this case the hose 20 and the collar 30 are adhered to the respective in-liner.

The hose-shaped section 20 can be moulded on the edge into the collar-shaped section 30 during the injection moulding process. Such a joint alone withstands extremely high loads without any problem.

A further embodiment provides, that the collar-shaped section 30 is not premanufactured as an injection moulded part, but, just like the hose-shaped section is made from a woven fabric material, while rods, wires, bars or the like are radially and/or in the circumferential direction, sewn and/or woven into the woven fabric material. This will also ensure, that when the formed part 10 is introduced, the collar 30 will always abut against the internal surface I of the sewerage pipe A in a form-locking manner and the formed part 10 is secured in the house connection pipe. At the same time, just like in the case of plastic collars, the remaining elasticity of the collar 30 compensates for the unevennesses in the pipes A. The collar-shaped section 30 from the woven fabric material is impregnated preferably with a hardenable resin. However, the collar can be additionally or alternatively coated with a synthetic resin adhesive, that is preferably thixotropic.

Another alternative provides that the collar-shaped section 30 is produced from a woven fabric material, into which seam beads are introduced radially and/or in the circumferential direction. These also take care of the required inherent stability of form of the collar 30, that can be always introduced with its full area into the IND sewerage pipe A and at the same time prevent the formation of pleats or the

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Oreaching of the formed part 10 too far into the house connection pipe H.

All features and advantages, including constructive details, spatial arrangements and process steps, becoming apparent from the claims, description and drawing, may be essential for the invention individually and in the most varied 0 combinations.

IND

IList of reference numerals 0 A Sewerage pipe B Transition region F Internal surface (house connection pipe) H House connection pipe I Internal surface (sewerage pipe) K Main chamber L Lateral chamber P Packer

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Formed part Hose-shaped section/Woven fabric hose 21 Internal surface 22 Coating Collar-shaped section/Collar 31 Opening 32 Surface/Side with adhesive 33 Cylinder wall section 34 Pipe/Neck projection Inscription area

Claims

1. A formed part to line the transition region between a sewerage pipe and a house connection pipe discharging into it, with a hose-shaped section that can be introduced into the house connection pipe abutting against its internal surface and with a collar-shaped section that can abut against the internal surface of the sewerage pipe, characterised in that the collar-shaped section has an inherent stability of form.

2. A formed part according to claim 1, characterised in that the collar-shaped section is made from synthetic material.

3. A formed part according to claim 1 or 2, characterised in that the collar- shaped section is made from a glass-fibre reinforced material.

4. A formed part according to any one of claims 1 to 3, characterised in that the collar-shaped section is an injection moulded part. A formed part according to claim 1, characterised in that the collar-shaped section is made from a woven fabric material, while rods, wires, bars or the like are sewn and/or woven into the woven fabric material radially and/or in the circumferential direction.

6. A formed part according to claim 1, characterised in that the collar-shaped section is made from a woven fabric material, into which seam beads are introduced radially and/or in the circumferential direction.

7. A formed part according to any one of claims 1 to 6, characterised in that for the purpose of joining the hose-shaped section, the collar-shaped section is provided with a pipe- or neck-projection.

8. A formed part according to any one of claims 1 to 7, characterised in that the hose-shaped section and the collar-shaped section are adhered to, sewn to and/or compressed with one another. S9. A formed part according to any one of claims 1 to 8, characterised in that the hose-shaped section is cast into the collar-shaped section on the edge. I 5 10. A formed part according to any one of claims 1 to 9, characterised in that the O hose-shaped section is made from an flexible woven fabric material. 00 k 11. A formed part according to any one of claims 1 to 10, characterised in that C 0the hose-shaped section is impregnated with a hardenable resin, in particular N 10 a multi-component synthetic resin. 12 A formed part according to claim 10 or 11, characterised in that the woven fabric material is constructed with a plurality of layers.

13. A formed part according to any one of claims 10 to 12, characterised in that the woven fabric material is coated with a flexible film, non-permeable by liquid.

14. A formed part according to any one of claims 1 to 13, characterised in that the collar-shaped section is impregnated with a hardenable resin, in particular a multi-component synthetic resin. A formed part according to any one of claims 1 to 13, characterised in that the collar-shaped section is impregnated with a resin adhesive.

16. A formed part according to claim 15, characterised in that the resin adhesive is a pasty substance.

17. A formed part according to claim 15 or 16, characterised in that the resin adhesive is thixotropic.

18. A formed part according to any one of claims 1 to 17, characterised in that the hose-shaped and/or collar-shaped section are provided with an inscription area.

19. A formed part according to claim 18, characterised in that the inscription area is provided with a registered, consecutive number and/or a date.

20. A method to reconstruct at least one transition region between a sewerage pipe and a house connection pipe discharging into it, with a formed part, in 0 particular according to any one of claims 1 to 19, characterised in that a hose-shaped section of the formed part is impregnated with a resin adhesive and a collar-shaped section of the formed part with an inherently stable form is coated with a thixotropic or pasty resin adhesive, and that the collar- shaped section with that side, that had been coated with the adhesive, is placed on the internal surface of the sewerage pipe and the hose-shaped section is introduced into a house connection pipe.

21. A method according to claim 20, characterised in that the hose-shaped section and the collar-shaped section are pressed against the internal surfaces of the pipes until the setting of the resin adhesive.

22. A method according to claim 20 or 21, characterised in that the sections are pressed by a packer, a bellows or the like.

23. A method according to claim 22, characterised in that the packer has a main chamber to press the collar-shaped section of the formed part against the internal surface of the sewerage pipe and a lateral chamber to press the hose-shaped section of the formed part against the internal surface of the house connection pipe.

24. A method according to claim 22 or 23, characterised in that the formed part, provided with the adhesive, is placed onto the packer, in particular on the lateral chamber. A method according to any one of claims 22 to 24, characterised in that prior to the placement of the formed part, the packer is provided with a protective film. C26. A method according to any one of claims 22 to 25, characterised in that the Npacker is coupled to a cart driven by a motor, it is introduced with this into the sewerage pipe and is driven up to the transition region to be reconstructed. N

27. A method according to any one of claims 22 to 26, characterised in that first the main chamber of the packer and subsequently the lateral chamber of the packer is charged with compressed air.

28. A method according to any one of claims 22 to 27, characterised in that after pressing the formed part, the cart is uncoupled from the packer.

29. A method according to any one of claims 22 to 28, characterised in that the packer remains in the sewerage pipe until the complete setting of the resin adhesive on the transition region to be reconstructed. A method according to any one of claims 26 to 29, characterised in that for the rectification of a further transition region the cart brings at least one further packer into the sewerage pipe.

31. A method according to any one of claims 26 to 30, characterised in that after the setting of the resin adhesive and of the formed parts, the cart is coupled to the packers, vents these and is removes them from the sewerage pipe. DATED this 6th dayof March 2006 BODENBENDER GMBH Patent Attorneys for the Applicant: F.B. RICE CO.