Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
  • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
  • F16L55/1656—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section materials for flexible liners
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B1/00—Layered products having a non-planar shape
  • B32B1/08—Tubular products
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/024—Woven fabric
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
  • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
  • F16L55/1652—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section
  • F16L55/1654—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section and being inflated

Definitions

• the present invention relates to textile hoses made of a fabric, in which the fabric has a maximum tensile strength according to DIN 53857 of more than 2200 N and an air permeability of less than 10 l/dm 2 x min and in which the fabric is sewn with at least one seam over the entire length of the hose via overlapping edges of the fabric. On the outer side of the seam, a plastic sheet is applied to the disclosed hose, which extends over the seam area of the hose.
• the present invention further relates to the use of such textile hoses for sealing damaged pipes, kits for rehabilitating pipes which comprise such textile hoses, and methods for rehabilitating and/or repairing pipes in which such textile hoses or kits are used.
• a felt hose is inserted using the so-called inversion method.
• a slideway or a film hose (“preliner”) is first inserted into the pipe to be renovated as a so-called lost formwork and then a felt hose (“main liner”) as a carrier hose, together with a calibration hose.
• preliner slideway or a film hose
• main liner felt hose
• main liner main liner
• main liner due to their material properties (unreinforced plastic film and felt fabric), neither the preliner nor the main liner can absorb radial or axial forces.
• the combination of main liner and calibration hose is limited in its ability to absorb axial forces.
• the conventional preliner is airtight due to its material structure. All components are installed one after the other using the inversion method.
• the system is pulled in from maintenance shaft to maintenance shaft or from a maintenance shaft to a "blind" end (i.e. installation in a pipe end without access, so-called open-end method).
• the system is pressurized to around 0.8 bar and expanded.
• the synthetic resin contained in the main liner is then cured.
• This system also has the disadvantage that the damaged contour of the inner wall of the pipe to be repaired is copied, with the negative consequences described above. Since the system can hardly absorb axial forces, irregular cross-sections of the old pipe are reshaped.
• the felt hose follows the shape of the old pipe with all its deformations.
• hybrid liner uses a hybrid liner, i.e. a felt tube reinforced with glass fibre mats.
• the hybrid liner is pulled into a reinforced, light and air-impermeable film tube (preliner) and pulled into the damaged pipe together with the calibration tube.
• preliner reinforced, light and air-impermeable film tube
• the hybrid liner is supplied or impregnated with synthetic resin on site at the construction site. The arrangement is pulled from shaft to shaft and with the help of the calibration hose is expanded radially. The synthetic resin in the hybrid liner is then cured.
• the hybrid liner mentioned After curing, the hybrid liner mentioned has a significantly higher resistance than a simple felt hose due to the integrated glass fiber reinforcement with a higher modulus of elasticity and higher bending tensile strength.
• the inversion process is not possible here.
• the hybrid liner can only be installed in a pipeline by pulling it in without kinks and, due to the limited flexibility of the glass fibers, it can only bend to a very limited extent. This makes its installation, which is only possible between freely accessible maintenance shafts, more complex and expensive. It is an object of the invention to propose an arrangement and a method with which the disadvantages known from the prior art are avoided or at least greatly reduced.
• WO 2020/244883 A1 describes a system for rehabilitating a pipe with a fabric layer resting on the inner wall of the pipe, a felt layer positioned underneath and an inner fabric layer coated with a release agent, in particular in the form of silicone.
• the fabric layers are formed by textile hoses that are woven in one piece (one piece woven) and thus have no seams or welds that can form potential weak points in the hoses.
• a disadvantage of this system is that the available hoses based on this technology do not have sufficient tear resistance, so that the hoses can be damaged when rehabilitating a pipe, which can impair the rehabilitation result.
• Another disadvantage is that the hoses are manufactured using special machines and not in large strips, which makes the hoses relatively expensive.
• hoses with sufficient stability can be made from fabric that is commonly referred to as "airbag fabric” and that is characterized by an air permeability of less than 10 l/(dm 2 x min) (determined according to DIN EN ISO 9237: 1995, at a test pressure of 500 Pa) and a maximum tensile force of at least 2200 N/5cm.
• the fabric is suitably designed in such a way that it provides the specified air permeability and maximum tensile force on its own, without the need for a coating.
• opposite edges of webs of the fabric can be attached to one another with a seam.
• a plastic web is then attached to this seam, which on the one hand distributes tensile forces on the seam over a large area of the hose, and on the other hand covers protruding components of the seam and protects them from damage caused by friction with other components of the repair system.
• This design offers significant advantages, particularly for "calibration hoses", which are used as the innermost component of the repair system and are removed from the pipe after a synthetic resin has solidified.
• the present invention accordingly relates to a textile hose made of a fabric with a maximum tensile strength according to DIN 53857 of at least 2200 N/5cm and an air permeability of less than 10 l/(dm 2 x min), wherein the fabric is connected to at least one seam over the entire length of the textile hose via overlapping edges of the fabric and a plastic sheet is attached to the outer side of the seam, which extends over the seam area of the hose.
• the overlapping edges of the fabric are connected with at least two seams, whereby three seams have proven to be the optimal compromise between processing effort and strength; therefore, such a design is particularly preferred.
• the hose has several seams, these are preferably arranged at a distance from each other that is large enough so that the stability of the fabric is not affected by the seams and that, on the other hand, there is no overlap of the overlapping edges of the fabric that exceeds the necessary amount, which leads to a high material expenditure.
• the several seams are arranged at a distance from each other in the range of 0.1 to 1 cm and more preferably 0.2 to 0.6 cm.
• the present invention is not subject to any relevant restrictions, provided that the material has a maximum tensile strength according to DIN 53857 of at least 2200 N/5cm.
• the indication "5cm” indicates that the maximum tensile strength is determined for a band with a width of 5 cm.
• Polyamide fabrics are particularly preferred, and in particular polyamide fabrics based on polyamide 6, polyamide 6.6 or polyamide 4.6.
• the present invention is not subject to any relevant restrictions with regard to the fineness of the yarns used for the fabrics, provided that the fineness must be able to provide the required strengths on the one hand, and that no more material than necessary should be used on the other.
• a range of 200 to 700 dtex and in particular 230 to 500 dtex can be specified as suitable orders of magnitude for the fineness for the weft and warp threads.
• the basis weight of the fabric depends to a certain extent on the fineness, which is the basis weight for the fabric from which the textile tube is made. is formed, preferably in the range of 120 to 400 g/m 2 and in particular in the range of 140 to 320 g/m 2 .
• the outside of the textile hose according to the invention is modified with an adhesion-suppressing coating.
• a silicone coating is particularly suitable for this.
• the "outside” of the hose refers to the side on which the plastic sheet is attached.
• the fabric from which the textile hose according to the invention is formed has a maximum tensile strength according to DIN 53857 of at least 2200 N/5cm.
• the maximum tensile strength is more preferably at least 2500 N/5cm and in particular at least 2700 N/5cm and/or at most 6000 N/5cm, in particular at most 5000 N/5cm and even more preferably at most 4500 N/5cm.
• Other advantageous properties for the fabric are the tear strength and the maximum tensile strength elongation. It is preferred for the maximum tensile strength elongation to be more than 15% and/or at most 70%.
• a maximum tensile strength elongation of at least 20% and in particular at least 25% and/or at most 60% and in particular at most 50%.
• a range of 80 to 300 N and in particular 100 to 250 N can be specified as particularly suitable for the tear strength.
• the maximum tensile elongation and the tear strength are to be determined in accordance with DIN 53857 or DIN 53859, whereby the standard valid on the registration date is decisive for all standards specified here.
• the fabric or the polymer from which the fabric is made preferably has a melting point of at least 120°C and preferably at least 150°C.
• the plastic sheet is preferably made of a material that is sufficiently resistant to and as unreactive as possible towards a synthetic resin used for a pipe rehabilitation system.
• Suitable materials include polyolefins, polysilicone or polyurethane.
• Suitable polyolefins include polyethylene or polypropylene.
• Polysilicone or polyurethane are particularly suitable, as these materials either already have release agent properties per se, or are particularly are temperature-resistant so that they cannot be damaged by heat when a synthetic resin hardens.
• the plastic sheet has a width that ensures that existing seams in the hose are covered by the plastic sheet and that a certain overhang is present so that the plastic sheet can be securely attached to the textile hose at its edges. It is preferred that the plastic sheet extends over a width in the range of 0.5 to 3 cm and preferably 1 to 2 cm over the seam or seams with which the edges of the hose are connected.
• the plastic sheet has a thickness that gives the layer the necessary resistance.
• a favorable range for the thickness can be specified as a frame in the range of 0.1 to 1.5 mm and preferably 0.2 to 0.8 mm.
• the plastic sheet can be attached to the outside of the textile hose according to the invention with an adhesive, such as an adhesive, or can be applied directly to the outside, for example by melting or otherwise softening an outside of the plastic sheet and laminating it onto the hose.
• an adhesive such as an adhesive
• the textile hose according to the invention preferably has a diameter adapted to standard pipes. Since repair systems based on the described technology can be used safely with smaller pipe diameters due to the greater curvature, it is preferred if the textile hose has a diameter in the range of 5 to 30 cm and preferably 8 to 20 cm.
• the seams can be designed as seams with double lock stitches, chain stitches or double chain stitches, in which case it is preferred if the seams are designed with a stitch density in the range of 1.5 to 6 stitches/cm and in particular 2.5 to 5 stitches per cm.
• the thread material or sewing thread used to connect the overlapping edges of the fabric is also not subject to any relevant Restrictions, as long as the material itself is sufficiently stable. However, it can be stated as particularly useful if the thread material or sewing thread has a total fineness in the range of 1000 to 3000 dtex and preferably 1200 to 2500 dtex and/or a maximum tensile strength of more than 50 N and preferably in the range of 70 to 200 N.
• a further aspect of the present invention relates to the use of a textile hose as described above as a calibration hose for sealing damaged pipes, wherein the calibration hose is used to press a composite of an outer hose and a felt layer impregnated with a synthetic resin mixture, which is introduced into the damaged pipe, against the inner walls of the damaged pipe.
• This is expediently done by filling the textile hose with a gas, in particular with air.
• the outer hose in this application is preferably made of a waterproof material, e.g. a plastic, but the outer hose can also be made of a fabric. It is also possible for the outer hose to be a waterproof fabric hose in which a fabric is combined with a waterproof material.
• a further aspect of the invention relates to a kit for renovating a pipe, in particular a sewer pipe, which comprises a textile hose A which corresponds to the textile hose described above, and a hose B with an outer fabric layer which is preferably impermeable to water, and an inner layer which contains a felt layer and a synthetic resin mixture impregnated therein, wherein the outer diameter of the textile hose A is matched to the inner diameter of the hose B such that the textile hose A, when completely filled with a gas, rests against the inner layer of the hose B.
• the outer diameter of the textile hose A is slightly smaller than the inner diameter of the hose B, which results from the felt layer being pressed against the outer fabric layer when the textile hose A is filled with gas.
• the outer tube in the two aspects described above is preferably made of polyurethane or contains polyurethane to form a continuous layer in which a fabric is optionally embedded.
• the outer tube has a basis weight in the range of 170 to 500 g/m 2 and preferably 200 to 300 g/m 2 .
• the fiber material from which the felt layer is formed is suitably a material commonly used in conventional pipe repair systems as specified above for the prior art.
• the fibers of the fiber material can be formed from an organic material, such as a thermoplastic polymer, in particular in the form of polyester, or an inorganic material, e.g. glass.
• the fiber material of the felt layer is based on glass fibers and is in particular a glass fiber felt.
• the fiber material is based on polyester and preferably has a weight in the range of 400 to 800 g/m 2 , in particular 500 to 700 g/m 2 . Regardless of the material from which the felt layer is formed, it preferably has a pore volume in the range of 85 to 97% and particularly preferably in the range of 90 to 95%.
• the fiber composite layer can be laminated with a polyurethane layer that is arranged on the side of the fiber composite layer opposite the outer plastic layer.
• Hose systems equipped in this way are sold, for example, under the name "Brawoliner®" by the company Brawo Systems.
• the synthetic resin is usually a curable material, whereby the curing can preferably be initiated by the introduction of heat, steam or light.
• the synthetic resin In order for the synthetic resin to be introduced into the gaps in the felt, it is expedient if the synthetic resin has a viscosity that is sufficiently low for impregnation of fiber materials (whereby this viscosity can also be achieved by adding a solvent or by impregnation at an elevated temperature).
• Synthetic resins that are particularly suitable in this context are, for example, polyester resins (UP resins), vinyl ester resins (VE) and epoxy resins.
• the resin is particularly preferably a two-component epoxy resin with a first component that is predominantly made up of epoxy components including diglycidyl ethers of bisphenol A, bisphenol F or mixtures of bisphenol A and F, as well as oligomerization products of such bisphenols and glycerin, and a second component comprising diamines, which preferably contain at least one of aminoethylpiperazine, condensation products of polypropylene glycol and aminopropanol (l-aminopropan-2-ol and/or l-aminopropan-3-ol), 2-methylpentane-1,5-diamine, isophoronediamine, 2,4,6-tris(dimethylaminomethyl)phenol, trimethylhexane-1,6-diamine, 3,6-diazaoctane-1,8-diamine and m-phenylenebis(methylamine) or are formed from these compounds.
• Commercially available two-component epoxy resins which can be used as synthetic resin
• the resin may additionally contain other components and additives to control properties, including but not limited to catalysts, heat and/or light stabilizers, thixotropic agents, plasticizers, solvents, mineral or organic fillers, blowing agents, dyes and pigments.
• Yet another aspect of the present invention relates to methods for renovating a pipe, in particular a sewage pipe, preferably using a kit as described above, which has the following steps: a) forming an inner layer S1 in a pipe, wherein the inner layer comprises a fabric layer S11 in contact with the inner wall of the pipe, which is preferably impermeable to water, and an inner layer containing a felt hose S12 and a synthetic resin mixture, b) introducing a textile hose S2, which corresponds to the textile hose described above and which is coated with a release agent that does not adhere to the synthetic resin mixture, preferably with silicone, into the interior of the inner layer S1, c) essentially sealing the textile hose S2 in an airtight manner, d) inflating the textile hose S2, e) continuously pressing the textile hose S2 and the inner layer S1 radially onto the pipe, f) allowing the curable synthetic resin mixture to harden, g) Remove the textile tube S2 from inside the inner support Sl.
• the fabric layer Sil can be designed as a fabric-reinforced hose, i.e. as a hose that has a continuous matrix and a fabric embedded therein.
• a fabric-reinforced hose i.e. as a hose that has a continuous matrix and a fabric embedded therein.
• the fabric layer instead of the fabric layer there is only a continuous matrix without fabric (i.e. as a sliding track or film hose).
• the hose can be designed in one piece (without connecting edges).
• a fabric layer can either be designed as a one-piece woven or can be expediently designed with a seam, in particular in combination with a plastic sheet, as described above for the hose according to the invention.
• the layer is introduced into the pipe separately from the felt tube, and the S12 felt tube is introduced into the fabric together with the plastic mixture independently of the Sil layer in a second step, or whether the Sil and S12 layers are introduced into the pipe as a composite (with a loose connection or a connection formed solely by the uncured synthetic resin). It is particularly advantageous if the S12 felt layer and the Sil layer are placed on top of each other before being introduced into the pipe so that the felt layer forms the outer layer and the sequence of layers is reversed when the composite is turned inside out when it is introduced into the pipe.
• the synthetic resin can be applied to the felt layer on site and worked into the felt layer, whereby contamination of other components by the synthetic resin can be largely avoided.
• the process can also be used for pipes where only one-sided access is possible at the time of assembly (open-end technique).
• the pipes that are renovated or sealed using the described procedure are preferably sewer or wastewater pipes.
• the textile tube S12 is exposed to heat, steam or light in its interior during steps f) and g).
• the curing of the synthetic resin mixture can be advantageously supported and accelerated by means of a heat, steam or light source arranged therein.
• the textile hose is inflated to a pressure of up to 4 bar in step e), so that the first hose is pressed firmly against the pipe, in particular the sewage pipe.
• This procedure enables the production of almost perfect pipe linings that are extremely tight.
• the textile hose is already under such pressure that no groundwater or similar can get into the lining from the outside until the synthetic resin hardens.
• a textile hose construction according to the invention is shown in Figures 1 (front) and 2 (back).
• the "front” here refers to the side over which the hose can rest on a felt layer; the surface of this layer is siliconized in the hose shown.
• the hose has a flat width of 20 cm and is made from an airbag fabric that has been connected to form a hose with an overlapping edge and three seams.
• a polyurethane strip with a width of about 4 cm is attached above the seams, so that the seams are positioned centrally and the strip protrudes about 1.5 cm beyond the seams in the width direction.
• the seams are arranged at a distance of about 3 mm from each other.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Laminated Bodies (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=86185159

Family Applications (1)

Country Status (5)

Citations (6)

• 2023
  • 2023-04-24 EP EP23169590.9A patent/EP4455532A1/de active Pending
• 2024
  • 2024-04-24 AU AU2024260961A patent/AU2024260961A1/en active Pending
  • 2024-04-24 JP JP2025550156A patent/JP2026506223A/ja active Pending
  • 2024-04-24 WO PCT/EP2024/061269 patent/WO2024223675A1/de not_active Ceased
• 2025
  • 2025-10-22 MX MX2025012606A patent/MX2025012606A/es unknown

Patent Citations (6)

Also Published As

Similar Documents

Legal Events