EP2776231A1 - Method for lining existing pipe on inside and inner lining pipe - Google Patents

Method for lining existing pipe on inside and inner lining pipe

Info

Publication number
EP2776231A1
EP2776231A1 EP12786970.9A EP12786970A EP2776231A1 EP 2776231 A1 EP2776231 A1 EP 2776231A1 EP 12786970 A EP12786970 A EP 12786970A EP 2776231 A1 EP2776231 A1 EP 2776231A1
Authority
EP
European Patent Office
Prior art keywords
inner lining
pipe
lining pipe
plasticizer
nitrile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12786970.9A
Other languages
German (de)
French (fr)
Inventor
Tommy Ånäs
Anna-Marja LAAKSO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uponor Infra Oy
Original Assignee
Uponor Infra Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uponor Infra Oy filed Critical Uponor Infra Oy
Publication of EP2776231A1 publication Critical patent/EP2776231A1/en
Withdrawn legal-status Critical Current

Links

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
    • F16L55/1652—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
    • F16L55/1653—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 pressed into contact with the pipe by a tool which moves inside along the pipe
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/02—Thermal shrinking
    • B29C61/025—Thermal shrinking for the production of hollow or tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/26—Lining or sheathing of internal surfaces
    • B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/26—Lining or sheathing of internal surfaces
    • B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
    • B29C63/343—Lining or sheathing of internal surfaces using tubular layers or sheathings the tubular sheathing having a deformed non-circular cross-section prior to introduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/38—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
    • B29C63/46—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses of internal surfaces
    • 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
    • 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

Definitions

  • the invention relates to a method for lining an existing pipe on the inside.
  • the invention also relates to an inner lining pipe intended for application inside an existing pipe.
  • Damaged or leaking sewage pipes can be repaired by arranging a flattened and folded plastic pipe inside the existing sewage pipe.
  • the plastic pipe that has been flattened and folded is made round by using heat and inter- nal pressure inside the sewage pipe.
  • This type of solution is disclosed in publications EP 0593564 and DE 3519439, for instance.
  • Publication US 4867921 also discloses a solution, in which a flat- tened and folded plastic pipe is arranged inside a sewage pipe and said plastic pipe is then expanded to a round shape inside the sewage pipe.
  • the sewage pipe is formed in the flattened and folded shape, which means that making it round requires a high internal pressure. Further, in view of this solution, too, there is a need to provide a more versatile inner lining so- lution of a pipe.
  • the method of the invention is characterised by forming an inner lin- ing pipe mainly of polyvinyl chloride, the pipe having a certain original outer dimension that is smaller than the inner circumference of the existing pipe to be lined, placing the inner lining pipe inside the pipe to be lined and expanding the inner lining pipe in such a manner that its original outer dimension becomes larger by causing a radial orientation in the wall material of the inner lin- ing pipe.
  • the inner lining pipe of the invention is characterised in that the inner lining pipe has an original outer dimension that is smaller than the inner circumference of the existing pipe to be lined, whereby the inner lining pipe is expandable from its original outer dimension to have a larger outer dimen- sion in such a manner that a radial orientation is formed in the wall material of the inner lining pipe.
  • an inner lining pipe with a certain original outer dimension is made mainly of polyvinyl chloride. Said original outer di- mension is smaller than the inner circumference of the existing pipe to be lined.
  • the inner lining pipe is installed inside the pipe to be lined. After this, the inner lining pipe is expanded in such a manner that the original outer dimension becomes larger such that a radial orientation in the wall material of the inner lining pipe is caused. This way, the inside pressure resistance of the inner lining pipe can be substantially increased.
  • Orientation also improves the mechanical properties of the pipe wall in general, that is, the wall of a pipe made of oriented material need not be as thick as the wall of a pipe having corresponding mechanical properties and made of similar but non-oriented material. This way, the inner lining pipe can be used in the repair and renovation of both existing pressure less pipes, such as sewage pipes, and existing pressure- water pipes, such as tap water pipes.
  • the inner lining pipe is expanded from its original outer dimension by at least 10%, in another embodiment by at least 20%.
  • the wall material of the inner lining pipe has eight parts or less plasticizer to 100 parts polyvinyl chloride.
  • Figure 1 is a block diagram illustrating the implementation of the in- ner lining of an existing pipe
  • Figure 2 is a schematic representation of the installation of an inner lining pipe inside an existing pipe
  • FIGs 3, 4, and 5 are schematic cross-sections of point A-A of Figure 2 illustrating the different steps of the installation of the inner lining pipe. Detailed description of the invention
  • FIG. 1 is a schematic illustration of the repair of an existing pipe with an inner lining pipe.
  • the inner lining pipe is formed by extruding a PVC pipe made mainly of polyvinyl chloride and having a round cross- sectional shape and a certain original outer dimension, which in the case of a round pipe is thus the outer circumference.
  • the outer dimension is the length of the border line of the pipe's cross-sectional shape along the outer surface of the pipe.
  • Said original outer dimension or circumference is smaller than the inner circumference of the existing pipe.
  • the inner circumference is the length of the border line of the pipe's cross-sectional shape along the inner surface of the pipe. If said original outer circumference is to a sufficient degree smaller than the inner circumference of the existing pipe, the routine can proceed directly to step 3, or if pre-heating is not required, to step 4.
  • the outer dimension of the pipe is made smaller in step 2.
  • the outer dimen- sion is made smaller at such a temperature that the material of the inner lining pipe keeps a memory of the original round shape and size.
  • the outer dimension is altered for instance by flattening and folding the round pipe. The pipe then does not require as much space during storage and transportation as a pipe of the original diameter.
  • a pipe that is smaller in its outer di- mension is easier to arrange inside an existing pipe.
  • the decrease in the outer dimension may also take place in such a manner that the round shape of the pipe is kept, that is, the pipe is reduced with a round condensing cone, for instance.
  • step 3 the inner lining pipe is pre-heated at the installation site.
  • the pre-heating facilitates the handling of the pipe, that is, its installation inside an existing pipe becomes easier.
  • step 4 the inner lining pipe is installed inside the existing pipe. If necessary, at this stage, it is possible to apply traction to the inner lining pipe in such a manner that an axial-direction orientation is formed in the wall of the inner lining pipe.
  • step 5 the inner lining pipe is heated in such a manner that it returns to its original round shape and size. This heating may be done by arranging warm fluid, such as warm air, vapour, or water, inside the inner lining pipe. If the inner lining pipe has been made round and its outer dimension has not been decreased after its manufacture, step 5 is naturally not needed at all.
  • warm fluid such as warm air, vapour, or water
  • step 6 the inner lining pipe is expanded in such a manner that an outer circumference is formed that is larger than said original outer dimension. This way, a radial-direction orientation is achieved in the material of the inner lining pipe, which significantly improves the strength properties of the inner lining pipe, especially its internal pressure resistance. If the inner lining pipe has been stretched to provide axial orientation, a biaxial orientation has been achieved to the inner lining pipe after step 6.
  • the expansion of the inner lining pipe in step 6 may be done in such a manner, for example, that plugs are arranged at each end of the inner lining pipe and pressurized fluid is arranged inside the pipe.
  • the expansion according to step 6 may also be done mechanically, for example, by pulling an ex- panding piece, such as a liquid-containing bag, through it.
  • the inner lining pipe can also be formed by extrusion in such a manner that during formation the inner lining pipe has a cross-section that differs from round.
  • the decrease in the outer dimension of the pipe, that is step 2 is then not necessary.
  • the inner lining pipe is made round by means of heat and internal pressure achieved by means of fluid, for instance, arranged in side it.
  • the outer dimension of the inner lining pipe is increased, as described earlier in connection with step 6.
  • the original outer dimension of the inner lining pipe that is, the outer dimension created during manufacture, is smaller than the inner circumference of the existing pipe to be lined, so that the outer dimension can be increased to achieve radial orientation and, consequently, internal pressure resistance.
  • Figure 2 is a schematic representation of the installation of an inner lining pipe 7 inside an existing pipe 8.
  • the existing pipe 8 is lined with the inner lining pipe 7 between two inspection wells or manholes 9, for instance.
  • Figure 2 also shows schematically heating means 10 for pre-heating the inner lining pipe 7.
  • the existing pipe 8 may be a cast iron, steel, plastic, or concrete pipe that is typically installed underground.
  • the inner diameter of the existing pipe may be in the range of 50 to 500 mm, for instance.
  • the existing pipe may be a water pipe, inside which pressurized water is conveyed, because the present inner lining pipe can be made to have extremely high internal pressure resistance.
  • the nominal operating pressure inside the pipe may be in the range of 10 bar, for instance.
  • the pressure re- sistance of the inner lining pipe is tested according to standard. In the test, different loads that are determined according to the wall thickness and diameter of the pipe and endure certain time periods at certain temperatures in accordance with the standard defining the test arrangements for pressure pipes, are applied to the inner lining pipe.
  • Figure 3 illustrates a situation, where the inner lining pipe has been installed inside an existing pipe 8 in a flattened and folded shape.
  • Figure 5 shows a situation, where the outer dimension of the inner lining pipe 7 has been expanded to achieve radial orientation.
  • the inner lining pipe is expanded so that its outer dimension increases at least 10% and in another embodiment at least 20%.
  • increasing the outer dimension of the inner lining pipe is technically the more demanding the more the outer dimension is increased.
  • increasing the outer dimension as much as possible provides a good end result.
  • the outer dimension is increased in an embodiment less than 80%. In yet another embodiment, the outer dimension is increased 20 to 50%.
  • the radial orientation degree of the pipe wall is the larger the more the outer dimension is increased.
  • the radial orien- tation degree of the pipe wall typically corresponds to how much the outer dimension is increased, in other words, when in an embodiment the outer dimension is increased 20 to 50%, the radial orientation degree of the pipe wall is correspondingly 20 to 50% after the outer dimension has been increased.
  • the radial orientation degree of the pipe wall is, after the expansion, at least 10% and in another embodiment at least 20%.
  • the inner lining pipe 7 is expanded so much that the final outer dimension is essentially equal to the inner circumference of the pipe 8 to be lined.
  • the in- crease in the outer dimension from the original outer dimension in other words, the radial orientation, must take place at the correct temperature. If the temperature is too low, cracking occurs on the wall of the inner lining pipe, which weakens the mechanical properties of the inner lining pipe. If the expansion takes place at too high a temperature, the orientation does not form evenly and the material wall may even weaken. Therefore, the orientation must take place at a temperature of 60 to 1 10°C, for example. In an embodiment, the temperature is at least 70°C, and in yet another embodiment, over 80°C. In yet another embodiment, the orientation takes place at a temperature of 90 to 100°C.
  • the inner lining pipe is formed of mainly polyvinyl chloride PVC.
  • PVC polyvinyl chloride
  • different additives may be mixed with the material.
  • One example of the composition of the inner lining material is as follows:
  • the filler may be one or more of the following: calcium carbonate
  • the stabilizer may be one or more of the following: calcium-zinc stabilizer, tin stabilizer, organic stabilizer, and any other stabilizer known per se.
  • the lubricant may be one or more of the following: paraffin wax, stearic acid, polyethylene wax, and any other lubricant known per se.
  • the co-stabilizer may be one or more of the following: antioxidant, epoxidized soybean oil, and any other co-stabilizer known per se.
  • the process auxiliary agent may be one or more of the following: calcium stearate, acryl process auxiliary agent, and any other process auxiliary agent known per se.
  • the plasticizer may be a polymer plasticizer, a monomer plasticizer, or a mixture thereof.
  • the plasticizer may be one or more of the following: urethane, such as thermoplastic polyurethane (TPU), acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / bu- tadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, citrate plasticizer, and any other plasticizer known per se.
  • TPU thermoplastic polyurethane
  • acryl acryl
  • nitrile chlorinated polyethylene
  • synthetic rubber ethyl vinyl acetate copolymer
  • acryl nitrile / bu- tadiene polymer nitrile butyl rubber
  • ethylene propylene diene monomer rubber phthalate plasticizer
  • adipate plasticizer citrate plasticizer
  • the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), nitrile, chlo- rinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer and citrate plasticizer.
  • TPU thermoplastic polyurethane
  • the plasticizer is used to facilitate the handling of the manufactured pipe.
  • the plasticizer improves the flexibility of the pipe, whereby the installation of the pipe is easier and the installation temperature need not be high.
  • the use of the plasticizer makes it more difficult to achieve sufficiently good pressure resistance for the pipe. Therefore, in an embodiment, 8 parts plasticizer or less is used for 100 parts polyvinyl chloride.
  • the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
  • TPU thermoplastic polyurethane
  • acryl acryl
  • nitrile chlorinated polyethylene
  • synthetic rubber ethyl vinyl acetate copolymer
  • acryl nitrile / butadiene polymer acryl nitrile / butadiene polymer
  • nitrile butyl rubber ethylene propylene diene monomer rubber
  • phthalate plasticizer phthalate plasticizer
  • adipate plasticizer adipate plasticizer
  • the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rub- ber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer, wherein the amount of acryl is less than 3 parts.
  • TPU thermoplastic polyurethane
  • acryl such as thermoplastic polyurethane (TPU)
  • acryl acryl
  • nitrile chlorinated polyethylene
  • synthetic rubber ethyl vinyl acetate copolymer
  • acryl nitrile / butadiene polymer acryl nitrile / butadiene polymer
  • nitrile butyl rubber ethylene propylene diene monomer rub- ber
  • phthalate plasticizer adip
  • the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), nitrile, chlorinated poly- ethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
  • TPU thermoplastic polyurethane
  • the total amount of acryl is less than 3 parts.
  • an insulation layer outside the inner lining pipe.
  • Such an insulation layer facilitates the heating that takes place inside the inner lining pipe. Further, the insulation layer prevents the inner lining pipe from cooling, so that for example the cold seeping from the ground during installation does not cool the inner lining pipe too much.
  • This external insulation may be made of softened polyvinyl chloride foam, for instance. The external insulation layer does not necessarily need to be fastened to the inner layer of the inner lining pipe.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Disclosed is a method for lining an existing pipe on the inside, and to an inner lining pipe. The inner lining pipe (7) with a certain original outer dimension is made mainly of polyvinyl chloride. Said original outer dimension is smaller than the inner circumference of the existing pipe (8) to be lined. The inner lining pipe (7) is installed inside the pipe (8) to be lined. After this, the inner lining pipe (7) is expanded in such a manner that its original outer dimension becomes larger by causing a radial orientation in the wall material of the inner lining pipe (7).

Description

Method for lining existing pipe on inside and inner lining pipe
Background of the invention
The invention relates to a method for lining an existing pipe on the inside.
The invention also relates to an inner lining pipe intended for application inside an existing pipe.
Damaged or leaking sewage pipes can be repaired by arranging a flattened and folded plastic pipe inside the existing sewage pipe. The plastic pipe that has been flattened and folded is made round by using heat and inter- nal pressure inside the sewage pipe. This type of solution is disclosed in publications EP 0593564 and DE 3519439, for instance. However, there is a need to provide an even more versatile solution for lining the inside of an existing pipe.
Publication US 4867921 also discloses a solution, in which a flat- tened and folded plastic pipe is arranged inside a sewage pipe and said plastic pipe is then expanded to a round shape inside the sewage pipe. In this solution, the sewage pipe is formed in the flattened and folded shape, which means that making it round requires a high internal pressure. Further, in view of this solution, too, there is a need to provide a more versatile inner lining so- lution of a pipe.
Brief description of the invention
It is an object of the present invention to provide a novel solution for lining an existing pipe on the inside.
The method of the invention is characterised by forming an inner lin- ing pipe mainly of polyvinyl chloride, the pipe having a certain original outer dimension that is smaller than the inner circumference of the existing pipe to be lined, placing the inner lining pipe inside the pipe to be lined and expanding the inner lining pipe in such a manner that its original outer dimension becomes larger by causing a radial orientation in the wall material of the inner lin- ing pipe.
Further, the inner lining pipe of the invention is characterised in that the inner lining pipe has an original outer dimension that is smaller than the inner circumference of the existing pipe to be lined, whereby the inner lining pipe is expandable from its original outer dimension to have a larger outer dimen- sion in such a manner that a radial orientation is formed in the wall material of the inner lining pipe.
In the present solution, an inner lining pipe with a certain original outer dimension is made mainly of polyvinyl chloride. Said original outer di- mension is smaller than the inner circumference of the existing pipe to be lined. The inner lining pipe is installed inside the pipe to be lined. After this, the inner lining pipe is expanded in such a manner that the original outer dimension becomes larger such that a radial orientation in the wall material of the inner lining pipe is caused. This way, the inside pressure resistance of the inner lining pipe can be substantially increased. Orientation also improves the mechanical properties of the pipe wall in general, that is, the wall of a pipe made of oriented material need not be as thick as the wall of a pipe having corresponding mechanical properties and made of similar but non-oriented material. This way, the inner lining pipe can be used in the repair and renovation of both existing pressure less pipes, such as sewage pipes, and existing pressure- water pipes, such as tap water pipes.
In an embodiment, the inner lining pipe is expanded from its original outer dimension by at least 10%, in another embodiment by at least 20%. Further, in an embodiment, the wall material of the inner lining pipe has eight parts or less plasticizer to 100 parts polyvinyl chloride.
Brief description of the figures
The invention will be described in greater detail in the attached drawings, in which:
Figure 1 is a block diagram illustrating the implementation of the in- ner lining of an existing pipe;
Figure 2 is a schematic representation of the installation of an inner lining pipe inside an existing pipe; and
Figures 3, 4, and 5 are schematic cross-sections of point A-A of Figure 2 illustrating the different steps of the installation of the inner lining pipe. Detailed description of the invention
Figure 1 is a schematic illustration of the repair of an existing pipe with an inner lining pipe. In step 1 , the inner lining pipe is formed by extruding a PVC pipe made mainly of polyvinyl chloride and having a round cross- sectional shape and a certain original outer dimension, which in the case of a round pipe is thus the outer circumference. The outer dimension is the length of the border line of the pipe's cross-sectional shape along the outer surface of the pipe. Said original outer dimension or circumference is smaller than the inner circumference of the existing pipe. The inner circumference is the length of the border line of the pipe's cross-sectional shape along the inner surface of the pipe. If said original outer circumference is to a sufficient degree smaller than the inner circumference of the existing pipe, the routine can proceed directly to step 3, or if pre-heating is not required, to step 4.
However, in the present embodiment, the outer dimension of the pipe is made smaller in step 2. In the presented embodiment, the outer dimen- sion is made smaller at such a temperature that the material of the inner lining pipe keeps a memory of the original round shape and size. In step 2, the outer dimension is altered for instance by flattening and folding the round pipe. The pipe then does not require as much space during storage and transportation as a pipe of the original diameter. Further, a pipe that is smaller in its outer di- mension is easier to arrange inside an existing pipe. The decrease in the outer dimension may also take place in such a manner that the round shape of the pipe is kept, that is, the pipe is reduced with a round condensing cone, for instance.
In step 3, the inner lining pipe is pre-heated at the installation site. The pre-heating facilitates the handling of the pipe, that is, its installation inside an existing pipe becomes easier. In step 4, the inner lining pipe is installed inside the existing pipe. If necessary, at this stage, it is possible to apply traction to the inner lining pipe in such a manner that an axial-direction orientation is formed in the wall of the inner lining pipe.
In step 5, the inner lining pipe is heated in such a manner that it returns to its original round shape and size. This heating may be done by arranging warm fluid, such as warm air, vapour, or water, inside the inner lining pipe. If the inner lining pipe has been made round and its outer dimension has not been decreased after its manufacture, step 5 is naturally not needed at all.
In step 6, the inner lining pipe is expanded in such a manner that an outer circumference is formed that is larger than said original outer dimension. This way, a radial-direction orientation is achieved in the material of the inner lining pipe, which significantly improves the strength properties of the inner lining pipe, especially its internal pressure resistance. If the inner lining pipe has been stretched to provide axial orientation, a biaxial orientation has been achieved to the inner lining pipe after step 6. The expansion of the inner lining pipe in step 6 may be done in such a manner, for example, that plugs are arranged at each end of the inner lining pipe and pressurized fluid is arranged inside the pipe. The expansion according to step 6 may also be done mechanically, for example, by pulling an ex- panding piece, such as a liquid-containing bag, through it.
The inner lining pipe can also be formed by extrusion in such a manner that during formation the inner lining pipe has a cross-section that differs from round. The decrease in the outer dimension of the pipe, that is step 2, is then not necessary. Further, in such a case, in step 5, the inner lining pipe is made round by means of heat and internal pressure achieved by means of fluid, for instance, arranged in side it. After this, the outer dimension of the inner lining pipe is increased, as described earlier in connection with step 6. In this embodiment, too, the original outer dimension of the inner lining pipe, that is, the outer dimension created during manufacture, is smaller than the inner circumference of the existing pipe to be lined, so that the outer dimension can be increased to achieve radial orientation and, consequently, internal pressure resistance.
Figure 2 is a schematic representation of the installation of an inner lining pipe 7 inside an existing pipe 8. The existing pipe 8 is lined with the inner lining pipe 7 between two inspection wells or manholes 9, for instance. Figure 2 also shows schematically heating means 10 for pre-heating the inner lining pipe 7.
The existing pipe 8 may be a cast iron, steel, plastic, or concrete pipe that is typically installed underground. The inner diameter of the existing pipe may be in the range of 50 to 500 mm, for instance. According to the present solution, the existing pipe may be a water pipe, inside which pressurized water is conveyed, because the present inner lining pipe can be made to have extremely high internal pressure resistance. The nominal operating pressure inside the pipe may be in the range of 10 bar, for instance. The pressure re- sistance of the inner lining pipe is tested according to standard. In the test, different loads that are determined according to the wall thickness and diameter of the pipe and endure certain time periods at certain temperatures in accordance with the standard defining the test arrangements for pressure pipes, are applied to the inner lining pipe. Said tests are not described in more detail herein, because the standard related to testing pressure pipes and the tests are known to a person skilled in the art. With the solution disclosed in this specification, it is possible to form an inner lining pipe that alone, that is, without the existing pipe 8 outside it, endures pressure water use, in other words, an inner lining pipe that meets the requirements set on the pressure water pipe in the standard. The inner lining pipe of this specification can be used to line pipes in a pressure sewage system. Further, the inner lining pipe of this specification can also be used to line so-called pressureless pipes, such as the sewage pipes of a pressureless sewage system.
Figure 3 illustrates a situation, where the inner lining pipe has been installed inside an existing pipe 8 in a flattened and folded shape.
In Figure 4, the inner lining pipe 7 has been returned to its round shape so that the length of the outer circumference of the inner lining pipe 7 equals the original outer circumference produced during manufacture.
Figure 5 shows a situation, where the outer dimension of the inner lining pipe 7 has been expanded to achieve radial orientation. In an embodi- ment, the inner lining pipe is expanded so that its outer dimension increases at least 10% and in another embodiment at least 20%. Naturally, increasing the outer dimension of the inner lining pipe is technically the more demanding the more the outer dimension is increased. However, for orientation, increasing the outer dimension as much as possible provides a good end result. Taking dif- ferent viewpoints into consideration, the outer dimension is increased in an embodiment less than 80%. In yet another embodiment, the outer dimension is increased 20 to 50%.
Typically, the radial orientation degree of the pipe wall is the larger the more the outer dimension is increased. On the other hand, the radial orien- tation degree of the pipe wall typically corresponds to how much the outer dimension is increased, in other words, when in an embodiment the outer dimension is increased 20 to 50%, the radial orientation degree of the pipe wall is correspondingly 20 to 50% after the outer dimension has been increased. In yet another embodiment, the radial orientation degree of the pipe wall is, after the expansion, at least 10% and in another embodiment at least 20%.
Typically, the inner lining pipe 7 is expanded so much that the final outer dimension is essentially equal to the inner circumference of the pipe 8 to be lined.
To obtain good mechanical strength for the inner lining pipe, the in- crease in the outer dimension from the original outer dimension, in other words, the radial orientation, must take place at the correct temperature. If the temperature is too low, cracking occurs on the wall of the inner lining pipe, which weakens the mechanical properties of the inner lining pipe. If the expansion takes place at too high a temperature, the orientation does not form evenly and the material wall may even weaken. Therefore, the orientation must take place at a temperature of 60 to 1 10°C, for example. In an embodiment, the temperature is at least 70°C, and in yet another embodiment, over 80°C. In yet another embodiment, the orientation takes place at a temperature of 90 to 100°C.
The inner lining pipe is formed of mainly polyvinyl chloride PVC. In addition to polyvinyl chloride, different additives may be mixed with the material. One example of the composition of the inner lining material is as follows:
100 parts polyvinyl chloride PVC
3 to 10 parts filler
1 to 4 parts stabilizer
0.1 to 1 part lubricant
0 to 8 parts co-stabilizer
0 to 5 parts process auxiliary agent
0 to 8 parts plasticizer. The filler may be one or more of the following: calcium carbonate
CaCO3, talcum, wollastonite, and any other filler known per se, such as a mineral-based filler.
The stabilizer may be one or more of the following: calcium-zinc stabilizer, tin stabilizer, organic stabilizer, and any other stabilizer known per se.
The lubricant may be one or more of the following: paraffin wax, stearic acid, polyethylene wax, and any other lubricant known per se.
The co-stabilizer may be one or more of the following: antioxidant, epoxidized soybean oil, and any other co-stabilizer known per se.
The process auxiliary agent may be one or more of the following: calcium stearate, acryl process auxiliary agent, and any other process auxiliary agent known per se.
The plasticizer may be a polymer plasticizer, a monomer plasticizer, or a mixture thereof. Thus, the plasticizer may be one or more of the following: urethane, such as thermoplastic polyurethane (TPU), acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / bu- tadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, citrate plasticizer, and any other plasticizer known per se. In an embodiment, the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), nitrile, chlo- rinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer and citrate plasticizer.
The plasticizer is used to facilitate the handling of the manufactured pipe. The plasticizer improves the flexibility of the pipe, whereby the installation of the pipe is easier and the installation temperature need not be high. On the other hand, the use of the plasticizer makes it more difficult to achieve sufficiently good pressure resistance for the pipe. Therefore, in an embodiment, 8 parts plasticizer or less is used for 100 parts polyvinyl chloride.
Further, in an embodiment, in which 8 parts plasticizer or less is used for 100 parts polyvinyl chloride, the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
In another embodiment, in which 8 parts plasticizer or less is used for 100 parts polyvinyl chloride, the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rub- ber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer, wherein the amount of acryl is less than 3 parts.
In a further embodiment, in which 8 parts plasticizer or less is used for 100 parts polyvinyl chloride, the plasticizer is one or more of the following: urethane, such as thermoplastic polyurethane (TPU), nitrile, chlorinated poly- ethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
In a further embodiment, in the inner lining material the total amount of acryl is less than 3 parts.
In this specification part refers to weight fraction. In some cases, the features described in this specification may be used as such, regardless of other features. On the other hand, the features described in this specification may also be combined to provide various combinations as necessary.
The drawings and the relating description are only intended to illustrate the idea of the invention. Details of the invention may vary within the scope of the claims.
It is also possible to arrange an insulation layer outside the inner lining pipe. Such an insulation layer facilitates the heating that takes place inside the inner lining pipe. Further, the insulation layer prevents the inner lining pipe from cooling, so that for example the cold seeping from the ground during installation does not cool the inner lining pipe too much. This external insulation may be made of softened polyvinyl chloride foam, for instance. The external insulation layer does not necessarily need to be fastened to the inner layer of the inner lining pipe.

Claims

Claims
1. A method for lining an existing pipe on the inside, comprising: forming an inner lining pipe (7) of mainly polyvinyl chloride with a certain original outer dimension that is smaller than the inner circumference of an existing pipe (8) to be lined,
placing the inner lining pipe (7) inside the pipe (8) to be lined, and expanding the inner lining pipe (7) in such a manner that the original outer dimension becomes larger by causing a radial orientation into the wall material of the inner lining pipe (7).
2. The method of claim 1, characterised by
forming the inner lining pipe (7) originally into a round cross- sectional shape,
decreasing the outer dimensions of the inner lining pipe (7) having a round cross-sectional shape and said original outer dimension at a tempera- ture, in which the inner lining pipe (7) material keeps a memory of the original round shape and size, before the inner lining pipe (7) is installed inside the existing pipe (8), and
heating the inner lining pipe (7) when it is inside the existing pipe (8) to be lined in such a manner that under the influence of the material memory, the inner lining pipe (7) returns essentially to its original round shape and size.
3. A method as claimed in claim 1 or 2, characterised by pre-heating the inner lining pipe (7) before installing it inside the existing pipe (8) to facilitate the handling of the inner lining pipe (7).
4. A method as claimed in any one of the preceding claims, char- a c t e r i s e d by
expanding the inner lining pipe (7) from its original outer dimension by at least 10%, preferably by at least 20%.
5. A method as claimed in any one of the preceding claims, characterised by
forming the wall material of the inner lining pipe (7) in such a manner that it has eight parts or less plasticizer to 100 parts polyvinyl chloride.
6. A method as claimed in any one of the preceding claims, characterised by
forming the wall material of the inner lining pipe (7) by using a plas- ticizer that is one or more of the following: urethane, acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / bu- tadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
7. A method as claimed in any one of claims 1 to 5, character- is e d by
forming the wall material of the inner lining pipe (7) by using a plasticizer that is one or more of the following: urethane, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
8. A method as claimed in any of the preceding claims, characterised by forming the wall material of the inner lining pipe (7) such that the total amount of acryl is less than 3 parts.
9. An inner lining pipe that is intended to be arranged inside an existing pipe (8), wherein the inner lining pipe (7) has an original outer dimension that is smaller than the inner circumference of the existing pipe (8) to be lined, and the inner lining pipe (7) is expandable to have a larger outer dimension than its original outer dimension so that a radial orientation is formed in the wall material of the inner lining pipe (7).
10. An inner lining pipe as claimed in claim 9, characterised in that
the wall material of the inner lining pipe (7) has eight parts or less plasticizer to 100 parts polyvinyl chloride.
11. An inner lining pipe as claimed in claim 9 or 10, character- is e d in that
the wall material of the inner lining pipe (7) has a plasticizer that is one or more of the following: urethane, acryl, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
12. An inner lining pipe as claimed in claim 9 or 10, character- is e d in that
the wall material of the inner lining pipe (7) has a plasticizer that is one or more of the following: urethane, nitrile, chlorinated polyethylene, synthetic rubber, ethyl vinyl acetate copolymer, acryl nitrile / butadiene polymer, nitrile butyl rubber, ethylene propylene diene monomer rubber, phthalate plasticizer, adipate plasticizer, and citrate plasticizer.
13. An inner lining pipe as claimed in any one of claims 9 to 12, characterised in that
in the wall material of the inner lining pipe (7) the total amount of acryl is less than 3 parts.
EP12786970.9A 2011-11-11 2012-11-09 Method for lining existing pipe on inside and inner lining pipe Withdrawn EP2776231A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20116119 2011-11-11
FI20125106A FI126261B (en) 2011-11-11 2012-02-01 Method for internal lining of an existing tube and an inner lining tube
PCT/EP2012/072292 WO2013068544A1 (en) 2011-11-11 2012-11-09 Method for lining existing pipe on inside and inner lining pipe

Publications (1)

Publication Number Publication Date
EP2776231A1 true EP2776231A1 (en) 2014-09-17

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EP12786970.9A Withdrawn EP2776231A1 (en) 2011-11-11 2012-11-09 Method for lining existing pipe on inside and inner lining pipe

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EP (1) EP2776231A1 (en)
FI (1) FI126261B (en)
RU (1) RU2014121780A (en)
SG (1) SG11201402238YA (en)
WO (1) WO2013068544A1 (en)

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CN104629221B (en) * 2015-02-27 2017-02-01 北京创源市政建设工程有限公司 Polyvinyl chloride (PVC) lining pipe
US10494519B2 (en) * 2017-11-17 2019-12-03 Contitech Usa, Inc. CPE based welding hose
CN111777824B (en) * 2019-04-03 2022-03-29 北京创源市政建设工程有限公司 Windable PVC lining pipe, preparation thereof and trenchless pipeline repairing process using same
CN114752156A (en) * 2022-01-05 2022-07-15 杰瑞高科(广东)有限公司 Thermoplastic forming pipeline trenchless repairing material and preparation method and application thereof

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WO2013068544A1 (en) 2013-05-16
FI126261B (en) 2016-09-15
RU2014121780A (en) 2015-12-20
SG11201402238YA (en) 2014-09-26

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