CA2291821A1 - Apparatus and method for lining of passageways - Google Patents
Apparatus and method for lining of passageways Download PDFInfo
- Publication number
- CA2291821A1 CA2291821A1 CA002291821A CA2291821A CA2291821A1 CA 2291821 A1 CA2291821 A1 CA 2291821A1 CA 002291821 A CA002291821 A CA 002291821A CA 2291821 A CA2291821 A CA 2291821A CA 2291821 A1 CA2291821 A1 CA 2291821A1
- Authority
- CA
- Canada
- Prior art keywords
- inflatable tube
- heat curable
- liner
- conduit
- securement members
- 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.)
- Abandoned
Links
Classifications
-
- 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
- B29C63/28—Lining or sheathing of internal surfaces applied by "rubber" bag or diaphragm
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
- B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
- B29C33/505—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
-
- 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
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
- B29C33/14—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Pipe Accessories (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A method and apparatus for repairing/relining a conduit (c) wherein a heat curable lining (10) in a folded condition is placed about an inflatable tube (32), the heat curable lining (10) being held in place by securement members (24) with means (26) for subsequently releasing the securement members (24), placing the inflatable tube (32) within the conduit (c) and pumping hot fluid into the inflatable tube (32) to bring the heat curable lining (10) into contact within interior surface of the conduit (c) and maintaining the pressure for a period of time sufficient to effect a cure of the lining (10) and then deflating and withdrawing the inflatable tube. The lining does not adhere to the conduit.
Description
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APPARATUS AND METHOD FOR REPAIR OF CONDUITS
The present invention relates to a method and an apparatus and more particularly, relates to a method and an apparatus for lining a conduit thereby creating a new conduit having structural integrity along its entire length.
The deterioration of conduits is a well known problem and such conduits may include sewer lines, telephone conduits, water supply conduits, other utility conduits, etc. Generally, these conduits are underground and accordingly, access to the conduits to repair them is both difficult and expensive. Frequently, in order to access the conduits, vegetation such as trees must be removed and in urban areas, roads, sidewalks, and the like must be removed.
Accordingly, it is highly advantageous to repair the conduits rather than to excavate them for repair or replacement.
It is known in the art to repair the conduits by introducing into the conduit an inflatable member which is coated with a repair material and then proceed to inflate the inflatable member with hot air. The repair material bonds to the interior of the conduit and the heat then starts the curing process. Such a method is shown in Canadian Patent
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APPARATUS AND METHOD FOR REPAIR OF CONDUITS
The present invention relates to a method and an apparatus and more particularly, relates to a method and an apparatus for lining a conduit thereby creating a new conduit having structural integrity along its entire length.
The deterioration of conduits is a well known problem and such conduits may include sewer lines, telephone conduits, water supply conduits, other utility conduits, etc. Generally, these conduits are underground and accordingly, access to the conduits to repair them is both difficult and expensive. Frequently, in order to access the conduits, vegetation such as trees must be removed and in urban areas, roads, sidewalks, and the like must be removed.
Accordingly, it is highly advantageous to repair the conduits rather than to excavate them for repair or replacement.
It is known in the art to repair the conduits by introducing into the conduit an inflatable member which is coated with a repair material and then proceed to inflate the inflatable member with hot air. The repair material bonds to the interior of the conduit and the heat then starts the curing process. Such a method is shown in Canadian Patent
2,059,643.
It is also known in the art from World Patent 93/16320 to supply a lining tube impregnated with curable synthetic resin and which surrounds an inflatable bladder, the bladder in turn surrounding a core pipe through which a medium flowing in the pipeline or passageway can pass during the lining operation. The medium is preferably air.
World Patent 88/01707 also discloses a method and apparatus for lining a conduit wherein an inflatable bladder has an additional pipe therein for supplying heat to the air. This in turn speeds up the curing time.
Generally, the inflatable members have been formed of a rubber material and have been inflated using hot air.
AMENDED SHE1:T
CA 02291821 1999-11-29 ,., lA
' The conduit itself may be formed of many different types of materials including metal, brick, concrete, etc. The invention may be practiced with a conduit formed of any such material.
Other means to repair conduits include the use of sprays and the like.
Generally, the spraying of epoxies and polyurethane linings has been practiced. However, the spraying of a lining can not correct structural integrity problems in a conduit.
While the above methods do provide for means of repairing conduits, generally they have been considered unsuitable for repairs in many applications such as the use of spot repairs or for repair of conduit sections of variable lengths and diameters.
AMEf~DED SHEET
It is therefore an object of the present invention to provide a method and apparatus for - the repair of conduits which is both flexible in its use and economical.
It is a further object of the present invention to provide a method and apparatus for lining underground conduits and which method and apparatus may be practiced to reline conduits of various lengths.
According to one aspect of the present invention, there is provided a method for the repair of a conduit, the method comprising the steps of providing an inflatable tube having an exterior diameter substantially equal to an interior diameter of the conduit, placing a heat curable liner having a non adherent outer layer in a folded condition about the inflatable tube, placing the inflatable tube having the heat curable liner thereabout within the conduit, pumping a liquid into the inflatable tube to inflate the inflatable tube and bring the heat curable liner into contact with an interior surface of the conduit and maintaining the pressure and temperature of the liquid for a period of time sufficient to effect a curing of the liner, deflating the inflatable tube, and withdrawing the inflatable tube.
In a preferred aspect, the method includes the steps of securing the heat curable liner about the inflatable tube with a plurality of securement members, providing means for releasing the securement members, and activating the means for releasing the securement members.
In accordance with a further aspect of the present invention, there is provided a setup for the repair of a conduit, the setup comprising an elongated cylindrical inflatable tube, a heat curable liner extending about the inflatable tube, the heat ~IIUE~~JED SH;_ curable liner having at least one inwardly extending U-shaped fold therein, a plurality of securement members extending around the folded heat curable liner, means for releasing the securement members being associated with each securement member, and means for supplying a liquid to the interior of the inflatable tube.
In accordance with a further aspect of the present invention, there is provided a device for use in placing a liner in the interior of a conduit for repair of the same, the device comprising an elongated inflatable tube having first and second ends with first and second end caps, the inflatable tube having an inner layer and an outer layer, the inner layer being formed of a polymeric material such as polyethylene, the outer layer being formed of a plastic material such as polyester having release characteristics on an outer surface thereof, an intermediate reinforcing layer adjacent the first and second ends, the first end cap having means therein to permit the introduction of a liquid to the inflatable tube, and a cable attached to the first and second ends and passing therebetween.
In greater detail, the present invention may be used for the repair/relining of conduits of many different types including conduits for the supply of water, sewers, underground utility conduits, etc. The method may be practiced both for short sections or indeed, for relatively long portions of a conduit.
The heat curable liner is preferably contained in an envelope, with an outer layer (the portion which will subsequently lie adjacent to the interior face of the old conduit) being formed of a polymeric material and preferably, of a polyethylene material.
Many such suitable polyethylene materials are known in the art. An interior portion of the envelope may likewise be formed of a plastics material with many such plastic materials being known to those knowledgeable in the art. A preferred material is a layer of a polyester to provide a smooth finish.
p~AEIVDED SHEET
_ CA 02291821 1999-1~1-29 .
Intermediate the inner and outer layers is the heat curable material. Again, many such materials are known in the art with a preferred material being a plurality of fiberglass liners which are saturated with a heat curable material such as an epoxy material.
Such epoxy materials are known in the art and preferably comprise a 100% solids content and which is curable by the application of heat.
The inflatable tube, as aforementioned, is also preferably formed of at least first and second layers of a suitable plastic material. The tube is adapted to be inflated by a hot fluid and typically hot water.
The heat curable liner is placed in a folded condition about the inflatable tube and preferably is placed such that there is an inwardly extending U-shaped fold therein.
Subsequently, the heat curable liner is held in place about the inflatable tube and to this end, a plurality of securement members may be placed thereabout.
When the tube is inflated, the securement members must be designed to release to permit the full expansion of the tube. As will be appreciated, there can be several different methods of doing this including attachments which release prior to the full pressure being achieved or alternatively, there may be provided separate means for releasing the securement members.
The heat curable liner and inflatable tube are then placed within the conduit to be repaired. Again, equipment known to accomplish the same may be utilized.
Typically, manholes or the like are provided for accessing the conduit.
When the securement members are released manually, means are provided for doing so and such is accomplished when the heat curable liner and inflatable tube are in position. Subsequently, the inflatable tube is inflated by pumping hot water into AMtNDi=p SHEET
".
the tube. In this respect, the volume of water necessary to ensure the full inflation of the tube can be calculated and by so doing, one can avoid the trapping of any air.
When the hot water is pumped into the inflatable tube, the heat curable liner is forced outwardly into contact with the interior surface of the conduit. Due to the outer layer, it does not bond to the interior surface of the conduit; rather, the interior surface of the conduit serves as a structural portion of the assembly following curing of the liner as will be shown in greater detail hereinbelow. The flow of hot water at the desired temperature is maintained for the period of time necessary to cure the liner.
After curing, the inflatable tube may be deflated and withdrawn for reuse.
In the case of a conduit wherein outlets are provided (such as a water conduit) one may provide openings in the liner for a resin to be applied thereabout to fill any cavities.
Having thus generally described the invention, reference will be made to the accompanying drawings illustrating an embodiment thereof, in which:
Figure 1 is a perspective view of a heat curable liner being placed about an inflatable tube;
Figure 2 illustrates the folding of the heat curable liner in position;
Figure 3 illustrates the setup with a U-shaped fold;
Figure 4 is a perspective view illustrating the heat curable liner about the inflatable tube as it would be placed in a conduit to be relined;
Figure 5 is a side elevational view of the setup in place in a conduit;
Figure 6 is a view similar to Figure 5 illustrating the inflation of the device;
~v~n~P~.:t~ s~'~T
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o Figure 7 is a side sectional view illustrating the fimctioning of the liner in a conduit which has been repaired; and Figure 8 is a side sectional view illustrating the construction of the inflatable tube.
Referring to the drawings in greater detail and by reference characters thereto, Figure 1 illustrates a heat curable liner 10 being placed about an inflatable tube 32.
Heat curable liner 10 is comprised of an outer plastic layer 12, an intermediate epoxy impregnated fiberglass layer 14 and an inner plastic layer 16. It will be noted that there is provided an overlap portion 18 of outer plastic layer 12 to assure that the entire inner surface of the conduit to be repaired will be covered as will be discussed in greater detail hereinbelow.
Also, it will be noted that outer plastic layer 12 has a length slightly less than the length of fiberglass layer 14 to thereby provide end portions 20 which permit the adherence at the ends of the liner to the conduit to be repaired.
As shown in Figure 2, heat curable liner 10 is then placed around inflatable tube 32.
In preparing for the placement of the setup in a conduit, heat curable liner 10 is folded to have a U-shaped fold 28 and subsequently paper tape securement members 24 are placed thereabout. A rip release cord 26 may be secured to an end of the inflatable tube 32 and is placed under paper tape securement members 24 and brought back such that a pulling of rip release cord 26 will sever paper tape securement members 24.
A schematic illustration of inflatable tube 32 is provided in Figure 8 and will now be referred to. Inflatable tube 32 has a wall 36 extending between end caps 34 pp~~ND~D S+i~~T
a ' ' .. .
which provide a sealing for the tube. Wall 36 is comprised of an inner tube layer 40 and an outer tube layer 42 with a reinforcing layer 44 being provided adjacent end caps 34.
Reinforcing layer 44 is provided where pressure will be exerted without the benefits of the conduit wall as a backing. Reinforcing layer 44 may be made of any suitable material such as Kevlar TM or the like. Suitable means (not shown) such as adhesives or clamps may be provided at the ends to maintain the layers and end caps in position.
A cable 48 extends through end caps 34 and in the interior may be provided with a cable lining 50 to prevent damage to inner tube layer 40.
At one end of inflatable tube 32 there is provided a water inlet tube 52 which extends to an opposed end while there is also provided a water outlet tube 54.
As shown in Figure 5, the heat setup of Figure 3 is placed in position using cables 48.
Subsequently, rip release cord 26 is utilized to sever tape securement members 24.
Upon inflation, as shown in Figure 6, a heat curable liner 10 is placed in position adjacent an interior surface of conduit C. The water is maintained at a temperature suffcient to cure heat curable liner 10.
As shown in Figure 7, even when there is a break and/or subsequent movement in a conduit wall 30, the use of the two plastic layers and the epoxy saturated fiberglass layers permits a certain degree of movement and flexibility such that leakage will not occur.
AMENDED SHEET
It is also known in the art from World Patent 93/16320 to supply a lining tube impregnated with curable synthetic resin and which surrounds an inflatable bladder, the bladder in turn surrounding a core pipe through which a medium flowing in the pipeline or passageway can pass during the lining operation. The medium is preferably air.
World Patent 88/01707 also discloses a method and apparatus for lining a conduit wherein an inflatable bladder has an additional pipe therein for supplying heat to the air. This in turn speeds up the curing time.
Generally, the inflatable members have been formed of a rubber material and have been inflated using hot air.
AMENDED SHE1:T
CA 02291821 1999-11-29 ,., lA
' The conduit itself may be formed of many different types of materials including metal, brick, concrete, etc. The invention may be practiced with a conduit formed of any such material.
Other means to repair conduits include the use of sprays and the like.
Generally, the spraying of epoxies and polyurethane linings has been practiced. However, the spraying of a lining can not correct structural integrity problems in a conduit.
While the above methods do provide for means of repairing conduits, generally they have been considered unsuitable for repairs in many applications such as the use of spot repairs or for repair of conduit sections of variable lengths and diameters.
AMEf~DED SHEET
It is therefore an object of the present invention to provide a method and apparatus for - the repair of conduits which is both flexible in its use and economical.
It is a further object of the present invention to provide a method and apparatus for lining underground conduits and which method and apparatus may be practiced to reline conduits of various lengths.
According to one aspect of the present invention, there is provided a method for the repair of a conduit, the method comprising the steps of providing an inflatable tube having an exterior diameter substantially equal to an interior diameter of the conduit, placing a heat curable liner having a non adherent outer layer in a folded condition about the inflatable tube, placing the inflatable tube having the heat curable liner thereabout within the conduit, pumping a liquid into the inflatable tube to inflate the inflatable tube and bring the heat curable liner into contact with an interior surface of the conduit and maintaining the pressure and temperature of the liquid for a period of time sufficient to effect a curing of the liner, deflating the inflatable tube, and withdrawing the inflatable tube.
In a preferred aspect, the method includes the steps of securing the heat curable liner about the inflatable tube with a plurality of securement members, providing means for releasing the securement members, and activating the means for releasing the securement members.
In accordance with a further aspect of the present invention, there is provided a setup for the repair of a conduit, the setup comprising an elongated cylindrical inflatable tube, a heat curable liner extending about the inflatable tube, the heat ~IIUE~~JED SH;_ curable liner having at least one inwardly extending U-shaped fold therein, a plurality of securement members extending around the folded heat curable liner, means for releasing the securement members being associated with each securement member, and means for supplying a liquid to the interior of the inflatable tube.
In accordance with a further aspect of the present invention, there is provided a device for use in placing a liner in the interior of a conduit for repair of the same, the device comprising an elongated inflatable tube having first and second ends with first and second end caps, the inflatable tube having an inner layer and an outer layer, the inner layer being formed of a polymeric material such as polyethylene, the outer layer being formed of a plastic material such as polyester having release characteristics on an outer surface thereof, an intermediate reinforcing layer adjacent the first and second ends, the first end cap having means therein to permit the introduction of a liquid to the inflatable tube, and a cable attached to the first and second ends and passing therebetween.
In greater detail, the present invention may be used for the repair/relining of conduits of many different types including conduits for the supply of water, sewers, underground utility conduits, etc. The method may be practiced both for short sections or indeed, for relatively long portions of a conduit.
The heat curable liner is preferably contained in an envelope, with an outer layer (the portion which will subsequently lie adjacent to the interior face of the old conduit) being formed of a polymeric material and preferably, of a polyethylene material.
Many such suitable polyethylene materials are known in the art. An interior portion of the envelope may likewise be formed of a plastics material with many such plastic materials being known to those knowledgeable in the art. A preferred material is a layer of a polyester to provide a smooth finish.
p~AEIVDED SHEET
_ CA 02291821 1999-1~1-29 .
Intermediate the inner and outer layers is the heat curable material. Again, many such materials are known in the art with a preferred material being a plurality of fiberglass liners which are saturated with a heat curable material such as an epoxy material.
Such epoxy materials are known in the art and preferably comprise a 100% solids content and which is curable by the application of heat.
The inflatable tube, as aforementioned, is also preferably formed of at least first and second layers of a suitable plastic material. The tube is adapted to be inflated by a hot fluid and typically hot water.
The heat curable liner is placed in a folded condition about the inflatable tube and preferably is placed such that there is an inwardly extending U-shaped fold therein.
Subsequently, the heat curable liner is held in place about the inflatable tube and to this end, a plurality of securement members may be placed thereabout.
When the tube is inflated, the securement members must be designed to release to permit the full expansion of the tube. As will be appreciated, there can be several different methods of doing this including attachments which release prior to the full pressure being achieved or alternatively, there may be provided separate means for releasing the securement members.
The heat curable liner and inflatable tube are then placed within the conduit to be repaired. Again, equipment known to accomplish the same may be utilized.
Typically, manholes or the like are provided for accessing the conduit.
When the securement members are released manually, means are provided for doing so and such is accomplished when the heat curable liner and inflatable tube are in position. Subsequently, the inflatable tube is inflated by pumping hot water into AMtNDi=p SHEET
".
the tube. In this respect, the volume of water necessary to ensure the full inflation of the tube can be calculated and by so doing, one can avoid the trapping of any air.
When the hot water is pumped into the inflatable tube, the heat curable liner is forced outwardly into contact with the interior surface of the conduit. Due to the outer layer, it does not bond to the interior surface of the conduit; rather, the interior surface of the conduit serves as a structural portion of the assembly following curing of the liner as will be shown in greater detail hereinbelow. The flow of hot water at the desired temperature is maintained for the period of time necessary to cure the liner.
After curing, the inflatable tube may be deflated and withdrawn for reuse.
In the case of a conduit wherein outlets are provided (such as a water conduit) one may provide openings in the liner for a resin to be applied thereabout to fill any cavities.
Having thus generally described the invention, reference will be made to the accompanying drawings illustrating an embodiment thereof, in which:
Figure 1 is a perspective view of a heat curable liner being placed about an inflatable tube;
Figure 2 illustrates the folding of the heat curable liner in position;
Figure 3 illustrates the setup with a U-shaped fold;
Figure 4 is a perspective view illustrating the heat curable liner about the inflatable tube as it would be placed in a conduit to be relined;
Figure 5 is a side elevational view of the setup in place in a conduit;
Figure 6 is a view similar to Figure 5 illustrating the inflation of the device;
~v~n~P~.:t~ s~'~T
_. , , -' r, ., <:
i . , ~'. ., n c ..
o Figure 7 is a side sectional view illustrating the fimctioning of the liner in a conduit which has been repaired; and Figure 8 is a side sectional view illustrating the construction of the inflatable tube.
Referring to the drawings in greater detail and by reference characters thereto, Figure 1 illustrates a heat curable liner 10 being placed about an inflatable tube 32.
Heat curable liner 10 is comprised of an outer plastic layer 12, an intermediate epoxy impregnated fiberglass layer 14 and an inner plastic layer 16. It will be noted that there is provided an overlap portion 18 of outer plastic layer 12 to assure that the entire inner surface of the conduit to be repaired will be covered as will be discussed in greater detail hereinbelow.
Also, it will be noted that outer plastic layer 12 has a length slightly less than the length of fiberglass layer 14 to thereby provide end portions 20 which permit the adherence at the ends of the liner to the conduit to be repaired.
As shown in Figure 2, heat curable liner 10 is then placed around inflatable tube 32.
In preparing for the placement of the setup in a conduit, heat curable liner 10 is folded to have a U-shaped fold 28 and subsequently paper tape securement members 24 are placed thereabout. A rip release cord 26 may be secured to an end of the inflatable tube 32 and is placed under paper tape securement members 24 and brought back such that a pulling of rip release cord 26 will sever paper tape securement members 24.
A schematic illustration of inflatable tube 32 is provided in Figure 8 and will now be referred to. Inflatable tube 32 has a wall 36 extending between end caps 34 pp~~ND~D S+i~~T
a ' ' .. .
which provide a sealing for the tube. Wall 36 is comprised of an inner tube layer 40 and an outer tube layer 42 with a reinforcing layer 44 being provided adjacent end caps 34.
Reinforcing layer 44 is provided where pressure will be exerted without the benefits of the conduit wall as a backing. Reinforcing layer 44 may be made of any suitable material such as Kevlar TM or the like. Suitable means (not shown) such as adhesives or clamps may be provided at the ends to maintain the layers and end caps in position.
A cable 48 extends through end caps 34 and in the interior may be provided with a cable lining 50 to prevent damage to inner tube layer 40.
At one end of inflatable tube 32 there is provided a water inlet tube 52 which extends to an opposed end while there is also provided a water outlet tube 54.
As shown in Figure 5, the heat setup of Figure 3 is placed in position using cables 48.
Subsequently, rip release cord 26 is utilized to sever tape securement members 24.
Upon inflation, as shown in Figure 6, a heat curable liner 10 is placed in position adjacent an interior surface of conduit C. The water is maintained at a temperature suffcient to cure heat curable liner 10.
As shown in Figure 7, even when there is a break and/or subsequent movement in a conduit wall 30, the use of the two plastic layers and the epoxy saturated fiberglass layers permits a certain degree of movement and flexibility such that leakage will not occur.
AMENDED SHEET
Claims (21)
- I CLAIM:
A method for the repair of a conduit (C), said method comprising the steps of providing an inflatable tube (32) having an exterior diameter substantially equal to an interior diameter of said conduit (C), said inflatable tube (32) having first and second ends with first and second end caps (34) sealing said first and second ends, and a reinforcing cable (48) attached to and extending between said end caps (34);
placing a heat curable liner ( 10) having an outer layer (12) of a non adherent material in a folded condition about said inflatable tube (32);
placing said inflatable tube (32) having said heat curable liner thereabout within said conduit (C);
pumping a liquid into said inflatable tube (32) to inflate said inflatable tube and place said reinforcing cable (48) in tension and bring said heat curable liner (10) into contact with an interior surface of said conduit (C) and maintaining said liquid at a temperature and pressure for a period of time sufficient to effect a curing of said liner;
deflating said inflatable tube (32); and withdrawing said inflatable tube (32). - 2. The method of Claim 1 wherein the step of placing a heat curable liner (10) in a folded condition about said inflatable tube comprises the step of placing a heat curable cylindrical liner about said tube and folding said heat curable liner to have an inwardly extending U-shaped fold (28) therein.
- 3. The method of Claim 1 further including the steps of securing said heat curable liner (10) about said inflatable tube with a plurality of securement members (24), providing means (26) for releasing said securement members (24), and activating said means (26) for releasing said securement members (24).
- 4. The method of Claim 2 wherein said step of securing said heat curable liner about said inflatable tube with a plurality of securement members comprises placing a plurality of paper tape members (24) about said folded heat curable liner and wherein the step of providing means for releasing said securement members comprises the step of placing a continuously extending ripcord (26) under said paper tape members (24) and bringing said cord back exteriorly of said paper tape members such that pulling of an end of said cord will cut said securement members.
- The method of Claim 1 wherein the step of pumping a liquid into said inflatable tube comprises the step of pumping heated water therein.
- 6. The method of Claim 5 further including the step of initially pumping a predetermined volume of water into said inflatable tube (32) to ensure that said inflatable tube is completely inflated without any air pockets therein.
- 7. The method of Claim 5 including the step of continuously pumping heated water into said inflatable tube (32) to ensure the maintenance of a desired temperature.
- 8. The method of Claim 7 wherein said heated water is pumped into said inflatable tube (32) proximate one end thereof and said heated water is withdrawn at a second end remote therefrom.
- 9. The method of Claim 1 wherein said heat curable liner includes a fibrous member (14) embedded with a heat curable epoxy material.
- 10. The method of Claim 1 wherein said heat curable liner comprises an inner layer of a plastics material (15), an outer layer (12) of a polymeric material, and an intermediate layer (14) comprises a plurality of fibrous layers impregnated with a heat curable epoxy.
- 11. The method of Claim 10 wherein said intermediate layer extends beyond said outer layer at each end of said liner to permit said intermediate layer to bond to said conduit.
- 12. The method of Claim 10 wherein said inner layer is polyester.
- 13. The method of Claim 12 wherein said outer layer is polyethylene.
- 14. The method of Claim 13 wherein said intermediate layer comprises a plurality of layers of fiberglass impregnated with an epoxy resin.
- 15. A setup for the repair of a conduit (C), said setup comprising an elongated cylindrical inflatable tube (32) having first and second ends, first and second end caps (34) sealing said first and second ends, a reinforcing cable (48) attached to said first and second end caps and extending therebetween, a heat curable liner (10) having a non adherent outer layer (12) extending about said inflatable tube, said heat curable liner (10) having at least one inwardly extending U-shaped fold (28) therein, a plurality of securement members (24) extending around said folded heat curable liner, means (26) for releasing said securement members (24) being associated with each securement member, and means (52, 54) for supplying a fluid to the interior of said inflatable tube.
- 16. The setup of Claim 15 wherein said securement members (24) each comprises a paper tape.
- 17. The setup of Claim 16 wherein said means for cutting said securement members comprises a ripcord (26) placed between said heat curable liner and said securement members.
- 18. The setup of Claim 15 wherein said inflatable tube has an inner layer (40) and an outer layer (42), and inlet means (52) and outlet means (54) within at least one of said end caps to permit introduction and withdrawal of a fluid into said inflatable tube.
- 19. The setup of Claim 15 wherein said heat curable liner (10) comprises a plurality of fiberglass layers impregnated with an epoxy resin.
- 20. The setup of Claim 17 wherein said heat curable liner (10) comprises an inner layer (16) of a plastic material, an outer layer (12) of a plastic material, and an intermediate layer (14) of a fiber material impregnated with an epoxy resin.
- 21. A device for use in placing a liner in the interior of a conduit for repair of the same, said device comprising an elongated inflatable tube (32) having first and second ends with first and second end caps (34), said inflatable tube having an inner layer (40) and an outer layer (42), an intermediate reinforcing layer (44) adjacent said first and second ends, said first end cap (34) having means therein to permit the introduction of a fluid to said inflatable tube, and a reinforcing cable (48) attached to said first and second end caps and extending therebetween, said reinforcing cable being in tension when said elongated inflatable tube is in an inflated condition.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9711294.0 | 1997-06-03 | ||
| GBGB9711294.0A GB9711294D0 (en) | 1997-06-03 | 1997-06-03 | Apparatus and method for lining of passageways |
| PCT/CA1998/000554 WO1998055796A1 (en) | 1997-06-03 | 1998-06-03 | Apparatus and method for lining of passageways |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2291821A1 true CA2291821A1 (en) | 1998-12-10 |
Family
ID=10813386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002291821A Abandoned CA2291821A1 (en) | 1997-06-03 | 1998-06-03 | Apparatus and method for lining of passageways |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU7754398A (en) |
| CA (1) | CA2291821A1 (en) |
| GB (1) | GB9711294D0 (en) |
| WO (1) | WO1998055796A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001077569A2 (en) * | 2000-04-05 | 2001-10-18 | Flexfab Horizons International, Inc. | Fluorocarbon repair bladder |
| US6660214B2 (en) * | 2001-02-23 | 2003-12-09 | Essef Corporation | Pressure vessel manufacture method |
| GB2400898A (en) * | 2003-04-25 | 2004-10-27 | Anthony O'donnell | Method and apparatus for repairing a pipe |
| US7849883B2 (en) * | 2005-05-02 | 2010-12-14 | Nuflow Technologies 2000 Inc. | Liner assembly for pipeline repair and methods of installing same |
| US8375972B2 (en) | 2007-10-15 | 2013-02-19 | Lmk Technologies, Llc | Device and method for repairing pipe |
| AU2007231809B2 (en) * | 2007-11-01 | 2015-03-05 | Nu Flow Technologies 2000 Inc. | Liner assembly for pipeline repair and methods of installing same |
| NL1039503C2 (en) * | 2012-03-29 | 2013-12-30 | Wavin Bv | Device and method for installing a compact pipe within a pipeline. |
| GB201614608D0 (en) * | 2016-08-29 | 2016-10-12 | Ecosse Global Uk Ltd | Tubular repair system and method |
| AU2021102901B4 (en) * | 2020-08-14 | 2021-08-26 | Pull In Place Pty Ltd | A bladder assembly and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2728056A1 (en) * | 1977-06-22 | 1979-01-11 | Arikan Geb Kartan Sevinc | Protective lining for inside cement pipes - where tube is fitted inside while folded and then sealed, released and inflated |
| SE454097B (en) * | 1986-09-03 | 1988-03-28 | Byggnads & Industriservice Ab | SET AND DEVICE FOR INTERNAL LINING OF A PASSAGE |
| JPH0723240Y2 (en) * | 1988-09-16 | 1995-05-31 | 日本鋼管株式会社 | Tube used for pipe lined construction method |
| JP2736368B2 (en) * | 1990-04-10 | 1998-04-02 | 芦森工業株式会社 | Pipe liner and pipe line lining method |
| GB9015980D0 (en) * | 1990-07-20 | 1990-09-05 | Inflotech Ltd | Process for reconstructing underground pipes |
| GB9203005D0 (en) * | 1992-02-13 | 1992-03-25 | Insituform Group Ltd | Improvements relating to the lining of pipelines or passageways |
| AUPN511095A0 (en) * | 1995-08-29 | 1995-09-21 | Barry, Kevin Francis Patrick Jr. | Pipe rehabilitation |
-
1997
- 1997-06-03 GB GBGB9711294.0A patent/GB9711294D0/en active Pending
-
1998
- 1998-06-03 AU AU77543/98A patent/AU7754398A/en not_active Abandoned
- 1998-06-03 CA CA002291821A patent/CA2291821A1/en not_active Abandoned
- 1998-06-03 WO PCT/CA1998/000554 patent/WO1998055796A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| GB9711294D0 (en) | 1997-07-30 |
| WO1998055796A1 (en) | 1998-12-10 |
| AU7754398A (en) | 1998-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |