WO2001077570A1 - Ballonnet de reparation comportant un event - Google Patents

Ballonnet de reparation comportant un event Download PDF

Info

Publication number
WO2001077570A1
WO2001077570A1 PCT/US2000/009221 US0009221W WO0177570A1 WO 2001077570 A1 WO2001077570 A1 WO 2001077570A1 US 0009221 W US0009221 W US 0009221W WO 0177570 A1 WO0177570 A1 WO 0177570A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
layer
impermeable
insert
inflatable bladder
Prior art date
Application number
PCT/US2000/009221
Other languages
English (en)
Inventor
Nancy J. Marks
Original Assignee
Flexfab Horizons International, Inc.
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 Flexfab Horizons International, Inc. filed Critical Flexfab Horizons International, Inc.
Priority to AU2000242083A priority Critical patent/AU2000242083A1/en
Priority to PCT/US2000/009221 priority patent/WO2001077570A1/fr
Publication of WO2001077570A1 publication Critical patent/WO2001077570A1/fr

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
    • F16L55/1654—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 invention relates to an inflatable bladder comprising a heating layer encapsulated by one or more air impermeable layers for use in patching a broken underground pipe, and, more specifically, to an inflatable bladder having a breather vent for releasing air between the heating layer and the air-impermeable layers.
  • Inflatable bladders are commonly used to repair breaks or cracks in underground pipes such as sewers.
  • the inflatable bladder typically includes a leading and trailing conduit that is used to pull the bladder within the sewer and position it adjacent the failure in the sewer pipe.
  • a patch material typically comprising activated styrene, is temporarily affixed to the exterior of the bladder prior to positioning the bladder within the sewer. Once the bladder is properly positioned so that the patch is aligned with the pipe failure, the bladder is inflated through one or both of the leading and trailing hoses to press the patch against the failure in the pipe.
  • the patch material is heated to a temperature great enough to affix/cure the patch to the pipe and seal the failure.
  • Current bladders typically comprise a laminate of opposing layers of air- impermeable material, preferably fluorosilicone, between which is positioned a carbon fiber mesh, commonly referred to as a carbon fiber sock, which is electrically conductive.
  • the inflatable bladder terminates in opposing tapered ends on which are mounted end caps that close the ends of the bladder and couple the conduits to the sock.
  • Electrical conductors usually entrained about, forming part of, or contained within the conduits, electrically couple the carbon fiber sock to a source of electrical power.
  • the application of electrical power to the carbon fiber sock generates heat, which heats the air-impermeable layers, resulting in a transfer of the heat to the patch to cure the patch to the sewer pipe.
  • Patent Nos. 5,451,651; 5,648,137; and 5,656,231 all disclose conventional inflatable bladders for patching an underground pipe as described above.
  • a disadvantage of the current inflatable bladders is that, during the inflation process, pressurized air tends to propagate between the air-impermeable layers and the sock by entering the ends of the inflatable bladder at the end caps. The propagating air tends to bubble, which in extreme cases can delaminate the air-impermeable layer from the sock.
  • Such air bubbles can also be large enough to impede deflation of the bladder sufficient to hamper easy removal from the sewer, which increases the likelihood of damage during removal. In extreme cases, a bubble can prevent the removal of the bladder altogether.
  • an inflatable bladder comprising an elongated, tubular body portion (12), defining a hollow interior and having open ends, which are closed by first and second end portions (18, 20). At least one of the tubular body portion, first end portion, and second end portion is made from a laminate comprising air-impermeable outer and inner layers (30, 32) and an electrically conductive intermediate layer (34) positioned between the outer and inner layers.
  • a vent (50) extends from the intermediate layer through one of the inner and outer layers to vent air from the intermediate layer beyond the one of the inner and outer layers.
  • the vent extends from the intermediate layer to the outer layer.
  • the vent is a passageway formed in the one of the inner and outer layers.
  • the passageway is dimensioned such that a portion of the passageway closes when the inflatable bladder is deflated.
  • Either or both of the outer and inner layers can comprise multiple layers.
  • the outer layer is preferable made from fluorosilicone or fluorocarbon.
  • the conductive layer can be made from carbon fiber, preferably a carbon fiber mesh.
  • a strengthening web (72) is disposed between the intermediate layer and the one of the outer
  • the invention also relates to a method for making an inflatable bladder (10) for use in repairing a failure in a pipe.
  • the method comprises: positioning a conductive material (64) on a form (54) in the shape of the bladder to form the conductive layer; positioning an insert (66) on the form such that a portion of the insert is adjacent the conductive layer; positioning an air- impermeable material (52 or 70) about the form to form the air-impermeable layer and such that a portion of the insert extends beyond the air-impermeable material; and removing the insert to create a passage (50) extending from the conductive layer to the exterior of the air- impermeable material.
  • the positioning of the insert occurs prior to the positioning of the air-impermeable layer.
  • the positioning of the air-impermeable material can include the wrapping of a strip of air-impermeable material (52 or 70) about the form.
  • the method can further include the positioning of a strengthening web (72) between the insert and the air-permeable layer.
  • FIG. 1 illustrates a side view of an inflatable bladder with a breather vent according to the invention
  • FIG. 2 is a left end view of the inflatable bladder of FIG. 1 illustrating the exterior opening of the breather vent;
  • FIG. 3 is a sectional view taken along line 3-3 of FIG. 2 and illustrating the breather vent and an electrical coupler;
  • FIG. 4 is an enlarged view of the left end of the bladder of FIG. 4 more clearly illustrating the breather vent and electrical coupler;
  • FIG. 5 is a schematic view of the building of a first air-impermeable layer of the inflatable bladder on a mandrel or tool;
  • FIG. 6 is a schematic view illustrating the buildup of a conductive layer over the first air-impermeable layer of FIG. 5;
  • FIG. 7 is a schematic view illustrating the positioning of an insert on the conductive layer after the buildup of the conductive layer of FIG. 6; and
  • FIG. 8 is a schematic view illustrating the buildup of a second air- impermeable layer about the conductive layer and the insert in combination with the placing of a structural support between the insert and the second air-impermeable layer.
  • FIG. 1 illustrates an inflatable bladder 10 comprising a generally constant diameter middle portion 12 and opposing concentrically tapered end portions 14, 16. Each of the end portions terminates in an opening 18, 20 (FIG. 4) sized to receive a conduit 22, 24, respectively. Couplers 26, 28 close off the openings 18, 20 and connect the corresponding conduit 20, 22 to the appropriate end 14, 16.
  • the inflatable bladder 10 is made from a laminate comprising inner and outer air-impermeable layers 30, 32 between which is positioned an electrically conductive layer 34.
  • the inner and outer air-impermeable layers are made from rubber, such as fluorosilicone or fluorocarbon rubber.
  • the conductive layer 34 preferably is made from carbon fiber, specifically, a sock or cylinder of a carbon fiber mesh.
  • the ends of the carbon fiber sock extend a distance away from the ends of the air-impermeable layers 30, 32.
  • the exposed portions of the carbon fiber sock extending beyond the ends of the air-impermeable layers 30, 32 are electrically coupled to an electrical conduit by the couplers 26, 28.
  • Each of the couplers 26, 28 includes an inner cone 36 and an outer cone 38.
  • the inner cone 36 has an axial opening 40, a clamping surface 42, and an annular angled shoulder 44.
  • the outer cone comprises a clamping surface 48 sized to receive the inner cone clamping surface and the bladder therebetween.
  • the conduit 22 couples to the outer cone 38 and supplies pressurized air to the bladder 10 and electrically couples to the inner cone 38 or conductive layer 34 in the traditional manner.
  • the inner cone 36 is received within the opening 18 and the exposed portions of the carbon fiber sock are wrapped around the base.
  • the outer cone 38 is positioned over the inner cone 36 so that the clamping surfaces 42, 48 compressively trap a portion of the bladder therebetween.
  • a breather vent 50 extends from the conductive layer 34 through the outer air- impermeable layer 32.
  • the breather vent 50 is preferably an opening or passageway in the outer air-impermeable layer 32 that fluidly connects the conductive layer 34 to the exterior of the inflatable bladder 10.
  • the passage has opposing ports, one of which faces the exterior of the bladder, and the other faces the conductive layer.
  • the breather vent 50 is exaggerated for clarity in the drawings.
  • the size of the passageway is such that the passageway will collapse and be self-closing when air is withdrawn from the inflatable bladder 10 during bladder deflation.
  • the breather vent 50 it is within the scope of the invention for the breather vent 50 to have a more complex structure than merely a passageway extending from the conductive layer 34 through the outer air-impermeable layer 32.
  • the passageway could contain a one-way valve or check valve. The check valve would ensure the exhausting or releasing of air propagating between the inner and outer air- impermeable layers 30, 32 along the conductive layer 34 and the closure of the breather vent 50 during deflation.
  • the breather vent 50 could just as easily extend from the conductive layer 34 through the inner air- impermeable layer 30 and into the interior of the inflatable bladder 10.
  • FIG. 5 illustrates the buildup of the inner air-impermeable layer 30, which is preferably created by wrapping a strip 52 of air- impermeable material about a mandrel or tool 54.
  • the tool 54 has an exterior shape corresponding to the desired finished exterior shape of the inflatable bladder 10.
  • the tool 54 has a substantially constant diameter middle portion 56 with concentrically tapered ends 58, 60, from which extend projections 62, 64, which form the end of openings 18, 20 in the inflatable bladder.
  • the buildup of the strip of air-impermeable material 52 about the tool 54 starts, for example, by beginning the wrapping of the strip 52 at one end portion 58, and ending at another end portion 60.
  • multiple strips of air-impermeable material 52 may be wrapped about the tool 54, preferably one strip on top the other.
  • the strips of air- impermeable material 52 are preferably wrapped in a helical-type fashion.
  • the conductive layer 34 is then built on the tool on top of the inner air- impermeable layer 30.
  • the conductive layer 34 is preferably built up on the tool by taking a cylinder or sock 64 of conductive material and sliding it over the strips of air- impermeable material 52 built up on the tool.
  • the sock 64 is of such a length that the ends of the sock extend slightly beyond the ends of the air- impermeable material 52.
  • the sock 64 can be made from a conductive material that is capable of radial stretching or expansion to provide a snug fit relative to the inner air- impermeable layer 30 as the sock 64 is slid over the tool 54.
  • an insert 64 has one portion attached to the sock 64 wherever it is desired to form the breather vent 50.
  • an insert 66 is illustrated.
  • an insert 66 is attached to each end of the sock 64.
  • the insert 66 is preferably a ribbon made from TeflonTM and/or coated with TeflonTM.
  • the outer air-impermeable layer 32 is built up on the tool 54.
  • the outer air-impermeable layer 32 is built up by wrapping a strip of air-impermeable material 70 about the tool 54 on the exterior of the sock 64.
  • the strip of air- impermeable material 70 is wrapped in the same manner as the strip 52, preferably in a helical fashion.
  • the position of the insert 66 is controlled so that the free end of the insert 66 does not become trapped under the strip of air-impermeable material 70, ensuring that the free end of the insert 66 is accessible to the exterior of the bladder after the buildup of the outer air-impermeable layer 32.
  • a support web 72 is positioned on top of the insert 66 at a location at least corresponding to the area where the strip of air-impermeable material 70 overlies the insert 66.
  • the support web 72 is preferably placed over the insert 66 prior to the strip of air-impermeable material 70 being wrapped over the insert 66.
  • the support web 72 provides additional strength to the adjacent portion of the air-impermeable strip 70 and aids in preventing the insert 66 from tearing or cutting the air-impermeable layer 32 when the insert 66 is removed.
  • the support web 72 be positioned at least at the outer layer of the multiple layers of air-impermeable strips 70.
  • the inner and outer air-impermeable layers 30, 32 and the conductive layer 34 are subjected to a curing process, typically heat, for the fluorocarbon and fluorosilicone rubber.
  • a curing process typically heat, for the fluorocarbon and fluorosilicone rubber.
  • a relatively large amount of force must be applied to the insert 66 to remove it from the cured outer air-impermeable layer 32.
  • the support web provides additional structural support to the outer air- impermeable layer 32 along the insert 66 and prevents the tearing of the outer air- impermeable layer 32 in response to the force the insert 66 applies to the outer air- impermeable layer when the insert 66 is pulled.
  • the insert 66 is shown as extending from the conductive layer 34 through the outer air-impermeable layer 32, the insert 66 could just as easily extend from the conductive layer 34 through the inner air-impermeable layer 30. However, such an inwardly directed orientation of the insert 66 would require some modifications to the process.
  • the free end of the insert 66 would extend along the projections 60 of the tool and be wound through the various layers of the inner air-impermeable layer 30 to ensure that the free end of the insert 66 could be grasped and pulled after the curing of the buildup bladder.
  • support web 72 would need to be disposed between the appropriate portions of the air- impermeable strips 50.
  • the cured bladder 10 is removed from the tool by blowing air into one or more of the openings 18, 20 of the ends 14, 16 of the bladder 10.
  • the pressurized air helps to lift the bladder 10 off the tool and enable the bladder to be slid off of the tool.
  • a lubricant can also be used alone or in combination with the pressurized air to enhance the sliding of the bladder off the tool.
  • the inner and outer air-impermeable layers 30, 32 and the conductive layer 34 typically can stretch a sufficient amount to permit the sliding removal of the bladder from the tool 52.
  • the bladder is preferably removed from the tool after the insert 66 is removed. However, the bladder can be removed earlier if desired.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un ballonnet (10) s'utilisant pour réparer un défaut dans un tuyau. Le ballonnet gonflable comporte une partie (12) de corps tubulaire allongé définissant un intérieur creux à extrémités ouvertes, et une première et une deuxième parties (14, 16) d'extrémité. Chaque partie d'extrémité ferme l'une des extrémités ouvertes du corps tubulaire. Le ballonnet est constitué d'un stratifié composé d'une matière interne (30) et externe (32) imperméable à l'air, qui comporte une couche (34) intermédiaire électriquement conductrice située entre celles-ci. Un évent (50) s'étend depuis la couche intermédiaire à travers l'une des couches interne et externe pour purger l'air de la couche intermédiaire.
PCT/US2000/009221 2000-04-07 2000-04-07 Ballonnet de reparation comportant un event WO2001077570A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2000242083A AU2000242083A1 (en) 2000-04-07 2000-04-07 Repair bladder with breather vent
PCT/US2000/009221 WO2001077570A1 (fr) 2000-04-07 2000-04-07 Ballonnet de reparation comportant un event

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/009221 WO2001077570A1 (fr) 2000-04-07 2000-04-07 Ballonnet de reparation comportant un event

Publications (1)

Publication Number Publication Date
WO2001077570A1 true WO2001077570A1 (fr) 2001-10-18

Family

ID=21741245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/009221 WO2001077570A1 (fr) 2000-04-07 2000-04-07 Ballonnet de reparation comportant un event

Country Status (2)

Country Link
AU (1) AU2000242083A1 (fr)
WO (1) WO2001077570A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004059525A1 (de) * 2004-12-09 2006-06-14 Endress + Hauser Flowtec Ag Einzugvorrichtung für eine Rohrauskleidung
EP3670996A1 (fr) * 2018-12-17 2020-06-24 Picote Solutions Inc. Vessie, dispositif de gonflage de la vessie et agencement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451351A (en) * 1991-09-13 1995-09-19 Composite Components, Inc. Method for rehabilitating a pipe with a liner having an electrically conductive layer
US5494106A (en) * 1994-03-23 1996-02-27 Drillflex Method for sealing between a lining and borehole, casing or pipeline
US5560395A (en) * 1994-09-28 1996-10-01 Bissonnette; Roger A. Apparatus and method for repairing underground conduits in situ
US5695008A (en) * 1993-05-03 1997-12-09 Drillflex Preform or matrix tubular structure for casing a well

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451351A (en) * 1991-09-13 1995-09-19 Composite Components, Inc. Method for rehabilitating a pipe with a liner having an electrically conductive layer
US5695008A (en) * 1993-05-03 1997-12-09 Drillflex Preform or matrix tubular structure for casing a well
US5494106A (en) * 1994-03-23 1996-02-27 Drillflex Method for sealing between a lining and borehole, casing or pipeline
US5560395A (en) * 1994-09-28 1996-10-01 Bissonnette; Roger A. Apparatus and method for repairing underground conduits in situ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004059525A1 (de) * 2004-12-09 2006-06-14 Endress + Hauser Flowtec Ag Einzugvorrichtung für eine Rohrauskleidung
EP3670996A1 (fr) * 2018-12-17 2020-06-24 Picote Solutions Inc. Vessie, dispositif de gonflage de la vessie et agencement
WO2020127155A1 (fr) * 2018-12-17 2020-06-25 Picote Solutions Inc. Vessie, dispositif de gonflage de vessie et agencement

Also Published As

Publication number Publication date
AU2000242083A1 (en) 2001-10-23

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