EP0861400A1 - Revetement interieur de conduites - Google Patents

Revetement interieur de conduites

Info

Publication number
EP0861400A1
EP0861400A1 EP96925002A EP96925002A EP0861400A1 EP 0861400 A1 EP0861400 A1 EP 0861400A1 EP 96925002 A EP96925002 A EP 96925002A EP 96925002 A EP96925002 A EP 96925002A EP 0861400 A1 EP0861400 A1 EP 0861400A1
Authority
EP
European Patent Office
Prior art keywords
pipe
tube
film
ofthe
film material
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Withdrawn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
EP96925002A
Other languages
German (de)
English (en)
Inventor
Raymond Connor
Paul Anthony Wilde
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.)
Polytech Research & Development Ltd
Original Assignee
Polytech Research & Development Ltd
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 Polytech Research & Development Ltd filed Critical Polytech Research & Development Ltd
Publication of EP0861400A1 publication Critical patent/EP0861400A1/fr
Withdrawn legal-status Critical Current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
    • F16L55/1651—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 everted
    • 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

  • This invention relates to lining pipes, especially, but by no means essentially, to lining underground small bore pipes such as domestic water and gas supply pipes.
  • Some trenchless methods are subject to inaccuracies in placement ofthe pipe and it is difficult to change direction or manoeuvre around obstacles.
  • PET polyethylene terephthalate
  • Pipes are also relined with epoxy resin by a number of techniques.
  • a spray head is pulled through the pipe.
  • a reservoir of epoxy resin is blown through the pipe by compressed air.
  • Epoxy resin has been applied to gas pipes using a lining pig which is also forced through the pipe by compressed air.
  • a major drawback is the long curing time required - up to sixteen hours - which adds considerably to the down-time.
  • the present invention provides a method for lining pipes which is less expensive, simpler and less time consuming than any of the prior art methods aforementioned, and which has other advantages in its various embodiments as will become clear from what follows.
  • the invention comprises a method for lining a pipe in which a tube of film material is attached at one end ofthe pipe and everted by fluid pressure through the pipe.
  • a similar method has, of course, been employed for a number of years in the structural rehabilitation of sewers.
  • the lining used in that procedure is a heavy-duty thermo setting resin impregnated textile, e.g. polyester fibre felt.
  • the present invention is seen to be an adaption of that technique to the lining of, generally speaking, smaller pipes, often substantially smaller pipes, than the sewers to which the technique is conventionally applied, but using a lining which is quite different not only from the lining used in that technique but also from the linings used hitherto in water and gas pipe rehabilitation.
  • the fluid pressure may be air pressure.
  • air pressure Conventionally, in the tube eversion sewer relining technique, the required pressure is generated by a head of water, although one proposal is to use air pressure in combination with resin impregnation only at the point of eversion as the lining travels down the pipe, air pressure being adequate to evert the lighter, unimpregnated textile material.
  • the tube diameter may be substantially equal to the pipe inner diameter. Whilst this is clearly a requirement for a structural lining as in sewer rehabilitation, it is not an absolute requirement for film linings, where tubes of greater or lesser diameter than the pipe can be successfully everted. It has been found, however, that if the tube diameter is substantially equal to the pipe inner diameter, bends even involving elbow joints which have radial steps, can be successfully negotiated. Thus while it would clearly be possible to use, for example, a polyethylene lay flat film tube of smaller diameter than the pipe and expand it, as with the PET liner referred to above, it is preferred, on account ofthe possibility of negotiating bends with radial steps, to use a lining which is already correctly sized to the pipe.
  • the tube may be supplied as a layflat tube, which can be unwound from a roll to be fed with the pipe.
  • the tube may be supplied in a length - usually at least twice the length of pipe to be lined, but not necessarily so, as will be explained below - which is during the lining operation held inside a pressure chamber supplying the eversion pressure.
  • the pipe When the length of tube is twice that ofthe pipe, the pipe will contain, when the tube has been everted through the full length ofthe pipe, two pipe lengths of tube, one inside the other.
  • the tube may be cut at the remote end ofthe pipe and the inner length withdrawn, or both lengths left inside.
  • the film material may be a polymeric plastic material, which may be a thermoplastic.
  • Polyethylene and polyethylene terephthalate are suitable, especially for lining water and gas pipes.
  • Such pipes are usually buried, so that access is by excavation.
  • the excavation need not be extensive, however, because the equipment used to supply the tube and pressure can be located above ground and a lead-in pipe e.g. a flexible pipe, attached to the pipe to be lined.
  • the lining may in some instances turn out to have a limited life, though certainly adequate in any event as a temporary measure.
  • the lining is of film, if it is sized to the pipe, there is essentially no reduction in pipe inner diameter and therefore carrying capacity.
  • Second and even subsequent lining operations can be carried out either contemporaneously with the first in order to produce a more robust or gas-tight lining or at intervals thereafter in case of wear on the first lining.
  • the pipe ordinarily already contains a double layer. If the eversion pressure is released once the far end has been secured, the inner layer can be pressed against the outer layer by overpressure from the far end and/or underpressure in the original eversion pressure space from the original blowing end.
  • a hardenable foam may be injected into the pipe before or during the lining operation; the foam may be introduced between first and second linings for example into the eversion ofthe first lining. This can give an element of structural support.
  • the method can be used to bridge gaps in broken pipes and can accommodate misaligned sections even if the ends have been separated lengthwise - in fact the method can bridge pipes separated and/or misaligned by up to half a diameter.
  • the invention also comprises apparatus for lining pipes comprising a support for a supply of tubular film material, attachment means adapted to attach an end ofthe tubular material to a pipe to be lined and fluid pressure means adapted to evert the tube through the pipe.
  • the support may comprise a roll support for a roll of layflat tube.
  • the attachment means may comprise a tubular insert or fitting for the pipe between which and the inner wall ofthe pipe the tube can be sealingly clamped.
  • the attachment means may comprise O-ring seals.
  • the support for the supply of tubular material may have feed roller means mediating the feeding ofthe material through the pipe.
  • the support may be enclosed in a pressure chamber, which may have a flexible connector to the pipe allowing it to be situated away from and off the axis ofthe pipe.
  • the apparatus may comprise a foam inlet to the space between the tube and the pipe.
  • Figure 1 is a diagrammatic illustration of a domestic water supply pipe lining operation
  • Figure 2 is a diagrammatic illustration of a first apparatus
  • Figure 3 is a diagrammatic illustration of a second apparatus
  • Figure 4 is a diagrammatic illustration of a third apparatus
  • Figure 5 is an end view of one form of layflat tube for the operation illustrated in Figure 1,
  • Figure 6 is an end view of another form of layflat tube for the operation illustrated in Figure 1, and
  • Figure 7 is a cross-section of one kind of material for the manufacture of tubes as illustrated.
  • the drawings illustrate methods and apparatus for lining pipe 11 such for example as domestic water supply pipe 11 of Figure 1 which may be in need of rehabilitation due to wear, fracture, leakage, internal encrustation or contamination or which may simply be guilty of being made of lead which dangerously contaminates drinking water to levels above those which are now regulated.
  • a tube 12 of film material such as polyethylene or polyethylene terephthalate or a composite material as hereinafter explained is attached at one end 13 ofthe pipe 11 and everted by fluid pressure through the pipe 11.
  • the pipe may be advantageous to fit a transparent extension so that the appearance of the end of the tube can be monitored without allowing the tube to expand freely under the eversion pressure.
  • the extension can be long enough to allow the ingress of a sufficient length of everted tube to give a cuff for folding back over the end ofthe pipe.
  • the pipe 11 runs from a street water main 14 underground to a domestic stop cock 15, typically through two right angle elbow joints 16.
  • the method can be accomplished by accessing the end 13 ofthe pipe below street level through a manhole or by excavation.
  • the domestic stop cock 15 can be regarded as the terminal point of the lining operation for present purposes, but, of course, there is no reason why the operation cannot be carried out on all the pipes in the building, provided that they can be accessed or that branched pipes are accommodated, as will be explained presently.
  • Suction may be applied to the pipe 11 at the stop cock 15 and to assist in the eversion process.
  • suction alone might achieve the eversion process even without the use of fluid overpressure at the tube inlet end - this will typically be the case in relatively short, relatively straight and - above all relatively leak-free pipes.
  • a suction device 10 is shown attached to the stop cock 15 in Figure 1.
  • Figures 2, 3 and 4 illustrate, severally, apparatus for lining pipes 11 comprising a support 17 for a supply of tubular film material 12, attachment means 18 adapted to attach an end 12a ofthe tubular material 12 to a pipe 11 to be lined, and fluid pressure means 19 adapted to evert the tube 12 through the pipe 11.
  • the support 17 is a roll support for a roll of layflat polyethylene or polyethylene terephthalate tube 12.
  • the attachment means 18 comprise a tubular insert for the pipe 11 between which and the inner wall 1 la ofthe pipe 11 the tube 12 can be sealingly clamped with O-ring seals 19.
  • the support 17 has associated feed rollers 21 mediating the feeding ofthe tube 12 through the pipe 11.
  • the rollers 21 are operated so as not to allow any drag of the roll feed arrangement to prevent or hinder the eversion of the tube 12 through the pipe 11, and may have an associated measurement device for the length of tube 12 fed into the pipe 11.
  • the support means 17 are located adjacent - lo ⁇
  • an air delivery block 22 which includes the attachment means 18 and to which is connected a pressure air supply 23.
  • the tube 12 is fed in through a seal 20.
  • Figure 3 shows how the support means are located in a pressure chamber 24 fed by the pressure air supply 23 and supplying the eversion pressure.
  • a hatch (not shown) permits access to the chamber 24 for changing the roll of material 12.
  • the air delivery block 22 could, of course, be located outside the excavation, e.g. on a truck, and connected to the pipe by a flexible hose. This is so for all embodiments.
  • the support 17 may have a brake operative to prevent rotation ofthe roll of film when eversion is held up, e.g. due to a restriction in the pipe 11.
  • Figure 4 illustrates how for larger pipes such as the street main 14 where some additional reinforcement might be desired, a foam injection nozzle 41 is accommodated to inject a hardenable foam between a spigot 42 constituting the tubular insert 18 and an inner spigot 43 with an intervening annulus from which the foam flows.
  • a first lining 12 from one of two roller supports 17 is everted through the pipe 14, then, once that is in place, eversion pressure is released and the lining secured at both ends.
  • a second, smaller diameter,lining from the other ofthe roller supports 17 is then everted through the pipe 14.
  • the inner spigot 43 can be used to anchor the end 12a ofthe tube 12.
  • the second lining When the second lining is fully through the pipe 14 it is held underpressure while foam is injected between the first and second linings or between the eversion and the tail ofthe first lining, the second lining acting as a mould preventing the foam and first lining collapsing inwardly.
  • the layflat tube 12 preferably has a like diameter to the internal diameter ofthe pipe 11, 14. It is found that with a mismatch here, progress ofthe tube eversion down the pipe can be interrupted and pressure can build up which bursts the tube. Straight runs can be accommodated, but curves, especially 90° elbow joints, are best negotiated using closely matched tube and pipe and also when the support means 17 are inside a pressure chamber as illustrated in Figure 3.
  • the production ofthe film essentially involves extruding a tube of molten thermoplastic and continuously inflating it to several times its as-extruded diameter to form a thin tubular product.
  • the term “film” is associated with thicknesses between about 40 and 400 microns.
  • “Blown” film properties are controlled primarily by crystaliinity and molecular weight. Typically the tensile strength increases with density and water vapour transmission rate falls. High molecular weight plastics have improved toughness and impact strength.
  • the inflation or blowing operation induces significant orientation of the polymer molecules, which contributes substantially to strength and stiffness and enhances chemical inertness and barrier properties.
  • Two or more different polymers can be co-extruded.
  • Melt streams can be combined in the extrusion die body or combined outside the due using a feed block.
  • a film material with good barrier properties and chemical inertness can thus be combined with a layer of high stiffness and strength.
  • An adhesive layer can be added (on the inside ofthe extruded tube) for activation once in the pipe, as by heat from a hot water, air or steam flow through the pipe, to adhere the lining to the pipe wall.
  • Figure 7 illustrates a three layer film with a barrier layer 71, a high strength substrate 72 and an adhesive layer 73.
  • Suitable materials for the tube include polyethylene, polypropylene, polyvinyl chloride, polyamide, polyvinylidene chloride, ethylene/vinyl acetate, any of which may include additives and stabilisers adapting them to the purpose and the process such as anti-blocking and slip additives to militate against layers sticking together (especially with adhesive layers) on storage on roll, and to facilitate the tube sliding through the everted tube.
  • Any of the materials can be suitably cross-linked for hot or cold curing to set the material in its opened-out form once inside the pipe.
  • An adhesive layer may comprise a heat activated adhesive or resin suitable for bonding to the inside of metallic or polyethylene substrates together with a suitable catalyst.
  • Conductive and semiconductive polymer and even electronic devices can also be used as or inco ⁇ orated in the film material for various purposes for example for temperature control or flow or pressure measurement, dual containment, detection of substances flowing in the pipe and so forth.
  • FIG. 5 is an end view of a tube 12 having a single gusset 51 ;
  • Figure 6 is an end view of a tube 12 having two gussets 61
  • a simple ungussetted layflat tube has a width equal to ⁇ r, where r is the radius of the tube when blown out into circular form. The layflat tube is thus wider than the blown out tube (2r) and this can give rise to difficulties in passing the tube in its flat state through the already opened out tube during the eversion process, especially on long pipe runs with bends and angles.
  • Gusseting reduces the width ofthe layflat tube.
  • the tube shown in Figure 5 with a single gusset has a width of about 2r, while that shown in Figure 6 has a width of about 1.6r, the broken line circle in each Figure indicating the opened-out circumference.
  • Mains pipes with ferrules or branch connectionc can be lined by everting the film tube through the pipe and adhering it to the walls by the adhesive technique after which the branch or ferrule is reopened as by a probe or by air pressure to allow the next section to be lined.

Landscapes

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

Abstract

L'invention se rapporte à un procédé d'application d'un revêtement intérieur dans une conduite, selon lequel un matériau en forme de film tubulaire est fixé à une extrémité de la conduite et retourné sous la pression d'un fluide dans la conduite.
EP96925002A 1995-07-20 1996-07-19 Revetement interieur de conduites Withdrawn EP0861400A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9514883 1995-07-20
GBGB9514883.9A GB9514883D0 (en) 1995-07-20 1995-07-20 Lining pipes
PCT/GB1996/001735 WO1997004269A1 (fr) 1995-07-20 1996-07-19 Revetement interieur de conduites

Publications (1)

Publication Number Publication Date
EP0861400A1 true EP0861400A1 (fr) 1998-09-02

Family

ID=10777994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96925002A Withdrawn EP0861400A1 (fr) 1995-07-20 1996-07-19 Revetement interieur de conduites

Country Status (4)

Country Link
EP (1) EP0861400A1 (fr)
AU (1) AU6526196A (fr)
GB (1) GB9514883D0 (fr)
WO (1) WO1997004269A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1011105A3 (fr) * 1997-04-14 1999-04-06 Norditube Technologies Ab Dispositif de reversion.
AUPP065297A0 (en) * 1997-12-02 1998-01-08 Harrington, David Richard System for formed-in-situ localised repair of pipes and conduits
AU737147B2 (en) * 1997-12-02 2001-08-09 Sideliner Enterprises Pty Ltd System for the formed-in-situ localised repair of pipes and conduits
DE19852690A1 (de) * 1998-11-16 2000-05-18 Mueller Umwelttechnik Verfahren und Vorrichtung zum Sanieren eines im Erdreich verlegten Altrohrstranges
GB9908602D0 (en) 1999-04-15 1999-06-09 Northumbria Lyonnaise Technolo Rehabilitation of water supply pipes
NZ538556A (en) * 2002-09-02 2007-12-21 Shieldliner Ltd Method for high-frequency tuning an electrical device and a printed circuit board suitable therefor
US20120107048A1 (en) * 2009-06-28 2012-05-03 Kibutz Yotvata Irrigation conduit and system
EP2551109A1 (fr) 2011-07-25 2013-01-30 Basell Poliolefine Italia S.r.l. Construction de pipe-lines avec compositions de polyoléfine hétérophasique et résine thermodurcissable

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1002131A (en) * 1963-05-22 1965-08-25 Wolff & Company Kommanditgesel Improvements in or relating to apparatus for and method of turning inside out a flexible tube
JPS5524324B2 (fr) * 1975-01-11 1980-06-28
DE2952625A1 (de) * 1978-12-29 1980-07-17 Ashimori Ind Co Ltd Verfahren und vorrichtung zum auskleiden eines rohrs mit flexiblem, schlauchfoermigem material
FR2503622A1 (fr) * 1981-04-13 1982-10-15 Laurent Jacques Procede pour chemiser interieurement des canalisations et tube pour sa mise en oeuvre
JPH0641173B2 (ja) * 1986-10-16 1994-06-01 ハンス・ミユラ− 地中に敷設された導管を補修する方法
GB8718212D0 (en) * 1987-07-31 1987-09-09 Angus Fire Armour Ltd Lining tubular objects
NL9001540A (nl) * 1990-07-05 1992-02-03 Wavin Bv Werkwijze en inrichting voor het aanbrengen van een binnenbuis in een bestaande buisleiding, alsmede buisleiding met hierin aangebrachte binnenbuis uit verstrekte thermoplastische kunststof.
GB9312190D0 (en) * 1993-06-12 1993-07-28 Insituform Technologies Limite Improvements relating to the lining of pipelines and passage-ways

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9704269A1 *

Also Published As

Publication number Publication date
AU6526196A (en) 1997-02-18
WO1997004269A1 (fr) 1997-02-06
GB9514883D0 (en) 1995-09-20

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