WO1983002144A1 - Sealing joints in pipes large enough in diameter for entry of personnel - Google Patents
Sealing joints in pipes large enough in diameter for entry of personnel Download PDFInfo
- Publication number
- WO1983002144A1 WO1983002144A1 PCT/GB1982/000343 GB8200343W WO8302144A1 WO 1983002144 A1 WO1983002144 A1 WO 1983002144A1 GB 8200343 W GB8200343 W GB 8200343W WO 8302144 A1 WO8302144 A1 WO 8302144A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mould
- joint
- channel
- sealant resin
- diameter
- Prior art date
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
- F16L55/18—Appliances for use in repairing pipes
-
- 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
- F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe
- F16L55/16455—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe a part of the tool defining, together with the inner wall of the pipe, an enclosed space into which sealing material is injected
Definitions
- This invention relates to a method of sealing in pipes large enough in diameter for entry of personnel, for example gas-main pipes.
- An objection of the invention is to provide a method of sealing for example, large diameter gas-main pipe joints which reduces the amount of excavation necessary and thereby reduces the inconvenience to the public and traffic by making it unnecessary to excavate at each joint.
- a method of sealing joints in pipes large enough in diameter for entry of personnel comprising the steps of providing an annular mould comprising edge portions and an intermediate portion having therein a shallow channel, extending longitudinally along one side, the mould being thick enough to prevent appreciable distension of the intermediate portion by injected sealant resin, applying the mould to the inner surfaces of the pipe ends on each side of the joint with the channel facing outwards and covering the joint, clamping the edge portions of the mould to the respective pipe ends by expanding bands applied internally of the fitted mould, injecting under pressure ' a sealant resin into the channel so as to fill the channel and any spaces in the joint, allowing the injected sealant resin to cure, and finally removing the bands and the. mould.
- a release agent is applied to the surface of the channel.
- the sealant becomes cured in the cross-sectional shape of a letter T, the arms of the T being the portion which filled the channel in the mould and the leg of the T being the portion which filled any spaces in the joint and extending radially outwards.
- This cross-sectional shape has the advantage that the gas pressure in the pipe aids in maintaining the sealing of the joint in use.
- Fig, 1 is a cross-section of a pipe at a joint showing how the sealant resin is applied
- Fig. 2 is a section to an enlarged scale on line A-A in Fig. 1;
- Fig. 3 shows, to the same scale as Fig. 2, a detail of the mould viewed in the direction of arrow B in Fig, 1, 'and
- Fig. 4 to 7 are also to the same scale as Figs. 2
- OMPI and 3 show. respectively a plan view of an expansion buckle of a clamping band, a side view of the buckle, a slotted lug fonning part of the buckle, and a section through the clamping band at the same location as Fig. 3.
- a neoprene mould 1 is provided in the form of a strip.
- the ends of the strip are shown in Fig. 3 with interengaging formations 2 and in Figs.
- each band 4 is provided for use with the mould 1 . Details of the ends of each band 4 are shown in Figs. 4,5 and 6. Near one end of each band 4 an outstanding lug 5 is welded and apertured to receive a screw 6 which is threaded into a nut 7 welded to the lug 5. At the other end of each band 4 there are welded two out ⁇ standing lugs 8 provided with slots 9 for slidably receiving the end portion of the band beyond, the lug 5. Intermediate the ends of each band 4 there is welded an overlying lug 10 extending beyond one edge of the band.
- a release agent is applied. o the channel
- the mould 1 is applied in the form of an annulus to the inner surfaces of the pipe ends 11 and 12 • (see Fig. 2) on each side of the joint so that the channel faces outwards and covers the joint.
- the ends of the mould are at the bottom.of the pipe.
- the two bands 4 are then applied to the • respective edge portions of the mould 1 as shown in Fig. 2 and expanded by means of the screws 6 so as to clamp the edge portions of the mould 1 to the inner surfaces of the respective pipe ends 11 and 12.
- the buckles are shown at the left hand side whereas the lugs 10 are at the bottom at the location of the ends of the mould 1.
- a steel plate 13 is retained between the bands 4 by the lugs 10 and a rubber gasket 14 is retained between the plate 13 and the ends of the mould 1.
- a sealant resin 15 is injected under pressure, via a valve 16 " through the mould 1 into the channel 3 so as to fill the channel 3 and any spaces in the joint.
- An air release means 17 is provided at the top of Fig.
- the operator can then move along inside the pipe to the next joint without the need for excavation at that joint. It is envisaged that excavation using the above method could be as far apart as 300 to 400 yards.
- the mould 1 being in the form of a strip having ends, it can be made in the form of an annulus of a diameter substantially equal to the internal diameter of the pipe.
- the mould 1 is thin enough for its flexibility to facilitate its application to the inner surface of the pipe ends 11 and 12 but thick enough to prevent appreciable distension by the injected sealant resin of the intermediate portion between the bands 4.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Joints With Sleeves (AREA)
Abstract
In a method of sealing gas-main pipe joints an annular mould (1) is applied to the inner surfaces of pipe ends (11 and 12) on each side of the joint and covering the joint. The edges of the mould are clamped to the respective pipe ends by expanding bands (4) applied internally of the fitted mould and a sealant resin is injected between the mould and the inner surfaces of the pipe ends and into any spaces in the joint. The injected sealant resin is allowed to cure and the bands and the mould are removed.
Description
"Sealing Joints.- in- Pipes large- enough in diameter for * entry of personnel" •- .• •-. - ■ -.• • ■ • ■-. •
DESCRIPTION
This invention relates to a method of sealing in pipes large enough in diameter for entry of personnel, for example gas-main pipes.
When natural gas began to be used instead of town gas it wwas found that the extra dryness and higher pressures of natural gas caused the sisal, which acted as a seal at gas-main pipe joints to deteriorate more rapidly than was the case with town gas. Many sealing methods were proposed and were reasonably successful but with the large diameter mains it was found necessary - to excavate at each joint in order to seal the joint externally. One method of external sealing that was proposed involved the external application of a steel or canvas muff about the joint and to apply a sealant resin known under the trade name "Encapress" between the muff and the joint. It has also been proposed to seal internally using a rigid assembly of segmental parts which are expanded sealingly to engage the inside of the pipe and again to apply the sealant resin. This assembly remains in the pipe and is costly.
An objection of the invention is to provide a method of sealing for example, large diameter gas-main pipe joints which reduces the amount of excavation necessary and thereby reduces the inconvenience to the public and traffic by making it unnecessary to excavate at each joint. According to the invention there is provided a method of sealing joints in pipes large enough in diameter for entry of personnel, comprising the steps of providing an annular mould comprising edge portions and an intermediate portion having therein a shallow
channel, extending longitudinally along one side, the mould being thick enough to prevent appreciable distension of the intermediate portion by injected sealant resin, applying the mould to the inner surfaces of the pipe ends on each side of the joint with the channel facing outwards and covering the joint, clamping the edge portions of the mould to the respective pipe ends by expanding bands applied internally of the fitted mould, injecting under pressure' a sealant resin into the channel so as to fill the channel and any spaces in the joint, allowing the injected sealant resin to cure, and finally removing the bands and the. mould.
Preferably, a release agent, is applied to the surface of the channel.
The sealant becomes cured in the cross-sectional shape of a letter T, the arms of the T being the portion which filled the channel in the mould and the leg of the T being the portion which filled any spaces in the joint and extending radially outwards. This cross-sectional shape has the advantage that the gas pressure in the pipe aids in maintaining the sealing of the joint in use.
An embodiment of the invention will now be described by way of example, with, reference to the accompanying drawings, in which:-
Fig, 1 is a cross-section of a pipe at a joint showing how the sealant resin is applied;
Fig. 2 is a section to an enlarged scale on line A-A in Fig. 1;
Fig. 3 shows, to the same scale as Fig. 2, a detail of the mould viewed in the direction of arrow B in Fig, 1, 'and
Fig. 4 to 7 are also to the same scale as Figs. 2
OMPI
and 3 and show. respectively a plan view of an expansion buckle of a clamping band, a side view of the buckle, a slotted lug fonning part of the buckle, and a section through the clamping band at the same location as Fig. 3.
In the drawings, a neoprene mould 1 is provided in the form of a strip. The ends of the strip are shown in Fig. 3 with interengaging formations 2 and in Figs.
2 and 7 with a shallow channel 3 extending longitud- inally along one side. Provided for use with the mould 1 are two bands 4 of mild steel. Details of the ends of each band 4 are shown in Figs. 4,5 and 6. Near one end of each band 4 an outstanding lug 5 is welded and apertured to receive a screw 6 which is threaded into a nut 7 welded to the lug 5. At the other end of each band 4 there are welded two out¬ standing lugs 8 provided with slots 9 for slidably receiving the end portion of the band beyond, the lug 5. Intermediate the ends of each band 4 there is welded an overlying lug 10 extending beyond one edge of the band.
In use, a release agent is applied. o the channel
3 and the mould 1 is applied in the form of an annulus to the inner surfaces of the pipe ends 11 and 12 • (see Fig. 2) on each side of the joint so that the channel faces outwards and covers the joint. In Fig„ 1 the ends of the mould are at the bottom.of the pipe. The two bands 4 are then applied to the • respective edge portions of the mould 1 as shown in Fig. 2 and expanded by means of the screws 6 so as to clamp the edge portions of the mould 1 to the inner surfaces of the respective pipe ends 11 and 12. As shown in Fig. 1, the buckles are shown at the left hand side whereas the lugs 10 are at the bottom at the location of the ends of the mould 1. At this location a steel plate 13 is retained between the
bands 4 by the lugs 10 and a rubber gasket 14 is retained between the plate 13 and the ends of the mould 1.
A sealant resin 15 is injected under pressure, via a valve 16" through the mould 1 into the channel 3 so as to fill the channel 3 and any spaces in the joint.
An air release means 17 is provided at the top of Fig.
1, i.e. substantially diametrically opposite the valve
16 f so that when the resin begins to emerge from the means 17 the operator knows that the resin has filled all the available spaces. The injected sealant resin is allowed to cure and finally the mould 1 and bands 4 are removed leaving a reliable seal.
The operator can then move along inside the pipe to the next joint without the need for excavation at that joint. It is envisaged that excavation using the above method could be as far apart as 300 to 400 yards. Instead of the mould 1 being in the form of a strip having ends, it can be made in the form of an annulus of a diameter substantially equal to the internal diameter of the pipe.
The mould 1 is thin enough for its flexibility to facilitate its application to the inner surface of the pipe ends 11 and 12 but thick enough to prevent appreciable distension by the injected sealant resin of the intermediate portion between the bands 4.
*ξ\_ ?.t
OMP
Claims
1. A method of sealing joints in pipes large enough in diameter for entry of personnel, comprising the steps of providing an annular mould comprising edge portions and an intermediate portion having therein a shallow- channel extending longitudinally along one side, the mould being thick enough to prevent appreciable distension of the intermediate portion by injected sealant resin, applying the mould to the inner surface of the pipe- ends on each side of the joint with the channel facing outwards and covering the joint, clamping the edge portions of the mould to the respective pipe ends by expanding bands applied internally of the fitted' mould, injecting under pressure a sealant resin into the channel so as to fill the channel and any spaces in the joint, allowing the injected sealant resin to cure, and finally removing the bands and the mould.
2. A method according to claim 1, wherein a release agent is applied to the surface of the channel.
3. A method according to claim 1 or 2 , wherein the mould is provided in the form of a strip the ends of which have interengageable formations.
4. A method according to claim 1 or 2 , wherein the mould is provided in the form of an annulus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU11040/83A AU1104083A (en) | 1981-12-08 | 1982-12-06 | Sealing joints in pipes large enough in diameter for entry ofpersonnel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8136998811208 | 1981-12-08 | ||
GB8136998 | 1981-12-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1983002144A1 true WO1983002144A1 (en) | 1983-06-23 |
Family
ID=10526452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1982/000343 WO1983002144A1 (en) | 1981-12-08 | 1982-12-06 | Sealing joints in pipes large enough in diameter for entry of personnel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0099898A1 (en) |
ES (1) | ES8400926A1 (en) |
IT (1) | IT1153373B (en) |
WO (1) | WO1983002144A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2267545A (en) * | 1992-06-04 | 1993-12-08 | Alh Syst Ltd | Sealing of pipe joints |
US7143481B2 (en) * | 2004-01-15 | 2006-12-05 | Miki Manufacturing Co., Ltd. | Fixing ring for flexible pipe to manhole joint |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3267967A (en) * | 1963-02-18 | 1966-08-23 | Midland Nat Bank | Pipe repair tool |
US3951173A (en) * | 1974-11-08 | 1976-04-20 | Cherne Industrial, Inc. | Method and apparatus for sealing large diameter pipes |
US3960395A (en) * | 1974-06-17 | 1976-06-01 | Amerace Corporation | Expansion clamp |
US4067349A (en) * | 1976-11-15 | 1978-01-10 | Halliburton Company | Packer for testing and grouting conduits |
-
1982
- 1982-12-06 EP EP83900198A patent/EP0099898A1/en active Pending
- 1982-12-06 WO PCT/GB1982/000343 patent/WO1983002144A1/en not_active Application Discontinuation
- 1982-12-06 IT IT24628/82A patent/IT1153373B/en active
- 1982-12-07 ES ES518015A patent/ES8400926A1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3267967A (en) * | 1963-02-18 | 1966-08-23 | Midland Nat Bank | Pipe repair tool |
US3960395A (en) * | 1974-06-17 | 1976-06-01 | Amerace Corporation | Expansion clamp |
US3951173A (en) * | 1974-11-08 | 1976-04-20 | Cherne Industrial, Inc. | Method and apparatus for sealing large diameter pipes |
US4067349A (en) * | 1976-11-15 | 1978-01-10 | Halliburton Company | Packer for testing and grouting conduits |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2267545A (en) * | 1992-06-04 | 1993-12-08 | Alh Syst Ltd | Sealing of pipe joints |
US7143481B2 (en) * | 2004-01-15 | 2006-12-05 | Miki Manufacturing Co., Ltd. | Fixing ring for flexible pipe to manhole joint |
Also Published As
Publication number | Publication date |
---|---|
ES518015A0 (en) | 1983-11-16 |
EP0099898A1 (en) | 1984-02-08 |
IT8224628A0 (en) | 1982-12-06 |
IT1153373B (en) | 1987-01-14 |
IT8224628A1 (en) | 1984-06-06 |
ES8400926A1 (en) | 1983-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0071217B1 (en) | Method for restoring an underwater piling and an underwater jacket used therewith | |
US4752511A (en) | Method and apparatus for sealing the space between pipes and linings therefor | |
HK1096450A1 (en) | Device and method for repairing pipe using hydrophilic seals | |
US6138718A (en) | Apparatus and method for repairing pressure pipes | |
IE62593B1 (en) | Secondary containment system and method | |
HK1003143A1 (en) | Method and apparatus for repairing conduits | |
JPH02210122A (en) | Sealer of pipe and manhole and its method | |
US3439945A (en) | Pipe joint seal and method | |
GB2109496A (en) | Pipe compression seal | |
US4564201A (en) | Method and apparatus for sealing a discontinuity in a tubular assembly | |
WO1983002144A1 (en) | Sealing joints in pipes large enough in diameter for entry of personnel | |
EP0217189B1 (en) | lining and method of a lining pipe | |
US5549334A (en) | Retaining band assembly for internal pipe seals | |
US5327924A (en) | Abandonment of a branch main | |
GB2112097A (en) | Sealing joints in pipes | |
GB2075086A (en) | Duct linings | |
ES478074A1 (en) | Clamping and sealing device for jointing two interfitting pipe portions | |
FI81186B (en) | TAETNING. | |
US20210108754A1 (en) | Tapping Saddle Assembly and Method for Establishing, Repairing, or Sealing Off a Connection Between Two Pipes | |
GB2344147A (en) | Encasing tubular component | |
GB2365094A (en) | Device for sealing a leak in a plastic pipe | |
JP3003786U (en) | Internal water stop band | |
JPH0754278Y2 (en) | Packing material | |
CN219568930U (en) | Anti-leakage structure at top of dewatering well | |
RU2789170C2 (en) | Gasket for sealing the pipeline junction |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Designated state(s): AU DK JP NO |
|
AL | Designated countries for regional patents |
Designated state(s): BE DE FR NL SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1983900198 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1983900198 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1983900198 Country of ref document: EP |