CA2080046A1 - Device for temporarily obturating a pipeline carrying any fluid whatsoever - Google Patents
Device for temporarily obturating a pipeline carrying any fluid whatsoeverInfo
- Publication number
- CA2080046A1 CA2080046A1 CA002080046A CA2080046A CA2080046A1 CA 2080046 A1 CA2080046 A1 CA 2080046A1 CA 002080046 A CA002080046 A CA 002080046A CA 2080046 A CA2080046 A CA 2080046A CA 2080046 A1 CA2080046 A1 CA 2080046A1
- Authority
- CA
- Canada
- Prior art keywords
- pipeline
- bag
- brace
- fluid
- jack
- 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
- 239000012530 fluid Substances 0.000 title claims abstract description 20
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 abstract description 2
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/10—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with inflatable member
-
- 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
- F16L55/10—Means for stopping flow in pipes or hoses
- F16L55/12—Means for stopping flow in pipes or hoses by introducing into the pipe a member expandable in situ
- F16L55/124—Means for stopping flow in pipes or hoses by introducing into the pipe a member expandable in situ introduced radially into the pipe or hose
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for the temporary obturation of a pipeline carrying any fluid whatesoever, the device comprising an inflatable bag associated with a brace co-operating with the inner wall of the pipeline and pivotedly connected to a rod or a jack so that a bag may be inserted positively and in the correct direction into the pipeline and may after having been inflated be mechanically and positively retained in its position of obturation of the pipeline.
A device for the temporary obturation of a pipeline carrying any fluid whatesoever, the device comprising an inflatable bag associated with a brace co-operating with the inner wall of the pipeline and pivotedly connected to a rod or a jack so that a bag may be inserted positively and in the correct direction into the pipeline and may after having been inflated be mechanically and positively retained in its position of obturation of the pipeline.
Description
The present invention relates essentially to a device for temporarily obturating a pipeline conveying any fluid whatsoever such as gas for example.
There has already been proposed to temporarily obturate a duct onto which an operation should be conducted by means of an inflatable balloon or bladder.
More specifically after having carried out in the ground an escavation or digging allowing to disclose the pipeline, there will be fastened on this pipeline a system forming a lock which allows the drilling and then the insertion of the deflated bag into the pipeline so that after the inflation the bag could obturate the pipeline for the time necessary to perform the contemplated operation theron.
Heretofore the bag forming a pipeline obtuarator was inserted by hand into said pipeline with a view to be inflated afterwards in order to shut off or to obturate as completely as possible the inner passageway section thereof.
Now t,his way of proceeding in a craft-like manner exhibits a number of inconveniences. At first the insertion of the inflatable bag into the pipeline was difficult and dangerous in view of the pressure of the fluid within the pipeline from upstream to downstream.
Under the effect of the pressure the inflatable bag had of course the tendancy once inserted through the drilled hole to be driven downstream of the drilled hole thereby obviously incurring the risk of producing dangerous fluid leakages towards the outside through the drilled hole whereas the inflatable bag should be inserted into the pipeline towards the upstream side, i.e. upstream of the drilled hole in order after inflation and obturation to avoid any escape of the fluid outwards.
Moreover the insertion and then the withdrawal of the bladder or the balloon generally of great diameter required the presence of two persons which had to supply a rather substantial manual force.
The object of the present invention is therefore to cope in particular with the inconveniences referred to hereinabove by providing a temporary obturation device exhibiting a great reliability in connection with the insertion of the bag into the pipeline and with the safety in respect of the fluid-tightness achieved by the inflated bag and of the risk of fluid leakages outwards.
For that purpose the subject of the invention is a device for the temporary obturation of a buried pipeline carrying any fluid whatsoever such as gas and of the type comprising an inflatable bag capable of penetrating through a drilled hole into said pipeline so as to be capable after having been inflated of obturating the latter, characterized in that the said bag is associated with a brace co-operating with the inner wall of the pipeline in order that the bag may be inserted positively into this pipeline and may after having been inflated be mechanically retained in its position of obturation of said pipeline.
According to another characterizing feature of this device said brace is mounted in pivotedly connected reltionship on a rod or the like belonging for instance to a jack insertable through a bore hole provided in the ground above the pipeline.
It should further be specified here that according to another characterizing feature of the invention the pivotal connection between the brace and the rod is an articulation with a lamented motion amplitude allowing the orientation and the insertion of the brace-bag assembley into the pipeline along a priviledged direction.
The device according to this invention is further characterized in that the brace is formed of at least one arm or the like extending in sealing relationship through the bag at one end of which is pivotedly connected to said rod and the other end of which comprises a pad or the like capable of co-operating with the inner wall of the pipeline.
There is further provided in the device according to this invention a duct for feeding inflation fluid to the bag via the aforesaid articulation, which duct is made fast to the aforesaid rod and jack.
The invention will be better understood and further objects, characterizing features, details and advantages thereof will appear better in the explanatory description which follows an~ refers to the accompanying diagrammatic drawing given by way of non-limiting example only and in which the single figure shows an elevational view of a device according to the invention fitted with an inflatable bag shown in the position inserted into a pipeline.
Referring to the figure there is seen at 1 a pipeline carrying a fluid such as gas for instance in the direction shown by the arrow F, this duct being buried into the ground S.
If an operation is required to be performed on the pipeline, an excavation or bore hole as shown at 2 is provided in the ground S, which hole may possibly be propped by a casing, a cradle or the like 3.
The bore hole 2 having been carried out until the pipeline 1 has been disclosed or brought to light, there is then performed, also by means of a suitable tooling not shown, a drilling into the pipeline 1 as is seen at 4. It is through this drilled hole 4 and via the bore hole 2 that the device according to the invention which will be described in detail hereinafter will be inserted and allowed the temporary obturation of the pipeline 1 in order to be able to proceed with an operation on said pipeline.
As seen in the figure this device essentially comprises an inflatable bag 5 assuming the shape of a balloon or of a bladder from elastic material with which is associated a brace advantageously allowing as will be described hereinafter to positively insert the bag sack into the duct or pipeline 1 and allowing after having been inflated the mechanical and positive retaining of said bag in its position of obturation of the pipeline 1.
According to the examplary embodiment shown the bag 5 could consist of an outer envelope 5a made from fluid-tight elastic material and of an inner cover 5b made from a flexible and not very extensable porous material.
The rigid or semi-rigid brace 6 could be made from any suitable metallic or synthetic material and assume any shape whatesoever capable of being adequately integrated into the shape of the inflatable bag 5. According to the examplary embodiment shown the brace ~ consists of at least one arm 7 extending in sealing relationship through the inflatable bag 5, said arm having 1 and 7a pivotedly connected through the medium of an articulation 8 to a rod 9 associated with the piston 10 of a jack 11. The other end 7b of the arm(s) 7 comprises a pad-like element 12 capable of co-operating with the inner wall 1a of the pipeline 1.
The articulation between the brace ~ and the rod 9 will according to the invention be an unidirectional articulation with respect to the axis of the pipeline 1, i.e. an articulation with a lamented motion amplitude permitting the insertion of the brace 6 and of its associated bag 5 into the pipeline 1 in a priviledged direction towards the right or towards the left after having been passed through the drilled hole 4.
The articulation 8 may be provided with the assistance of any suitable means whatsoever not shown. It may for instance be an articulation assuming the shape of a hinge provided with a stop for example so that one of the elements of the hinge, namely the one made fast to the brace 6, may move with respect to the other one only through an angle lower than 1800 so that once the brace 6 bag-sack assembley has been inserted into the pipeline via the drilled hole 4, said assembley will make such an angle with respect to the axis of the pipeline 1 that at the bearing position of the pad 12 upon the inner wall 1a of said pipeline, said assembley will necessarily be oriented and guided therein towards the right or towards the left in accordance with the direction of flow of the fluid within the pipeline 1 as will be explained in detail later on.
At 13 has been shown on the figure a flexible duct for supplying inflating fluid to the bag-sack, said duct passing through the articultion ~ and being preferably made fast to the rod 9 and to the body of the jack 11 by any suitable means whatsoever. It should be pointed out that the body of the jack 11 may be rigidly fastened by any suitable means such as a flange 14 to the casing or cradle 3 itself inserted into the bore hole 2.
The body of the jack 11 would of course comprise as known per se a fluid inlet and outlet diagrammatically shown at 15 whereas the duct 13 may as also known per se be connected to a source of fluid adapted to inflate the bag 5.
Now for a better understanding the operation of the device which has just been described will be described briefly.
After having carried out the bore hole into the ground S
and after insertion of the casing 3 into this hole and the drilling at 4 of the pipeline 1 as previously explained the jack 11 will be fastened within said casing.
At this stage the piston 10 will be raised or moved upward within the body of the jack 11 so that the brace 6 bag-sack assembley will in a way be accommadated or housed within the body of the jack 11.
It should be pointed out here that at this stage the articulation 8 will have been suitably indexed according to the direction of flow of the fluid such as gas within the pipeline 1, it being understood that the inflatable bag 5 will have to be directed the upstream side of the pipeline, i.e. against the pressure of the fluid in the direction of the arrow F within this pipeline in order to avoid any leakage via the drilled hole 4.
Thus as seen on the figure when for example hydraulic fluid is injected into the body of the jack 11, the system consisting of the piston 10, the rod 9, the articulation ~, the brace 6 and the bag-sack would move out of the body of the jack and the articulation 8 will be induced in such a manner that the pad 12 will bear upon the wall 1a of the pipeline 1 towards the right of the axis of the jack 11 and of the rod 9. In other terms the brace 6 bag-sack assembley will be positively and necessarily oriented rightwards of figure 1 and inflation of the bag-sack via the duct 13, not only said bag will obturate the pipeline 1 but the brace 6 associated with the bag-sack will positively retain the bag in its obtuarating position to allow the desired operation to be carried out on the pipeline.
When the operation is completed it will suffice after deflation of the bag 5 to cause the piston 10 hence the brace 6 bag-sack assembley to rise or move upwards within the body of the jack 11 and then the drilled hole 4 will be stopped up by a suitable tooling and the bore hole 2 will then be filled in, it being understood that all these operating steps could be performed through the medium of a lock as known per se.
There has therefore been provided according to the invention a device for the temporary obturation of a pipeline which allows the positive insertion and in the correct direction of an inflatable bag into a pipeline and which also allows positive and mechanical retaining of the bag after inflation thereof in its position of obturation of said pipeline so that an operation on the latter may be carried with full safety.
The temporary obturation of a pipeline by means of this device could be performed on any building site in an urban or non-urban environment and on any kind of pipeline carrying a fluid under pressure, the security of the possibly remotely actuated and controlled obturating operations being quasi-totalled.
The invention is of course not at all limited to the embodiment described and illustrated which has been given by way of example only.
Thus the articulation with a lamented motion amplitude and/or indexed between the rod 9 and the brace 6 may be of any design whatsoever as well as a means other than a jack could be provided to insert the brace-inflatable bag assembley into the pipeline to be shut off.
The invention therefore comprises all the technical equivalents of the means described as well as their combinations if the latter are carried out according to its gist and within the scope of the appended claims.
There has already been proposed to temporarily obturate a duct onto which an operation should be conducted by means of an inflatable balloon or bladder.
More specifically after having carried out in the ground an escavation or digging allowing to disclose the pipeline, there will be fastened on this pipeline a system forming a lock which allows the drilling and then the insertion of the deflated bag into the pipeline so that after the inflation the bag could obturate the pipeline for the time necessary to perform the contemplated operation theron.
Heretofore the bag forming a pipeline obtuarator was inserted by hand into said pipeline with a view to be inflated afterwards in order to shut off or to obturate as completely as possible the inner passageway section thereof.
Now t,his way of proceeding in a craft-like manner exhibits a number of inconveniences. At first the insertion of the inflatable bag into the pipeline was difficult and dangerous in view of the pressure of the fluid within the pipeline from upstream to downstream.
Under the effect of the pressure the inflatable bag had of course the tendancy once inserted through the drilled hole to be driven downstream of the drilled hole thereby obviously incurring the risk of producing dangerous fluid leakages towards the outside through the drilled hole whereas the inflatable bag should be inserted into the pipeline towards the upstream side, i.e. upstream of the drilled hole in order after inflation and obturation to avoid any escape of the fluid outwards.
Moreover the insertion and then the withdrawal of the bladder or the balloon generally of great diameter required the presence of two persons which had to supply a rather substantial manual force.
The object of the present invention is therefore to cope in particular with the inconveniences referred to hereinabove by providing a temporary obturation device exhibiting a great reliability in connection with the insertion of the bag into the pipeline and with the safety in respect of the fluid-tightness achieved by the inflated bag and of the risk of fluid leakages outwards.
For that purpose the subject of the invention is a device for the temporary obturation of a buried pipeline carrying any fluid whatsoever such as gas and of the type comprising an inflatable bag capable of penetrating through a drilled hole into said pipeline so as to be capable after having been inflated of obturating the latter, characterized in that the said bag is associated with a brace co-operating with the inner wall of the pipeline in order that the bag may be inserted positively into this pipeline and may after having been inflated be mechanically retained in its position of obturation of said pipeline.
According to another characterizing feature of this device said brace is mounted in pivotedly connected reltionship on a rod or the like belonging for instance to a jack insertable through a bore hole provided in the ground above the pipeline.
It should further be specified here that according to another characterizing feature of the invention the pivotal connection between the brace and the rod is an articulation with a lamented motion amplitude allowing the orientation and the insertion of the brace-bag assembley into the pipeline along a priviledged direction.
The device according to this invention is further characterized in that the brace is formed of at least one arm or the like extending in sealing relationship through the bag at one end of which is pivotedly connected to said rod and the other end of which comprises a pad or the like capable of co-operating with the inner wall of the pipeline.
There is further provided in the device according to this invention a duct for feeding inflation fluid to the bag via the aforesaid articulation, which duct is made fast to the aforesaid rod and jack.
The invention will be better understood and further objects, characterizing features, details and advantages thereof will appear better in the explanatory description which follows an~ refers to the accompanying diagrammatic drawing given by way of non-limiting example only and in which the single figure shows an elevational view of a device according to the invention fitted with an inflatable bag shown in the position inserted into a pipeline.
Referring to the figure there is seen at 1 a pipeline carrying a fluid such as gas for instance in the direction shown by the arrow F, this duct being buried into the ground S.
If an operation is required to be performed on the pipeline, an excavation or bore hole as shown at 2 is provided in the ground S, which hole may possibly be propped by a casing, a cradle or the like 3.
The bore hole 2 having been carried out until the pipeline 1 has been disclosed or brought to light, there is then performed, also by means of a suitable tooling not shown, a drilling into the pipeline 1 as is seen at 4. It is through this drilled hole 4 and via the bore hole 2 that the device according to the invention which will be described in detail hereinafter will be inserted and allowed the temporary obturation of the pipeline 1 in order to be able to proceed with an operation on said pipeline.
As seen in the figure this device essentially comprises an inflatable bag 5 assuming the shape of a balloon or of a bladder from elastic material with which is associated a brace advantageously allowing as will be described hereinafter to positively insert the bag sack into the duct or pipeline 1 and allowing after having been inflated the mechanical and positive retaining of said bag in its position of obturation of the pipeline 1.
According to the examplary embodiment shown the bag 5 could consist of an outer envelope 5a made from fluid-tight elastic material and of an inner cover 5b made from a flexible and not very extensable porous material.
The rigid or semi-rigid brace 6 could be made from any suitable metallic or synthetic material and assume any shape whatesoever capable of being adequately integrated into the shape of the inflatable bag 5. According to the examplary embodiment shown the brace ~ consists of at least one arm 7 extending in sealing relationship through the inflatable bag 5, said arm having 1 and 7a pivotedly connected through the medium of an articulation 8 to a rod 9 associated with the piston 10 of a jack 11. The other end 7b of the arm(s) 7 comprises a pad-like element 12 capable of co-operating with the inner wall 1a of the pipeline 1.
The articulation between the brace ~ and the rod 9 will according to the invention be an unidirectional articulation with respect to the axis of the pipeline 1, i.e. an articulation with a lamented motion amplitude permitting the insertion of the brace 6 and of its associated bag 5 into the pipeline 1 in a priviledged direction towards the right or towards the left after having been passed through the drilled hole 4.
The articulation 8 may be provided with the assistance of any suitable means whatsoever not shown. It may for instance be an articulation assuming the shape of a hinge provided with a stop for example so that one of the elements of the hinge, namely the one made fast to the brace 6, may move with respect to the other one only through an angle lower than 1800 so that once the brace 6 bag-sack assembley has been inserted into the pipeline via the drilled hole 4, said assembley will make such an angle with respect to the axis of the pipeline 1 that at the bearing position of the pad 12 upon the inner wall 1a of said pipeline, said assembley will necessarily be oriented and guided therein towards the right or towards the left in accordance with the direction of flow of the fluid within the pipeline 1 as will be explained in detail later on.
At 13 has been shown on the figure a flexible duct for supplying inflating fluid to the bag-sack, said duct passing through the articultion ~ and being preferably made fast to the rod 9 and to the body of the jack 11 by any suitable means whatsoever. It should be pointed out that the body of the jack 11 may be rigidly fastened by any suitable means such as a flange 14 to the casing or cradle 3 itself inserted into the bore hole 2.
The body of the jack 11 would of course comprise as known per se a fluid inlet and outlet diagrammatically shown at 15 whereas the duct 13 may as also known per se be connected to a source of fluid adapted to inflate the bag 5.
Now for a better understanding the operation of the device which has just been described will be described briefly.
After having carried out the bore hole into the ground S
and after insertion of the casing 3 into this hole and the drilling at 4 of the pipeline 1 as previously explained the jack 11 will be fastened within said casing.
At this stage the piston 10 will be raised or moved upward within the body of the jack 11 so that the brace 6 bag-sack assembley will in a way be accommadated or housed within the body of the jack 11.
It should be pointed out here that at this stage the articulation 8 will have been suitably indexed according to the direction of flow of the fluid such as gas within the pipeline 1, it being understood that the inflatable bag 5 will have to be directed the upstream side of the pipeline, i.e. against the pressure of the fluid in the direction of the arrow F within this pipeline in order to avoid any leakage via the drilled hole 4.
Thus as seen on the figure when for example hydraulic fluid is injected into the body of the jack 11, the system consisting of the piston 10, the rod 9, the articulation ~, the brace 6 and the bag-sack would move out of the body of the jack and the articulation 8 will be induced in such a manner that the pad 12 will bear upon the wall 1a of the pipeline 1 towards the right of the axis of the jack 11 and of the rod 9. In other terms the brace 6 bag-sack assembley will be positively and necessarily oriented rightwards of figure 1 and inflation of the bag-sack via the duct 13, not only said bag will obturate the pipeline 1 but the brace 6 associated with the bag-sack will positively retain the bag in its obtuarating position to allow the desired operation to be carried out on the pipeline.
When the operation is completed it will suffice after deflation of the bag 5 to cause the piston 10 hence the brace 6 bag-sack assembley to rise or move upwards within the body of the jack 11 and then the drilled hole 4 will be stopped up by a suitable tooling and the bore hole 2 will then be filled in, it being understood that all these operating steps could be performed through the medium of a lock as known per se.
There has therefore been provided according to the invention a device for the temporary obturation of a pipeline which allows the positive insertion and in the correct direction of an inflatable bag into a pipeline and which also allows positive and mechanical retaining of the bag after inflation thereof in its position of obturation of said pipeline so that an operation on the latter may be carried with full safety.
The temporary obturation of a pipeline by means of this device could be performed on any building site in an urban or non-urban environment and on any kind of pipeline carrying a fluid under pressure, the security of the possibly remotely actuated and controlled obturating operations being quasi-totalled.
The invention is of course not at all limited to the embodiment described and illustrated which has been given by way of example only.
Thus the articulation with a lamented motion amplitude and/or indexed between the rod 9 and the brace 6 may be of any design whatsoever as well as a means other than a jack could be provided to insert the brace-inflatable bag assembley into the pipeline to be shut off.
The invention therefore comprises all the technical equivalents of the means described as well as their combinations if the latter are carried out according to its gist and within the scope of the appended claims.
Claims (3)
1. A device for the temporary obturation of a buried pipeline carrying any fluid whatsoever such as gas and of the type comprising an inflatable bag capable of penetrating through a drilled hole into the pipeline and with which is associated a brace, wherein the improvement consists in that said brace is pivotedly connected to a rod belonging to a jack insertable through a bore hole provided in the ground above the pipeline and in that the pivotal connection between the brace and the rod is an articulation with a lamented motion amplitude allowing the orientation and insertion of the brace-bag assembly into the pipeline in a privileged direction.
2. A device according to claim 1, wherein said brace comprises at least one arm extending in fluid-tight relationship through the bag at one end of which is pivotedly connected to said rod whereas its other end comprises a pad adapted to co-operate with the inner wall of the pipeline.
3. A device according to claim 1 or 2, further comprising a duct for feeding and inflation fluid to the bag via said articulation, which duct is made fast to said and jack.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9112444A FR2682451B1 (en) | 1991-10-09 | 1991-10-09 | PROVISIONAL SHUTTERING DEVICE OF A PIPELINE CONVEYING ANY FLUID. |
| FR9112444 | 1991-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2080046A1 true CA2080046A1 (en) | 1993-04-10 |
Family
ID=9417753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002080046A Abandoned CA2080046A1 (en) | 1991-10-09 | 1992-10-07 | Device for temporarily obturating a pipeline carrying any fluid whatsoever |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0537077A1 (en) |
| JP (1) | JPH07190282A (en) |
| CA (1) | CA2080046A1 (en) |
| FR (1) | FR2682451B1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3596084B2 (en) * | 1995-04-26 | 2004-12-02 | ソニー株式会社 | Electroluminescent device |
| AUPQ625100A0 (en) * | 2000-03-14 | 2000-04-06 | Yarra Valley Water Ltd | Improved water main isolating device |
| FR2860569B1 (en) * | 2003-10-07 | 2007-04-27 | Christian Leviel | SHUTTER EQUIPMENT COMPRISING A FLEXIBLE STRUCTURE AND A TRACTION DEVICE FOR REPLACING |
| JP6501605B2 (en) * | 2015-05-18 | 2019-04-17 | 三菱重工業株式会社 | Water stop unit and water stop method |
| ES1189608Y (en) * | 2017-07-27 | 2017-10-27 | Casanovas Arturo Parellada | Water and solids device in pipes |
| JP7297259B2 (en) * | 2020-02-18 | 2023-06-26 | 株式会社トッププランニングJapan | Reinforcement unit for hollow pillar and method for reinforcing hollow pillar |
| CN114251537A (en) * | 2021-12-28 | 2022-03-29 | 中冶天工集团有限公司 | Municipal pipe network plugging device and using method |
| CN114877156B (en) * | 2022-04-30 | 2024-12-20 | 南京宁淳经济发展有限公司 | Municipal pipelines with blocking airbags based on municipal control |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR368082A (en) * | 1906-03-21 | 1906-11-16 | Albert Pape | Obturator for gas pipes |
| FR683782A (en) * | 1928-11-15 | 1930-06-17 | Improved shut-off device for gas pipes | |
| US1889621A (en) * | 1930-11-13 | 1932-11-29 | George S Ankarlo | Gas main stopper |
| US4291727A (en) * | 1979-02-28 | 1981-09-29 | Institute Of Gas Technology | Pipeline flow restrictor and process |
-
1991
- 1991-10-09 FR FR9112444A patent/FR2682451B1/en not_active Expired - Fee Related
-
1992
- 1992-10-07 CA CA002080046A patent/CA2080046A1/en not_active Abandoned
- 1992-10-08 EP EP92402756A patent/EP0537077A1/en not_active Withdrawn
- 1992-10-09 JP JP4271764A patent/JPH07190282A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0537077A1 (en) | 1993-04-14 |
| FR2682451B1 (en) | 1994-12-09 |
| JPH07190282A (en) | 1995-07-28 |
| FR2682451A1 (en) | 1993-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19960407 |