KR20160040992A - the improved pipe line repairing structure and the construction method thereof - Google Patents

the improved pipe line repairing structure and the construction method thereof Download PDF

Info

Publication number
KR20160040992A
KR20160040992A KR1020150112551A KR20150112551A KR20160040992A KR 20160040992 A KR20160040992 A KR 20160040992A KR 1020150112551 A KR1020150112551 A KR 1020150112551A KR 20150112551 A KR20150112551 A KR 20150112551A KR 20160040992 A KR20160040992 A KR 20160040992A
Authority
KR
South Korea
Prior art keywords
liner
expansion
anchor
contraction
sealing member
Prior art date
Application number
KR1020150112551A
Other languages
Korean (ko)
Other versions
KR101618686B1 (en
Inventor
김새미
Original Assignee
유라이닝(주)
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 유라이닝(주) filed Critical 유라이닝(주)
Publication of KR20160040992A publication Critical patent/KR20160040992A/en
Application granted granted Critical
Publication of KR101618686B1 publication Critical patent/KR101618686B1/en

Links

Images

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/26—Lining or sheathing of internal surfaces
    • B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
    • 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
    • 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

Abstract

An objective of the present invention is to repair a decrepit or damaged underground pipe line (10). The present invention provides an improved pipe line repair structure and an installation method thereof. The improved pipe line repair structure comprises: a liner (100) inserted into the pipe line (10) to position both ends thereof on both ends of the pipe line (10); and a flexible sealing material (200) installed between an outer circumferential surface of both ends of the liner (100) and an inner circumferential surface of both ends of the pipe line (10). When the flexible sealing material (200) is wound on the liner (100) folded in a U-shape, and then the liner (100) is extended using a steam injector (not shown) to tightly press the outer circumferential surface of the liner (100) on the inner circumferential surface of the pipe line (10), a gap between the outer circumferential surface of both ends of the liner (100) and the inner circumferential surface of both ends of the pipe line (10) is sealed while maintaining watertightness in the gap.

Description

[0001] The present invention relates to an improved pipeline repair structure and a construction method thereof,

The present invention relates to an improved pipeline repair structure and a method of constructing the pipeline repair structure, which can omit the step of heating and forming the end of the liner to match the end of the liner with the flange surface, unlike the existing pipeline maintenance method.

The following figure is a conceptual diagram of Korean Patent No. 10-0825025 ('Method for forming a flange of a PE lining connection flange for unreinforced rehabilitation of an old water pipe and its device', Apr. 24, 2008) as a prior art.

Figure pat00001

The above-mentioned conventional patent is briefly described. After the polyethylene liner is protruded from the existing pipe, the heated molding machine is heated and pressed on the liner so that the protruded liner is spread out in a fan shape outward with the flange installed on the cut portion of the existing pipe. And the bolts are screwed into the holes of the bolts.

The problems of the above conventional patent are as follows.

○ The risk of using a heat molding machine

The heat molding machine is composed of steel, which is heated to 80 ~ 100 degrees, so that the polyethylene liner is softened and stretched out so it is very heavy and hot. - Very careful handling is required and there is a high risk of safety hazards for workers.

Especially, when repairing a large pipe over 1,000mm, the size of the molding machine is very large, which is about 1,500mm in diameter, heavy, and it has a very high workability and high risk of safety accident.

○ Difficulty of molding time and molding.

It is necessary to heat and press the polyethylene liner so that it spreads slowly, and the liner that is to be stretched should not be curled but flattened toward the flange. It is necessary to work with the clamp, ), And in the case of large pipes, it takes more than 6 hours.

○ Shape transformation

The polyethylene liner has a property to remember its shape and return to its original shape. Therefore, the fan-shaped liner, which is artificially heated and pressurized toward the flange and spreads outward, is contracted inward by a force to return to the original state. As the liner fixed between the two flanges shrinks, a gap is created between the flange and the liner, and the constant flowing through the pressure leaks into the gap.

Figure pat00002

As another conventional technique, for example, Korean Patent Registration No. 10-1342527 (" Pipe connection plug and connection device, pipe repair method using the pipe connection method ", December 17, 2013) can be cited as an example.

The above conventional patent is briefly described as a technique for repairing a pipeline by cutting a polyethylene liner in the same manner as an existing water pipe and thermally fusing a finish material formed of polyethylene having a T shape to a liner.

The problems of the above conventional patent are as follows.

○ Since the finishing material is connected to the liner by heat fusion, it is necessary to prepare and prepare for the work such as electric power source for heat generation, welding equipment, and 'T' shaped finish material.

○ Because it is a heat welding system, it is a heat radiator with high heat of 140 degrees. It is a method of connecting the melted part with the finishing material made of polyethylene and the liner. Therefore, there is a risk of safety accidents due to the use of a heat generator with a high heat of 140 degrees. In particular, when repairing large pipes over 1,000mm, the workability is poor.

[Patent Document 1] Korean Patent No. 10-0825025 'Method of forming a flange of a PE lining connection flange portion for a non-excavated regeneration of an old water pipe' and its apparatus', Apr. 24, 2008 [Patent Document 2] Korean Patent No. 10-1342527 'Pipe connecting device and pipe connecting device, pipe repair method using the same', December 17, 2013

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art. The purpose is as follows.

First, it is intended to provide an improved pipeline repair structure and its construction method that can eliminate unnecessary processes such as heat molding of a liner end and can easily construct even a less skilled worker with a predetermined quality.

Second, it is intended to provide an improved pipeline maintenance structure and a construction method thereof, in which the sealing material seals between the liner and the pipeline and there is no risk of flaws.

According to an aspect of the present invention, there is provided an apparatus for repairing an old or damaged channel,

A liner (100) inserted into the pipeline (10) and having both ends at both ends of the pipeline (10); And

And an elastic sealing member 200 installed between the outer peripheral surfaces of both ends of the liner 100 and the inner peripheral surfaces of both ends of the pipeline 10,

The elastic sealing member 200 is wound on the liner 100 in a folded U shape and then extends the liner 100 to a steam injector so that the outer circumferential surface of the liner 100 passes through the pipe 10 And the inner surface of both ends of the channel 10 and the inner peripheral surfaces of both ends of the channel 10 are sealed while maintaining the water tightness when the liner 100 is in close contact with the inner circumferential surface of the channel 10. [

According to the present invention, the following effects are expected.

First, it provides an improved pipeline repair structure and a construction method thereof that can eliminate unnecessary processes such as heat molding of a liner end and can easily install even an unskilled worker with a predetermined quality.

Second, it provides an improved pipeline repair structure and its construction method without the risk of sealing the sealing material between the liner and the pipeline.

Fig. 1 shows an improved pipeline repair structure of the present invention.
Fig. 2 shows another embodiment of the improved pipeline repair structure of the present invention.
3 shows another embodiment of the improved pipeline repair structure of the present invention.
Figs. 4 and 5 show the construction method of the improved pipeline repair structure of the present invention in order.
Fig. 6 is an enlarged view of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1. Improved pipe repair structure

Fig. 1 shows an improved pipeline repair structure of the present invention.

The improved pipeline repair structure of the present invention is for repairing an old or damaged pipeline 10,

A liner (100) inserted into the pipeline (10) and having both ends at both ends of the pipeline (10); And an elastic sealing member 200 installed between the outer circumferential surfaces of both ends of the liner 100 and the inner circumferential surfaces of both ends of the conduit 10,

The elastic sealing member 200 is wound on the liner 100 in a folded U shape and then extends the liner 100 to a steam injector so that the outer circumferential surface of the liner 100 passes through the pipe 10 The outer surface of both ends of the liner 100 and the inner circumferential surfaces of both ends of the channel 10 are sealed while maintaining watertightness.

The elastic sealing member 200 is preferably installed between the outer circumferential surfaces of both ends of the liner 100 and the inner circumferential surfaces of both ends of the conduit 10 as described above. And may be provided between an outer circumferential surface spaced inwardly by a predetermined distance and an inner circumferential surface spaced inwardly from both ends of the conduit 10 by a predetermined distance.

Fig. 2 shows another embodiment of the improved pipeline repair structure of the present invention.

Specifically, Fig. 2 (a) shows an embodiment in which the sealing member 200 is extended in series to widely apply the sealing member 200,

Fig. 2 (b) shows an embodiment in which the sealing member 200 is superposed so as to be thick.

3 shows another embodiment of the improved pipeline repair structure of the present invention.

3, an elastic sealing washer 300 is attached to an inner surface of the liner 100, and an anchor 400 is attached to the inner surface of the liner 100 and the elastic sealing member 200 The expansion and contraction seal washer 300 is positioned between the anchor head of the anchor 400 and the inner surface of the liner 100 to penetrate the anchor 400, And is partially pushed into the hole to seal it.

At this time, the expansion and contraction sealing washer 300 and the expansion and contraction sealing material 200 function to fill gaps due to their own elasticity, and in particular, they function to close and seal the gaps formed by the anchors 400.

Fig. 6 is an enlarged view of Fig.

Describing in detail on the basis of Fig. 6,

6, the elastic sealing washer 300 is pushed by the penetration hole of the anchor 400 while being positioned between the anchor head of the anchor 400 and the inner surface of the liner 100 And seals the gap between the anchor (400) and the liner (100) by contacting the elastic sealing material (200) ".

Therefore, not only the elastic sealing washer 300 primarily prevents the water pressure from the outside but also fills the space of the penetration hole of the anchor 400, so that it is possible to completely block the water pressure by preventing the water pressure secondarily.

The present invention is characterized in that the liner 100 is fixed at the upper portion because the elastic sealing washer 300 is partially pushed into the penetration hole of the anchor 400 to seal the liner 100 and the anchor 400 tightly. And a structure corresponding to the expansion and contraction of the liner 100 with a structure fixed at a penetration hole at the same time.

Therefore, the gap, which may be generated by the expansion and contraction of the liner 100, is filled with the elasticity of the stretchable washer 300 itself, so that the liner 100 is fixed more strongly and flexibly.

Particularly, if a screw thread or a projection is formed on the outer circumferential surface of the anchor 400, the effect of penetration of the expansion and contraction sealing washer 300 can be enhanced, and the tip of the anchor 400 can be shaped like an arrowhead, It is possible to form the inner wall of the conduit 10 well.

The anchor 400 may be inserted into the hole of the anchor 400 so that the anchor 400 may penetrate through the hole, The hole due to the tip of the sealing member 400 is filled with the sealing member 200, so that the maintenance effect can be maintained.

When the liner 100 is fixed to the pipeline 10 by the anchor 400 without the expansion and contraction sealing washer 300, if the liner 100 contracts and expands due to a temperature change or the like, The penetration hole can be enlarged. However, since the expansion and contraction seal washer 300 covers the penetration hole, the maintenance and waterproof effect is maintained.

The following photograph is the above-described stretch sealing material 200 manufactured by the inventor of the present invention.

Figure pat00003

The stretchable sealing material 200 or the stretchable sealing washer 300 is an iso-butylene-based adhesive material and stretchable water-expandable adhesive tape. As shown in Fig.

The expansion / contraction sealing member 200 or the expansion / contraction sealing washer 300 should have elasticity and elasticity so as to be able to respond to displacement, and should not be water permeable. When moisture is applied, the expansion and contraction sealant should be expanded by 100% or more. Also, it has an adhesive force, and when it is overlapped, the hermeticity is maintained naturally.

The expansion / contraction sealing member 200 or the expansion / contraction sealing washer 300 is expanded after a predetermined time has elapsed from contact with water. That is, even if it comes into contact with water during construction, it should expand after construction is completed.

This is because it should not interfere with construction by expanding contact with water during repair work.

The characteristics of the water expandable adhesive tape are as follows.

(1) Since the material itself has adhesive property, the workability is excellent.

   - Water Expansion Adhesive tape has its own adhesive property, so it is easy to work by attaching itself to the pipe even if it is turned to PE pipe at the time of construction.

(2) It expands when it comes into contact with water.

(3) Since it expands after a certain period of time after contact with water, it does not inflate in advance before construction and does not interfere with construction.

(4) Expansion time The expansion time and the expansion ratio can be arbitrarily selected by adjusting the mixing conditions in the production of the adhesive tape.

2. Improved pipeline maintenance structure and its construction method

Figs. 4 and 5 show the construction method of the improved pipeline repair structure of the present invention in order.

The method for constructing the improved pipeline repair structure of the present invention is a method for constructing the improved pipeline repair structure,

(1) a liner inserting step of inserting the liner 100 in a U-shaped folded state in an old or damaged channel 10 as shown in Fig. 4 (a);

(2) a liner cutting step of cutting the liner 100 with an allowance of both ends as shown in Fig. 4 (b);

(3) As shown in FIG. 4 (c), the elastic sealing material 200 is attached to the outer peripheral surfaces of both ends of the liner 100 so that the stop of the elastic sealing material 200 is positioned at both ends of the channel 10 A winding and sealing reinstall step;

(4) As shown in FIG. 4 (d), both ends of the liner 100 are closed and the outer peripheral surface of the liner 100 is expanded by using the steam injector (not shown) A liner expanding step of pressurizing the inside of the liner (100) so as to be in close contact with the liner (100);

(5) a cooling step of injecting cold air into the liner (100) to fix the expanded state of the liner (100); And

(6) As shown in FIG. 4 (e), a finishing step of cutting the combined body of the elastic sealing material 200 and the liner 100 so as to coincide with both ends of the channel 10;

And a control unit.

Another embodiment of the method for constructing the improved pipeline repair structure of the present invention is a method for constructing the improved pipeline repair structure shown in FIG. 3,

(1) a liner inserting step of inserting the liner 100 in a U-shaped folded state in an old or damaged channel 10 as shown in Fig. 4 (a);

(2) a liner cutting step of cutting the liner 100 with an allowance of both ends as shown in Fig. 4 (b);

(3) As shown in FIG. 4 (c), the elastic sealing material 200 is attached to the outer peripheral surfaces of both ends of the liner 100 so that the stop of the elastic sealing material 200 is positioned at both ends of the channel 10 A winding and sealing reinstall step;

(4) As shown in FIG. 4 (d), both ends of the liner 100 are closed and the outer peripheral surface of the liner 100 is expanded by using the steam injector (not shown) A liner expanding step of pressurizing the inside of the liner (100) so as to be in close contact with the liner (100);

(5) a cooling step of injecting cold air into the liner (100) to fix the expanded state of the liner (100);

(6) As shown in FIG. 4 (e), a finishing step of cutting the combined body of the elastic sealing material 200 and the liner 100 so as to coincide with both ends of the channel 10; And

(7) a reinforcing step of installing and reinforcing the expansion / contraction sealing washer 300 and the anchor 400;

And a control unit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

It is therefore intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

10: Pipeline
100: Liner
200: New sealing material
300: Newly sealed washer
400: Washer

Claims (4)

To repair an old or damaged underground pipe 10,
A liner (100) inserted into the pipeline (10) and having both ends at both ends of the pipeline (10); And
And an elastic sealing member 200 installed between the outer peripheral surfaces of both ends of the liner 100 and the inner peripheral surfaces of both ends of the pipeline 10,
The elastic sealing member 200 is wound on the liner 100 in a folded U shape and then extends the liner 100 to a steam injector so that the outer circumferential surface of the liner 100 passes through the pipe 10 The inner surface of both ends of the liner 100 and the inner surfaces of both ends of the channel 10 are sealed while maintaining watertightness,
A sealing washer 300 is attached to the inner surface of the liner 100,
When the anchor 400 penetrates the liner 100 and the sealing member 200 and is embedded in the inner wall of the conduit 10,
Wherein the expansion and contraction seal washer (300) is partially pushed by the penetration hole of the anchor (400) while being positioned between the anchor head of the anchor (400) and the inner surface of the liner (100) .
The method of claim 1,
The expansion and contraction sealing material 200 or the expansion and contraction sealing washer 300 is an iso-butylene-based adhesive performance and stretchable water-
Characterized in that it is rolled in the form of a roll accompanied by a volcanic as in double-sided tape at the time of manufacture.
3. The method of claim 2,
Wherein the expansion and contraction sealing member (200) or the expansion and contraction sealing washer (300) expands after a predetermined time has elapsed from contact with water.
A method for constructing an improved pipeline repair structure according to claim 1,
(1) a liner inserting step of inserting the liner 100 in a state of being folded in a U shape into an old or damaged pipeline 10;
(2) a liner cutting step of cutting the liner (100) with an allowance at both ends;
(3) winding the stretchable sealing member 200 around the outer peripheral surfaces of both ends of the liner 100 so that the stop of the stretchable sealing member 200 is positioned at both ends of the channel 10;
(4) The both ends of the liner 100 are sealed and the inner surface of the liner 100 is extended so that the outer circumferential surface of the liner 100 is expanded using the steam injector (not shown) A liner expansion step for pressurizing at a high temperature;
(5) a cooling step of injecting cold air into the liner (100) to fix the expanded state of the liner (100);
(6) a finishing step of cutting the combined body of the elastic sealing material (200) and the liner (100) so as to coincide with both ends of the channel (10); And
(7) a reinforcing step of installing and reinforcing the expansion / contraction sealing washer 300 and the anchor 400;
Wherein the repairing method comprises the steps of:
KR1020150112551A 2014-10-06 2015-08-10 the improved pipe line repairing structure and the construction method thereof KR101618686B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20140134134 2014-10-06
KR1020140134134 2014-10-06

Publications (2)

Publication Number Publication Date
KR20160040992A true KR20160040992A (en) 2016-04-15
KR101618686B1 KR101618686B1 (en) 2016-05-11

Family

ID=55801798

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150112551A KR101618686B1 (en) 2014-10-06 2015-08-10 the improved pipe line repairing structure and the construction method thereof

Country Status (1)

Country Link
KR (1) KR101618686B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107606380A (en) * 2017-09-29 2018-01-19 北京中财万鑫科技有限公司 A kind of pipe renovating system and method
KR20180125712A (en) * 2017-05-16 2018-11-26 정호근 Device for maintaining circle type of tube for reparing water pipe
CN112303373A (en) * 2020-10-30 2021-02-02 上海水业设计工程有限公司 A exempt from to excavate patching device for PCCP pipeline interface leaks

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU201881U1 (en) * 2020-07-24 2021-01-19 Общество С Ограниченной Ответственностью Группа Компаний «Пластик» MODULE OF THE INNER PIPE OF THE PIPELINE RESTORED BY THE PIPE-FREE METHOD

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4931559B2 (en) * 2006-11-16 2012-05-16 株式会社クボタ Pipe repair method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180125712A (en) * 2017-05-16 2018-11-26 정호근 Device for maintaining circle type of tube for reparing water pipe
CN107606380A (en) * 2017-09-29 2018-01-19 北京中财万鑫科技有限公司 A kind of pipe renovating system and method
CN112303373A (en) * 2020-10-30 2021-02-02 上海水业设计工程有限公司 A exempt from to excavate patching device for PCCP pipeline interface leaks

Also Published As

Publication number Publication date
KR101618686B1 (en) 2016-05-11

Similar Documents

Publication Publication Date Title
KR101618686B1 (en) the improved pipe line repairing structure and the construction method thereof
JP5185819B2 (en) In-situ curable liner double gland air pressure reversal insertion and steam curing method
US8783297B2 (en) Robotic system for pipeline rehabilitation
US20180017463A1 (en) Method for forming pressure-testable field joint between pre-insulated pipe sections, and piping system with pressure-testable field joint
JP6144125B2 (en) Pipe lining method and pipe lining pipe
US3261374A (en) Method and means for sealing leaking pipes
KR101183195B1 (en) Improved water pipe connection structure and water pipe repair method using the same
CN109854819B (en) Special waterproof structure for wall-penetrating pipeline and construction method thereof
RU2389943C1 (en) Heat insulated joint of previously heat insulated pipes with polymer shell, method of its assembly, polymer coupling and method of its manufacturing
KR20180099125A (en) Waterproofing structure and method for waterproofing between the wall and the pipe
US20190056054A1 (en) Method and Apparatus for Rehabilitation of Water Conduit with Lateral Openings
KR101458358B1 (en) Repair water pipes connected to the structure by using an improved method
KR20210099385A (en) Heat shrink casing for double heat insulation tube, method for manufacturing heat shrink casing for double heat insulation tube and method for constructing heat shrink casing for double heat insulation tube
RU2667856C1 (en) Chuiko method for internal monolithic insulation of welded pipe joint (options)
RU2267687C1 (en) Thermally shrinkable coupling
CA3078181A1 (en) Device for the internal monolithic insulation of a welded pipeline joint
WO2015147679A1 (en) Method for thermally insulating welded joints of pre-insulated pipes
WO2015147677A1 (en) Method for anti-fire insulation and thermal insulation of welded joints of pre-insulated pipes during above-ground pipeline laying
KR20170031876A (en) Method for constru cting repair of connection in double insulation pipe using outer jacket
JP2003291216A (en) Method for recycling existing tube and recycled tube lead-in member used for the same
CA2942813A1 (en) Method for thermally insulating welded joints for pre-insulated pipes
JP4625165B2 (en) Rehabilitation method for connecting pipe connections of sewer pipes
CA3097790A1 (en) Pipe connection system and method for producing a pipe connection
RU2527282C2 (en) External insulation of pipeline joint of steel pipes with outer coating
KR101370621B1 (en) Method for constructing repair of double ins ulation pipe

Legal Events

Date Code Title Description
A201 Request for examination
A302 Request for accelerated examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
FPAY Annual fee payment

Payment date: 20190408

Year of fee payment: 4