DE2726091C2 - Procedure for the internal sealing of pipe socket connections '' - Google Patents

Procedure for the internal sealing of pipe socket connections ''

Info

Publication number
DE2726091C2
DE2726091C2 DE2726091A DE2726091A DE2726091C2 DE 2726091 C2 DE2726091 C2 DE 2726091C2 DE 2726091 A DE2726091 A DE 2726091A DE 2726091 A DE2726091 A DE 2726091A DE 2726091 C2 DE2726091 C2 DE 2726091C2
Authority
DE
Germany
Prior art keywords
expansion body
sealing
sealing agent
core
pipe
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.)
Expired
Application number
DE2726091A
Other languages
German (de)
Other versions
DE2726091B1 (en
Inventor
Karl-Friedrich 6000 Frankfurt Osten
Kurt 4100 Duisburg Peitz
Herbert Ing.(Grad.) 5620 Velbert Wimmershoff
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to DE2726091A priority Critical patent/DE2726091C2/en
Publication of DE2726091B1 publication Critical patent/DE2726091B1/en
Application granted granted Critical
Publication of DE2726091C2 publication Critical patent/DE2726091C2/en
Expired 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
    • F16L55/163—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a ring, a band or a sleeve being pressed against the inner surface of 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
    • B29C63/28—Lining or sheathing of internal surfaces applied by "rubber" bag or diaphragm
    • 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
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5324—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length
    • B29C66/53241—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being tubular and said substantially annular single elements being of finite length relative to the infinite length of said tubular articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B29C66/612—Making circumferential joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/63—Internally supporting the article during joining
    • B29C66/634—Internally supporting the article during joining using an inflatable core
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Landscapes

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

Description

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (1)

Patentanspruch:Claim: Vorrichtung zur Durchführung des Verfahrens zum inneren Abdichten von Rohrmuffenverbindungen, insbesondere der Stemmuffenverbindungen von Erdgasrohrleitungen, nach Patent P 24 40 086, wobei ein das Abdichtungsmaterial tragender hohlzylindrischer und elastischer Dehnkörper in die Rohrleitung eingebracht und das Abdichtungsmittel durch Aufweiten des Dehnkörpers mittels Zufuhr von Druckluft an den inneren Ringspalt der Muffenverbindung angepreßt wird, wobei eine das Abdichtungsmittel tragende und den Dehnkörper umgebende Hfllse aus thermoplastischem Kunststoff, vorzugsweise Polyvinylchlorid, durch elektrische Widerstandserhitzung auf Erweichungstemperatur erwärmt, dann mit dem Abdichtungsmittel an die Rohrinnenwand angepreßt und anschließend im angepreßten Zustand bis zur Verfestigung abgekühlt wird, worauf der Dehnkörper entlastet und aus der Rohrleitung entfernt wird, dadurch gekennzeichnet, daß das für die Erhitzung der Hülse (11) dienende Widerstandsheizelement aus einer monofilaren Wicklung eines an eine Stromquelle angeschlossenen metallischen Drahtes oder Streifens (24) gebildet ist, welche in mehreren längsgerichteten Schlaufen den Dehnkörper (S) axial umschließt, die im Abstand voneinander angeordnet sind und mit ihren Enden (2S) an Ringscheiben (26) aus einem isolierenden Werkstoff befestigt sind, welche auf je ein.Trc zum Zuführen der Druckluft in den Kern (4) dienenden Anschlußstutzen (28) axial angeordnet sind und sich gegen Jmckfedern (27) abstützten, die zwischen den Ringscheiben (26) und dem Kern (4) auf dem AnschLßstutzen (28) angeordnet sind.Device for carrying out the method for the internal sealing of pipe socket connections, in particular the socket joints of natural gas pipelines, according to patent P 24 40 086, wherein a hollow cylindrical and elastic expansion body carrying the sealing material into the pipeline introduced and the sealing agent by expanding the expansion body by supplying Compressed air is pressed against the inner annular gap of the socket connection, one of the sealing means load-bearing sleeve made of thermoplastic material surrounding the expansion body, preferably polyvinyl chloride, by electrical resistance heating to softening temperature heated, then pressed against the inner wall of the pipe with the sealing agent and then im pressed state is cooled until solidification, whereupon the stretch body is relieved and out of the Pipeline is removed, characterized that the for heating the sleeve (11) serving resistance heating element from a monofilar winding of a metallic wire or strip connected to a power source (24) is formed, which axially extends the stretch body (S) in several longitudinal loops which are arranged at a distance from one another and with their ends (2S) on annular disks (26) made of an insulating material are attached, which on each ein.Trc for supplying the compressed air in the core (4) serving connecting pieces (28) are arranged axially and against Jmckfedern (27) between the washers (26) and the core (4) on the connecting piece (28) are arranged. Die Erfindung bezieht sich auf eine Vorrichtung nach dem Oberbegriff des Patentanspruchs.The invention relates to a device according to the preamble of the patent claim. Nach dem Hauptpatent P 24 40 086 werden undicht gewordene Rohrmuffenverbindungen, insbesondere Stemmuffenverbindungen von Erdgasrohrleitungen, von der Rohrinnenseite her in der Weise abgedichtet, daß ein das Abdichtungsmittel tragender hohlzylindrischer und elastischer Dehnkörper in die Rohrleitung eingebracht und das Abdichtungsmittel durch Aufweiten des Dehnkörpers mittels Zufuhr von Druckluft an den inneren Ringspalt der Muffenverbindung angepreßt wird, worauf der Dehnkörper entlastet und aus der Rohrleitung entfernt wird. Dabei wird nach dem Hauptpatent mit dem Dehnkörper eine das Abdichtungsmittel tragende und den Dehnkörper umgebende Hülse au« thermoplastischem Kunststoff, vorzugsweise Polyvinylchlorid, in den Bereich der Muffenverbindung gebracht, auf Erweiterungstemperatur erwärmt, dann durch Aufweiten des Dehnkörpers zusammen mit dem Dichtungsmittel an die Rohrinnenwand angepreßt und anschließend in angepreßtem Zustand bis zur Verfestigung abgekühlt wird, worauf der Dehnkörper aus der Rohrleitung entfernt wird. Die Erwärmung der thermoplastischen Kunststoffhülse erfolgt dabei unter anderem durch elektrische Widerstandserhitzung.
Der Erfindung liegt die Aufgabe zugrunde, eine elektrische Widerstands-Heizung für die Erhitzung uer das Abdichtungsmittel tragenden thermoplastischen Kunststoffhülse derart weiterzubilden, daß sie mit der gesamten Umfangsfläche der Kunststoffhülse für eine gleichmäßige, direkte Wärmeübertragung in Kontakt gebracht wird und wiederholt verwendet werden ka nn.According to the main patent P 24 40 086, pipe socket connections that have become leaky, in particular socket connections of natural gas pipelines, are sealed from the inside of the pipe in such a way that a hollow cylindrical and elastic expansion body carrying the sealing agent is introduced into the pipe and the sealing agent is introduced by expanding the expansion body by supplying compressed air is pressed against the inner annular gap of the socket connection, whereupon the expansion body is relieved and removed from the pipeline. According to the main patent, a sleeve made of thermoplastic material, preferably polyvinyl chloride, which carries the sealing agent and surrounds the expansion body, is brought into the area of the socket connection with the expansion body, heated to expansion temperature, then pressed against the pipe inner wall by expanding the expansion body together with the sealing material and is then cooled in the pressed state until solidification, whereupon the expansion body is removed from the pipeline. The thermoplastic plastic sleeve is heated, among other things, by means of electrical resistance heating.
The invention is based on the object of developing an electrical resistance heater for heating the thermoplastic plastic sleeve carrying the sealing agent in such a way that it is brought into contact with the entire circumferential surface of the plastic sleeve for uniform, direct heat transfer and can be used repeatedly. Gelöst wird die Aufgabe mit den im Kennzeichen des Patentanspruchs angegebenen Mitteln.The problem is solved with the means indicated in the characterizing part of the patent claim. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung im Längsschnitt dargestellt.In the drawing, an embodiment of the invention is shown in longitudinal section. Der starre Kern 4 des Gerätes ist in bekannter Weise von dem elastischen Schlauchstück 5 umgeben, welches an den Stirnenden des Kernes befestigt ist. und weist an seinen beiden Enden je einen rohrförmigen Anschlußstutzen 28 auf, der zum Zuführen der Druckluft dient Das zum Erhitzen der thermoplastischen Kunststoffhülse 11 auf ihre Erweichungstemperatur dienende Widerstandsheizelement ist durch die monofile Wicklung des dünnen Kupferstreifens 24 gebildet, der in mehreren längsgerichteten Schlaufen den Kern 4 und das Schlauchstück 5 in Achsrichtung umgibt Die Schlaufen liegen im Abstand voneinander und sind mit ihren Enden 25 um je eine Ringscheibe 26 herumgeführt. Diese Scheiben bestehen aus einem nicht leitenden Material und sind auf den Anschlußstutzen 28 gleitend angeordnet Zwischen jeder Scheibe und dem Kern befindet sich eine Druckfeder 27, weiche die Schlaufen 24 unter Vorspannung hältThe rigid core 4 of the device is in a known manner surrounded by the elastic tube piece 5, which is attached to the front ends of the core. and instructs its two ends each have a tubular connection piece 28 which is used to supply the compressed air The one used to heat the thermoplastic plastic sleeve 11 to its softening temperature Resistance heating element is formed by the monofilament winding of the thin copper strip 24, which in FIG a plurality of longitudinal loops surrounds the core 4 and the tube piece 5 in the axial direction Loops are at a distance from one another and are guided with their ends 25 around an annular disk 26. These disks consist of a non-conductive material and slide on the connecting piece 28 arranged between each disc and the core is a compression spring 27, soft the loops 24 holds under tension Das Abdichten der Muffenverbindung 3 erfolgt gemäß dem Hauptpatent Hierfür wird den beiden nebeneinanderliegenden Enden 17, 18 rtes das Widerstandsheizelement bildenden Streifens 24 der Heizstrom zugeführt, wodurch die darüberliigende Kunststoffhülse 11 auf Erweichungstemperatur erwärmt wird. Bei dem nachfolgenden Zuführen der Druckluft drückt das elastische Schlauchstück 5 die Schlaufen des Streifens 24 radial nach außen, wobei die Scheiben 26 gegen den Druck der Federn 27 auf den Anschlußstutzen 28 nach innen gleiten. Dabei wird gleichzeitig die erweichte Kunststoffhülse 11 mit dem Abdichtungsmittel 14 und den Dichtungsringen 23 an die Verbindungsstelle der Rohre 1 und 2 gepreßt. Nach der Entlastung des Dehnkörpers bewirken die Federn 27 die Rückfüh rung der Scheiben 26 und damit die Streckung des Widerstandsheizelementes in die Ausgangsposition, so daß dieses mit dem Dehnkörper aus der Rohrleitung herausgezogen und für einen neuen Anwendungsfall verwendet werden kann.The socket connection 3 is sealed according to the main patent for this purpose is the two adjacent ends 17, 18 rtes the resistance heating element forming strip 24 supplied the heating current, whereby the overlying plastic sleeve 11 is heated to softening temperature. When the compressed air is subsequently fed in, presses the elastic hose piece 5 the loops of the strip 24 radially outwards, wherein the discs 26 slide against the pressure of the springs 27 on the connecting piece 28 inward. At the same time, the softened plastic sleeve 11 with the sealing agent 14 and the sealing rings 23 pressed against the connection point of the tubes 1 and 2. After the discharge of the stretch body, the springs 27 cause the Rückfüh tion of the discs 26 and thus the stretching of the Resistance heating element in the starting position, so that this with the expansion body from the pipeline can be pulled out and used for a new application.
DE2726091A 1977-06-07 1977-06-07 Procedure for the internal sealing of pipe socket connections '' Expired DE2726091C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2726091A DE2726091C2 (en) 1977-06-07 1977-06-07 Procedure for the internal sealing of pipe socket connections ''

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2726091A DE2726091C2 (en) 1977-06-07 1977-06-07 Procedure for the internal sealing of pipe socket connections ''

Publications (2)

Publication Number Publication Date
DE2726091B1 DE2726091B1 (en) 1978-08-17
DE2726091C2 true DE2726091C2 (en) 1979-04-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE2726091A Expired DE2726091C2 (en) 1977-06-07 1977-06-07 Procedure for the internal sealing of pipe socket connections ''

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4394202A (en) * 1981-01-22 1983-07-19 Umac, Inc. Method for relining an underground gas line or the like without excavation
EP0159300A1 (en) * 1984-03-30 1985-10-23 Stig Westman Repair sleeve for piping

Also Published As

Publication number Publication date
DE2726091B1 (en) 1978-08-17

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Legal Events

Date Code Title Description
BGA New person/name/address of the applicant
8340 Patent of addition ceased/non-payment of fee of main patent