DK167720B1

DK167720B1 - PRESSURE MUFF TO CONNECT TWO CABLES

Info

Publication number: DK167720B1
Application number: DK565789A
Authority: DK
Inventors: Helmut Haag; Rolf Lindlar; Wolfgang Stremme
Original assignee: Rheydt Kabelwerk Ag
Priority date: 1988-11-29
Filing date: 1989-11-10
Publication date: 1993-12-06
Also published as: DK565789A; FI895191A0; DK565789D0; FI95091C; ATE100977T1; ES2049283T3; EP0371203A3; EP0371203B1; DE3840139A1; FI95091B; DE58906822D1; EP0371203A2

Abstract

In the case of a pressure-proof sleeve for connecting two cables having two half-shells, by means of which a cavity for splice reception is constructed, having transition pieces for the cable ends, which are placed on an inner cable sheath, and clips for clamping on the armouring wires or strain relief elements, it is provided that the transition pieces are constructed as corrugated tubes and are arranged over the conically constructed ends of the divided sleeve and the de- sheathed ends of the cable, that a first shrink-on collar is applied which extends over the sleeve and the corrugated tubes and closes sealingly against the inner cable sheath, that the strain relief elements are distributed over the circumference of the first shrink-on collar, that there are provided in each case at the ends of the cone and in the middle of the sleeve clips which non-positively connect the strain relief elements to the sleeve, and that a second shrink-on collar is applied over the entire structure.

Description

DK 167720 B1DK 167720 B1

TRYKTÆT MUFFE TIL FORBINDELSE AF TO KABLERPRESSURE MUFF TO CONNECT TWO CABLES

Opfindelsen vedrører en tryktæt muffe til forbindelse af to 5 kabler, hvilken tryktætte muffe omfatter et af to halvskåle bestående muffelegeme til dannelse af et hulrum til optagelse af en splejsning mellem kablerne og overgangsstykker til de isolerede og for kappe frilagte kabelender samt klemmebøjler for tilklemning af armeringstråde eller træk-10 aflastningselementer.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a pressure-tight sleeve for connecting two cables, said pressure-tight sleeve comprising one of two half-shells for forming a cavity for accommodating a splice between the cables and junctions for the insulated and sheath-exposed cable ends and clamping arms for clamping arms. or tensile relief elements.

Til forbindelse af kabler anvendes muffer såvel ved kabler til udlægning i jorden som til søkabler. De skal holde fugtighed borte fra splejsningen, som befinder sig i muffen, 15 også ved længere lagring og ved temperatursvingninger. Udefra skal mufferne være beskyttede, så de er bestandige mod de korrosionsangreb, der kan forventes. Såfremt mufferne har et metalhus, skal dette være forbundet med kablets li-leder eller den metalliske kabelkappe eller -skærm. Muffe-20 huset bliver derved berøringssikkert og tjener samtidig som jord. Under udlægning udsættes kablerne og mufferne for bøjningsbelastninger, der kan gøre de benyttede samlinger eller muffer utætte.Cables are used for connecting cables both for cables for laying in the ground and for submarine cables. They must keep moisture away from the splicing that is in the socket, also for longer storage and for temperature fluctuations. From the outside, the sleeves must be protected so that they can withstand the expected corrosion attacks. If the sleeves have a metal housing, this must be connected to the cable conductor or the metallic cable sheath or shield. The sleeve-20 housing thereby becomes touch-safe and at the same time serves as soil. During laying, the cables and sockets are subjected to bending loads which can make the joints or sockets used leak.

25 Fra EP offentliggørelsesskrift nr. 0 071 482 kendes en tryktæt muffe i alt væsentligt af den ovenfor anførte art.25 From EP Publication No. 0 071 482 a pressure-tight sleeve is known essentially of the kind mentioned above.

Den kendte tryktætte muffe er beregnet for energikabler, hvor området ved overgangen mellem muffelegemet og kablernes kapper er dækket ved hjælp af en krympeslange. Overgan-30 gen mellem kabelenderne og muffelegemet er dannet af en indføringscylinder af et stift stål- eller aluminiumsrør.The known pressure-tight sleeve is intended for energy cables, where the area at the transition between the sleeve body and the sheaths of the cables is covered by a shrink tube. The transition between the cable ends and the sleeve body is formed by an insertion cylinder of a rigid steel or aluminum tube.

Denne indføringscylinder er ikke fleksibel og er derfor uegnet til at tjene som beskyttelse mod bøjningsbelastnin-35 ger under udlægning af kablerne, idet indføringscylinderen i stedet for er tilbøjelig til at revne.This insertion cylinder is not flexible and is therefore unfit to serve as protection against bending stresses during laying of the cables, the insertion cylinder being prone to cracking.

22

L/Iv ΙΌ 1 I Ο IL / Iv ΙΌ 1 I Ο I

Til grund for opfindelsen ligger den opgave at angive en tryktæt muffe af den i indledningen nævnte slags, som sikrer beskyttelse mod korrosion og tryktæthed ved hjælp af 5 krympemanchetter, og ikke ved en udstøbningsmasse, hvorhos muffen også skal være fleksibel, så kablerne ved overgangen til muffen ikke udsættes for bøjninger, som kan gøre muffen utæt.The object of the invention is to provide a pressure-tight sleeve of the kind mentioned in the introduction, which provides protection against corrosion and pressure-tightness by means of 5 shrink sleeves, and not by a casting material, which also has to be flexible so that the cables at the transition to the sleeve is not exposed to bends which can make the sleeve leak.

10 Fordelen ved en sådan muffe skal ses deri, at splejsningen er bedre tilgængelig ved nødvendige reparationer. Det har vist sig, at udstøbningsmassen ikke tillader en hurtig reparation, da den kun kan fjernes med stort tidsforbrug, og at udstøbningsmassen heller ikke tillader nogen særlig 15 kraftig bøjning af forbindelsen.10 The advantage of such a sleeve must be seen in that the splice is more readily available during necessary repairs. It has been found that the casting mass does not allow for a quick repair, since it can only be removed with great time consumption, and that the casting mass also does not allow any particularly strong bending of the joint.

Denne opgave løses ved en muffe af den i indledningen nævnte slags, hvilken tryktætte muffe ifølge opfindelsen er særegen ved, at overgangsstykkerne er udformet som bølge-20 rør, af hvilke den første ende dækker den isolerede kabelende, og den modstående anden ende dækker den ende af muffelegemet, der vender mod kabelenden, at en første krympe-manchet er lagt på og strækker sig over muffelegemet og bølgerørene og lukker tæt til den isolerede kabelende, at 25 trækaflastningselementerne er fordelt over omkredsen af den første krympemanchet, at der ved muffelegemets midte og ved dets ender er anbragt klemmebøjler, som forbinder trækaflastningselementerne kraftoverførende med muffelegemet, og at der over hele opbygningen er anbragt en anden krympeman-30 chet.This task is solved by a sleeve of the kind mentioned in the preamble, which pressure-tight sleeve according to the invention is peculiar in that the transition pieces are formed as corrugated tubes, the first end covering the insulated cable end and the opposite second end covering the end. of the muffle body facing the cable end, that a first shrink sleeve is applied and extends over the muffle body and corrugated tubes and closes tightly to the insulated cable end, that the tensile relief elements are distributed over the circumference of the first shrink sleeve, that at the center of the muffle body and at its ends, clamping brackets are provided which connect the tension relief elements to the muffle body and that a second shrink sleeve is arranged over the entire structure.

Fordelagtige videreudformninger af opfindelsen er angivet i de uselvstændige krav.Advantageous embodiments of the invention are set forth in the dependent claims.

35 Anvendelsesområder for opfindelsen er jord- og søkabler, fremfor alt til kommunikationsteknik. Fortrinsvis egner op- 3 DK 167720 B1 findelsen sig til frembringelse af lysledersplejsninger.Areas of application of the invention are ground and sea cables, above all for communication technology. Preferably, the invention is suitable for generating optical conductor splices.

Fordelene i forhold til de hidtil sædvanlige muffer består deri, at monteringen af muffen lettes, at ved kommunikati-5 onskabler, især lyslederkabler, er muffelegemets indre let tilgængeligt, og en reparation kan ske hurtigt. Endvidere bliver den færdige forbindelse mellem de to kabler forholdsvis fleksibel, så den tryktætte muffe vedbliver at være tæt efter fuldført udlægning af jord- eller søkablet.The advantages over the conventional sleeves are that the mounting of the sleeve is facilitated, that by means of communication cables, especially fiber-optic cables, the interior of the sleeve body is easily accessible and a repair can be done quickly. Furthermore, the finished connection between the two cables becomes relatively flexible, so that the pressure-tight socket remains close after completion of laying of the ground or submarine cable.

1010

Et udførelseseksempel på opfindelsen forklares i det følgende nærmere ved hjælp af tegningen.An exemplary embodiment of the invention will now be described in more detail with reference to the accompanying drawings.

Figuren viser et af to halvskåle bestående muffelegeme 1, 15 som ved hjælp af en konisk del 3 ved hver ende og derover skubbede metalkapper i form af bølgerør 4 forbinder muffelegemets 1 ender med de to kablers med isolering forsynede kabelender 2, hvorfra de afisolerede kabler strækker sig ind i muffelegemet 1. Derved tjener bølgerørene 4 som knæk-20 beskyttelse. Kabelenderne 2 er befriet for en omgivende kappe 12. Ved monteringen skubbes først en første krympe-manchet 9 over kabelenderne 2, der som anført er befriet for kappen 12, over bølgerørene 4 og muffelegemet 1, og muffelegemets 1 halvskåle presses efter monteringen af 25 splejsningen forskydningsfast på hinanden. Trækaflastningselementer 8 i form af separate dele fordeles over muffelegemet 1 ensartet over dets omkreds. Ved søkabler består trækaflastningselementerne 8 af armeringstråde, som pålægges over en længde af 1,5 m. Trækaflastningselementerne 8, 30 der strækker sig langs muffelegemet 1, fastgøres ved hjælp af tre klemmebøjler 5, 6 og 7 i forhold til hinanden og i forhold til muffelegemet 1. Den midterste klemmebøjle 5 trykker trækaflastningselementerne 8 ind i en fordybning 10, som løber omkring midten af muffelegemet 1, og har den 35 opgave at forankre trækaflastningselementerne 8 i forhold til muffelegemet 1. Det sker på dette sted ved tilspænding 4 UK 1b//ZU di af klemmebøjlen 5, fordi trækaflastningselementerne 8 derved må følge fordybningens 10 kontur, hvorved der frembringes en god kraftoverførende forbindelse.The figure shows one of two half-cups muffle body 1, 15 which, by means of a conical part 3 at each end and above, push metal sheaths in the form of corrugated pipe 4, connect the ends of the muffle body 1 to the two insulated cables 2, from which the insulated cables extend. penetrate into the sleeve body 1. Thereby, the corrugated tubes 4 serve as crack-20 protection. The cable ends 2 are freed of a surrounding sheath 12. At the mounting, first a first shrink sleeve 9 is pushed over the cable ends 2, which are freed of the sheath 12, over the corrugated tubes 4 and the sleeve body 1 and the half shells of the sleeve body 1 are pressed after mounting the splice. shear-resistant to each other. Tensile relief members 8 in the form of separate parts are distributed evenly over the muffle body 1 over its circumference. In submarine cables, the strain relief elements 8 consist of reinforcing threads which are applied over a length of 1.5 m. The strain relief elements 8, 30 extending along the sleeve body 1 are fixed by means of three clamping brackets 5, 6 and 7 with respect to each other and with respect to the sleeve body. 1. The middle clamping bracket 5 pushes the strain relief elements 8 into a recess 10 which runs around the center of the sleeve body 1 and has the task of anchoring the strain relief elements 8 relative to the sleeve body 1. It occurs at this point by tightening 4 UK 1b // ZU di of the clamping bracket 5, because the tension relief elements 8 must thereby follow the contour of the recess 10, thereby producing a good power transfer connection.

5 Muffelegemet 1 er sideværts forskydningssikret ved hjælp af en langs muffeskålenes skillelinie løbende liste, som er udformet overlappende i forhold til den anliggende modskål. Denne liste er ikke vist på tegningen. Langs listen kan der på den ene skål være anbragt forhøjninger, og på modskålen 10 være udsparinger for at fiksere halvskålene også i aksial retning. På grund af den koniske form indskrænkes den aksi-ale forskydningsmulighed i forvejen.5 The sleeve body 1 is laterally displaceable by means of a list running along the dividing line of the sleeve cups, which is designed to overlap with the abutting cup. This list is not shown in the drawing. Along the list, elevations may be arranged on one bowl and recesses 10 on the counter bowl 10 for fixing the half-dishes also in axial direction. Due to the tapered shape, the axial shear potential is already reduced.

Den træksikre og tryktætte muffe ifølge opfindelsen har 15 uafhængigt af kablets form en høj trækstyrke, da der i muf-feområdet altid findes et forstærket armeringstværsnit. Muffen består fortrinsvis af metal, ligesom påsætningsstykkerne af bølgerør, som sikrer en fleksibel overgang til muffen. Muffen er især anvendelig som reparationsmuffe ved 20 ødelagte kabler.The tensile and pressure proof sleeve according to the invention has a high tensile strength, irrespective of the shape of the cable, since there is always a reinforced cross-section in the sleeve area. The sleeve is preferably made of metal, as are the corrugated pipe attachments, which ensure a flexible transition to the sleeve. The sleeve is particularly useful as a repair sleeve for 20 broken cables.

Fortrinsvis kommer den til anvendelse til søkabler i indsøer, men også i fladvandede havområder, da den uden videre er tryksikker indtil 30 bar og når mindst 90% af kablets 25 trækstyrke.It is preferably used for submarine cables, but also in shallow sea areas, as it is readily pressure-proof up to 30 bar and reaches at least 90% of the cable's tensile strength.

Claims

A pressure-tight sleeve for connecting two cables, said pressure-tight sleeve comprising one of two half-cups sleeve body (1) to form a cavity for receiving a splicing between the cables and transition pieces (4) for the insulated and for casing ( 12) exposed cable ends (2) and clamping brackets for clamping reinforcing wires or tension relief elements, characterized in that the transition pieces (4) are formed as corrugated tubes, the first end of which covers the insulated cable end (2) and the opposite second end the end of the muffle body (1) facing the cable end (2) covers that a first shrink sleeve (9) is applied and extends over the muffle body (1) and the corrugated tubes (4) and closes tightly to the insulated cable end (2) that the tension relief members (8) are distributed over the circumference of the first shrink sleeve (9) that clamping brackets (5 and 6, 7, respectively) are provided at the center and at its ends, which connect the tension relief members The nets 20 (8) transmit power with the muffle body (1) and a second shrink sleeve (11) is arranged over the entire structure.

Pressure-proof sleeve according to Claim 1, characterized in that the sleeve body (1) consists of cups which can be displaceably pressed against each other. A pressure-tight sleeve according to claim 1 or 2, characterized in that a recess (10) is arranged in the middle and around the circumference of the sleeve body (1).