DE1640080B2

DE1640080B2 - TENSION-RESISTANT AND COMPRESSED GAS-TIGHT CONNECTION BETWEEN THE END OF AN ELECTRICAL CABLE AND A PULL HEAD

Info

Publication number: DE1640080B2
Application number: DE19671640080
Authority: DE
Inventors: Franz 5000 Köln Schillings
Original assignee: Feiten & Guilleaume Carlswerk AG, 5000 Köln
Priority date: 1967-03-29
Filing date: 1967-03-29
Publication date: 1972-11-16
Also published as: DE1640080A1

Description

abzuisolieren. Das Abisolieren aller Adern kann auch in einem einzigen Arbeitsgang durch Eintauchen in ein Zinnbad erfolgen. Dieser Vorteil wirkt sich besonders bei vieladrigen Fernmeldekabeln aus.stripping. The stripping of all wires can also be done in a single operation by immersion done in a tin bath. This advantage is particularly effective with multi-core telecommunication cables.

Vor dem Umspritzen mit einem Kunststoff werden der Stahlbecher und gegebenenfalls auch die Zugstange mit einem Haftvermittler, insbesondere einem Copolymer, beschichtet, welcher beispielsweise aus der Lösung oder der Schmelze aufgebracht werden kann. Hierdurch ist ein sicherer, druckgasdichter Abschluß der vom Kunststoff umgebenen Metallteile gewährleistet. Bei Zweimantelkabeln werden durch das Aufspritzen der Kunststoffkappen Innen- und Außenmantel des Kabels gegeneinander abgedichtet. Um auch den Außenmantel auf Beschädigungen hin mit überprüfen zu können, kann man den Raum zwischen Innen- und Außenmantel mit der Kabelseele verbinden, und zwar vornehmlich mit einem U-förmig gebogenen Röhrchen. Das Röhrchen reicht also mit einem Schenkel in den Raum zwischen Innen- und Außenmantel und mit dem anderen Ende in die Kabelseele.Before overmolding with a plastic, the steel cup and possibly also the pull rod with an adhesion promoter, in particular a copolymer, coated, which for example from the solution or the melt can be applied. This creates a secure, pressurized gas-tight seal of the metal parts surrounded by the plastic. In the case of double-sheathed cables, the injection molding of the plastic caps, the inner and outer sheaths of the cable are sealed against each other. In order to also be able to check the outer jacket for damage, the space between Connect the inner and outer sheaths with the cable core, primarily with a U-shape curved tube. One leg of the tube extends into the space between the inner and outer sheath and the other end into the cable core.

An Hand der Zeichnungen sei die Erfindung näher erläutert. Die F i g. 1 zeigt das Ende eines Kabels, wobei 1 den aus Kunststoff bestehenden Kabelmantel und 2 das etwa 10 bis 20 mm aus dem Mantel herausragende Aderbündel darstellen. Durch Eintauchen des Aderbündels in ein vorerhitztes Zinnbad schmilzt die Aderisolierung, sofern sie aus einem Kunststoff besteht, weg, und die freien Kupferadern werden verzinnt. Aber auch papierisolierte Hohlraumadern sind zur Weiterverarbeitung geeignet, da deren Leiter bei der gleichen Behandlung verzinnt wird. Der Ziehkopf besteht, wie Fig.2 zeigt, aus dem Stahlbecher 3, der mit der Zugöse 6 durch eineThe invention will be explained in more detail with reference to the drawings. The F i g. 1 shows the end of a cable, where 1 is the plastic cable jacket and 2 is about 10 to 20 mm from the jacket represent outstanding bundles of wires. By immersing the vein bundle in a preheated tin bath The core insulation, if it is made of a plastic, melts away, and the free copper cores are tinned. But paper-insulated veins are also suitable for further processing, as their Conductor is tinned with the same treatment. As shown in Fig. 2, the pulling head consists of the steel cup 3, which is connected to the towing eye 6 by a

ίο Zugstange 5 verbunden ist. Der mit flüssigem Lötzinn gefüllte Stahlbecher 3 wird über das Aderbündel geschoben, so daß nach dem Erkalten des Lötzinns 4 eine feste Verbindung zwischen den Adern des Aderbündels und dem Ziehkopf besteht. Mit der Lötverbindung ist die Zugfestigkeit gewährleistet. Nach dem Aufbringen eines Haftvermittlers auf den Stahlbecher 3 und einen Teil der Zugstange 5 werden diese und das Kabelende 1 mit Kunststoff umspritzt (F i g. 3). Die Kunststoffumspritzung gewährleistet den druckgasdichten Abschluß des Kabelendes. In Fig.4 ist ein Kabel mit einem Innenmantel9 und einem Außenmantel 1 dargestellt. Ein U-förmiges Röhrchen 8 verbindet den Raum zwischen den Mänteln 1 und 9 mit der Kabelseele. Durch diese Maßnähme wird auch der Außenmantel 9 in die Überprüfung auf Beschädigungen beim Verlegen einbezogen.ίο tie rod 5 is connected. The one with liquid solder The filled steel cup 3 is pushed over the bundle of wires so that after the solder 4 there is a permanent connection between the wires of the wire bundle and the pulling head. With the solder joint the tensile strength is guaranteed. After applying an adhesion promoter to the steel cup 3 and part of the pull rod 5, this and the cable end 1 are encapsulated with plastic (Fig. 3). The plastic encapsulation ensures that the end of the cable is sealed against pressurized gas. In Fig.4 is a cable with an inner sheath9 and an outer jacket 1 is shown. A U-shaped tube 8 connects the space between the jackets 1 and 9 with the cable core. As a result of these measures, the outer jacket 9 is also included in the review included for damage during laying.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 on the connection of the cast resin with the relative patent claims: long wire ends, folded by 180 °, free of insulation, while the compressed gas-tight seal

1. Tensile and pressurized gas-tight connection The end of the cable by connecting the casting element with a plastic sheathing - 5 resin is secured with the cable sheath.

nen cable with a pulling head, which means that it is from the German utility model 1916375

indicates that the wire ends (2) also have become known, smooth cable sheath made of

a steel sheet connected to the drawbar eye (6) with a bead running in the circumferential direction

rather (3) are soldered in and the steel cup (3) is to be provided and a with and the end of the cable jacket (1) tightly with a cap filled with a hardening casting resin

Plastic are overmolded, between which there is a pulling eye to be pushed.

Steel cup (3) and the plastic encapsulation The bead running in the cable sheath enables

(7) an adhesion promoter, in particular a copo- a better connection with regard to tensile loads

Lymerschicht, is introduced. between the cap and the cable jacket. At art

2. Connection according to claim 1, characterized by 15 fabric sheaths, this type of connection is already characterized that the adhesion promoter from the deletion does not promise success that the introduction Solution or melt on the steel cup with permanent beads in a plastic jacket is. table or only with acceptance of a sister

3. A compound according to any one of claims 1 chung of the jacket is possible.

and 2, characterized in that there is 20 in the German utility model 1 908 046 when present Being a second coat called the space between, nor the possibility of a better gift the two sheaths with the cable core division of the tensile forces on all cores on the ones on the Kavornehmlich by a U-shaped bent both anchored shank of a pull-eye anchor the Tube is connected. Solder wires. However, this method works if all

25 veins are captured, to a bead-like thickening of the drawing-in end and is at a larger one

Number of wires very complex. In addition, however,

due to the more or less disordered distribution of the veins, an even distribution

The invention relates to a tensile and pressurized gas 30 which does not guarantee tensile forces on this,

tight connection between the end of a cable For cables with a plastic sheath, is at

and a pulling head, which is used to make a cable using cast resin caps a permanent

by means of a pull rope in channels or pipelines pressure gas tightness of the cable is not ensured, because

to relocate. The known casting resins on plastics do not or do not occur on the cable

the tensile forces must not adhere to any mechanical deforma- 35 only imperfectly. In addition, casting

cause damage to the cable, since even such resins are sensitive to impacts and bumps. One could now

which are not immediately recognizable, changes z. B. around the whole cast resin finish again

A plastic jacket can appear in the electrical data of the cable. That would give you

nen. It is not uncommon for cables to be adequately pressurized under internal pressure, however

transported and drawn in. After the laying, the creation of such a connection will be very important

The internal pressure that still exists is, among other things, expensive.

a sign that the cable is being laid. The object of the invention is to provide a

was not damaged. Tensile and pressurized gas-tight connection between

It is known to use pull grips, a cable provided with a plastic sheath

which are pulled over the cable jacket. The 45 and a pulling head indicate which one is essential

In this case, the jacket takes over the entire mechanical

cic stress when pulling the cable. Such fertilize.

Pulling stockings can therefore only be mechanically fe- According to the invention, the wire ends are in stem sheaths, eg. B. lead jackets, aluminum jackets, a steel cup firmly connected to the drawbar eye or steel reinforcement can be used. 50 is soldered in, and the steel cup and the end of the Ka-But already with cables with corrugated jackets, belmantels are tightly encapsulated with plastic, whereby, due to the elasticity of the jacket, such pulling between the steel cup and the plastic stockings can no longer be used if irreversible injection occurs Adhesion promoter, in particular a co-changes to the cable by the drawing process polymer layer, is introduced.
should be avoided. When pulling in such cables 55 The copolymer layer can come from the solution or in channels, so the wires of the cable must be applied to the steel cup from the melt,
take over a substantial part of the tensile forces that occur. For this purpose, the space between the two sheaths is freed with lation in the case of a wire provided with two sheaths over a length of about 100 mm from the insulation cable and the lower free half upwards 60 of the cable core primarily through a Bent into a U-shape. A curved tube is connected from below via the veins.
Steel cup filled with cast resin, the inner diameter of which is greater than the outer diameter of the stripping and pre-tinning of the wire ends is advantageously done by immersing the cable sheath and to which the pulling eye is attached in a liquid tin bath,
is brought, pushed. In this case, the casting resin surrounds 65. It has been shown that it is sufficient if the wires are the wires exposed from the insulation and only a few millimeters into the end of the jacket that exerts the tensile force. After the resin has solidified, immerse the hardened solder bath. So it is not necessary to ensure the tensile strength is essentially guaranteed, the wire ends over a longer distance