JP2557979Y2 - Connection of metal tube with plastic-coated filament - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting portion of a metal tube containing a plastic-coated filament having high strength.

[0002]

2. Description of the Related Art A metal tube with a plastic-coated filament is
Plastic-coated wires such as plastic-coated metal core wires or plastic-coated optical fiber core wires are used for SUS, iron,
It is housed in a metal tube such as Al. Then, the metal pipe with the plastic-coated wire is wound around the fluid transport pipe or the power cable together with the armoring wire to simultaneously perform fluid transport and power transmission and signal transmission such as control of communication control equipment. Used. By the way, this kind of connection of a metal pipe with a plastic-coated wire is performed by connecting the inner wire and then welding or cold-welding the outer metal pipes or bolting a flange provided at the end of the metal pipe. It was done by a method such as tightening. However, all of the above connection methods are insufficient in strength against tension and torsion applied during laying. In addition, the welding method has a problem in that the plastic-coated filament is thermally damaged, and the flange method does not provide the required airtightness.

[0003] Under such circumstances, a sleeve type connecting portion has been developed (see Japanese Utility Model Laid-Open No. 3-96605). As shown in the longitudinal sectional view of FIG. 3, the sleeve-type connecting portion includes two metal tubes 3 with plastic-coated filaments formed by inserting a plastic-coated filament 2 into a metal tube main body 1. of,
The plastic-coated filaments 2 are connected to each other,
The connection sleeve 4 is put over the end of the metal pipe main body 1 so as to straddle it, the connection sleeve 4 is crimped to a predetermined position of each of the two metal pipe main bodies 1 and crimped. Was welded hermetically to the metal tube main body 1, and the connection sleeve 4 was further covered with a heat-shrinkable tube 8. 5 is a crimp connection, 6 is a weld, and 7 is a plastic-coated wire connection.

[0004]

However, the above-mentioned sleeve-type connecting portion is thicker than the other portion by covering the sleeve with the other portion, so that the connecting portion is manufactured, transported or laid on the sea floor. Sometimes it rubs against the floor, the ground, or the sea floor, and the connection is exposed to more external force than the other parts, resulting in damage to the weld, impairing the airtightness of the inside, and the penetration of seawater into the metal pipe. There was a problem.

[0005]

SUMMARY OF THE INVENTION The present invention provides a connecting portion for a metal tube containing a plastic-coated filament, which solves the above-mentioned problem, and in which a metal tube containing a plastic-coated filament is connected to each other. Wherein the plastic-coated filaments are connected to each other, the metal pipes are interconnected via a connection sleeve, and both ends of the connection sleeve are welded to the metal pipe. In a first aspect of the present invention, a stopper sleeve is provided at both ends in the axial direction of the connection sleeve at the connection portion of the pipe via a protection portion. In the invention, an outer diameter of an end of the stopper sleeve opposite to the connection sleeve is provided. Is a second invention that the diameter is gradually reduced toward the end. Here, the protection portion means a portion where a gap formed between the metal tube, the connection sleeve, and the stopper sleeve is filled with a protection material made of plastic, FRP, rubber, or the like.

[0006]

As described above, when the stopper is provided on both sides of the connection sleeve in the axial direction via the protection portions to constitute the connection portion, the stress applied to the welded portion between the connection sleeve and the metal pipe main body is reduced in the radial direction. Is relaxed by the protection portion, and in the longitudinal direction, is relaxed by the stopper sleeve, so that the strength of the connection portion is improved. In addition, since the protection portion has a water barrier, the waterproofness of the connection portion is also improved. Further, since there is no unevenness between the stopper sleeves on both sides of the connecting portion, the external force applied to the connecting portion by the operation is reduced. Furthermore, the outer diameter of the end of the stopper sleeve opposite to the connection sleeve is
When the diameter is gradually reduced in the end direction, the stress applied to the metal pipe at that portion can be reduced in the longitudinal direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view showing one embodiment of the connecting portion of the present invention. The reference numerals in the drawing are the same as those in FIG. 3 used for the description of the related art. In the present embodiment, the metal tube 3 with a plastic-coated wire is used to replace the plastic-coated wire 2 such as a plastic-coated optical fiber core or a plastic-coated metal core with a metal tube body 1 made of stainless steel, iron or aluminum. It is configured to be housed inside. The connection between the two metal tubes 3 with plastic-coated filaments is performed via a connection sleeve 4. At both ends of the connection sleeve 4, the connection sleeve 4 and the metal tube main body 1 are connected to a plurality of crimp connection portions 5. Are connected mechanically. Further, the metal pipe main body 1 and the connection sleeve 4
Is hermetically sealed by welding the connection sleeve 4 end and the metal pipe main body 1 to form a welded portion 6. Further, the stopper sleeve 1 is placed on the metal pipe main body 1 adjacent to the welded portion 6.
Caulking 0 and fixing by welding or the like. Metal tube body 1,
A gap provided by the connection sleeve 4 and the stopper sleeve 10 is filled with a protective material such as plastic, FRP, rubber, or a protective tape or the like in accordance with the side surfaces of the connection sleeve 4 and the stopper sleeve 10.
Form one. Thereby, the waterproofness of the welded portion 6 is improved, and the unevenness between the connection sleeve 4 and the stopper sleeve 10 is eliminated, so that the risk of damage to the connection portion is reduced.

On the outer periphery of the connecting portion constructed in this manner, the portion between the end of the connecting sleeve 4 and the metal pipe main body 1 or the connecting sleeve One or more protective tapes are wound around the outer periphery of the connection sleeve 4 so as to cover the whole of the metal tube main body 1 from one side to the other so as to cover the entirety, and the protective tape layer 9 is provided. Further, a heat-shrinkable tube 8 is put on the outer periphery of the protective tape layer 9 so as to cover the entire connecting portion from one side of the metal pipe main body 1 to the other.

There are various methods for attaching the stopper sleeve 10 to the metal tube main body 1. For example, FIG.
(C) is a sectional view of a state in which the stopper sleeve 10 is mounted on the metal pipe main body 1. In FIG. 2A, the stopper sleeve 10 has a cylindrical shape, and is welded to the metal pipe main body 1 at an end opposite to the protective portion 11, and has an outer diameter that is gently inclined from the end of the stopper sleeve 10. Is formed, the welded portion 6a gradually becoming smaller. In this case, if the stopper sleeve 10 is fixed to the metal pipe main body 1 by pressure bonding,
The fixing of the stopper sleeve 10 to the metal tube main body 1 is further ensured. In FIG. 2B, the stopper sleeve 1 is used.
Numeral 0 has a gentle slope from the end opposite to the protection portion 11, and its outer diameter is gradually reduced, and is fixed to the metal tube main body 1 by pressure bonding. In this case, the end of the stopper sleeve 10 on the protection section 11 side may be welded. Further, FIG.
The stopper sleeve 10 has its entire outer diameter gradually reduced from the protection portion 11 side, and is fixed to the metal tube main body 1 by pressure bonding. In this case, the end of the stopper sleeve 10 on the protection section 11 side may be welded.

[0010]

As described above, according to the present invention, a connecting portion for interconnecting metal pipes containing plastic-coated filaments, wherein the plastic-coated filaments are connected to each other, and the metal pipe is connected to a connection sleeve. At both ends of the connection sleeve in the axial direction of the connection sleeve at the connection portion of the metal tube containing the plastic-coated linear body, wherein both ends of the connection sleeve are welded to the metal tube. Is provided, the stress applied to the welded portion between the connection sleeve and the metal pipe main body is reduced, and further, there is an excellent effect that the external force applied to the connection portion by the operation is reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a connection portion of a metal tube containing a plastic-coated filament according to the present invention.

FIGS. 2A to 2C are longitudinal sectional views showing a state in which a stopper sleeve is mounted on a metal tube main body.

FIG. 3 is a longitudinal sectional view of a connection portion of a conventional metal tube containing a plastic-coated filament.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal pipe main body 2 Plastic-coated linear body 3 Metal pipe with plastic-coated linear body 4 Connection sleeve 5 Crimp connection part 6, 6a Welding part 7 Plastic-coated linear body connection part 8 Heat-shrinkable tube 9 Protective tape layer 10 Stopper sleeve 11 Protector

Claims (2)

(57) [Scope of request for utility model registration] 1. A connecting portion for interconnecting metal tubes containing plastic-coated filaments, wherein the plastic-coated filaments are connected to each other, and the metal tubes are mutually coupled via a connection sleeve. In the plastic tube, the stopper is provided on both sides of the connection sleeve in the axial direction at the connection portion of the metal tube containing the plastic-coated linear body by welding both ends of the connection sleeve to the metal tube. Connection part of the metal tube containing the coated filament. 2. The metal tube with a plastic-coated wire according to claim 1, wherein the outer diameter of the end of the stopper sleeve opposite to the connection sleeve is gradually reduced in the end direction. Connection.