JP2599465Y2 - 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 connection portion of a metal pipe containing a plastic-coated linear body having excellent airtightness.

[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. And this metal pipe with a plastic-coated filament is wound around the outside of the water supply pipe and the power cable with the outer wire, and the water supply and the power transmission,
It is used as an optical composite submarine long body that can control the control equipment at the same time. By the way, this type of metal pipe with a plastic-coated filament is connected by connecting the inner filaments 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 with respect to 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 (Japanese Utility Model Laid-Open No. 3-96605). As shown in the longitudinal sectional view of FIG. 2, the sleeve-type connecting portion connects the plastic-coated filaments 1 of the two metal tubes 2 containing the plastic-coated filaments 1 to each other, and forms Two metal tubes 2
Put the sleeve 3 over the end and cover the sleeve 3
Each of the metal tubes 2 is caulked and pressed at a predetermined position, the end of the sleeve 3 is air-tightly welded to the metal tube 2, and a heat-shrinkable tube 6 is further coated on the sleeve 3. there were.

[0004]

However, the above-mentioned sleeve-type connecting portion is thicker than the other portion by covering the sleeve with the sleeve, 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 with a plastic-coated filament, which solves the above-mentioned problem. The pipes are connected with each other by connecting the plastic-coated filaments to each other, two metal pipes on the outer circumference thereof are connected by covering with a sleeve, and the sleeve is caulked to a predetermined position of each of the two metal pipes and crimped. At the connection portion of the metal tube containing the plastic-coated linear body in which both ends of the sleeve are hermetically welded to the metal tube, a self-fusing protection tape and a sub-elasticity protection tape are provided on the sleeve including the periphery of the hermetic welding portion. The present invention is characterized in that the superposed double tape is wound, and a heat-shrinkable tube is further provided thereon.

In the present invention, the reason why the double tape of the self-fusing protective tape and the sub-elastic protective tape is wound is as follows.
By tightening up the windings of the self-bonding protective tape Annan stretchable protective tape, and self-bonding is assistance, waterproof effect is to more reliably realized. The double protective tape is wound tightly so as to completely cover the periphery of the hermetically welded portion between the sleeve and the metal tube. The number of turns is arbitrary such as single, double or multiple depending on the application. In the case of single winding, it is preferable to particularly thickly wind around the welded portion. If a heat-shrinkable tube is further placed on the wound body of the double protective tape, the reinforcing and waterproofing effect is improved. As the self-fusing protective tape, a tape material containing butyl rubber, isobutylene or the like as a main component is used. A tape material mainly composed of polyethylene, polypropylene, or the like is used as the sub-elasticity-resistant protective tape. By covering the heat-shrinkable tube on the double protective tape, the connection portion can be further strengthened and waterproofed. The self-bonding protective tape and Annan stretchable protective tape and the double tape of repeating the winding operation is carried out efficiently.

[0007]

The connecting portion of the metal tube with the plastic-coated filament of the present invention is connected to the plastic-coated filament inside.
The sleeve is straddled over the end of the metal pipe of the book, the metal pipe and the sleeve are caulked and integrated, and both ends of the sleeve are hermetically welded to the metal pipe, and then on the sleeve including the vicinity of the hermetic weld. sequentially tightly wound the double tape comprising a self-adhesive protective tape and Annan stretchable protective tape, on which
Since the heat-shrinkable tube is provided to reinforce the hermetic weld, damage to the hermetic weld due to external stress is prevented. Also, even if the hermetic weld is damaged, the outer periphery of the hermetic weld is self-fusing protection tape and sub-elasticity protection tape,
Furthermore, since the upper part is covered with the heat-shrinkable tube, airtightness is maintained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Embodiment 1 FIGS. 1A and 1B are longitudinal sectional views showing an embodiment of a connecting portion of the present invention. The connecting part shown in FIG. 1A is a SUS metal tube (outer diameter 8 mm) containing two plastic-coated optical fibers 1.
φ, inner diameter 3 mmφ) A predetermined length of the metal tube 2 at the end of the metal tube 2 is cut and removed, and the plastic-coated optical fiber core 1 inside the metal tube 2 is cut off.
Are exposed, the exposed plastic-coated optical fibers 1 are connected to each other, and then the ends of the two metal tubes 2 are covered with sleeves 3. The sleeves 3 are attached to predetermined positions of the two metal tubes 2 respectively. Shimete crimped, and hermetically welding the sleeve 3 and the metal pipe 2 at both ends of the sleeve 3, further on the sleeve 3, including the periphery of the hermetic weld 4, the self-bonding protective tape 5 made of butyl rubber A connection tape was formed by winding a protection tape in which a sub-elastic protection tape 6 made of polyethylene was double-layered, and a heat-shrinkable tube 7 was further placed thereon.

[0009]

As described above, the connection portion of the metal pipe with the plastic-coated filament of the present invention is formed by the self-fusing protection tape and the sub-elasticity protection tape between the sleeve of the connection portion and the vicinity of the hermetically welded portion. Wraps a double layer of protective tape, and over it
Since it is reinforced by providing a heat-shrinkable tube, airtightness is maintained even when an external force is applied, and accidents such as water infiltration are prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a connecting portion of a metal tube containing a plastic-coated filament of the present invention.

FIG. 2 is a longitudinal sectional view of a connection portion of a conventional metal tube with a plastic-coated filament.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plastic-coated striated body 2 metal tube 3 sleeve 4 airtight welded part 5 self-fusing protective tape 6 sub-elasticity-resistant protective tape 7 heat-shrinkable tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02B 6/24 H02G 15/08 H02G 15/18

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal tube containing two plastic-coated filaments, wherein the plastic-coated filaments are connected to each other, two metal pipes on the outer periphery thereof are connected with a sleeve, and the two sleeves are connected. At the connection portion of the metal tube containing the plastic-coated filament, both ends of the sleeve are hermetically welded to the metal tube by caulking and crimping each of the predetermined portions of the metal tube,
A double tape in which a self-fusing protection tape and a sub-elasticity protection tape are superimposed on a sleeve including the periphery of the hermetic weld.
And a heat-shrinkable tube is further provided on the heat-shrinkable tube .