JPH09259650A - Submarine cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submarine cable for which an overcoating having viscosity is no need to be formed on a serving layer surface. SOLUTION: A linear sheath body 3 is formed in the outer circumference of a cable main body 1 and a serving layer 5 is formed in the outer circumference of the linear sheath body 3. The serving layer 5 comprises a rolled body of distinguishing wires and a plurality of assembled and twisted wires 8 impregnated with a varnish easy to be dried. The assemble and stranded wires 8 impregnated with varnish easy to be dried are produced by impregnating assembled and twisted wires comprising assembled and stranded bodies of a plurality of synthetic resin stranded threads with varnish easy to dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine cable laid on the bottom of a sea such as a seabed, a riverbed or a lake.

[0002]

2. Description of the Related Art FIG. 4 shows the structure of a conventional submarine cable. The submarine cable is provided with a wire armor body 3 made of a wound body such as a galvanized iron wire on the outer periphery of a cable body 1 such as a power cable body through a seat 2, and a coating applied to the wire armor body 3 4 is provided, a serving layer 5 is provided on the outer periphery thereof, and the coating material 6 is applied to the serving layer 5 for reinforcement.

At the beginning of the development of a water-bottomed cable, the seat 2 and the serving layer 5 were made of jute twisted yarn, and a black asphalt compound was used as the hanging paint 6.

Since then, due to the poor pattern of jute and corrosion during use, the seat 2 and the serving layer 5 have been formed of polypropylene twisted yarn since about 1981. The polypropylene twisted yarn is obtained by forming a polypropylene film into a string shape and twisting a plurality of these. As the coating material 6, white atactic polypropylene has been used.

However, atactic polypropylene has a water absorbing property and is used as a water absorbing agent (paper diaper).
However, there is a problem that the adhesive strength is insufficient due to the off-grading, and as a result, the application paint 6 is 1987.
It has been returned to the black asphalt compound since around 1945.

[0006]

However, in the conventional submarine cable, in order to protect the polypropylene twisted yarn constituting the serving layer 5 from external forces such as rubbing, a coating material 6 made of a black asphalt compound is applied. Therefore, there is a problem that the manufacturing equipment is easily soiled during manufacturing due to the stickiness of the asphalt-based compound. Further, during the laying, there is a problem that the laying roller is easily soiled and the laying roller 6 is easily worn because the viscosity of the coating material 6 is high.

Further, when the serving layer 5 is coated with the black asphalt-based compounding paint 6, it is difficult to provide the length mark and the phase identifier, and even when the length mark and the phase identifier are provided, the applying paint 6 is provided. There were problems such as being dirty and unreadable and polluting the environment.

It is an object of the present invention to provide a submarine cable which does not require a viscous coating material to be applied to the surface of the serving layer.

Another object of the present invention is to provide a submarine cable in which a phase identifying member can be easily provided on a serving layer.

[0010]

DISCLOSURE OF THE INVENTION The present invention is to improve a submarine cable having a structure in which a wire armor body is provided on the outer periphery of a cable body, and a serving layer is provided on the outer periphery of the wire armor body. is there.

In the submarine cable according to claim 1, the serving layer is composed of a wound body of a plurality of dry varnish-impregnated aggregate twisted wires, and the dry varnish-impregnated aggregate twisted wires include a plurality of synthetic resin twisted yarns. It has a structure in which a dry varnish is impregnated into a gathered stranded wire made of the above twisted body.

Thus, the serving layer is composed of a wound body of a plurality of dry varnish-impregnated aggregate twisted wires, and the dry varnish-impregnated aggregate twisted wire is an aggregate consisting of an aggregate twisted body of a plurality of synthetic resin twisted yarns. When the twisted wire has a structure in which the dry varnish is impregnated, the dry varnish-impregnated aggregate twisted wire itself has sufficient mechanical strength, and thus the wound body of the dry varnish-impregnated aggregate twisted wire is provided. Since it is not necessary to apply viscous hanging paint to the above, it is possible to solve the problem due to stickiness of the viscous hanging paint.

Further, since the surface of the wound body of the dry varnish-impregnated aggregate twisted wire is in a dry state, it is possible to easily form the length mark, and the length mark can be read with a coating material. There is no problem of disappearing, and there is no problem of soiling or abrading the laying roller.

Furthermore, when the dry varnish-impregnated aggregate twisted wire is a structure in which the dry varnish is impregnated into the aggregate twisted wire composed of the aggregate twisted body of a plurality of synthetic resin twisted yarns, the outer periphery of the wire armored body is In comparison with the case where the serving layer is provided by impregnating the serving layer by passing it through the liquid of the drying varnish and then drying, the amount of the drying varnish impregnated is small, and it can be immediately dried by hot air drying in a short time. There is an advantage that it can be dried, and impregnation and drying of the drying varnish can be performed at low cost and in a short time without polluting the equipment.

In the submarine cable according to the present invention, the serving layer is composed of a wound body of an identification wire and a plurality of dry varnish-impregnated aggregate twisted wires, and the plurality of dry varnish-impregnated aggregate twisted wires are provided. The synthetic stranded wire made of the aggregated twisted body of the synthetic resin twisted yarn of 1 is impregnated with a drying varnish.

In this way, the serving layer is composed of a wound body of a plurality of dry varnish-impregnated aggregate twisted wires, and the dry varnish-impregnated aggregate twisted wire is an aggregate consisting of an aggregate twisted body of a plurality of synthetic resin twisted yarns. When the twisted wire has a structure in which the dry varnish is impregnated, the dry varnish-impregnated aggregate twisted wire itself has sufficient mechanical strength, and thus the wound body of the dry varnish-impregnated aggregate twisted wire is provided. Since it is not necessary to apply viscous hanging paint to the above, it is possible to solve the problem due to stickiness of the viscous hanging paint.

Further, since the surface of the wound body of the dry varnish-impregnated aggregate twisted wire is in a dry state, it is possible to easily form the length mark, and the length mark can be read with a coating material. There is no problem of disappearing, and there is no problem of soiling or abrading the laying roller.

Further, if the winding of the dry varnish-impregnated aggregate twisted wire has an identification wire, the identification wire can easily identify the phase of the cable, and the identification wire is applied to the coating material. It also eliminates the problem of becoming unreadable.

[0019]

1 to 3 show an example of an embodiment of a submarine cable according to the present invention.

As shown in FIGS. 1 and 2, the submarine cable of this example is a wire armor consisting of a wound body such as a galvanized iron wire on the outer periphery of a cable body 1 such as a power cable body with a seat 2 interposed therebetween. A body 3 is provided, a coating material 4 is applied to the wire armor body 3, and a serving layer 5 is provided on the outer periphery thereof. The seat 2 is made of polypropylene twisted yarn. The serving layer 5 is composed of a spiral wound body of an identification wire 7 and a plurality of dry varnish-impregnated aggregate twisted wires 8. As shown in FIG. 3, the dry varnish-impregnated collective twisted wire 8 has a structure in which a dry varnish is impregnated into a collective twisted wire 8 ′ made of a collective twisted body of a plurality of synthetic resin twisted yarns 9. As the drying varnish, for example, a mixture of one or both of a synthetic resin and a drying oil and a volatile oil can be used. Specific examples of the drying varnish include a mixture of polyester resin and solvent naphtha, a mixture of epoxy resin and xylol, a mixture of phenol resin, drying oil and solvent naphtha, and the like. As the identification wire 7, for example, a dried varnish-impregnated aggregate twisted wire 8 is used, and one or a plurality of such wires are adjoined to each other. It can be provided as a spiral mark by spirally winding it around the outer periphery of the wire armor body 3. The coating material 4 needs to be applied in a small amount so as not to exude from the serving layer 5. The hanging paint 5 may be omitted depending on the material of the wire armor body 3.

In this case, as a method of impregnating the gathered twisted wire 8'with a dry varnish, a method of impregnating the synthetic resin twisted yarn 9 before the gathering and twisting with each other, a method of impregnating the synthetic resin twisted yarn 9 at the time of gathering and the gathering, There is a method of impregnating the stranded wire 8'after it is formed, and any method may be adopted. In all of these three methods, a thin varnish is impregnated with a drying varnish at atmospheric pressure, so that the cable body 1
Unlike the one in which the assembled stranded wire 8'is wound around and then impregnated and dried at normal pressure, the amount of impregnated dry varnish is small, and it can be dried immediately in a short time by hot air drying etc. Impregnation and drying can be carried out without using it.

In this way, the serving layer 5 is composed of a wound body of a plurality of dry varnish-impregnated aggregate twisted wires 8, and the dry varnish-impregnated aggregate twisted wires 8 are aggregated and twisted of a plurality of synthetic resin twisted yarns 9. When the assembled stranded wire 8'comprising a body is impregnated with a dry varnish, the dry varnish-impregnated assembled stranded wire 8 itself has sufficient mechanical strength. It is not necessary to apply viscous hanging paint to the wound body of the gathered twisted wire 8, and the problem due to stickiness of the viscous hanging paint can be solved.

Also, this dry varnish-impregnated aggregate stranded wire 8
Since the surface of the wound body is dry, the length marks can be easily formed, and there is no problem that the length marks will be illegible with the paint, and the laying roller will be soiled and worn. There is no problem with it. As the length mark, a tape with a length indication is wound around a predetermined position in the longitudinal direction of the wound body of the dry varnish-impregnated aggregate twisted wire 8 or a tag with a length indication is attached to the dry varnish-impregnated aggregate twisted wire 8. And the like.

Further, if the winding wire of the dry varnish-impregnated aggregate twisted wire 8 includes the identification wire 7, the identification wire 7 can easily identify the phase of the cable, and the identification wire 7 There is also no problem that 7 becomes unreadable with paint.

[0025]

In the submarine cable according to the first aspect of the invention, the serving layer is composed of a wound body of a plurality of dry varnish-impregnated aggregate twisted wires, and the dry varnish-impregnated aggregate twisted wires are composed of a plurality of composites. Since the structure has a structure in which a dry varnish is impregnated in a collective twisted wire made of a collective twisted body of resin twisted yarns, the dry varnish impregnated collective twisted wire itself has sufficient mechanical strength. Since it is not necessary to apply a viscous coating material to the wound body of the impregnated aggregate twisted wire, various problems due to stickiness of the viscous coating material can be solved.

Since the surface of the wound body of the dry twisted varnish-impregnated aggregate stranded wire is in a dry state, the length mark can be easily formed, and the length mark can be read with a coating material. There is an advantage that there is no problem of disappearing and there is no problem of soiling or abrading the laying roller.

Further, when the dry varnish-impregnated collective twisted wire is a structure in which the dry twisted varnish is impregnated in the collective twisted wire made of a collective twisted body of a plurality of synthetic resin twisted yarns, the outer periphery of the wire armored body is In comparison with the case where the serving layer is provided by impregnating the serving layer by passing it through the liquid of the drying varnish and then drying, the amount of the drying varnish impregnated is small, and it can be immediately dried by hot air drying in a short time. There is an advantage that it can be dried, and impregnation and drying of the drying varnish can be performed at low cost and in a short time without polluting the equipment.

In the submarine cable according to the second aspect of the present invention, in particular, since the serving layer is composed of a wound body of the identification wire and a plurality of dry varnish-impregnated aggregate twisted wires,
This identification line has an advantage that the phase of the cable can be easily identified, and the use of the dry varnish-impregnated assembled twisted wire does not cause a problem that the identification line cannot be read by the paint.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment of a submarine cable according to the present invention.

2 is a side view of the submarine cable shown in FIG. 1. FIG.

FIG. 3 is an enlarged cross-sectional view showing a state before the dry varnish impregnation of the dry varnish-impregnated aggregate twisted wire used in FIG. 1.

FIG. 4 is a cross-sectional view of a conventional submarine cable.

[Explanation of symbols]

1 Cable Main Body 2 Seat Floor 3 Wire Armor Body 4 Hanging Paint 5 Serving Layer 6 Hanging Paint 7 Identification Line 8 Drying Varnish Impregnated Twisted Wire 8'Aggregated Twisted Wire consisting of multiple twisted synthetic resin twisted yarns

Claims (2)

[Claims] 1. A submarine cable in which a wire armor body is provided on the outer circumference of a cable body, and a serving layer is provided on the outer circumference of the wire armor body, wherein the serving layer is a plurality of dry varnish-impregnated aggregate strands. The dry varnish-impregnated aggregate twisted wire is constituted by a wound body of wire, and the dry twisted varnish is impregnated into the aggregate twisted wire composed of an aggregate twisted body of a plurality of synthetic resin twisted yarns. Underwater cable to be. 2. A submarine cable in which a wire armor body is provided on the outer circumference of a cable body, and a serving layer is provided on the outer circumference of the wire armor body, wherein the serving layer is an identification line and a plurality of dry varnishes. The dry varnish-impregnated aggregate twisted wire is composed of a wound body with an impregnated aggregate twisted wire, and the dry twisted varnish is impregnated into the aggregate twisted wire composed of an aggregate twisted body of a plurality of synthetic resin twisted yarns. A submarine cable characterized by being