JP6288364B1 - Cable connection structure and method of manufacturing cable connection structure - Google Patents

Abstract

Even when a difference in axial force occurs between a pair of power cables, the pair of power cables, a rubber connecting tube, and a protective tube are prevented from being relatively displaced in the axial direction of the power cable. Provide technology that can. A pair of power cables, each having a conductor at the center and being abutted with each other with their conductor axes aligned, a conductor connection tube for compressively connecting the conductors of the pair of power cables, and a conductor connection tube, A rubber connection tube fitted around the pair of power cables so as to cover each part of the pair of power cables, a protection tube provided so as to cover each part of the rubber connection tube and the pair of power cables, Linking and fixing for connecting and fixing at least one of a pair of power cables and the protective tube on the inner side of the protective tube and on the outer side of the rubber connecting tube in the axial direction, between the filler filled between the rubber connecting tube and the protective tube Part. [Selection] Figure 1

Description

  The present invention relates to a cable connection structure and a method for manufacturing the cable connection structure.

  A cable connection structure that connects a pair of power cables with the axes of the conductors aligned with each other may be provided (for example, Patent Document 1).

  When such a cable connection structure is installed in a manhole, the offset portion is formed by bending the power cable in an S shape on each of both sides of the cable connection structure. Thereby, the thermal expansion and contraction of the power cable can be absorbed by the offset portion.

JP 2003-18738 A

  Here, if each of the pair of power cables is laid in a straight line from the pipeline to the manhole, and the shape of the offset portion is equal on both sides of the cable connection structure, the axial direction of the power cable due to thermal expansion and contraction of the power cable Stress (hereinafter referred to as axial force) can be canceled out on both sides of the cable connection structure.

  However, if only one of the pair of power cables is bent and laid from the conduit toward the manhole, or if the shape of the offset portion is different on both sides of the cable connection structure, both sides of the cable connection structure Thus, there is a possibility that an axial force difference is generated between the pair of power cables.

  An object of the present invention is that even when an axial force difference is generated between a pair of power cables, the pair of power cables, the rubber connecting cylinder, and the protective tube are relatively displaced in the axial direction of the power cable. It is providing the technique which can suppress.

According to one aspect of the invention,
A pair of power cables, each having a conductor in the center, and abutting each other with the axes of the conductors aligned,
A conductor connection tube for compressively connecting the conductors of the pair of power cables;
A rubber connection tube fitted on the conductor connection tube and the pair of power cables so as to cover a part of each of the pair of power cables;
A protective tube provided to cover a part of each of the rubber connection cylinder and the pair of power cables;
A filler filled between the rubber connecting tube and the protective tube;
A connecting and fixing portion for connecting and fixing at least one of the pair of power cables and the protecting tube on the inside of the protecting tube and on the outside of the rubber connecting cylinder in the axial direction;
A cable connection structure is provided.

According to another aspect of the invention,
A first power cable and a second power cable each having a conductor in the center;
A conductor at the center, interposed between the first power cable and the second power cable, with the axes of the conductors aligned with each of the first power cable and the second power cable; An interrupt cable to be matched,
A first conductor connecting pipe that compressively connects the conductors of the first power cable and the interrupt cable;
A first rubber connection tube fitted over the first conductor connection pipe, a part of the first power cable, and a part of the interrupt cable;
A second conductor connecting pipe for compressively connecting the conductors of the second power cable and the interrupt cable;
A second rubber connection tube fitted over the second conductor connection pipe, a part of the second power cable and a part of the interrupt cable,
A protective tube provided to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
A filler filled between the first rubber connection tube and the second rubber connection tube and the protective tube;
Connecting at least one of the first power cable and the second power cable and the protection tube inside the protection tube and outside in the axial direction of the first rubber connection tube and the second rubber connection tube A connecting fixing part to be fixed;
A cable connection structure is provided.

According to yet another aspect of the invention,
A first power cable and a second power cable each having a conductor in the center;
A conductor at the center, interposed between the first power cable and the second power cable, with the axes of the conductors aligned with each of the first power cable and the second power cable; An interrupt cable to be matched,
A first conductor connecting pipe that compressively connects the conductors of the first power cable and the interrupt cable;
A first rubber connection tube fitted around the first conductor connection pipe, a part of the first power cable, and a part of the interrupt cable;
A second conductor connecting pipe for compressively connecting the conductors of the second power cable and the interrupt cable;
A second rubber connection tube fitted over the second conductor connection pipe, a part of the second power cable and a part of the interrupt cable,
A protective tube provided to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
A filler filled between the first rubber connection tube and the second rubber connection tube and the protective tube;
A connecting and fixing portion for connecting and fixing the insertion cable and the protecting tube on the inner side of the protecting tube and on the outer side in the axial direction of the first rubber connecting tube and the second rubber connecting tube;
A cable connection structure is provided.

According to yet another aspect of the invention,
A pair of power cables each having a conductor in the center, with the axes of the conductors matching each other,
A step of compressively connecting the conductors of the pair of power cables with a conductor connecting pipe;
A step of externally fitting a rubber connection tube so as to cover a part of each of the conductor connection tube and the pair of power cables;
Providing a protective tube so as to cover a part of each of the rubber connecting cylinder and the pair of power cables;
Filling a filler between the rubber connecting tube and the protective tube;
Have
In the step of providing the protective tube,
Provided is a cable connection structure manufacturing method in which at least one of the pair of power cables and the protection tube are connected and fixed by a connection fixing portion inside the protection tube and outside the rubber connecting cylinder in the axial direction. .

According to yet another aspect of the invention,
Preparing a first power cable, a second power cable and an interrupt cable each having a conductor in the center;
The interrupt cable is interposed between the first power cable and the second power cable, and each of the first power cable and the second power cable and the interrupt cable are arranged on the axis of the conductor. Matching and matching,
Compressing and connecting the conductors of the first power cable and the interrupt cable with a first conductor connecting pipe;
Compressing and connecting the conductors of the second power cable and the interruption cable with a second conductor connecting pipe;
A step of externally fitting a first rubber connection tube so as to cover the first conductor connection tube, a part of the first power cable, and a part of the interruption cable;
A step of externally fitting a second rubber connection tube so as to cover the second conductor connection pipe, a part of the second power cable and a part of the interruption cable;
Providing a protective tube so as to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
Filling a filler between the first rubber connection tube and the second rubber connection tube and the protective tube;
In the step of providing the protective tube,
Connecting at least one of the first power cable and the second power cable and the protection tube inside the protection tube and outside in the axial direction of the first rubber connection tube and the second rubber connection tube A method of manufacturing a cable connection structure that is connected and fixed by a fixing portion is provided.

According to yet another aspect of the invention,
Preparing a first power cable, a second power cable and an interrupt cable each having a conductor in the center;
The interrupt cable is interposed between the first power cable and the second power cable, and each of the first power cable and the second power cable and the interrupt cable are arranged on the axis of the conductor. Matching and matching,
Compressing and connecting the conductors of the first power cable and the interrupt cable with a first conductor connecting pipe;
Compressing and connecting the conductors of the second power cable and the interruption cable with a second conductor connecting pipe;
A step of externally fitting a first rubber connection tube so as to cover the first conductor connection tube, a part of the first power cable, and a part of the interruption cable;
A step of externally fitting a second rubber connection tube so as to cover the second conductor connection pipe, a part of the second power cable and a part of the interruption cable;
Providing a protective tube so as to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
Filling a filler between the first rubber connection tube and the second rubber connection tube and the protective tube;
In the step of providing the protective tube,
A manufacturing method of a cable connection structure in which the interrupt cable and the protective tube are connected and fixed by a connecting and fixing portion inside the protective tube and outside in the axial direction of the first rubber connecting tube and the second rubber connecting tube. Is provided.

  According to the present invention, even when an axial force difference is generated between the pair of power cables, the pair of power cables, the rubber connecting cylinder, and the protective tube are relatively displaced in the axial direction of the power cable. Can be suppressed.

It is the front view and sectional drawing which show the cable connection structure which concerns on 1st Embodiment of this invention. (A) is sectional drawing of the axial direction of an electric power cable which expanded the connection fixing | fixed part, (b) is A-A 'sectional view taken on the line of (a). It is sectional drawing which shows the cable connection structure which concerns on the modification 1 of 1st Embodiment of this invention. It is sectional drawing to which the clamp which concerns on the modification 2 of 1st Embodiment of this invention was expanded. (A) is sectional drawing which shows the cable connection structure which concerns on 2nd Embodiment of this invention, (b) is sectional drawing which shows the cable connection structure which concerns on the modification 1 of 2nd Embodiment of this invention. is there. (A) is sectional drawing which shows the cable connection structure which concerns on the modification 2 of 2nd Embodiment, (b) is sectional drawing which shows the cable connection structure which concerns on the modification 3 of 2nd Embodiment.

<Knowledge obtained by the inventors>
First, knowledge obtained by the inventors will be described.

  As the above-mentioned cable connection structure, there are, for example, two types: a conventional prefabricated type and a type using a cold-shrinkable rubber connection cylinder which has been widely applied in recent years.

  The prefabricated type cable connection structure includes, for example, a conductor connection tube, an epoxy unit, a premolded insulator, a pressing mechanism, and a protective tube. The conductor connection tube compresses and connects the conductors of the pair of power cables. The epoxy unit has a shield electrode integrally. The shield electrode is connected to the conductor connection pipe. The pre-molded insulator is provided so as to cover a part of the outer periphery of the stripped power cable. The pressing mechanism is configured to press the premolded insulator against the epoxy unit. The protective tube is provided so as to cover them. The protective tube is fixed to, for example, a support base.

  In the prefabricated cable connection structure, the conductor connection tube and the epoxy unit are firmly fixed via the shield electrode, so even if an axial force difference occurs between the pair of power cables on both sides of the cable connection structure. The pair of power cables and the epoxy unit are restrained from being relatively displaced in the axial direction of the power cable.

  However, the prefabricated cable connection structure is difficult to construct on site because the structure is complicated. Further, in the prefabricated type cable connection structure, since the number of parts is large, the cost tends to increase.

  On the other hand, the type using a normal temperature shrinkable rubber connecting cylinder has, for example, a conductor connecting pipe, a rubber connecting cylinder, a protective tube, and a filler. The conductor connection pipe compresses and connects the conductors of the pair of power cables, as in the prefabricated type. The rubber connection cylinder is fitted on these so as to cover the conductor connection pipe and the like. The protective tube is provided so as to cover them. The filler is filled between the rubber connecting cylinder and the protective tube. The rubber connecting tube and the protective tube are fixed to each other via a filler. The protective tube is fixed to, for example, a support base.

  In the type using the cold-shrinkable rubber connecting cylinder, the placement of the rubber connecting cylinder can be completed only by covering the outer diameter of the conductor connecting pipe with the rubber connecting cylinder whose diameter has been expanded in advance. Thereby, it becomes possible to improve the construction property on the spot.

  However, in the type using the normal temperature shrinkable rubber connecting cylinder, the pair of power cables and the rubber connecting cylinder are fixed only by the contracting force and frictional force of the rubber connecting cylinder. For this reason, for example, when an axial force difference occurs between the pair of power cables on both sides of the cable connection structure, and the axial force difference becomes larger than the contraction force and frictional force of the rubber connection tube, the rubber connection tube In contrast to being fixed to the support base via the protective tube, the pair of power cables may be relatively displaced in the axial direction of the power cable. If the conductor connecting tube connecting the conductors of the pair of power cables and the rubber connecting tube are relatively displaced, there is a risk that the electric field distribution around the conductor connecting tube cannot be safely maintained.

  As described above, conventionally, a prefabricated cable connection structure and a cable connection structure using a cold-shrinkable rubber connection cylinder have advantages and disadvantages, respectively. For this reason, a prefabricated type cable connection structure and a type of cable connection structure using a cold-shrinkable rubber connection cylinder are used depending on the location. That is, the prefabricated cable connection structure is resistant to axial force difference but is inferior in workability. Therefore, it has been limited to application to a place where an axial force difference is likely to occur between a pair of power cables. On the other hand, the cable connection structure using a cold-shrinkable rubber connection tube is excellent in workability but weak against axial force differences, so it can be applied to places where there is no axial force difference between a pair of power cables. It was limited to.

  Thus, conventionally, the versatility of each type of cable connection structure is low, which has been a cause of increased costs associated with the overall cable laying. For this reason, it was desired to make the cable connection structure a common structure regardless of the location. That is, a cable connection structure that has both resistance to axial force difference and workability has been desired.

  The present invention is based on the above-described new problem found by the present inventors.

<First Embodiment of the Present Invention>
(1) Cable connection structure The cable connection structure which concerns on 1st Embodiment of this invention is demonstrated using FIG. 1 and FIG. FIG. 1 is a front view and a cross-sectional view showing a cable connection structure according to the present embodiment. FIG. 2A is a cross-sectional view in the axial direction of the power cable, in which the connecting and fixing portion is enlarged, and FIG.

  As shown in FIG. 1, the cable connection structure 10 of the present embodiment is configured to connect a pair of power cables 100 in a straight line. For example, a pair of power cables 100 and a conductor connection tube (compression sleeve) 200 are provided. , A rubber connecting cylinder (rubber unit, rubber block, pre-molded rubber insulator) 300, a protective tube (copper tube) 400, and a filler 480.

  In the following, the “axial direction” of the power cable 100 or the like refers to the direction of the central axis of the power cable 100 or the like, and can be rephrased as the longitudinal direction of the power cable 100 or the like. In addition, the “radial direction” of the power cable 100 or the like refers to a direction perpendicular to the axial direction of the power cable 100 or the like, and can be rephrased as a short direction of the power cable 100 or the like. The “circumferential direction” of the power cable 100 or the like means a direction along the outer periphery of the power cable 100 or the like.

(Power cable)
The power cable 100 is configured as a CV cable (also referred to as a Crosslinked Polyethylene Insulated Cable, XLPE cable) that is a high-voltage underground power transmission cable. For example, a conductor 110 and an inner semiconductive layer (from the center toward the outer periphery) (Not shown), an insulator 130, an external semiconductive layer 140, a cushion tape (pressing tape) 160, a metal sheath (metal shielding layer, corrugated tube) 170, and a sheath 180. The conductor 110 is configured by twisting a plurality of conductor wires (not shown) in a spiral shape. In the power cable 100, the conductor 110, the inner semiconductive layer (not shown), the insulator 130, and the outer semiconductive layer 140 may be referred to as a “cable core”.

  The power cable 100 is peeled off stepwise in the axial direction from one end (stepped off). That is, the conductor 110, the insulator 130, the outer semiconductive layer 140, the cushion tape 160, and the metal sheath 170 are exposed in this order from one end side of the power cable 100.

  A pair of power cables 100 is provided. The pair of power cables 100 are abutted so that the axes of the conductors 110 coincide with each other. Hereinafter, one of the pair of power cables 100 is referred to as a “first power cable 100a” and the other is referred to as a “second power cable 100b”. Note that when the term “power cable 100” is simply used, the first power cable 100a and the second power cable 100b are collectively referred to. Further, an interruption cable 100c described later may be included in the power cable 100.

(Conductor connection pipe)
The conductor connection pipe 200 is configured as a cylindrical member made of metal (for example, copper). Within the conductor connection tube 200, the conductors 110 of the pair of power cables 100 are abutted against each other. In this state, the conductor connecting pipe 200 is compressed in the radial direction. Thereby, the conductors 110 of the pair of power cables 100 are compressed and connected by the conductor connection pipe 200.

  A cover member 280 made of metal (for example, aluminum alloy) is provided so as to cover the outer periphery of the conductor connection pipe 200. The cover member 280 is configured by a pair of half members (not shown), for example. The cover member 280 has, for example, a cylindrical outer peripheral surface. The outer peripheral surface of the cover member 280 forms the same surface as the insulator 130 of the stepped power cable 100.

(Rubber connection tube)
The rubber connecting cylinder 300 is configured as an insulating cylindrical member having a hollow portion penetrating in the axial direction, and is externally fitted to the conductor connecting pipe 200 and a part of each of the pair of power cables 100 so as to cover them. Has been.

  The rubber connection cylinder 300 is configured as a so-called cold shrinkage type. That is, the rubber connection cylinder 300 has an inner diameter smaller than the outer diameter of the power cable 100 in a state where the diameter is not expanded, for example. As a result, the rubber connection tube 300 is elastically contracted at room temperature and is in close contact with the connection portion of the power cable 100.

  Further, the rubber connection tube 300 is configured to relax the electric field around the conductor connection tube 200 while maintaining the insulation around the conductor connection tube 200. Specifically, the rubber connection tube 300 includes, for example, a rubber unit internal semiconductive layer 320, a rubber unit insulating layer 340, a stress cone portion 360, and a rubber unit external semiconductive layer 380.

  The rubber unit internal semiconductive layer 320 is formed in a cylindrical shape so as to cover the outer periphery of the conductor connection pipe 200. The rubber unit internal semiconductive layer 320 is semiconductive and includes, for example, ethylene propylene rubber or silicone rubber and carbon black. The rubber unit internal semiconductive layer 320 is equipotential with the conductor connecting pipe 200.

  The rubber unit insulating layer 340 is provided so as to cover the outer periphery of the rubber unit internal semiconductive layer 320. The rubber unit insulating layer 340 has insulating properties and is made of, for example, ethylene propylene rubber or silicone rubber.

  The stress cone portions 360 are provided on both ends of the rubber unit insulating layer 340 in the axial direction. The stress cone portion 360 has a substantially tapered shape so that the diameter of the stress cone portion 360 is gradually increased away from the inner peripheral surface of the rubber connection tube 300 in the direction from the respective ends of the rubber connection tube 300 toward the center in the axial direction. Is provided. The stress cone portion 360 has semiconductivity and is made of, for example, the same material as that of the rubber unit internal semiconductive layer 320. Of the stress cone portion 360, the portion constituting the inner peripheral surface of the rubber connection cylinder 300 is in contact with the outer semiconductive layer 140 of the stepped power cable 100. With such a configuration of the stress cone portion 360, equipotential lines can be evenly distributed around the outer semiconductive layer 140 to suppress electric field concentration.

  The rubber unit outer semiconductive layer 380 is provided so as to cover the outer periphery of the rubber unit insulating layer 340. The rubber unit outer semiconductive layer 380 has semiconductivity and is made of, for example, the same material as that of the rubber unit inner semiconductive layer 320. Thereby, the inside of the rubber connection cylinder 300 can be electrically shielded.

  A metal mesh tape may be wound so as to cover the outer periphery of the rubber connection tube 300.

(Protection tube)
The protective tube 400 is provided so as to cover the rubber connecting cylinder 300 and a part of each of the pair of power cables 100, and is configured to protect them. The protective tube 400 is made of, for example, copper.

  The protective tube 400 has a pair of flange portions 420 that are expanded in the radial direction. Each of the pair of flange portions 420 is provided so as to surround the outer periphery of the protective tube 400. The protective tube 400 is divided in the axial direction via the pair of flange portions 420. The pair of flange portions 420 of the divided protective tube 400 are in contact with each other via packing (not shown). Moreover, each of a pair of flange part 420 has a bolt insertion hole (not shown) in the position which mutually overlaps. The bolts (not shown) and nuts (not shown) inserted into the bolt insertion holes of the pair of flange portions 420 are fastened with the pair of flange portions 420 sandwiched therebetween, so that the divided protective tubes 400 are connected to each other. Is fixed.

  The flange portion 420 is made of, for example, a nonmagnetic metal. Specifically, the flange portion 420 is made of brass, for example. Thereby, the thermal conductivity of the flange part 420 can be improved. Further, when the power cable 100 is energized, electromagnetic induction of the flange portion 420 can be suppressed, and heat generation of the flange portion 420 itself can be suppressed.

  In the present embodiment, the protective tube 400 further includes an inner flange portion 440 that extends inward in the radial direction of the protective tube 400 inside the flange portion 420 in the radial direction. The inner flange 440 is provided so as to surround the inner periphery of the protective tube 400, for example. The inner flange 440 has, for example, a plurality of screw holes (not shown) provided at predetermined intervals in the circumferential direction. The inner flange portion 440 will be further described later together with the connection fixing portion 20.

  An epoxy insulating cylinder 620 is provided in a part of the protective tube 400 so as to surround the outer periphery of the power cable 100. In the present embodiment, the epoxy insulating cylinder 620 is provided on the second power cable 100b side of the rubber connecting cylinder 300 in the protective tube 400, for example.

  The protective tube 400 is insulated on both sides in the axial direction with the epoxy insulating cylinder 620 interposed therebetween. Thereby, the pair of power cables 100 can be electrically separated (so-called edge cutting).

  Each of the axial ends of the protective tube 400 and the power cable 100 are sealed. Specifically, seal portions 640 are provided at both ends of the protective tube 400 in the axial direction. The seal part 640 is made of, for example, a sealing tape with an adhesive layer or a shrinkable sealing tube. Thereby, the infiltration of moisture into the protective tube 400 can be suppressed.

  The protective tube 400 has an inlet (not shown). A filler 480 described later is injected into the protective tube 400 through the injection port of the protective tube 400.

  Further, the protective tube 400 is placed on, for example, a predetermined support base (support metal) (not shown) and fixed to the support base.

(Filler)
The filler 480 is filled between the rubber connecting tube 300 and the protective tube 400 in the protective tube 400. Thereby, the infiltration of moisture into the protective tube 400 can be suppressed. In addition, since the filler 480 fills the gap in the protective tube 400, formation of an air layer that becomes a thermal resistance in the protective tube 400 can be suppressed. As a result, heat dissipation from the power cable 100 toward the outside can be improved.

  The filler 480 is configured, for example, by curing a resin composition having a predetermined fluidity at a predetermined temperature before being cured. Thereby, the filling material 480 can be easily filled in the protective tube 400 by pouring the resin composition from the inlet of the protective tube 400 and curing it.

  Examples of the resin composition constituting the filler 480 include a two-component curable, so-called waterproof blend. The waterproof blend is, for example, at least one of a urethane resin, an epoxy resin, and a silicon resin.

  By filling the protective tube 400 with the filler 480 and curing, the rubber connecting tube 300 and the protective tube 400 are fixed to each other via the filler 480. For this reason, the rubber connection cylinder 300 is also fixed (indirectly) to the support base via the filler 480 and the protective tube 400.

(Connection fixing part)
As shown in FIG. 1, the connecting and fixing portion 20 connects and fixes at least one of the pair of power cables 100 and the protecting tube 400 inside the protecting tube 400 and outside the rubber connecting tube 300 in the axial direction. Yes. In the present embodiment, for example, only one connection fixing unit 20 is provided, and the first power cable 100a and the protective tube 400 are connected and fixed. Thereby, when an axial force difference is generated between the pair of power cables 100, the movement in the axial direction due to the expansion and contraction of the power cable 100 in the axial direction can be restricted by the connecting and fixing portion 20.

  As shown in FIGS. 2A and 2B, the connecting and fixing portion 20 is formed by connecting metal members together by fastening bolts or the like except for a portion that directly contacts the outer periphery of the power cable 100, for example. It is configured. Specifically, the connection fixing part 20 includes, for example, a clamp (gripping part) 520, a cushion layer (buffer layer) 510, and a connection plate part 560.

  The clamp 520 is configured, for example, as a metal cylindrical member having a hollow portion penetrating in the axial direction. For example, the clamp 520 is provided so as to surround an outer periphery of at least one of the pair of power cables 100 and is configured to hold the power cable 100. In the present embodiment, the clamp 520 holds, for example, a portion of the first power cable 100a where the external semiconductive layer 140 is exposed. As described above, the clamp 520 directly grips the first power cable 100a on the outer side in the axial direction of the rubber connection cylinder 300, whereby the first power cable 100a can be firmly gripped (restrained).

  The clamp 520 is made of a nonmagnetic metal, for example, like the flange portion 420 of the protective tube 400. Specifically, the clamp 520 is made of brass, for example. Thereby, while improving the heat conductivity of the clamp 520, the heat_generation | fever of the clamp 520 itself resulting from electromagnetic induction can be suppressed.

  The clamp 520 has, for example, a pair of half members 530. Each of the pair of half members 530 is configured by, for example, dividing a cylindrical member by a half surface along the axial direction. The pair of halved members 530 form a hollow portion by making their recesses (not shown) face each other, and sandwich the power cable 100 in the hollow portion.

  Each of the pair of half members 530 includes, for example, a clamp end flange 532 and a clamp peripheral flange 540.

  For example, the clamp end flanges 532 extend from the outer periphery of the half member 530 to the outside in the radial direction at both ends in the circumferential direction of the half member 530, and are provided along the axial direction. The clamp end flanges 532 of the pair of half members 530 are in contact with each other. Each of the pair of clamp end flanges 532 has a bolt insertion hole (not shown) at a position overlapping each other. The bolts (not shown) and the nuts (not shown) inserted into the bolt insertion holes of the pair of clamp end flanges 532 are fastened with the pair of clamp end flanges 532 sandwiched therebetween, so that a pair of half The split members 530 are fixed to each other.

  The clamp circumferential flange 540 is provided, for example, so as to surround the outer periphery of the half member 530 and extends outward from the outer periphery of the half member 530 in the radial direction. The clamp circumferential flange 540 has a plurality of screw holes (not shown) provided at predetermined intervals in the circumferential direction. A later-described connecting plate portion 560 is connected to the clamp circumferential flange portion 540.

  For example, the cushion layer 510 is provided so as to cover at least one of the pair of power cables 100, and is interposed between at least one of the pair of power cables 100 and the clamp 520. In the present embodiment, the cushion layer 510 is provided so as to cover the outer periphery of the first power cable 100a, for example.

  The cushion layer 510 has, for example, a predetermined elasticity and is configured to absorb the expansion of the power cable 100 in the radial direction. That is, when the power cable 100 expands in the radial direction, the cushion layer 510 is elastically contracted in the thickness direction by the amount of expansion in the radial direction of the power cable 100.

  The cushion layer 510 is made of rubberized tape, for example. Thereby, the predetermined elasticity of the cushion layer 510 can be realized.

  The cushion layer 510 may have semiconductivity, for example. Thereby, the surface where the external semiconductive layer 140 of the power cable 100 is electrically connected to the metal clamp 520 can be widened via the semiconductive cushion layer 510. Here, for example, a metal mesh tape may be wound around the outer periphery of the rubber connection cylinder 300. Metal shielding members such as the metal mesh tape and the metal protective tube 400 not only cause an accident current (ground fault current) when a ground fault occurs in the power cable 100 but also a sheath current (insulator). Currents due to electromagnetic induction). In such a configuration, since the cushion layer 510 has semiconductivity, the external semiconductive layer 140 of the power cable 100 and the above-described metal shielding member can be electrically connected. In addition, when the nominal voltage of the power cable 100 is low, the cushion layer 510 may not have semiconductivity.

  The gripping force with which the clamp 520 grips the power cable 100 is, for example, at least larger than the restraining force with which the rubber connecting tube 300 restrains the power cable 100, and an axial force difference (power cable) that can occur between the pair of power cables 100. It is preferably greater than 100 (relative stretching force in the axial direction). Note that the restraining force of the rubber connection tube 300 here depends on, for example, the elastic contraction force of the rubber connection tube 300 and the frictional force caused by the contact between the rubber connection tube 300 and the power cable 100.

  As a specific configuration, for example, the inner diameter of the clamp 520, the thickness of the cushion layer 510, the fastening force of the bolt that fixes the pair of half members 530, and the clamp so that the gripping force of the clamp 520 satisfies the above conditions A length in the axial direction of 520 is set. Thereby, when an axial force difference arises between a pair of electric power cables 100, it can control that clamp 520 and electric power cable 100 shift relatively in the direction of an axis of electric power cable 100.

  For example, the connecting plate portion 560 is configured such that the inner flange portion 440 and the clamp 520 of the protective tube 400 are separated from each other and are connected to each other.

  Specifically, for example, two connecting plate portions 560 are provided. Each of the two connecting plate portions 560 has, for example, a semicircular fan shape and is disposed so as to surround the outer periphery of the clamp 520. The inner diameter in the radial direction of the connecting plate portion 560 is, for example, equal to or slightly larger than the outer diameter of the clamp 520. Further, the outer diameter in the radial direction of the connecting plate portion 560 is, for example, equal to or slightly smaller than the inner diameter of the protective tube 400. The connecting plate portion 560 is in contact with each of the clamp peripheral flange portion 540 of the clamp 520 and the inner flange portion 440 of the protective tube 400.

  In the present embodiment, the connecting plate portion 560 contacts, for example, the rubber connecting tube 300 side of the inner flange portion 440 of the protective tube 400 and the rubber connecting tube 300 side of the clamp peripheral flange portion 540 of the clamp 520. Touching. In addition, arrangement | positioning of the connection board part 560 is not restricted to the said structure. For example, the connecting plate portion 560 may be in contact with the rubber connecting tube 300 side of the inner flange portion 440 and the opposite side of the clamp peripheral flange portion 540 with respect to the rubber connecting tube 300 side, Alternatively, the inner flange 440 may be in contact with the side opposite to the rubber connecting tube 300 side and the rubber connecting tube 300 side of the clamp peripheral flange 540, or the inner flange 440. The rubber connecting tube 300 may be in contact with the side opposite to the rubber connecting tube 300 side, and the clamp peripheral flange 540 may be in contact with the side opposite to the rubber connecting tube 300 side. In the protective tube arrangement step described later, the connection order may be changed according to the arrangement of the connection plate portion 560.

  The connecting plate portion 560 has, for example, a plurality of bolt insertion holes (not shown) provided at predetermined intervals in the circumferential direction on the inner side and the outer side in the radial direction. For example, the connection plate portion 560 and the clamp 520 are connected and fixed by screwing a bolt (not shown) inserted into the bolt insertion hole of the connection plate portion 560 into a screw hole of the clamp peripheral flange portion 540. . On the other hand, for example, when the bolt (not shown) inserted into the bolt insertion hole of the connecting plate portion 560 is screwed into the screw hole of the inner flange portion 440, the connecting plate portion 560 and the protective tube 400 are connected and fixed. Has been.

  Further, the connecting plate portion 560 is made of a nonmagnetic metal, for example, similarly to the flange portion 420 and the clamp 520 of the protective tube 400. Specifically, the connecting plate portion 560 is made of brass, for example. Thereby, while improving the heat conductivity of the connection board part 560, the heat_generation | fever of the connection board part 560 itself resulting from electromagnetic induction can be suppressed.

(Specific dimensions, etc.)
The nominal voltage of the power cable 100 to which the cable connection structure 10 of the present embodiment is applied is, for example, 66 kV or more and 500 kV or less. The outer diameter of the power cable 100 is, for example, not less than 30 mm and not more than 130 mm.

  The length of the conductor connection tube 200 in the axial direction is, for example, 90 mm or more and 170 mm or less. The length of the rubber connecting tube 300 in the axial direction is, for example, 500 mm or more and 800 mm or less, and the maximum outer diameter of the rubber connecting tube 300 is, for example, 90 mm or more and 230 mm or less.

  The axial length of the clamp 520 that constitutes the connection fixing unit 20 is, for example, 200 mm or more and 800 mm or less, and the inner diameter of the clamp 520 is, for example, 40 mm or more and 150 mm or less.

  The length of the protection tube 400 in the axial direction is, for example, not less than 800 mm and not more than 3500 mm, and the outer diameter of the protection tube 400 is, for example, not less than 130 mm and not more than 320 mm.

(2) Manufacturing method of cable connection structure (cable connection method)
Next, with reference to FIG. 1 and FIG. 2, the manufacturing method of the cable connection structure which concerns on this embodiment is demonstrated.

(Preparation process)
First, a pair of power cables 100, a conductor connection pipe 200, a rubber connection cylinder 300, and a protection pipe 400 constituting the cable connection structure 10 are prepared.

  At this time, an inner core ribbon (not shown) is spirally wound to form a cylindrical inner core (not shown), and the inner core is inserted into the hollow portion of the rubber connection cylinder 300. As a result, the diameter of the rubber connecting tube 300 is increased.

  Moreover, at this time, it peels off in steps in an axial direction from one end of each of the pair of power cables 100. Thereby, the conductor 110, the insulator 130, the external semiconductive layer 140, the cushion tape 160, and the metal sheath 170 are exposed in this order from the one end side of the power cable 100.

(Insertion process)
When the members constituting the cable connection structure 10 are prepared, the rubber connection tube 300 and the protection tube 400 are passed through the power cable 100, and the rubber connection tube 300 and the protection tube 400 are respectively released to predetermined positions of the power cable 100. deep. Specifically, a part of the protective tube 400 having the inner flange portion 440 and the rubber connecting tube 300 expanded in diameter by the inner core are passed through the first power cable 100a. On the other hand, the other part of the protective tube 400 having the epoxy insulating cylinder 620 is passed through the second power cable 100b.

(Matching and compression connection process)
When each of the rubber connecting cylinder 300 and the protective tube 400 is passed through the power cable 100, the pair of power cables 100 are abutted with each other in the conductor connecting tube 200 with the axes of the conductors 110 matching each other. When the pair of power cables 100 are abutted, the conductors 110 of the pair of power cables 100 are compression-connected by the conductor connection pipe 200. When the conductor connection pipe 200 is compression-connected, the cover member 280 is covered so as to cover the outer periphery of the conductor connection pipe 200.

(Rubber connection tube placement process)
When the compression connection step is completed, the rubber connection tube 300 is fitted on the conductor connection tube 200 and the pair of power cables 100 so as to cover a part of each. Specifically, the rubber connecting cylinder 300 expanded in diameter by the inner core is moved from the position where it has escaped to the first power cable 100 to a position overlapping the conductor connecting pipe 200. When the rubber connecting tube 300 is disposed at a predetermined position, the inner core ribbon is gradually unwound from one end side in the axial direction of the rubber connecting tube 300, and the diameter of the rubber connecting tube 300 is gradually reduced in the axial direction. Thereby, the rubber connection cylinder 300 can be externally fitted to the conductor connection tube 200 and a part of each of the pair of power cables 100 so as to be in close contact with each other.

(Protection tube placement process)
When the rubber connecting cylinder 300 is disposed, the protective tube 400 is provided so as to cover each of the rubber connecting cylinder 300 and the pair of power cables 100. At this time, at least one of the pair of power cables 100 and the protective tube 400 are connected and fixed by the connecting and fixing portion 20 inside the protective tube 400 and outside the rubber connecting tube 300 in the axial direction.

  Specifically, for example, first, the cushion layer 510 is formed so as to cover the outer periphery of the portion of the first power cable 100 where the external semiconductive layer 140 is exposed. When the cushion layer 510 is formed, a hollow portion is formed by making the concave portions of the pair of half members 530 constituting the clamp 520 face each other, and the first power cable 100a is sandwiched in the hollow portion. When the first power cable 100a is sandwiched between the pair of half members 530, the bolt is inserted into the bolt insertion hole of the pair of clamp end flanges 532, and the bolt and the nut are sandwiched between the pair of clamp end flanges 532. By fastening, a pair of half member 530 is fixed. Accordingly, the first power cable 100a is held by the clamp 520.

  When the first power cable 100a is gripped by the clamp 520, the bolt is inserted into the bolt insertion hole of the connection plate portion 560, and the bolt is screwed into the screw hole of the clamp peripheral portion 540, whereby the connection plate portion 560 and the clamp are clamped. 520 is connected and fixed. Next, the protective tube 400 having the inner flange portion 440 is moved from the position where it escapes to the first power cable 100a to a position overlapping the clamp 520. When the protective tube 400 is disposed at a predetermined position, the bolt is inserted into the bolt insertion hole of the connecting plate portion 560, and the bolt is screwed into the screw hole of the inner flange portion 440, thereby connecting the connecting plate portion 560 and the protective tube 400. Connect and fix.

  As described above, the first power cable 100a and the protective tube 400 can be connected and fixed by the connecting and fixing portion 20.

  When the first power cable 100a and the protection tube 400 are connected and fixed by the connection fixing unit 20, the remaining protection tube 400 is disposed so as to cover each of the rubber connection tube 300 and the pair of power cables 100. When the protective tube 400 is arranged at a predetermined position, a bolt is inserted into the bolt insertion hole of the pair of flange portions 420, and the bolt and the nut are fastened with the pair of flange portions 420 interposed therebetween, thereby dividing the divided protective tube 400. Fix each other.

  When the protection tubes 400 are fixed to each other, the seal portions 640 are formed on both ends of the protection tube 400 in the axial direction. Thereby, between each of the both ends of the axial direction of the protective tube 400 and the power cable 100 can be sealed.

(Filler filling process)
When the sealing between the protective tube 400 and the power cable 100 is completed, the filler 480 is injected into the protective tube 400 from the inlet of the protective tube 400, and the filler is interposed between the rubber connection tube 300 and the protective tube 400. Fill 480. After filling the filler 480, the filler 480 is cured under predetermined conditions.

  The cable connection structure 10 of this embodiment is manufactured by the above.

(3) Effects according to the present embodiment According to the present embodiment, the following one or more effects are achieved.

(A) In the present embodiment, the connection fixing unit 20 connects and fixes at least one of the pair of power cables 100 and the protection tube 400 on the inner side of the protection tube 400 and on the outer side of the rubber connecting tube 300 in the axial direction. ing. Since the protective tube 400 is fixed to the support base, the power cable 100 provided with the connection fixing portion 20 of the pair of power cables is also connected to the support base via the connection fixing portion 20 and the protection tube 400 (indirectly). To be fixed). Thereby, when an axial force difference is generated between the pair of power cables 100, the movement in the axial direction due to the expansion and contraction of the power cable 100 in the axial direction can be restricted by the connecting and fixing portion 20.

  Specifically, when the first power cable 100a to which the connection fixing part 20 is connected and fixed expands and contracts relative to the second power cable 100b in the axial direction, the movement of the first power cable 100a in the axial direction is It can be directly regulated by the connecting and fixing portion 20. On the other hand, when the second power cable 100b to which the connection fixing part 20 is not connected and fixed expands and contracts relative to the first power cable 100a in the axial direction, the expansion and contraction force in the axial direction of the second power cable 100b is a conductor. It is transmitted to the connecting and fixing part 20 via the connecting pipe 200 and a part of the first power cable 100a. Thereby, the movement of the second power cable 100b in the axial direction can be indirectly restricted by the connection fixing portion 20. As described above, by restricting the movement in the axial direction due to the expansion and contraction in the axial direction of the power cable 100 by the connecting and fixing portion 20, even when an axial force difference is generated between the pair of power cables 100, It is possible to suppress the pair of power cables 100, the rubber connecting cylinder 300, and the protective tube 400 from being relatively displaced in the axial direction of the power cable 100. As a result, the electric field distribution around the conductor connection tube 200 can be safely maintained.

  Moreover, in the cable connection structure 10 of this embodiment, the normal temperature shrinkable rubber connection cylinder 300 can be used as described above. Thereby, the workability in the field which connects a pair of electric power cables 100 can be improved.

  As described above, according to this embodiment, it is possible to provide the cable connection structure 10 that achieves both resistance to axial force difference and workability. Thereby, it becomes possible to make the cable connection structure 10 a common structure irrespective of the place where the power cable 100 is installed.

(B) The connection fixing part 20 is holding the part (namely, cable core) which the external semiconductive layer 140 exposed among the power cables 100. FIG. Thereby, the power cable 100 and the protective tube 400 can be firmly connected and fixed. Further, the connection fixing part 20 is accommodated inside the protective tube 400. Thereby, the waterproofness of the part which the external semiconductive layer 140 exposed among the power cables 100 and the connection fixing | fixed part 20 holding it can be ensured.

  Further, since the coupling fixing portion 20 is accommodated inside the protective tube 400, there is no protruding portion related to the coupling fixing portion 20 outside the protective tube 400, and the appearance of the cable connection structure 10 is a conventional cable. Compared to the appearance of the connection structure, it is almost the same. Thereby, it can suppress that the cable connection structure 10 whole becomes excessive resulting from having provided the connection fixing | fixed part 20. FIG.

(C) Since the protective tube 400 is not movable but is fixed to the support base, the relative positional relationship between the pair of power cables 100, the rubber connecting tube 300, and the protective tube 400 is stably maintained. be able to.

  Here, for example, a cable connection structure in which the protective tube is movable, that is, a cable connection in which the protective tube is configured to be movable in the axial direction of the power cable when a difference in axial force occurs between the pair of power cables. A structure is conceivable. In this case, when the protective tube moves so as to reduce the axial force difference between the pair of power cables, there is a possibility that the power cable is twisted in the spiral twisted direction of the conductor. For this reason, the protective tube once moved may not be restored. As a result, the relative positional relationship between the pair of power cables, the rubber connecting cylinder, and the protective tube may become unstable.

  On the other hand, in the present embodiment, the protective tube 400 is fixed to the support base, and the power cable 100 is also fixed to the support base via the connection fixing portion 20 and the protective tube 400. Thereby, even if it is a case where an axial force difference arises between a pair of electric power cables 100, it can control that electric power cable 100 twists in the spiral twisted line direction of conductor 110. As a result, the relative positional relationship between the pair of power cables 100, the rubber connecting cylinder 300, and the protective tube 400 can be stably maintained.

(D) The protective tube 400 has an inner flange portion 440 extending inward in the radial direction. In addition, the connection fixing unit 20 includes a clamp 520 that holds at least one of the pair of power cables 100, and a connection plate unit 560 that connects the inner flange portion 440 and the clamp 520 by fastening bolts or the like. doing. With such a configuration, the power cable 100 and the protective tube 400 can be firmly connected and fixed. In the present embodiment, for example, when the first power cable 100a expands and contracts relative to the second power cable 100b in the axial direction, the first power cable 100a held by the clamp 520 is connected via the connecting plate portion 560. Thus, the inner tube 440 of the protective tube 400 can be locked. On the other hand, when the second power cable 100b expands and contracts relative to the first power cable 100a in the axial direction, the first power cable 100b, the first power cable 100a, the clamp 520, and the connecting plate portion 560 are used for the first power cable 100b. 2 The power cable 100 b can be locked to the inner flange 440 of the protective tube 400. As a result, the axial movement caused by the expansion and contraction of the power cable 100 in the axial direction can be tightly restricted by the connecting and fixing portion 20. As a result, it is possible to reliably suppress the pair of power cables 100, the rubber connecting cylinder 300, and the protective tube 400 from being relatively displaced in the axial direction of the power cable 100.

(E) Since the cushion layer 510 is interposed between at least one of the pair of power cables 100 and the clamp 520, the clamp 520 maintains the gripping force for gripping the power cable 100, and the power cable 100 When the power cable 100 expands in the radial direction by energization, the expansion can be absorbed by the cushion layer 510. Thereby, it is possible to achieve both suppression of the relative displacement in the axial direction of the pair of power cables 100 with respect to the rubber connection cylinder 300 and the protective tube 400 and allow the expansion of the power cable 100 in the radial direction. .

  Further, the cushion layer 510 is interposed between at least one of the pair of power cables 100 and the clamp 520, so that the clamp 520 can be softly brought into contact with the power cable 100. The gripping force for gripping the cable 100 can be buffered. As a result, it is possible to prevent the power cable 100 from being overloaded or causing damage to the power cable 100 due to the gripping of the clamp 520.

(4) Modified Example of First Embodiment The above-described embodiment can be changed as in the following modified example as necessary. Hereinafter, only elements different from the above-described embodiment will be described, and elements substantially the same as those described in the above-described embodiment will be denoted by the same reference numerals and description thereof will be omitted.

(4-1) Modification 1 of the first embodiment
A cable connection structure 10 according to Modification 1 of the present embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a cable connection structure according to Modification 1 of the present embodiment. Note that FIG. 3 shows the cable connection structure 10 in a simplified manner, and omits the lower half of the configuration. The same applies to FIGS. 5 and 6 described later.

  The cable connection structure 10 according to the first modification of the present embodiment is different from the above-described embodiment in that a plurality of connection fixing portions 20 are provided.

(Cable connection structure)
As shown in FIG. 3, in the cable connection structure 10 of the first modification of the present embodiment, a pair of connection fixing portions 20 are provided with the rubber connection cylinder 300 interposed therebetween. Specifically, of the pair of connection fixing portions 20, the first connection fixing portion 21 connects and fixes the first power cable 100a and the protective tube 400. On the other hand, among the pair of connection fixing portions 20, the second connection fixing portion 22 connects and fixes the second power cable 100b and the protective tube 400.

  With the above configuration, the outer semiconductive layer 140 of the first power cable 100a and the protective tube 400 are electrically connected via the first connection fixing portion 21, and the outer semiconductive layer 140 of the second power cable 100b is connected to the outer semiconductive layer 140. The protective tube 400 is electrically connected via the second connection fixing portion 22. For this reason, the epoxy insulating cylinder 620 for edge cutting is, for example, between the first connection fixing part 21 and the second connection fixing part 22 (more specifically, between the second connection fixing part 22 and the rubber connection cylinder 300). It is preferable that it is provided in between. Accordingly, the protective tube 400 connected and fixed to the first power cable 100a via the first connection fixing portion 21 and the second electric power cable 100b connected and fixed to the second power cable 100b via the second connection fixing portion 22. The protective tube 400 can be electrically separated.

(Manufacturing method of cable connection structure)
In the protective tube arranging step, the first power cable 100a and the protective tube 400 are connected and fixed by the first connecting and fixing portion 21, and the second power cable 100b and the protective tube 400 are connected and fixed by the second connecting and fixing portion 22. You can do things in order.

(effect)
In the first modification of the present embodiment, when a pair of coupling fixing portions 20 are provided with the rubber connecting cylinder 300 interposed therebetween, when an axial force difference is generated between the pair of power cables 100, that is, a pair of powers. When one of the cables 100 expands and contracts relative to the other in the axial direction, the movement in the axial direction caused by the expansion and contraction in the axial direction of the one power cable 100 is It can be regulated by any one of the connecting and fixing portions 20. Thereby, it can suppress that the expansion-contraction force of one power cable 100 is applied to the conductor connection pipe | tube 200 which connects the conductors 110 mutually. As a result, even when an axial force difference occurs between the pair of power cables 100, the conductor connection tube 200 and the rubber connection tube 300 are reliably suppressed from being displaced relative to each other in the axial direction of the power cable 100. can do.

(4-2) Modification 2 of the first embodiment
A cable connection structure 10 according to Modification 2 of the present embodiment will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view of a clamp according to the second modification of the present embodiment.

  In the cable connection structure 10 of the modification 2 of this embodiment, the structure of the clamp 520 of the connection fixing | fixed part 20 differs from the above-mentioned embodiment.

(Connection fixing part)
As shown in FIG. 4, in the cable connection structure 10 of the second modification of the present embodiment, the clamp 520 of the coupling fixing portion 20 has, for example, irregularities on at least the cushion layer 510 side. In this modification, the inner peripheral surface and the outer peripheral surface of each of the pair of half members 530 constituting the clamp 520 have, for example, periodic irregularities in the circumferential direction. That is, in each of the pair of half members 530, the recesses having a relatively reduced diameter and the protrusions having a relatively larger diameter are alternately arranged in the circumferential direction. The outer peripheral surface of the cushion layer 510 is deformed so as to follow the unevenness on the inner peripheral surface side of each of the pair of half members 530.

  In this modification, each of the pair of half members 530 has irregularities not only on the inner peripheral surface side but also on the outer peripheral surface side, but each outer peripheral surface of the pair of half members 530 There may be no unevenness on the side.

(effect)
In the second modification of the present embodiment, the clamp 520 of the coupling fixing portion 20 has irregularities on at least the cushion layer 510 side, so that the area where the clamp 520 contacts the cushion layer 510 can be increased. Thereby, the gripping force with which the clamp 520 grips the power cable 100 via the cushion layer 510 can be improved.

<Second Embodiment of the Present Invention>
Next, a second embodiment of the present invention will be described.

  Here, a case where an accident occurs in the power cable line will be described. If an accident occurs in the power cable line, the accident point is detected, and the power cable near the accident point is cut and removed. If the power cable near the accident point is removed, the power cable is shortened by the amount removed. For this reason, it is necessary to insert a new power cable between the remaining pair of power cables so that the removed power cables are supplemented. Here, the newly inserted power cable is called, for example, an “interrupt cable”. In the cable connection structure in which the interrupting cable is inserted in this way, the same connection fixing part as that in the first embodiment can be applied.

  In addition, the cable connection structure in which an interruption cable is interrupted is not restricted to the case of the above-mentioned accident recovery. The cable connection structure into which the interrupt cable is inserted may be applied to, for example, disassembling a connection part such as system switching (route change) and reconnecting the power cable. Also in the cable connection structure in such a case, the same connection fixing part as the above-mentioned 1st Embodiment is applicable.

  This embodiment is different from the first embodiment in that it has an interrupt cable 100c. Hereinafter, only the elements different from the first embodiment will be described in the same manner as the modification of the first embodiment.

(1) Cable connection structure The cable connection structure which concerns on 2nd Embodiment is demonstrated using Fig.5 (a). FIG. 5A is a cross-sectional view showing the cable connection structure according to the present embodiment.

  As shown in FIG. 5A, the cable connection structure 12 of the present embodiment is configured to connect a pair of power cables 100 in a straight line with an insertion cable 100c interposed therebetween. For example, the first power cable 100a A second power cable 100b, an interruption cable (relay cable, interpolation cable) 100c, a first conductor connection tube 200a, a second conductor connection tube 200b, a first rubber connection tube 300a, and a second rubber connection. The cylinder 300b, the protective tube 400, the filler 480, and the connection fixing part 20 are provided.

(Interrupt cable)
The interrupt cable 100c is configured similarly to the cable core of the first power cable 100a and the like, for example. That is, the interrupt cable 100c includes, for example, a conductor 110, an inner semiconductive layer, an insulator 130, and an outer semiconductive layer 140 constituting the outermost layer of the interrupt cable 100c from the center toward the outer periphery. Have.

  The interrupt cable 100c is interposed between the first power cable 100a and the second power cable 100b. In addition, the interrupt cable 100c is abutted against the first power cable 100a and the second power cable 100b so that the axes of the conductors 110 coincide with each other. Hereinafter, the first power cable 100a, the second power cable 100b, and the interrupt cable 100c connected in a straight line may be referred to as a “power cable group”.

  The length in the axial direction of the interrupt cable 100c in the present embodiment is, for example, equal to or longer than the shortest length capable of unwinding the inner core ribbon that expands the diameter of each of the first rubber connection tube 300a and the second rubber connection tube 300b. It is. Specifically, the axial length of the interrupt cable 100c is, for example, not less than 300 mm and not more than 2000 mm.

(Conductor connection pipe)
The first conductor connection pipe 200a compressively connects the conductors 110 of the first power cable 100a and the interrupt cable 100c. The second conductor connecting pipe 200b compresses and connects the conductors 110 of the second power cable 100b and the interrupt cable 100c.

(Rubber connection tube)
The first rubber connection tube 300a is fitted on the first conductor connection tube 200a, a part of the first power cable 100a, and a part of the interrupt cable 100c. The second rubber connection tube 300b is fitted on the second conductor connection tube 200b, a part of the second power cable 100b, and a part of the interrupt cable 100c.

(Protection tube)
The protective tube 400 is provided so as to cover the first rubber connection tube 300a, the second rubber connection tube 300b, a part of the first power cable 100a, the interruption cable 100c, and a part of the second power cable 100b. Are configured to protect all of them.

(Filler)
The filler 480 is filled in the protective tube 400 between the first rubber connection tube 300a, the second rubber connection tube 300b, and the protection tube 400.

(Connection fixing part)
The connecting and fixing portion 20 of the present embodiment includes the first power cable 100a and the second power cable 100b inside the protective tube 400 and outside the first rubber connection tube 300a and the second rubber connection tube 300b in the axial direction. And the protective tube 400 are connected and fixed. In the present embodiment, for example, only one connection fixing unit 20 is provided, and the first power cable 100a and the protective tube 400 are connected and fixed.

(2) Manufacturing method of cable connection structure Next, the manufacturing method of the cable connection structure of this embodiment is demonstrated.

(Preparation process)
First, the first power cable 100a, the second power cable 100b, the interrupt cable 100c, the first conductor connection pipe 200a, the second conductor connection pipe 200b, and the first rubber connection cylinder constituting the cable connection structure 12 300a, the second rubber connecting cylinder 300b, and the protective tube 400 are prepared.

(Insertion process)
Next, a part of the protective tube 400 and the first rubber connecting cylinder 300a are passed through the first power cable 100a. On the other hand, the second rubber connecting tube 300b and the other part of the protective tube 400 are passed through the second power cable 100b.

(Matching and compression connection process)
Next, the interrupt cable 100c is interposed between the first power cable 100a and the second power cable 100b, and the conductors 110 of the first power cable 100a and the interrupt cable 100c are compressed by the first conductor connecting pipe 200a. Connecting. Further, the conductors 110 of the second power cable 100b and the interrupt cable 100c are compression-connected by the second conductor connection pipe 200b.

(Rubber connection tube placement process)
Next, the first rubber connecting tube 300a is fitted onto the first conductor connecting tube 200a, a part of the first power cable 100a, and the interrupt cable 100c. Further, the second rubber connecting tube 300b is fitted on the second conductor connecting tube 200b, a part of the second power cable 100b, and a part of the interrupt cable 100c.

(Protection tube placement process)
Next, the first power cable 100 a and the protective tube 400 are connected and fixed by the connection fixing unit 20. When the first power cable 100a and the protective tube 400 are connected and fixed by the connecting and fixing portion 20, the divided protective tubes 400 are fixed with bolts.

(Filler filling process)
Next, in the protective tube 400, a filler 480 is filled between the rubber connecting tube 300 and the protective tube 400 and cured.

  The cable connection structure 10 of this embodiment is manufactured by the above.

(3) Effects according to the present embodiment In the cable connection structure 12 in which the interrupt cable 100c is interposed between the first power cable 100a and the second power cable 100b, the connection fixing portion 20 is provided inside the protective tube 400 and At least one of the first power cable 100a and the second power cable 100b and the protective tube 400 are connected and fixed outside in the axial direction of the first rubber connection tube 300a and the second rubber connection tube 300b. As a result, when the axial force difference is generated between the pair of power cables 100 with the interruption cable 100c interposed therebetween, the axial movement caused by the expansion and contraction of the power cable 100 in the axial direction is restricted by the connecting and fixing portion 20. can do.

  Specifically, when the first power cable 100a to which the connection fixing part 20 is connected and fixed expands and contracts relative to the second power cable 100b in the axial direction, similarly to the first embodiment, the first power cable The movement of 100a in the axial direction can be directly restricted by the connecting and fixing portion 20. On the other hand, when the second power cable 100b to which the connection fixing portion 20 is not connected and fixed is relatively expanded and contracted in the axial direction with respect to the first power cable 100a, the expansion and contraction force in the axial direction of the second power cable 100b is The second conductor connection pipe 200b, the interrupt cable 100c, the first conductor connection pipe 200a, and the first power cable 100a are transmitted to the connection fixing portion 20 through a part thereof. Thereby, the movement of the second power cable 100b in the axial direction can be indirectly restricted by the connection fixing portion 20. Further, when the interruption cable 100c expands and contracts relative to the first power cable 100a and the second power cable 100b in the axial direction, the expansion / contraction force in the axial direction of the interruption cable 100c causes the first conductor connecting pipe 200a and It is transmitted to the connection fixing part 20 through a part of the first power cable 100a. Thereby, the movement of the insertion cable 100c in the axial direction can be indirectly restricted by the connecting and fixing portion 20.

  As described above, in the cable connection structure 12 in which the interrupt cable 100c is interposed, when an axial force difference is generated between the pair of power cables 100 with the interrupt cable 100c interposed therebetween, or the axial force is caused by the interrupt cable 100c. Even when a difference occurs, the power cable group, the first rubber connection tube 300a, the second rubber connection tube 300b, and the protective tube 400 are prevented from being relatively displaced in the axial direction of the power cable 100. Can do.

(4) Modified Example of Second Embodiment The above-described embodiment can be changed as in the following modified example as necessary. Hereinafter, like the modification of the first embodiment, only elements different from those of the second embodiment will be described.

(4-1) Modification 1 of the second embodiment
A cable connection structure 12 according to Modification 1 of the present embodiment will be described with reference to FIG. FIG.5 (b) is sectional drawing which shows the cable connection structure which concerns on the modification 1 of this embodiment.

  The cable connection structure 12 of the first modification of the present embodiment is different from the above-described embodiment in that a plurality of connection fixing portions 20 are provided.

(Cable connection structure)
As shown in FIG. 5 (b), in the cable connection structure 12 of the first modification of the present embodiment, the connecting and fixing portion 20 sandwiches the first rubber connection tube 300a, the insertion cable 100c, and the second rubber connection tube 300b. A pair is provided. Specifically, the first connection fixing portion 21 connects and fixes the first power cable 100a and the protective tube 400. The second connection fixing part 22 connects and fixes the second power cable 100b and the protective tube 400.

(effect)
In the first modification of the present embodiment, the coupling fixing portion 20 is provided in a pair with the first rubber connection tube 300a, the interrupt cable 100c, and the second rubber connection tube 300b interposed therebetween, so that the interrupt cable 100c is sandwiched. When the axial force difference is generated between the pair of power cables 100, the movement in the axial direction due to the expansion and contraction in the axial direction of the one power cable 100 is changed to the first rubber connecting tube 300a, the insertion cable 100c and the first cable. It can be surely restricted by either one of the connecting and fixing portions 20 on both sides of the rubber connecting cylinder 300b. Thereby, it can suppress that the expansion-contraction force of the axial direction of one power cable 100 is applied to the conductor connection pipe | tube 200 which connects the conductors 110, and the interruption cable 100c interposed in the middle. As a result, even if an axial force difference is generated between the pair of power cables 100 with the interrupt cable 100c interposed therebetween, the first conductor connecting tube 200a and the first rubber connecting tube 300a are connected to the shaft of the power cable 100. The relative displacement in the direction and the relative displacement in the axial direction of the power cable 100 between the second conductor connection tube 200b and the second rubber connection tube 300b can be reliably suppressed.

(4-2) Modification 2 of the second embodiment
A cable connection structure 12 according to Modification 2 of the present embodiment will be described with reference to FIG. Fig.6 (a) is sectional drawing which shows the cable connection structure which concerns on the modification 2 of this embodiment.

  In the cable connection structure 12 of the second modification of the present embodiment, more coupling fixing portions 20 are provided than in the first modification.

(Cable connection structure)
As shown in FIG. 6A, in the cable connection structure 12 of the second modification of the present embodiment, the connecting and fixing portion 20 is inside the protective tube 400, and the first rubber connection cylinder 300a and the second rubber connection cylinder 300b. Three are provided outside in the axial direction. Specifically, the first connection fixing portion 21 connects and fixes the first power cable 100a and the protective tube 400. The second connection fixing part 22 connects and fixes the second power cable 100b and the protective tube 400. Further, the central connection fixing portion (third connection fixing portion) 23 connects and fixes the interrupt cable 100 c and the protective tube 400.

(Manufacturing method of cable connection structure)
In the protective tube arrangement step, the first power cable 100a and the protective tube 400 are connected and fixed by the first connecting and fixing portion 21, and the interrupt cable 100c and the protective tube 400 are connected and fixed by the central connecting and fixing portion 23. Then, the second power cable 100b and the protective tube 400 may be connected and fixed by the second connection fixing portion 22 in order.

(effect)
(A) In the second modification of the present embodiment, the central connecting and fixing portion 23 is provided inside the protective tube 400 and outside in the axial direction of the first rubber connecting tube 300a and the second rubber connecting tube 300b. And the protective tube 400 are connected and fixed, so that when the interruption cable 100c expands and contracts relative to the first power cable 100a and the second power cable 100b in the axial direction, the shaft of the interruption cable 100c The movement in the direction can be directly restricted by the central connection fixing portion 23. As a result, even when an axial force difference is caused due to the interrupt cable 100c, the power cable group, the first rubber connection tube 300a, the second rubber connection tube 300b, and the protective tube 400 are connected to the power cable 100. Relative displacement in the axial direction can be suppressed.

(B) In the modification 2 of this embodiment, the power cable 100 can be fixed most heavily in the cable connection structure 12 in which the interrupt cable 100c is interposed. That is, the connection fixing portions 20 are provided on both sides of the first rubber connection cylinder 300a and on both sides of the second rubber connection cylinder 300b, so that the first power cable 100a, the second power cable 100b, and The movement in the axial direction due to the expansion and contraction in the axial direction of each of the interrupt cables 100 c can be always restricted by any one of the connecting and fixing portions 20. Thereby, it can suppress that the expansion-contraction force of each axial direction of the 1st power cable 100a, the 2nd power cable 100b, and the interruption cable 100c is applied to the conductor connection pipe | tube 200 which connects the conductors 110 mutually. . As a result, when an axial force difference is generated between the pair of power cables 100 across the interrupt cable 100c, or the interrupt cable 100c is relatively axially relative to the first power cable 100a and the second power cable 100b. The first conductor connecting tube 200a and the first rubber connecting tube 300a are relatively displaced in the axial direction of the power cable 100, or the second conductor connecting tube 200b and the second rubber connecting tube can be expanded or contracted. It is possible to reliably suppress the relative displacement of 300b from the axial direction of the power cable 100.

(4-3) Modification 3 of the second embodiment
A cable connection structure 12 according to Modification 3 of the present embodiment will be described with reference to FIG. FIG.6 (b) is sectional drawing which shows the cable connection structure which concerns on the modification 3 of this embodiment.

  In the cable connection structure 12 of the third modification of the present embodiment, the position of the coupling fixing portion 20 is different from that of the above-described embodiment.

(Cable connection structure)
As shown in FIG. 6B, in the cable connection structure 12 of the third modification of the present embodiment, only the central connection fixing portion 23 is provided as the connection fixing portion 20. That is, the central connection fixing portion 23 connects and fixes the interrupt cable 100c and the protection tube 400 inside the protection tube 400 and outside the first rubber connection tube 300a and the second rubber connection tube 300b in the axial direction. Yes. On the other hand, the connecting and fixing portion 20 is not provided on the side opposite to the interrupt cable 100c with the first rubber connection cylinder 300a interposed therebetween or on the side opposite to the interrupt cable 100c with the second rubber connection cylinder 300b interposed therebetween.

(Manufacturing method of cable connection structure)
The present embodiment is the same as the above-described embodiment except that the interrupt cable 100c and the protective tube 400 are connected and fixed by the central connecting and fixing portion 23 in the protective tube arrangement step.

(effect)
(A) According to the modification of the present embodiment, the movement in the axial direction due to the expansion and contraction in the axial direction of the power cable 100 can be sufficiently restricted only by the central coupling fixing portion 23.

  Specifically, when the first power cable 100a expands and contracts relative to the second power cable 100b in the axial direction, the expansion and contraction force in the axial direction of the first power cable 100a causes the first conductor connecting pipe 200a and the splitting force. It is transmitted to the central connection fixing part 23 via a part of the incoming cable 100c. Thereby, the movement of the first power cable 100a in the axial direction can be indirectly restricted by the central coupling fixing portion 23. Even when the second power cable 100b expands and contracts relative to the first power cable 100a in the axial direction, the movement of the second power cable 100b in the axial direction is indirectly caused by the central connection fixing portion 23 as described above. Can be regulated. When the interruption cable 100c expands and contracts relative to the first power cable 100a and the second power cable 100b in the axial direction, the movement of the interruption cable 100c in the axial direction is directly caused by the central connection fixing portion 23. Can be suppressed.

  As described above, even when an axial force difference is generated between the pair of power cables 100 with the interrupt cable 100c interposed therebetween, or even when an axial force difference is generated due to the interrupt cable 100c, the central connection fixing is performed. Only the portion 23 can prevent the power cable group, the first rubber connecting tube 300a, the second rubber connecting tube 300b, and the protective tube 400 from being relatively displaced in the axial direction of the power cable 100.

(B) In the cable connection structure 12 in which the interruption cable 100c is interposed, only the central connection fixing portion 23 is provided on the interruption cable 100c, while the first rubber connection cylinder 300a is sandwiched between the opposite side of the interruption cable 100c. In addition, the connecting and fixing portion 20 is not provided on the opposite side of the insertion cable 100c with the second rubber connecting cylinder 300b interposed therebetween. Thereby, the said cable connection structure 12 can be reduced in size, controlling the movement of the axial direction resulting from the expansion-contraction of the power cable 100 by the axial direction by the center connection fixing | fixed part 23. FIG. For example, the size of the cable connection structure 12 of the present modification can be made equal to the size of a conventional cable connection structure in which an interruption cable is interposed without providing a connection fixing portion. Therefore, if a space sufficient to allow the insertion cable 100c to be interposed in the manhole can be secured, the bending radius of the power cable 100 is prevented from becoming excessively small at the offset portions on both sides of the cable connection structure 12. be able to.

(C) Since the central connection fixing portion 23 is provided at the center in the axial direction of the power cable 100 in the cable connection structure 12, the axial force difference between the pair of power cables 100 with the interrupt cable 100 c interposed therebetween. When this occurs, the central connection fixing portion 23 can regulate the movement in the axial direction due to the expansion and contraction in the axial direction of the pair of power cables 100 in a well-balanced manner without being biased to only one of the power cables 100. it can.

<Other Embodiments of the Present Invention>
As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, It can change variously in the range which does not deviate from the summary.

  In the above-described embodiment, the case where the connection fixing portion 20 includes the connection plate portion 560 that connects the inner flange portion 440 of the protective tube 400 and the clamp peripheral flange portion 540 of the clamp 520 by fastening bolts or the like will be described. However, if the connection fixing part 20 can connect and fix the predetermined power cable 100 and the protective tube 400, the connection fixing part 20 is not limited to the above-described configuration. For example, the connection fixing unit 20 may include a clamp 520 and a clamp peripheral flange 540, and a pair of flange portions 420 of the protective tube 400 may sandwich the clamp peripheral flange 540. Thereby, the movement of the clamp peripheral flange part 540 in the axial direction of the power cable 100 can be surely restricted by clamping the pair of flange parts 420. In addition, the clamp peripheral flange 540 can be fixed to the protective tube 400 regardless of screw fastening such as bolts.

  In the above-described embodiment, the inner flange portion 440 of the protective tube 400 is provided so as to surround the inner periphery of the protective tube 400, the clamp peripheral flange portion 540 is provided so as to surround the outer periphery of the clamp 520, and these are the connecting plate portions. Although the case where it is connected via 560 has been described, the inner flange portion of the protective tube 400 is provided along the axial direction of the power cable, and the clamp flange portion is provided along the axial direction of the power cable. It may be connected via a connecting plate part. Thereby, the movement of the axial direction resulting from the expansion-contraction of the axial direction of an electric power cable can be firmly controlled.

  In the above-described embodiment, the case where the connecting plate portion 560 that connects the inner flange portion 440 of the protective tube 400 and the clamp peripheral flange portion 540 of the clamp 520 is provided as a separate member has been described. At least one of the inner flange portion and the clamp circumferential flange portion of the clamp may also serve as a connecting plate portion. Thereby, the fastening location of a volt | bolt can be reduced and construction in the field can be made easier. However, when the inner flange portion of the protective tube also serves as the connecting plate portion, the inner flange portion may interfere with the power cable when the protective tube is allowed to escape to the power cable. For this reason, it is more preferable that the clamp periphery part of the clamp which does not need to escape to an electric power cable also serves as a connection board part.

  In the first embodiment and the second embodiment described above, the case where the connection fixing portion 20 is provided for the first power cable 100a has been described. However, the connection fixing portion 20 is provided for the second power cable 100b. It may be done.

  In the second modification of the second embodiment described above, the case where the connection fixing portion 20 is provided for each of the first power cable 100a, the second power cable 100b, and the interrupt cable 100c has been described. The unit 20 may not be provided for either the first power cable 100a or the second power cable 100b.

  In the above-described embodiment, the case where the connecting plate portion 560 does not have an opening other than the bolt insertion hole is illustrated, but the connecting plate portion 560 may have an opening through which the filler 480 can flow. Good. Thereby, in the filler filling process, the filler 480 can be easily filled on both sides of the connecting plate portion 560.

<Preferred embodiment of the present invention>
Hereinafter, preferred embodiments of the present invention will be additionally described.

(Appendix 1)
A pair of power cables, each having a conductor in the center, and abutting each other with the axes of the conductors aligned,
A conductor connection tube for compressively connecting the conductors of the pair of power cables;
A rubber connection tube fitted over the conductor connection tube and a part of each of the pair of power cables;
A protective tube provided so as to cover the rubber connection cylinder and a part of each of the pair of power cables;
A filler filled between the rubber connecting tube and the protective tube;
A connecting and fixing portion for connecting and fixing at least one of the pair of power cables and the protecting tube on the inner side of the protecting tube and on the outer side in the axial direction of the rubber connecting cylinder;
Cable connection structure having.

(Appendix 2)
The cable connection structure according to appendix 1, wherein the connection fixing portion is provided as a pair with the rubber connection cylinder interposed therebetween.

(Appendix 3)
A first power cable and a second power cable each having a conductor in the center;
A conductor at the center, interposed between the first power cable and the second power cable, with the axes of the conductors aligned with each of the first power cable and the second power cable; An interrupt cable to be matched,
A first conductor connecting pipe that compressively connects the conductors of the first power cable and the interrupt cable;
A first rubber connection tube fitted over the first conductor connection pipe, a part of the first power cable, and a part of the interrupt cable;
A second conductor connecting pipe for compressively connecting the conductors of the second power cable and the interrupt cable;
A second rubber connection tube fitted over the second conductor connection pipe, a part of the second power cable and a part of the interrupt cable,
A protective tube provided to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
A filler filled between the first rubber connection tube and the second rubber connection tube and the protective tube;
Connecting at least one of the first power cable and the second power cable and the protection tube inside the protection tube and outside in the axial direction of the first rubber connection tube and the second rubber connection tube A connecting fixing part to be fixed;
Cable connection structure having.

(Appendix 4)
The additional fixing 3 which further has a connection fixing | fixed part which connects and fixes the said insertion cable and the said protection tube inside the said protection tube and the axial direction outer side of the said 1st rubber connection cylinder and the said 2nd rubber connection cylinder. Cable connection structure.

(Appendix 5)
The cable connection structure according to appendix 3 or 4, wherein the connection fixing portion is provided as a pair with the first rubber connection tube, the insertion cable, and the second rubber connection tube interposed therebetween.

(Appendix 6)
A first power cable and a second power cable each having a conductor in the center;
A conductor at the center, interposed between the first power cable and the second power cable, with the axes of the conductors aligned with each of the first power cable and the second power cable; An interrupt cable to be matched,
A first conductor connecting pipe that compressively connects the conductors of the first power cable and the interrupt cable;
A first rubber connection tube fitted around the first conductor connection pipe, a part of the first power cable, and a part of the interrupt cable;
A second conductor connecting pipe for compressively connecting the conductors of the second power cable and the interrupt cable;
A second rubber connection tube fitted over the second conductor connection pipe, a part of the second power cable and a part of the interrupt cable,
A protective tube provided to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
A filler filled between the first rubber connection tube and the second rubber connection tube and the protective tube;
A connecting and fixing portion for connecting and fixing the insertion cable and the protecting tube on the inner side of the protecting tube and on the outer side in the axial direction of the first rubber connecting tube and the second rubber connecting tube;
Cable connection structure having.

(Appendix 7)
The connection fixing part is
A clamp for gripping at least one of the pair of power cables;
A connecting plate portion for connecting the protective tube and the clamp;
The cable connection structure according to any one of supplementary notes 1 to 6, having the following.

(Appendix 8)
The protective tube has an inner flange extending radially inward,
The cable connection structure according to appendix 7, wherein the connecting plate portion connects the inner flange portion and the clamp.

(Appendix 9)
The protective tube has a pair of flange portions, and is divided in the axial direction through the pair of flange portions,
The connection fixing part is
A clamp for gripping at least one of the pair of power cables;
A clamp peripheral flange provided to surround the outer periphery of the clamp, and extending radially outward from the outer periphery of the clamp;
Have
7. The cable connection structure according to any one of appendices 1 to 6, wherein the pair of flange portions of the protective tube sandwich the clamp peripheral portion.

(Appendix 10)
The connection fixing portion is interposed between at least one of the pair of power cables and the clamp, and has a cushion layer that absorbs radial expansion of the power cable. Cable connection structure described in 1.

(Appendix 11)
The cable connection structure according to appendix 10, wherein the cushion layer has semiconductivity.

(Appendix 12)
The cable connection structure according to Supplementary Note 10 or 11, wherein the clamp has irregularities on at least the cushion layer side.

(Appendix 13)
A pair of power cables each having a conductor in the center, with the axes of the conductors matching each other,
A step of compressively connecting the conductors of the pair of power cables with a conductor connecting pipe;
A step of externally fitting a rubber connection tube so as to cover the conductor connection tube and a part of each of the pair of power cables;
Providing a protective tube so as to cover the rubber connecting cylinder and a part of each of the pair of power cables;
Filling a filler between the rubber connecting tube and the protective tube;
Have
In the step of providing the protective tube,
A manufacturing method of a cable connection structure in which at least one of the pair of power cables and the protection tube are connected and fixed by a connection fixing portion inside the protection tube and outside the rubber connecting cylinder in the axial direction.

(Appendix 14)
Preparing a first power cable, a second power cable and an interrupt cable each having a conductor in the center;
The interrupt cable is interposed between the first power cable and the second power cable, and each of the first power cable and the second power cable and the interrupt cable are arranged on the axis of the conductor. Matching and matching,
Compressing and connecting the conductors of the first power cable and the interrupt cable with a first conductor connecting pipe;
Compressing and connecting the conductors of the second power cable and the interruption cable with a second conductor connecting pipe;
A step of externally fitting a first rubber connection tube so as to cover the first conductor connection tube, a part of the first power cable, and a part of the interruption cable;
A step of externally fitting a second rubber connection tube so as to cover the second conductor connection pipe, a part of the second power cable and a part of the interruption cable;
Providing a protective tube so as to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
Filling a filler between the first rubber connection tube and the second rubber connection tube and the protective tube;
Have
In the step of providing the protective tube,
Connecting at least one of the first power cable and the second power cable and the protection tube inside the protection tube and outside in the axial direction of the first rubber connection tube and the second rubber connection tube A method for manufacturing a cable connection structure in which a fixed portion is connected and fixed.

(Appendix 15)
Preparing a first power cable, a second power cable and an interrupt cable each having a conductor in the center;
The interrupt cable is interposed between the first power cable and the second power cable, and each of the first power cable and the second power cable and the interrupt cable are arranged on the axis of the conductor. Matching and matching,
Compressing and connecting the conductors of the first power cable and the interrupt cable with a first conductor connecting pipe;
Compressing and connecting the conductors of the second power cable and the interruption cable with a second conductor connecting pipe;
A step of externally fitting a first rubber connection tube so as to cover the first conductor connection tube, a part of the first power cable, and a part of the interruption cable;
A step of externally fitting a second rubber connection tube so as to cover the second conductor connection pipe, a part of the second power cable and a part of the interruption cable;
Providing a protective tube so as to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
Filling a filler between the first rubber connection tube and the second rubber connection tube and the protective tube;
Have
In the step of providing the protective tube,
A manufacturing method of a cable connection structure in which the interrupt cable and the protective tube are connected and fixed by a connecting and fixing portion inside the protective tube and outside in the axial direction of the first rubber connecting tube and the second rubber connecting tube. .

DESCRIPTION OF SYMBOLS 10, 12 Cable connection structure 20 Connection fixing | fixed part 21 1st connection fixing | fixed part 22 2nd connection fixing | fixed part 23 Center connection fixing | fixed part 100 Power cable 100a 1st power cable 100b 2nd power cable 100c Insertion cable 110 Conductor 130 Insulator 140 External semiconductive layer 160 Cushion tape 170 Metal sheath 180 Sheath 200 Conductor connecting tube 200a First conductor connecting tube 200b Second conductor connecting tube 280 Cover member 300 Rubber connecting tube 300a First rubber connecting tube 300b Second rubber connecting tube 320 Rubber unit Inner semiconductive layer 340 Rubber unit insulating layer 360 Stress cone portion 380 Rubber unit outer semiconductive layer 400 Protective tube 420 Flange portion 440 Inner flange 480 Filler 510 Cushion layer 520 Clamp 530 Half member 532 Clamp end flange 540 Clamp The flange portion 560 connecting plate portion

Claims (17)

A pair of power cables, each having a conductor in the center, and abutting each other with the axes of the conductors aligned,
A conductor connection tube for compressively connecting the conductors of the pair of power cables;
A rubber connection tube fitted over the conductor connection tube and a part of each of the pair of power cables;
A protective tube provided so as to cover the rubber connection cylinder and a part of each of the pair of power cables;
A filler filled between the rubber connecting tube and the protective tube;
A connecting and fixing portion for connecting and fixing at least one of the pair of power cables and the protecting tube on the inner side of the protecting tube and on the outer side in the axial direction of the rubber connecting cylinder;
Cable connection structure having. The cable connection structure according to claim 1, wherein a pair of the connection fixing portions are provided with the rubber connection cylinder interposed therebetween. The connection fixing part is
A clamp for gripping at least one of the pair of power cables;
A connecting plate portion for connecting the protective tube and the clamp;
The cable connection structure according to claim 1 or 2 , comprising: The cable connection structure according to claim 3 , wherein the connection fixing portion includes a cushion layer that is interposed between at least one of the pair of power cables and the clamp, and absorbs radial expansion of the power cable. . A first power cable and a second power cable each having a conductor in the center;
A conductor at the center, interposed between the first power cable and the second power cable, with the axes of the conductors aligned with each of the first power cable and the second power cable; An interrupt cable to be matched,
A first conductor connecting pipe that compressively connects the conductors of the first power cable and the interrupt cable;
A first rubber connection tube fitted over the first conductor connection pipe, a part of the first power cable, and a part of the interrupt cable;
A second conductor connecting pipe for compressively connecting the conductors of the second power cable and the interrupt cable;
A second rubber connection tube fitted over the second conductor connection pipe, a part of the second power cable and a part of the interrupt cable,
A protective tube provided to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
A filler filled between the first rubber connection tube and the second rubber connection tube and the protective tube;
Connecting at least one of the first power cable and the second power cable and the protection tube inside the protection tube and outside in the axial direction of the first rubber connection tube and the second rubber connection tube A connecting fixing part to be fixed;
Cable connection structure having. 6. The cable connection structure according to claim 5 , wherein the connection fixing portion is provided in a pair with the first rubber connection tube, the insertion cable, and the second rubber connection tube interposed therebetween. The connection fixing part is
A clamp that grips at least one of the first power cable and the second power cable;
A connecting plate portion for connecting the protective tube and the clamp;
Have
The cable connection structure according to claim 5 or 6. The connection fixing portion is interposed between at least one of the first power cable and the second power cable and the clamp, and is included in the first power cable and the second power cable held by the clamp. A cushion layer that absorbs at least any radial expansion of
The cable connection structure according to claim 7. Inside the protective tube, and axially outside of the first rubber connecting tube and the second rubber connecting tube, according to claim 5, further comprising a central connecting fixing portion for connecting and fixing said protection tube and said split incoming cable The cable connection structure of any one of -8 . A first power cable and a second power cable each having a conductor in the center;
A conductor at the center, interposed between the first power cable and the second power cable, with the axes of the conductors aligned with each of the first power cable and the second power cable; An interrupt cable to be matched,
A first conductor connecting pipe that compressively connects the conductors of the first power cable and the interrupt cable;
A first rubber connection tube fitted around the first conductor connection pipe, a part of the first power cable, and a part of the interrupt cable;
A second conductor connecting pipe for compressively connecting the conductors of the second power cable and the interrupt cable;
A second rubber connection tube fitted over the second conductor connection pipe, a part of the second power cable and a part of the interrupt cable,
A protective tube provided to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
A filler filled between the first rubber connection tube and the second rubber connection tube and the protective tube;
A central connection fixing portion for connecting and fixing the interrupt cable and the protection tube on the inner side of the protection tube and on the outer side in the axial direction of the first rubber connection tube and the second rubber connection tube;
Cable connection structure having. The central coupling fixing part is
A clamp for gripping the interrupt cable;
A connecting plate portion for connecting the protective tube and the clamp;
Have
The cable connection structure according to claim 9 or 10. The central coupling fixing part is interposed between the interrupt cable and the clamp, and has a cushion layer that absorbs radial expansion of the interrupt cable.
The cable connection structure according to claim 11. The cable connection structure according to any one of claims 4, 8, and 12 , wherein the clamp has irregularities on at least the cushion layer side. The protective tube has an inner flange extending radially inward,
The cable connection structure according to any one of claims 3, 4, 7, 8, 11, 12, and 13, wherein the connecting plate portion connects the inner flange portion and the clamp. A pair of power cables each having a conductor in the center, with the axes of the conductors matching each other,
A step of compressively connecting the conductors of the pair of power cables with a conductor connecting pipe;
A step of externally fitting a rubber connection tube so as to cover the conductor connection tube and a part of each of the pair of power cables;
Providing a protective tube so as to cover the rubber connecting cylinder and a part of each of the pair of power cables;
Filling a filler between the rubber connecting tube and the protective tube;
Have
In the step of providing the protective tube,
A manufacturing method of a cable connection structure in which at least one of the pair of power cables and the protection tube are connected and fixed by a connection fixing portion inside the protection tube and outside the rubber connecting cylinder in the axial direction. Preparing a first power cable, a second power cable and an interrupt cable each having a conductor in the center;
The interrupt cable is interposed between the first power cable and the second power cable, and each of the first power cable and the second power cable and the interrupt cable are arranged on the axis of the conductor. Matching and matching,
Compressing and connecting the conductors of the first power cable and the interrupt cable with a first conductor connecting pipe;
Compressing and connecting the conductors of the second power cable and the interruption cable with a second conductor connecting pipe;
A step of externally fitting a first rubber connection tube so as to cover the first conductor connection tube, a part of the first power cable, and a part of the interruption cable;
A step of externally fitting a second rubber connection tube so as to cover the second conductor connection pipe, a part of the second power cable and a part of the interruption cable;
Providing a protective tube so as to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
Filling a filler between the first rubber connection tube and the second rubber connection tube and the protective tube;
Have
In the step of providing the protective tube,
Connecting at least one of the first power cable and the second power cable and the protection tube inside the protection tube and outside in the axial direction of the first rubber connection tube and the second rubber connection tube A method for manufacturing a cable connection structure in which a fixed portion is connected and fixed. Preparing a first power cable, a second power cable and an interrupt cable each having a conductor in the center;
The interrupt cable is interposed between the first power cable and the second power cable, and each of the first power cable and the second power cable and the interrupt cable are arranged on the axis of the conductor. Matching and matching,
Compressing and connecting the conductors of the first power cable and the interrupt cable with a first conductor connecting pipe;
Compressing and connecting the conductors of the second power cable and the interruption cable with a second conductor connecting pipe;
A step of externally fitting a first rubber connection tube so as to cover the first conductor connection tube, a part of the first power cable, and a part of the interruption cable;
A step of externally fitting a second rubber connection tube so as to cover the second conductor connection pipe, a part of the second power cable and a part of the interruption cable;
Providing a protective tube so as to cover the first rubber connecting cylinder, the second rubber connecting cylinder, a part of the first power cable, the interrupt cable, and a part of the second power cable;
Filling a filler between the first rubber connection tube and the second rubber connection tube and the protective tube;
Have
In the step of providing the protective tube,
Manufacturing of a cable connection structure in which the insertion cable and the protective tube are connected and fixed by a central connection fixing portion inside the protective tube and outside in the axial direction of the first rubber connecting tube and the second rubber connecting tube. Method.

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