JP2019071738A - Cable connection structure and manufacturing method of the same - Google Patents

Abstract

To provide a technique capable of preventing a pair of power cables, a rubber connection tube, and a protective pipe from being relatively deviated to an axial direction of the power cable, even if an axial power difference occurs in the pair of power cables.SOLUTION: A cable connection structure includes: a pair of power cables that include conductors in respective centers and in which axes of the respective conductors are aligned and abutted with each other; a conductor connection pipe that compresses and connects the conductors of the pair of power cables; a rubber connection tube that is fitted to an outer side so as to cover a part of each of the conductor connection pipe and the pair of power cables; a protective pipe that is provided so as to cover a part of each of the rubber connection tube and the pair of power cables; a filling material that is filled into between the rubber connection tube and the protective pipe; and a coupling fixing part that couples and fixes the protective pipe with any one of the pair of power cables on an inner side of the protective pipe and an outer side in an axial direction of the rubber connection tube.SELECTED DRAWING: Figure 1

Description

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

  A cable connection structure may be provided in which the axes of the conductors coincide with each other to connect a pair of power cables (for example, Patent Document 1).

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

Unexamined-Japanese-Patent No. 2003-18738

  Here, if each of the pair of power cables is laid linearly from the pipeline to the manhole, and if the shape of the offset portion is equal on both sides of the cable connection structure, the axial direction of the power cable by thermal expansion and contraction of the power cable (Hereinafter referred to as axial force) can be offset on both sides of the cable connection structure.

  However, if only one of the pair of power cables is bent and laid from the pipeline toward the manhole, or if the shape of the offset portion differs on both sides of the cable connection structure, both sides of the cable connection structure There may be an axial force difference between the pair of power cables.

  An object of the present invention is that, even when an axial force difference occurs between a pair of power cables, the pair of power cables and the rubber connection cylinder and the protective tube are relatively shifted in the axial direction of the power cable To provide a technology capable of suppressing

According to one aspect of the invention:
A pair of power cables, each having a conductor in the center, but aligned with the axes of the conductors of each other and butted together;
A conductor connection pipe for compression-connecting the conductors of the pair of power cables;
A rubber connection tube externally fitted to the conductor connection tube and a part of each of the pair of power cables;
A protection pipe provided to cover a part of each of the rubber connection cylinder and the pair of power cables;
A filler filled between the rubber connection cylinder and the protective tube;
A connection / fixing portion for connecting and fixing at least one of the pair of power cables and the protection tube inside the protection tube and outside the axial direction of the rubber connection cylinder;
A cable connection structure is provided.

According to another aspect of the invention,
First and second power cables each having a conductor at its center,
A conductor is provided at the center, interposed between the first power cable and the second power cable, and the axes of the conductors are aligned with each other for each of the first power cable and the second power cable Butt cable,
A first conductor connection pipe for compressively connecting the conductors of the first power cable and the insertion cable;
A first rubber connection cylinder externally fitted to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
A second conductor connection pipe for compression-connecting the conductors of the second power cable and the insertion cable;
A second rubber connection cylinder externally fitted to the second conductor connection pipe, a part of the second power cable, and a part of the insertion cable;
A protective pipe provided to cover the first rubber connection cylinder, the second rubber connection cylinder, a part of the first power cable, the insertion cable, and a part of the second power cable;
A filler filled between the first and second rubber connection cylinders and the second rubber connection cylinder and the protective tube;
At least one of the first power cable and the second power cable is connected to the protective tube inside the protective tube and at the axial outer side of the first rubber connection cylinder and the second rubber connection cylinder Connection fixing part to fix,
A cable connection structure is provided.

According to yet another aspect of the invention,
First and second power cables each having a conductor at its center,
A conductor is provided at the center, interposed between the first power cable and the second power cable, and the axes of the conductors are aligned with each other for each of the first power cable and the second power cable Butt cable,
A first conductor connection pipe for compressively connecting the conductors of the first power cable and the insertion cable;
A first rubber connection cylinder externally fitted to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
A second conductor connection pipe for compression-connecting the conductors of the second power cable and the insertion cable;
A second rubber connection cylinder externally fitted to the second conductor connection pipe, a part of the second power cable, and a part of the insertion cable;
A protective pipe provided to cover the first rubber connection cylinder, the second rubber connection cylinder, a part of the first power cable, the insertion cable, and a part of the second power cable;
A filler filled between the first and second rubber connection cylinders and the second rubber connection cylinder and the protective tube;
A connection / fixing portion for connecting and fixing the insert cable and the protection pipe inside the protection pipe and outside the axial direction of the first rubber connection cylinder and the second rubber connection cylinder;
A cable connection structure is provided.

According to yet another aspect of the invention,
Butting a pair of power cables, each having a conductor at its center, with the axes of the conductors in alignment with one another;
Compression connecting the conductors of the pair of power cables with a conductor connection pipe;
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 connection cylinder and the pair of power cables;
Filling a filler between the rubber connection cylinder and the protective tube;
Have
In the process of providing the protective tube,
A method of manufacturing a cable connection structure is provided, in which at least one of the pair of power cables and the protective tube are connected and fixed by the connection fixing portion inside the protective tube and at the axial outer side of the rubber connection cylinder. .

According to yet another aspect of the invention,
Providing a first power cable, a second power cable and an insertion cable, each having a conductor at its center,
The insertion 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 insertion cable have axes of the conductors of each other. Matching and matching steps;
Compressively connecting the conductors of the first power cable and the insertion cable with a first conductor connection pipe;
Compressively connecting the conductors of the second power cable and the insert cable with a second conductor connection pipe;
Fitting the first rubber connection cylinder so as to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
Fitting a second rubber connection cylinder so as to cover the second conductor connection pipe, a part of the second power cable and a part of the insertion cable;
Providing a protective pipe to cover the first rubber connection cylinder, the second rubber connection cylinder, a portion of the first power cable, the insertion cable, and a portion of the second power cable;
Filling a filler between the first rubber connection cylinder and the second rubber connection cylinder and the protective pipe;
In the process of providing the protective tube,
At least one of the first power cable and the second power cable is connected to the protective tube inside the protective tube and at the axial outer side of the first rubber connection cylinder and the second rubber connection cylinder The manufacturing method of the cable connection structure linkedly fixed by the fixing part is provided.

According to yet another aspect of the invention,
Providing a first power cable, a second power cable and an insertion cable, each having a conductor at its center,
The insertion 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 insertion cable have axes of the conductors of each other. Matching and matching steps;
Compressively connecting the conductors of the first power cable and the insertion cable with a first conductor connection pipe;
Compressively connecting the conductors of the second power cable and the insert cable with a second conductor connection pipe;
Fitting the first rubber connection cylinder so as to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
Fitting a second rubber connection cylinder so as to cover the second conductor connection pipe, a part of the second power cable and a part of the insertion cable;
Providing a protective pipe to cover the first rubber connection cylinder, the second rubber connection cylinder, a portion of the first power cable, the insertion cable, and a portion of the second power cable;
Filling a filler between the first rubber connection cylinder and the second rubber connection cylinder and the protective pipe;
In the process of providing the protective tube,
A manufacturing method of a cable connection structure in which the insert cable and the protective tube are connected and fixed by the connection fixing portion inside the protective tube and at the axial direction outer side of the first rubber connection cylinder and the second rubber connection cylinder. Is provided.

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

It is the front view and sectional view showing the cable connection structure concerning a 1st embodiment of the present invention. (A) is an axial sectional view of a power cable which expanded a connection fixed part, and (b) is an A-A 'line sectional view 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 concerning the modification 2 of 1st Embodiment of this invention was expanded. (A) is a cross-sectional view showing a cable connection structure according to a second embodiment of the present invention, and (b) is a cross-sectional view showing a cable connection structure according to a first modification of the second embodiment of the present 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.

<Findings Obtained by Inventors>
First, the knowledge obtained by the inventors etc. will be described.

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

  The prefabricated type cable connection structure includes, for example, a conductor connection pipe, an epoxy unit, a pre-molded insulator, a pressing mechanism, and a protective pipe. The conductor connection pipe compresses and connects the conductors of the pair of power cables. The epoxy unit integrally has a shield electrode. The shield electrode is connected to the conductor connection tube. A pre-molded insulator is provided to cover the outer periphery of a portion of the stepped power cable. The pressing mechanism is configured to press the pre-molded insulator against the epoxy unit. Protective tubes are provided to cover them. In addition, a protective tube is fixed to a support stand etc., for example.

  In the prefabricated type 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 a pair of power cables on both sides of the cable connection structure. The relative displacement between the pair of power cables and the epoxy unit in the axial direction of the power cables is suppressed.

  However, in the prefabricated type cable connection structure, the construction is complicated, which makes installation on the site difficult. Further, in the prefabricated cable connection structure, the cost tends to be high because the number of parts is large.

  On the other hand, the type using a cold-shrinkable rubber connection cylinder has, for example, a conductor connection pipe, a rubber connection cylinder, a protective pipe, and a filler. The conductor connection pipe compresses and connects the conductors of a pair of power cables as in the prefabricated type. The rubber connection cylinder is externally fitted to cover the conductor connection tube and the like. Protective tubes are provided to cover them. The filler is filled between the rubber connection cylinder and the protective tube. The rubber connection cylinder and the protective tube are fixed to each other through the filler. In addition, a protective tube is fixed to a support stand etc., for example.

  In the type using a cold-shrinkable type rubber connection cylinder, the arrangement of the rubber connection cylinder can be completed simply by covering the rubber connection cylinder whose diameter is enlarged in advance with the outside of the conductor connection pipe. This makes it possible to improve the on-site workability.

  However, in the type using a cold-shrinkable type rubber connection cylinder, the pair of power cables and the rubber connection cylinder are fixed only by the contraction force and the frictional force of the rubber connection cylinder. Therefore, 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 the friction force of the rubber connection cylinder, the rubber connection cylinder is a filler and In contrast to being fixed to the support via the protective tube, the pair of power cables may be displaced relatively in the axial direction of the power cable. If the conductor connection pipe connecting the conductors of the pair of power cables and the rubber connection cylinder are relatively shifted, there is a possibility that the electric field distribution around the conductor connection pipe can not be safely maintained.

  As described above, conventionally, the cable connection structure of the prefabricated type and the cable connection structure of the type using the rubber connection cylinder of the normal temperature contraction type have the merits and demerits respectively. For this reason, the cable connection structure of a prefabricated type and the cable connection structure of a type using a cold-shrinkable rubber connection cylinder have been used depending on the place. That is, since the cable connection structure of prefabricated type is strong in the axial force difference but inferior in the workability, it is limited to the application to the place where the axial force difference is likely to occur between the pair of power cables. On the other hand, a cable connection structure of a type using a cold-shrinkable rubber connection cylinder is excellent in workability, but is weak to an axial force difference, so application to a place where an axial force difference does not occur between a pair of power cables It was limited to

  As described above, conventionally, the versatility of each type of cable connection structure is low, which causes an increase in the cost of the entire cable installation. Therefore, it has been desired to make the cable connection structure a common structure regardless of the place. That is, the cable connection structure which made compatible the tolerance to an axial force difference, and construction nature was desired.

  The present invention is based on the above-mentioned new subject found by the present inventors.

First Embodiment of the Present Invention
(1) Cable Connection Structure A cable connection structure according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view and a cross-sectional view showing a cable connection structure according to the present embodiment. Fig.2 (a) is an axial sectional view of the power cable which expanded the connection fixing | fixed part, (b) is an AA 'line sectional view of (a).

  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, a conductor connection pipe (compression sleeve) 200 and And a rubber connection cylinder (rubber unit, rubber block, pre-molded rubber insulator) 300, a protective pipe (copper pipe) 400, and a filler 480.

  In the following, the “axial direction” of the power cable 100 or the like means 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. The “radial direction” of the power cable 100 or the like means a direction perpendicular to the axial direction of the power cable 100 or the like, and in some cases can be reworded as the 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 crosslinked polyethylene insulated PVC sheathed cable, also referred to as an XLPE cable) which is a high voltage underground power transmission cable, and, for example, the conductor 110, an inner semiconductive layer (Not shown), insulator 130, outer semiconductive layer 140, cushion tape (pressing tape) 160, metal sheath (metal shielding layer, corrugated tube) 170, and sheath 180. The conductor 110 is configured by helically twisting a plurality of conductor strands (not shown). 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 in an 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 cover 170 are exposed in this order from one end side of the power cable 100.

  The power cable 100 is provided in a pair. The pair of power cables 100 are butted with the axes of the conductors 110 aligned with each other. Hereinafter, one of the pair of power cables 100 is referred to as "first power cable 100a", and the other is referred to as "second power cable 100b". In the case of simply saying "power cable 100", the first power cable 100a and the second power cable 100b are generically referred to. In addition, an insertion 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, made of copper). In the conductor connection pipe 200, the conductors 110 of the pair of power cables 100 abut each other. In this state, the conductor connection pipe 200 is radially compressed. Thus, the conductors 110 of the pair of power cables 100 are compression-connected by the conductor connection pipe 200.

  A metal (for example, aluminum alloy) cover member 280 is provided to cover the outer periphery of the conductor connection pipe 200. The cover member 280 is configured of, for example, a pair of half members (not shown). 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 cylinder)
The rubber connection cylinder 300 is configured as an insulating cylindrical member having a hollow portion penetrating in the axial direction, and is externally fitted to cover the conductor connection pipe 200 and a part of each of the pair of power cables 100. It is done.

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

  Further, the rubber connection cylinder 300 is configured to relieve the electric field around the conductor connection tube 200 while maintaining the insulation around the conductor connection tube 200. Specifically, the rubber connection cylinder 300 has, for example, a rubber unit inner semiconductive layer 320, a rubber unit insulating layer 340, a stress cone portion 360, and a rubber unit outer semiconductive layer 380.

  The rubber unit inner 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 inner semiconductive layer 320 is semiconductive, and includes, for example, ethylene propylene rubber or silicone rubber and carbon black. The rubber unit inner semiconductive layer 320 is at the same potential as the conductor connection pipe 200.

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

  The stress cones 360 are provided on both axial end sides of the rubber unit insulating layer 340. The stress cone portion 360 has a substantially tapered shape so that the diameter gradually separates from the inner peripheral surface of the rubber connection cylinder 300 in the direction from the both ends of the rubber connection cylinder 300 toward the center in the axial direction. It is provided. The stress cone portion 360 is semiconductive, and is made of, for example, the same material as the rubber unit inner semiconductive layer 320. A portion of the stress cone portion 360 that constitutes the inner circumferential surface of the rubber connection cylinder 300 is in contact with the outer semiconductive layer 140 of the power cable 100 that has been peeled off. With such a configuration of the stress cone portion 360, equipotential lines can be evenly distributed around the outer semiconductive layer 140, and electric field concentration can be suppressed.

  The rubber unit outer semiconductive layer 380 is provided to cover the outer periphery of the rubber unit insulating layer 340. The rubber unit outer semiconductive layer 380 is semiconductive, and is made of, for example, the same material as the rubber unit inner semiconductive layer 320. Thus, 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 cylinder 300.

(Protective pipe)
The protective tube 400 is provided to cover the rubber connection 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 whose diameter is expanded in the radial direction. Each of the pair of flanges 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 flanges 420. The pair of flanges 420 of the divided protective tube 400 are in contact with each other via a packing (not shown). Further, each of the pair of flanges 420 has a bolt insertion hole (not shown) at a position overlapping with each other. The protective tubes 400 are divided by fastening bolts (not shown) and nuts (not shown) inserted in the bolt insertion holes of the pair of flanges 420 with the pair of flanges 420 interposed therebetween. Is fixed.

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

  In the present embodiment, the protective tube 400 further includes an inner flange portion 440 extending inward in the radial direction of the protective tube 400 inside the radial direction of the flange portion 420. The inner flange portion 440 is provided, for example, to surround the inner periphery of the protective tube 400. The inner collar portion 440 has, for example, a plurality of screw holes (not shown) provided at predetermined intervals in the circumferential direction. The inner hook portion 440 will be described later in combination 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 insulation cylinder 620 is provided, for example, on the second power cable 100 b side of the protective tube 400 rather than the rubber connection cylinder 300.

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

  The axial ends of the protective tube 400 and the power cable 100 are sealed. Specifically, seal portions 640 are provided at both axial ends of the protective tube 400. The seal portion 640 is made of, for example, a sealing tape with an adhesive layer or a shrinkable sealing tube. This can suppress the infiltration of water into the protective tube 400.

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

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

(Filling material)
In the protective tube 400, the filler 480 is filled between the rubber connection cylinder 300 and the protective tube 400. This can suppress the infiltration of water into the protective tube 400. In addition, the filling material 480 filling the air gap in the protective tube 400 can suppress the formation of an air layer to be a thermal resistance in the protective tube 400. As a result, the heat dissipation from the power cable 100 to the outside can be improved.

  The filler 480 is formed, for example, by curing a resin composition having a predetermined fluidity at a predetermined temperature before curing. Thereby, the filler 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.

  As a resin composition which constitutes filler 480, for example, a two-component curable so-called waterproof mixture can be mentioned. The waterproof mixture is, for example, at least one of a urethane resin, an epoxy resin, and a silicone resin.

  By filling and curing the filler 480 in the protective tube 400, the rubber connection cylinder 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 via the filler 480 and the protective tube 400.

(Connection fixed part)
As shown in FIG. 1, the connection fixing portion 20 connects and fixes at least one of the pair of power cables 100 and the protection tube 400 inside the protection tube 400 and outside the axial direction of the rubber connection cylinder 300. There is. In the present embodiment, for example, only one connection fixing portion 20 is provided to connect and fix the first power cable 100 a and the protective tube 400. Thereby, when an axial force difference arises between a pair of power cables 100, the movement in the axial direction resulting from the expansion and contraction in the axial direction of the power cables 100 can be restricted by the connection fixing portion 20.

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

  The clamp 520 is configured, for example, as a metal cylindrical member having a hollow portion penetrating in the axial direction. The clamp 520 is, for example, provided so as to surround the outer periphery of at least one of the pair of power cables 100 and is configured to grip the power cable 100. In the present embodiment, the clamp 520 holds, for example, a portion of the first power cable 100a where the outer 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, for example, nonmagnetic metal, like the flange 420 of the protective tube 400. Specifically, the clamp 520 is made of, for example, brass. As a result, the thermal conductivity of the clamp 520 can be improved, and the heat generation of the clamp 520 itself due to electromagnetic induction can be suppressed.

  The clamp 520 includes, for example, a pair of half members 530. Each of the pair of half members 530 is configured, for example, by half-dividing the cylindrical member at a half plane along the axial direction. The pair of half members 530 form a hollow portion by making the concave portions (not shown) opposite each other to form a hollow portion, and the power cable 100 is sandwiched in the hollow portion.

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

  The clamp end flange portion 532 extends radially outward from the outer periphery of the half member 530 at each of both ends in the circumferential direction of the half member 530, for example, and is 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 bolt insertion holes (not shown) at positions overlapping with each other. A bolt (not shown) and a nut (not shown) which are inserted into the bolt insertion holes of the pair of clamp end flanges 532 are fastened with the pair of clamp end flanges 532 interposed therebetween. Split members 530 are fixed to each other.

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

  The cushion layer 510 is provided, for example, 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, for example, to cover the outer periphery of the first power cable 100a.

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

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

  The cushion layer 510 may have, for example, semiconductivity. Thereby, the surface where the outer 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. A metal shielding member such as the metal mesh tape or the metal protective tube 400 not only passes an accident current (ground current) when a ground fault occurs in the power cable 100, but also a sheath current (insulator) Charging current, current by electromagnetic induction). In such a configuration, as the cushion layer 510 is semiconductive, electrical connection can be established between the outer semiconductive layer 140 of the power cable 100 and the metal shielding member described above. In the case where the nominal voltage of power cable 100 is low, 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 greater than the restraining force with which the rubber connection cylinder 300 restrains the power cable 100, and furthermore, an axial force difference (power cable Preferably, it is greater than 100). The restraining force of the rubber connection cylinder 300 here depends on, for example, the elastic contraction force of the rubber connection cylinder 300 and the frictional force due to the contact of the rubber connection cylinder 300 and the power cable 100.

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

  The connection plate portion 560 is configured to, for example, connect the inner flange portion 440 of the protective tube 400 and the clamp 520 separately.

  Specifically, for example, two connection plate portions 560 are provided. Each of the two connection plate parts 560 has, for example, a semicircular arc fan shape, and is arranged to surround the outer periphery of the clamp 520. The radially inner diameter of the connecting plate portion 560 is, for example, equal to or slightly larger than the outer diameter of the clamp 520. Also, the outer diameter of the connecting plate portion 560 in the radial direction is, for example, equal to or slightly smaller than the inner diameter of the protective tube 400. The connecting plate portion 560 abuts on each of the clamp circumferential ridge portion 540 of the clamp 520 and the inner ridge portion 440 of the protective tube 400.

  In the present embodiment, for example, the connection plate portion 560 is in contact with the rubber connection cylinder 300 side of the inner flange portion 440 of the protective tube 400 and the rubber connection cylinder 300 side of the clamp peripheral flange portion 540 of the clamp 520. I am in touch. The arrangement of the connection plate portion 560 is not limited to the above configuration. For example, the connection plate portion 560 may be in contact with the rubber connection cylinder 300 side of the inner flange portion 440 and the opposite side of the clamp peripheral flange portion 540 with respect to the rubber connection cylinder 300 side. Alternatively, it may be in contact with the side opposite to the rubber connection cylinder 300 side of the inner collar portion 440 and the rubber connection cylinder 300 side of the clamp circumferential collar portion 540, or the inner collar portion 440 It may be in contact with the opposite side to the rubber connection cylinder 300 side and the opposite side to the rubber connection cylinder 300 side of the clamp circumferential flange portion 540. In the protective pipe arrangement step described later, the connection order may be changed according to the arrangement of the connection plate portion 560.

  The connection plate portion 560 has, for example, a plurality of bolt insertion holes (not shown) provided at predetermined intervals in the circumferential direction, respectively 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 the screw hole of the clamp peripheral flange portion 540. . On the other hand, for example, the connection plate portion 560 and the protective tube 400 are connected and fixed by screwing a bolt (not shown) inserted into the bolt insertion hole of the connection plate portion 560 into the screw hole of the inner flange portion 440. It is done.

  Further, the connection plate portion 560 is made of nonmagnetic metal, for example, like the flange portion 420 and the clamp 520 of the protective tube 400. Specifically, the connecting plate portion 560 is made of, for example, brass. Thus, the thermal conductivity of the connection plate portion 560 can be improved, and the heat generation of the connection plate portion 560 itself caused by the 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, 30 mm or more and 130 mm or less.

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

  The axial direction length of the clamp 520 which comprises the connection fixing | fixed part 20 is 200 mm or more and 800 mm or less, for example, and the internal diameter of the clamp 520 is 40 mm or more and 150 mm or less, for example.

  The axial length of the protective tube 400 is, for example, 800 mm or more and 3500 mm or less, and the outer diameter of the protective tube 400 is, for example, 130 mm or more and 320 mm or less.

(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, the pair of power cables 100, the conductor connection pipe 200, the rubber connection cylinder 300, and the protective pipe 400 that make up 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. Thereby, the diameter of the rubber connection cylinder 300 is expanded.

  Also, at this time, it is peeled off stepwise in the axial direction from one end of each of the pair of power cables 100. Thereby, the conductor 110, the insulator 130, the outer semiconductive layer 140, the cushion tape 160, and the metal cover 170 are exposed in this order from one end side of the power cable 100.

(Insertion process)
After preparing each member constituting the cable connection structure 10, each of the rubber connection cylinder 300 and the protection pipe 400 is passed through the power cable 100, and each of the rubber connection cylinder 300 and the protection pipe 400 is released to a predetermined position of the power cable 100. deep. Specifically, a part of the protective tube 400 having the inner flange portion 440 and the rubber connection cylinder 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)
After each of the rubber connection cylinder 300 and the protective tube 400 is passed through the power cable 100, the pair of power cables 100 are butted in the conductor connection tube 200 with the axes of the conductors 110 aligned with each other. When the pair of power cables 100 are butted, the conductors 110 of the pair of power cables 100 are compression connected by the conductor connection pipe 200. After the conductor connection pipe 200 is compression-connected, a cover member 280 is placed to cover the outer periphery of the conductor connection pipe 200.

(Rubber connection tube placement process)
When the compression connection process is completed, the rubber connection cylinder 300 is externally fitted to cover the conductor connection pipe 200 and a part of each of the pair of power cables 100. Specifically, the rubber connection cylinder 300 expanded in diameter by the inner core is moved from the position released to the first power cable 100 to the position overlapping the conductor connection pipe 200. When the rubber connection cylinder 300 is disposed at a predetermined position, the inner core ribbon is gradually loosened from one axial end of the rubber connection cylinder 300, and the diameter of the rubber connection cylinder 300 is gradually reduced in the axial direction. Thus, the rubber connection cylinder 300 can be externally fitted in close contact with parts of the conductor connection pipe 200 and the pair of power cables 100.

(Protective pipe placement process)
After the rubber connection cylinder 300 is disposed, the protective pipe 400 is provided to cover a part of each of the rubber connection 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 connection fixing portion 20 inside the protective tube 400 and at the axial outer side of the rubber connection cylinder 300.

  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 outer semiconductive layer 140 is exposed. After the cushion layer 510 is formed, hollow portions are formed by opposing the concave portions of the pair of half members 530 constituting the clamp 520, and the first power cable 100a is sandwiched in the hollow portions. When the first power cable 100a is sandwiched by the pair of half members 530, a 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 members 530 are fixed. As a result, the clamp 520 grips the first power cable 100a.

  When the first power cable 100a is gripped by the clamp 520, a 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 circumferential collar portion 540, thereby clamping the connection plate portion 560 and the clamp. Connect and fix 520. Next, the protective tube 400 having the inner flange 440 is moved from the position released to the first power cable 100 a to the position overlapping the clamp 520. Once the protective tube 400 is placed at a predetermined position, a 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 inner flange portion 440. Connect and fix.

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

  After the first power cable 100a and the protective tube 400 are connected and fixed by the connection fixing portion 20, the remaining protective tube 400 is arranged to cover a part of each of the rubber connection cylinder 300 and the pair of power cables 100. Once the protective tube 400 is disposed at a predetermined position, a bolt is inserted into the bolt insertion hole of the pair of flange portions 420, and the divided protective tube 400 is obtained by fastening the bolt and the nut with the pair of flange portions 420 interposed therebetween. Fix each other.

  When the protective tubes 400 are fixed to each other, the sealing portions 640 are formed on both axial ends of the protective tubes 400. Thereby, it is possible to seal between each of the axial ends of the protective tube 400 and the power cable 100.

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

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

(3) Effects of the Present Embodiment According to the present embodiment, one or more of the following effects can be obtained.

(A) In the present embodiment, the connection fixing portion 20 connects and fixes at least one of the pair of power cables 100 and the protection pipe 400 inside the protection pipe 400 and outside in the axial direction of the rubber connection cylinder 300. ing. Since the protective tube 400 is fixed to the support base, the power cable 100 provided with the connecting / fixed portion 20 of the pair of power cables can also be mounted on the support via the connecting / fixed portion 20 and the protective tube 400 (indirectly ) Will be fixed. Thereby, when an axial force difference arises between a pair of power cables 100, the movement in the axial direction resulting from the expansion and contraction in the axial direction of the power cables 100 can be restricted by the connection fixing portion 20.

  Specifically, when the first power cable 100a to which the connection fixing portion 20 is connected and fixed is expanded and contracted relatively to the second power cable 100b in the axial direction, movement of the first power cable 100a in the axial direction is It can be regulated directly by the connection 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, expands and contracts in the axial direction relative to the first power cable 100a, the axial expansion and contraction force of the second power cable 100b is the conductor. The connection fixing portion 20 is transmitted through the connection pipe 200 and a part of the first power cable 100a. Thus, axial movement of the second power cable 100b can be indirectly restricted by the connection fixing portion 20. As described above, even if an axial force difference occurs between the pair of power cables 100 by restricting the axial movement caused by the expansion and contraction of the power cable 100 in the axial direction by the connection fixing portion 20, Relative displacement of the pair of power cables 100 and the rubber connection cylinder 300 and the protective tube 400 in the axial direction of the power cable 100 can be suppressed. As a result, the electric field distribution around the conductor connection pipe 200 can be safely maintained.

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

  As described above, according to the present embodiment, it is possible to provide the cable connection structure 10 in which the resistance to the axial force difference and the workability are compatible. This makes it possible to make the cable connection structure 10 a common structure regardless of where the power cable 100 is laid.

(B) The connection fixing portion 20 grips a portion of the power cable 100 where the outer semiconductive layer 140 is exposed (that is, a cable core). Thus, the power cable 100 and the protective tube 400 can be firmly connected and fixed. In addition, the connection fixing portion 20 is accommodated inside the protective tube 400. Thereby, waterproofness of a portion of the power cable 100 where the outer semiconductive layer 140 is exposed and the connection fixing portion 20 for gripping the portion can be secured.

  In addition, since the connection fixing portion 20 is accommodated inside the protective tube 400, there is no projecting portion related to the connection fixing portion 20 outside the protective tube 400, and the external appearance of the cable connection structure 10 is a conventional cable. It is almost the same as the appearance of the connection structure. Thereby, it can suppress that the cable connection structure 10 whole becomes excessive resulting from having provided the connection fixing | fixed part 20. As shown in FIG.

(C) The protective pipe 400 is not movable, and is fixed to the support so that the relative positional relationship between the pair of power cables 100 and the rubber connection cylinder 300 and the protective pipe 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 an axial force difference occurs in the pair of power cables. The structure can be considered. In this case, when the protective tube is moved so as to reduce the difference in axial force between the pair of power cables, the power cable may be twisted in the spiral direction of the conductor. For this reason, there is a possibility that the protective tube which moved once may not return. As a result, the relative positional relationship between the pair of power cables and the rubber connection cylinder and the protective tube may be unstable.

  On the other hand, in the present embodiment, the protective tube 400 is fixed to the support, and the power cable 100 is also fixed to the support via the connection fixing portion 20 and the protective tube 400. Thus, even when an axial force difference occurs between the pair of power cables 100, twisting of the power cable 100 in the helically stranded direction of the conductor 110 can be suppressed. As a result, the relative positional relationship between the pair of power cables 100 and the rubber connection cylinder 300 and the protective tube 400 can be stably maintained.

(D) The protective tube 400 has an inner flange portion 440 extending radially inward. Further, the connection fixing portion 20 has a clamp 520 for gripping at least one of the pair of power cables 100, and a connection plate portion 560 for connecting the inner flange portion 440 and the clamp 520 by fastening a bolt 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 in the axial direction relative to the second power cable 100b, the first power cable 100a held by the clamp 520 is connected via the connection plate portion 560. Thus, the inner hook portion 440 of the protective tube 400 can be locked. On the other hand, when the second power cable 100b expands and contracts relatively in the axial direction with respect to the first power cable 100a, the second power cable 100b can be inserted into the The two power cables 100 b can be locked to the inner flange 440 of the protective tube 400. As a result, axial movement caused by expansion and contraction in the axial direction of the power cable 100 can be firmly restricted by the connection fixing portion 20. As a result, relative displacement between the pair of power cables 100 and the rubber connection cylinder 300 and the protective tube 400 in the axial direction of the power cable 100 can be reliably suppressed.

(E) The cushion layer 510 is interposed between at least one of the pair of power cables 100 and the clamp 520 to maintain the gripping force with which the clamp 520 grips the power cable 100. When the power cable 100 is radially expanded by energization, the expansion can be absorbed by the cushion layer 510. Thus, it is possible to simultaneously suppress the axial relative displacement of the pair of power cables 100 with respect to the rubber connection cylinder 300 and the protective tube 400 and to allow the radial expansion of the power cable 100. .

  In addition, the cushion layer 510 can be interposed between the power cable 100 and the clamp 520 in a soft manner by interposing the cushion layer 510 between at least one of the pair of power cables 100 and the clamp 520, and the clamp 520 The gripping force for gripping the cable 100 can be buffered. As a result, the power cable 100 can be prevented from being overloaded or traumatized due to the gripping of the clamp 520.

(4) Modification of First Embodiment The above-described embodiment can be modified as the modification shown below, as necessary. Hereinafter, only components different from the above-described embodiment will be described, and components substantially the same as the components described in the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.

(4-1) Modification 1 of the First Embodiment
The cable connection structure 10 which concerns on the modification 1 of this embodiment is demonstrated using FIG. FIG. 3 is a cross-sectional view showing a cable connection structure according to a modification 1 of the embodiment. In addition, FIG. 3 has simplified and shown the cable connection structure 10, and the structure of the lower half is abbreviate | omitted. The same applies to FIGS. 5 and 6 described later.

  In the cable connection structure 10 of the modification 1 of this embodiment, the point in which the connection fixing | fixed part 20 is provided with two or more differs from the above-mentioned embodiment.

(Cable connection structure)
As shown in FIG. 3, in the cable connection structure 10 according to the first modification of the embodiment, the connection fixing portion 20 is provided in a pair with the rubber connection cylinder 300 interposed therebetween. Specifically, among 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, the second connection fixing portion 22 of the pair of connection fixing portions 20 connects and fixes the second power cable 100 b 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 and The protective tube 400 is electrically connected via the second connection fixing portion 22. For this reason, the epoxy insulating cylinder 620 for trimming is, for example, between the first connection fixing portion 21 and the second connection fixing portion 22 (more specifically, the second connection fixing portion 22 and the rubber connection cylinder 300 It is preferable to be provided between). Thus, the protective pipe 400 connected and fixed to the first power cable 100 a via the first connection fixing portion 21 and the connection fixed to the second power cable 100 b via the second connection fixing portion 22 The protective tube 400 can be electrically separated.

(Method of manufacturing cable connection structure)
In the protective pipe arranging step, the first power cable 100 a and the protective pipe 400 are connected and fixed by the first connection fixing portion 21, and the second power cable 100 b and the protective pipe 400 are connected and fixed by the second connection fixing portion 22. You can do it in order.

(effect)
In the first modification of the present embodiment, when the connection fixing portion 20 is provided as a pair across the rubber connection cylinder 300, when an axial force difference occurs between the pair of power cables 100, that is, a pair of electric power When one of the cables 100 expands and contracts in the axial direction relative to the other, the axial movement caused by the expansion and contraction in the axial direction of one of the power cables 100 can be detected on both sides of the rubber connection cylinder 300. It can always be regulated by any of the connection fixing portions 20. Thereby, it can suppress that the expansion-contraction force of one electric power cable 100 is applied to the conductor connection pipe 200 which connects conductors 110 comrades. As a result, even when an axial force difference occurs between the pair of power cables 100, relative displacement between the conductor connection pipe 200 and the rubber connection cylinder 300 in the axial direction of the power cable 100 can be reliably suppressed. can do.

(4-2) Modification 2 of the first embodiment
The cable connection structure 10 which concerns on the modification 2 of this embodiment is demonstrated using FIG. FIG. 4 is an enlarged cross-sectional view of a clamp according to Modification 2 of the present embodiment.

  In the cable connection structure 10 of the modified example 2 of this embodiment, the configuration of the clamp 520 of the connection fixing portion 20 is different from that of the above-described embodiment.

(Connection fixed part)
As shown in FIG. 4, in the cable connection structure 10 according to the second modification of the present embodiment, the clamp 520 of the connection fixing portion 20 has, for example, unevenness at least on the cushion layer 510 side. In this modification, the inner circumferential surface and the outer circumferential surface of each of the pair of half members 530 constituting the clamp 520 have, for example, periodical irregularities in the circumferential direction. That is, in each of the pair of half members 530, concave portions relatively reduced in diameter and convex portions relatively enlarged in 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, for example, irregularities on the outer peripheral surface side as well as the inner peripheral surface side, but the outer peripheral surfaces of each 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 connection / fixing portion 20 has irregularities at least on the cushion layer 510 side, whereby the area in which the clamp 520 abuts on the cushion layer 510 can be increased. As a result, 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, the 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 will be shortened by the removed amount. For this reason, it is necessary to split a new power cable between the pair of remaining power cables so as to compensate for the removed power cable. Here, a power cable newly inserted is called, for example, an "inserted cable". Also in the cable connection structure in which the insert cable is inserted in this manner, the same connection fixing portion as that of the above-described first embodiment can be applied.

  Note that the cable connection structure in which the insert cable is inserted is not limited to the case of the above-mentioned accident recovery. The cable connection structure in which the insertion cable is inserted may be applied, for example, in the case where the connection portion such as system switching (route change) is disassembled and the power cable is reconnected. Also in the cable connection structure in such a case, the same connection fixing portion as that of the above-described first embodiment can be applied.

  The present embodiment differs from the first embodiment in that it has an insert cable 100c. Hereinafter, as in the modification of the first embodiment, only elements different from the first embodiment will be described.

(1) Cable Connection Structure A cable connection structure according to the second embodiment will be described with reference to FIG. 5 (a). Fig.5 (a) is sectional drawing which shows the cable connection structure which concerns on this embodiment.

  As shown to Fig.5 (a), the cable connection structure 12 of this embodiment is comprised so that a pair of electric power cable 100 may be connected linearly, interposing the insertion cable 100c, for example, the 1st electric power cable 100a. , Second power cable 100b, insert cable (relay cable, interpolation cable) 100c, first conductor connection pipe 200a, second conductor connection pipe 200b, first rubber connection cylinder 300a, and second rubber connection A cylinder 300 b, a protective pipe 400, a filler 480, and a connection / fixing portion 20 are provided.

(Cable cable)
The insert cable 100c is configured, for example, in the same manner as the cable core of the first power cable 100a and the like. That is, for example, from the center toward the outer periphery, the insert cable 100c includes the conductor 110, the inner semiconductive layer, the insulator 130, and the outer semiconductive layer 140 forming the outermost layer of the insert cable 100c. Have.

  The insert cable 100c is interposed between the first power cable 100a and the second power cable 100b. Further, the insert cable 100c is butted to each of the first power cable 100a and the second power cable 100b with the axes of the conductors 110 aligned with each other. Hereinafter, what the 1st power cable 100a, the 2nd power cable 100b, and the insert cable 100c connected in linear form may be called "power cable group."

  The axial length of the insert cable 100c in the present embodiment is, for example, the shortest length or longer at which the inner core ribbon for expanding the diameter of each of the first rubber connection cylinder 300a and the second rubber connection cylinder 300b can be released. It is. Specifically, the axial length of the insert cable 100c is, for example, 300 mm or more and 2000 mm or less.

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

(Rubber connection cylinder)
The first rubber connection cylinder 300a is externally fitted to cover the first conductor connection pipe 200a, a part of the first power cable 100a, and a part of the split cable 100c. The second rubber connection cylinder 300b is externally fitted to cover the second conductor connection pipe 200b, a part of the second power cable 100b, and a part of the split cable 100c.

(Protective pipe)
The protective tube 400 is provided to cover the first rubber connection cylinder 300a, the second rubber connection cylinder 300b, a part of the first power cable 100a, the insertion cable 100c, and a part of the second power cable 100b. Are configured to protect at once.

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

(Connection fixed part)
The connection fixing portion 20 of the present embodiment is an inner side of the protective tube 400 and an axial outer side of the first rubber connection cylinder 300a and the second rubber connection cylinder 300b, and among the first power cable 100a and the second power cable 100b. And at least one of them and the protective pipe 400 are connected and fixed. In the present embodiment, for example, only one connection fixing portion 20 is provided to connect and fix the first power cable 100 a and the protective tube 400.

(2) Method of Manufacturing Cable Connection Structure Next, a method of manufacturing the cable connection structure of the present embodiment will be described.

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

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

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

(Rubber connection tube placement process)
Next, the first rubber connection cylinder 300a is externally fitted to the first conductor connection pipe 200a, a part of the first power cable 100a, and the split cable 100c. In addition, the second rubber connection cylinder 300b is externally fitted to the second conductor connection pipe 200b, a part of the second power cable 100b, and a part of the split cable 100c.

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

(Filler filling process)
Next, in the protective pipe 400, a filler 480 is filled between the rubber connection cylinder 300 and the protective pipe 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 insert cable 100c is interposed between the first power cable 100a and the second power cable 100b, the connection fixing portion 20 is the inside of the protective pipe 400 and the first. The protective pipe 400 is connected and fixed to at least one of the first power cable 100a and the second power cable 100b outside the first rubber connection cylinder 300a and the second rubber connection cylinder 300b in the axial direction. Thereby, the axial movement caused by the expansion and contraction in the axial direction of the power cable 100 is restricted by the connection fixing portion 20 when, for example, an axial force difference occurs between the pair of power cables 100 across the index cable 100c. can do.

  Specifically, when the first power cable 100a to which the connection fixing portion 20 is connected and fixed is expanded and contracted relatively to the second power cable 100b in the axial direction, as in the first embodiment, the first power cable The axial movement of 100 a can be regulated directly by the connection 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, expands and contracts in the axial direction relative to the first power cable 100a, the expansion and contraction force of the second power cable 100b in the axial direction is The second conductor connection pipe 200b, the insertion cable 100c, the first conductor connection pipe 200a, and a part of the first power cable 100a are transmitted to the connection fixing portion 20. Thus, axial movement of the second power cable 100b can be indirectly restricted by the connection fixing portion 20. In addition, when the insert cable 100c expands and contracts in the axial direction relative to the first power cable 100a and the second power cable 100b, the axial expansion and contraction force of the insert cable 100c is equal to that of the first conductor connection pipe 200a and It is transmitted to the connection fixing portion 20 via a part of the first power cable 100a. Thereby, axial movement of the insert cable 100c can be indirectly restricted by the connection fixing portion 20.

  Thus, in the cable connection structure 12 in which the insert cable 100c is interposed, an axial force difference occurs between the pair of power cables 100 across the insert cable 100c, or the axial force is caused by the insert cable 100c. Even when a difference occurs, it is possible to suppress relative displacement of the power cable group and the first rubber connection cylinder 300a, the second rubber connection cylinder 300b, and the protective tube 400 in the axial direction of the power cable 100. Can.

(4) Modification of Second Embodiment The above-described embodiment can be modified as the modification shown below, as necessary. Hereinafter, as in the modification of the first embodiment, only the elements different from the second embodiment described above will be described.

(4-1) Modification 1 of the second embodiment
The cable connection structure 12 which concerns on the modification 1 of this embodiment is demonstrated using FIG.5 (b). FIG.5 (b) is sectional drawing which shows the cable connection structure which concerns on the modification 1 of this embodiment.

  In the cable connection structure 12 of the modification 1 of this embodiment, the point by which the connection fixing | fixed part 20 is provided with two or more differs from the above-mentioned embodiment.

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

(effect)
In the first modification of the present embodiment, the connection fixing portion 20 is provided in a pair on both sides of the first rubber connection cylinder 300a, the insertion cable 100c and the second rubber connection cylinder 300b, thereby sandwiching the insertion cable 100c. When an axial force difference occurs between the pair of power cables 100, the axial movement caused by the expansion and contraction of one power cable 100 in the axial direction is determined by the first rubber connection cylinder 300a, the insert cable 100c and the first It can always be regulated by either of the connection fixing portions 20 on both sides of the 2 rubber connection cylinder 300b. Thereby, it is possible to suppress that the axial expansion and contraction force of one power cable 100 is applied to the conductor connection pipe 200 connecting the conductors 110 and the insertion cable 100c interposed therebetween. As a result, even if there is an axial force difference between the pair of power cables 100 across the insert cable 100c, the first conductor connection pipe 200a and the first rubber connection cylinder 300a are the shafts of the power cable 100. Relative displacement in the direction or relative displacement between the second conductor connection pipe 200 b and the second rubber connection cylinder 300 b in the axial direction of the power cable 100 can be reliably suppressed.

(4-2) Modification 2 of the second embodiment
The cable connection structure 12 which concerns on the modification 2 of this embodiment is demonstrated using Fig.6 (a). FIG. 6A is a cross-sectional view showing a cable connection structure according to a second modification of the present embodiment.

  In the cable connection structure 12 of the second modification of the present embodiment, the connection fixing portion 20 is provided more than the first modification.

(Cable connection structure)
As shown to Fig.6 (a), in the cable connection structure 12 of the modification 2 of this embodiment, the connection fixing | fixed part 20 is the inner side of the protective tube 400, and the 1st rubber connecting cylinder 300a and the 2nd rubber connecting cylinder 300b. Three are provided on the outer side in the axial direction of. Specifically, the first connection fixing portion 21 connects and fixes the first power cable 100 a and the protective tube 400. The second connection fixing portion 22 connects and fixes the second power cable 100 b and the protective tube 400. Further, the central connection fixing portion (third connection fixing portion) 23 connects and fixes the insertion cable 100c and the protective pipe 400.

(Method of manufacturing cable connection structure)
In the protective pipe arranging step, the first power cable 100 a and the protective pipe 400 are connected and fixed by the first connection fixing portion 21, and the insert cable 100 c and the protective pipe 400 are connected and fixed by the central connection fixing portion 23. And connecting and fixing the second power cable 100b and the protective tube 400 by the second connection fixing portion 22 may be sequentially performed.

(effect)
(A) In the second modification of the present embodiment, the central connection fixing portion 23 is the insert cable 100c inside the protective tube 400 and outside in the axial direction of the first rubber connection cylinder 300a and the second rubber connection cylinder 300b. The axis of the insert cable 100c is extended when the insert cable 100c expands and contracts in the axial direction relative to the first power cable 100a and the second power cable 100b by connecting and fixing the pipe and the protective pipe 400. The movement of the direction can be regulated directly by the central connection fixing portion 23. As a result, even if an axial force difference occurs due to the insert cable 100c, the power cable group and the first rubber connection cylinder 300a, the second rubber connection cylinder 300b, and the protective tube 400 It is possible to suppress relative displacement in the axial direction.

(B) In the second modification of the present embodiment, the power cable 100 can be fixed to the thickest in the cable connection structure 12 in which the insert cable 100c is interposed. That is, the connection fixing portions 20 are respectively provided on both sides sandwiching the first rubber connection cylinder 300a and on both sides sandwiching the second rubber connection cylinder 300b, whereby the first power cable 100a, the second power cable 100b and the second power cable 100b The movement in the axial direction resulting from the expansion and contraction in the axial direction of the insert cable 100c can always be restricted by any one of the connection fixing portions 20 described above. Thereby, it can suppress that the expansion-contraction force of the axial direction of each of the 1st power cable 100a, the 2nd power cable 100b, and the insertion cable 100c is applied to the conductor connection pipe 200 which connects conductors 110 comrades. . As a result, when an axial force difference occurs between the pair of power cables 100 across the insert cable 100c, or the insert cable 100c is axially relative to the first power cable 100a and the second power cable 100b. In the case where the first conductor connection pipe 200a and the first rubber connection cylinder 300a are shifted relative to each other in the axial direction of the power cable 100, or the second conductor connection pipe 200b and the second rubber connection cylinder It can be reliably suppressed that relative displacement between 300b and 300b in the axial direction of the power cable 100 occurs.

(4-3) Modification 3 of the second embodiment
The cable connection structure 12 which concerns on the modification 3 of this embodiment is demonstrated using FIG.6 (b). 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 modification 3 of this embodiment, the position of the connection fixing portion 20 is different from that of the above-described embodiment.

(Cable connection structure)
As shown in FIG. 6 (b), 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 insert cable 100c and the protection pipe 400 inside the protection pipe 400 and outside the axial direction of the first rubber connection cylinder 300a and the second rubber connection cylinder 300b. There is. On the other hand, the connection fixing portion 20 is not provided on the opposite side to the insert cable 100c across the first rubber connection cylinder 300a or on the opposite side to the insert cable 100c across the second rubber connection cylinder 300b.

(Method of manufacturing cable connection structure)
The present embodiment is the same as the above-described embodiment except that the insert cable 100c and the protective pipe 400 are connected and fixed by the central connection fixing portion 23 in the protective pipe arranging step.

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

  Specifically, when the first power cable 100a expands and contracts in the axial direction relative to the second power cable 100b, the expansion and contraction force in the axial direction of the first power cable 100a corresponds to the first conductor connection pipe 200a and the split cable. It is transmitted to the central connection fixing portion 23 through a part of the incoming cable 100c. Thus, axial movement of the first power cable 100 a can be indirectly restricted by the central connection fixing portion 23. Even when the second power cable 100b axially expands and contracts relatively to the first power cable 100a, the axial movement of the second power cable 100b is indirectly made by the central connection fixing portion 23 as described above. It can be regulated. When the insert cable 100c expands and contracts in the axial direction relatively to the first power cable 100a and the second power cable 100b, the axial movement of the insert cable 100c is directly made by the central connection fixing portion 23. It can be suppressed.

  As described above, even if there is an axial force difference between the pair of power cables 100 sandwiching the insert cable 100c, or even if an axial force difference occurs due to the insert cable 100c, the central connection and fixation are performed. The power cable group and the first rubber connection cylinder 300 a, the second rubber connection cylinder 300 b, and the protective tube 400 can be prevented from being relatively shifted in the axial direction of the power cable 100 only by the portion 23.

(B) In the cable connection structure 12 in which the insert cable 100c is interposed, only the central connection fixing portion 23 is provided in the insert cable 100c, and on the other side, the opposite side to the insert cable 100c with the first rubber connection cylinder 300a interposed therebetween. Also, the connection fixing portion 20 is not provided on the opposite side to the index cable 100c with the second rubber connection cylinder 300b interposed therebetween. Thus, the cable connection structure 12 can be miniaturized while the axial movement caused by the expansion and contraction of the power cable 100 in the axial direction is restricted by the central connection fixing portion 23. For example, the size of the cable connection structure 12 of the present modified example can be made equal to the size of the conventional cable connection structure in which the insertion cable is interposed without providing the connection fixing portion. Therefore, if it is possible to secure a space for interposing insertion cable 100c in the manhole, it is suppressed that the bending radius of power cable 100 becomes excessively small at each offset portion on both sides of cable connection structure 12 be able to.

(C) The center connection fixing portion 23 is provided at the axial center of the power cable 100 in the cable connection structure 12 so that the axial force difference between the pair of power cables 100 across the index cable 100 c. In the case where a failure occurs, the central connection fixing portion 23 restricts axial movement caused by expansion and contraction in the axial direction of the pair of power cables 100 in a balanced manner without being biased to only one power cable 100. it can.

Another Embodiment 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 embodiment described above, the case where the connection fixing portion 20 includes the connection plate portion 560 which connects the inner flange portion 440 of the protective tube 400 and the clamp peripheral flange portion 540 of the clamp 520 by fastening with a bolt or the like is described. However, as long as the connection fixing portion 20 can connect and fix the predetermined power cable 100 and the protective tube 400, the connection fixing portion 20 is not limited to the above-described configuration. For example, the connection fixing portion 20 may have a clamp 520 and a clamp circumferential collar 540, and the pair of flanges 420 of the protective tube 400 may clamp the clamp circumferential collar 540. Thereby, the movement of the clamp circumferential flange portion 540 in the axial direction of the power cable 100 can be reliably restricted by the sandwiching of the pair of flange portions 420. Further, the clamp circumferential flange portion 540 can be fixed to the protective tube 400 without using screw fastening such as a bolt.

  In the embodiment described above, the inner flange 440 of the protective tube 400 is provided to surround the inner periphery of the protective tube 400, and the clamp circumferential flange 540 is provided to surround the outer periphery of the clamp 520, and these are connected plate Although the case where the connection is made via the 560 has been described, the inner ridges of the protective tube 400 are provided along the axial direction of the power cable, and the clamp ridges are provided along the axial direction of the power cable, It may be connected via a connecting plate part. Thereby, axial movement caused by axial expansion and contraction of the power cable can be firmly restricted.

  Although the above-mentioned embodiment demonstrated the case where the connecting plate part 560 which connects the inner collar part 440 of the protective pipe 400, and the clamp peripheral collar part 540 of the clamp 520 is provided as another member from these, the protective pipe At least one of the inner hook and the clamp circumferential hook of the clamp may double as the connecting plate. As a result, it is possible to reduce the number of bolt fastening points and to make the on-site installation easier. However, when the inner flange of the protective tube doubles as the connecting plate, there is a possibility that the inner flange interferes with the power cable when the protective tube is released to the power cable. For this reason, it is preferable that the clamp circumferential flange of the clamp which does not need to be released to the power cable also serves as the connection plate.

  Although the case where the connection fixing portion 20 is provided for the first power cable 100a has been described in the first and second embodiments described above, 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 connection fixing portion 20 is provided for each of the first power cable 100a, the second power cable 100b, and the insertion cable 100c. The portion 20 may not be provided for any one of the first power cable 100 a and the second power cable 100 b.

  Although the case where the connecting plate portion 560 has no opening other than the bolt insertion hole is illustrated in the above embodiment, the connecting plate portion 560 may have an opening through which the filler 480 can flow. Good. Thereby, in the filler filling step, the filler 480 can be easily filled on both sides of the connection plate portion 560.

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

(Supplementary Note 1)
A pair of power cables, each having a conductor in the center, but aligned with the axes of the conductors of each other and butted together;
A conductor connection pipe for compression-connecting the conductors of the pair of power cables;
A rubber connection tube externally fitted to the conductor connection tube and a portion of each of the pair of power cables;
A protective tube provided to cover the rubber connection cylinder and a part of each of the pair of power cables;
A filler filled between the rubber connection cylinder and the protective tube;
A connection / fixing portion for connecting and fixing at least one of the pair of power cables and the protection tube inside the protection tube and outside the axial direction of the rubber connection cylinder;
Cable connection structure with.

(Supplementary Note 2)
The cable connection structure according to claim 1, wherein the connection fixing portion is provided in a pair on both sides of the rubber connection cylinder.

(Supplementary Note 3)
First and second power cables each having a conductor at its center,
A conductor is provided at the center, interposed between the first power cable and the second power cable, and the axes of the conductors are aligned with each other for each of the first power cable and the second power cable Butt cable,
A first conductor connection pipe for compressively connecting the conductors of the first power cable and the insertion cable;
A first rubber connection cylinder externally fitted to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
A second conductor connection pipe for compression-connecting the conductors of the second power cable and the insertion cable;
A second rubber connection cylinder externally fitted to the second conductor connection pipe, a part of the second power cable, and a part of the insertion cable;
A protective pipe provided to cover the first rubber connection cylinder, the second rubber connection cylinder, a part of the first power cable, the insertion cable, and a part of the second power cable;
A filler filled between the first and second rubber connection cylinders and the second rubber connection cylinder and the protective tube;
At least one of the first power cable and the second power cable is connected to the protective tube inside the protective tube and at the axial outer side of the first rubber connection cylinder and the second rubber connection cylinder Connection fixing part to fix,
Cable connection structure with.

(Supplementary Note 4)
The connection fixing portion according to claim 3, further comprising: a connection fixing portion connecting and fixing the insert cable and the protection tube inside the protection tube and outside the axial direction of the first rubber connection cylinder and the second rubber connection cylinder. Cable connection structure.

(Supplementary Note 5)
The cable connection structure according to Additional remark 3 or 4, wherein the connection fixing portion is provided as a pair across the first rubber connection cylinder, the insertion cable, and the second rubber connection cylinder.

(Supplementary Note 6)
First and second power cables each having a conductor at its center,
A conductor is provided at the center, interposed between the first power cable and the second power cable, and the axes of the conductors are aligned with each other for each of the first power cable and the second power cable Butt cable,
A first conductor connection pipe for compressively connecting the conductors of the first power cable and the insertion cable;
A first rubber connection cylinder externally fitted to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
A second conductor connection pipe for compression-connecting the conductors of the second power cable and the insertion cable;
A second rubber connection cylinder externally fitted to the second conductor connection pipe, a part of the second power cable, and a part of the insertion cable;
A protective pipe provided to cover the first rubber connection cylinder, the second rubber connection cylinder, a part of the first power cable, the insertion cable, and a part of the second power cable;
A filler filled between the first and second rubber connection cylinders and the second rubber connection cylinder and the protective tube;
A connection / fixing portion for connecting and fixing the insert cable and the protection pipe inside the protection pipe and outside the axial direction of the first rubber connection cylinder and the second rubber connection cylinder;
Cable connection structure with.

(Appendix 7)
The connection fixing portion is
A clamp for gripping at least one of the pair of power cables;
A connecting plate portion connecting the protective tube and the clamp;
The cable connection structure according to any one of appendices 1 to 6, further comprising:

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

(Appendix 9)
The protective tube has a pair of flanges and is axially divided via the pair of flanges,
The connection fixing portion is
A clamp for gripping at least one of the pair of power cables;
A clamp circumferential flange provided so as to surround the outer periphery of the clamp and extending radially outward from the outer periphery of the clamp;
Have
The cable connection structure according to any one of appendices 1 to 6, wherein the pair of flanges of the protective pipe sandwich the clamp circumferential flange.

(Supplementary Note 10)
The said connection fixing part is interposed between at least any one of the pair of power cables and the clamp, and has a cushion layer which absorbs radial expansion of the power cables. Cable connection structure described in.

(Supplementary Note 11)
The cable connection structure according to claim 10, wherein the cushion layer is semiconductive.

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

(Supplementary Note 13)
Butting a pair of power cables, each having a conductor at its center, with the axes of the conductors in alignment with one another;
Compression connecting the conductors of the pair of power cables with a conductor connection pipe;
Externally fitting a rubber connection cylinder so as to cover the conductor connection pipe and a part of each of the pair of power cables;
Providing a protective tube to cover the rubber connection cylinder and a portion of each of the pair of power cables;
Filling a filler between the rubber connection cylinder and the protective tube;
Have
In the process of providing the protective tube,
A method of manufacturing a cable connection structure, in which at least one of the pair of power cables and the protective tube are connected and fixed by the connecting and fixing portion inside the protective tube and at the axial outer side of the rubber connection cylinder.

(Supplementary Note 14)
Providing a first power cable, a second power cable and an insertion cable, each having a conductor at its center,
The insertion 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 insertion cable have axes of the conductors of each other. Matching and matching steps;
Compressively connecting the conductors of the first power cable and the insertion cable with a first conductor connection pipe;
Compressively connecting the conductors of the second power cable and the insert cable with a second conductor connection pipe;
Fitting the first rubber connection cylinder so as to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
Fitting a second rubber connection cylinder so as to cover the second conductor connection pipe, a part of the second power cable and a part of the insertion cable;
Providing a protective pipe to cover the first rubber connection cylinder, the second rubber connection cylinder, a portion of the first power cable, the insertion cable, and a portion of the second power cable;
Filling a filler between the first rubber connection cylinder and the second rubber connection cylinder and the protective pipe;
Have
In the process of providing the protective tube,
At least one of the first power cable and the second power cable is connected to the protective tube inside the protective tube and at the axial outer side of the first rubber connection cylinder and the second rubber connection cylinder The manufacturing method of the cable connection structure linkedly fixed by a fixing | fixed part.

(Supplementary Note 15)
Providing a first power cable, a second power cable and an insertion cable, each having a conductor at its center,
The insertion 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 insertion cable have axes of the conductors of each other. Matching and matching steps;
Compressively connecting the conductors of the first power cable and the insertion cable with a first conductor connection pipe;
Compressively connecting the conductors of the second power cable and the insert cable with a second conductor connection pipe;
Fitting the first rubber connection cylinder so as to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
Fitting a second rubber connection cylinder so as to cover the second conductor connection pipe, a part of the second power cable and a part of the insertion cable;
Providing a protective pipe to cover the first rubber connection cylinder, the second rubber connection cylinder, a portion of the first power cable, the insertion cable, and a portion of the second power cable;
Filling a filler between the first rubber connection cylinder and the second rubber connection cylinder and the protective pipe;
Have
In the process of providing the protective tube,
A manufacturing method of a cable connection structure in which the insert cable and the protective tube are connected and fixed by the connection fixing portion inside the protective tube and at the axial direction outer side of the first rubber connection cylinder and the second rubber connection cylinder. .

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

Claims (13)

A pair of power cables, each having a conductor in the center, but aligned with the axes of the conductors of each other and butted together;
A conductor connection pipe for compression-connecting the conductors of the pair of power cables;
A rubber connection tube externally fitted to the conductor connection tube and a portion of each of the pair of power cables;
A protective tube provided to cover the rubber connection cylinder and a part of each of the pair of power cables;
A filler filled between the rubber connection cylinder and the protective tube;
A connection / fixing portion for connecting and fixing at least one of the pair of power cables and the protection tube inside the protection tube and outside the axial direction of the rubber connection cylinder;
Cable connection structure with. The cable connection structure according to claim 1, wherein the connection fixing portion is provided in a pair on both sides of the rubber connection cylinder. First and second power cables each having a conductor at its center,
A conductor is provided at the center, interposed between the first power cable and the second power cable, and the axes of the conductors are aligned with each other for each of the first power cable and the second power cable Butt cable,
A first conductor connection pipe for compressively connecting the conductors of the first power cable and the insertion cable;
A first rubber connection cylinder externally fitted to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
A second conductor connection pipe for compression-connecting the conductors of the second power cable and the insertion cable;
A second rubber connection cylinder externally fitted to the second conductor connection pipe, a part of the second power cable, and a part of the insertion cable;
A protective pipe provided to cover the first rubber connection cylinder, the second rubber connection cylinder, a part of the first power cable, the insertion cable, and a part of the second power cable;
A filler filled between the first and second rubber connection cylinders and the second rubber connection cylinder and the protective tube;
At least one of the first power cable and the second power cable is connected to the protective tube inside the protective tube and at the axial outer side of the first rubber connection cylinder and the second rubber connection cylinder Connection fixing part to fix,
Cable connection structure with. The connection fixing portion for connecting and fixing the insert cable and the protective pipe is further provided on the inner side of the protective pipe and at the axial outer side of the first rubber connecting cylinder and the second rubber connecting cylinder. Cable connection structure described. The cable connection structure according to claim 3 or 4, wherein the connection fixing portion is provided as a pair across the first rubber connection cylinder, the insertion cable and the second rubber connection cylinder. First and second power cables each having a conductor at its center,
A conductor is provided at the center, interposed between the first power cable and the second power cable, and the axes of the conductors are aligned with each other for each of the first power cable and the second power cable Butt cable,
A first conductor connection pipe for compressively connecting the conductors of the first power cable and the insertion cable;
A first rubber connection cylinder externally fitted to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
A second conductor connection pipe for compression-connecting the conductors of the second power cable and the insertion cable;
A second rubber connection cylinder externally fitted to the second conductor connection pipe, a part of the second power cable, and a part of the insertion cable;
A protective pipe provided to cover the first rubber connection cylinder, the second rubber connection cylinder, a part of the first power cable, the insertion cable, and a part of the second power cable;
A filler filled between the first and second rubber connection cylinders and the second rubber connection cylinder and the protective tube;
A connection / fixing portion for connecting and fixing the insert cable and the protection pipe inside the protection pipe and outside the axial direction of the first rubber connection cylinder and the second rubber connection cylinder;
Cable connection structure with. The connection fixing portion is
A clamp for gripping at least one of the pair of power cables;
A connecting plate portion connecting the protective tube and the clamp;
The cable connection structure according to any one of claims 1 to 6, which has The protective tube has an inner collar extending radially inwards,
The cable connection structure according to claim 7, wherein the connection plate portion connects the inner flange portion and the clamp. The cable according to claim 7 or 8, wherein the connection fixing portion has a cushion layer interposed between at least one of the pair of power cables and the clamp and absorbing radial expansion of the power cable. Connection structure. The cable connection structure according to claim 9, wherein the clamp has an unevenness on at least the cushion layer side. Butting a pair of power cables, each having a conductor at its center, with the axes of the conductors in alignment with one another;
Compression connecting the conductors of the pair of power cables with a conductor connection pipe;
Externally fitting a rubber connection cylinder so as to cover the conductor connection pipe and a part of each of the pair of power cables;
Providing a protective tube to cover the rubber connection cylinder and a portion of each of the pair of power cables;
Filling a filler between the rubber connection cylinder and the protective tube;
Have
In the process of providing the protective tube,
A method of manufacturing a cable connection structure, in which at least one of the pair of power cables and the protective tube are connected and fixed by the connecting and fixing portion inside the protective tube and at the axial outer side of the rubber connection cylinder. Providing a first power cable, a second power cable and an insertion cable, each having a conductor at its center,
The insertion 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 insertion cable have axes of the conductors of each other. Matching and matching steps;
Compressively connecting the conductors of the first power cable and the insertion cable with a first conductor connection pipe;
Compressively connecting the conductors of the second power cable and the insert cable with a second conductor connection pipe;
Fitting the first rubber connection cylinder so as to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
Fitting a second rubber connection cylinder so as to cover the second conductor connection pipe, a part of the second power cable and a part of the insertion cable;
Providing a protective pipe to cover the first rubber connection cylinder, the second rubber connection cylinder, a portion of the first power cable, the insertion cable, and a portion of the second power cable;
Filling a filler between the first rubber connection cylinder and the second rubber connection cylinder and the protective pipe;
Have
In the process of providing the protective tube,
At least one of the first power cable and the second power cable is connected to the protective tube inside the protective tube and at the axial outer side of the first rubber connection cylinder and the second rubber connection cylinder The manufacturing method of the cable connection structure linkedly fixed by a fixing | fixed part. Providing a first power cable, a second power cable and an insertion cable, each having a conductor at its center,
The insertion 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 insertion cable have axes of the conductors of each other. Matching and matching steps;
Compressively connecting the conductors of the first power cable and the insertion cable with a first conductor connection pipe;
Compressively connecting the conductors of the second power cable and the insert cable with a second conductor connection pipe;
Fitting the first rubber connection cylinder so as to cover the first conductor connection pipe, a part of the first power cable, and a part of the insertion cable;
Fitting a second rubber connection cylinder so as to cover the second conductor connection pipe, a part of the second power cable and a part of the insertion cable;
Providing a protective pipe to cover the first rubber connection cylinder, the second rubber connection cylinder, a portion of the first power cable, the insertion cable, and a portion of the second power cable;
Filling a filler between the first rubber connection cylinder and the second rubber connection cylinder and the protective pipe;
Have
In the process of providing the protective tube,
A manufacturing method of a cable connection structure in which the insert cable and the protective tube are connected and fixed by the connection fixing portion inside the protective tube and at the axial direction outer side of the first rubber connection cylinder and the second rubber connection cylinder. .

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