JP2019201449A - Connection structure, connection method and connection member - Google Patents

Abstract

To provide a connection structure, a connection method and a connection member capable of improving workability during cable connection work.SOLUTION: A connection structure is provided for a cable 2 including: core wires 10 each including a conductor, a wire-resistant layer and an insulator layer; and a cable sheath covering the core wires 10. The connection structure comprises: connectors for connecting multiple core wires 10; space forming members 5 for forming a space S passing the core wires 10; a fire-resistant member 6 covering the core wires 10 and the space forming members 5; and a cover member covering the fire-resistant member 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fireproof cable connection structure, a connection method, and a connection member.

  Conventionally, various connection structures for connecting a plurality of cables are known. Patent Document 1 describes a branch connection structure for fireproof cables that connects a main line side fireproof cable and a plurality of branch side fireproof cables. The main line side fireproof cable and the branch side fireproof cable have the same configuration.

  The main line side fireproof cable and the branch side fireproof cable include a cable conductor, a cable fireproof layer, a cable insulator, and a cable sheath. The main line side fireproof cable and the branch side fireproof cable are subjected to terminal treatment so that the cable conductor, the cable fireproof layer, and the cable insulator are exposed from the terminal side. Further, the branch connection structure described above includes a sleeve and an inorganic material compound that connect a plurality of cable conductors extending from each of the plurality of fireproof cables, a fireproof layer that covers the sleeve and the inorganic material compound, and an insulating layer that covers the fireproof layer, And a protective layer covering the insulating layer.

  The fireproof layer of the aforementioned branch connection structure is formed by winding a plurality of mica tapes (mica composite tape). The mica tape is composed of a soft natural laminated mica (phlogopite) and a film (backing material) or a soft natural laminated mica and a glass cloth (backing material). For example, four or five mica tapes are wound from the cable fireproof layer of the trunk side fireproof cable to the cable fireproof layer of the branch side fireproof cable.

JP 2002-42563 A

  Like the branch connection structure described above, mica tape is used to connect the fireproof cable. However, mica tape may be difficult to wind due to its low adhesiveness. In addition, the mica tape has a problem that it is difficult to handle because it has low elasticity and may be chipped or cracked during use. Accordingly, in the above-described work of connecting the fireproof cable, the mica tape must be wound a plurality of times over a predetermined range, so that the mica tape is difficult to wind and the workability is not good.

  A connection structure according to an aspect of the present invention is a cable connection structure including a conductor having a conductor, a fireproof layer, and an insulator layer, and a sheath covering the conductor, and a connector that connects a plurality of conductors. And a space forming member that forms a space through which the core wire passes, a fire resistant member that covers the core wire and the space forming member, and a covering member that covers the fire resistant member.

  In the connection structure of this form, the core wire has a conductor, a fireproof layer, and an insulator layer, and the conductors of the plurality of core wires are connected to each other by a connector. The connection structure includes a space forming member that forms a space through which the core wire passes, and the core wire is disposed in a space formed by the space forming member. Further, the connection structure includes a fireproof member, and the fireproof member covers the core wire and the space forming member arranged in the space formed by the space forming member. Therefore, since the individual core wires are housed in the space surrounded by the fire-resistant space forming member and the fire-resistant member, fire resistance can be ensured without using mica tape. Therefore, instead of using mica tape, a desired fire resistance can be obtained by placing the core wire on the space forming member and covering the space forming member and the core wire with the fire resistant member. Can be done. Further, after passing the core wire through the space formed by the space forming member, the core wire and the space forming member are covered with the fireproof member. As a result, by arranging the core wire in the space formed by the space forming member, it is possible to secure a route for each core wire without the core wire and the other core wires intersecting each other. Therefore, it is possible to cover each core wire with a fireproof member while keeping the position of each single core wire stable, and to suppress the movement of the core wire when covering the fireproof member. Connection work can be performed efficiently.

  In the connection structure according to another embodiment, the space forming member may have extending portions extending radially with respect to the axis of the cable.

  In the connection structure according to another embodiment, the refractory member may be spiral in a state where no external force is applied.

  In the connection structure according to another embodiment, the fireproof member and the space forming member may be continuous with each other.

  In the connection structure according to another embodiment, the space forming member may have an extending portion that extends radially with respect to the axis of the cable, and the extending portion may be narrowed away from the axis of the cable.

  In the connection structure according to another embodiment, the space forming member has an extending portion that extends radially with respect to the axis of the cable, and the thickness of the extending portion is constant along the radial direction of the cable. May be.

  A connection method according to an aspect of the present invention is a cable connection method including a conductor having a conductor, a refractory layer, and an insulator layer, and a sheath covering the conductor, and the insulator layer is exposed so that the conductor is exposed. And the step of stripping the fireproof layer, the step of connecting the exposed plurality of conductors via the connector, the step of passing the core wire through the space formed by the space forming member, and covering the core wire and the space forming member with the fireproof member A process.

  In this connection method, conductors of a plurality of core wires each having a conductor, a refractory layer, and an insulator layer are connected to each other by a connector, and each core wire is disposed in a space formed by a space forming member. And a fireproof member covers the core wire and space formation member which are arrange | positioned in the space formed of the space formation member. Therefore, since each core wire is arranged in the space formed by the space forming member and the core wire is covered with the space forming member by the fire resistant member, fire resistance performance can be ensured without using mica tape. Therefore, since a desired fireproof performance can be obtained by using a space forming member for disposing each core wire and a fireproof member covering the core wire and the space forming member in place of the mica tape, the cable connection work for ensuring the fireproof performance. Can be easily performed. Moreover, the operation | work which covers a fireproof member in the state which stabilized the position of the core wire can be performed by performing the operation | work which covers with a fireproof member, after passing a core wire in the space which a space formation member forms. Therefore, the cable connection work can be performed efficiently.

  A connection member according to one aspect of the present invention is a connection member that connects a cable including a conductor, a fireproof layer, and an insulator layer, and that passes through a connector that connects a plurality of conductors. A space forming member that forms a space; and a fireproof member that covers the core wire and the space forming member.

  In the connection member of this form, the core wire has a conductor, a fireproof layer, and an insulator layer, and the conductors of the plurality of core wires are connected to each other by a connector. A connection member is provided with the space formation member which forms the space which arrange | positions a core wire, and the fireproof member which covers a core wire and the space formation member. Therefore, since the core wire is disposed in the space formed by the space forming member and the space forming member and the core wire are covered with the fireproof member, the fireproof performance can be ensured even without the mica tape. Therefore, similarly to the connection structure and connection method described above, a mica tape that is difficult to handle can be dispensed with, so that cable connection work for ensuring fire resistance can be easily performed. Furthermore, since the core wire is arranged in the space of the space forming member and then the coating with the fireproof member is performed, the covering operation can be performed in a state where the position of the core wire is stabilized. Therefore, the cable connection work can be performed efficiently.

  According to the present invention, workability of cable connection work can be improved.

It is sectional drawing which shows the connection structure of the cable which concerns on 1st Embodiment. It is a perspective view which shows the core wire of the cable of FIG. 1, a space formation member, and a fireproof member. It is the front view and side view which show the fireproof member of FIG. It is the front view and side view which show the space formation member of FIG. (A), (b) is a figure which shows the procedure of the connection method which concerns on 1st Embodiment. (A), (b) is a figure which shows the continuation of the procedure of FIG. (A), (b) is sectional drawing which shows the continuation of the procedure of FIG. It is sectional drawing which shows the continuation of the procedure of FIG. (A), (b) is a figure which shows the space formation member which concerns on 2nd Embodiment. (A) is sectional drawing which shows the space formation member which concerns on 3rd Embodiment. (B) is sectional drawing which shows the space formation member of FIG. 10 (a), a fireproof member, and a core wire. (A) is a perspective view which shows the space formation member and fireproof member which concern on 4th Embodiment. (B) is a perspective view which shows the space formation member of FIG. 11 (a), a fireproof member, and a core wire. It is sectional drawing which shows the space formation member and core wire which concern on 5th Embodiment. It is a perspective view which shows the experimental apparatus of a cable.

  Hereinafter, embodiments of a connection structure, a connection method, and a connection member according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and repeated description is omitted as appropriate. The drawings may be simplified or exaggerated for easy understanding, and dimensions and the like are not limited to those described in the drawings.

  The connection structure, the connection method, and the connection member are for connecting a plurality of fireproof cables to each other. In this specification, the “core wire” includes a refractory electric wire having a conductor, a refractory layer and an insulator layer. The “cable” includes a refractory cable including a core wire and a sheath covering the core wire. “Fireproof member” means, for example, a member that exhibits insulation performance even after undergoing a fireproof test specified in “Connected portion fireproof test method (small heating furnace)” (JCS7505: 2014). A member having fire resistance, and a member that suppresses the combustion of the other member by covering the other member.

  The “space forming member” indicates a member that forms a space through which the core wire passes, and includes, for example, a member that forms a space through which each of the plurality of core wires passes. “Coating member” indicates a member that covers another member, and includes both a member that covers the entire other member and a member that covers a part of the other member. Further, “spiral” indicates that the coil is wound clockwise or counterclockwise, and includes both a state where it is wound more than one turn and a state where it is wound less than one turn.

(First embodiment)
As shown in FIG. 1, the connection structure 1 according to the first embodiment connects the cables 2 </ b> A and 2 </ b> B to each other at the cable connection portion C located between the plurality of cables 2 </ b> A and 2 </ b> B. The cables 2A and 2B are fireproof cables. The cross-sectional shapes of the cables 2A and 2B are circular, for example, but can be changed as appropriate. For example, the connection structure 1 is a structure capable of supplying power in an emergency, such as a sprinkler fire extinguishing facility or an emergency light.

  The structure of the cable 2A and the structure of the cable 2B may be the same as each other or different from each other. Hereinafter, an example in which the structure of the cable 2A and the structure of the cable 2B are the same will be described. In addition, each of the cable 2A and the cable 2B may be described as the cable 2.

  The cable 2 includes, for example, a plurality of core wires 10 and a cable sheath 3 (sheath) that covers the plurality of core wires 10. The number of the cores 10 is, for example, four, but can be changed as appropriate. Each core wire 10 includes a conductor 11, a refractory layer 12 that covers the conductor 11, and an insulator layer 13 that covers the refractory layer 12.

  In the cable connection portion C, the end portion of the core wire 10 is exposed. In the cable connection portion C, the insulator layer 13 and the refractory layer 12 are stripped from the end portion of the core wire 10 so that the conductor 11 is exposed. The insulator layer 13 and the refractory layer 12 may be peeled off from the end of the core wire 10 so that the conductor 11, the refractory layer 12 and the insulator layer 13 are arranged in this order. The method of peeling off the layer 12 can be changed as appropriate. The refractory layer 12 may be a refractory layer made of mica, for example. In this case, the refractory layer 12 includes mica and is a layer having excellent electrical insulation and heat resistance. The insulator layer 13 is made of, for example, crosslinked polyethylene. However, the materials of the refractory layer 12 and the insulator layer 13 can be changed as appropriate.

  As an example, the locations where the insulator layer 13 and the refractory layer 12 are peeled off in the plurality of core wires 10 are shifted from each other in the longitudinal direction D1 of the cable 2. However, in this embodiment, the locations where the insulator layer 13 and the refractory layer 12 are peeled off in the plurality of core wires 10 do not have to be shifted from each other in the longitudinal direction D1, and can be changed as appropriate.

  The connection structure 1 according to the present embodiment includes a connector 4 that connects the conductors 11 of the core wires 10 extending from the cables 2A and 2B, and a space forming member 5 that forms a space through which each core wire 10 passes. The fireproof member 6 that covers the plurality of core wires 10 and the space forming member 5 and the room temperature shrink member 7 that is a covering member that covers the fireproof member 6 are provided. The connection member 21 according to the present embodiment includes, for example, a connector 4, a space forming member 5, and a fireproof member 6. The connector 4 is, for example, a sleeve for caulking and connecting a plurality of conductors 11. The connector 4 may be of a type in which the two conductors 11 are caulked and connected in a state of being abutted, or of a type in which the two conductors 11 are caulked and connected in parallel. Also good.

  The room temperature shrink member 7 is a member that is provided to fasten the fire-resistant member 6 and the cables 2A and 2B from the outside and serves as an outer covering that covers the cable connection portion C. For example, the cold shrink member 7 is a cold shrink tube that is made of rubber that shrinks at room temperature and has excellent stretch properties. The room temperature shrink member 7 is made of, for example, a material having insulating properties and waterproof properties. As a specific example, the material of the cold shrink member 7 is EPDM rubber or silicone rubber.

  The normal temperature shrinkable member 7 may be pulled out and held in an expanded state on the outer periphery of a diameter-enlarged holding member formed in a tubular shape before fastening the core wire 10 and the cables 2A and 2B. . This diameter expansion holding member includes, for example, a disassembly line wound in a spiral shape and a core ribbon that is a drawable string-like body, and can be disassembled sequentially from the disassembly line by pulling out the core ribbon. The room temperature shrinkable member 7 expanded in diameter by the expanded diameter holding member is gradually reduced in diameter by tightening the cable 2 and the refractory member 6 by pulling out the core ribbon while the refractory member 6 and the cable 2 are passed through.

  As described above, the pulling-out tubular hollow diameter increasing holding member has a mode in which the room temperature shrinking member 7 is gradually reduced in diameter by pulling the core ribbon as described above. There is also an aspect in which it is detached by sliding with respect to 7 and being pulled out from the cold shrink member 7. Further, the covering member that covers the fire-resistant member 6 may be other than the room temperature shrinkable member 7, for example, a tape member having insulation and waterproofing, a two-component mixed resin, etc. It may be a liquid resin material and a resin member that cures with time. In this case, the covering member may be a resin member formed by curing resin poured into a mold arranged so as to surround the fireproof member 6.

  FIG. 2 is a perspective view showing a plurality of core wires 10 extending from the cable 2, the space forming member 5, and the refractory member 6. FIG. 3 is a front view and a side view showing the fireproof member 6. As shown in FIGS. 2 and 3, the refractory member 6 has a spiral shape that covers the plurality of core wires 10 and the space forming member 5. The fire-resistant member 6 covers the connector 4, the core wire 10, and the space forming member 5, for example, and exhibits fire resistance performance together with the space forming member 5. For example, the refractory member 6 is spiral in a state where no external force is applied.

  The fireproof member 6 is made of, for example, silicone rubber. The refractory member 6 may be made of a refractory rubber material. For example, the refractory member 6 may be made of a material that has an insulating property when ignited and becomes hard and sinters so as not to allow fire. Silicone rubber is a material that generates less substances with high electrical conductivity both during and after combustion. Therefore, when the fireproof member 6 is made of silicone rubber, the fireproof member 6 having higher fire resistance can be obtained, so that fireproof performance and insulation performance can be improved.

  As an example, the Shore A hardness of the refractory member 6 is 60 or more and 80 or less, or 70 or more and 80 or less, and the elongation rate of the refractory member 6 is 110% or more and 400% or less, or 110% or more and 200% or less. The tensile strength of the refractory member 6 is 3.0 MPa or more and 9.0 MPa or less. Further, the smoke resistance (Ds value) of the refractory member 6 is less than 30, and the oxygen index of the refractory member 6 is 40 or more and 60 or less. The fireproof member 6 may be cut and used according to the size of the cable connection portion C, for example.

  The fireproof member 6 may be a flexible sheet-like member. Further, as described above, the refractory member 6 may be braided in a spiral shape. That is, the fireproof member 6 may be a fireproof spiral tube that extends long in the axial direction (longitudinal direction). The refractory member 6 has an inner surface 6 a that contacts the space forming member 5, an outer surface 6 b that faces the opposite side of the inner surface 6 a, and spiral end surfaces 6 c that are positioned at both ends of the refractory member 6 in the axial direction.

  Here, “flexibility” includes being able to bend by hand, and including being able to be bent or rolled by hand because it is flexible. “Flexibility” includes a property that does not bend even when a force is applied, and may further include a property that is freely deformed when a force is applied. “Sheet-like” indicates a two-dimensionally expanded state, and “sheet-like member” includes a member that is thin and easily re-wrapped on another member.

  The refractory member 6 is manufactured, for example, by molding or extruding in the axial direction. In this case, since the refractory member 6 is spiral at the time of molding, the spiral shape of the refractory member 6 is reliably maintained. However, the refractory member 6 is flattened in advance, and even if the refractory member 6 is later spiraled by heat treatment or cross-linking treatment after the flat refractory member 6 is wound around a pipe or the like. Good.

  The length L1 of the fireproof member 6 in the longitudinal direction is, for example, not less than 100 mm and not more than 150 mm, and is 130 mm as an example. The number of spiral turns of the refractory member 6 is, for example, two or more. The diameter E (the diameter E of the spiral portion of the refractory member 6) when the refractory member 6 is cut along a plane orthogonal to the axial direction thereof is, for example, 5 mm or more and 50 mm or less, and is 20 mm as an example. However, the diameter E is appropriately changed according to the diameter of the cable 2 and the like. The thickness of the refractory member 6 is, for example, not less than 0.5 mm and not more than 2.0 mm, and is 1.0 mm as an example. Moreover, the sum total of the thickness of the wound fireproof member 6 is 2 mm or more, for example. In this case, the refractory member 6 is wound around the outside of the space forming member 5 so as to have a thickness of 2 mm or more.

  FIG. 4 is a front view and a side view showing the space forming member 5. As shown in FIGS. 2 and 4, the space forming member 5 forms a space S through which the core wire 10 passes. The space forming member 5 is provided, for example, to determine the position of the core wire 10. For example, the space forming member 5 forms a space S through which each core wire 10 passes by partitioning the space inside the refractory member 6 into a plurality of regions. By forming the space S through which the space forming member 5 passes the core wire 10 in this manner, the position of the core wire 10 inside the refractory member 6 can be stabilized. That is, by arranging the core wire 10 in each of the plurality of spaces S formed by the space forming member 5, the crossing of one core wire 10 and the other core wire 10 is suppressed, and the space S is 1 A route for one core 10 is secured.

  The space forming member 5 extends radially from the axis L of the cable 2 radially outward, for example. The space forming member 5 has a central portion 5b and extending portions 5a extending radially from the central portion 5b. As an example, the space forming member 5 has four extending portions 5 a arranged in a cross shape, and the four extending portions 5 a are arranged at equal intervals in the circumferential direction of the cable 2. In this case, the plurality of extending portions 5a are arranged with a phase angle of 90 degrees.

  The space forming member 5 is made of, for example, silicone rubber. As an example, the material of the space forming member 5 is the same as the material of the refractory member 6, but may be a material different from the material of the refractory member 6. Each extending portion 5a of the space forming member 5 may be a flexible sheet-like member. The space forming member 5 is manufactured, for example, by molding in the same manner as the refractory member 6 or by extrusion molding in the axial direction (longitudinal direction). In this case, for example, the space forming member 5 has a cross shape at the time of molding.

  Each extending portion 5a of the space forming member 5 has a flat surface 5c that faces each core wire 10, and an end surface 5d that is located at the end opposite to the central portion 5b of the flat surface 5c. Both the front and back planes 5c of the extending portion 5a extend in the radial direction of the cable 2 (spiral refractory member 6), for example, extend in parallel to each other. That is, the thickness of the extending portion 5a is constant along the radial direction. As an example, the end face 5d is a plane extending in a direction intersecting the plane 5c, and may be orthogonal to the plane 5c. The end surface 5d is located at the radially outer end of the space forming member 5, and is a surface with which the inner surface 6a of the refractory member 6 faces or contacts.

  The length L2 of the space forming member 5 in the longitudinal direction (axial direction of the cable 2) is, for example, 70 mm or more and 120 mm or less, and is 95 mm as an example. The thickness T of the extending portion 5a of the space forming member 5 is, for example, 1.5 mm or more and 2.5 mm or less, and is 2.0 mm as an example. The width B of the space forming member 5 (the sum of the length of the two extending portions 5a and the thickness of the extending portions 5a) is, for example, 15 mm or more and 25 mm or less, and is 20 mm as an example.

  Next, a connection method for connecting the cable 2 using the connection member 21 will be described. Hereinafter, an example in which two cables 2A and 2B are connected to each other will be described. However, the connection method according to the present embodiment is a case where three or more cables are connected, or a case where cables are connected to other devices. It is also applicable to. First, as shown in FIG. 5A, the end face of the cable 2A and the end face of the cable 2B are made to face each other. At this time, one of the cable 2 </ b> A or the cable 2 </ b> B is passed through the room temperature shrink member 7 that has been expanded in a cylindrical shape.

  In this state, as shown in FIG. 5B, the cable sheath 3 is peeled off from each of the cable 2A and the cable 2B to expose the plurality of core wires 10. Next, the opposing positions of the plurality of core wires 10 may be staggered along the longitudinal direction D1 (each of the plurality of core wires 10 may be opposed to the longitudinal direction D1 at different positions). However, in the present embodiment in which the space S through which the core wire 10 passes is partitioned by the space forming member 5, the above staggered arrangement can be made unnecessary.

  Subsequently, as shown in FIG. 6A, terminal treatment is performed on each core wire 10 so as to expose the conductor 11 so that the conductor 11 is exposed (insulator layer and refractory layer). Process of peeling). At this time, terminal treatment (stepping) may be performed to peel off the insulator layer 13 and the refractory layer 12 so that the conductor 11, the refractory layer 12 and the insulator layer 13 are exposed in this order. Since 11 may be connected, exposure of the refractory layer 12 can be made unnecessary. Then, as shown in FIG. 6B, after the plurality of conductors 11 are abutted, the plurality of conductors 11 are caulked with a connector 4 to connect the plurality of conductors 11 (step of connecting conductors). At this time, instead of abutting the plurality of conductors 11, the conductors 11 may be connected (branched connection) with the connector 4 in a state in which the plurality of conductors 11 are juxtaposed in parallel.

  Next, as shown in FIG. 7A, the space forming member 5 is disposed between each of the plurality of core wires 10, and each of the plurality of core wires 10 is opposed to each flat surface 5c of the extending portion 5a. Let That is, each core wire 10 is disposed in each of the spaces S formed by the space forming member 5 (step of passing the core wire through the space formed by the space forming member). And as FIG.7 (b) shows, the fireproof member 6 is wound around the several core wire 10 and the space formation member 5 (process covered with a fireproof member).

  Thereafter, as shown in FIG. 8 and FIG. 1, the fireproof member 6 is covered with the cold shrink member 7 passed through the cable 2A or cable 2B, and the cold shrink member 7 is sequentially shrunk, for example, by pulling out the core ribbon of the expanded diameter holding member. Let the diameter. The cables 2A and 2B, the fireproof member 6 and the space forming member 5 are strongly tightened by the room temperature shrinking member 7 having the diameter reduced in this way (step of tightening the fireproof member and the space forming member with the covering member). The construction of the connection structure 1 is completed through the above steps.

  Next, the effect of the connection structure 1, the connection member 21, and the connection method according to the present embodiment will be described in detail.

  In the connection structure 1, the connection member 21, and the connection method according to the present embodiment, the core wire 10 includes the conductor 11, the refractory layer 12, and the insulator layer 13, and the conductors 11 of the plurality of core wires 10 are connected by the connector 4. Connected to each other. The connection structure 1 includes a space forming member 5 that forms a space S through which the core wire 10 passes, and the core wire 10 is disposed in the space S formed by the space forming member 5. Further, the connection structure 1 includes a fireproof member 6, and the fireproof member 6 covers the core wire 10 and the space forming member 5 arranged in the space S formed by the space forming member 5. Therefore, the core wire 10 is arranged in the space S formed by the space forming member 5 and the core wire 10 is covered together with the space forming member 5 by the fireproof member 6.

  By the way, conventionally, a mica tape is generally used for connecting a fireproof cable. The mica tape is composed of silicon oxide, aluminum oxide, potassium oxide and an adhesive. A conventional fireproof cable connection method is described in JCS4506, which is a product standard for fireproof cables. According to JCS4506, the core wire connection portion is specified to be wound four times.

  However, mica tape is difficult to handle and difficult to wind because of its low flexibility and adhesiveness. Therefore, when winding mica tape, the winding quality varies depending on the skill level of the operator and it is difficult to wind it neatly. Furthermore, when a plurality of core wires are provided as in this embodiment, the mica tape must be wound four times around each core wire. Therefore, since a long time is required for the winding work, there is a problem that workability is not good.

  On the other hand, in the present embodiment, as described above, the space forming member 5 defines the space S through which the core wire 10 passes, and after the core wire 10 is disposed in the space S, the fireproof member 6 and the space forming member 5 together. Cover the core 10. Therefore, since the individual core wires 10 are stored in the space S surrounded by the fire-resistant space forming member 5 and the fire-resistant member 6, fire resistance can be ensured without using mica tape. Accordingly, instead of using the mica tape, if the core wire 10 is arranged on the space forming member 5 and the space forming member 5 and the core wire 10 are covered with the fireproof member 6, the desired fireproof performance can be obtained. Cable connection work can be performed easily.

  Moreover, after passing the core wire 10 through the space S formed by the space forming member 5, an operation of covering with the fireproof member 6 is performed. As a result, by arranging the core wire 10 in the space S formed by the space forming member 5, the core wire 10 and the other core wire 10 do not cross each other, and the path of the one core wire 10 is secured. can do. Therefore, each core wire 10 can be covered with the refractory member 6 while the position of each one of the core wires 10 is stabilized, and the movement of the core wire 10 when the refractory member 6 is covered can be suppressed. Therefore, the connection work of the cables 2A and 2B can be performed efficiently. In JCS4506, an operation of winding a black adhesive polyethylene insulating tape twice or more is required for a core wire connection portion wound with mica tape. However, in the present embodiment, since the above work can be eliminated, the connection work of the cables 2A and 2B can be performed more efficiently.

  Specifically, in the connection work of the 4-core fireproof cable as shown in FIG. 1, when the conventional mica tape is wound four times, it takes about three minutes to wind one place four times. Therefore, it took 12 minutes to wind the mica tape around the four core wires. On the other hand, when each core wire 10 is arranged on the space forming member 5 and the refractory member 6 is wound, it is not necessary to wind the mica tape around each core wire 10, so at least a time of 10 minutes or more (further polyethylene) It is possible to reduce the time for winding the insulating tape.

  The space forming member 5 has extending portions 5 a that extend radially with respect to the axis L of the cable 2. Therefore, by arranging the space forming member 5, it is possible to easily form the space S in which the core wire 10 is arranged between the plurality of extending portions 5a extending radially.

  Moreover, the fireproof member 6 is spiral in a state where no external force is applied. Therefore, by making the fireproof member 6 into a spiral shape, the fireproof member 6 can be bent by hand and the winding work of the fireproof member 6 can be easily performed. That is, since the refractory member 6 has been spiraled in advance, the spirally formed refractory member 6 is opened by hand, and the end surface 5d of the space forming member 5 is covered with the inner surface 6a of the refractory member 6, thereby forming the space forming member. 5 can be easily wound around the refractory member 6. Accordingly, the work of winding the refractory member 6 can be performed more easily, and the workability can be further improved.

  Further, the thickness of the extending portion 5 a of the space forming member 5 is constant along the radial direction of the cable 2. Therefore, since the plurality of extending portions 5a having a constant thickness can be used as the space forming member 5 extending radially, the space forming member 5 can be easily manufactured by simplifying the shape of the space forming member 5. .

(Second Embodiment)
Next, a connection structure and a connection member according to the second embodiment will be described with reference to FIGS. 9 (a) and 9 (b). The connection structure and connection member according to the second embodiment are different from the first embodiment in that a space forming member 35 different from the space forming member 5 is provided. In the following description, the description overlapping with the first embodiment is omitted as appropriate.

  As shown in FIG. 9A, the space forming member 35 includes a first plate member 35a and a second plate member 35b. The first plate member 35a and the second plate member 35b are both rectangular, for example. Each of the first plate-like member 35a and the second plate-like member 35b has slits 35c and 35d extending in the longitudinal direction D3 of the space forming member 35. For example, the length L3 in the longitudinal direction D3 of the slit 35c is substantially the same as the difference X1 obtained by subtracting the length L4 of the slit 35d from the length in the longitudinal direction D3 of the second plate member 35b. In this case, the length L4 in the longitudinal direction D3 of the slit 35d is substantially the same as the difference X2 obtained by subtracting the length L3 of the slit 35c from the length in the longitudinal direction D3 of the first plate member 35a. The thickness of the first plate member 35a is approximately the same as the width of the slit 35d, and the thickness of the second plate member 35b is approximately the same as the width of the slit 35c.

  Accordingly, the second plate member 35b can be inserted into the slit 35c of the first plate member 35a, and the first plate member 35a can be inserted into the slit 35d of the second plate member 35b. Thus, when the plate-like members 35b and 35a are inserted into the slits 35c and 35d, the cross-shaped space forming member 35 is assembled as shown in FIG. 9B. The shape and size of the space forming member 35 after assembly are substantially the same as, for example, the shape and size of the space forming member 5 described above.

  As described above, the space forming member 35 according to the second embodiment includes the first plate member 35a and the second plate member 35b, and is configured by assembling the first plate member 35a and the second plate member 35b. Is done. Therefore, since the space forming member 35 can be manufactured from the first plate-like member 35a and the second plate-like member 35b having a simple shape, a load such as molding can be reduced. In the second embodiment, each of the first plate member 35a and the second plate member 35b has slits 35c and 35d, and the space forming member 35 is inserted into the slits 35c and 35d. A configuration example has been described. However, the shape, size, number, and arrangement of each slit can be changed as appropriate, and a configuration other than the slit may be adopted as a configuration for assembling the first plate-like member and the second plate-like member.

(Third embodiment)
Next, the connection structure and connection member according to the third embodiment will be described with reference to FIGS. 10 (a) and 10 (b). The connection structure and connection member according to the third embodiment include a space forming member 45 different from the above-described embodiments. The material of the space forming member 45 is the same as the material of the space forming member 5 (or the refractory member 6), and includes, for example, silicone rubber. Similarly to the space forming member 5 described above, the space forming member 45 extends radially outward from the axis L of the cable 2 (fireproof member 6), and has a central portion 45b and a plurality of radially extending portions from the central portion 45b. The extending portion 45a. Each of the plurality of extending portions 45a has an inclined surface 45c that faces each core wire 10, and a top portion 45d that is located at the end of the inclined surface 45c opposite to the central portion 45b.

  The inclined surfaces 45c on the front and back sides of the extending portion 45a extend from the central portion 45b toward the top portion 45d while being inclined with respect to the radial direction. The front and back inclined surfaces 45c have, for example, a triangular shape, and the thickness of the extending portion 45a becomes thinner toward the outer side in the radial direction. In other words, each extending portion 45a becomes thinner as the distance from the axis line L increases. The flexibility of each extending part 45a becomes higher toward the top part 45d. Therefore, as shown in FIG. 10B, when the space forming member 45 is covered with the refractory member 6, the portion on the top portion 45 d side of each extending portion 45 a is bent and inclined in the circumferential direction of the refractory member 6. The size of each extending portion 45a in the radial direction is reduced.

  As described above, the space forming member 45 according to the third embodiment has the extending portion 45 a that extends radially with respect to the axis L of the cable 2, and the extending portion 45 a becomes thinner as the distance from the axis L of the cable 2 increases. Yes. Therefore, the size of the space forming member 45 in the radial direction can be reduced by bending the distal end side of the extending portion 45a in the circumferential direction. Further, the cores 10 can be accommodated by turning the extending portions 45a in the circumferential direction, and can be applied to various types of the cores 10.

(Fourth embodiment)
Next, a connection structure and a connection member according to the fourth embodiment will be described with reference to FIGS. 11 (a) and 11 (b). The connection structure and connection member according to the fourth embodiment include a space forming member 55 and a refractory member 56 that are different from the above-described embodiments. As shown in FIGS. 11A and 11B, the refractory member 56 and the space forming member 55 are continuous with each other. Here, “continuous to each other” indicates a state in which two members are connected and integrated, and when another member is present on the extension of one member, It includes both the case where the member is fixed and the other member extends from one member.

  The space forming member 55 includes, for example, an extension portion 45a similar to that of the third embodiment, and the fireproof member 56 extends from the extension portion 45a. The refractory member 56 may be integrally formed with the space forming member 55 or may be a part fixed to the space forming member 55. In the fourth embodiment, the fireproof member 56 extends from one of the plurality of extending portions 45 a in a sheet shape, and the fireproof member 56 is wound around the space forming member 55 from the outside.

  The refractory member 56 has a flat shape, and has a surface 56a facing the inner side in the radial direction and a surface 56b facing the outer side in the radial direction. An adhesive layer 56c is provided at the end of the surface 56a opposite to the space forming member 55. For example, the adhesive layer 56c extends in the longitudinal direction of the space forming member 55. For example, a release liner may be attached to the adhesive layer 56c.

  In the connection method according to the fourth embodiment, for example, the core wire 10 is disposed between the plurality of extending portions 45a and the fireproof member 56 extending from the extending portion 45a covers the space forming member 55, and the adhesive layer 56c is the surface. By being affixed to 56b, the process of passing the core wire through the space and the process of covering with a refractory member are executed. Note that the refractory member 56 may be spiral in a state where no external force is applied. In this case, since the fireproof member 56 is naturally wound around the space forming member 55, the adhesive layer 56c can be dispensed with.

  As described above, in the connection structure and connection member according to the fourth embodiment, the fireproof member 56 and the space forming member 55 are continuous with each other. Therefore, since the fireproof member 56 and the space forming member 55 can be integrated, the number of parts can be reduced. Further, the arrangement of the core wire 10 in the space S and the winding of the refractory member 56 can be smoothly performed by the integrated space forming member 55 and the refractory member 56. Therefore, it contributes to further improvement of workability.

(Fifth embodiment)
Next, the connection structure and connection member according to the fifth embodiment will be described with reference to FIG. The connection structure and connection member according to the fifth embodiment include a space forming member 65 that is different from the above-described embodiments. The material of the space forming member 65 is the same as the material of the space forming member 5 (or the refractory member 6), for example. The space forming member 65 has a central portion 65b and a plurality of extending portions 65a extending radially from the central portion 65b. Each extending portion 65a has a facing surface 65c that faces each core wire 10, and an outer surface 65d that is located at the end of the facing surface 65c opposite to the central portion 65b.

  Each opposing surface 65c is, for example, a curved surface along the outer periphery of each core wire 10, and the thickness of the extending portion 65a increases as it goes outward in the radial direction. That is, each extending part 65a becomes thicker as it is away from the axis L. Since the flexibility of each extending portion 65a increases toward the central portion 65b, each extending portion 65a can be easily moved in the circumferential direction. The outer surface 65d is curved, for example, in an arc shape, and an insertion hole 65e communicating with the space S is formed between the plurality of outer surfaces 65d. The core wire 10 is placed by inserting the core wire 10 into the space S from each insertion hole 65e.

  As described above, the space forming member 65 according to the fifth embodiment has the extending portion 65 a extending radially with respect to the axis L of the cable 2, and the extending portion 65 a becomes thicker as the distance from the axis L of the cable 2 increases. Yes. Therefore, since the insertion hole 65e of the core wire 10 communicating with the space S can be easily understood, the operation of arranging the core wire 10 in the space forming member 65 can be easily performed. As a result, it contributes to further improvement of workability.

  Although the connection structure, the connection method, and the connection member according to the present invention have been described above, the present invention is not limited to the above-described embodiments. The present invention can be variously modified without departing from the scope of the invention. For example, the shape, size, material, number, and arrangement of each component constituting the connection structure and each component constituting the connection member can be appropriately changed. Further, the contents and order of each step of the connection method can be changed as appropriate.

  For example, in each of the above-described embodiments, the space forming member including the extending portions having various shapes has been described. However, the shape, size, material, number, and arrangement of the extending portions are the same as those of the above-described embodiments. It is also possible to make further changes.

  Moreover, in embodiment mentioned above, although the cable 2 provided with the four core wires 10 was demonstrated, it replaced with the cable 2 and you may provide the cable which has 1-3 or 5 or more core wires. For example, in a cable having five or more core wires, if the number of extending portions of the space forming member is five or more, a space through which each core wire can be formed can be formed. In addition, a space forming member with a reduced number of extending portions may be prepared for a cable having three or less core wires, and the above-described space forming member 5 (see FIG. 8 and the like) can be used. It is. That is, when the space forming member 5 is used for a cable having three or less core wires, at least one of the four spaces S is an empty room.

  In the above-described embodiment, an example in which one core wire 10 and one core wire 10 are connected and one cable 2A and one cable 2B are connected has been described. However, the number of cores to be connected and the number of cables are not limited to the above example. For example, it may be a branched connection structure in which one core wire and two core wires are connected, and one cable and two or three cables are connected. In this case, the same effects as those of the above-described embodiments can be obtained. Furthermore, in the embodiment described above, the connection structure 1 capable of supplying power in an emergency has been described as an example. However, the connection structure may not be used in an emergency, and the use of the connection structure can be changed as appropriate. is there.

(Example)
Subsequently, examples of the connection structure, the connection method, and the connection member according to the present invention will be described. The present invention is not limited to the following examples. In the experiment according to the example, an experimental apparatus F shown in FIG. 13 was used. The experimental apparatus F includes a holding unit F1 that holds the cable, and the cable can be heated while the cable is held by the holding unit F1.

In the experiment, the fire resistance characteristics of the cable were confirmed using the experimental device F. This experiment was performed based on the JCS7505 standard in which a connection part fire resistance test method is defined. A voltage of 600 V was applied to a cable of FP4C having a conductor cross-sectional area of 8 mm ² . And the cable was heated at 840 degreeC for 30 minutes in the state which applied electricity. This heating was performed on the connection member according to the example. The connection member according to the example is the connection member 21 including the space forming member 5 and the fireproof member 6. The connection member according to this example was heated and an experiment was conducted as to whether or not dielectric breakdown occurred. As a result, the dielectric breakdown did not occur in the connection member according to the example.

  In addition, using the connection member according to the above example and the connection member according to the comparative example, the time required for connecting the cable was measured, and workability was confirmed. As the connection member according to the comparative example, a conventional connection member in which mica tape is wound around each connector of the four core wires was used. Table 1 below shows the results of confirming workability.

  As shown in Table 1, the time required for connecting the entire cable of the comparative example was 26.25 minutes, whereas the time required for connecting the entire cable of the example was 10.25 minutes. there were. As described above, in the connection member and the connection structure of the example including the space forming member 5 and the fireproof member 6, the time required for connecting the cable is reduced by 60% as compared with the comparative example, and the workability is greatly improved. It was.

DESCRIPTION OF SYMBOLS 1 ... Connection structure, 2, 2A, 2B ... Cable, 3 ... Cable sheath (sheath), 4 ... Connector, 5, 35, 45, 55, 65 ... Space formation member, 5a, 45a, 65a ... Extension part, 6, 56 ... fire resistant member, 7 ... normal temperature shrinkable member (cover member), 10 ... core wire, 11 ... conductor, 12 ... fire resistant layer, 13 ... insulator layer, 21 ... connecting member, L ... axis.

Claims (9)

A cable connection structure comprising a conductor having a conductor, a refractory layer and an insulator layer, and a sheath covering the conductor,
A connector for connecting a plurality of the conductors;
A space forming member that forms a space through which the core wire passes;
A refractory member covering the core and the space forming member;
A covering member for covering the refractory member;
Connection structure comprising. The space forming member has an extending portion extending radially with respect to the axis of the cable.
The connection structure according to claim 1. The refractory member is spiral in a state where no external force is applied,
The connection structure according to claim 1 or 2. The refractory member and the space forming member are continuous with each other.
The connection structure as described in any one of Claims 1-3. The space forming member has an extending portion extending radially with respect to the axis of the cable,
The extending portion is narrowed away from the cable axis.
The connection structure as described in any one of Claims 1-4. The space forming member has an extending portion extending radially with respect to the axis of the cable,
The thickness of the extending part is constant along the radial direction of the cable,
The connection structure as described in any one of Claims 1-4. A cable connection method comprising: a conductor having a conductor, a refractory layer, and an insulator layer; and a sheath covering the conductor;
Peeling the insulator layer and the refractory layer so that the conductor is exposed;
Connecting the exposed plurality of conductors via connectors;
Passing the core wire through the space formed by the space forming member;
Covering the core wire and the space forming member with a refractory member;
A connection method comprising: A connecting member for connecting a cable having a conductor, a refractory layer, and a core wire having an insulator layer,
A connector for connecting a plurality of the conductors;
A space forming member that forms a space through which the core wire passes;
A refractory member covering the core and the space forming member;
A connecting member comprising: The refractory member and the space forming member are continuous with each other.
The connection member according to claim 8.

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