JP4337982B2 - Cable support and adapter for cable support - Google Patents

Description

  The present invention relates to a cable support for supporting an insulation-coated cable whose core material is covered with an insulation material, such as an electric cable and a communication cable, along a laying line, and in particular, at a bending portion in a vertical laying, The present invention relates to a cable support that can prevent damage to the cable due to the cable.

When supporting an insulation covering cable such as an electric cable or a communication cable along the laying path, a cable support called a cleat may be used. This cleat has a cylindrical holding part for holding a cable, and a pedestal part for attaching to a construction object such as a C-type channel (groove steel having a C-shaped cross section) or a wall. Further, the cylindrical axis direction of the gripping portion and the mounting surface of the pedestal portion are parallel, and the positional relationship between the gripping portion and the pedestal portion is fixed (the gripping portion does not move relative to the pedestal portion). And such a cleat is arrange | positioned along an installation line, a cable is hold | gripped by the holding part of a cleat, and a cable is supported along an installation path | route. On the other hand, an electric cable or the like causes thermal expansion and contraction due to a Joule heat or a change in outside air temperature when energized. In particular, thermal expansion and contraction is large in power cables through which a large current flows. For this reason, a cleat having a structure in which the gripping force is maintained within a certain range even when the cable diameter changes due to thermal expansion / contraction of the cable, and the cable core direction (cylinder axis direction of the cleat gripping part) of the cable In some cases, the cleat slides in an orthogonal direction (for example, see Patent Document 1).
JP 2000-316228 A

  Incidentally, in some cases, it is necessary to lay an insulation-covered cable almost vertically and bend the cable in accordance with the laying route at the top of a steel tower or a shaft in a tunnel. For example, there is a case where a cable is laid vertically from the bottom to the top, and the cable is bent sideways (laid down) at the top. In such a case, the cable support is provided as a bending fulcrum (inflection point) in the bent portion. However, in the cable support (cleat) as described above, the cable is subjected to repeated thermal expansion and contraction due to its own weight or energization. There is a risk of damaging the cable. That is, when thermal expansion and contraction occurs, the bent portion of the cable tends to expand and contract (swing) in the direction of rising with the cable support as a fulcrum or the direction of sleeping. However, in the cable support as described above, since the grip portion cannot swing according to the expansion and contraction of the cable, the expansion and contraction of the cable is restrained by the cable support and stress is generated between the cable and the cable support. Further, deformation due to this stress may occur. And this gripping force (surface pressure) of the cable support (gripping part) does not become constant due to this stress and deformation, causing abnormal deformation of insulating layers such as electric cables and wrinkles of the copper tape shielding layer. Otherwise, damage such as insulation breakdown may occur. Such damage may also occur due to the weight of the cable at the bent portion in vertical installation.

  Then, an object of this invention is to provide the cable support tool which can prevent the damage to the insulation coating cable by thermal expansion and contraction or dead weight in the bending part etc. in vertical installation.

In order to achieve the above object, the invention described in claim 1 is a cable support for supporting an insulation-coated cable such as an electric cable or a communication cable along a laying line, and a gripping portion for gripping the insulation-coated cable; And an attachment part that is attached to an object to be laid such as a wall, and a connecting part that connects the attachment part and the grip part, and a direction perpendicular to the direction of the core of the grip part of the insulation-coated cable is an axis. The swing shaft is provided on one of the mounting portion or the connecting portion, and the other is provided with a bearing portion that supports the swing shaft, and the connecting portion is swingably connected to the mounting portion around the swing shaft. In addition, the bearing portion has a slit shape extending in a direction perpendicular to the core wire direction and the swing shaft in the gripped portion of the insulation-coated cable, and the swing shaft is supported by the bearing portion so as to be relatively slidable. It is characterized by that .
(Function)
Since the gripping part is swingable via the connecting part, even if the bent part of the insulation-coated cable is thermally expanded and contracted, the gripping part swings according to the thermal expansion and contraction, and the cable can freely expand and contract. For example, when laying a cable vertically from bottom to top and bending the cable sideways at the top, place the cable support with the swing shaft positioned in the direction perpendicular to the bending direction, and connect the cable at the grip. Hold it. When thermal expansion and contraction occurs in this state, the bent portion of the cable tends to expand and contract (swing) in the direction of rising with the cable support (gripping portion) as a fulcrum or the direction of sleeping. At this time, the gripper swings in the direction in which it swings (rotates) around the swing axis, that is, in the same direction as the direction in which the cable tries to swing. As a result, the cable can be expanded and contracted without being constrained by the cable support (gripping part).

  Moreover, when this cable support is arrange | positioned in the bending part in vertical laying as mentioned above, the moment of the bending direction of a cable is added to this cable support by the weight of a cable. On the other hand, as in the case of the thermal expansion and contraction, since the gripping part swings in the same direction as the cable bending direction, the cable is not restrained by the cable support (griping part) and is deformed by its own weight. It becomes possible.

Furthermore, since the grip portion is slidable via the swing shaft, the degree of freedom of expansion and contraction of the insulation-coated cable is further increased. For example, when the cable support is disposed at the bent portion in the vertical laying as described above, the direction of the cable at the gripped portion and the direction perpendicular to the swing axis, that is, the radius of curvature of the bent portion. The gripping part is slidable. For this reason, when thermal expansion / contraction occurs and the cable tries to expand / contract in the radius direction of curvature, the grip portion also slides in the radius direction of curvature according to the expansion / contraction. As a result, the cable can be expanded and contracted without being restrained by the grip portion.

According to a second aspect of the present invention, there is provided an adapter for a cable support for attaching a cable support having a grip part for gripping an insulation-coated cable such as an electric cable or a communication cable and a pedestal part to a construction object such as a wall. A mounting portion that is attached to the object to be laid, and a connecting portion that connects the mounting portion and the cable support, and a base mounting portion to which the base portion of the cable support is attached is provided in the connecting portion. When the attachment portion and the cable support are connected, a rocking shaft whose axis is a direction orthogonal to the direction of the core wire in the gripped portion of the insulation-coated cable is provided on one of the attachment portion or the connection portion, A bearing portion for supporting the swing shaft is provided, the connecting portion is swingably connected to the mounting portion around the swing shaft , and the bearing portion is in the direction of the core of the gripped portion of the insulation-coated cable. And swing axis A slit shape extending in a direction orthogonal to the swing axis in the bearing portion is supported to freely relative slide, characterized in that.
(Function)
Gripper swing, in the present adapter attached to the existing cable support without sliding (such as cleats), the grip portion is swung, it becomes possible to slide. That is, the cable support (gripping part) can be swung and slid with the swinging and sliding of the connecting part simply by attaching the base of the cable support to the base mounting part of the connecting part of the adapter. Thereby, even if thermal expansion and contraction occurs at the bent portion of the cable, the cable support swings and slides according to the thermal expansion and contraction, and the cable can expand and contract without being restrained by the cable support.

According to the present invention, the gripping portion swings and slides, so that the cable can be thermally expanded and contracted without being constrained even in the bent portion of the insulation-coated cable. For this reason, the stress and deformation | transformation concerning a cable and a cable support (grip part) are reduced, and the grip force of a grip part is maintained within fixed. As a result, abnormal deformation of an insulating layer such as an electric cable is suppressed, and damage such as dielectric breakdown can be prevented.

In addition, by attaching this adapter to an existing cable support that does not swing or slide , the cable support (grip) can be swung and slid. Can be used without causing cable damage in the bent portion of the cable.

  Hereinafter, the present invention will be described based on the illustrated embodiments.

  FIG. 1 is a side view showing a state in which a cable support 1 according to an embodiment of the present invention is arranged in a C-type channel A (clothing object) and an electric cable C is supported by the cable support 1. In this embodiment, an adapter 5 for cable support is attached to an existing cleat 2 (cable support) that is commercially available, and the cable support 1 is configured as a whole. It is comprised from the attachment tool 3 (attachment part) to be attached, and the connection tool 4 (connection part) which connects the cleat 2 and the attachment tool 3.

  In the present embodiment, the cleat 2 is a single-core spring-type cleat and, as shown in FIG. 2, is composed of a substantially upper body portion 21 and a lower body portion 22. A semi-cylindrical upper gripping portion 21a and a lower gripping portion 22a are formed in the center portion of the upper body portion 21 and the lower body portion 22, respectively. By combining the upper gripping portion 21a and the lower gripping portion 22a, A cylindrical gripping part for gripping the cable C is formed. The upper body portion 21 is formed with cylindrical spring accommodating portions 21b on the left and right in the circumferential direction of the upper gripping portion 21a, and a bolt insertion hole 21c is provided at the bottom thereof. On the other hand, the lower body portion 22 is formed with a flange portion 22b extending horizontally to the left and right in the circumferential direction of the lower gripping portion 22a. The flange portion 22b is provided with a bolt insertion hole 22c concentric with the bolt insertion hole 21c. ing. Then, with the washer 24 and the coil spring 25 attached to the adjustment bolt 23, the adjustment bolt 23 is inserted into the spring accommodating portion 21b, and nuts 26 and 26 (double nuts) are inserted through the bolt insertion holes 21c and 22c. Is tightened. Further, a pedestal portion 22d that extends horizontally (parallel to the cylindrical direction of the upper gripping portion 21a and the lower gripping portion 22a) is formed at the lower end of the lower gripping portion 22a of the lower body portion 22, and the pedestal portion 22d Mounting holes 22e are provided at both ends.

  In the cleat 2 having such a configuration, even when the electric cable C is thermally expanded and contracted by energization or the like and the cable diameter changes, the gripping force (surface pressure) on the electric cable C is maintained within a certain range. Yes. For example, when the diameter of the electric cable C decreases due to thermal expansion, the upper body portion 21 is pressed toward the lower body portion 22 by the coil spring 25, and the distance between the upper gripping portion 21a and the lower gripping portion 22a is reduced. The gripping force is maintained within a certain range by the pressing force of the spring 25.

  As shown in FIG. 3, the fixture 3 includes a U-shaped bolt 31 and nuts 32, 33. The U-shaped bolt 31 is made of mild steel, and the central portion of the curve (arc) is a swing shaft 31a. Yes. As will be described later, the nut 32 is used for tightening, and the nuts 33 and 33 are used as double nuts (for fixing).

  As shown in FIG. 4, the connector 4 has a substantially T-shape, and mounting holes 4 b concentric with the mounting holes 22 e of the cleat 2 are formed at both ends of the base mounting part 4 a (base part). The pedestal portion 22d of the cleat 2 is attached to the attachment portion 4a. The connecting portion 4c (vertical portion) is formed with a slit-shaped (long hole-shaped) bearing portion 4d that supports the swing shaft 31a as will be described later, and this bearing portion 4d extends in the vertical direction. The long hole (longitudinal) direction is perpendicular to the mounting surface of the base mounting portion 4a.

  Next, an example of a procedure for supporting the electric cable C using the cable support 1 having such a configuration will be described. In the present embodiment, a case where the electric cable C is laid vertically from the bottom to the top in a building or a cave (tunnel, manhole, etc.) and the electric cable C is bent and laid at the top will be described. In such a case, the electric cable C is laid as follows using a C-type channel A or the like disposed on the upper part of a wall or a beam in the building.

  First, the U-shaped bolt 31 of the fixture 3 is inserted into the bearing portion 4d of the connector 4, and the swing shaft 31a of the U-shaped bolt 31 is positioned at the bearing portion 4d. Next, nuts 32 are attached to both ends of the U-shaped bolt 31, and both ends of the U-shaped bolt 31 are inserted into mounting holes (not shown) formed in the C-shaped channel A. Then, as shown in FIG. 1, the nuts 33 and 33 are fixed as double nuts and the nut 32 is tightened to attach the fixture 3 to the C-type channel A (fixed). In this attached state, the coupling tool 4 can swing (rotate) about the swing shaft 31a of the mounting tool 3 and can slide in the direction of the long hole of the bearing portion 4d. Further, since the swing shaft 31a has an arc shape, the connecting portion 4c (bearing portion 4d) of the connecting tool 4 always faces toward the top of the arc (the center of the U-shaped bolt 31). Swings and slides stably without lateral displacement.

  By the way, when laying the electric cable C, the laying line is designed in advance, and when the electric cable C is bent and laid at the upper portion as in this embodiment, the bending direction is also determined in advance. For this reason, the U-shaped bolt 31 is positioned so that the bending direction and the axial direction D3 of the swing shaft 31a are orthogonal to each other, and the fixture 3 is attached to the C-type channel A by the above procedure.

  Subsequently, the base portion 22 d of the cleat 2 is aligned with the base mounting portion 4 a of the connector 4, the bolt 6 is inserted into the mounting holes 4 b and 22 e, and the nut 7 is tightened. Thereby, the cleat 2 and the fixture 3 are connected by the connector 4. And in this connected state, the cylindrical axis direction D1 of the grip part of the cleat 2 (the part where the upper grip part 21a and the lower grip part 22a are combined), the long hole direction D2 of the bearing part 4d of the connector 4, and the attachment The axial direction D3 of the oscillating shaft 31a of the tool 3 is always orthogonal to each other. In this procedure, the cleat 2 is attached to the connector 4 after attaching the fixture 3 to the C-shaped channel A, but after attaching the cleat 2 (only the lower body portion 22) to the connector 4, The attachment 3 may be attached to the C-type channel A.

  Next, the electric cable C laid from the bottom to the top is gripped by the cleat 2. That is, the upper body portion 21 is removed from the lower body portion 22 (only the lower body portion 22 may be attached to the connector 4 in advance), the electric cable C is applied to the lower grip portion 22a of the lower body portion 22, and Cover the body 21. Then, the upper body portion 21 and the lower body portion 22 are fastened by the adjusting bolt 23 and the nuts 26 and 26 to grip the electric cable C. At this time, as shown in FIG. 2, the adjustment bolt 23 and the nuts 26 and 26 are adjusted so that the washer 24 is aligned with (is flush with) the upper end surface of the spring accommodating portion 21b. Thereby, even if a cable diameter changes, as mentioned above, the effect that the holding force to the electric cable C is maintained within a certain value is obtained. In this cable gripping state, the direction of the core line in the portion where the electric cable C is gripped (the gripped portion) always coincides with the cylindrical axis direction D1 of the gripping portion of the cleat 2. That is, the core wire direction D1 in the gripped portion of the electric cable C, the long hole direction D2 of the bearing portion 4d, and the axial direction D3 of the swing shaft 31a are always orthogonal to each other.

  Through the above procedure, the electric cable C is supported by the cable support 1 and is suspended from the C-type channel A. In this state, the upper portion of the electric cable C may be bent in a predetermined direction and laid. Here, it is assumed that the electric cable C is bent as shown by a solid line in FIG. Even in such a bent state, the directions D1, D2, and D3 are orthogonal to each other, and the bending direction of the electric cable C and the axial direction D3 of the swing shaft 31a are orthogonal to each other (as described above). The fixture 3 is attached so that the bending direction and the axial direction D3 are orthogonal to each other.

  The laying operation as described above is performed in a state where the electric cable C is not energized. However, when the electric cable C is energized after completion of the laying operation, the electric cable C tends to expand and contract due to Joule heat. For example, when the electric cable C is laid as described above, the electric cable C has a direction as shown by a two-dot broken line in FIG. 1, that is, a direction (illustration) that rises vertically (bending direction) with the cleat 2 as a fulcrum, or Try to expand and contract (swing) in the sleeping direction. At this time, the cleat 2 swings in the direction in which it swings (rotates) about the swing shaft 31a, that is, in the same direction as the direction in which the electric cable C tries to swing. As a result, the electric cable C can freely expand and contract (deform) without being restrained by the cleat 2.

  Moreover, since the cleat 2 is slidable, the degree of freedom of expansion and contraction of the electric cable C is further increased, and the electric cable C can expand and contract without being constrained. That is, when the electric cable C expands and contracts in the direction shown by the two-dot broken line in FIG. 1, the gripped portion of the electric cable C moves in the bending direction (curvature radius direction), that is, in the direction orthogonal to the swing shaft 31a. (Extension / contraction) Although the direction coincides with the long hole direction D2 of the bearing portion 4d, the cleat 2 slides in the long hole direction D2 via the swing shaft 31a. As a result, the electric cable C can be further expanded and contracted (deformed) without being restrained by the cleat 2.

  Thus, the electric cable C can be freely expanded and contracted without being constrained by the cleat 2 even at the bent portion of the electric cable C. Therefore, stress and deformation applied to the electric cable C and the cleat 2 are reduced, and the gripping force of the cleat 2 is maintained within a certain range. As a result, abnormal deformation of the insulating layer of the electric cable C and generation of wrinkles in the copper tape shielding layer are suppressed, and cable damage such as dielectric breakdown can be prevented.

  In the case of the vertical laying as described above, the electric cable C tends to bend in the bending direction (the direction in which the electric cable C is laid in FIG. 1) due to the weight of the electric cable C, and the moment in the bending direction is supported by the cable. Join ingredient 1. However, since the cleat 2 swings and slides in the expansion / contraction (deformation) direction of the electric cable C as in the case of the thermal expansion / contraction, the electric cable C is not restrained by the cleat 2. As a result, damage such as dielectric breakdown due to its own weight can be prevented.

  Such an effect is exhibited not only in the case of the vertical laying as described above but also in the case where the electric cable C is laid horizontally and bent (snake laying). That is, by supporting the bent portion of the electric cable C with the cable support 1, it is possible to prevent dielectric breakdown of the electric cable C due to thermal expansion and contraction. Further, not only the electric cable C but also other insulation-covered cables such as a communication cable are laid, and the cable support 1 can support the cable to prevent the cable from being damaged.

  By the way, in this embodiment, the adapter 5 for cable support tools is attached to the existing cleat 2 in which a holding part does not rock | fluctuate, and the cable support tool 1 is comprised as a whole. Thus, by attaching the adapter 5 to the existing cleat 2, the cable support 1 in which the cleat 2 (gripping part) swings can be obtained. For this reason, the existing cleat (cable support tool) which has abundant kinds and results can be used without causing cable damage to the bent portion of the electric cable C. For example, in the present embodiment, a single-core spring type cleat is used, but depending on the laying conditions, the laying line, etc., a three-row constraining intermediate cleat (cleat that bundles and holds three electric cables C), The adapter 5 can be attached to a triple strip type spring-type cleat (cleat provided with a coil spring in a three-strand constraining type) or the like, and a cable support that swings these cleats can also be configured.

  Of course, the grip portion may be configured without using such an existing cleat, and any structure can be used as long as the electric cable C can be gripped. For example, as shown in FIG. 5, a substantially U-shaped gripping tool 51 may be used. In this case, with the electric cable C attached to the grip 51a of the gripper 51, the base 51b is aligned with the base mount 4a of the connector 4, and bolts (not shown) are inserted into the mounting holes 51c and 4b. Then, it is tightened with a nut (not shown).

  In this embodiment, the fixture 3 is provided with the swing shaft 31a, and the connector 4 is provided with the bearing portion 4d. However, the fixture 3 is provided with a bearing portion, and the connector 4 is provided with the swing shaft. Also good. For example, a fixture 61 and a connector 71 as shown in FIG. That is, the fixture 61 is substantially T-shaped like the above-described connector 4, the bearing portion 61b is formed in the connecting portion 61a (vertical portion), and the mounting portion 61c is attached to the C-type channel A with bolts, nuts, or the like. . On the other hand, the connecting tool 71 is configured with a U-shaped bolt 72 like the mounting tool 3 described above, and the opening pitch (distance between both ends) of the U-shaped bolt 72 is adjusted to the pitch of the mounting holes 22e of the cleat 2. Then, the swing shaft 72a of the U-shaped bolt 72 is inserted into the bearing portion 61b of the fixture 61, and both end portions of the U-shaped bolt 72 are inserted into the mounting holes 22e of the cleat 2, and the double nuts 73, 73 and the nut 74 are inserted. And tighten.

  Furthermore, in this embodiment, since the C-shaped channel A is a cloth object, the U-shaped bolt 31 is used for the fixture 3, but the cloth object is an L-shaped angle material or a flat bar (flat bar). In such a case, a right-angle clevis bolt (a bar having a substantially L shape and a male screw portion formed at the tip) may be used.

  By the way, in this embodiment, the gripping part (cleat 2) swings through the connecting part (connecting tool 4), but the gripping part directly swings with respect to the mounting part without passing through the connecting part. You may make it move. For example, a cable support 8 as shown in FIG. 7 may be used. The cable support 8 has substantially the same configuration as the cleat 2 described above, but differs in configuration from the cleat 2 in that the lower body portion 82 can swing (rotate) with respect to the attachment portion 83. That is, bearing portions 82b and 83a are formed on the lower end portion of the lower gripping portion 82a of the lower body portion 82 and the mounting portion 83, respectively. The bearing portions 82b and 83a are provided with gripping portions (the upper gripping portion 81a of the upper body portion 81). And a swing shaft 84 perpendicular to the cylindrical axis direction of the lower gripping portion 82a) of the lower body portion 82 is inserted. Then, the gripping portion swings with respect to the attachment portion 83 by swinging the lower body portion 82 around the swing shaft 84.

The side view which shows the state which supported the electric cable with the cable support tool which concerns on embodiment of this invention. The front view (partial sectional view) of the grip part (cleat) in the cable support according to the embodiment of the present invention. The front view of the attaching part (attachment tool) in the cable support which concerns on embodiment of this invention. The front view (a) and side view (b) of the connection part (connector) in the cable support which concerns on embodiment of this invention. The front view which shows the other holding part (gripping tool) in the cable support tool which concerns on embodiment of this invention. The front view which shows the other attachment part (attachment tool) and connection part (connection tool) in the cable support which concerns on embodiment of this invention. The front view which shows the other cable support tool of this invention.

Explanation of symbols

1 Cable support 2 Cleat (gripping part)
21a Upper gripping part 22a Lower gripping part 22d Base part 3 Attachment (attachment part)
31a Oscillating shaft 4 connector (connector)
4a Pedestal mounting part 4d Bearing part 5 Cable support adapter A Type C channel (clothing object)
C Electric cable (insulated coated cable)
D1 Core wire direction of gripped part of electric cable D2 Long hole direction of bearing part D3 Axial direction of swing shaft

Claims (2)

A cable support for supporting an insulation-coated cable such as an electric cable or a communication cable along a laying line,
A grip portion for gripping the insulation-coated cable; a mounting portion attached to an object to be installed such as a wall; and a connecting portion for connecting the attachment portion and the grip portion; A pivot shaft whose axis is perpendicular to the direction of the center line is provided on one of the mounting portion or the connecting portion, and a bearing portion for supporting the pivot shaft is provided on the other side. The connecting part is pivotably connected to the mounting part around the center, and
The bearing portion has a slit shape extending in a direction perpendicular to the swinging axis direction of the gripped portion of the insulation-coated cable and the swinging shaft, and the swinging shaft is supported by the bearing portion so as to be relatively slidable. Yes,
A cable support characterized by that. A cable support adapter for attaching a cable support having a gripping portion and a pedestal for gripping an insulation-coated cable such as an electric cable or a communication cable to a construction object such as a wall,
A mounting portion that is attached to the object to be laid, and a connecting portion that connects the mounting portion and the cable support; and a base mounting portion to which the base portion of the cable support is attached is provided in the connecting portion. When the attachment portion and the cable support are connected, a swing shaft whose axis is a direction orthogonal to the direction of the core wire in the gripped portion of the insulation-coated cable is provided on one of the attachment portion and the connection portion. A bearing portion for supporting the swing shaft is provided on the other side, the connecting portion is swingably connected to the mounting portion around the swing shaft, and
The bearing portion has a slit shape extending in a direction perpendicular to the swinging axis direction of the gripped portion of the insulation-coated cable and the swinging shaft, and the swinging shaft is supported by the bearing portion so as to be relatively slidable. Yes,
An adapter for a cable support characterized by that .

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