JP2017216819A - Cable protection tube and connection structure of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable protection tube which enables reduction of a load applied to a separator.SOLUTION: A cable protection tube 1 includes: a protection tube body 10 in which a cable is stored; a separator 20 which extends in a longitudinal direction of the protection tube body 10 and divides an internal space of the protection tube body 10; a joint plate 30 disposed at an end part of the protection tube body 10 and partially protruding from the end part of the protection tube body 10; and connection means S which connects the joint plate 30 to the separator 20 so that the joint plate 30 can move in a longitudinal direction of the protection tube body 10.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a cable protection tube for protecting cables such as a power line and a communication line, and a connection structure thereof.

  Power lines, communication lines, and other cables that have been installed on power poles have been buried in the ground for the purpose of landscape improvement, disaster prevention, and securing road space, etc. Yes. As one of the methods of eliminating the utility pole, there is a method in which a cable is accommodated in a cable protection tube and buried in the ground (wire common groove). In recent years, the use of non-electric poles has been carried out in narrow areas such as under relatively narrow roads.

  A communication cable such as a telephone line is constituted by, for example, a plurality of trunk cables connecting telephone offices and a lead-in cable that is branched from the trunk cable and drawn into a house or a store. When embedding a communication cable in a narrow area, divide one protective tube body with a separator, accommodate the retractable cable at the upper part, insert the trunk cable into the sheath pipe accommodated at the lower part, and embed it in the ground doing. As a result, the pipe structure is made compact, the proportion of the underground space is reduced, and communication cables are buried in narrow areas.

  As disclosed in Patent Document 1, a straight tubular protective tube main body and a curved tubular protective tube main body are usually directly connected, and the separators are connected to each other in a mutually connected state. In particular, in a curved tubular protective tube, a large number of separators made of short plates are connected so as to be capable of relative rotation, and have a curved shape corresponding to the curved tubular protective tube body.

Patent No. 5038942

  In patent document 1, although separators are connected so that rotation is possible, if there is no curved pipe or a lotus pipe, a separator cannot move relatively in the longitudinal direction of a protective tube main body. For this reason, there has been a possibility of being damaged due to an excessive load due to thermal expansion and contraction or an earthquake.

  In order to solve the above-described problems, the present invention provides a cable protection tube, a protection tube body that accommodates a cable, and a separator that extends in a longitudinal direction of the protection tube body and divides an internal space of the protection tube body. A joint plate disposed at an end of the protective tube main body, a part of which protrudes from the end of the protective tube main body, and a connection for connecting the joint plate to the separator movably in the longitudinal direction of the protective tube main body Means.

  According to the above configuration, when the cable protection tube receives a load due to thermal expansion / contraction, earthquake, or the like, relative movement in the longitudinal direction of the protection tube body occurs between the separator and the joint plate at the end of the protection tube body. An excessive load does not act on the battery, and the damage can be avoided.

In one aspect of the connection means, the connection means includes a connection plate provided on one of the joint plate and the separator, and a sliding shaft provided on the other side. A slide hole extending in the longitudinal direction of the protective tube main body is formed, and the slide shaft is slidably held in the slide hole.
In another aspect of the connecting means, the connecting plate includes a connecting plate provided on one of the joint plate and the separator, and a sliding shaft provided on the connecting plate, and the other of the joint plate and the separator. Is formed with a sliding hole extending in the longitudinal direction of the protective tube body, and the sliding shaft is slidably held in the sliding hole.
According to the above configuration, the relative movement of the joint plate and the separator can be realized with a simple configuration of the sliding shaft and the sliding hole.

Preferably, the sliding shaft has a shaft portion and a cylindrical spacer through which the shaft portion is inserted.
According to the above configuration, the spacer can maintain the contact state with the sliding hole regardless of the size of the shaft portion, and the sliding shaft can be slid stably.

Preferably, the sliding hole has a holding portion that is located at an intermediate portion thereof and holds the sliding shaft, and a pair of guide portions that extend from both sides of the holding portion. The sliding shaft has a width smaller than the outer diameter of the shaft, and allows sliding of the sliding shaft with elastic deformation of one or both of the sliding shaft and the guide portion.
According to the above configuration, even if an impact load acts during an earthquake or the like, the impact load can be mitigated by elastic deformation accompanying the movement of the sliding shaft.

  Preferably, the holding portion has a pair of circular arc surfaces in contact with the outer peripheral surface of the sliding shaft. According to this configuration, the sliding shaft can be stably supported in a state where no load is applied.

  Preferably, the protective tube main body is a straight tube, and the separator extends linearly along the protective tube main body. According to this configuration, the manufacturing cost of the cable protection tube can be reduced.

Another aspect of the present invention is a structure for connecting the two cable protection pipes, comprising a connection means for connecting the joint plates of the two cable protection pipes, the connection means having both side portions. The coupling plate overlapped with the two coupling plates, the two coupling plates are coupled via the coupling plate, and at least one coupling plate and the coupling plate include the coupling plate and the coupling plate. It is connected so as to be rotatable around a first axis extending therethrough.
According to the above configuration, the piping direction of the two cable protection tubes can be changed by relatively rotating the joint plate and the connecting plate around the first axis.

  Preferably, the tip edges of the two joint plates opposed to each other have a pair of inclined portions having apexes at the center in the width direction, and form a mountain shape. Movement is regulated.

Preferably, the connecting means has a rotating shaft extending along the first axis, and the rotating shaft includes a shaft portion through which the connecting plate and the insertion hole of the one joint plate are inserted, and the shaft. And a shaft portion of the rotating shaft is longer than a total thickness of the connecting plate and the one joint plate, thereby the two joints. The plate is relatively rotatable about the axis of the protective tube main body and the second axis intersecting the first axis.
According to the above configuration, the separators of the two cable protection tubes are capable of relative rotation about the second axis as well as relative rotation about the first axis. Can be changed not only horizontally but also vertically.

Preferably, it further includes a pair of regulating shafts for regulating the separation in the thickness direction of the connecting plate and the one joint plate, and these regulating shafts are separated from the rotating shaft in the second axial direction and A shaft portion that is disposed on both sides of the rotation shaft, has a shaft portion that is inserted through the through hole of the connection plate and the one joint plate, and has a diameter-enlarged portion for retaining that is formed at both ends of the shaft portion, The shaft portion of the restriction shaft is longer than the total thickness of the connecting plate and the one joint plate, and one of the through hole of the connecting plate and the through hole of the one joint plate is centered on the first axis. A long hole extending along the turning locus of the restriction shaft is formed.
According to the above configuration, the pair of diameter-enlarged portions of the regulating shaft can regulate the separation in the thickness direction between the connecting plate and the one joint plate, and the twist relationship between the pair of joint plates can be suppressed within a predetermined range. And the other joint plate can be prevented from overlapping.

Preferably, the connection plate has inclined first and second contact surfaces at least at a portion corresponding to the one joint plate, and the first contact surface is closer to the center of the connection plate. And is inclined in a direction away from the one joint plate as it advances in the tip direction of the one joint plate, and the second contact surface is located at an end of the connecting plate, The joint plate is inclined in a direction away from the one joint plate as it proceeds in the proximal direction of the joint plate, and the one joint plate is unidirectionally centered on the second axis on the first contact surface. It contacts when it rotates, and contacts the second contact surface when the joint plate rotates in the other direction around the second axis.
According to the said structure, the angle change centering on the 2nd axis line of two cable protection pipes can be controlled to a predetermined range.

Preferably, a cylindrical joint having a taper so that an inner diameter increases from both opening end portions toward the center is provided, and an annular elastic seal member is provided at each opening end portion of the cylindrical joint. The end portions of the two protective tube main bodies are respectively inserted into both open end portions of the cylindrical joint, and are supported by the elastic seal member.
According to the above configuration, the two protective tube main bodies can be coupled so as to be adjustable in angle.

  According to the present invention, when the cable protection tube receives a load due to thermal expansion / contraction, an earthquake, or the like, the load on the separator can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan sectional view schematically showing a cable protection tube according to an embodiment of the present invention, in which the curved plate portions on both sides of a separator and the curved plate portions on both sides of a joint plate are omitted in order to simplify the drawing. It is a cross-sectional view of the cable protection tube. It is a top view which decomposes | disassembles and shows the separator in the same cable protection pipe, a joint board, and the connection board which connects these separators and a joint board. It is a cross-sectional view of the joint plate. It is a cross-sectional view of the connection plate. (A) is a longitudinal sectional view showing a structure in which the separator and the joint plate are connected via a connection plate, (B) is a plan view showing a sliding hole of the connection plate, and (C) is a slide. It is a plane sectional view showing a moving hole and a sliding shaft. It is a plane sectional view showing the connection structure of two cable protection tubes in the embodiment. It is a plane sectional view which decomposes | disassembles and shows the two cable protection tubes and the connection board of a connection structure in the embodiment. In the embodiment, it is a plane sectional view showing a state where two cable protection tubes are bent and connected in the horizontal direction. It is a longitudinal cross-sectional view along the longitudinal direction of a protection tube main body of the connection plate of the said connection structure. It is a longitudinal cross-sectional view which shows the state which connected the coupling plates of two cable protection pipes with the connection board, and shows a rotating shaft and a control shaft on the same cross section.

Hereinafter, the cable protection tube which makes one Embodiment of this invention is demonstrated, referring FIGS.
As shown in FIGS. 1 to 3, the cable protection tube 1 includes a protection tube body 10, a separator 20, a joint plate 30, and connection means S that connects the joint plate 30 to the separator 20.

  The protective tube body 10 is a straight tube made of resin, does not have an enlarged diameter portion at the end, and has a tapered end surface formed on a plain end straight tube obtained by cutting a long straight tube material or on the outer periphery of the tip. Only has a simple shape.

  The separator 20 is a resin plate and extends linearly in the longitudinal direction of the protective tube body 10 to divide the internal space of the protective tube body 10. The separator 20 is slightly shorter than the protective tube main body 10, and both ends in the longitudinal direction are at positions retreated from both ends of the protective tube main body 10.

  As shown in FIG. 2, the separator 20 of the present embodiment has a special cross-sectional shape, a narrow central band portion 21, an inclined plate portion 22 inclined upward from both sides of the central band portion 21, and these inclined portions. A curved plate portion 23 extending downward from the edge of the plate portion 22 and in contact with the inner peripheral surface of the protective tube main body 10 is provided.

  As shown in FIG. 2, many sheaths 11 are accommodated in the lower space 10 a of the protective tube main body 10 divided by the separator 20. A trunk cable (not shown) is inserted into the sheath tube 11. A lead-in cable (not shown) is accommodated in the upper space 10b of the protective tube main body 10.

  The joint plate 30 is made of a resin plate and has a cross-sectional shape similar to that of the separator 20. As shown in FIG. 4, the central strip portion 31, a pair of inclined plate portions 32, and a pair of curved plate portions 33. And have. The joint plate 30 has a proximal end portion connected to the end portion of the separator 20 by the connecting means S, and a distal end portion protruding from the end portion of the protective officer body 10.

The connection means S has a connection plate 40. The connection plate 40 has a rectangular shape in plan view, and has a cross-sectional shape similar to that of the separator 20 and the joint plate 30 (excluding the curved plate portion). As shown in FIG. The inclined plate portion 42 is provided.
The connection plate 40 is in contact with the lower surface (one surface) of the separator 20 and the joint plate 30 and closes the gap between the tip edge of the separator 20 and the base edge of the joint plate 30. The joint plate 30 is disposed on an extension line of the separator 20.

  As shown in FIGS. 1 and 6A, the connection plate 40 is provided at the tip of the separator 20 with two rivets 45. That is, as shown in FIGS. 3 and 6A, a round hole 22a is formed at the tip of the inclined plate portion 22 of the separator 20, and the separator 20 side of the inclined plate portion 42 of the connecting plate 40 is formed. A round hole 42a is also formed in the part, and the connecting plate 40 is fixed to the front end portion of the separator 20 so as to be immovable by a rivet 45 inserted through the round holes 22a and 42a.

  The connecting means S further has two (plural) sliding shafts 46. The sliding shaft 46 includes a rivet 46a and a cylindrical spacer 46b. The rivet 46a has a shaft portion 46x, a head portion 46y (diameter-enlarged portion) on one end side of the shaft portion 46x, and a tip diameter-enlarged portion 46z on the other end side of the shaft portion 46x. A lower portion of the shaft portion 46x is inserted into the spacer 46b.

  The sliding shaft 46 is provided at the base end portion of the inclined plate portion 32 of the joint plate 30. That is, the inclined plate portion 32 is formed with a round hole 32a, and the upper portion of the shaft portion 46x of the sliding shaft 46 is inserted into the round hole 32a.

  As shown in FIGS. 6A and 6B, a sliding hole 47 extending in the longitudinal direction of the protective tube main body 10 is formed in a portion of the inclined plate portion 42 of the connection plate 40 on the joint plate 30 side. . The sliding hole 47 includes a holding portion 47a and a pair of guide portions 47b extending in the longitudinal direction of the protective tube main body 10 from both sides of the holding portion 47a. The holding portion 47a has a pair of arcuate surfaces 47x. The diameter of the circle inscribed in the arc surface 47x is substantially equal to the outer diameter of the spacer 46b. The width of the guide portion 47b is smaller than the outer diameter of the spacer 46b.

The spacer 46b of the sliding shaft 46 is inserted through the sliding hole 47, and is normally held by the holding portion 47a as shown in FIG. 6C. In this state, the arc surface 47x of the holding portion 47a is in contact with the outer peripheral surface of the spacer 46b.
When a load of a predetermined value or more is applied in the longitudinal direction of the protective tube main body 10 between the joint plate 30 and the connection plate 40, the slide shaft 46 is disengaged from the holding portion 47a and can slide to the guide portion 47b. is there. This sliding is accompanied by elastic deformation of the sliding shaft 46 and / or the guide portion 47b.

Next, a structure for connecting the cable protection tubes 1 and 1 having the above-described configuration will be described with reference to FIGS.
The separators 20, 20 of the cable protection tubes 1, 1 are connected by a connecting means R via a joint plate 30.

The connecting means R has a connecting plate 50. The connecting plate 50 has a rectangular shape in plan view, and has a cross-sectional shape similar to that of the connecting plate 40 (a cross-sectional shape in a direction perpendicular to the longitudinal direction of the protective tube main body 10). A plate portion 52 is provided.
The connecting plate 50 is in contact with the lower surface (one surface) of the pair of joint plates 30 and closes the gap between the leading edges of the pair of joint plates 30.

  As shown in FIG. 10, the connecting plate 50 is also characterized by a cross-sectional shape in the longitudinal direction of the protective tube body 10. That is, the connecting plate 50 includes a pair of intermediate contact surfaces 50a spaced apart from each other with the longitudinal center of the protective tube main body 10 interposed therebetween, and a pair of first contact surfaces 50b extending from the intermediate contact surfaces 50a toward the center. A pair of second contact surfaces 50c extending from these intermediate contact surfaces 50a toward both ends are provided.

  As shown in FIG. 11, the first contact surface 50 b of the connecting plate 50 is inclined in a direction away from the joint plate 30 as it advances toward the center, that is, as it advances toward the distal end of the joint plate 30. Yes. The second contact surface 50 c is inclined in a direction away from the joint plate 30 as it proceeds toward both ends, that is, as it proceeds in the proximal direction of the joint plate 30.

  As shown in FIG. 7, the distal ends of the pair of joint plates 30 have a vertical axis (a first axis passing through the joint plate 30 and the connection plate 50) on the connection plate 50 by the rotation shaft 55 at the center in the width direction. It is connected to the center so as to be rotatable (that is, horizontally rotatable).

  The mutually opposing tip edges of the pair of joint plates 30 have a pair of inclined portions 30x whose apexes are the center in the width direction and form a mountain shape. As shown in FIG. 9, relative rotation is restricted by the contact between the inclined portions 30 x of the joint plate 30. Thereby, the horizontal direction change of the cable protection tubes 1 and 1 can be restricted to a predetermined angle range.

  As shown in FIGS. 8 and 11, a round hole 31 a (insertion hole) is formed at the tip of the central band portion 31 of the joint plate 30, and the joint plate 30 is also formed in the central belt portion 51 of the connecting plate 50. The round hole 51a (insertion hole) is formed corresponding to this. As shown in FIG. 11, the rotation shaft 55 includes a rivet 55a and a cylindrical spacer 55b. The rivet 55a includes a shaft portion 55x, a head portion 55y (diameter-enlarged portion) on one end side of the shaft portion 55x, and a tip diameter-enlarged portion 55z on the other end side of the shaft portion 55x. A lower portion of the shaft portion 55x is inserted into the spacer 55b.

  The upper part of the shaft portion 55x of the rotating shaft 55 is inserted into the round hole 31a of the joint 30, and the spacer 55b is inserted into the round hole 51a with play. The length of the shaft portion 55 x of the rotating shaft 55 is longer than the total thickness of the joint plate 30 and the connecting plate 50. Therefore, the joint plate 30 and the connecting plate 50 can be relatively moved in the thickness direction while being regulated by the head portion 55y and the tip enlarged diameter portion 55z.

  As described above, since the joint plate 30 and the connecting plate 50 are relatively movable in the thickness direction (vertical direction), the horizontal axis (second axis) substantially orthogonal to the axis of the protective tube main body 10, that is, the paper surface in FIG. Relative rotation is possible about an axis perpendicular to the axis. When the joint plate 30 rotates in the direction of arrow A in FIG. 11, the rotation of the joint plate 30 is restricted when the tip of the joint plate 30 contacts the first contact surface 50 b of the connecting plate 50. When the joint plate 30 rotates in the direction of arrow B in FIG. 11, the rotation of the joint plate 30 is restricted by the end of the joint plate 30 coming into contact with the second contact surface 50 c of the connecting plate 50. As a result, the direction change in the vertical direction of the cable protection tubes 1 and 1 can be restricted to a predetermined angle range.

  As described above, since the rotation shaft 55 connects the joint 30 and the connection plate 50 with relative movement in the thickness direction, the pair of connection plates 30 rotate relative to each other about the axial direction of the protective tube body 10, There is a possibility of a so-called twist relationship. Therefore, a pair of regulating shafts 56 is used to regulate this twist. The restriction shaft 56 is disposed on both sides of the rotation shaft 55 so as to be separated from the rotation shaft 55 in the second axial direction. Details will be described below.

  As shown in FIGS. 8 and 11, a round hole 32 b (through hole) is formed at the tip of the inclined plate portion 32 of the joint plate 30, and the joint plate 30 is formed in the inclined plate portion 52 of the connecting plate 50. A long hole 52a (through hole) is formed corresponding to the round hole 32b. As shown in FIG. 11, the restriction shaft 56 includes a rivet 56a and a cylindrical spacer 56b. The rivet 56a has a shaft portion 56x, a head portion 56y (expanded diameter portion) on one end side of the shaft portion 56x, and a distal end diameter expanded portion 56z on the other end side of the shaft portion 56x. A lower portion of the shaft portion 56x is inserted into the spacer 56b.

  The upper part of the shaft portion 56x of the restriction shaft 56 is inserted through the round hole 32b of the joint 30, and the spacer 56b is inserted through the long hole 52a. The length of the shaft portion 56 x of the restriction shaft 56 is longer than the total thickness of the joint plate 30 and the connecting plate 50. Therefore, the pair of restriction shafts 56 can restrict the twist to a predetermined angle range while allowing the twist relation of the pair of joint plates 30. As a result, the two joint plates 30 can be avoided from overlapping.

  The elongated hole 52 a extends along the turning locus of the regulating shaft 56 with the turning shaft 55 as the center. Thereby, the joint plate 30 described above allows relative rotation in the horizontal direction.

As shown in FIGS. 7 and 9, the protective tube main bodies 10, 10 of the cable protective tubes 1, 1 are connected via a cylindrical joint 60. The cylindrical joint 60 is tapered such that the inner diameter increases from both opening end portions toward the center. An annular elastic seal member 65 is held in the annular groove 61 formed at the open end of the cylindrical joint 60.
The end portions of the two protective tube bodies 10 and 10 are respectively inserted into the open end portions of the cylindrical joint 60 and supported by the elastic seal member 65. Thereby, the protective tube main bodies 10 and 10 can be angle-adjusted in all directions, and can be relatively moved in the axial direction.

  In the connection structure of the cable protection tubes 1 and 1 having the above-described configuration, the slide shaft 46 moves along the slide hole 47 when the cable protection tube 1 receives a load due to thermal expansion / contraction, earthquake, or the like. A relative movement in the longitudinal direction of the protective tube main body 10 occurs between the joint plate 20 and the joint plate 30. As a result, even if there is no curved pipe or lotus pipe, an excessive load does not act on the separator, and the breakage can be avoided.

The present invention is not limited to the above-described embodiment, and various modifications can be employed without departing from the spirit of the present invention. In the above embodiment, the slide shaft 46 is provided in the joint plate 30 so as not to move, and the connection plate 40 is formed with the slide hole 47. On the contrary, the slide plate 46 is provided in the connection plate 40 so as not to move. A sliding hole may be formed in the joint plate 30.
Furthermore, when the connection plate 40 is provided on the joint plate 30 so as not to move, a sliding shaft may be provided at the tip of the separator 20 and a sliding hole may be formed in the connection plate 40. The connecting plate 40 may be provided with a sliding shaft, and a sliding hole may be formed at the tip of the separator 20.
The connecting plate may be integrated with either the separator or the joint plate.
Even when the pipe line is bent, the protective tube main body 10 is a straight pipe and is angled by the cylindrical joint 60, but some of the protective tube main bodies 10 may be curved pipes.

  In the connection structure of the cable protection tube, in the above embodiment, the connection plate 50 and the two joint plates 30 are rotatably connected, but one joint plate is fixed to the connection plate 50, and the other joint plate is connected. Only the connecting plate 50 may be pivotally connected.

  The present invention can be applied to a cable protection tube buried in the ground.

S connection means R connection means 1 cable protection tube 10 protection tube body 20 separator 30 joint plate 31a round hole (insertion hole)
32b Round hole (through hole)
30x slope
40 Connection plate 46 Slide shaft 46b Spacer 46x Shaft portion 46y, 46z Expanded diameter portion 47 Slide hole 47a Holding portion 47b Guide portion 47x Arc surface 50 Connection plate 50b First contact surface 50c Second contact surface 51a Round hole ( Insertion hole)
52a Long hole (through hole)
55 Rotating shaft 55x Shaft portions 55y, 55z Expanded diameter portion 56 Restriction shaft 56x Shaft portions 56y, 56z Expanded diameter portion 60 Tubular joint 65 Elastic seal member

Claims (13)

  A protective tube main body that accommodates the cable, a separator that extends in the longitudinal direction of the protective tube main body, and divides the internal space of the protective tube main body, and a part of the protective tube main body that is disposed at an end of the protective tube main body. A cable protection tube comprising: a joint plate projecting from an end; and a connecting means for connecting the joint plate to the separator so as to be movable in a longitudinal direction of the protection tube body. The connection means includes a connection plate provided on one of the joint plate and the separator, and a slide shaft provided on the other.
The sliding hole extending in the longitudinal direction of the protective tube main body is formed in the connection plate, and the sliding shaft is slidably held in the sliding hole. Cable protection tube. The connection means includes a connection plate provided on any one of the joint plate and the separator, and a sliding shaft provided on the connection plate.
A sliding hole extending in the longitudinal direction of the protective tube body is formed in the other of the joint plate and the separator, and the sliding shaft is slidably held in the sliding hole. The cable protection tube according to claim 1.   4. The cable protection tube according to claim 2, wherein the sliding shaft includes a shaft portion and a cylindrical spacer through which the shaft portion is inserted. The sliding hole has a holding portion that is located in an intermediate portion thereof and holds the sliding shaft, and a pair of guide portions that extend from both sides of the holding portion,
The guide portion has a width smaller than the outer diameter of the slide shaft, and allows sliding of the slide shaft with elastic deformation of one or both of the slide shaft and the guide portion. The cable protection tube according to any one of claims 2 to 4, wherein   The cable protection tube according to claim 5, wherein the holding portion has a pair of arc surfaces in contact with the outer peripheral surface of the sliding shaft.   The cable protection tube according to any one of claims 1 to 6, wherein the protection tube body is a straight tube, and the separator extends linearly along the protection tube body. A structure for connecting the two cable protection tubes according to any one of claims 1 to 7,
A connecting means for connecting the joint plates of the two cable protection pipes;
The connecting means includes a connecting plate having both sides overlapped with the two joint plates, the two connecting plates are connected via the connecting plate, and at least one of the connecting plates and the connecting plate are connected to each other. A connection structure for a cable protection tube, wherein the connection structure is pivotally connected about a first axis passing through the joint plate and the connection plate.   The leading edges of the two joint plates facing each other have a pair of inclined portions with the center in the width direction as apexes, forming a mountain shape, and relative rotation is restricted by the contact between the inclined portions of the joint plates. The connection structure for a cable protection tube according to claim 8, wherein the connection structure is a cable protection tube. The connecting means has a rotating shaft extending along the first axis, and the rotating shaft includes a shaft portion through which the connecting plate and the one coupling plate are inserted, and both ends of the shaft portion. And a diameter-enlarged portion for retaining to be formed on the
The shaft portion of the rotating shaft is longer than the total thickness of the connecting plate and the one joint plate, whereby the two joint plates are a second axis that intersects the axis of the protective tube main body and the first axis. The cable protection tube connection structure according to claim 8, wherein the cable protection tube can be relatively rotated around the center. Furthermore, a pair of restricting shafts for restricting the separation in the thickness direction of the connecting plate and the one joint plate are provided, and these restricting shafts are separated from the rotating shaft in the second axial direction and the rotating shaft. A shaft portion that is disposed on both sides of the connecting plate and the through hole of the one joint plate, and has a diameter-enlarged portion for retaining that is formed at both ends of the shaft portion,
The shaft portion of the restriction shaft is longer than the total thickness of the connecting plate and the one joint plate, and one of the through hole of the connecting plate and the through hole of the one joint plate is centered on the first axis. The connection structure for a cable protection tube according to claim 10, wherein an elongated hole extending along a turning locus of the restriction shaft is formed. The connecting plate has inclined first and second contact surfaces at least at a portion corresponding to the one joint plate,
The first contact surface is located closer to the center of the connecting plate, and is inclined in a direction away from the one joint plate as it advances in the distal direction of the one joint plate,
The second contact surface is located at an end portion of the connecting plate and is inclined in a direction away from the one joint plate as it proceeds in a proximal direction of the one joint plate,
The one abutting plate abuts on the first abutting surface when the one coupling plate rotates in one direction around the second axis, and the abutting plate abuts on the second axis. The connection structure for a cable protection tube according to claim 11, wherein the contact structure is brought into contact with the cable protection tube when rotated in the other direction. Furthermore, it comprises a cylindrical joint that tapers such that the inner diameter increases from both open ends toward the center,
An annular elastic seal member is provided at each of the opening ends of the cylindrical joint,
The end portions of the two protective tube bodies are respectively inserted into both open end portions of the cylindrical joint and supported by the elastic seal member. Connection structure of cable protection tube.

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