Cable duct

Abstract

To provide a cable duct which can be conveyed to an installation site to be assembled.SOLUTION: A cable duct CD is an assembly type cable duct, which comprises: a first plate-like member 10; a second plate-like member 20; a third plate-like member 30; and fourth plate-like members 50a, 50b each extending in one direction, the inside of which a wiring space S1 through which a cable passes is formed by the first plate-like member 10, the second plate-like member 20, the third-plate like member 30, and the fourth plate-like members 50a, 50b, an inserted space S2 is formed in the second plate-like member 30, and the first plate-like member 20 has a projection 14 to be inserted into the inserted space S2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cable duct. [Background technology]

[0002] Patent Document 1 describes a wiring duct that is configured so that fitting and engaging portions formed on the bottom wall and near both left and right ends can be fitted into and connected to fitting-engaged portions formed on the lower ends of the left and right side walls that are made separately from the bottom wall, and has covers attached to the upper edges of the left and right side walls.

[0003] Patent Document 2 describes a wiring duct in which recessed grooves or protruding edges are formed on both sides of a bottom wall member along the longitudinal direction of the duct, and protruding edges or recessed grooves that fit into the recessed grooves or protruding edges are formed on the bottom edge, and the duct side walls are configured by arranging side wall pieces whose longitudinal length is approximately the same as the size of the electric wire withdrawal hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Jikko No. 50-039428 [Patent Document 2] Jikko No. 56-019564 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a cable duct that can be transported to and assembled at an installation site. [Means for solving the problem]

[0006] The invention described in claim 1 is an assembly-type cable duct comprising a first plate-shaped member, a second plate-shaped member, a third plate-shaped member, and a fourth plate-shaped member each extending in one direction, wherein a wiring space through which a cable passes is formed inside by the first plate-shaped member, the second plate-shaped member, the third plate-shaped member, and the fourth plate-shaped member, but, Inserted space of formation the first space forming portion and the second space forming portion are arranged at intervals in the width direction of the second plate-like member, the third space forming portion and the fourth space forming portion are arranged at intervals in the thickness direction of the second plate-like member, the fourth space forming portion is constituted by a first protruding plate that protrudes inward in the width direction of the second plate-like member and a second protruding plate that protrudes outward in the width direction of the second plate-like member, and a gap is formed between a tip end surface of the first protruding plate and a tip end surface of the second protruding plate, The first plate-like member is a cable duct having a protrusion to be inserted into the insertion space.

[0007]

[0008] Claim 2 The invention described in claim 1 In the cable duct described, the protrusion portion has a first protrusion that passes through the gap and a second protrusion that passes through the gap, and the first protrusion and the second protrusion are arranged so as to be substantially symmetrical.

[0009] Claim 3 The invention described in claim 1 In the cable duct described above, the protrusion portion has a first protrusion formed to fit along the lower end of the third space forming portion, the first space forming portion, and the first protruding plate and pass through the gap, and a second protrusion formed to fit along the upper end of the third space forming portion, the second space forming portion, and the second protruding plate and pass through the gap, and the first protrusion and the second protrusion are arranged so as to be substantially symmetrical.

[0010] Claim 4 The invention described in claim 1 In the cable duct described above, the first plate-shaped member further has a protrusion base that protrudes in the thickness direction of the first plate-shaped member and has the protrusion provided thereon, and the second plate-shaped member further has a reinforcing portion that is provided widthwise inside the first plate-shaped member with a gap between it and the second protruding plate and has a tip that faces toward the first plate-shaped member, and the upper end of the protrusion base fits between the reinforcing portion and the second protruding plate, and the second protruding plate fits between the protrusion base and the protrusion.

[0011] Claim 5 The invention described in claim 4 In the described cable duct, the first protruding plate is fitted between the lower end of the protruding base and the protruding portion.

[0012] Claim 6 The invention described in claim 1 ~ 5 In the cable duct described in any one of the above, the fourth plate-shaped member has a wiring space forming portion facing the wiring space and covering portions provided at both widthwise ends of the wiring space forming portion and covering the outside of the upper ends of the second plate-shaped member and the third plate-shaped member, and the wiring space forming portion has a rib on its surface facing the wiring space, and the upper end of the second plate-shaped member is located between the rib and the covering portion.

[0013] Claim 7 The invention described in claim 6 In the described cable duct, the height of the rib decreases from the top of the rib toward the outside in the width direction of the fourth plate-shaped member.

[0014] Claim 8 The invention described in claim Any one of 1 to 5 In the cable duct described, the first plate-shaped member has a first outer plate portion located on the outside and a first inner plate portion arranged inside the first outer plate portion at a distance.

[0015] Claim 9 The invention described in claim Any one of 1 to 5 In the cable duct described, the second plate-shaped member has a second outer plate portion located on the outside and a second inner plate portion arranged inside the second outer plate portion at a distance.

[0016] Claim 10 The invention described in claim Any one of 1 to 5 In the described cable duct, the first plate-shaped member, the second plate-shaped member, the third plate-shaped member and the fourth plate-shaped member are each made of polycarbonate. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a cable duct that can be transported to an installation site and assembled there. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an external view of a cable duct according to an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. 3 is a partial enlarged view of part A shown in FIG. [Figure 4A] 3 is a partial enlarged view of part A shown in FIG. 2, showing a first protrusion portion. FIG. [Figure 4B] 3 is a partial enlarged view of part A shown in FIG. 2, showing a space forming part. FIG. [Figure 5A] FIG. [Figure 5B] 3 is a cross-sectional view of the cover plate taken along the line XX shown in FIG. 2. [Figure 6A] FIG. 5C is a partially enlarged view of part B shown in FIG. 5B. [Figure 6B] FIG. 5C is a partially enlarged view of part C shown in FIG. 5B. DETAILED DESCRIPTION OF THE INVENTION

[0019] Next, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. Note that in the drawings, parts that are not relevant to the description may be omitted.

[0020] A cable duct CD according to an embodiment of the present invention accommodates, for example, a cable for a railway and is installed outdoors, such as on a bridge. The cable duct CD is an assembly type that can be transported to the installation site and assembled by workers.

[0021] As shown in Fig. 1, the cable duct CD is in the shape of a square tube and includes a bottom plate 10, side plates 20, 30, and cover plates 50a and 50b, which form an internal wiring space S1 (see Fig. 2) through which cables pass. The bottom plate 10, side plates 20, 30, and cover plates 50a and 50b are each integrally formed.

[0022] As shown in FIG. 2, the bottom plate (an example of a first plate-like member) 10 is a plate-like member that is located below the cable duct CD and extends in one direction. The bottom plate 10 has an outer plate portion 102 and an inner plate portion 104, and has a double structure. The outer plate portion (an example of a first outer plate portion) 102 is located on the bottom side (outside) of the bottom plate 10, and is a plate-like member having a predetermined thickness. The inner plate portion (an example of a first inner plate portion) 104 is a plate-like member having a predetermined thickness, and is arranged inside the outer plate portion 102 with a gap therebetween. The outer plate portion 102 and the inner plate portion 104 are connected to each other by a plurality of reinforcing portions 106. Each reinforcing portion 106 extends in the longitudinal direction of the bottom plate 10 and is provided at intervals in the left-right direction (the width direction of the bottom plate 10).

[0023] The bottom plate 10 further has a first protrusion base 12 and a first protrusion 14, and a second protrusion base 16 and a second protrusion 18, at both ends in the width direction, respectively. Because the bottom plate 10 is substantially symmetrical, the first protrusion base 12 and the first protrusion 14 have substantially the same shapes as the second protrusion base 16 and the second protrusion 18, respectively. Therefore, hereinafter, only the first protrusion base 12 and the first protrusion 14 shown in Fig. 3 will be described, and a description of the second protrusion base 16 and the second protrusion 18 will be omitted.

[0024] The first protrusion base 12 is a plate-like member having a predetermined thickness that protrudes upward (inward) in the thickness direction of the bottom plate 10 from the end of the outer plate portion 102. The first protrusion base 12 extends in the longitudinal direction of the bottom plate 10.

[0025] The first protrusion 14 is provided on a first protrusion base 12 that protrudes in the thickness direction of the bottom plate 10, and protrudes outward in the width direction of the bottom plate 10. The first protrusion 14 extends in the longitudinal direction of the bottom plate 10. As shown in Fig. 4A, the first protrusion 14 has a lower protrusion 14a and an upper protrusion 14b that are provided so as to be vertically symmetrical. Note that "vertically symmetrical" here does not mean vertically symmetrical in the strict sense. In other words, "vertically symmetrical" means "substantially vertically symmetrical" while allowing for design and manufacturing errors (the same applies hereinafter).

[0026] The lower protrusion (an example of a first protrusion) 14a is made up of at least protrusion forming portions 142a, 144a, 146a, and 148a. The protrusion forming portions 142a, 144a, 146a, and 148a each extend in the longitudinal direction of the bottom plate 10.

[0027] The protrusion forming portion 142a is plate-shaped and is provided so as to protrude outward in the width direction of the bottom plate 10 from the first protrusion base portion 12. The protrusion forming portion 144a is plate-shaped and is provided so as to protrude downward (outward in the thickness direction of the bottom plate 10) from the tip of the protrusion forming portion 142a. The protrusion forming portion 146a is plate-shaped and is provided so as to protrude outward in the width direction of the bottom plate 10 from the tip of the protrusion forming portion 144a. The protrusion forming portion 148a is plate-shaped and is provided so as to protrude upward (inward in the thickness direction of the bottom plate 10) from the tip of the protrusion forming portion 146a.

[0028] The upper protrusion (an example of a second protrusion) 14b is disposed above the lower protrusion 14a at a distance from the lower protrusion 14a, and is composed of at least protrusion forming portions 142b, 144b, 146b, and 148b. The protrusion forming portions 142b, 144b, 146b, and 148b each extend in the longitudinal direction of the bottom plate 10.

[0029] The protrusion forming portion 142b is plate-shaped and is provided so as to protrude outward in the width direction of the bottom plate 10 from the first protrusion base portion 12. The protrusion forming portion 144b is plate-shaped and is provided so as to protrude upward (inward in the thickness direction of the bottom plate 10) from the tip of the protrusion forming portion 142b. The protrusion forming portion 146b is plate-shaped and is provided so as to protrude outward in the width direction of the bottom plate 10 from the tip of the protrusion forming portion 144b. The protrusion forming portion 148b is plate-shaped and is provided so as to protrude downward (outward in the thickness direction of the bottom plate 10) from the tip of the protrusion forming portion 146b.

[0030] In addition, the height dimension L1 of the first protrusion portion 14 (dimension L1 from the lower surface of the protrusion forming portion 146a to the upper surface of the protrusion forming portion 146b) is set to be larger than the dimension L2 from the lower surface of the outer plate portion 102 to the upper surface of the inner plate portion 104.

[0031] The side plate (an example of a second plate-like member) 20 is a plate-like member that extends in one direction and forms one side surface of the cable duct CD, as shown in FIG.

[0032] As shown in FIG. 2, the side panel 20 has an outer panel portion 202 and an inner panel portion 204, and a portion of the side panel 20 has a double structure. The outer plate portion (an example of a second outer plate portion) 202 is located on the outside and is a plate-like member having a predetermined thickness. The inner plate portion (an example of a second inner plate portion) 204 is a plate-like member having a predetermined thickness, and is arranged inside the outer plate portion 202 with a gap therebetween. The outer plate portion 202 and the inner plate portion 204 are connected to each other by a plurality of reinforcing portions 206. Each reinforcing portion 206 extends in the longitudinal direction of the side panel 20 and is provided at intervals in the vertical direction (the width direction of the side panel 20).

[0033] The side panel 20 further includes a connecting portion 210 and an upper end forming portion 220, each extending in the longitudinal direction. The connecting portion 210 is a member that connects the outer plate portion 202 and the inner plate portion 204 at the upper ends of the outer plate portion 202 and the inner plate portion 204. A plurality of grooves 212 extending in the longitudinal direction of the side plate 20 are formed at intervals in the longitudinal direction on the outer side of the connecting portion 210. The upper end forming portion 220 is a plate-like member that extends further upward from the connecting portion and has a predetermined thickness.

[0034] 4B, the side panel 20 further has, at its lower end, space forming portions 250, 252, 254, 256 that form the insertion space S2, and a reinforcing portion 260. The insertion space S2 is a rectangular parallelepiped space extending in the longitudinal direction of the side panel 20, and the first protrusion 14 is inserted into the insertion space S2. The space forming portion (an example of a first space forming portion) 250 is plate-shaped and forms the bottom surface of the side panel 20. The space forming portion (an example of a second space forming portion) 252 is plate-shaped and is disposed above the space forming portion 250 with a gap therebetween. The space forming portion 252 connects the outer plate portion 202 and the inner plate portion 204. The space forming portion (an example of a third space forming portion) 254 is plate-shaped, is disposed on the outside of the side panel 20, and connects the space forming portion 250 and the space forming portion 252. The space forming portion (an example of a fourth space forming portion) 256 is disposed at an interval from the space forming portion 254 and is located more inward in the thickness direction of the side panel 20 than the space forming portion.

[0035] The space forming portion 256 is composed of a first protruding plate 256a and a second protruding plate 256b which form a gap g1 between their tip surfaces, the first protruding plate 256a protruding upward (inward in the width direction of the side panel 20) and the second protruding plate 256b protruding downward (outward in the width direction of the side panel 20). The reinforcing portion 260 is provided on the inner side in the width direction of the bottom plate 10 at a distance from the second protruding plate 256b, with its tip pointing toward the bottom plate 10 (see FIG. 3).

[0036] Here, the first protrusion 14 inserted into the insertion space S2 will be described below with reference to FIG. The lower protrusion 14a of the first protrusion portion 14 is inserted into the inserted space S2 so that the protrusion forming portion 148a, the protrusion forming portion 146a and the protrusion forming portion 144a are positioned along the lower end of the space forming portion 254, the space forming portion 250 and the first protruding plate 256a, respectively, and the protrusion forming portion 142a passes through the gap g1 (see Figure 4B). The upper protrusion 14b of the first protrusion 14 is inserted into the inserted space S2 so that the protrusion forming portion 148b, the protrusion forming portion 146b and the protrusion forming portion 144b are positioned along the upper end of the space forming portion 254, the space forming portion 252 and the second protruding plate 256b, respectively, and the protrusion forming portion 142b passes through the gap g1 (see Figure 4B). Furthermore, the upper end of the first protrusion base 12 fits between the reinforcing portion 260 and the second protrusion plate 256b, and the second protrusion plate 256b fits between the first protrusion base 12 and the protrusion forming portion 144b. Furthermore, the first protruding plate 256a is fitted between the lower end of the first protrusion base 12 and the protrusion forming portion 144a of the lower protrusion 14a.

[0037] The side plate (an example of a third plate-like member) 30 is a plate-like member that extends in one direction and forms the other side of the cable duct CD, as shown in Figure 1, and is connected to the bottom plate 10 by inserting the second protrusion portion 18, as shown in Figure 2. The side panel 30 is formed to be substantially symmetrical to the side panel 20, and therefore a detailed description thereof will be omitted.

[0038] The cover plates 50a and 50b (an example of a fourth plate-like member) are each a plate-like member extending in one direction, and are arranged side by side above the cable duct CD, as shown in Fig. 1. The cover plates 50a and 50b form a pair and function as a cover for the cable duct CD. Here, since the cover plates 50a and 50b have substantially the same shape, only the cover plate 50a will be described, and a description of the cover plate 50b will be omitted.

[0039] As shown in FIG. 2, the cover plate 50a has an upper plate portion 52 and a cover portion . The upper plate portion (an example of a wiring space forming portion) 52 is plate-shaped and faces the wiring space S1. A plurality of protrusions (not shown) are formed on the surface (upper surface) of the upper plate portion 52. These protrusions function as anti-slip pads when a worker stands on the cable duct CD. As shown in FIGS. 5A and 5B, a plurality of ribs 522 are provided at both widthwise ends of the rear surface (surface on the wiring space S1 side) of the upper plate portion 52 at intervals in the longitudinal direction.

[0040] Each rib 522 is composed of a pair of plate-shaped reinforcing members 522a, 522b. The reinforcing members 522a, 522b are substantially symmetrical in shape, connected at their outer ends, and arranged to spread inward at a predetermined angle in plan view. 6A and 6B, the reinforcing members 522a, 522b each have a peak V where the height (the distance from the lower surface of the upper plate portion 52 to the tip of the reinforcing members 522a, 522b) is maximum. The height L3 (the dimension from the lower surface of the upper plate portion 52 to the tip of the rib 522) (see FIG. 2) of each rib 522 gradually decreases from the peak V toward the outer side in the width direction (the end portion in the width direction) of the cover plate 50a.

[0041] A connecting portion 524a (see FIG. 6A) and a connected portion 524b (see FIG. 6B) are provided at both longitudinal ends of the upper plate portion 52. The connecting portion 524a and the connected portion 524b are protrusions for connecting another cover plate.

[0042] As shown in FIG. 2, the cover portions 54 are plate-shaped and are provided at both widthwise ends of the upper plate portion 52, respectively, and cover the outside of the upper end portions of the side plates 20 and 30. A gap is provided between the cover portion 54 and the rib 422, and the upper end of the side plate 20 and the upper end of the side plate 30 are positioned in this gap.

[0043] 5A and 5B, a plurality of projections 542 are formed at the lower end of the cover portion 54, protruding inward and extending in the longitudinal direction of the cover plate 50a at intervals in the longitudinal direction. These projections 542 fit into grooves 212 (see FIG. 2) formed in the side panel 20 and grooves formed in the side panel 30, respectively.

[0044] From the viewpoint of strength and weather resistance, the material of the bottom plate 10, the side plate 20, the side plate 30 and the cover plates 50a, 50b is preferably polycarbonate, for example.

[0045] Next, a method for assembling the cable duct CD will be described. The cable duct CD is assembled in accordance with the following steps P1 to P5. However, if possible, some steps may be performed in parallel.

[0046] (Process P1) A worker carries the bottom plate 10, the side plate 20, the side plate 30, and the cover plates 50a, 50b to the installation site of the cable duct CD. The bottom plate 10, the side plate 20, the side plate 30, and the cover plates 50a, 50b are each plate-shaped and made of, for example, polycarbonate, making them lightweight, which reduces the burden of carrying them in.

[0047] (Process P2) The worker inserts the longitudinal end of the first protrusion 14 of the bottom panel 10 into the longitudinal end of the insertion space S2 of the side panel 20 and moves the side panel 20 longitudinally relative to the bottom panel 10, thereby connecting the side panel 20 to the bottom panel 10. After the bottom plate 10 and the side plate 20 are connected, the bottom plate 10 and the side plate 30 are connected in the same manner. To make.

[0048] At this time, in addition to the first protrusion portion 14 being inserted into the insertion space S2, as described above, the reinforcing portion 260 and the second protrusion plate 256b, which have surfaces whose normal direction is the thickness direction of the side panel 20, fit together so as to interlock with the upper end portion of the first protrusion base 12 and the protrusion forming portion 144b, and the first protrusion plate 256a fits between the lower end portion of the first protrusion base 12 and the protrusion forming portion 144a of the first protrusion portion 14, so that the necessary strength is maintained for the bottom panel 10 and the side panel 20 after connection. Similarly, the strength required for the bottom panel 10 and the side panel 30 after connection is maintained.

[0049] (Process P3) The side panels 20 and 30 are connected to the bottom panel 10, and the semi-assembled cable duct, which is open at the top, is fixed in place. Multiple semi-assembled cable ducts are installed in the longitudinal direction according to the required length.

[0050] (Process P4) The cable is laid inside the semi-assembled cable duct.

[0051] (Process P5) After the cables are laid, the cover plates 50a and 50b are fitted. At this time, even if the side panels 20 and 30 are slightly tilted inward, the dimension L3 (see FIG. 2) becomes smaller from the top V toward the outside of the cover panels 50a and 50b, so the upper end forming portion 220 of the side panel 20 and the upper end forming portion of the side panel 30 fit between the rib 522 and the cover portion 54, and the cover panels 50a and 50b are easily attached. In other words, the provision of the rib 522 not only improves the rigidity of the cover panels 50a and 50b, but also allows the cover panels 50a and 50b to be attached smoothly. The attached cover plates 50a, 50b are fixed by metal fittings (not shown) at the connection portions of the respective cable ducts CD.

[0052] In this way, the cable duct CD can be transported to the installation site and assembled.

[0053] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not depart from the gist of the present invention are within the scope of application of the present invention.

[0054] The cable duct CD in the above-described embodiment may be installed so that the bottom plate 10 and the cover plates 50a, 50b are positioned on the left and right, i.e., rotated 90 degrees around an axis extending in the longitudinal direction from the state shown in Figure 2, and the orientation of the cable duct is not limited. Alternatively, only one of the side panels may be connected to the bottom panel 10, and the other side panel may be formed integrally with the bottom panel 10. [Explanation of symbols]

[0055] 12 First protrusion base 14 First protrusion 14a Lower protrusion 14b Upper projection 16 Second protrusion base 18 Second protrusion 10 Bottom plate 20 Side plate 30 Side plate 50a, 50b lid plate 52 Upper plate 54 Cover 102 Outer plate part 104 Inner plate part 106 Reinforcement 142a, 142b Protrusion forming part 144a, 144b Protrusion forming part 146a, 146b Protrusion forming part 148a, 148b Protrusion forming part 202 Outer plate part 204 Inner plate part 206 Reinforcement 210 Connection 212 Groove 220 Upper end forming part 250, 252, 254, 256 Space forming part 256a First protruding plate 256b Second protruding plate 260 Reinforcement 522 Ribs 522a, 522b Reinforcing members 524a Connection part 524b Connected part 542 Protrusion S1 wiring space S2 Inserted space CD Cable Duct g1 gap V top

Claims

1. a first plate-shaped member, a second plate-shaped member, a third plate-shaped member, and a fourth plate-shaped member each extending in one direction; An assembly-type cable duct in which a wiring space through which a cable passes is formed by the first plate-shaped member, the second plate-shaped member, the third plate-shaped member, and the fourth plate-shaped member, an insertion space is formed in the second plate-like member, The cable duct has a protrusion on the first plate-like member that is inserted into the insertion space.

2. The cable duct according to claim 1, the second plate-like member has first to fourth space forming portions that form the insertion space, the first space forming portion and the second space forming portion are arranged at an interval in the width direction of the second plate-shaped member, the third space forming portion and the fourth space forming portion are arranged at intervals in a thickness direction of the second plate-shaped member, the fourth space forming portion is composed of a first protruding plate protruding inward in the width direction of the second plate-like member and a second protruding plate protruding outward in the width direction of the second plate-like member, A cable duct in which a gap is formed between the tip end surface of the first protruding plate and the tip end surface of the second protruding plate.

3. The cable duct according to claim 2, The protruding portion includes a first protrusion passing through the gap; a second protrusion passing through the gap; The cable duct, wherein the first protrusion and the second protrusion are provided substantially symmetrically.

4. The cable duct according to claim 2, the protruding portion is a first protrusion formed along a lower end portion of the third space forming portion, the first space forming portion, and the first protruding plate and passing through the gap; a second protrusion formed along an upper end of the third space forming portion, the second space forming portion, and the second protruding plate and passing through the gap, The cable duct, wherein the first protrusion and the second protrusion are provided substantially symmetrically.

5. The cable duct according to claim 2, the first plate-shaped member further includes a protrusion base portion that protrudes in a thickness direction of the first plate-shaped member and on which the protrusion portion is provided, the second plate-shaped member further includes a reinforcing portion that is provided on the inside of the first plate-shaped member in the width direction at a distance from the second protruding plate and whose tip faces the first plate-shaped member, A cable duct in which the upper end of the protrusion base fits between the reinforcing portion and the second protrusion plate, and the second protrusion plate fits between the protrusion base and the protrusion.

6. The cable duct according to claim 5, A cable duct in which the first protruding plate is fitted between the lower end of the protruding base and the protruding portion.

7. The cable duct according to any one of claims 3 to 6, the fourth plate-shaped member has a wiring space forming portion facing the wiring space; a cover portion provided at each of both widthwise ends of the wiring space forming portion and covering the outside of the upper ends of the second plate-shaped member and the third plate-shaped member, the wiring space forming portion has a rib on a surface on the side of the wiring space, A cable duct in which the upper end of the second plate-shaped member is located between the rib and the cover portion.

8. The cable duct according to claim 7, A cable duct in which the height of the rib decreases from the top of the rib toward the outside in the width direction of the fourth plate-shaped member.

9. The cable duct according to claim 8, The first plate-shaped member includes a first outer plate portion located on an outer side; a first inner plate portion disposed inside the first outer plate portion and spaced apart from the first inner plate portion.

10. 10. The cable duct according to claim 9, The second plate-shaped member includes a second outer plate portion located on the outside, a second inner plate portion disposed inside the second outer plate portion and spaced apart from the second inner plate portion.

11. The cable duct according to claim 10, The cable duct, wherein the first plate-shaped member, the second plate-shaped member, the third plate-shaped member, and the fourth plate-shaped member are each made of polycarbonate.

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