Trough body and underground cable installation method using said trough body

Abstract

To provide a technique capable of effectively promoting cable burying.SOLUTION: A trough 10 has a function as a drain side ditch and a function for housing cables. The trough 10 comprises a trough body 11 including a bottom wall 12, a pair of side walls 13, 14, and an upper wall 17 and a panel member 30 which extends across the pair of side walls 13, 14 and of which the top face has cables 50. In the interior space of the trough body 11, a space under the panel member 30 functions as a drain space S1 and a space over the panel member 30 functions as a cable housing space S2.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a trough body and a method for laying cables underground using the trough body. [Background technology]

[0002] In recent years, with the aim of improving the landscape of urban areas and ensuring safety in the event of a disaster, progress has been made in underground electric cables, eliminating utility poles along roads by storing various cables such as power transmission cables, communication cables, and optical fiber cables in utility cable trenches and burying them underground. For such utility cable trenches, structures made of precast concrete or synthetic resin are used (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-150460 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-061997 Summary of the Invention [Problem to be solved by the invention]

[0004] Electric utility tunnels are generally buried under sidewalks. For this reason, on narrow roads with short sidewalks or no sidewalks, for example, it is difficult to secure sufficient space to bury the electric utility tunnel, making it difficult to bury the cables underground. In addition, electric utility tunnels are expensive to build, and installing them on roads requires construction and maintenance that involves road closures, which is another issue.

[0005] Meanwhile, drainage gutters are installed at the sides of roads to drain rainwater, etc. If these drainage gutters could also be used as utility conduits for electric cables, it is expected that undergrounding of electric cables can be promoted more effectively even on roads with short sidewalk widths or narrow roads.

[0006] Furthermore, with the recent increase in demand for electric vehicles, there is a demand for the installation of in-motion power supply systems that supply power to vehicles while they are in motion. If drainage ditches could also be used as utility conduits for electric cables, it would be possible to provide roads with additional functions, such as effectively transmitting power to in-motion power supply systems, and this is expected to contribute to the spread of electric vehicles and technological advances.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a technology that can effectively promote the undergrounding of electric wires while ensuring drainage. [Means for solving the problem]

[0008] The trough body of the present disclosure is a trough body that functions as a drainage gutter and has the function of storing cables, and comprises a trough body having an internal space defined by a bottom wall portion, a pair of opposing side wall portions, and an upper wall portion, and a panel member that is hung between the pair of side wall portions and has the cables laid on its upper surface, and is characterized in that of the internal space of the trough body, the space below the panel member functions as a drainage channel space, and the space above the panel member functions as a cable storage space.

[0009] It is also preferable that drainage holes are formed through the bottom wall portion and / or the pair of side wall portions to discharge water in the drainage channel space to the outside of the trough body.

[0010] It is also preferable that the panel further includes protrusions that protrude upward from the bottom wall portion, face the inner surfaces of the pair of side wall portions, and divide at least a portion of the drainage channel space into a first drainage channel and a second drainage channel, and that the protrusions support the underside of the panel member on which the cables are laid.

[0011] It is also preferable that the panel member be formed in a porous or mesh-like shape that allows water to pass through.

[0012] It is also preferable that the storage unit further comprises a locking mechanism for locking the end of the panel member to the inner surface of the side wall portion.

[0013] It is also preferable that the cable storage device further comprises a partition plate attached to the upper surface of the panel member and dividing the cable storage space into a first storage space for high-voltage cables and a second storage space for low-voltage cables.

[0014] It is also preferable that the upper wall portion is formed separately from the trough body and is a lid member that can be fitted between the upper ends of the pair of side wall portions.

[0015] It is also preferable that the cover member is provided with a water-permeable anti-slip member that allows water to pass from the upper surface to the lower surface of the cover member.

[0016] It is also preferable that the trough body is made of synthetic resin.

[0017] The method disclosed herein is a method for burying cables using the trough body, and is characterized by the steps of placing and burying the trough body in a trench excavated at the side edge of a road, attaching the panel member to the inside of the trough body, and passing the cables through the space above the panel member within the trough body and laying them on the top surface of the panel member. [Effects of the Invention]

[0018] According to the technology of the present disclosure, it is possible to effectively promote the undergrounding of electric wires. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a schematic exploded perspective view showing a trough body according to the present embodiment. [Figure 2] FIG. 10 is a schematic perspective view showing another example of a curved trough body according to the present embodiment. [Figure 3] FIG. 10 is a schematic perspective view showing another example of the trough body according to the present embodiment. [Figure 4] 1 is a schematic perspective view showing a connection structure in which a plurality of trough bodies according to the present embodiment are connected together. FIG. [Figure 5] FIG. 2 is a schematic cross-sectional view showing a trough body according to the present embodiment. [Figure 6] FIG. 2 is a schematic diagram illustrating a first step of a method for laying cables underground using a trough body according to the present embodiment. [Figure 7] 4 is a schematic diagram illustrating a second step of the underground cable installation method using the trough body according to the present embodiment. FIG. [Figure 8] 10 is a schematic diagram illustrating a third step of the underground cable installation method using the trough body according to the present embodiment. FIG. [Figure 9] FIG. 10 is a schematic diagram illustrating the fourth step of the underground cable installation method using the trough body according to this embodiment. [Figure 10] FIG. 10 is a schematic perspective view showing a trough body according to another embodiment. [Figure 11] FIG. 10 is a schematic perspective view showing a protruding portion of a trough body according to another embodiment, with a portion of the trough body cut away. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a trough body according to this embodiment and a method for laying cables underground using the trough body will be described with reference to the accompanying drawings. Identical components are designated by identical reference numerals, and their names and functions are also identical. Therefore, detailed descriptions thereof will not be repeated.

[0021] [Trough body] 1 is a schematic exploded perspective view showing a trough body 10 according to this embodiment. In this embodiment, the trough body 10 is a container having at least a bottom wall portion and a side wall portion capable of accommodating cables, and also functions as a drainage gutter buried at the side edge of a road. For ease of explanation, the longitudinal direction of the road and the width direction of the road are defined as the longitudinal direction and the width direction, respectively.

[0022] As shown in FIG. 1, the trough body 10 includes a trough body 11 that functions as a drainage channel and a cable storage space, a trough cover 20 that closes the trough body 11, and a panel 30 on which cables are laid.

[0023] The trough body 11 and the trough lid 20 are preferably made of synthetic resin and are formed by press molding, injection molding, or the like. Here, the trough body 11 and the trough lid 20 may be made of precast concrete, but by making them from synthetic resin, they can easily accommodate a variety of road shape variations, such as a straight shape as shown in FIG. 1, a curved shape as shown in FIG. 2, or a branching shape that is Y-shaped or T-shaped when viewed from above. Furthermore, by making them from synthetic resin, construction is improved by reducing their weight.

[0024] Note that the present disclosure does not exclude the trough body 10 being made of precast concrete. Whether the trough body 10 is made of synthetic resin or precast concrete can be selected appropriately depending on various conditions, such as the surrounding environment and ground conditions of the road on which it is installed, the number and type of cables to be stored, etc.

[0025] The trough body 11 shown in Fig. 1 is formed with a generally U-shaped cross section that is open at the top, and has a bottom wall portion 12 and a pair of first and second side walls 13, 14. The first and second side walls 13, 14 face each other at a predetermined distance in the width direction, and are erected upward from the width direction ends of the bottom wall portion 12. In the following description, the side where the side walls 13, 14 face each other is referred to as the inside, and the opposite side is referred to as the outside.

[0026] First and second step portions 15, 16 are provided at the upper end of each side wall portion 13, 14, respectively, by cutting out the inner upper corner portion of the side wall portion 13, 14. Each step portion 15, 16 is provided at the upper end of the side wall portion 13, 14 over the entire longitudinal length of the trough body 11. The upper opening of the trough body 11 can be closed by fitting and seating the widthwise end portion of the trough lid 20 into each step portion 15, 16.

[0027] A male fitting portion 11A and a female fitting portion 11B are provided at both longitudinal ends of the trough body 11. The male fitting portion 11A is formed in a convex shape that protrudes outward from the trough body 11, and the female fitting portion 11B is formed as a concave groove that opens to the inside of the trough body 11. By fitting the male fitting portion 11A into the female fitting portion 11B of another adjacent trough body, adjacent trough bodies 11 in the longitudinal direction can be connected to each other. Note that the structure for connecting the trough bodies 11 to each other is not limited to the male-female fitting structure shown in the illustration, and other connecting structures can also be applied.

[0028] Here, a connected structure connecting multiple trough bodies 10 in the longitudinal direction is constructed using not only the trough body 10 having the trough lid 20 shown in FIG. 1, but also a trough body 10' without a trough lid as shown in FIG. 3. The trough body 10' shown in FIG. 3 has a rectangular cross section in which the bottom wall 12, side walls 13 and 14, and top wall 17 of the trough body 11' are integrally formed, and the structure other than the top wall 17 is substantially the same as that of the trough body 10. When constructing the connected structure, as shown in FIG. 4, one trough body 10 is placed at a predetermined interval for multiple trough bodies 10' connected continuously in the longitudinal direction. The intervals at which the trough bodies 10 are placed may be set, for example, 15 to 20 meters, within a range that allows for easy routing of cables and cleaning of the interior from the top opening of the trough body 11.

[0029] As shown in FIG. 1, the trough lid 20 is formed in a substantially rectangular plate shape, and a water-permeable anti-slip member 21 is provided on the upper surface thereof.

[0030] 5, anti-slip member 21 is formed by filling recess 22, which is recessed to a predetermined depth from the top surface of trough lid 20, with aggregate, rubber chips, synthetic resin chips, etc. Trough lid 20 is also provided with a plurality of through-holes 23 that penetrate the bottom of recess 22 and the underside of trough lid 20, so that rainwater flowing onto the top surface of trough lid 20 from the road side passes through permeable anti-slip member 21 and through through-holes 23, and falls into the interior of trough body 11.

[0031] In this way, by providing the water-permeable anti-slip member 21 on the upper surface of the trough lid 20, it is possible to reliably collect rainwater and other water within the trough body 11 while effectively ensuring the safety of pedestrians and cyclists walking on the upper surface of the trough lid 20. The through-holes 23 are not essential, and the water-permeable anti-slip member 21 may be provided along the entire length of the trough lid 20, from the upper surface to the lower surface. The configuration of the trough lid 20 is not limited to the permeable structure shown in the illustration, and other structures that allow rainwater to fall downward, such as a lattice-shaped grating, can be applied. The anti-slip member 21 and the through-holes 23 can be provided not only on the trough lid 20 but also on the upper wall portion 17 of the trough body 10′ shown in FIG. 3. The anti-slip member 21 may also be formed by drilling multiple through-holes in a rubber sheet or the like in the vertical direction to allow water to pass through.

[0032] As shown in Figure 5, two drainage channels C1, C2 are defined on the bottom wall 12 side of the trough body 11. Specifically, a protrusion 18 is provided on the bottom wall 12, protruding upward from approximately the middle position in the width direction at a predetermined height. In this embodiment, the height of the protrusion 18 is preferably set to about half the height of the side walls 13, 14. The height of the protrusion 18 may be set to be higher than about half the height of the side walls 13, 14 if a wide drainage channel space is to be secured, or may be set to be lower than about half the height of the side walls 13, 14 if a wide cable storage space is to be secured.

[0033] The protrusion 18 extends longitudinally on the upper surface of the bottom wall 12 and includes a first side plate 18A facing the inner surface of the first side wall 13, a second side plate 18B facing the inner surface of the second side wall 14, and an upper plate 18C connecting the upper ends of the side plates 18A and 18B. The first drainage channel C1 is defined by the inner surface of the first side wall 13, the upper surface of the bottom wall 12, and the inner surface of the first side plate 18A, while the second drainage channel C2 is defined by the inner surface of the second side wall 14, the upper surface of the bottom wall 12, and the inner surface of the second side plate 18B. The number of protrusions 18 is not limited to one; two or more protrusions 18 may be provided to define three or more drainage channels. Alternatively, the protrusion 18 may be omitted to provide a single drainage channel.

[0034] Crushed stone CS is spread around the first side wall portion 13, the bottom wall portion 12, and the second side wall portion 14. In addition, the first side plate portion 18A and the second side plate portion 18B are spaced apart, and crushed stone CS is also spread between them.

[0035] A plurality of drainage holes 19 are provided in the first side wall 13, bottom wall 12, and first side plate 18A at their portions facing the first drainage channel C1, and in the second side wall 14, bottom wall 12, and second side plate 18B at their portions facing the second drainage channel C2. These drainage holes 19 penetrate the bottom wall 12, side walls 13 and 14, and side plate 18A and 18B, respectively. Water collected in the drainage channels C1 and C2 permeates through the drainage holes 19 into the surrounding crushed stone CS, thereby facilitating drainage to the outside. This facilitates drainage to the outside, effectively preventing rainwater from overflowing from the trough body 11 onto the road. Note that the drainage holes 19 may be omitted if drainage is achieved using the slope of the drainage channels C1 and C2.

[0036] The panel 30 is formed, for example, from a synthetic resin or the like into a rectangular plate shape, and is preferably flexible. The panel 30 is preferably formed in a porous or mesh shape that allows water to pass through. The panel 30 is removably attached to the trough body 11 by engaging both ends of the panel 30 with locking mechanisms 40, such as hooks, provided on the first side wall portion 13 and the second side wall portion 14, respectively.

[0037] The locking mechanism 40 is provided on the inner surfaces of the first and second side wall portions 13, 14 at a position below the step portions 15, 16 and above the protrusion portion 18. By locking both ends of the panel 30 to the locking mechanisms 40 and spanning the panel 30 between the side wall portions 13, 14 in the width direction, the internal space of the trough body 11 is divided into a drainage channel space S1 below the panel 30 and a cable storage space S2 above the panel 30.

[0038] The panels 30 may be arranged at predetermined intervals in the longitudinal direction of a connected structure (see FIG. 4) constructed by connecting a plurality of trough bodies 10, 10′, or may be attached so that the plurality of panels 30 are continuous over the entire longitudinal length. When the panels 30 are arranged at predetermined intervals, they may be arranged based on a distance (for example, 1 to 2 m) that can support the cables 50 laid on the upper surface of the panels 30 without causing significant bending.

[0039] The cables 50 are, for example, power transmission cables 51, communication cables 52, optical fiber cables 53, etc., and are stored in the trough body 11 by being laid on the upper surface of the panel 30. When the cables 50 are laid on the upper surface of the panel 30, the lower surface of the panel 30 rests on the upper plate portion 18C of the protrusion 18, thereby enabling the cables 50 to be stably supported. Note that it is preferable to rest the panel 30 on the protrusion 18, but if the number of cables 50 to be laid is small, the panel 30 does not need to be rested.

[0040] Here, when storing a power transmission cable 51, which is a high-power wire (power supply system), and a communication cable 52 and an optical fiber cable 53, which are low-power wires (communication system), together in the trough body 11, it is necessary to block the influence of the magnetic field, etc. of the high-power wire on the low-power wires. In this embodiment, the partition plate 60 divides the cable storage space S2 into a storage space for high-power wires (on the right side in the figure) and a storage space for low-power wires (on the left side in the figure), thereby making it possible to separate these high-power wires and low-power wires.

[0041] The partition plate 60 is a plate made of, for example, synthetic resin or metal, and can be easily attached by fitting it into a stand 61 fixed to the upper surface of the panel 30 or the upper surface of the upper plate portion 18C of the protrusion 18. The stand 61 is provided with a plurality of parallel grooves 62 into which the partition plate 60 is fitted, so that the storage space for high-voltage wires and the storage space for low-voltage wires can be adjusted in stages depending on the number of high-voltage wires and low-voltage wires.

[0042] The partition plate 60 is not an essential component, and may be omitted if only high-voltage or low-voltage cables are to be stored in the trough body 11. In addition, the items to be stored in the trough body 11 are not limited to cables 50, and it is also possible to store piping such as water pipes and gas pipes.

[0043] [Method of burying cables underground] Next, a method for burying cables 50 using the trough bodies 10, 10' according to this embodiment will be described with reference to Figures 6 to 9. In the following, a case where the trough bodies 10, 10' are newly installed at the side edge of a road R (for example, a road shoulder or a roadside strip) will be described as an example.

[0044] In the first step shown in Fig. 6, a trench G larger than the trough body 10 is excavated in the longitudinal direction at the side edge of the road R, and crushed stone CS is laid on the bottom side of the trench G. When replacing an existing trench block with the trough body 10 of this embodiment, the process can begin with removing the existing trench block. When the existing trench block is larger than the trough body 10, the excavation of the trench G can be omitted.

[0045] In the second step shown in Figure 7, the trough body 11 is placed in the trench G and buried in the ground so that the upper end of the trough body 11 is approximately flush with the road surface of the road R. Although not shown in Figure 7, the trough body 11' (see Figure 3) of the trough body 10' without the trough cover 20 is also placed in the trench G and buried while being connected in the longitudinal direction.

[0046] In the third step shown in Figure 8, the panel 30 is attached to the trough body 11, and the cables 50 are passed through the longitudinally connected trough bodies 11, 11', and then laid on the upper surface of the panel 30. At this time, the cables 50 are passed through while being supported by the upper surface of the panel 30, which effectively prevents the cables 50 from getting caught on surrounding structures such as the drainage channels C1, C2. Note that the attachment of the bulkhead plate 60 only needs to be performed when the cables 50 include both high-voltage and low-voltage wires.

[0047] 9, the trough lid 20 is fitted into the upper opening of the trough body 11 to close the upper opening of the trough body 11, thereby completing the undergrounding of the cables 50. The cables 50 that have been buried in this manner are stored above the drainage channel space S1 within the trough body 11. Therefore, for example, when a malfunction such as an electric leak occurs in the cables 50 and replacement or repair is required, maintenance of the cables 50 can be easily performed by simply removing the trough lid 20 without cleaning the drainage channels C1 and C2 below the panel 30.

[0048] 6 to 9, the process from burying the trough bodies 10, 10' as drainage ditches to burying the cables 50 is performed in one step. However, it is also possible that burying the cables 50 will not be necessary for the time being. In such a case, the trough lid 20 is fitted into the upper opening of the trough body 11 in the second step shown in FIG. 7, and the trough bodies 10, 10' function only as drainage ditches until burying the cables 50 becomes necessary. When burying the cables 50 becomes necessary, the trough lid 20 is removed, and burying the cables underground can be started from the step shown in FIG. 8.

[0049] According to the trough body 10 of this embodiment described above, by attaching the panel 30 between the side wall portions 13, 14 of the trough main body 11 and spanning it in the width direction, the internal space of the trough main body 11 is configured to be divided into a drainage channel space S1 below the panel 30 and a cable storage space S2 above the panel 30.

[0050] If such a trough body 10 is buried in the side edge of a road, such as a road shoulder, the trough body 10 can function as a drainage gutter while also being used as a utility cable duct, making it possible to effectively promote the elimination of utility poles even on narrow roads with short sidewalks or no sidewalks.In addition, because the trough body 10 is installed in the longitudinal direction along the side edge of the road, it can also be used to provide various additional functions to the road, such as efficiently transmitting power to an in-motion power supply system.

[0051] In addition, since the trough body 10 can be used as both a drainage ditch and a utility cable duct, on newly constructed roads, the drainage ditch and utility cable duct can be constructed in one operation, thereby reducing construction costs and time. Furthermore, since the trough body 10 is buried at the side edge of the road, such as on the shoulder, construction can be carried out without large-scale road closures.

[0052] Furthermore, since the trough body 10 is buried in the shoulder of the road on the roadway side of the sidewalk, even if it becomes necessary to cut down the adjacent sidewalk after the trough body 10 is installed, the work to cut down the sidewalk can be carried out while leaving the existing trough body 10 in place.

[0053] In addition, since the interior of the trough body 11 is divided into a lower drainage channel space S1 and an upper cable storage space S2, when performing maintenance on the cables 50, the cables 50 can be easily accessed by simply removing the trough lid 20 without having to clean the drainage channels C1 and C2, and when cleaning the drainage channels R1 and R2, the drainage channels C1 and C2 can be easily cleaned by inserting a cleaning tool without moving the cables 50 aside.

[0054] [others] The present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented within the scope of the present disclosure.

[0055] For example, as shown in Fig. 10, the trough body 10 (trough body 10') can be configured as an L-shaped gutter that functions as a pedestrian / vehicle boundary block. Specifically, a curb body 60 that protrudes upward from one of the side wall portions 13, 14 of the trough body 11 (side wall portion 14 in the illustrated example) can be provided. The curb body 60 may be formed integrally with the trough body 11, or may be formed as a separate body that can be attached and detached to the trough body 11. In this way, by configuring the trough body 10 as an L-shaped gutter, construction can be performed integrally with the curb.

[0056] It is preferable to provide multiple types of curbstones 60, one for the sidewalk / vehicle boundary (see FIG. 10(A)), one for the curbstones (see FIG. 10(B)), and one for the access area (see FIG. 10(C)). Providing multiple types of curbstones 60 makes it possible to effectively deal with lowering of the sidewalk.

[0057] In addition, in the above embodiment, the trough bodies 10, 10' have been described as an example of a drainage ditch buried at the side edge of a road, such as a road shoulder, but they can also be widely applied to drainage ditches buried other than the side edge of a road or in places other than the road.

[0058] In the above embodiment, the protrusion 18 is described as being formed integrally with the bottom wall 12 of the trough body 11. However, as shown in FIG. 11 , the protrusion 18 may be provided as a separate structure that is detachable from the trough body 11. In this case, the protrusion 18 may be made of either metal or resin. As shown by the dashed line in FIG. 11 , the protrusion 18 may be provided over the entire longitudinal length of the trough body 11. Alternatively, as shown by the solid line in FIG. 11 , multiple protrusions 18 may be arranged intermittently at predetermined intervals in the longitudinal direction of the trough body 11. By providing the protrusions 18 intermittently, the first drainage channel C1 and the second drainage channel C2 can be merged at the points where the protrusions 18 are intermittent. [Explanation of symbols]

[0059] 10...trough body, 11...trough main body, 12...bottom wall portion, 13...first side wall portion, 14...second side wall portion, 15...first step portion, 16...second step portion, 17...upper wall portion, 18...protrusion portion, 19...drainage hole, 20...trough lid, 21...non-slip member, 30...panel, 40...locking mechanism, 50...cables, 60...partition plate, S1...drainage channel space, S2...cable storage space, C1...first drainage channel, C2...second drainage channel

Claims

1. A trough body having a function as a drainage gutter and a function for storing cables, a trough body having an internal space defined by a bottom wall portion, a pair of side wall portions opposed to each other, and an upper wall portion; a panel member that is stretched between the pair of side wall portions and on whose upper surface the cables are laid, Of the internal space of the trough body, the space below the panel member functions as a drainage channel space, and the space above the panel member functions as a cable storage space, The drainage channel space is divided into a first drainage channel and a second drainage channel. The protrusion supports the lower surface of the panel member on which the cables are laid. A trough body characterized by:

2. Drainage holes are formed through the bottom wall and / or the pair of side wall portions to discharge water in the drainage channel space to the outside of the trough body. The trough body according to claim 1 .

3. The upper wall portion is formed separately from the trough body and is a lid member that can be fitted between the upper ends of the pair of side wall portions. The trough body according to claim 1 or 2.

4. The lid member is provided with a water-permeable anti-slip member that allows water to pass from the top surface to the bottom surface of the lid member. The trough body according to claim 3 .

5. A trough body having a function as a drainage gutter and a function for storing cables, a trough body having an internal space defined by a bottom wall portion, a pair of side wall portions opposed to each other, and an upper wall portion; a panel member that is stretched between the pair of side wall portions and on whose upper surface the cables are laid, Of the internal space of the trough body, the space below the panel member functions as a drainage channel space, and the space above the panel member functions as a cable storage space, the upper wall portion is formed separately from the trough body and is a cover member that can be fitted between upper ends of the pair of side wall portions, The cover member is provided with a water-permeable anti-slip member that allows water to pass from the upper surface to the lower surface of the cover member. A trough body characterized by:

6. A drainage hole is formed through the bottom wall portion and / or the pair of side wall portions to discharge water in the drainage channel space to the outside of the trough body. The trough body according to claim 5 .

7. The panel member is formed in a porous or mesh shape that is permeable to water. The trough body according to any one of claims 1 to 6.

8. The panel member further includes a locking mechanism for locking the end of the panel member to the inner surface of the side wall portion. A trough body according to any one of claims 1 to 7.

9. The cable storage space further includes a partition plate attached to the upper surface of the panel member and dividing the cable storage space into a first storage space for high-voltage cables and a second storage space for low-voltage cables. A trough body according to any one of claims 1 to 8.

10. The trough body is made of synthetic resin. A trough body according to any one of claims 1 to 9.

11. A method for laying cables underground using the trough body according to any one of claims 1 to 10, A step of placing and burying the trough body in a trench excavated at the side edge of a road; attaching the panel member to the interior of the trough body; and a step of passing the cables through a space above the panel member in the trough body and laying them on the upper surface of the panel member. A method for burying cables underground, characterized by the above.

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