Deck structure and deck construction method

Abstract

To effectively suppress a decrease in power transmission efficiency while ensuring strength as a paved surface for the installation of a contactless power supply system on a road.SOLUTION: A pavement structure for installing on a road R a contactless power supply system 100 having a power transmission coil 110 for contactlessly supplying power to a mobile object 200 being traveling or stopped, comprises: a case 10, embedded in a pavement layer of the road R and formed in a container shape that opens upward, for housing the power transmission coil 110; and a lid member 20 for closing the upper opening of the case 10 and whose upper surface forms a part of the pavement surface of the road R. The lid member 20 comprises a fiber reinforced resin or a fiber reinforced cement composite.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a pavement structure and a pavement method, and more particularly to a technology suitable for installing a non-contact power supply system for non-contact power supply to a moving body (including when stopped) on a road.

Background Art

[0002] In recent years, electric vehicles, hybrid vehicles, and hydrogen fuel cell vehicles (hereinafter referred to as electric vehicles) that supply power charged in a storage battery to an electric motor and run using the driving force of the electric motor have become widely popular. Generally, power supply to such electric vehicles is performed by parking the electric vehicle at a charging stand and connecting the electric vehicle and the charging stand with a cable.

[0003] However, wired parking charging performed by parking an electric vehicle has problems such that the electric vehicle cannot be driven during the charging period, and further, it takes time to charge. For this reason, in recent years, various technologies for non-contact power supply to a moving electric vehicle using electromagnetic induction or magnetic resonance have been proposed.

[0004] For example, Patent Document 1 discloses a non-contact power supply system in which a power transmission coil and reinforcing steel bars arranged in a grid pattern are integrated using concrete to form a laying unit, and the laying unit is manufactured in a factory in advance so as to omit the concrete placing work at the site.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in the structure described in Patent Document 1, the reinforcing bars are embedded only in the concrete below the power transmission coil and are not provided in the concrete above the power transmission coil. For this reason, there is a problem that the strength of the upper concrete directly receiving the load from a vehicle or the like is insufficient, resulting in a problem with durability. Further, in the structure described in Patent Document 1, since the power transmission coil is formed as a unit integrated by being embedded in the concrete, there is also a problem that maintainability is impaired.

[0007] On the other hand, in order to ensure the strength of the concrete above the power transmission coil, if reinforcing bars are embedded in the upper concrete portion, the upper concrete portion becomes thick and deep due to the cover thickness, and the loss due to the coil-to-coil distance between the power transmission coil and the power reception coil increases. Further, since the reinforcing bars are interposed between the power transmission coil and the power reception coil on the electric vehicle side, not only does the power transmission efficiency decrease due to the reinforcing bars, but also eddy currents are generated in the reinforcing bars by the magnetic field generated from the power transmission coil, causing the reinforcing bars themselves to heat up and also reducing the power transmission efficiency.

[0008] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a paving structure and a paving method that can effectively improve power transmission efficiency while ensuring the strength as a paving surface with respect to the installation of a non-contact power supply system on a road.

Means for Solving the Problems

[0009] The paving structure of the present disclosure is a paving structure for installing a non-contact power supply system including a power transmission coil for non-contact power supply to a moving body capable of traveling on a road during traveling or stopping of the moving body on the road, a case formed in a container shape that opens upward and houses the power transmission coil and is embedded in the paving layer of the road, and a lid member that closes the upper opening of the case and whose upper surface forms a part of the paving surface of the road. It is characterized in that the lid member is formed of a fiber-reinforced resin or a fiber-reinforced cement composite material.

[0010] Another aspect of the paving structure of the present disclosure is It is preferable to further include a holding member that holds the power transmission coil adjacent to or close to the lower surface of the lid member.

[0011] Another aspect of the paving structure of the present disclosure is It is preferable to further include a support member that is formed in a columnar shape extending upward from the bottom of the case and supports the lower surface of the lid member.

[0012] Another aspect of the paving structure of the present disclosure is It is preferable that the lid member is formed to extend outward from the case.

[0013] Another aspect of the paving structure of the present disclosure is It further includes a flange portion protruding outward from the upper end of the case, It is preferable that the case and the lid member are fixed by being clamped together with bolts inserted from the lower surface side of the flange portion and not exposed on the upper surface of the lid member.

[0014] Another aspect of the paving structure of the present disclosure is It is preferable that a fire spread prevention material is provided in the case.

[0015] Another aspect of the paving structure of the present disclosure is It is preferable that an inclined surface that inclines downward from the center side to the periphery is provided on the upper surface of the lid member.

[0016] In another aspect of the paving structure of the present disclosure, It is preferable that a plurality of concave grooves extending along the inclined direction are provided on the inclined surface. Also, in another aspect of the paving structure of the present disclosure, A plurality of concave grooves are provided on the upper surface of the lid member, and it is preferable that the groove bottom surface of the concave groove is formed to incline downward from the center side of the lid member toward the periphery.

[0017] The paving method of the present disclosure is A paving method for installing the power transmission coil on the road using a paving structure including the lid member provided with the inclined surface, A step of embedding the case in the paving layer of the road, A step of installing, on the upper part of the case, a temporary lid member having a flat upper surface that is flush with the paving surface of the road, A step of rolling the paving layer of the road with a roller, A step of removing the temporary lid member after rolling by the roller, A step of installing the lid member on the upper part of the case from which the temporary lid member has been removed, characterized by comprising.

Effect of the Invention

[0018] According to the paving structure and paving method of the present disclosure, regarding the installation of the non-contact power supply system on the road, while ensuring the strength as a paving surface, the power transmission efficiency can be effectively improved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0020] Hereinafter, based on the accompanying drawings, a paving structure and a paving method according to this embodiment will be described. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0021] [Non-contact Power Supply System] FIG. 1 is a schematic overall configuration diagram showing a non-contact power supply system 100 installed on a road using the paving structure and the paving method according to this embodiment. In FIG. 1, reference numeral 200 schematically shows an example of an electric vehicle that receives power from the non-contact power supply system 100.

[0022] First, an overview of the electric vehicle 200 will be described. A power receiving coil 210 is provided at the bottom of the vehicle body of the electric vehicle 200. When an alternating current is passed through the power transmission coil 110 of the non-contact power supply system 100 described later, a magnetic field is generated, and when the power receiving coil 210 receives the magnetic field, an alternating current flows through the power receiving coil 200.

[0023] The rectifier 220 converts the alternating current from the power receiving coil 210 into a direct current. The direct current converted by the rectifier 220 is supplied to the storage battery 230 for storage, or supplied to electrical components (not shown) and the like. The inverter 240 converts the direct current supplied from the storage battery 230 into an alternating current and supplies it to the motor generator 250. The inverter 240 adjusts the driving force by appropriately adjusting the voltage supplied to the motor generator 250 according to a command from a control device (ECU) (not shown) mounted on the electric vehicle 200.

[0024] The non-contact power supply system 100 is installed on the road R on which the electric vehicle 200 travels. The non-contact power supply system 100 includes a plurality of power transmission coils 110, a plurality of power transmission circuits 120 that supply an alternating current to each of the power transmission coils 110, and a power supply device 130 for supplying a direct current to each of the power transmission circuits 120.

[0025] The plurality of power transmission coils 110 are arranged at predetermined intervals along the longitudinal direction of the road R. The power transmission circuit 120 converts the direct current supplied from the power supply device 130 into an alternating current and supplies it to the power transmission coil 110. The power supply device 130 is a circuit that supplies a direct current to the power transmission circuit 120, and is configured to include an AC / DC converter or the like that rectifies an alternating current and outputs a direct voltage.

[0026] As described above, the non-contact power supply system 100 generates an alternating current in the power receiving coil 210 by means of a magnetic field generated from the power transmission coil 110. For this reason, in order to improve the power transmission efficiency, it is desirable to make these distances as short as possible. To shorten the distance between the power transmission coil 110 and the power receiving coil 210, it is conceivable to project the power transmission coil 110 from the road surface. However, since this may become an obstacle during vehicle travel, the power transmission coil 110 needs to be installed below the paving surface of the road R (for example, the paving layer). However, if the power transmission coil 110 is directly embedded in the paving layer without being housed in a case or the like, there is a problem that the maintainability after installation deteriorates.

[0027] For this reason, it is conceivable to house the power transmission coil 110 in a case or the like, close the case with a lid member or the like, and embed these case and lid member in the paving layer. In this case, since the lid member forms a part of the paving surface, it is necessary to have a strength that can withstand a load or the like. If the lid member is made of reinforced concrete in order to ensure the strength of the lid member, there is a problem that not only does the steel bar cause a decrease in power transmission efficiency, but also the steel bar itself generates heat due to the magnetic field, resulting in a decrease in power transmission efficiency. Further, in order to prevent the steel bar from corroding due to the influence of cracking caused by the neutralization of the concrete, it is necessary to ensure a certain cover thickness by the concrete, and there is also a problem that the distance between the coils 110 and 210 becomes long.

[0028] The paving structure and the paving method of the present embodiment are devised in the structure, shape, and material of the lid member and the case so as to comprehensively solve these problems. Hereinafter, the details of the paving structure of the present embodiment will be described.

[0029] [First Embodiment] FIG. 2 is a schematic longitudinal sectional view showing a paving structure according to the first embodiment. As shown in FIG. 2, the paving structure of the first embodiment includes a case 10 that houses the power transmission coil 110 and a lid member 20 that closes the case 10.

[0030] The case 10 includes a bottom wall portion 11 and a side wall portion 12, and has a container shape that is open upward. The size of the case 10 only needs to be large enough to accommodate at least one power transmission coil 110, and may also be large enough to accommodate both the power transmission coil 110 and the power transmission circuit 120 (see FIG. 1). The material forming the case 10 is not particularly limited, and for example, it can be formed of a resin material or the like.

[0031] The case 10 is buried in a paving layer (for example, an asphalt layer) of the road R such that its upper end is offset downward from the paving surface of the road R by the thickness of the lid member 20. That is, when the upper opening of the case 10 buried in the paving layer is closed by the lid member 20, the upper surface of the lid member 20 is configured to be a part of the paving surface of the road R. For this reason, the dimensions of the case 10 and the lid member 20 in the road width direction are preferably formed to be shorter than the distance between the left and right wheels of the vehicle (for example, about 1 m) so that the lid member 20 forming the paving surface does not interfere with the left and right wheels of the vehicle. Further, since the case 10 is buried in a portion corresponding to the foundation in the road cross-sectional structure, it is preferably formed while ensuring a predetermined depth.

[0032] The lid member 20 is formed in a substantially rectangular shape in plan view and closes the upper opening of the case 10. The fixing method of the lid member 20 and the case 10 is not particularly limited, and for example, they can be fixed with bolts. When using bolts, through holes penetrating in the vertical direction are formed at a plurality of locations of the lid member 20, and female screw holes are formed at the upper end portion of the case 10, and the bolts may be inserted into the through holes and screwed with the female screw holes for fixing. A resin seal packing (not shown) for ensuring the water tightness of these gaps may be interposed between the lid member 20 and the case 10.

[0033] In this embodiment, the power transmission coil 110 is disposed adjacent to or in the vicinity of the lower surface of the lid member 20. As a structure for disposing the power transmission coil 110 adjacent to or in the vicinity of the lower surface of the lid member 20, as shown in FIG. 2, a holding member 30 extending downward from the lower surface of the lid member 20 may be provided, and the power transmission coil 110 may be attached to the holding member 30. Alternatively, as shown in FIG. 3, a holding member 31 extending upward from the bottom wall portion 11 of the case 10 may be provided, and the power transmission coil 110 may be supported on the upper surface of the holding member 31. Alternatively, as shown in FIG. 4, a holding member 32 protruding inward from the side wall portion 12 of the case 10 may be provided, and the power transmission coil 110 may be supported on the upper surface of the holding member 32. In any of these cases, it is preferable that the power transmission coil 110 is brought into contact with the lower surface of the lid member 20 or supported with a minute clearance from the lower surface of the lid member 20.

[0034] Thus, by disposing the power transmission coil 110 adjacent to or in the vicinity of the lower surface of the lid member 20, the distance between the power transmission coil 110 and the power reception coil 210 can be significantly shortened as compared with the case where the power transmission coil 110 is placed on the bottom wall portion 11 of the case 10. As the power transmission coil 110 approaches the power reception coil 210, it becomes possible to surely improve the power transmission efficiency.

[0035] Here, since the lid member 20 forms a part of the paving layer of the road R, it is necessary to ensure a strength that can withstand the load during vehicle travel and the like. On the other hand, if the lid member 20 is made of reinforced concrete, it is not preferable because it causes a decrease in power transmission efficiency due to the reinforcing bars and heat generation of the reinforcing bars due to the magnetic field. Further, as described above, in order to prevent corrosion of the reinforcing bars, a certain cover thickness by the concrete must be ensured. From such a viewpoint, the lid member 20 of this embodiment can ensure strength without using reinforcing bars or the like, and is formed of a fiber-reinforced resin that does not require a cover thickness such as that of reinforced concrete. As the fiber-reinforced resin, a glass fiber-reinforced resin is preferable, and examples of the resin to be compounded include a thermoplastic polypropylene resin and a thermosetting vinyl ester resin.

[0036] Thus, by forming the lid member 20 from a fiber-reinforced resin, it becomes possible to ensure the strength (load resistance) required for the paving layer. Further, by using a fiber-reinforced resin for the lid member 20, it becomes possible to form the lid member 20 thinly, and it also becomes possible to effectively shorten the distance between the power transmission coil 110 disposed adjacent to the lower surface of the lid member 20 and the power reception coil 210 on the vehicle side. In addition, since the lid member 20 formed of a fiber-reinforced resin does not include reinforcing bars or the like, the power transmission coil 110 can be effectively installed on the road R without accompanying a decrease in power transmission efficiency due to the reinforcing bars or heat generation of the reinforcing bars due to the magnetic field.

[0037] [Second Embodiment] FIG. 5 is a schematic longitudinal sectional view showing a paving structure according to the second embodiment. The paving structure of the second embodiment improves the water drainage property of the upper surface of the lid member 20 by devising the shape of the lid member 20 of the first embodiment. Since the holding structure of the power transmission coil 110 housed in the case 10 can adopt the same structure as the holding structure (see FIGS. 2 to 4) of the first embodiment, the description thereof will be omitted below.

[0038] As shown in FIG. 5, the lid member 20 of the second embodiment is formed in a triangular shape that is convex upward in a longitudinal sectional view, and has an inclined surface 21 that inclines from the central portion C in the width direction toward the peripheral portion E. The height of the central portion C (the gradient of the inclined surface 21) is not particularly limited, but it is desirable to set it within a range that does not affect the running of the vehicle even when the vehicle straddles the lid member 20 during a lane change.

[0039] As a shape having the inclined surface 21, for example, as shown in FIG. 6, the upper surface of the lid member 20 may be formed in a quadrangular pyramid shape composed of four inclined surfaces 21, or as shown in FIG. 7, a triangular strip having a pair of inclined surfaces 21 that incline toward the peripheral portion E with a ridge line L extending through the central portion as a boundary.

[0040] Each inclined surface 21 is provided with a plurality of concave grooves 22 extending in parallel to each other along the inclined direction. These plurality of concave grooves 22 function as drain grooves that actively flow rainwater and the like from the central part C side toward the peripheral part E along the inclined surface 21.

[0041] In this way, by providing the inclined surface 21 on the upper surface of the lid member 20 forming the paved surface of the road R and providing the concave groove 22 as a drain groove on the inclined surface 21, it becomes possible to effectively prevent rainwater and the like from accumulating on the upper surface of the lid member 21. By preventing the retention of rainwater, it is possible to surely suppress a decrease in power transmission efficiency from the power transmission coil 110 to the power reception coil 210 even in rainy weather. In addition, by providing the concave groove 22 on the inclined surface 21, it is possible to effectively prevent slipping when the vehicle straddles the lid member 20. Note that the upper surface shape of the lid member 20 is not limited to the shape shown in FIGS. 6 and 7, and any other shape may be used as long as it has an inclined surface 21 capable of flowing rainwater toward the peripheral part E.

[0042] [Third Embodiment] FIG. 8 is a schematic longitudinal sectional view showing a paving structure according to the third embodiment. The paving structure of the third embodiment expands the lid member 20 in the width direction compared to the first embodiment, and fixes the lid member 20 and the case 10 from the back side by bolts B so that the bolts B are not exposed on the paved surface. Hereinafter, the details of the third embodiment will be described.

[0043] As shown in FIG. 8, the paving structure of the third embodiment includes a case 10, a lid member 20, and a backrest member 40. Since the holding structure of the power transmission coil 110 housed in the case 10 can apply the same structure as the holding structure (see FIGS. 2 to 4) of the first embodiment, the description thereof will be omitted below.

[0044] The case 10 includes a case body 13 in a container shape having a bottom wall portion 11 and a side wall portion 12. Further, the case body 13 is provided with a rectangular frame-shaped flange portion 14 protruding outward from the upper end of the side wall portion 12. A plurality of bolt insertion holes 15 for inserting bolts B are formed in the flange portion 14. The material of the case 10 is not particularly limited, but can be formed of a resin material or the like as in the first embodiment.

[0045] A lid member 20 is seated on the upper surface of the flange portion 14. The lid member 20 is provided with female screw holes 20A (or embedded nuts) at positions corresponding to the bolt insertion holes 15 of the flange portion 14. The lid member 20 is formed using a fiber-reinforced resin, preferably a glass fiber-reinforced resin, that can ensure strength as a paving layer, similar to the first embodiment.

[0046] In the third embodiment, the lid member 20 is formed to be larger than the flange portion 14 and extend outward. That is, when the lid member 20 is seated and fixed on the flange portion 14, the outer peripheral side portion of the lower surface of the lid member 20 protrudes outward from the flange portion 14. The protruding amount X of the lower surface of the lid member 20 is not particularly limited, but it is desirable that it be at least twice the width W of the flange portion 14. The upper surface of the backing member 40 is pressed against the lower surface of the lid member 20 that protrudes outward from the flange portion 14.

[0047] The backing member 40 forms a rectangular annular shape that can be fitted into the case body 13. The outer peripheral dimensions of the backing member 40 are formed to be substantially equal to the outer peripheral dimensions of the lid member 20. A tapered surface 41 that inclines inward from the upper end to the lower end is provided on the outer peripheral surface of the backing member 40. The inner periphery 42 of the backing member 40 is formed in a stepped hole shape that contacts the outer peripheral surface of the case body 13 and the outer peripheral surface of the flange portion 14, respectively. The height dimension (thickness) of the backing member 40 is not particularly limited, but it is formed to be thicker than the flange portion 14 and lower than the case body 13. The material of the backing member 40 is also not particularly limited, but can be formed of, for example, a fiber-reinforced resin.

[0048] The back lining member 40 is provided with bolt insertion holes 43 at positions corresponding to the bolt insertion holes 15 of the flange portion 14. By inserting the bolt B into the bolt insertion holes 43 from the back side and tightening the back lining member 40 together with the flange portion 14 and the lid member 20, the case 10, the lid member 20, and the back lining member 40 can be integrated as a unit.

[0049] When the back lining member 40 is integrated with the case 10 and the lid member 20, the upper surface of the back lining member 40 comes into pressure contact with the lower surface that protrudes outward from the flange portion 14 of the lid member 20. In this way, by bringing the lower surface of the lid member 20 and the upper surface of the back lining member 40 into surface contact in a substantially rectangular shape in a wider area outside the case 10, it is possible to ensure a longer water intrusion path compared to a structure where the lid member 20 is in contact only with the flange portion 14. Also, since the bolt B is inserted and fixed from the back side of the back lining member 40, the bolt B is not exposed on the paving surface. For example, even if a waterproof seal packing or the like is torn, it is possible to effectively prevent water from entering the case 10.

[0050] In the third embodiment shown in FIG. 8, the upper surface of the lid member 20 is formed flat, but as shown in FIG. 9, similar to the second embodiment, the lid member 20 can also be formed in a triangular shape that is convex upward in a longitudinal sectional view. Also in this case, although not shown, it is desirable to provide a concave groove 22 similar to that of the second embodiment on the inclined surface 21.

[0051] [Fourth Embodiment] FIGS. 10(A) to 10(C) are schematic longitudinal sectional views showing a paving structure according to the fourth embodiment. In the fourth embodiment, at least the lid member 20 is formed of a plurality of micro-cracked fiber-reinforced cement composite materials (hereinafter simply referred to as HPFRCC). This HPFRCC has improved strength by randomly blending short fibers in a cement matrix. Since the holding structure of the power transmission coil 110 housed in the case 10 can adopt the same structure as the holding structure of the first embodiment (see FIGS. 2 to 4), the description will be omitted hereinafter.

[0052] FIG. 10(A) shows a case where the case 10 is formed of a resin material and the lid member 20 is formed of HPFRCC. These resin cases 10 and HPFRCC lid members 20 may be pre-manufactured in a factory and transported to the site for assembly, or the lid member 20 may be constructed by in-situ casting. In the case of in-situ casting, a formwork 27 for the lid is installed on the upper part of the case 10, and the lid member 20 may be formed by casting HPFRCC into the formwork 27. The formwork 27 may be left in place or removed. In the case of leaving it in place, the formwork 27 may be formed of a non-conductive material. Preferably, the lid member 20 is provided with a hooking fitting (not shown) for hooking tools or the like when opening the lid member 20 during maintenance.

[0053] FIG. 10(B) shows a case where the case 10 is formed of a resin material, the lid member 20 is formed of HPFRCC, and the lid member 20 is formed to be larger than the case 10 and extends outward. These resin cases 10 and HPFRCC lid members 20 may be pre-manufactured in a factory and transported to the site for assembly, or the lid member 20 may be constructed by in-situ casting. In the case of in-situ casting, a formwork 27 for the lid that is larger than the case 10 is installed on the upper part of the case 10, and the lid member 20 may be formed by casting HPFRCC into the formwork 27. The formwork 27 may be left in place or removed. In the case of leaving it in place, the formwork 27 may be formed of a non-conductive material. Thus, if the lid member 20 is formed to be extended, similar to the third embodiment, a long water intrusion path can be ensured, and water intrusion into the case 10 can be effectively prevented.

[0054] FIG. 10(C) shows a case where both the case 10 and the lid member 20 are formed of HPFRCC. These HPFRCC-made case 10 and lid member 20 may be carried into the site after being pre-manufactured in a factory, or both of them may be constructed by in-situ casting. In the case of in-situ casting, the power transmission coil 110 is housed in a resin-made simple case 10A, and a formwork 27 for the lid and a formwork 28 for the case are installed, and the case 10 and the lid member 20 may be formed by placing HPFRCC in these formworks 27, 28. These formworks 27, 28 may be left in place or removed. In the case of leaving them in place, the formworks 27, 28 may be formed of a non-conductive material.

[0055] According to the pavement structure of the fourth embodiment described in detail above, by forming at least the lid member 20 of HPFRCC among the case 10 and the lid member 20, the strength of the lid member 20 as a pavement layer can be surely ensured without using reinforcing bars or the like. Thereby, it becomes possible to effectively install the power transmission coil 110 on the road R without accompanying a decrease in power transmission efficiency due to reinforcing bars or heat generation of the reinforcing bars due to a magnetic field.

[0056] Although detailed illustration is omitted, also in the fourth embodiment shown in FIGS. 10(A) to (C), by devising the shape of the formwork 27, similar to the second embodiment, the lid member 20 can be formed in a triangular shape that protrudes upward in a longitudinal sectional view, and drain grooves can also be provided in each inclined surface.

[0057] [Fifth Embodiment] FIG. 11 is a schematic longitudinal sectional view showing a pavement structure according to the fifth embodiment. The pavement structure of the fifth embodiment is such that the lid member 20 is formed of a glass fiber reinforced resin, and a support member 50 for supporting the lid member 20 from below is provided in the case 10.

[0058] The lid member 20 of the fifth embodiment is formed of a glass fiber reinforced resin. Examples of the resin to be compounded include a thermoplastic polypropylene resin and a thermosetting vinyl ester resin. By forming the lid member 20 with a high-strength glass fiber reinforced resin in this way, it is possible to reduce the wall thickness while ensuring the load resistance of the lid member 20, and it becomes possible to improve the power transmission efficiency.

[0059] In the present embodiment, in the case 10, a columnar support member 50 is provided which stands upright upward from the bottom wall portion 11 and supports the lower surface of the lid member 20. The support member 50 passes through substantially the center of the power transmission coil 110 and supports the lower surface near the center portion of the lid member 20 which is most likely to bend.

[0060] The material of the support member 50 is not particularly limited, but it is preferably formed of a non-magnetic resin material so as not to affect the magnetic field of the power transmission coil 110. As the non-magnetic resin material, for example, a glass fiber reinforced resin can be used. The support member 50 may be fixed to the bottom wall portion 11 by bolt fixing, or may be fixed with an adhesive or the like. The upper end of the support member 50 does not need to be fixed to the lower surface of the lid member 20, and it is sufficient that it abuts against the lower surface of the lid member 20.

[0061] By supporting the lower surface of the lid member 20 with the support member 50 in this way, compared with a structure that does not support the lid member 20, the wall thickness of the lid member 20 can be made as thin as possible, and it becomes possible to more surely improve the power transmission efficiency.

[0062] Inside the case 10, a fire retardant material 60 is installed so as to surround the power transmission coil 110. The fire retardant material 60 is formed including, for example, non-conductive calcium carbonate or the like. By providing the fire retardant material 60 inside the case 10 in this way, even if a foreign object such as metal that has entered the case 10 generates heat in a magnetic field, it is possible to effectively prevent the lid member 20 and the case 10 from melting due to combustion. Further, in the fifth embodiment in which the power transmission coil 110 is housed in the case 10 so as to be surrounded by the fire retardant material 60, the power transmission coil 110 can be held adjacent to or close to the lid member 20 by the fire retardant material 60. Therefore, the holding structure of the power transmission coil 110 (see FIGS. 2 to 4) as exemplified in the first embodiment can be omitted, and the holding structure can be simplified.

[0063] [Paving method] Next, based on FIGS. 12 and 13, the paving method according to the present embodiment will be described. The paving method of the present embodiment can be applied to the installation construction of a paving structure (see FIGS. 5 and 9) in which the lid member 20 has a triangular shape convex upward.

[0064] In step S100, the case 10 is buried in the paving layer of the road R, and in step S110, the upper opening of the case 10 is closed with a temporary lid member 300 (see FIG. 12(A)). Here, the temporary lid member 300 has a rectangular plate shape, and its upper surface is formed flat. When the temporary lid member 300 is installed, the upper surface of the temporary lid member 300 becomes the same height as the paving surface of the road R. The temporary lid 300 only needs to have a strength that can withstand rolling by a roller, and can be made of either resin or steel.

[0065] If the temporary lid member 300 is installed, in step S120, rolling construction of the paving surface is performed using a roller such as a road roller. At this time, since the upper surface of the temporary lid member 300 is at the same height as the paving surface of the road R, it is possible to apply a uniform rolling pressure to the paving surface of the road R and the upper surface of the temporary lid member 300.

[0066] If the rolling compaction construction is completed, in step S130, the temporary cover 300 is removed from the case 10 (see Fig. 12(B)). Here, it is desirable to devise the temporary cover member 300 to improve the mold release property from asphalt. Examples of the device for improving the mold release property include providing a diagonal notch at the corner of the temporary cover member 300, or performing a process for reducing the adhesion to asphalt on the end face of the temporary cover member 300. The removed temporary cover member 300 can be reused for the next construction until it is damaged or the like.

[0067] If the temporary cover member 300 is removed, in step S140, the regular cover member 20 is fitted to close the upper opening of the case 10, thereby completing the installation construction of the power transmission coil 110 (see Fig. 12(C)).

[0068] In this way, by installing the flat temporary cover 300 and performing the rolling compaction construction before installing the regular triangular cover member 20, the rolling pressure by the roller can be evenly applied to the road R. By achieving the uniformization of the rolling pressure, it becomes possible to improve the paving quality of the road R.

[0069] Note that the timing of accommodating the power transmission coil 110 in the case 10 may be either before installing the temporary cover member 300 in step S110 or immediately before fitting the regular cover member 20 in step S140. Also, if the installation of the power transmission coil 110 is not required for the time being, after once completing the steps up to step S140, when the installation of the power transmission coil 110 becomes unnecessary, it may be accommodated by removing the regular cover member 20.

[0070] [Others] Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

[0071] For example, the support member 50 and the fire spread prevention material 60 of the fifth embodiment can also be respectively applied to the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment. Further, in the above embodiments, an example in which the power transmission coil 110 of the non-contact power supply system 100 transmits power to the power reception coil 210 arranged at the bottom of the vehicle body of the electric vehicle 200 has been described, but it can also be applied to a power supply system that performs power transmission via a tire or the like of the electric vehicle 200. In this case, the case 10 and the lid member 20 may be respectively installed on both sides of the road R through which the tires of the electric vehicle 200 pass.

[0072] Also, in the first embodiment, the second embodiment, the third embodiment, and the fifth embodiment, at least the lid member 20 may be formed of HPFRCC, and in the fourth embodiment, at least the lid member 20 may be formed of a fiber-reinforced resin material.

[0073] Further, as shown in FIG. 14, a plurality of concave grooves 22 may be provided in parallel in the road width direction or the road longitudinal direction with respect to the lid member 20 having a flat upper surface, and the groove bottom surface of each concave groove 22 may be formed to incline downward from the center side to the periphery of the lid member 20. Also in this case, rainwater or the like on the upper surface of the lid member 20 flows along the inclination of the groove bottom surface of the concave groove 22, so that it is possible to effectively ensure the water drainage property. Further, in the case of the configuration shown in FIG. 14, since the upper surface is flat, there is an advantage that even when the wheel passes over the upper surface, the influence on the tire (for example, the influence on the running behavior of the vehicle) can be reduced.

Explanation of Reference Numerals

[0074] 10... Case, 11... Bottom wall portion, 12... Side wall portion, 13... Case body, 14... Flange portion, 20... Lid member, 21... Inclined surface, 22... Concave groove, 30, 31, 32... Holding member, 40... Backing member, 50... Support member, 60... Fire spread prevention material, 100... Non-contact power supply system, 110... Power transmission coil, 200... Electric vehicle, 210... Power reception coil, 300... Temporary lid member, B... Bolt

Claims

1. A paving structure for installing a non-contact power supply system having a power transmission coil for non-contact power supply to a moving body capable of traveling on a road, during or while the moving body is stopped, comprising: a case formed in a container shape that opens upward and houses the power transmission coil, and is embedded in the paving layer of the road; a lid member that closes the upper opening of the case and whose upper surface forms part of the paving surface of the road; the lid member is formed of a fiber-reinforced resin or a fiber-reinforced cement composite material; the lid member is formed to extend outward from the case; further comprising a flange portion protruding outward from the upper end of the case; the case and the lid member are fixed by being clamped together by bolts inserted from the lower surface side of the flange portion and not exposed on the upper surface of the lid member characterized by the paving structure.

2. further comprising a holding member that holds the power transmission coil adjacent to or close to the lower surface of the lid member The paving structure according to claim 1.

3. further comprising a support member formed in a columnar shape extending upward from the bottom of the case and supporting the lower surface of the lid member The paving structure according to claim 1 or 2.

4. a fire spread prevention material is provided in the case The paving structure according to any one of claims 1 to 3.

5. an inclined surface that slopes downward from the center side to the periphery of the lid member is provided on the upper surface of the lid member The paving structure according to any one of claims 1 to 4.

6. a plurality of concave grooves extending along the inclined direction are provided on the inclined surface The paving structure according to claim 5.

7. a plurality of concave grooves are provided on the upper surface of the lid member, and the groove bottom surface of the concave grooves is formed to slope downward from the center side to the periphery of the lid member The paving structure according to any one of claims 1 to 4.

8. A paving structure for installing a non-contact power supply system having a power transmission coil for non-contact power supply to a moving body capable of traveling on a road, during or while the moving body is stopped, comprising: a case formed in a container shape that opens upward and houses the power transmission coil, and is embedded in the paving layer of the road; a lid member that closes the upper opening of the case and whose upper surface forms part of the paving surface of the road; the lid member is formed of a fiber-reinforced resin or a fiber-reinforced cement composite material; A paving method for installing the power transmission coil on the road using either a paving structure in which an inclined surface that slopes downward from the center side to the periphery of the lid member is provided on the upper surface of the lid member, or a paving structure in which a plurality of concave grooves extending along the inclined direction are further provided on the inclined surface, a step of embedding the case in the paving layer of the road, a step of installing a temporary lid member having a flat upper surface that is flush with the paving surface of the road on the upper part of the case, a step of compacting the paving layer of the road with a compactor, a step of removing the temporary lid member after compaction by the compactor, and a step of installing the lid member on the upper part of the case from which the temporary lid member has been removed. A paving method characterized by the above.

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