JP2023023997A - Pavement structure and paving method - Google Patents

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 The present disclosure relates to a pavement structure and a paving method, and relates to a technology suitable for installing a contactless power supply system on a road for contactlessly supplying power to a moving body that is running (including a stopped one). .

2. Description of the Related Art In recent years, electric vehicles, hybrid vehicles, and hydrogen fuel cell vehicles (hereinafter referred to as "electric vehicles") that run using the driving force of an electric motor supplied with electric power charged in a storage battery have become widespread. Generally, power is supplied to such an electric vehicle by parking the electric vehicle at a charging stand and connecting the electric vehicle and the charging stand with a cable.

However, the wired parking charging performed by parking the electric vehicle has the problem that the electric vehicle cannot be driven during the charging period, and furthermore, the charging takes time. For this reason, in recent years, various techniques have been proposed for contactlessly supplying power to a running electric vehicle using electromagnetic induction or magnetic resonance.

For example, Patent Literature 1 discloses that a power transmission coil and reinforcing bars arranged in a lattice form an integral laying unit using concrete, and by manufacturing the laying unit in advance at a factory, concrete on site A non-contact power feeding system is disclosed in which it is possible to omit the installation work.

JP 2020-150754 A

By the way, in the structure described in Patent Document 1, the reinforcing steel bar is embedded only in the concrete below the power transmission coil, and is not provided in the concrete above the power transmission coil. For this reason, there is a problem that the strength of the upper concrete, which directly receives a load from a vehicle or the like, is insufficient, resulting in a problem of durability. Moreover, in the structure described in Patent Document 1, since the power transmission coil is embedded in concrete and formed as an integrated unit, there is also a problem of maintainability.

On the other hand, if a reinforcing steel bar is buried in the upper concrete part to ensure the strength of the concrete above the power transmission coil, the upper concrete part becomes thicker and deeper due to the thickness of the cover, and the coil between the power transmission coil and the power reception coil. The loss due to the inter-distance increases. In addition, since reinforcing steel bars are interposed between the power transmission coil and the power receiving coil on the electric vehicle side, the reinforcing steel bars not only reduce power transmission efficiency, but also generate eddy currents in the steel bars due to the magnetic field generated by the power transmission coils. As a result, there is also the problem that the reinforcing bars themselves generate heat and reduce power transmission efficiency.

The present disclosure has been made in view of the above circumstances, and regarding the installation of a contactless power supply system on a road, the pavement structure and , aims to provide a paving method.

The pavement structure of the present disclosure includes:
A pavement structure for installing on a road a contactless power supply system comprising a power transmission coil for contactlessly supplying power to a mobile object capable of traveling on the road while the mobile object is traveling or stopped,
a case that is formed in a container shape that is open upward, houses the power transmission coil, and is embedded in the pavement layer of the road;
a lid member that closes the upper opening of the case and whose upper surface forms part of the paved surface of the road,
The lid member is characterized by being made of fiber-reinforced resin or fiber-reinforced cement composite material.

Another aspect of the pavement structure of the present disclosure includes:
It is preferable to further include a holding member that holds the power transmission coil adjacent to or in close proximity to the lower surface of the lid member.

Another aspect of the pavement structure of the present disclosure includes:
It is preferable to further include 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.

Another aspect of the pavement structure of the present disclosure includes:
It is preferable that the lid member is formed so as to extend outward from the case.

Another aspect of the pavement structure of the present disclosure includes:
further comprising a flange projecting outward from the upper end of the case,
It is preferable that the case and the cover member are fixed by being fastened together by bolts that are inserted from the lower surface side of the flange portion and are not exposed on the upper surface of the cover member.

Another aspect of the pavement structure of the present disclosure includes:
It is preferable that a fire spread prevention material is provided in the case.

Another aspect of the pavement structure of the present disclosure includes:
It is preferable that an upper surface of the lid member is provided with a sloped surface that slopes downward from the center side of the lid member toward the peripheral edge thereof.

In another aspect of the pavement structure of the present disclosure,
It is preferable that the inclined surface is provided with a plurality of grooves extending along the inclined direction. Also, in another aspect of the pavement structure of the present disclosure,
It is preferable that a plurality of grooves are provided on the upper surface of the lid member, and that the groove bottom surfaces of the grooves are inclined downward from the center side of the lid member toward the peripheral edge thereof.

The paving method of the present disclosure includes:
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,
embedding the case in the pavement layer of the road;
installing a temporary lid member having a flat upper surface that becomes the same height as the paved surface of the road when installed on the upper part of the case, on the upper part of the case;
rolling the pavement layer of the road with a rolling compactor;
a step of removing the temporary lid member after rolling by the rolling compactor;
and installing the lid member on top of the case from which the temporary lid member has been removed.

According to the pavement structure and pavement method of the present disclosure, it is possible to effectively improve the power transmission efficiency while ensuring the strength of the pavement surface in relation to the installation of the contactless power supply system on the road.

BRIEF DESCRIPTION OF THE DRAWINGS It is a typical whole block diagram which shows the non-contact electric power feeding system installed in a road using the pavement structure which concerns on this embodiment, and the pavement method. It is a typical longitudinal section showing the pavement structure concerning a first embodiment. FIG. 5 is a schematic vertical cross-sectional view showing another aspect of the lid member holding structure according to the first embodiment. FIG. 5 is a schematic vertical cross-sectional view showing another aspect of the lid member holding structure according to the first embodiment. It is a typical longitudinal section showing the pavement structure concerning a second embodiment. It is a typical perspective view which shows the cover member of the pavement structure which concerns on 2nd embodiment. FIG. 8 is a schematic perspective view showing another aspect of the lid member of the pavement structure according to the second embodiment; It is a typical longitudinal section showing the pavement structure concerning a third embodiment. FIG. 11 is a schematic longitudinal sectional view showing another aspect of the lid member of the pavement structure according to the third embodiment; It is a typical longitudinal section showing the pavement structure concerning a fourth embodiment. It is a typical longitudinal section showing the pavement structure concerning a fifth embodiment. It is a flow figure explaining the pavement method concerning this embodiment. It is a typical longitudinal section explaining the paving method concerning this embodiment. FIG. 11 is a schematic perspective view showing a lid member of a pavement structure according to another embodiment;

A pavement structure and a pavement method according to the present embodiment will be described below with reference to the accompanying drawings. The same parts are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Contactless power supply system]
FIG. 1 is a schematic overall configuration diagram showing a non-contact power supply system 100 installed on a road using a pavement structure and a pavement method according to this embodiment. In FIG. 1, reference numeral 200 schematically shows an example of an electric vehicle that receives power from the contactless power supply system 100. As shown in FIG.

First, the outline 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 power transmission coil 110 of contactless power supply system 100 , which will be described later, a magnetic field is generated.

Rectifier 220 converts alternating current from power receiving coil 210 to direct current. The DC current converted by the rectifier 220 is supplied to the storage battery 230 to be stored, or supplied to electrical components (not shown). The inverter 240 converts the direct current supplied from the storage battery 230 into alternating current and supplies the alternating current to the motor generator 250 . Inverter 240 adjusts the driving force by appropriately adjusting the voltage supplied to motor generator 250 according to a command from a control unit (ECU) (not shown) mounted on electric vehicle 200 .

The contactless power supply system 100 is installed on a road R on which an electric vehicle 200 travels. The contactless power supply system 100 includes a plurality of power transmission coils 110, a plurality of power transmission circuits 120 that supply AC current to each of the power transmission coils 110, and a power supply device 130 that supplies DC current to each of the power transmission circuits 120. I have.

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

As described above, contactless power supply system 100 causes power receiving coil 210 to generate alternating current by a magnetic field generated from power transmitting coil 110 . Therefore, in order to improve power transmission efficiency, it is desirable to shorten these distances as much as possible. In order to shorten the distance between the power transmission coil 110 and the power reception coil 210, the power transmission coil 110 can be protruded from the road surface. must also be installed below (e.g. pavement layer). However, if the power transmission coil 110 is directly embedded in the pavement layer without being housed in a case or the like, there is a problem that maintainability after installation is deteriorated.

Therefore, 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 the case and the lid member in the pavement layer. In this case, since the lid member constitutes a part of the paved surface, it is necessary to have strength to withstand the load and the like. If the cover member is made of reinforced concrete in order to ensure the strength of the cover member, there is a problem that not only does the reinforcing steel reduce the power transmission efficiency, but also the reinforcing steel itself heats up due to the magnetic field, which causes a decrease in power transmission efficiency. In addition, in order to prevent the reinforcement from corroding due to cracks caused by the neutralization of the concrete, it is necessary to secure a certain thickness of the concrete cover, which increases the distance between the coils 110 and 210. There are also challenges.

The paving structure and paving method of the present embodiment are designed to comprehensively solve these problems by devising the structure, shape, and material of the lid member and case. Details of the pavement structure of the present embodiment will be described below.

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

The case 10 includes a bottom wall portion 11 and side wall portions 12, and has a container shape that opens upward. The size of the case 10 may be large enough to accommodate at least one power transmission coil 110, and may 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 can be formed of, for example, a resin material.

The case 10 is embedded in the pavement layer (for example, asphalt layer) of the road R so that the upper end of the case 10 is offset downward from the pavement surface of the road R by the thickness of the lid member 20 . That is, when the cover member 20 closes the upper opening of the case 10 embedded in the pavement layer, the upper surface of the cover member 20 becomes a part of the pavement surface of the road R. Therefore, the dimension of the case 10 and the lid member 20 in the road width direction is set 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 paved surface does not interfere with the left and right wheels of the vehicle. degree). Moreover, since the case 10 is embedded in the portion corresponding to the foundation in the cross-sectional structure of the road, it is preferable to secure a predetermined depth.

The lid member 20 is formed in a substantially rectangular shape when viewed from above, and closes the upper opening of the case 10 . The method of fixing the lid member 20 and the case 10 is not particularly limited, and they can be fixed with bolts, for example. When bolts are used, through holes are formed in the cover member 20 at a plurality of locations to penetrate in the vertical direction, female screw holes are drilled in the upper end of the case 10, and the bolts are inserted into the through holes and screwed into the female screw holes. It should be fixed by fitting them together. A seal packing (not shown) made of resin may be interposed between the lid member 20 and the case 10 to ensure water-tightness in the gap between them.

In this embodiment, the power transmission coil 110 is arranged adjacent to or in close proximity to the lower surface of the lid member 20 . As shown in FIG. 2 , a structure in which the power transmission coil 110 is adjacent to or close to the lower surface of the lid member 20 is provided with a holding member 30 extending downward from the lower surface of the lid member 20 , and the power transmission coil 110 is attached to the holding member 30 . Just do it. 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 upper surface of the holding member 31 may support the power transmission coil 110 . 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 upper surface of the holding member 32 may support the power transmission coil 110 . In any of these cases, it is preferable to bring the power transmission coil 110 into contact with the lower surface of the lid member 20 or to support the lower surface of the lid member 20 with a small clearance.

By arranging the power transmitting coil 110 adjacent to or in close proximity to the lower surface of the lid member 20 in this manner, the power transmitting coil 110 and the power receiving coil are arranged more closely than when the power transmitting coil 110 is placed on the bottom wall portion 11 of the case 10 . 210 can be significantly shortened. By moving power transmitting coil 110 closer to power receiving coil 210, power transmission efficiency can be reliably improved.

Here, since the lid member 20 constitutes a part of the pavement layer of the road R, it is necessary to secure strength that can withstand the load and the like when the vehicle travels. On the other hand, if the lid member 20 is made of reinforced concrete, it is not preferable because the reinforcing bars reduce power transmission efficiency and the reinforcing bars generate heat due to the magnetic field. Moreover, as described above, in order to prevent corrosion of reinforcing bars, it is necessary to secure a certain thickness of the concrete cover. From this point of view, the lid member 20 of the present embodiment can ensure strength without using reinforcing bars and is made of a fiber-reinforced resin that does not require a cover thickness like reinforced concrete. Glass fiber reinforced resin is preferable as the fiber reinforced resin, and thermoplastic polypropylene resin, thermosetting vinyl ester resin and the like can be mentioned as the resin to be combined.

Forming the lid member 20 from the fiber-reinforced resin in this manner ensures the strength (load resistance) required for the pavement layer. In addition, by using the fiber-reinforced resin for the lid member 20, it is possible to form the lid member 20 thinly, so that the power transmission coil 110 arranged adjacent to the lower surface of the lid member 20 and the power reception coil 210 on the vehicle side can be connected. It is also possible to effectively shorten the distance. In addition, since the lid member 20 made of fiber-reinforced resin does not include reinforcing bars for reinforcement, the power transmission coil 110 is effective for the road R without a decrease in power transmission efficiency due to the reinforcing bars and heat generation of the reinforcing bars due to a magnetic field. can be installed.

[Second embodiment]
FIG. 5 is a schematic longitudinal sectional view showing the pavement structure according to the second embodiment. In the pavement structure of the second embodiment, the shape of the lid member 20 of the first embodiment is devised to improve the drainage of the upper surface of the lid member 20 . Since the same structure as the holding structure of the first embodiment (see FIGS. 2 to 4) can be applied to the holding structure of the power transmission coil 110 housed in the case 10, the explanation thereof will be omitted below.

As shown in FIG. 5, the lid member 20 of the second embodiment is formed in a triangular shape that is upwardly convex in a vertical cross-sectional view, and is inclined from the central portion C in the width direction toward the peripheral edge portion E. It has a face 21 . The height of the central portion C (slope of the inclined surface 21) is not particularly limited, but is preferably set within a range that does not affect the running of the vehicle even when the vehicle straddles the lid member 20 when changing lanes.

As the shape having the inclined surface 21, for example, as shown in FIG. A triangular strip having a pair of inclined surfaces 21 inclined toward the peripheral edge portion E with a ridgeline L extending through the edge as a boundary may also be used.

Each inclined surface 21 is provided with a plurality of grooves 22 extending parallel to each other along the inclined direction. These plural concave grooves 22 function as drain grooves for positively flowing rainwater or the like along the inclined surface 21 from the central portion C side toward the peripheral edge portion E. As shown in FIG.

In this manner, the inclined surface 21 is provided on the upper surface of the lid member 20 forming the paved surface of the road R, and the concave groove 22 as a drain groove is provided on the inclined surface 21, so that rainwater, etc. Accumulation can be effectively prevented. By preventing rainwater from accumulating, it is possible to reliably suppress a decrease in power transmission efficiency from power transmitting coil 110 to power receiving coil 210 even in rainy weather. Further, by providing the recessed groove 22 on the inclined surface 21, it becomes possible to effectively prevent the vehicle from slipping when straddling the lid member 20. - 特許庁The shape of the upper surface of the lid member 20 is not limited to the shape shown in FIGS. good too.

[Third embodiment]
FIG. 8 is a schematic longitudinal sectional view showing the pavement structure according to the third embodiment. In the pavement structure of the third embodiment, the lid member 20 is expanded in the width direction more than in the first embodiment, and the lid member 20 and the case 10 are fixed with bolts B from the back side, so that the bolts B extend on the pavement surface. It is designed not to be exposed to Details of the third embodiment will be described below.

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

The case 10 includes a container-shaped case body 13 having a bottom wall portion 11 and side wall portions 12 . Further, the case main body 13 is provided with a rectangular frame-shaped flange portion 14 projecting 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 . Although the material of the case 10 is not particularly limited, it can be made of a resin material or the like as in the first embodiment.

A lid member 20 is seated on the upper surface of the flange portion 14 . The cover member 20 is provided with a female screw hole 20A (or an embedded nut) at a position corresponding to the bolt insertion hole 15 of the flange portion 14 . Like the first embodiment, the lid member 20 is made of fiber-reinforced resin, preferably glass-fiber reinforced resin, which can ensure the strength of the pavement layer.

In the third embodiment, the lid member 20 is sized to extend outward beyond the flange portion 14 . That is, when the lid member 20 is seated on the flange portion 14 and fixed, the portion of the lower surface of the lid member 20 on the outer peripheral side protrudes outside the flange portion 14 . The projection amount X of the lower surface of the lid member 20 is not particularly limited, but it is preferably twice or more 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 protruding outside the flange portion 14 .

The backing member 40 has a rectangular annular shape that can be fitted into the case body 13 . The outer peripheral dimension of the backing member 40 is formed to be approximately equal to the outer peripheral dimension of the lid member 20 . The outer peripheral surface of the backing member 40 is provided with a tapered surface 41 that slopes inward from the upper end to the lower end. An 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 . The height dimension (thickness) of the backing member 40 is not particularly limited, but is formed so as to be thicker than the flange portion 14 and lower than the case body 13 . Although the material of the backing member 40 is not particularly limited, it can be made of, for example, a fiber-reinforced resin.

The backing 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 hole 43 from the back side and fastening the backing member 40 together with the flange portion 14 and the lid member 20, the case 10, the lid member 20 and the backing member 40 are united. can be integrated as

When the backing member 40 is integrated with the case 10 and the lid member 20 , the top surface of the backing member 40 is pressed against the bottom surface of the lid member 20 that protrudes outward from the flange portion 14 . In this manner, the lower surface of the lid member 20 and the upper surface of the backing member 40 are brought into surface contact in a substantially rectangular shape over a wide area outside the case 10, so that the lid member 20 is brought into contact only with the flange portion 14. Compared to the structure, it is possible to secure a longer water infiltration path. In addition, since the bolt B is fixed by inserting it from the back side of the backing member 40, the bolt B is not exposed to the pavement surface. It becomes possible to effectively prevent the intrusion of water.

In the third embodiment shown in FIG. 8, the upper surface of the lid member 20 is flat, but as shown in FIG. It can also be formed in a triangular shape with a convex shape. Also in this case, although illustration is omitted, it is desirable to provide the same recessed groove 22 as in the second embodiment on the inclined surface 21 .

[Fourth embodiment]
10A to 10C are schematic longitudinal sectional views showing a pavement structure according to the fourth embodiment. In the fourth embodiment, at least the lid member 20 is made of a multi-microcracked fiber-reinforced cementitious composite material (hereinafter simply referred to as HPFRCC). This HPFRCC has improved strength by randomly blending short fibers in a cement matrix. Since the same structure as the holding structure of the first embodiment (see FIGS. 2 to 4) can be applied to the holding structure of the power transmission coil 110 housed in the case 10, the explanation thereof will be omitted below.

In FIG. 10A, the case 10 is made of a resin material and the cover member 20 is made of HPFRCC. The resin case 10 and the lid member 20 made of HPFRCC may be manufactured in advance at a factory and assembled at the site, or the lid member 20 may be cast on site. In the case of cast-in-place, the cover member 20 is formed by placing a formwork 27 for the lid on the upper part of the case 10 and placing the HPFRCC into the formwork 27 . The formwork 27 may be left in place or removed. In the case of leaving, the mold 27 may be made of a non-conductive material. The lid member 20 is preferably provided with hooks (not shown) for hooking a tool or the like when opening the lid member 20 for maintenance.

In FIG. 10B, the case 10 is made of a resin material, the cover member 20 is made of HPFRCC, and the size of the cover member 20 is such that the cover member 20 expands outward from the case 10 . The resin case 10 and the lid member 20 made of HPFRCC may be manufactured in advance at a factory and assembled at the site, or the lid member 20 may be cast on site. In the case of cast-in-place, the cover member 20 may be formed by placing a formwork 27 for the lid expanded over the case 10 above the case 10 and placing HPFRCC in the formwork 27 . The formwork 27 may be left in place or removed. In the case of leaving, the mold 27 may be made of a non-conductive material. If the cover member 20 is expanded in this manner, a long water infiltration path can be ensured and water intrusion into the case 10 can be effectively prevented as in the third embodiment. It becomes possible.

In FIG. 10C, both the case 10 and the cover member 20 are made of HPFRCC. The HPFRCC case 10 and the lid member 20 may be manufactured in advance at a factory and brought to the site, or both of them may be cast on site. In the case of casting on site, the power transmission coil 110 is housed in a simple resin case 10A, a lid mold 27 and a case mold 28 are installed, and HPFRCC is hammered into these molds 27 and 28. The case 10 and the lid member 20 may be formed by providing them. These forms 27 and 28 may be left or removed. In the case of leaving, the forms 27, 28 may be made of a non-conductive material.

According to the pavement structure of the fourth embodiment described in detail above, at least the cover member 20 of the case 10 and the cover member 20 is made of HPFRCC, so that the pavement layer of the cover member 20 can be It is possible to reliably ensure the strength as. As a result, the power transmission coil 110 can be effectively installed on the road R without a decrease in power transmission efficiency due to reinforcing bars and heat generation of the reinforcing bars due to a magnetic field.

Although detailed illustration is omitted, in the fourth embodiment shown in FIGS. It is also possible to form a triangular shape that protrudes upward in a vertical cross-sectional view, and to provide a concave groove for draining on each inclined surface.

[Fifth embodiment]
FIG. 11 is a schematic longitudinal sectional view showing the pavement structure according to the fifth embodiment. In the pavement structure of the fifth embodiment, the cover member 20 is made of glass fiber reinforced resin, and a support member 50 is provided inside the case 10 to support the cover member 20 from below.

The lid member 20 of the fifth embodiment is made of glass fiber reinforced resin. Examples of the resin to be combined include thermoplastic polypropylene resin and thermosetting vinyl ester resin. By forming the lid member 20 from a high-strength glass fiber reinforced resin in this manner, the thickness of the lid member 20 can be reduced while the load resistance of the lid member 20 is ensured, and the power transmission efficiency can be improved. It becomes possible.

In this embodiment, a columnar support member 50 is provided in the case 10 so as to stand upward from the bottom wall portion 11 and support 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 of the cover member 20 near the center where it is most flexible.

Although the material of the support member 50 is not particularly limited, it is preferably made of a non-magnetic resin material so as not to affect the magnetic field of the power transmission coil 110 . Glass fiber reinforced resin, for example, can be used as the non-magnetic resin material. The support member 50 may be fixed to the bottom wall portion 11 by bolts or by 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 may be in contact with the lower surface of the lid member 20 .

By supporting the lower surface of the lid member 20 with the support member 50 in this manner, the thickness of the lid member 20 can be made as thin as possible compared to a structure in which the lid member 20 is not supported, and power transmission efficiency can be more reliably improved. it becomes possible to

A fire spread prevention material 60 is installed inside the case 10 so as to surround the power transmission coil 110 . The fire spread prevention material 60 is formed containing, for example, non-conductive calcium carbonate. By providing the fire spread prevention material 60 inside the case 10 in this way, even if foreign matter such as metal that enters the case 10 generates heat due to the magnetic field, the cover member 20 and the case 10 are effectively melted by combustion. can be effectively prevented. Further, in the fifth embodiment in which the power transmission coil 110 is enclosed by the fire spread prevention material 60 and housed in the case 10 , the power transmission coil 110 can be held adjacent to or close to the lid member 20 by the fire spread prevention material 60 . can. Therefore, the holding structure (see FIGS. 2 to 4) for the power transmission coil 110 as exemplified in the first embodiment can be omitted, and the holding structure can be simplified.

[Paving method]
Next, a paving method according to this embodiment will be described with reference to FIGS. 12 and 13. FIG. In addition, the paving method of the present embodiment can be applied to installation construction of a pavement structure (see FIGS. 5 and 9) having a triangular shape in which the cover member 20 protrudes upward.

In step S100, the case 10 is buried in the pavement layer of the road R, and in step S110, the upper opening of the case 10 is closed with the temporary cover member 300 (see FIG. 12(A)). Here, the temporary lid member 300 has a rectangular plate shape, and the upper surface thereof 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 paved surface of the road R. The temporary cover 300 may be made of resin or steel as long as it has enough strength to withstand rolling pressure by a rolling compactor.

After the temporary cover member 300 is installed, in step S120, the pavement surface is subjected to rolling compaction using a rolling compactor 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 paved surface of the road R, it is possible to uniformly apply rolling force to the paved surface of the road R and the upper surface of the temporary lid member 300. Become.

When the rolling compaction work is completed, in step S130, the temporary lid 300 is removed from the case 10 (see FIG. 12(B)). Here, it is desirable that the temporary lid member 300 be devised to improve the releasability from the asphalt. As a device for improving releasability, for example, a diagonal notch is provided in the corner of the temporary lid member 300, or the end surface of the temporary lid member 300 is treated to reduce adhesion to asphalt. is mentioned. The removed temporary lid member 300 can be reused for the next construction until damage or the like occurs.

After the temporary lid member 300 has been removed, in step S140, the proper lid member 20 is fitted to close the upper opening of the case 10, thereby completing the installation of the power transmission coil 110 (FIG. 12(C)). reference).

Thus, before installing the triangular regular lid member 20, by installing the flat temporary cover 300 and performing rolling compaction, the rolling pressure by the roller compactor is uniform to the road R. can be hung on By achieving uniform rolling pressure, it is possible to improve the pavement quality of the road R.

Note that the timing of housing the power transmission coil 110 in the case 10 may be either before installing the temporary lid member 300 in step S110 or immediately before fitting the regular lid member 20 in step S140. In addition, if the installation of the power transmission coil 110 is not necessary for the time being, once the processes up to step S140 are finished, when the installation of the power transmission coil 110 becomes unnecessary, the normal cover member 20 can be removed. do it.

[others]
It should be noted that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified and implemented without departing from the gist of the present disclosure.

For example, the support member 50 and the fire spread prevention material 60 of the fifth embodiment can also be applied to the first, second, third, and fourth embodiments. In the above embodiment, the power transmission coil 110 of the contactless power supply system 100 transmits power to the power reception coil 210 arranged on the bottom of the vehicle body of the electric vehicle 200. It can also be applied to a power supply system that performs In this case, the case 10 and the lid member 20 may be installed on both sides of the road R on which the tires of the electric vehicle 200 pass.

In the first, second, third, and fifth embodiments, at least the lid member 20 may be made of HPFRCC, and in the fourth embodiment, at least the lid member 20 may be made of fiber. It may be formed of a reinforcing resin material.

Further, as shown in FIG. 14, a plurality of grooves 22 are provided in parallel in the width direction or the longitudinal direction of the road on a lid member 20 having a flat upper surface, and the groove bottom surface of each groove 22 is a lid. It may be formed so as to be inclined downward from the center side of the member 20 toward the peripheral edge. Also in this case, rainwater or the like on the upper surface of the lid member 20 flows along the slope of the groove bottom surface of the recessed groove 22, so that it is possible to effectively ensure water drainage. In addition, in the case of the configuration shown in FIG. 14, since the upper surface is flat, there is an advantage that even if the wheels pass over the upper surface, the influence on the tires (for example, the influence on the running behavior of the vehicle, etc.) can be reduced.

DESCRIPTION OF SYMBOLS 10... Case 11... Bottom wall part 12... Side wall part 13... Case main body 14... Flange part 20... Lid member 21... Inclined surface 22... Groove 30, 31, 32... Holding member 40 Backing member 50 Support member 60 Fire spread prevention material 100 Contactless power supply system 110 Power transmission coil 200 Electric vehicle 210 Power reception coil 300 Temporary cover member B Bolt

Claims (10)

A pavement structure for installing on a road a contactless power supply system comprising a power transmission coil for contactlessly supplying power to a mobile object capable of traveling on the road while the mobile object is traveling or stopped,
a case that is formed in a container shape that is open upward, houses the power transmission coil, and is embedded in the pavement layer of the road;
a lid member that closes the upper opening of the case and whose upper surface forms part of the paved surface of the road,
A pavement structure, wherein the lid member is made of a fiber-reinforced resin or a fiber-reinforced cement composite material. The pavement structure according to claim 1, further comprising a holding member that holds the power transmission coil adjacent to or close to the lower surface of the lid member. The pavement structure according to claim 1 or 2, 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 pavement structure according to any one of claims 1 to 3, wherein the lid member is formed by extending outward from the case. further comprising a flange projecting outward from the upper end of the case,
5. The pavement structure according to claim 4, wherein the case and the lid member are fixed by being tightened together by bolts that are inserted from the lower surface side of the flange portion and are not exposed on the upper surface of the lid member. The pavement structure according to any one of claims 1 to 5, wherein a fire spread prevention material is provided in the case. The pavement structure according to any one of claims 1 to 6, wherein an upper surface of the lid member is provided with a sloped surface that slopes downward from the center side of the lid member toward the peripheral edge thereof. The pavement structure according to claim 7, wherein the inclined surface is provided with a plurality of grooves extending along the direction of inclination. A plurality of grooves are provided on the upper surface of the lid member, and the groove bottom surfaces of the grooves are inclined downward from the center side of the lid member toward the periphery thereof. 7. The pavement structure according to any one of 6. A paving method for installing the power transmission coil on the road using the paving structure provided with the lid member according to claim 7 or 8,
embedding the case in the pavement layer of the road;
installing a temporary lid member having a flat upper surface that becomes the same height as the paved surface of the road when installed on the upper part of the case, on the upper part of the case;
rolling the pavement layer of the road with a rolling compactor;
a step of removing the temporary lid member after rolling by the rolling compactor;
and installing the lid member on top of the case from which the temporary lid member has been removed.

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