Pavement structure and water pumping method in pavement structure

Abstract

To provide a pavement structure capable of improving convenience related to water pumping in wet pavement, and a water pumping method in the pavement structure.SOLUTION: A pavement structure includes a photovoltaic power generator and a pump driven by power supply from the photovoltaic power generator. The pavement structure supplies water stored in a storage area to a pumping area of wet pavement by driving the pump.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a paving structure and a water pumping method in the paving structure.

Background Art

[0002] Conventionally, for example, as shown in Patent Document 1, a paving structure having a wet paving capable of taking heat countermeasures by keeping the paving surface in a wet state has been disclosed. In such a paving structure, for example, a storage area capable of storing water such as rainwater or sprinkling water, and a pumping area for pumping water from the storage area to the paving surface are provided. Further, in such a paving structure, a pumping member may be disposed inside the paving, and water can be sufficiently supplied from the storage area to the pumping area.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in such a paving structure, since a pumping member must be disposed inside the paving, the construction process increases. Thus, it is desired to improve the convenience regarding water pumping in wet paving.

Means for Solving the Problems

[0005] The paving structure for solving the above problems includes a solar power generation device and a pump driven by power supplied from the solar power generation device. By driving the pump, water stored in the storage area is supplied to the pumping area of the wet paving.

[0006] In the pumping method in the pavement structure for solving the above problems, a pump is driven by power supplied from a solar power generation device to supply water stored in a storage area to a pumping area of the wet pavement, and the water supplied to the pumping area of the wet pavement is pumped to the surface layer of the wet pavement.

Advantages of the Invention

[0007] According to the present invention, the convenience regarding pumping in the wet pavement can be improved.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] [First Embodiment] An embodiment of a pavement structure and a pumping method in the pavement structure will be described. <Pavement Structure 10> As shown in FIGS. 1 and 2, the pavement structure 10 is a structure that includes at least the pavement constituting the road. The pavement structure 10 includes a wet pavement 11. The wet pavement 11 is a pavement capable of pumping the stored water to the wet pavement surface 11A. The wet pavement surface 11A is the surface on which the wet pavement 11 is constructed. In this way, the wet pavement 11 can keep the wet pavement surface 11A in a wet state and suppress the evaporation of water and the rise in temperature of the wet pavement surface 11A. The wet pavement 11 may be provided on the sidewalk 90. In particular, the wet pavement 11 may be a pavement provided on the first sidewalk 91 far from the road lane 93 in the sidewalk 90.

[0010] <Wet pavement 11> As shown in Fig. 2, the wet pavement 11 includes a pumping area 20. The pumping area 20 is an area for pumping water to keep the wet pavement surface 11A in a wet state. The pumping area 20 supplies water to the wet pavement surface 11A by capillary action.

[0011] In the wet pavement 11, a pumping and water retaining block 21, a sand cushion 22, a water conducting sheet 23, a water supply pipe 24, asphalt 25, crushed stones 26, broken stones 27 and a civil engineering sheet 28 are laminated in order from the upper layer, and the roadbed is located in a lower layer than the civil engineering sheet 28. As a specific example of the wet pavement 11, the thickness of the pumping and water retaining block 21 may be 60 mm, the thickness of the sand cushion 22 may be 30 mm, the thickness of the asphalt 25 may be 30 mm, and the thickness of the crushed stones 26 may be 100 mm. The pumping area 20 may include the pumping and water retaining block 21, the sand cushion 22 and the water conducting sheet 23.

[0012] The pumping and water retaining block 21 constitutes the surface layer of the wet pavement 11. The pumping and water retaining block 21 is a block for retaining water. In particular, the pumping and water retaining block 21 is a block for retaining the pumped water. Specifically, the pumping and water retaining block 21 can spread the absorbed water over a wide range mainly by capillary action through continuous passages formed by fine pores inside. The pumping and water retaining block 21 can also allow rainwater to penetrate into the roadbed during rainfall.

[0013] The sand cushion 22 constitutes the base layer of the wet pavement 11. The sand cushion 22 is a sand material for adjusting the height of the pumping and water retaining block 21 by supporting the pumping and water retaining block 21 from below. The sand cushion 22 can efficiently diffuse water.

[0014] The water-permeable sheet 23 is a sheet having water retention properties. The water-permeable sheet 23 supplies water to the water-lifting and water-retaining blocks 21 and the sand cushion 22. The water-permeable sheet 23 can efficiently diffuse the retained water. The water-permeable sheet 23 may be arranged such that its ends face upward. Thereby, water can be guided upward by the water-permeable sheet 23. Therefore, the water-lifting function can be improved.

[0015] The asphalt 25 constitutes the base layer of the permeable pavement 11. The asphalt 25 supports the water-permeable sheet 23 and the water supply pipe 24. The crushed stone 26 and the chipped stone 27 constitute the roadbed. Specifically, the crushed stone 26 constitutes the upper layer of the roadbed, and the chipped stone 27 constitutes the lower layer of the roadbed. The crushed stone 26 and the chipped stone 27 have water permeability. The crushed stone 26 and the chipped stone 27 may be, for example, crusher run. The civil engineering sheet 28 is a sheet used for purposes such as preventing suction, preventing burial and settlement, preventing washout, stabilizing soft ground, and stabilizing buried objects.

[0016] As shown in FIGS. 1 and 2, the water supply pipe 24 is arranged in the permeable pavement 11. The water supply pipe 24 is arranged in a mesh pattern in the permeable pavement 11, but may be arranged in a single stroke. The water supply pipe 24 is connected to a pump 41 described later. The water supply pipe 24 supplies water from the pump 41 to the water-permeable sheet 23. That is, the water supply pipe 24 is a member for supplying water from the pump 41 to the water-lifting area 20.

[0017] <Permeable pavement 12> The pavement structure 10 includes a permeable pavement 12. The permeable pavement 12 is a pavement for allowing rainwater to penetrate into the roadbed during rainfall. The permeable pavement 12 stores the water that has penetrated into the roadbed. The permeable pavement surface 12A is the surface on which the permeable pavement 12 is constructed. The permeable pavement 12 may be a pavement provided on the roadway 93. The permeable pavement 12 may be a pavement provided on the second sidewalk 92 close to the roadway 93 among the sidewalks 90.

[0018] As shown in Fig. 2, in the permeable pavement 12, porous concrete 31, crushed stone 32, split pebbles 33, and a civil engineering sheet 34 are laminated in order from the upper layer, and the roadbed is located in a lower layer than the civil engineering sheet 34. As a specific example of the permeable pavement 12, the thickness of the porous concrete 31 may be 150 mm, and the thicknesses of the crushed stone 32 and the split pebbles 33 may be 350 mm.

[0019] The porous concrete 31 constitutes the surface layer and the base layer of the permeable pavement 12. The porous concrete 31 is porous concrete and has water permeability. The crushed stone 32 and the split pebbles 33, similar to the crushed stone 26 and the split pebbles 27, constitute the roadbed and have water permeability.

[0020] The permeable pavement 12 is provided with a storage area 35. The storage area 35 is located in a lower layer than the civil engineering sheet 34. The storage area 35 is located below the roadbed. The storage area 35 is located below the water supply well 13 described later. The storage area 35 is concave with respect to the roadbed. The storage area 35 may be a cauldron field. The storage area 35 may be located above the civil engineering sheet 34 or may be located within the roadbed. In this case, the storage area 35 may be provided within the roadbed by arranging partitions.

[0021] The storage area 35 stores the water that has penetrated into the permeable pavement 12. In particular, the storage area 35 penetrates into the permeable pavement 12. The storage area 35 may be provided at predetermined intervals along the direction in which the permeable pavement 12 extends.

[0022] The permeable pavement 12 is provided with a water supply well 13. The water supply well 13 is provided so as to extend in the vertical direction. The water supply well 13 is configured to communicate the storage area 35 with a pump 41 described later. The water supply well 13 is sized to accommodate the pump 41 and the pumping hose described later, but may also be sized such that an operator performing maintenance can pass through.

[0023] The water supply well 13 may have a double structure in which the first pipe 13A is housed in the second pipe 13B. The first pipe 13A may be a rigid vinyl wire pipe. The first pipe 13A may be a perforated pipe. The first pipe 13A extends from the roadbed to the permeable paving surface 12A that constitutes the second sidewalk 92. A lid is attached to the first pipe 13A at the permeable paving surface 12A that constitutes the second sidewalk 92. The first pipe 13A houses a pump 41 described later.

[0024] The second pipe 13B may be a rigid vinyl wire pipe. The second pipe 13B is located below the bottom of the roadbed. The second pipe 13B is located below the civil engineering sheet 34. The second pipe 13B may or may not be a perforated pipe. In the case of a cohesive soil roadbed, the second pipe 13B may not be a perforated pipe, and a water permeation prevention and suction prevention sheet may be wound around the bottom. In the case of a sandy roadbed, the second pipe 13B is a perforated pipe, and water may be allowed to penetrate the surroundings and the stored water may be gently discharged into the ground.

[0025] In this way, the storage area 35 is located in the area surrounded by the double structure composed of the first pipe 13A and the second pipe 13B. The storage area 35 may be located below the roadbed. The storage area 35 may be located below the civil engineering sheet 34. For this reason, the water that has penetrated into the permeable pavement 12 is stored in the storage area 35.

[0026] In the water supply well 13, the gap between the first pipe 13A and the second pipe 13B may be filled with crushed stone 32. Thereby, it is possible to suppress foreign matter such as small stones or garbage from entering the storage area 35 through the water supply well 13. The depth of the water supply well 13 is preferably more than twice the thickness from the paving surface to the roadbed.

[0027] A curb 14 may be provided between the sidewalk 90 and the roadway 93. The curb 14 may be provided on the permeable pavement 12. A base member 15 is provided below the curb 14. The base member 15 is configured to support the curb 14. The roadway 93 has a road surface lower than the sidewalk 90 and the curb 14, but is not limited thereto. The sidewalk 90 has a road surface at the same height as the curb 14, but is not limited thereto.

[0028] <Photovoltaic power generation device 40> As shown in FIGS. 1 and 2, the pavement structure 10 includes a photovoltaic power generation device 40. The pavement structure 10 may include a plurality of photovoltaic power generation devices 40. The pavement structure 10 may include a plurality of photovoltaic power generation devices 40 for one pump 41 described later.

[0029] The photovoltaic power generation device 40 is a device that converts sunlight into electric power using solar cells. The photovoltaic power generation device 40 is provided on the permeable pavement 12. Specifically, the photovoltaic power generation device 40 is provided on the curb 14. The photovoltaic power generation device 40 is provided so as to be exposed upward from the curb 14. In this way, the photovoltaic power generation device 40 is provided between the sidewalk 90 and the roadway 93. Also, it can be said that the photovoltaic power generation device 40 is provided on a pavement aligned with the wet pavement 11.

[0030] <Pump 41> The pavement structure 10 includes a pump 41. The pump 41 is provided to correspond to one storage area 35. The pavement structure 10 may include a plurality of pumps 41. The plurality of pumps 41 may be provided to correspond to the plurality of storage areas 35 respectively. The pump 41 is provided in the water supply well 13. The pump 41 is provided on the upper side of the water in the pumping area 20. The pump 41 may be provided above the permeable pavement surface 12A.

[0031] As shown in FIG. 2, the pump 41 is connected to the solar power generation device 40. The pump 41 is driven by power supplied from the solar power generation device 40. The pump 41 is driven when sunlight is incident on the solar power generation device 40 at a predetermined solar irradiance or more. The pump 41 may not be driven when sunlight is incident on the solar power generation device 40 at less than the predetermined solar irradiance. The pump 41 may not be driven when no sunlight is incident on the solar power generation device 40. The pump 41 may be of a DC type. Thereby, the paving structure 10 may not include a converter for driving the pump 41.

[0032] The paving structure 10 includes a pumping section 42. The pumping section 42 is provided in the water supply well 13. The pumping section 42 is connected to the pump 41 at one end. The pumping section 42 pumps up water by driving of the pump 41. The pumping section 42 may be a suction hose or a suction pipe.

[0033] The paving structure 10 includes a filter 43. The filter 43 is attached to the other end of the pumping section 42. The filter 43 collects foreign matters such as mud, for example. The filter 43 collects foreign matters from the water stored in the storage area 35.

[0034] The pump 41 supplies water stored in the storage area 35 in the permeable paving 12 to the pumping area 20 of the wet paving 11. Specifically, the pump 41 supplies water stored in the storage area 35 to the water supply pipe 24 via the pumping section 42 and the filter 43.

[0035] The pump 41 is connected to a detection section 44 described later. The pump 41 can be driven when the detection section 44 described later detects that the amount of water stored in the storage area 35 is equal to or more than a threshold value.

[0036] <Detection section 44> The paving structure 10 includes a detection section 44. The detection section 44 detects whether the amount of water stored in the storage area 35 is equal to or more than a threshold value. The detection section 44 may be a level sensor that detects the water level, or may be a float switch, for example.

[0037] <Operation of the First Embodiment> The operation of the first embodiment will be described. As shown in FIG. 2, when the weather is sunny during the day, power generation is performed by the photovoltaic power generation device 40. Further, when the amount of water stored in the storage area 35 is equal to or greater than the threshold value, the pump 41 is driven by power supply from the photovoltaic power generation device 40. On the other hand, when the amount of water stored in the storage area 35 is less than the threshold value, the pump 41 does not operate regardless of the power supply from the photovoltaic power generation device 40.

[0038] By driving the pump 41, the water stored in the storage area 35 is pumped up through the pumping portion 42 and the filter 43. As a result, the water stored in the storage area 35 is pumped up to the pump 41 with the mud removed by the filter 43.

[0039] The water pumped up by the pump 41 is supplied to the water supply pipe 24 by driving the pump 41. The water supplied to the water supply pipe 24 is supplied to the water guide sheet 23. The water supplied to the water guide sheet 23 keeps the wet paving surface 11A of the wet paving 11 in a wet state through the capillary action via the lifting and water retaining block 21 and the sand cushion 22.

[0040] On the other hand, as shown in FIG. 3, when the weather is rainy, power generation by the photovoltaic power generation device 40 is not performed, or the power generation amount by the photovoltaic power generation device 40 is significantly reduced. As a result, even when the amount of water stored in the storage area 35 is equal to or greater than the threshold value, the pump 41 does not operate. Thus, when the weather is rainy, the pump 41 does not operate.

[0041] When the weather is rainy, the rainwater penetrates into the permeable paving 12. After the rainwater penetrates into the permeable paving 12, it is guided to the storage area 35, for example, along the civil engineering sheet 34. As a result, the rainwater is stored in the storage area 35. Of course, when the weather is rainy, the rainwater also penetrates through the wet paving 11 and the rainwater is retained.

[0042] Also, even when it is not daytime, power generation by the photovoltaic power generation device 40 does not occur, or the amount of power generated by the photovoltaic power generation device 40 significantly decreases. As a result, even when the amount of water stored in the storage area 35 is equal to or greater than the threshold value, the pump 41 does not operate. Thus, when it is not daytime, the pump 41 does not operate.

[0043] In this way, the paving structure 10 supplies the water stored in the storage area 35 to the pumping area 20 of the wet paving 11 by driving the pump 41. In particular, the paving structure 10 supplies the water stored in the storage area 35 in the permeable paving 12 to the pumping area 20 of the wet paving 11 by driving the pump 41. That is, when the pump 41 is driven by power supplied from the photovoltaic power generation device 40, the water stored in the storage area 35 of the permeable paving 12 is supplied to the pumping area 20 of the wet paving 11.

[0044] The paving structure 10 pumps the water supplied to the pumping area 20 of the wet paving 11 to the wet paving surface 11A. Also, the paving structure 10 pumps the water that has penetrated from the wet paving surface 11A to the pumping area 20 of the wet paving 11 back to the wet paving surface 11A.

[0045] <Effect of the First Embodiment> The effect of the first embodiment will be described. (1-1) The paving structure 10 includes a photovoltaic power generation device 40 and a pump 41 that is driven by power supplied from the photovoltaic power generation device 40. The paving structure 10 supplies the water stored in the storage area 35 of the permeable paving 12 to the pumping area 20 of the wet paving 11 by driving the pump 41. Therefore, compared with the conventional configuration in which a pumping member is provided in the roadbed of the wet paving 11 as the paving thickness of the wet paving 11 increases, the water stored in the storage area 35 can be supplied to the pumping area 20. As a result, without increasing the construction process, the pumping capacity can be improved by ensuring the amount of water supplied to the pumping area 20, and the paving thickness can be increased. In addition, the water storage performance of the paving can also be improved. Therefore, the convenience regarding pumping in the wet paving 11 can be improved.

[0046] In addition to this, the pump 41 is driven by power supplied from the solar power generation device 40. Therefore, there is no need to wire the pump 41 from the commercial power supply. As a result, without increasing the construction process, the pumping capacity can be improved by ensuring the amount of water supplied to the pumping area 20. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved. Furthermore, by using the solar power generation device 40, it is possible to contribute to environmental conservation.

[0047] In particular, the solar power generation device 40 performs solar power generation when the weather is sunny during the day. For this reason, in a situation where it is desired to keep the wet pavement 11 in a wet state, the pump 41 can be driven by power supplied from the solar power generation device 40. On the other hand, when it is not during the day and when the weather is not sunny, the pump 41 is not driven in a situation where there is a low necessity to keep the wet pavement 11 in a wet state. In particular, when the weather is rainy, rainwater can be stored in the storage area 35 without driving the pump 41. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0048] (1-2) The pavement structure 10 supplies the water stored in the storage area 35 in the permeable pavement 12 to the pumping area 20 of the wet pavement 11 by driving the pump 41. For this reason, the water that has permeated into the permeable pavement 12 can be sufficiently stored in the storage area 35. As a result, by driving the pump 41, the water stored in the storage area 35 can be sufficiently supplied to the pumping area 20 of the wet pavement 11. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0049] (1-3) When it is detected that the amount of water stored in the storage area 35 is equal to or greater than the threshold value, the pump 41 is drivable. For this reason, the water stored in the storage area 35 can be pumped up by driving the pump 41 so that air is not mixed in. As a result, water can be appropriately supplied to the pumping area 20 of the wet pavement 11. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0050] (1-4) The filter 43 collects the water stored in the storage area 35. For this reason, even when foreign matter such as muddy water is stored in the storage area 35, the foreign matter can be removed. In this way, the water stored in the storage area 35 can be pumped up by driving the pump 41 with the foreign matter removed. Thereby, water can be appropriately supplied to the pumping area 20 of the wet pavement 11. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0051] (1-5) The solar power generation device 40 is provided on the pavement arranged side by side with the wet pavement 11. Without narrowing the wet pavement surface 11A of the wet pavement 11, the pumping capacity can be improved by securing the amount of water supplied to the pumping area 20. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0052] (1-6) The pump 41 is provided above the storage area 35. For this reason, the efficiency of supplying water from the storage area 35 to the pumping area 20 can be improved by driving the pump 41. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0053] (1-7) The solar power generation device 40 is provided on the curb 14. For this reason, the solar power generation device 40 can be arranged without interfering with traffic. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved. Also, the solar power generation device 40 can be arranged without impairing the landscape.

[0054] (1-8) The pump 41 is provided on the side of the curb 14. For this reason, the distance between the solar power generation device 40 and the pump 41 can be shortened. Thereby, power can be efficiently supplied to the pump 41. Therefore, the convenience regarding pumping in the wet pavement 11 can be improved.

[0055] (1-9) The pump 41 is provided above the permeable pavement surface 12A. Therefore, by arranging the pump 41 at a position where it is difficult to be submerged, even when a large amount of rain falls, the submergence of the pump 41 can be suppressed. Accordingly, the convenience regarding the pumping in the wet pavement 11 can be improved.

[0056] (1-10) The water supply well 13 is provided on the sidewalk 90 and houses the pump 41. Therefore, the pump 41 and the storage area 35 can be maintained without stopping the traffic on the roadway 93. Accordingly, the convenience regarding the pumping in the wet pavement 11 can be improved.

[0057] [Second Embodiment] Next, the second embodiment will be described. In the following description, for the same configurations as those in the already described embodiments, duplicate descriptions will be omitted or simplified, and mainly the configurations different from the already described embodiments will be described.

[0058] As shown in FIGS. 4 and 5, in the second embodiment, the wet pavement 11 is provided on the sidewalk 90. In the wet pavement 11, a pumping and water retention block 21, a sand cushion 22, a water conduction sheet 23, a water supply pipe 24, asphalt 25, crushed stone 26, split chestnut stone 27, and a civil engineering sheet 28 are laminated in order from the upper layer, and the roadbed is located in a lower layer than the civil engineering sheet 28.

[0059] The wet pavement 11 includes a storage area 29. The storage area 29 is provided at a position deeper than the pumping area 20. In particular, the storage area 29 is provided below the bottom of the roadbed, but may be provided within the roadbed. The storage area 29 is located below the roadbed. The storage area 29 is located below the civil engineering sheet 28. Therefore, the water that has penetrated into the wet pavement 11 is stored in the storage area 29.

[0060] In this way, the paving structure 10 supplies water stored in the storage area 29 to the pumping area 20 of the wet paving 11 by driving the pump 41. In particular, the paving structure 10 supplies water stored in the storage area 29 of the wet paving 11 to the pumping area 20 of the wet paving 11 by driving the pump 41.

[0061] <Actions and Effects of the Second Embodiment> The actions and effects of the second embodiment will be described. (2-1) The paving structure 10 supplies water stored in the storage area 29 of the wet paving 11 to the pumping area 20 of the wet paving 11 by driving the pump 41. For this reason, even if the paving thickness of the wet paving 11 is increased, the water stored in the storage area 29 in the wet paving 11 can be sufficiently supplied to the pumping area 20 by driving the pump 41.

[0062] [Modification Example] This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non-conflicting range.

[0063] · In the first embodiment, the storage area 35 and the water supply well 13 may be provided on the side opposite to the wet paving 11 with respect to the curb 14. That is, the storage area 35 and the water supply well 13 may be provided on the roadway 93. In the first embodiment, the curb 14 may be provided so as to be higher than the wet paving 11. In the first embodiment, the curb 14 may not be provided.

[0064] · The solar power generation device 40 may be provided on the sidewalk 90. The solar power generation device 40 may be provided on the roadway 93. The solar power generation device 40 may be provided at a position different from the sidewalk 90 and the roadway 93. The solar power generation device 40 may be provided in the roadbed so as to be exposed from the paving surface.

[0065] · The pump 41 may be provided on the wet pavement 11. When a connection part or the like is provided between the wet pavement 11 and the permeable pavement 12, the pump 41 may be provided at the connection part. That is, if the pump 41 can supply water to the pumping area 20, it may be provided at an arbitrary position, for example, the wet pavement 11, a position aligned with the wet pavement 11, and the like. The pump 41 may be provided on the ground.

[0066] · The water supply pipe 24 may be provided, for example, at a joint position between a plurality of pumping and water retaining blocks 21. That is, if the water supply pipe 24 can supply water to the pumping area 20, it may be arranged at an arbitrary position.

[0067] · The wet pavement 11 is not limited to having a sand cushion 22 using sand materials. For example, it may be provided with fine-grained materials having water pumping property and water permeability instead of the sand cushion 22 by having a similar particle size distribution or the like.

[0068] · The wet pavement 11 is not limited to having the pumping and water retaining blocks 21. For example, it may be provided with any member such as porous asphalt or porous concrete instead of the pumping and water retaining blocks 21.

[0069] · The pavement structure 10 is not limited to footpaths and roadways. For example, it may be provided at any place such as at least one of a square, a sports ground, a parking lot, a loading yard, a rooftop of a building, an elevated road, and an artificial ground.

[0070] · The expression "at least any one" used in this specification means one or more of the desired options. As an example, the expression "at least any one" used in this specification means only one option or both options if the number of options is two. As another example, the expression "at least any one" used in this specification means only one option or any combination of two or more options if the number of options is three or more.

[0071] [Appendix] Next, the technical ideas that can be grasped from the above embodiments and alternative examples are added below. (A) A detection unit that detects whether the amount of water stored in the storage area is equal to or greater than a threshold value is provided. When the detection unit detects that the amount of water stored in the storage area is equal to or greater than the threshold value, the pump is drivable.

[0072] (B) A filter that collects foreign substances contained in the water stored in the storage area is provided. (C) The solar power generation device is provided on a pavement that is aligned with the wet pavement.

Explanation of Reference Numerals

[0073] 10... pavement structure, 11... wet pavement, 11A... wet pavement surface, 12... permeable pavement, 12A... permeable pavement surface, 13... water supply well, 13A... first pipe, 13B... second pipe, 14... curb, 15... base member, 20... pumping area, 21... pumping and water retention block, 22... sand cushion, 23... water conduction sheet, 24... water supply pipe, 25... asphalt, 26, 32... crushed stone, 27, 33... split chestnut stone, 28, 34... civil engineering sheet, 29, 35... storage area, 31... porous concrete, 40... solar power generation device, 41... pump, 42... pumping part, 43... filter, 44... detection unit, 90... sidewalk, 91... first sidewalk, 92... second sidewalk, 93... roadway.

Claims

1. A photovoltaic power generation device, and a pump driven by power supplied from the photovoltaic power generation device, wherein by driving the pump, water stored in a storage area is supplied to a pumping area of a wet pavement.

2. In the pavement structure according to Claim 1, by driving the pump, water stored in the storage area in a permeable pavement adjacent to the wet pavement is supplied to the pumping area of the wet pavement.

3. In the pavement structure according to Claim 1, by driving the pump, water stored in a storage area of the wet pavement deeper than the pumping area of the wet pavement is supplied to the pumping area of the wet pavement.

4. A pumping method in a pavement structure, wherein a pump is driven by power supplied from a photovoltaic power generation device to supply water stored in a storage area to a pumping area of a wet pavement, and the water supplied to the pumping area of the wet pavement is pumped to the surface layer of the wet pavement.

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