JP2008075400A - Temperature rise restraining pavement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce construction cost, while efficiently restraining a temperature rise in a pavement material with a simple structure. <P>SOLUTION: This temperature rise restraining pavement structure has a water permeable block member 10 and a water supply means for supplying water to this block member 10. The block member 10 has a road surface part 11 and at least two leg parts 12 extended downward from this road surface part 11, and an opening space part is formed between the adjacent leg parts 12 without communicating mutual lower end parts of the respective leg parts 12. The water supply means is composed of a box-shaped member 20 having an opening upper surface, and stores water in this box-shaped member 20, and supplies the water to the respective leg parts 12 by storing a lower side part of the respective leg parts 12. The water overflowing from the water supply means further permeates into a roadbed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a temperature rise suppressing pavement structure in which water is supplied to a pavement and water is evaporated to suppress a temperature rise of the pavement.

  In recent years, the heat island phenomenon in urban areas has become an environmental problem. In order to deal with such environmental problems, pavement materials have functions such as water transfer, diffusion, pumping and water retention by capillary action, wet the pavement surface, and the road surface by the heat of vaporization when water vaporizes. Various techniques for cooling have been developed.

  For example, a technique relating to water-retaining pavement in which an artificial water pool is provided in the lower part of the pavement, the water stored in the water pool is evaporated, and latent heat of evaporation is used for cooling the pavement road surface is disclosed (see Patent Document 1). .

  The water-retaining pavement described in Patent Document 1 is formed by laying cut crushed stones on a road floor and laminating a plurality of layers of water-permeable asphalt on the top. And it has the structure where the nonwoven fabric which surrounds the bottom face and side face of a cut crushed stone with a waterproof sheet, and connects the layer of a cut crushed stone and the layer of water-permeable asphalt is arranged. In this water-retaining pavement, the portion surrounded by the waterproof sheet becomes a water pool, and water is stored during rainfall or watering. And the stored water rises by the capillary phenomenon of a nonwoven fabric, and it is supposed that a road surface can be cooled by the latent heat of vaporization.

  In addition, a technique relating to a wet pavement structure in which a water storage layer is provided on the entire lower surface of the road surface and the road surface is wetted by continuous water supply from the water storage layer is disclosed (see Patent Document 2).

  In the wet pavement structure described in Patent Document 2, a water-impervious sheet is laid on the roadbed, a crushed water reservoir is provided on the upper part of the water-impervious sheet, and the crushed water reservoir is wavy in its longitudinal section. A water-absorbing sheet is laid, and a horizontal water-absorbing sheet, a sand layer, and a water-permeable pavement are disposed on the top of the wavy water-absorbing sheet. In this wet pavement structure, the water stored in the crushed stone reservoir reaches the water-permeable pavement material through a water absorbing sheet or the like to keep the road surface moist, and the road surface can be cooled by latent heat of evaporation.

  Moreover, the technique regarding the water retention type pavement structure which kept the pavement surface moist without supplying water from the outside over a long period of time (refer patent document 3) is disclosed.

  The water-retaining pavement structure described in Patent Document 3 has a water-impervious layer laid on the roadbed, and a water reservoir layer made of a block-like water-repellent member and water made of a fiber material are provided on the upper part of the water-impervious layer. The structure includes a diffusion layer and a water retention layer made of a water-permeable water-retaining pavement, and a pumping member made of a fiber material that connects the water storage layer and the water diffusion layer. In this water-retaining pavement structure, water is supplied from the reservoir layer to the pavement material by capillary action to keep the pavement surface moist, and the road surface can be cooled by the latent heat of evaporation.

JP-A-8-85905 JP 2000-45206 A JP 2003-268712 A

  However, the above-described conventional technology has a water-impervious layer on the roadbed, so that there is a problem that a large amount of overflowing rainwater flows on the pavement surface when there is intensive rainfall. Moreover, since it has a complicated pavement structure composed of a plurality of layers, there is a problem that the construction is not only troublesome but also expensive.

  The present invention has been proposed in view of the above-described circumstances, and is capable of efficiently suppressing the temperature rise of the paving material while being a simple structure, and further capable of reducing the construction cost, and the temperature rise suppressing pavement structure. The purpose is to provide.

The temperature rise suppressing pavement structure of the present invention has the following features in order to achieve the above-described object.
That is, the temperature rise restraint pavement structure of the present invention relates to a temperature rise restraint pavement structure provided with a water-permeable block member and water supply means for supplying water to the block member. The said block member is provided with the road surface part and the leg part extended toward the downward direction from this road surface part. In addition, the water supply means stores the water that has permeated from the road surface portion, supplies the stored water to the leg portion, and permeates the road floor with water that exceeds the limit of the storage amount. . In the temperature rise suppression pavement structure having such a configuration, water is supplied from the water supply means to the legs. The water supplied to the legs rises to the road surface by capillary action, keeps the road surface moist, and cools the road by its latent heat of vaporization. Moreover, at the time of rain, rainwater reaches a water supply means through a leg part from a road surface part, and water is stored. At this time, the water overflowing beyond the limit of the storage amount in the water supply means penetrates into the road bed.

  In addition, the block member includes at least two legs, the lower ends of the legs are not communicated with each other, and an open space is formed between adjacent legs, and the water supply means has an upper surface open. The box-shaped member is configured such that water is stored in the box-shaped member, and the lower portion of each leg portion is accommodated to supply water to each leg portion. In the temperature rise-suppressing pavement structure having such a structure, water stored in the box-shaped member is supplied to the road surface portion via the legs by capillary action, keeps the road surface portion moist, and the road surface is caused by the latent heat of evaporation. Cooling. Further, when it rains, rainwater oozes out from the road surface portion through the legs into the box-shaped member and is stored. In this case, since the upper surface of the box-shaped member is open, excess water overflows from the upper surface of the box-shaped member and penetrates into the ground.

  Moreover, it is preferable that each said leg part has an enlarged diameter part in the lower end part. In the temperature rise suppressing pavement structure having such a configuration, the diameter-enlarged portion is in contact with the bottom surface of the box-shaped member, so that the stability of the block member can be improved. Moreover, since the contact area of the water stored in the box-shaped member and the leg portion increases, the pumping effect by capillary action can be enhanced.

  Moreover, it is preferable to arrange a heating means in the open space. This heating means can be constituted by, for example, a pipe that passes hot water or hot air, or a heating wire. In the temperature rise suppressing pavement structure having such a configuration, road surface freezing in winter can be prevented by heating the road surface by the heating means.

  Moreover, it is preferable to provide a sensor for detecting whether or not the water supply means stores water. In the temperature rise suppression pavement structure having such a configuration, water supply to the road surface can be prevented from being interrupted.

  According to the temperature rise suppressing pavement structure of the present invention, a water-permeable block member and water supply means are used as basic components, water is supplied from the water supply means to the legs, and the road surface is kept moist by capillary action. The road surface can be cooled by the latent heat of vaporization. Therefore, although it is a simple structure, the temperature rise of a paving material can be suppressed efficiently and construction cost can be reduced further.

  Moreover, at the time of rain, rainwater reaches the water supply means from the road surface portion through the legs, and water is stored in the water supply means. However, since there is no water shielding layer, excess water penetrates into the ground. Therefore, even when there is intensive rainfall, the phenomenon that a large amount of rainwater flows on the pavement surface can be minimized.

Hereinafter, with reference to drawings, the embodiment of the temperature rise control pavement structure of the present invention is described.
<First Embodiment>
1 to 4 relate to a temperature rise restraint pavement structure according to the first embodiment of the present invention, FIG. 1 is a front view of the temperature rise restraint pavement structure, FIG. 2 is a side view of the temperature rise restraint pavement structure, FIG. 3 is a plan view of the temperature rise suppressing pavement structure, and FIG. 4 is a perspective view of a box-shaped member used for the temperature rise suppressing pavement structure.

  The temperature rise suppressing pavement structure according to the first embodiment of the present invention constitutes the basic configuration of the present invention. That is, the temperature rise suppression pavement structure according to the first embodiment has a block member 10 and a box-like member 20 as a unit, and a plurality of these members are arranged adjacent to each other as shown in FIGS. By doing so, the road surface is formed on the road bed.

As shown in FIGS. 1 and 2, the block member 10 includes a road surface portion 11 and two leg portions 12 extending downward from the road surface portion 11. The lower end portions of the leg portions 12 do not communicate with each other, and an open space portion is formed between the adjacent leg portions 12. Further, an enlarged diameter portion 13 is provided at the lower end portion of the leg portion 12. This block member 10 has water permeability. Here, the water permeability of the block member 10 can sufficiently supply water from the leg portion 12 to the road surface portion 11 using capillary action, and rainwater that has fallen on the road surface passes through the leg portion 12. It is preferably 1.0 × 10 ⁻² cm / sec or more in that it can reach the box-shaped member 20 efficiently.

  The box-shaped member 20 is a member that functions as a water supply means for supplying water to the legs 12. As shown in FIG. 4, the box-shaped member 20 has an open upper surface, and the lower portion of the leg portion 12 is accommodated in the box-shaped member 20 from the open portion. The material of the box-shaped member 20 may be any material as long as it can store water. For example, plastic or the like can be used. In the first embodiment shown in FIGS. 1 to 3, the box-shaped member 20 is provided for each leg 12, but the box-shaped member 20 may be provided in common for the plurality of legs 12.

  In the temperature rise suppression pavement structure according to the first embodiment, the water stored in the box-shaped member 20 rises to the road surface portion 11 through the leg portion 12 by capillary action, keeps the road surface portion 11 moist, and evaporative latent heat. As a result, the road surface is cooled. Further, when it rains, rainwater reaches the box-shaped member 20 from the road surface portion 11 via the leg portion 12, and water is stored in the box-shaped member 20. In addition, since the upper surface of the box-shaped member 20 is open, excess water overflows from the upper surface of the box-shaped member 20 and penetrates into the ground. The phenomenon of rainwater flowing on the pavement surface can be minimized.

  Moreover, since the enlarged diameter part 13 is provided in the lower end part of the leg part 12, while improving the stability of the block member 10, a contact area with water can increase and the pumping effect can be heightened.

<Second Embodiment>
Next, with reference to FIG. 5, the temperature rise suppression pavement structure concerning the 2nd Embodiment of this invention is demonstrated. FIG. 5 is a front view of a temperature rise suppressing pavement structure according to the second embodiment of the present invention.

  The temperature rise suppressing pavement structure according to the second embodiment of the present invention is provided with a heating means for heating the road surface portion 11 in addition to the basic configuration of the present invention. That is, the temperature rise suppressing pavement structure according to the second embodiment of the present invention includes a pipe 30 through which hot water or hot air passes in an open space provided between adjacent leg portions 12 as shown in FIG. The arrangement is arranged.

Specifically, warm water or warm air is circulated in the pipe 30 to heat the road surface portion 11. In this case, if hot water or hot air is supplied using waste heat from a garbage disposal facility or a cogeneration system, resources can be effectively used to reduce the burden on the environment.
In addition, a heating member is not restricted to the pipe which distribute | circulates warm water or warm air, For example, a heating wire can also be used.

  According to the temperature rise suppressing pavement structure according to the second embodiment, the road surface can be heated by the heating means, so that road surface freezing in winter can be prevented.

<Third Embodiment>
Next, with reference to FIG. 6, the temperature rise suppression pavement structure which concerns on the 3rd Embodiment of this invention is demonstrated. FIG. 6 is a front view of a temperature rise suppressing pavement structure according to the third embodiment of the present invention.

  The temperature rise suppressing pavement structure according to the third embodiment of the present invention is provided with a sensor for detecting whether or not the water supply means stores water in addition to the basic configuration of the present invention. That is, the temperature rise suppression pavement structure according to the third embodiment of the present invention detects the temperature near the lower portion of the box-shaped member 20 and the first temperature sensor 41 that detects the outside air temperature, as shown in FIG. The second temperature sensor 42 is provided.

  When water is stored in the box-shaped member 20, the temperature detected by the second temperature sensor 42 is detected by the first temperature sensor 41 because the second temperature sensor 42 detects the temperature of the water. It becomes lower than the detected outside temperature. On the other hand, when water is not stored in the box-shaped member 20, both the first temperature sensor 41 and the second temperature sensor 42 detect the outside air temperature, so the detection results of both sensors are substantially the same. Become. Thereby, it is possible to detect whether or not water is stored in the box-shaped member 20.

  When it is detected that water is not stored in the box-shaped member 20, water may be supplied to the box-shaped member 20 by spraying water on the road surface.

  In addition, a sensor is not restricted to the thing of the structure mentioned above, For example, the optical water sensor arrange | positioned in the box-shaped member 20 can also be used.

  According to the temperature rise suppressing pavement structure according to the third embodiment, water supply to the road surface can be prevented from being interrupted, and the temperature rise of the pavement structure can be suppressed.

  Next, the experimental result using the temperature rise suppression pavement structure which concerns on embodiment of this invention is shown. FIG. 7 is a graph showing experimental results demonstrating the temperature rise suppression effect using the temperature rise suppression pavement structure according to the embodiment of the present invention. In this experiment, the road surface temperature (two places) of the temperature rise suppression pavement structure according to the embodiment of the present invention, the road surface temperature of the pavement structure for which no measures were taken, and the outside air temperature were measured.

  As apparent from FIG. 7, according to the temperature rise suppressing pavement structure according to the embodiment of the present invention, even when the road surface is exposed to solar radiation, the increase in the road surface temperature can be effectively suppressed. . In other words, when the road surface is exposed to solar radiation, the road surface temperature rapidly increases in the pavement structure without any countermeasures, but in the temperature rise suppression pavement structure according to the embodiment of the present invention, the temperature is equal to or slightly higher than the outside air temperature. It can be seen that the road surface temperature is changing and the road surface is effectively cooled by the latent heat of vaporization.

<Other embodiments>
The temperature rise suppressing pavement structure of the present invention is not limited to the configuration of the above-described embodiment, and can be implemented with various modifications.
For example, the water permeability of the block member, the shape of the road surface part, the volume of the box-like member, the size of each part, etc. are appropriately changed according to the weather conditions of the place where the pavement structure is constructed, the purpose of use of the pavement structure, etc. can do.

  A highly water-absorbing polymer material can also be used as a water supply means. In this case, water is transferred between the superabsorbent polymer material and the leg by accommodating the superabsorbent polymer material in the water-permeable bag and bringing the outer surface of the bag into close contact with the leg. Done. When using a highly water-absorbing polymer material as a water supply means, a water-permeable block having a general shape can be used. That is, as a block member having water permeability, a pair of plate-like portions are provided in parallel vertically and a water-permeable block having a shape in which the plate-like portions are connected by a plurality of legs is used, and the upper and lower plate-like portions are used. By inserting a bag body containing a highly water-absorbing polymer material into a space formed between the adjacent leg portions, a temperature rise suppressing pavement structure can be configured.

  Moreover, by forming an uneven pattern on the surface of the road surface portion, the surface area can be increased, the road surface portion can be efficiently cooled, and an anti-slip effect can be exhibited.

The front view of the temperature rise suppression pavement structure which concerns on the 1st Embodiment of this invention. The side view of the temperature rise suppression pavement structure which concerns on the 1st Embodiment of this invention. The top view of the temperature rise suppression pavement structure which concerns on the 1st Embodiment of this invention. The perspective view of the box-shaped member used for the temperature rise suppression pavement structure which concerns on the 1st Embodiment of this invention. The front view of the temperature rise suppression pavement structure which concerns on the 2nd Embodiment of this invention. The front view of the temperature rise suppression pavement structure concerning the 3rd Embodiment of this invention. The graph which shows the experimental result which demonstrated the temperature rise inhibitory effect using the temperature rise inhibitory pavement structure which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Block member 11 Road surface part 12 Leg part 13 Diameter expansion part 20 Box-shaped member 30 Pipe 41 1st temperature sensor 42 2nd temperature sensor

Claims (5)

A temperature rise suppressing pavement structure comprising a block member having water permeability and a water supply means for supplying water to the block member,
The block member includes a road surface portion and leg portions extending downward from the road surface portion,
The water supply means stores the water that has permeated from the road surface portion, supplies the stored water to the leg portion, and permeates the road floor with water that exceeds the limit of the storage amount, Suppressed pavement structure. The block member includes at least two legs, and the lower ends of the legs are not communicated with each other to form an open space between adjacent legs,
The water supply means is composed of a box-shaped member having an open upper surface, stores water in the box-shaped member, accommodates a lower portion of each leg, and supplies water to each leg. The temperature rise suppressing pavement structure according to claim 1, wherein   Each said leg part has an enlarged diameter part in the lower end part, The temperature rise suppression pavement structure of Claim 2 characterized by the above-mentioned.   The temperature rise suppressing pavement structure according to any one of claims 1 to 3, wherein heating means is disposed in the open space.   The temperature rise suppression pavement structure according to any one of claims 1 to 4, wherein a sensor for detecting whether or not the water supply means stores water is provided.

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