JPH11100803A - Wet pavement system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a temperature rise of the ground surface by connecting a water-permeable pavement material and water storage tanks with a water guide member. SOLUTION: A prescribed member 2 made of a water-permeable material having no capillary water guiding force at the time of a rainfall is installed on the roadbed 1 of a pavement, or a prescribed member 2 made of a waterproof sheet is installed on the artificial ground or a roof floor. A nonwoven fabric 4 is installed on the prescribed member 2, and a sand cushion 5 is installed on the nonwoven fabric 4. Pavement blocks 3 are spread on the sand cushion 5. U-shaped ditches are formed on both sides of a road surface as water storage tanks 6, and covers 7 made of a water-permeable raw material are provided at the portions opened on the ground surface of the water storage tanks 6. The water of the water storage tanks 6 is sucked up by the nonwoven fabric 4 at the time of fine weather and is guided to the pavement blocks 3 through the sand cushion 5 to set the road surface to the wet state. A temperature rise of the ground surface can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet permeable pavement system having a function of making a pavement surface wet in a permeable pavement, preventing the pavement surface from drying, and suppressing a rise in surface temperature.

[0002]

2. Description of the Related Art In recent years, in view of the adverse effects of impermeable pavement,
Permeable pavement is being promoted to promote the penetration of rainwater and the communication of air to foster street trees, reduce the burden on sewers, prevent flooding of urban rivers, and recharge groundwater.

However, in this water-permeable pavement, since the water retention of the pavement material typified by the water-permeable asphalt and the water-permeable pavement block is extremely small, the absorbed rainwater immediately becomes dry with a short period of solar radiation, The surface temperature rises. In other words, after rainfall, rainwater penetrates into the ground, but since the moisture is not retained near the pavement surface, the pavement surface tends to dry quickly, and because there is no evaporative function like soil and vegetation, After drying, the thermal properties remain the same as non-permeable pavement, and the high temperature of the pavement in summer causes discomfort to the people, which in winter contributes to drying of the city.

[0004] Therefore, in the water-permeable pavement, a water retaining portion is provided below or below the pavement structure to prevent the pavement surface from drying, and to utilize the latent heat generated when water accumulated in the water retention portion evaporates from the pavement surface. A technique for suppressing a rise in temperature of a pavement surface is disclosed. For example, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 8-85907 a water-retentive pavement block in which a water-retention tank is provided below each pavement block, and water stored in the water-retention tank penetrates the block through a nonwoven fabric. . In addition, when a water-retaining member is provided between the block material covering the ground surface and the roadbed, or on a water-permeable asphalt pavement, a large number of aggregates made of water-retaining ceramic are spread on the roadbed to form a water-retaining layer. There were things that did.

[0005]

However, in the above-mentioned conventional permeable pavement having a water retaining portion, since the water retaining portion is buried in the pavement structure, the water stored in the water retaining portion is paved. When it is depleted by evaporation from the surface,
The wet state of the pavement surface is not maintained, and the effect of suppressing the temperature rise on the ground surface is lost. In particular, if the weather continues for a long time in the summer and becomes drought, this situation becomes remarkable. Therefore, it was necessary to water and supply water to the road surface in a timely manner.

[0006] In addition, processing individual pavement blocks involves problems such as high cost and labor. Also, using a new material such as ceramic as the water-retaining member or performing various processes on the water-retaining member also has a problem in construction, such as an increase in cost. In fact, water-retentive ceramic products have higher material costs than secondary concrete products,
The fact is that it is used only in very limited places.

Accordingly, the present invention has been made in view of such a conventional problem, and it is possible to suppress a rise in the temperature of the ground surface by keeping the pavement surface in a wet state, and furthermore, only a water retention function is provided. It is another object of the present invention to provide a wet pavement system having a water supply function capable of supplying water at a low operation cost.

[0008]

In order to achieve the above object, a wet pavement system according to the present invention is a wet pavement system capable of holding a pavement surface in a wet state. A water-permeable pavement material having a function, a water storage tank that is opened or openable on the ground surface, and a water-guiding member that connects the water-storage tank and the water-permeable pavement material so as to be able to conduct water. .

Here, it is desirable that a water permeable material or a waterproof sheet is laid below the water guide member.

Preferably, a pavement block is used as the water-permeable pavement material, and the water guide member is provided at a lower portion or joint of the pavement block and extends to the water storage tank.

It is preferable that a rainwater storage tank and a water supply mechanism for supplying water from the rainwater storage tank to the water storage tank be provided.

In addition, it is desirable to provide a pipe or a porous pipe between the water-permeable pavement and the water-guiding member or with a hole for water diffusion embedded in the water-permeable pavement.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 shows a schematic sectional view of the wet pavement system of the present invention.

A predetermined member 2 is laid on a roadbed 1 serving as a paved surface, and a nonwoven fabric 4 serving as a water guide member is laid on the predetermined member 2. As will be described later, the predetermined member 2 is made of a material having no capillary water-conducting power that is permeable in rain in the case of a pavement or the like, and a waterproof sheet is used in the case of an artificial ground or a rooftop. A sand cushion (cushion sand) 5 is laid on the nonwoven fabric 4, and a paving block 3 is laid on the sand cushion 5 as a paving member so as to form a road surface. This road surface becomes a wet-paved road surface.

On both sides of the road surface, U-shaped grooves are formed as side grooves, and this becomes a water storage tank 6. The nonwoven fabric 4 is laid horizontally across the pavement section on the predetermined member 2,
Extends to the bottom inside. A lid 7 is attached to a portion of the water storage tank 6 which is open to the ground surface. Lid 7
Surface water flowing on the road surface through the reservoir 6
The lid 7 is desirably made of a water-permeable material so that the water flows into the cover 7.

In the underground pit of the building 10 near the water storage tank 6, a rainwater storage tank 9 is provided.
The rain that has fallen on the rooftop flows into the rainwater storage tank 9 through a water pipe 11 attached to the side wall. The rainwater stored in the rainwater storage tank 9 is supplied to the water storage tank 6 through the water guide pipe 8 in a timely manner.

The rainwater storage tank 9 may be installed not only on the first floor of the building 10 or outdoors, but also along the outside of the water storage tank 6 by forming a single groove as the rainwater storage tank 9. Good. Further, as a water supply mechanism for supplying water from the rainwater storage tank 9 to the water storage tank 6, a natural fall or a pump is used depending on a height difference between the two tanks. Alternatively, a nonwoven fabric is attached so as to connect the two tanks, and the capillary water guide action of the nonwoven fabric causes the rainwater storage tank 9 to move from the water storage tank 6 to the water storage tank 6.
It is good also as supplying rainwater. Furthermore, a configuration in which rainwater is supplied to the rainwater storage tank 9 from a rainwater storage tank different from the rainwater storage tank 9 may be employed.

FIG. 2 is a view showing that a pavement structure is different depending on a place to which the wet pavement system of the present invention is applied. (A) is a pavement sectional view when applied to a pavement or the like, and (b) is a pavement sectional view when applied to an artificial ground or a rooftop.

In a pavement or the like, a crushed stone layer 12 is formed on a ground 13, on which a material 2a having no capillary water-conducting power that is permeable during rainfall is laid. A nonwoven fabric 4 is laid on the material 2a, a sand cushion 5 is further laid thereon, and a pavement block 3 is laid thereon to form a road surface.

Here, as the material 2a, a material having no capillary water-conducting power such that water is guided only to the sand cushion 5 above the nonwoven fabric 4 during operation and water does not move to the lower crushed stone layer 12 and the ground 13 during operation. Used. Specifically, a mesh-like or mesh-like rubber sheet is used. During rainfall, surplus water is passed through this material 2a and the crushed stone layer 12, ground 13
To permeate and help recharge groundwater.

On the other hand, in the case of an artificial ground or a rooftop, the waterproof sheet 2b, the nonwoven fabric 4, and the pavement block 3 are laid in this order on the slab 14, and the pavement block 3 forms a pavement surface.

The pavement block 3 is a water-permeable pavement material having a water-absorbing function, for example, when applied to a pavement or the like, or to an artificial ground or a rooftop. Use a brick with fine eyes.

FIG. 3 is a diagram schematically showing a state of movement of water flowing on a pavement section.

FIG. 3A shows the flow of water in fine weather. The fibers of the nonwoven fabric 4 draw up the water accumulated in the water storage tank 6 by the capillary water guide force, and the pavement block 3 is passed through the sand cushion 5. To water. Then, the road surface is brought into a wet state by the capillary water guide force of the pavement block 3 itself.
If the nonwoven fabric 4 is provided at the joint of the pavement block 3,
Water is guided toward the pavement block 3 from the side. Water tank 6
The water inside is guided to the surface of the pavement block 3 even if the water level is below the road surface. Therefore, the pavement surface is always moistened as long as the water supply is not interrupted, and the water retained on the surface is evaporated by the solar radiation. At this time, the temperature of the pavement surface can be significantly reduced by the latent heat of evaporation. When there is no need to supply water to the road surface, the water tank 6
, The nonwoven fabric 4 plays the role of drainage, and the road surface can be kept dry.

FIG. 2 (b) shows the flow of water during rainfall. The rain that has fallen on the road surface penetrates the pavement block 3 and permeates the roadbed through the material 2a having no capillary water guide power. The surplus water flows into the water tank 6 as surface water on the road surface. Then, the nonwoven fabric 4 moves rainwater to the water storage tank 6. Therefore, there are three rainwater movement modes: pavement surface → roadbed, pavement surface → water tank, non-woven fabric → water tank.

(C) Instead of conducting water through the non-woven fabric 4 from the lower part or the side of the pavement block 3, FIG.
A model in which a pipe or a porous pipe 15 having a hole for water diffusion is buried in the upper sand cushion 5 and water is diffused in a horizontal direction through the sand cushion 5 and the nonwoven fabric 4 thereunder. FIG. In this case, a suitable number of pipes or porous pipes 15 are buried at appropriate intervals, and the water flowing through the pipes 15 is configured to diffuse in the pavement cross section in the horizontal direction. Moisture can be supplied evenly in a relatively short time, and the pavement block 3 absorbs the water to keep the road surface in a wet state.

When water-permeable asphalt is used as the water-permeable pavement material, for example, a waterproof sheet is laid on a lower roadbed, a nonwoven fabric is laid thereon, and an upper roadbed is formed on the upper part. The modified asphalt is constructed in a laminated state, and the base layer and the middle layer are further constructed in a laminated state with the water-permeable high-viscosity modified asphalt,
Finally, the pavement is completed by applying the water-permeable high-viscosity modified asphalt constituting the surface layer, and the wet pavement system of the present invention can be applied.

The wet pavement system of the present invention
The present invention is not limited to the above embodiments, and various embodiments can be adopted within the scope of the configuration described in each claim.

For example, various water guide members can be used in place of the nonwoven fabric 4. That is, materials such as a woven fabric made of natural fibers or chemical fibers, a single superabsorbent polymer, a sheet-like cloth containing a superabsorbent polymer, and a porous chemical resin can be used.

The nonwoven fabric 4 laid under the pavement block 3 may be closely laid over the entire surface of the predetermined member 2, or may be sparsely laid in a mesh structure or a crosslinked structure. May be laid so as to be connected.

Further, when the wet pavement system of the present invention is applied to a rather large place such as an event venue instead of a road, the water storage tank 6 may be constructed in a grid pattern or may be provided for each area having a predetermined area. A container-like water storage tank buried underground as a spot is provided, and a nonwoven fabric is laid so that water is radially guided toward the pavement surface from there.

In addition, a sensor may be provided in the water storage tank 6 to supply water from the rainwater storage tank 9 to the water storage tank 6 by using a water supply pump when the amount of water is reduced. Further, in the case where the sunny day continues and both the water storage tank 6 and the rainwater storage tank 9 have dried up, the water storage tank 6 may be forcibly supplied with water by using water supply or medium water.

[0033]

As explained in detail above, according to the wet pavement system of the present invention, the surface of the pavement is kept moist, so that the wet state of the pavement surface is maintained. Therefore, if this wet pavement system is adopted in places where people gather, such as sidewalks, open vacant lots, parks, event venues, leisure land, etc., it is possible to reduce the reflection and radiant heat from the pavement surface, suppress the temperature rise on the ground surface, and It does not cause any discomfort. For example, even when the temperature is close to 60 ° C. on a normal dry pavement surface in summer, the temperature of the ground surface can be suppressed to about 30 ° C. by applying the wet pavement system of the present invention. In addition, since the configuration is relatively simple, application to an artificial ground or a building roof is also easy.

Further, since there is no need to spray water on the road surface,
There is no need for sprinklers or other watering equipment, and no wasted water is used. In addition, operating costs can be reduced by effectively utilizing rainwater and snowmelt water and supplying it to the water storage tank. Further, since the water storage tank is opened or can be opened to the surface of the ground, maintenance such as cleaning is easy, and the amount of stored water can be actually checked visually.

In addition to this, the condition of the pavement surface can be controlled by monitoring and appropriately adjusting the amount and temperature of water in the water storage tank by providing various sensors. In other words, during the rainy season, the amount of water in the water tank should be set low, and on summer days when there is a strong glare, it should be set large, and in winter, hot water such as hot spring water can be used to prevent the road surface from freezing. In the summer, extremely useful effects can be obtained, such as using cold water such as well water to enhance the effect of suppressing the rise in the temperature of the ground surface.

The water storage tank and the rainwater storage tank can also be used as fire water. Further, when the wet pavement system is not used, for example, in order to prevent the road surface from freezing in a cold region, and when the road surface is not brought into a wet state, by opening the water storage tank, a water guide member represented by a nonwoven fabric is used. Performs a drainage function, and can make the road surface dry.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a wet pavement system according to an embodiment of the present invention.

FIG. 2 is a view showing that a pavement structure is different depending on a place where the wet pavement system is applied.

FIG. 3 is a diagram schematically showing a state of movement of water flowing through a pavement section in the wet pavement system according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paved surface 2 Predetermined member 2a Material which permeates at the time of rain (water permeable material) 2b Waterproof sheet 3 Pavement block 4 Nonwoven fabric 5 Sand cushion 6 Water storage tank 7 Lid (permeable lid) 8 Water guide pipe 9 Rainwater storage tank

Claims (6)

[Claims] 1. A wet pavement system capable of holding a pavement surface in a wet state, comprising: a water-permeable pavement material forming a pavement surface and having a water-absorbing function; and a water tank opened or openable on the ground surface. And a water guiding member that connects the water storage tank and the permeable pavement so as to be able to conduct water. 2. The wet pavement system according to claim 1, wherein a water permeable material is laid under the water guiding member. 3. The wet pavement system according to claim 1, wherein a waterproof sheet is laid under the water guide member. 4. A pavement block is used as the permeable pavement material, and the water guide member is provided at a lower portion or joint of the pavement block and extends to the water storage tank. Item 4. The wet pavement system according to any one of Items 1 to 3. 5. The wet pavement system according to claim 1, further comprising a rainwater storage tank, and a water supply mechanism for supplying water from the rainwater storage tank to the water storage tank. 6. A pipe having a hole for water diffusion or a porous pipe embedded between the water-permeable pavement material and the water-guiding member or embedded in the water-permeable pavement material. The wet pavement system according to any one of claims 1 to 5.