JP5006153B2 - Water retentive pavement unit, water retentive pavement system, and water retentive pavement forming method using water retentive pavement unit - Google Patents

Description

  The present invention relates to a water retention pavement unit laid on, for example, a sidewalk, a rooftop, or a park, a water retention pavement system including a plurality of water retention pavement units, and a method for forming a water retention pavement using the water retention pavement unit. It is.

  Urban sidewalks, building rooftops, or parts of parks are usually hardened with asphalt or concrete. During summer days when the temperature is high and the reflection is high, the temperature rise in such places is much more marked than in the surrounding area. In such an environment, walking on the sidewalk or spending time on the rooftop is very difficult. In recent years when the global warming phenomenon has become particularly prominent, this heat is dissipated from the asphalt and the rooftop of buildings not only during the daytime but also at nighttime, which is one of the factors that cause the so-called heat island phenomenon. .

To alleviate this heat island phenomenon, attempts have been made to plant trees on the side of the road, plant lawns and trees on the roof of buildings, or plant various flowers. Is required.
As a part of this, as in Patent Document 1, a container-shaped water retention tank is installed under the water retentive pavement block main body (hereinafter simply referred to as a water retentive block), and rainwater that has fallen in this water retention tank is stored. Attempts have been made to suck up the rainwater by capillarity through a nonwoven fabric when the outside is hot, evaporate the sucked rainwater from the water-retaining block, and cool the water-retaining block by its latent heat of vaporization.
In other words, rainwater is stored in a water retention tank when it rains, preventing rainwater from flowing into the river all at once. At high temperatures, the water retention block is cooled with the stored rainwater to contribute to alleviating the heat island phenomenon.

Japanese Patent No. 2885085 (Japanese Patent Laid-Open No. 8-85907)

  In the case of the water retention block disclosed in Patent Document 1, there is no problem as long as a passerby is walking on the water retention block. However, for example, when a car that loads luggage into a store beside a paved road or a car that enters or leaves a parking lot crosses this, the water retaining block could not withstand the weight of the car and could be damaged.

  In view of the above-described problems, the object of the present invention is to provide a water-retaining pavement unit, a water-retaining pavement system, and a water-retaining pavement using the same, even if a heavy object such as a car is placed thereon. It is to provide a method.

In order to achieve the above object, a water-retaining pavement unit according to claim 1 of the present invention includes a water storage bat having an opening in the upper part and a water-permeable cushion layer formed by laying a water-permeable cushion material in the water storage bat. And a water retentive block laid on the water permeable cushion layer, and the upper end of the side wall of the water storage bat includes:
It is characterized by being located higher than the upper surface of the water-retaining block spread on the water-permeable cushion layer.
According to the water retentive pavement unit according to claim 1, the water retentive block is laid on a water permeable cushion layer made of, for example, earth and sand. Even if temporarily placed, the entire lower surface of the water-retaining block is supported by a water-permeable cushion layer, so that the stress is relieved and it is much less likely to break than in the past.

The retentive pavement unit according to claim 1, wherein further, the side wall upper end of the front Symbol water vat is characterized in that in a position higher than the upper surface of the permeability of the cushion layer to spread was water retention block .
According to the water-retaining pavement unit according to claim 1 , the rain that has fallen on the water-retaining block is such that the upper end of the side wall of the water storage bat is higher than the upper surface of the water-retaining block. The water bat is blocked by the side wall of the water storage bat and accumulates without flowing away on the water retaining block.
Therefore, it is easy to allow rain that has fallen to pass through the water-retaining block, and water can be efficiently stored in the water-permeable cushion layer below the water-retaining block.

The retentive pavement units as reference examples, further water stored in the water before SL provided in the water storage vat the permeability of the cushion layer has a water guide member for pumping the water retention block.
The water retention paving unit ing as this, is provided with a water guide member. In this case, since there is water guide member into the water storage vat, the water supplied from the water-permeable cushion layer, pumping to more efficiently water retention block. Therefore, when the outside air temperature on the sidewalk becomes high, moisture can be efficiently supplied to the water retention block, and as a result, the moisture is evaporated from the surface of the water retention block and the water retention block is efficiently cooled by latent heat of vaporization. Is possible.

Further retentive pavement units described in Reference Example is characterized in that the projection is provided in the water-retentive pavement units, before Symbol water vat bottom.
According to the water-retaining pavement unit constructed in this manner, the protrusion on the bottom surface of the water storage bat adds vibration to the entire water storage bat, and the water permeable cushion layer made of earth and sand in the water storage bat tries to move by the vibration. However, this movement interferes with the protrusion as an obstacle. As a result, it is possible to reduce the possibility that the water-permeable cushion layer is biased in the water storage bat, and therefore the water retaining block is displaced or tilted.
Furthermore, if the height of the protrusion is increased so that the top end of the protrusion itself is brought into contact with the lower surface of the water retention block, the movement of the water retention block can also be suppressed, and a stronger positional displacement suppression effect can be exhibited. .

The retentive pavement unit according to the reference example, the water-retentive pavement unit, before Symbol projection is a column-shaped projections, it said column-shaped projection is an internal cavity, and columns in the column-like projection A water passage hole is provided for communicating the inside of the protrusion and the inside of the water storage bat.
Thus, according to the water retention paving unit ing and, if a plurality of water retention blocks within a single reservoir bat is spread, the presence of Suppose shadows (including shade) obstacles such as, Even if there is a difference in the amount of rainfall to each water-retaining block and there is a bias in the amount of rainwater or the like that permeates into the water-permeable cushion layer in the water storage bat, Water is diffused by the existing water passage holes, and the water distribution in the permeable cushion layer can be made more uniform. As a result, the amount of pumped water to a plurality of water retaining blocks can be averaged, and the amount of evaporation from each water retaining block can be further averaged.

Furthermore retentive pavement unit according to the reference example, the water-retentive pavement unit, before Symbol water passage hole, characterized in that is closed by Bosa mesh.
Thus, according to the water retention paving unit ing in the, or covered with a waterproof mesh individually with the water flow hole, covers the water passage holes in Bosa meshes such as to cover a plurality of water-passing holes simultaneously Bosa mesh It is blocking. Therefore, a cushion layer material forming a water-permeable cushion layer enters the row-shaped projections whose interior is hollow through this water passage hole, closes the cavity, disturbs the intrusion of water into the cavity, It can prevent effectively reducing the effect of the invention which makes the inside of a line-like projection and the inside of a water storage bat communicate.

The retentive pavement unit according to the reference example, before Symbol permeability of the cushion layer of the water-retentive pavement units quartz sand, sand, plastic beads, is characterized in that it is formed from at least one of glass beads.
Thus, according to the water retention paving unit ing in the silica sand the permeability of the cushion layer, sand, plastic beads, or glass beads, or since the formed water permeable cushion material comprising a combination thereof In addition, water such as rainwater can be stored efficiently.

Furthermore retentive pavement unit according to the reference example, the water-retentive pavement units, in the side wall of the front Symbol water vat, the drain hole or notch for drainage is provided by overflowing the are water storage vat water It is characterized by having.
According to the water-retaining pavement unit described in the reference example thus formed, the drainage holes or drainage notches are provided in the side walls of the water storage bat, so that rainwater accumulates excessively in the water-permeable cushion layer during heavy rain. Even in such a case, a part of the accumulated water can overflow from the drainage hole or drainage notch to the outside of the water storage bat. As a result, it is possible to prevent a problem that the water retention block is lifted.

The retentive pavement system according to claim 2 includes a water-retentive pavement unit according to claim 1 which is a plurality arranged in a plane, between the reservoir bat retentive pavement unit adjacent Of-holding aqueous paving unit It is a water retention pavement system characterized by having the water-passing means which was able to pass mutually provided.
According to the water-retaining pavement system according to claim 2, the water-permeable means that allows water to pass between the water-retaining bats of adjacent water-retaining pavement units is provided. Even when the amount of water stored in the cushion layer is different, it can be made uniform through this water passage means. Therefore, when the temperature on the water retention pavement unit rises, water can be evaporated more uniformly from the water retention block of each water retention pavement unit, and the water retention block can be efficiently cooled by the latent heat of evaporation. it can.

In addition, the water retentive pavement system according to claim 3 is the water retentive pavement system according to claim 2 , wherein at least one of the plurality of water retentive pavement units arranged in a plane is the water retentive pavement. The water storage bat of the unit is further provided with water supply means for supplying water from a water supply source.
According to the water-retaining pavement system according to claim 3, the water-retaining means is provided between the water-retaining bats of adjacent water-retaining pavement units. Since at least one water supply means for supplying water from a water supply source such as a water supply or a reservoir is further provided, for example, in a water-permeable cushion layer in any water-retaining pavement unit, the water storage amount is very small. Even if it is lost or lost, water is supplied from the water supply source to at least one water-retaining pavement unit through the water supply means, and water is supplied to other water-retaining pavement units through the supplied water-retaining pavement unit. Can be used to supply water. As a result, since water can be supplied to a plurality of water-retaining pavement units, the cooling capacity can be extracted in each water-retaining pavement unit.

Furthermore a method of forming the retentive pavement according to claim 4 or to form a cushion layer in road bed formed by digging the ground to a predetermined depth, retentive pavement unit according to claim 1 to said cushion layer The water storage bat is spread, and a water permeable cushion material is laid in each of the water storage bats to form a water permeable cushion layer. The water retentive block is formed on the water permeable cushion layer and the upper surface thereof is lower than the ground surface. It is characterized by laying down like this.
According to the water-retaining pavement forming method according to claim 4 thus constructed, since the water-retaining block is laid down so that the upper surface thereof is lower than the ground surface, the rain that has fallen on the water-retaining pavement unit Part of the water does not flow away but accumulates on the water-retaining pavement unit. Furthermore, it becomes easy to guide rainwater into the unit from the sidewalk side outside the water-retaining pavement unit. As a result, the accumulated rainwater penetrates the water retention block over time and accumulates in the water permeable cushion layer below the water retention block. That is, rainwater can be efficiently guided to the water-permeable cushion layer.

Moreover, since the formation method of the water retention pavement of Claim 4 uses the unit of the water retention pavement of Claim 1, the upper surface of the said water retention block is lower than the upper end of the side wall of the said water storage bat. It is laid down in position.
According to the method of forming the water retention pavement ing in the not only the upper surface of the water retention block below the ground surface, by laying a position lower than the upper end of the side wall of the said reservoir vat, dam sidewall upper end Thus, a part of the rain can be reliably collected on the water-retaining pavement unit. As a result, it is possible to collect rain more efficiently and reliably in the water-permeable cushion layer below the water retention block.

Furthermore, the water-retaining pavement forming method according to claim 5 is the water-retaining pavement forming method according to claim 4 , wherein there are a plurality of the water storage bats and water is passed between adjacent water storage bats. It is characterized in that possible water flow means are provided.
According to the method for forming a water-retaining pavement according to claim 5, the water-permeable means that allows water to pass between adjacent water storage bats is provided. Even when the amount of stored water in the layers is different, it can be made uniform through this water flow means. Therefore, when the temperature on the water retention pavement unit rises, water can be evaporated more uniformly from the water retention block of each water retention pavement unit, and the water retention block can be efficiently cooled by the latent heat of evaporation. it can.

The water-retaining pavement forming method according to claim 6 is the water-retaining pavement forming method according to claim 4 , wherein there are a plurality of the water storage bats and water is passed between adjacent water storage bats. Possible water passage means is provided, and water supply means for supplying water to at least one of the water storage bats is further provided.
According to the method for forming a water-retaining pavement according to claim 6, the water-passing means capable of passing water between adjacent water-storage bats is provided, and at least one of the water-storage bats is provided. Since water supply means for supplying water is further provided, for example, even if the water storage amount becomes very small or disappears in any of the water-permeable cushion layers in any water-retaining pavement unit, a separate water supply is provided. Water is supplied to at least one water-retaining pavement unit through a water supply means from a water source, specifically a fountain, a reservoir, a water tank, or a water supply, and another water-retaining pavement is supplied through this supplied water-retaining pavement unit. The unit can be supplied with water by means of water. As a result, since water can be supplied to a plurality of water-retaining pavement units, the cooling capacity can be extracted in each water-retaining pavement unit. Here, the water supply source is not limited to a fountain, a reservoir, or a water tank, but any water source may be used.

  As described above, according to the present invention, even when a heavy object such as a car is placed on the water-retaining block, the water-retaining pavement unit, the water-retaining pavement system, and the method for forming the water-retaining pavement using the same Can provide excellent effects.

Embodiments of a water-retaining pavement unit, a water-retaining pavement system, and a method for forming a water-retaining pavement using these water-retaining pavement units will be described in detail below with reference to the drawings.
FIG. 1 is a schematic sectional view showing an example in which the water-retaining pavement unit of the present invention is laid on a sidewalk. As shown in FIG. 1, first, the ground is dug to a predetermined depth, and this is leveled and solidified to prepare the road bed 1. The cushion layer 2 is formed by spreading sand and crushed stone on the roadbed 1 so as to facilitate the uneven work when the water storage bats 3 to be described later are spread.

Next, a plurality of water storage bats 3 are laid flat on the cushion layer 2. At this time, the gap between the adjacent water storage bats 3 and the gap between the water storage bats 3 and the dug holes are also filled with the material forming the cushion layer 2.
Here, the water storage bat 3 shown in FIG. 1 has a planar shape, for example, a rectangle or a square, and has a box shape with an upper portion opened. The material is usually made of a resin such as polypropylene, or a metal laminate for preventing corrosion, a combination of a panel board and a water shielding sheet, or a metal subjected to corrosion prevention treatment. Or made of concrete. Various materials can be used as long as they have the same mechanical strength and durability as those materials. It is more preferable if it is suitable for cost.
In the case of a resin, it is preferable to form with a recycled polypropylene resin because it can be manufactured at low cost. Incidentally, the size of the water storage bat 3 is, for example, about 3 m × 3 m. However, it is not limited to this size, and it may be selected each time depending on surrounding conditions such as the size of the laying ground.

Subsequently, as a reference example, a case where at least one water guide member 4 is erected in the water storage bat 3 will be described . In the case where the water storage bat 3 is large, for example, a plurality of water guiding members 4 may be erected at predetermined intervals as shown in FIG .
Incidentally, the water-conducting member 4 is made of a porous body obtained by forming silica or the like into a columnar shape or a cylindrical shape, or a non-woven fabric or the like processed into a band shape or a pipe shape, or a synthetic resin cylindrical body with silica sand. It is made of a material filled with sand-like material with a small particle size. This synthetic resin cylindrical body may be either flexible or non-flexible, but the flexible one is easier to use because it allows for some length variation.
When the water-conducting member 4 is erected at a predetermined position as described above, one kind of material selected from materials such as silica sand, earth and sand, plastic beads, and glass beads, or a material made by mixing several kinds in the water storage bat 3 To form a water-permeable cushion layer 5 having a predetermined thickness. The height of the water-permeable cushion layer 5 is such that when the water-retaining block 6 is laid flat on the water-permeable cushion layer 5, the upper surface of the water-retaining block 6 is located on the ground surface 10 and further from the upper end 7 of the side wall of the water storage bat 3. Also make the height slightly lower.

The reason is that rainwater is collected on the water retention block 6 using the upper portion of the side wall of the water storage bat 3 or the ground surface 10 as a weir. Otherwise, the rain will flow instantaneously from above the water retaining block 6 toward the lowland, and the water retaining block 6 cannot be permeated and sufficient rainwater cannot be stored in the water permeable cushion layer 5 below. It is.
When the water-permeable cushion layer 5 is formed as described above, a plurality of water-retaining blocks 6 are spread on the surface. At this time, as described above, the water retaining block 6 is laid with care so that the upper surface of the water retaining block 6 is positioned lower than the upper end 7 of the side wall of the water storage bat 3 and the ground surface 10.
Here, the size of the water retention block 6 is usually 300 mm × 150 mm, but it is needless to say that other sizes can be used for the water retention block 6.
As described above, the water-retaining pavement unit 11 of the present invention includes the water storage bat 3, the water-permeable cushion layer 5 filled in the water-storage bat 3 with a predetermined height, and the water-permeable cushion layer. 5 and a water-retaining block 6 laid on top. Alternatively, it is formed by adding a water-conducting member 4 erected in the water storage bat 3.

  In this way, the water-retaining pavement unit 11 of the present invention is spread in a flat shape where the ground under the sidewalk is dug to a predetermined depth. According to the water retentive pavement unit 11 thus configured, even if a heavy object such as a vehicle is placed on the water retentive block 6 of the water retentive pavement unit 11, the water permeable cushion layer 5 is formed under the water retentive block 6. Exists. Therefore, this cushion layer 5 absorbs and relaxes a part of the stress generated by the weight of the car or the like. As a result, the water retaining block 6 can be prevented from being damaged as compared with the conventional case.

Moreover, when laying the water-retaining pavement unit 11, as described above, since the upper surface of the water-retaining block 6 is laid down to be lower than the ground surface 10 and the side wall upper end 7 of the water storage bat 3, It can be surely stored on the water retention block 6. Furthermore, it becomes easy to guide rainwater onto the water-retaining block 6 also from the sidewalk side outside the water-retaining pavement unit 11. As a result, the accumulated rainwater can penetrate into the water-retaining block 6 and can be efficiently stored in the lower water-permeable cushion layer 5.
If the laying surface of the water-retaining pavement unit 11 is almost horizontal and it is difficult for rainfall to flow all at once, the upper surface of the water-retaining block 6 and the surface 10 or the upper end 7 of the side wall 7 of the water storage bat 3 are made substantially equal. Needless to say. In addition, if the upper end 7 of the side wall of the water storage bat 3 is higher than the upper surface of the water retention block 6, the upper surface of the water retention block 6 and the ground surface 10 or the water storage bat in a place that may interfere with the entry of pedestrians or vehicles. 3 side wall upper ends 7 are made substantially equal. How to do it may be decided in consideration of the conditions of the laying place.

FIG. 2 is a partially enlarged view of the laying end of the water storage bat 3 shown in FIG. As shown in FIG. 2, the upper surface of the water retaining block 6 is laid down by a height D lower than the ground surface 10 and the side wall tip 7 of the water storage bat 3. This D is preferably 2 mm to 8 mm.
In the case where a plurality of water storage bats 3 are arranged side by side in the width direction of the sidewalk, if the side wall tip 7 of the water storage bat 3 protrudes on the sidewalk, it will interfere with the walking of the pedestrian. Therefore, the step D is formed only at both ends in the width direction of the sidewalk, and the inside of the sidewalk is laid so that the height of the side wall tip 7 of the water storage bat 3 is equal to the upper surface of the water retention block 6. In other words, in such a case, only the side wall on the shoulder side may be higher than the remaining three side walls by D. In order to make the step D inconspicuous, a slope may be formed by applying mortar from the side wall tip 7 of the water storage bat 3 to the surface of the water retention block 6 so that the step D is inconspicuous.

As a reference example, a case where a drainage hole 13 connected to the outside of the water storage bat 3 is formed in the upper portion of the side wall of the water storage bat 3 is shown . Incidentally, the drain hole 13 may be provided between the middle of the side wall of the water storage bat 3 and a position slightly below the lower surface of the water retention block 6.
If the drainage hole 13 is provided in this way, when rainwater accumulates in the water-permeable cushion layer 5 due to heavy rain enough to overflow the water storage bat 3, the water overflows from the drainage hole 13 and escapes into the ground. It is possible to prevent the water retaining block 6 from floating. By the way, what is shown by reference in FIG. 2 is a drainage hole 13, in place of the drain hole 13, or a notch that cut from the side wall upper end 7 of the water vat 3, optionally in the drainage hole 13 Draining may be performed by connecting a pipe and connecting the tip of the pipe to a rain gutter, a manhole, a side gutter of a sidewalk, or the like, or to sink into the ground.

FIG. 3 shows another reference example of the water storage bat 3 in the water-retaining pavement unit 11 of the present invention, and the upper part is a plan view and the lower part is an XX cross-sectional view in the plan view. In FIG. 3, reference numeral 15 denotes independent protrusions provided on the bottom surface of the water storage bat 3. In this example, only four protrusions are provided. The number may be determined according to the size of the bottom surface of the water storage bat 3. Furthermore, the arrangement may be arbitrary, for example, a staggered arrangement may be used. Further, the shape is not limited to the truncated quadrangular pyramid, and may be other shapes such as a hemispherical shape. In FIG. 3, reference numeral 13 is the same as the drain hole 13 shown in FIG.

Thus, if the convex protrusion standing up from the bottom face of the water storage bat 3 is provided, vibration will be added to the whole water storage bat 3, and the water-permeable cushion layer 5 which consists of earth and sand etc. in the water storage bat 3 will be provided. Even if it tries to move due to the vibration, the independent protrusion 15 is obstructed by this movement. As a result, it is possible to reduce the possibility that the water-permeable cushion layer 5 is biased to one side of the water storage bat 3 in the water storage bat 3, and thus the water retention block 6 is displaced, lifted or inclined.
Further, if the height of the protrusion 15 is increased so that the top end of the protrusion 15 is brought into contact with the lower surface of the water-retaining block 6, the movement of the water-retaining block 6 due to vibration can be more effectively suppressed, and the stronger The effect of preventing misalignment can be exhibited. Furthermore, since the water retaining block 6 is supported from below, an effect of preventing the water retaining block 6 from being bent when a heavy object is placed on the water retaining block 6 can be expected.

FIG. 4 shows another reference example of the water storage bat 3 in the water-retaining pavement unit 11 of the present invention. As in FIG. 3, the upper part is a plan view and the lower part is an XX cross-sectional view in the plan view. The protrusion shown in FIG. 4 is a protrusion having a shape different from the protrusion shown in FIG. 3, specifically, a row-like protrusion 17 straddling opposite sides on the bottom surface of the water storage bat 3. Even in such row-like projections 17, when the water-retaining pavement unit 11 is shaken, the row-like projections 17 obstruct the movement of the water-permeable cushion layer 5 in the water storage bat 3, which is effective for preventing the movement. is there. In addition, you may form this row | line | column protrusion 17 in other shapes, such as a grid | lattice form.

  In FIG. 4, the inside of the row projections 17 is hollow. The hollow columnar protrusions 17 are formed with a plurality of water passage holes 18 communicating with the inside. In this way, if a plurality of water passage holes 18 are formed in the row-shaped projections 17 having a hollow inside, it is assumed that there is an obstacle such as a shade (including a tree shade) and the amount of rainfall to each water retaining block. Even if there is a difference and the amount of rainwater or the like penetrating into the water-permeable cushion layer 5 in the water storage bat 3 is biased, the water is projected into the row projections 18 by the water passage holes 18 formed in the row projections 17. 17 enters the interior of the water storage bat 3 and is diffused over a wide area in the water storage bat 3 so that the water storage distribution in the permeable cushion layer 5 can be made more uniform. As a result, the amount of water pumped by the water-conducting member 4 to the plurality of water retaining blocks 6 is also averaged, and the amount of evaporation from each water retaining block 6 can be made more uniform. Here, also in FIG. 4, the code | symbol 13 has shown the drainage hole as mentioned above.

  By the way, if the internal structure of the row-like protrusions 17 shown in FIG. Accordingly, a trapezoidal trapezoidal cross-sectional shape is prepared in advance, and thereafter, the opening side is faced downward and is attached to the bottom surface of the water storage bat 3 with an adhesive or the like, or both the bottom surface and the row-shaped protrusions 17 are adhered. You may make it fix by providing the fitting part which consists of a fitting hole or a fitting protrusion fitted to this, and fitting both.

FIG. 5 shows a reference example of the water retention pavement system of the present invention, and is a partially enlarged sectional view showing the relationship between adjacent water storage bats 3. FIG. 5 is characterized in that, in the lower part of the side surfaces of the water storage bats 3 of the adjacent water-retaining pavement units 11, there are provided water passage means 20 that communicate with each other and allow water to pass through each other. Specifically, for example, as one of the methods, a hole is formed in each side wall, and a pipe is hung over the hole.
In this way, even when the water storage amount in the water-permeable cushion layer 5 between the adjacent water storage bats 3 is different, the water storage means 20 can be made uniform. Therefore, when the temperature on the water retentive pavement unit 11 rises, the water can be evaporated more uniformly from the water retentive block 6 of each water retentive pavement unit 11, and the water retentive block 6 is cooled by the latent heat of evaporation. can do.
In addition, as shown in FIG. 5, in this example, the adjacent part of the water storage bats 3 is located inside the sidewalk, so that the water storage bat 3 has a lower end on the side wall so as not to disturb the pedestrian's walk. The height is the same as the surface of the block 6.

FIG. 6 is a plan view showing a reference example of another water retention pavement system of the present invention. 6 is characterized in that it has a circular shape, whereas the shape of the water-retaining pavement unit shown so far is a quadrilateral. Generally this kind of thing is laid in the park.
The water-retaining pavement unit 11 used here has a shape obtained by dividing a circle into quarters and is omitted in the drawing, but the water storage bats 3 of each water-retaining pavement unit 11 are shown in FIG. As shown, they are connected by water passing means 20. And at least one of the four water-retaining pavement units 11 has a water conduit drawn from the nearest fountain, etc. If the water storage capacity of the water-permeable cushion layer 5 is reduced, the fountain Water is supplied from the side through a water conduit or the like (water supply means). Here, the water supply means includes, for example, a pump, a valve, a filter, a water supply pipe, and the like, but the valve can be replaced with an electromagnetic valve or the like. Of course, the water supply means may have any other structure as long as it can perform the water supply function.

In this way, for example, even if the amount of water stored in the water-permeable cushion layer 5 in any water-retaining pavement unit 11 becomes very small or disappears, via this water supply means, for example, Water is supplied to at least one water-retaining pavement unit 11 from another water source such as a fountain, and water is passed through the supplied water-retaining pavement unit 11 to the other water-retaining pavement unit 11 by the water supply means 20. Can do. As a result, since water can be supplied to the plurality of water-retaining pavement units 11, the cooling capacity of each water-retaining pavement unit 11 can be maximized. As the water supply source of the water supply means, the fountain, the reservoir, the water tank, or the water supply described above can be used.
The water-retaining pavement unit 11 shown in FIG. 6 has a shape in which a circle is divided into ¼, and these four water-retaining pavement units 11 are combined to form a water-retaining pavement system having a circular planar shape. However, it may be formed by one water-retaining pavement unit 11 having a circular shape from the beginning. In short, in view of the laying place and the like, it is only necessary to decide which one to consider in consideration of the transportability of the water-retaining pavement unit 11 and the ease of laying work.

In the reference example of FIG. 4, each water hole 18 is in contact with the water permeable cushion layer 5, so that a cushioning material such as earth and sand enters from the side of the water permeable cushion layer 5 to close the water hole 18. There is also a risk of entering the cavity and closing the inside. Therefore, a sandproof mesh having a mesh size smaller than the particle diameter of the cushion material forming the water permeable cushion layer 5, for example, the water passage holes 18 are individually closed with a sandproof mesh larger than the holes of the water passage holes 18, It is preferable to prevent the cushion material from entering the interior of the water passage hole 18 by covering the entire projection 17 with a sheet-like sandproof mesh and covering the whole water passage hole 18 at once.
If it does in this way, the cushion material which forms the water-permeable cushion layer 5 will enter into the line-shaped projection 17 whose inside is hollow through this water passage hole 18, and will block the water passage hole 18 and the cavity, The risk of disturbing the intrusion of water into the cavity can be reduced.

  Also, as shown in FIGS. 1 and 2, moisture such as rainwater penetrating the water-retaining block 6 is efficiently guided into the water-permeable cushion layer 5, or conversely, when the outside is hot, this water-permeable The water-conducting member 4 is provided in the water-permeable cushion layer 5 for the purpose of efficiently pumping rainwater or the like stored in the cushion layer 5 toward the water-retaining block 6 and promoting evaporation from the water-retaining block 6. However, when the particle size of the cushion material forming the water-permeable cushion layer 5 is small, the capillary phenomenon tends to work. Therefore, when the particle size of the water-permeable cushion layer 5 is small, the water-conducting member 4 can be eliminated.

  As described above, according to the present invention, even when a heavy object such as a car is placed on the water-retaining block, the water-retaining pavement unit, the water-retaining pavement system, and the formation of the water-retaining pavement using the same. A method can be provided.

It is a schematic sectional drawing which shows one Example of the water retention pavement using the water retention pavement unit of this invention. It is a partially expanded sectional view which shows the edge part of the water retention pavement in FIG. The other example of the water-retaining pavement unit of a reference example is shown, the upper stage is a plan view of a water storage bat, and the lower stage is an XX cross-sectional view thereof. The further another Example of the water-retaining pavement unit of a reference example is shown, The upper stage is a top view of a water storage bat, and the lower stage is the XX sectional drawing. It is a partially expanded sectional view which shows one Example of the water retention pavement system of a reference example . It is a top view which shows the Example of another water-retaining pavement system of a reference example .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Subgrade 2 Cushion layer 3 Water storage bat 4 Water-permeable member 5 Water-permeable cushion layer 6 Water retention block 7 Side wall upper end 10 of the water storage bat Surface 11 Water retention pavement unit 13 Drain hole 15 Protrusion 17 Row-shaped protrusion 18 Water passage hole 20 Water flow means

Claims (6)

A water storage bat having an opening at the top, a water permeable cushion layer formed by spreading a water permeable cushion material in the water storage bat, and a water retention block laid on the water permeable cushion layer ,
Furthermore, the upper end of the side wall of the water storage bat is
Than the upper surface of the water-retaining block spread on the water-permeable cushion layer,
A water-retaining pavement unit characterized by being in a high position. 2. The water retention pavement unit according to claim 1, wherein a plurality of the water retention pavement units are arranged in a plane, and a water passage means provided between water storage bats of adjacent water retention pavement units among the water retention pavement units. Water-retaining pavement system. In at least one of the plurality of water-retaining pavement units arranged in a plane , water supply means for supplying water from a water supply source to the water storage bat of the water-retaining pavement unit is further provided. Item 3. A water-retaining pavement system according to item 2 . A cushion layer is formed on a road bed formed by digging the ground to a predetermined depth, and a water storage bat of the water-retaining pavement unit according to claim 1 is laid on the cushion layer, and a water-permeable cushion is provided in each of the water storage bats. A method for forming a water-retaining pavement, characterized in that a water-permeable cushion layer is formed by spreading a material, and a water-retaining block is spread on the water-permeable cushion layer so that the upper surface is lower than the ground surface. 5. The method for forming a water-retaining pavement according to claim 4, wherein a plurality of the water storage bats are provided, and water passing means capable of passing water between adjacent water storage bats is provided. A plurality of the water storage bats are provided, water passing means capable of passing water between adjacent water storage bats is provided, and water supply means for supplying water to at least one of the water storage bats is further provided. The method for forming a water-retaining pavement according to claim 4 .

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