JP2008274603A - Pavement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pavement structure wide in room for selecting a material, and superior in maintainability. <P>SOLUTION: This pavement structure 1 has mainly a pavement body layer 2 being a surface layer and a water supply device 3. The pavement body layer 2 is a layer positioned on the outermost ground surface side, and, for example, is formed by laying pavement blocks 20 having water retentivity all over in a plurality. The pavement body layer 2 has a slit opening on a pavement surface 2a. In this embodiment, a joint 25 of the mutual pavement blocks 20 functions as the slit. A water supply tape 31 is a water supply means for supplying water to the pavement body layer 2, and is buried in the joint 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pavement structure having a water supply function for suppressing a temperature increase of the pavement.

In recent years, the so-called “heat island phenomenon” in which the temperature in urban areas is higher than that in the surrounding area has become a problem. One of the causes is the heat storage effect of asphalt pavement, and a pavement structure having a water supply function is being developed to suppress the heat storage (temperature rise) of asphalt pavement.
For example, Patent Document 1 discloses a pavement system that automatically supplies water from a water supply pipe (irrigation pipe) embedded in a lower part of a pavement block and suppresses the temperature rise of the pavement block by heat of vaporization.
Further, Patent Document 2 discloses a water-retaining pavement structure that has a water retention layer on the pavement surface side and a water supply layer below the pavement surface and can supply water from a water supply pipe embedded in the water supply layer. .
JP 2006-161343 A JP 2004-353399 A

However, in the pavement structure with the conventional water supply function, since the water supply pipe is embedded in the lower part of the pavement, it is necessary to use a pavement material with excellent ability to soak up water, leaving room for material selection. It was limited.
Moreover, in the pavement structure provided with the conventional water supply function, when an abnormality occurred in the water supply pipe, it was necessary to perform maintenance by peeling off the upper pavement. For this reason, there is a problem that maintenance takes time and cost.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a pavement structure with a wide room for material selection and excellent maintainability.

  The pavement structure according to the present invention includes a pavement layer having a slit that opens on a pavement surface, and water supply means installed in the slit.

  According to such a configuration, since the water supply means is installed in the slit provided in the pavement layer, the distance between the water supply means and the pavement layer is short. For this reason, a material having a lower ability to soak water than before can be used, so that the range of material selection is widened.

  Moreover, since the water supply means is installed in the slit opened on the pavement surface, the water supply means can be maintained from the opening. Therefore, it is not necessary to peel off the pavement layer at the time of maintenance of the water supply means, and maintenance labor and cost can be reduced.

The water supply means of the present invention preferably includes any one of a water supply tape, a water supply pipe, and a groove-shaped member having an open top, or a combination thereof.
According to such a configuration, water can be suitably distributed in the slit.

  Here, “water supply tape” means that when water is not flowing inside, the cross-sectional shape is elongated and crushed, that is, a tape-like shape, and water flows inside without any restrictions Is a member having a circular cross-sectional shape.

The pavement layer of the present invention is composed of a plurality of pavement blocks, and the slit is preferably a joint portion between the pavement blocks.
According to such a configuration, joints between a plurality of paving blocks can be used as slits, so that the formation of slits and the installation of water supply means are easy.

The pavement layer of the present invention preferably has water retention.
According to such a configuration, since the pavement layer has water retention, water supplied from the water supply means in the slit is retained in the pavement layer. Therefore, the cooling action can be maintained for a long time.

  ADVANTAGE OF THE INVENTION According to this invention, the room for material selection is wide and the pavement structure excellent in maintainability can be provided.

  The best mode for carrying out the present invention will be described in detail with reference to the drawings. In this embodiment, the case where a pavement block is used as a pavement layer will be described as an example. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a plan view of a pavement structure according to the present embodiment. FIG. 2 is a cross-sectional view of the pavement structure according to the present embodiment.
As shown in FIGS. 1 and 2, the pavement structure 1 according to the present embodiment constitutes a so-called road, and mainly includes a pavement layer 2 as a surface layer and a water supply device 3. The pavement structure 1 has a layered structure, and includes a pavement layer 2, a support layer 4, a water shielding layer 5, and a roadbed 6 in order from the pavement surface (see FIG. 2). The application target of the pavement structure 1 may be not only a sidewalk and a roadway, but also a promenade, a plaza, a parking lot, a building periphery, a rooftop, and the like.

  The pavement layer 2 is a layer positioned on the most ground surface side, and is formed, for example, by laying a plurality of pavement blocks 20 having water retention. The pavement layer 2 has a slit that opens in the pavement surface 2a. In this embodiment, the joint 25 between the paving blocks 20 functions as a slit.

  As shown in FIG. 1, the pavement block 20 is a member that receives a stepping pressure from an automobile, a pedestrian, or the like, and is configured by, for example, a flat plate block having a rectangular parallelepiped shape. For example, the pavement blocks 20 are arranged in parallel along the extending direction of the road, and are arranged alternately (staggered) in the width direction of the road. A joint 25 is formed between the adjacent pavement blocks 20. The joint 25 is filled with sand 27 so that the pavement block 20 does not move (see FIG. 2). And the water supply tape 31 of the water supply apparatus 3 is embed | buried under a part of the joint 25 parallel to the extension direction of a road.

  As shown in FIG. 2, the pavement block 20 includes, for example, a plurality of aggregates 21 and a water retention grout 23 filled in a gap between the aggregates 21. The aggregate 21, the material, the particle size, the coarse particle ratio, the open particle size, and the like are selected and adjusted so that the desired strength can be exhibited. The water retention grout 23 is a grout material having water retention, for example, an ordinary grout material composed of cement and water is configured to contain a mineral or resin having water retention. The water retention grout 23 mainly retains water supplied from the water supply tape 31 or rain water that has rained on the pavement surface 2a. The paving block 20 can be appropriately selected from known paving blocks.

As shown in FIG. 2, the support layer 4 is a layer that supports the pavement layer 2 from below, and is composed of, for example, sand (fine aggregate) having a predetermined particle diameter.
The water shielding layer 5 is provided between the support layer 4 and the roadbed 6 and prevents water from flowing out from the support layer 4 to the roadbed 6. The water shielding layer 5 is composed of, for example, a water shielding sheet. In addition, the water | moisture content which cannot be water-retained by the pavement body layer 2 and the support layer 4 will flow on the water shielding layer 5 along a gradient, and will be drained.
The roadbed 6 is a layer that plays a role of distributing the load from the support layer 4 to the roadbed (not shown).

  As shown in FIG. 1, the water supply device 3 mainly includes a water supply tape 31 that is a water supply means, a water storage tank 32, and a connection pipe 33 that connects them.

  The water supply tape 31 is a water supply means for supplying water to the pavement layer 2, and is embedded in the joint 25 (see FIG. 2). The water supply tape 31 is arranged along the road extending direction with a predetermined interval in the road width direction. A connecting pipe 33 is connected to each water supply tape 31, and water is supplied from the water storage tank 32 via the connecting pipe 33.

FIG. 3 is a perspective view showing the water supply means, where (a) shows a water supply tape and (b) shows a water supply pipe.
When water is not flowing inside, the water supply tape 31 has a shape in which the cross-sectional shape is crushed and slender as shown in FIG. 3A, that is, a tape-like shape. Is a member having a circular cross-sectional shape when flowing. In this embodiment, as shown in FIG. 2, since the water supply tape 31 is installed in the narrow joint 25, it does not become a complete circular shape even when water flows, and the cross-sectional shape is somewhat elongated. Water flows in a crushed state.

As shown to Fig.3 (a), the water supply tape 31 is a resin-made hollow member, and water flows through the hollow part 31a. The water supply tape 31 is hollow, for example, by laminating _one edge 31c and the other edge 31d of one elongated plate-like member and welding the lower end 31d1 of the other edge 31d which is the outside. It is formed in a shape. The water supply tape 31 has a slit (slot) -shaped groove 31b penetrating the other edge 31d on the outer side in the vicinity of the center in the width direction of the portion where the one edge 31c and the other edge 31d overlap each other. is doing. The slit-shaped grooves 31 b are connected to, for example, a decompression device described later, and are formed at intervals of several tens of centimeters in the longitudinal direction of the water supply tape 31. The shape of the slit-shaped groove 31b is not particularly limited, and may be formed in any shape.

  On the inner peripheral surface of the hollow portion 31a (for example, the outer surface of one edge portion 31c) between the slit-shaped grooves 31b, for example, a plurality of ridges (devices that become resistance when water flows) are formed. The pressure reducing device reduces the water pressure of water supplied by a pump described later. The water flowing through the hollow portion 31b enters between the one edge portion 31c and the other edge portion 31b, and after being decompressed by the decompression device, is discharged outside from the slit-shaped groove 31b. Therefore, a fixed amount of water can be discharged from each slit-like groove 31b regardless of the distance from the pump.

In addition, the water supply means of this embodiment is not restricted to the water supply tape 31, For example, as shown in FIG.3 (b), you may use the water supply pipe 131 which exhibits a circular cross section.
The water supply pipe 131 has a hollow portion 131a through which water flows, and a plurality of through holes 131b that connect the hollow portion 131a and the outer peripheral portion. The through holes 131b are formed, for example, in a circular shape, and two through holes 131b are provided at a predetermined interval. The water supply pipe 131 is formed of a flexible material (for example, rubber), and even when the diameter is larger than the joint 25 of the pavement layer 2, it can be installed in the joint 25 by being deformed into an elongated ellipse. It has become.

  As shown in FIG. 1, the water storage tank 32 is a tank that stores water to be supplied to the water supply tape 31, and can store rainwater, for example. A connecting pipe 33 is connected to the water storage tank 32.

  The connection pipe 33 is a pipe that connects the water supply tape 31 and the water storage tank 32, and is buried below the pavement layer 2 along the crossing direction of the road. For example, the connecting pipe 33 is made of a vinyl chloride pipe having a diameter larger than that of the water supply tape 31 so as not to be blocked. Although the connection pipe 33 is embedded below the pavement layer 2, its extension is short, so that even if maintenance is necessary, the range where the pavement layer 2 is peeled can be minimized.

  In addition, although illustration is abbreviate | omitted, the water supply apparatus 3 is a sensor which measures the amount of solar radiation, a pump which sends the water in the water storage tank 32 to the water supply tape 31, a control apparatus which controls a pump based on the signal from a sensor, and It also has a power supply. As the power supply device, for example, a solar power generation device or the like is preferably used.

FIG. 4 is a perspective view showing another water supply pipe. FIG. 5 is a view showing a modification of the water supply means.
In the present embodiment, the water supply tape 31 is used as the water supply means. However, as shown in FIG. 4, for example, a resin water supply pipe 31 </ b> A having a circular cross section may be installed. The water supply pipe 31A has a circular cross section regardless of the presence or absence of water flow in the hollow portion 31Aa, and has a plurality of through holes 31Ab. Sand 27 is filled around the water supply pipe 31A.
As shown to Fig.5 (a), 31 A of water supply pipes are installed in the joint 25 of the pavement body layer 2 with the circular cross section.

  Moreover, as shown in FIG.5 (b), it replaces with the water supply tape 31, and you may install the groove-shaped member 31B which the upper part opened. In such a case, the water overflowed from the upper opening of the channel member 31B is supplied to the pavement layer 2. Therefore, water can be supplied above the pavement layer 2. The groove-shaped member 31B may be made of metal, for example, or may be formed by bending a water shielding sheet into a groove shape. Further, the inside of the channel member 31B may be filled with sand.

  Moreover, as shown in FIG.5 (c), you may install the water supply tape 31 in the groove-shaped member 31B. If it does in this way, it will become difficult for the water supplied from the water supply tape 31 to flow out to the support layer 4, and water can be supplied to the pavement layer 2 effectively.

It continues and demonstrates the effect | action of the pavement structure 1 which concerns on this embodiment.
According to the pavement structure 1 according to the present embodiment, the water supplied from the water supply tape 31 is sucked up by the water retention grout 23 of the pavement block 20 and rises to the pavement surface 2a. And in the process where the water which rose to the pavement surface 2a turns into water vapor | steam, the heat of the pavement body layer 2 is taken as heat of vaporization, and the temperature rise of the pavement body layer 2 will be suppressed.

  At this time, since the water supply tape 31 is installed in the joint 25 which is a slit of the pavement layer 2, the pavement layer 2 only needs to suck up water from the joint 25. Therefore, compared to the conventional pavement structure sucked up from the support layer 4, the distance to be sucked is shortened, and it becomes possible to use a material having low water absorption. It is also possible to use a material having low water absorption for the support layer 4. Therefore, the range of material selection for the pavement layer 2 and the support layer 4 is expanded. Moreover, since a high water absorption is not required, even if the water absorption of the pavement layer 2 is lowered due to deterioration over time, a high temperature reduction effect can be exhibited.

  Further, when maintenance (for example, replacement) of the water supply tape 31 becomes necessary for some reason, the water supply tape 31 can be taken out from between the joints 25 to perform maintenance. Therefore, there is almost no need to peel off the pavement layer 2, and maintenance is easy.

  Here, when replacing the water supply tape 31, first, the water supply tape 31 in the joint 25 is grasped and pulled up to take out the water supply tape 31 from the joint 25. At this time, most of the sand 27 filled in the joint 25 is discharged out of the joint 25 together with the water supply tape 31. In addition, in order to make it easy to put the new water supply tape 31 in the joint 25, you may exclude the sand 27 in the joint 25 using an air blowing apparatus. Further, when the water supply tape 31 is gripped, for example, only one pavement block 20 may be removed.

And the water supply tape 31 is replaced | exchanged, the new water supply tape 31 is installed in the original joint 25, and the sand 27 is filled. Thereby, the maintenance of the water supply tape 31 can be performed without removing the pavement block 20 almost.
In addition, by taking out the water supply tape 31 from the joint 25 and storing it in the winter when no heat island countermeasure is required, it is possible to easily prevent the water supply tape 31 from being deteriorated. Thereby, the service life of the water supply tape 31 can be extended.

  As mentioned above, although the best embodiment for implementing this invention was described in detail with reference to drawings, this invention is not limited to these embodiment, In the range which does not deviate from the main point of invention, it is appropriate. It goes without saying that changes are possible.

  For example, in the present embodiment, the pavement layer 2 is configured by spreading a plurality of pavement blocks 20, but the configuration of the pavement layer 2 is not limited to this. For example, the pavement layer 2 may be a water-retaining asphalt pavement, and more specifically, a normal asphalt pavement or a concrete pavement that does not have water retentivity. In this case, the water supply tape 31 etc. can be installed in the said slit by forming a slit in a pavement using an asphalt cutter. Moreover, a slit may be formed by embedding a thin plate or the like when the pavement is placed and removing the thin plate after curing.

  Moreover, in this embodiment, although the water supply tape 31 was installed in parallel with the extension direction of a road, the installation direction of the water supply tape 31 is not specifically limited, For example, a water supply pipe is equally spaced in the direction orthogonal to a road May be installed.

It is a top view of the pavement structure concerning this embodiment. It is sectional drawing of the pavement structure which concerns on this embodiment. It is a perspective view which shows a water supply means, (a) shows a water supply tape, (b) has shown the water supply pipe, respectively. It is a perspective view of another water supply pipe. It is drawing which shows the modification of a water supply means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pavement structure 2 Pavement body layer 2a Pavement surface 3 Water supply apparatus 4 Support layer 5 Water shielding layer 6 Roadbed 20 Pavement block 21 Aggregate 23 Water retention grout 25 Joint 27 Sand 31 Water supply tape (water supply means)

Claims (4)

  A pavement structure comprising: a pavement layer having a slit that opens on a pavement surface; and water supply means installed in the slit.   The pavement structure according to claim 1, wherein the water supply means includes any one of a water supply tape, a water supply pipe, and a groove-shaped member having an upper opening, or a combination thereof.   The pavement structure according to claim 1 or 2, wherein the pavement layer is composed of a plurality of pavement blocks, and the slit is a joint portion between the pavement blocks.   The pavement structure according to any one of claims 1 to 3, wherein the pavement layer has water retention.

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