JP4157650B2 - Sidewalk pavement structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sidewalk pavement structure, and more particularly to a sidewalk pavement structure having a function of storing rainwater that has fallen on a road surface below a surface layer part.
[0002]
[Prior art and problems to be solved by the invention]
When rainwater falls on the pavement of road sidewalks (including bicycle roads and promenades where heavy vehicles do not pass), drainage facilities such as side grooves are generally installed on the side of the sidewalks. A method is adopted in which rainwater flows in and drains outside the sidewalk. In addition, the sidewalk is not subjected to heavy repeated loading by heavy vehicles, and therefore the roadbed and roadbed are not required to have high support and durability. In some cases, a water-permeable pavement that is allowed to permeate the roadbed and return to the ground is used.
[0003]
On the other hand, rainwater is a useful natural resource, and it is desirable to actively utilize it. However, if such rainwater is directly removed from the water distribution facility or penetrated into the ground, cleaning of the sidewalks and vegetation will occur. When using it for the surrounding environment, it was necessary to pump it up from the deep underground as groundwater, or to feed it from a storage facility in the distance, and rainwater could not be used efficiently.
[0004]
The present invention was made in view of such conventional problems, and provides a sidewalk pavement structure that allows rainwater falling on the pavement surface to be stored below the surface layer part and used efficiently. Objective.
[0005]
It is another object of the present invention to provide a sidewalk pavement structure that can form a ground surface space that has a good influence on the inhabiting of vegetation, insects, microorganisms, and the like, and that gives peace to pedestrians.
[0006]
[Means for Solving the Problems]
The present invention is a sidewalk pavement structure having a function of storing rainwater that has fallen on a pavement surface below a surface layer part, and a water-impervious sheet is recessed between the roadbed part and the roadbed part or in the roadbed part. Laying and filling the concave part of the water-impervious sheet with the granular material so that the aggregate porosity is 30% or more, the modified CBR has a strength of 30 or more and a water permeability coefficient of 1 × 10 ^-1 cm / sec or more. A roadbed portion comprising a water-impervious sheet is formed into a concave portion, and a sandflow prevention material such as a nonwoven fabric is laid on the surface of the roadbed portion, and a cushion material made of sand or the like is laid on the surface of the cushion material. It is configured by laying out water permeable blocks having a water permeability coefficient of 1 × 10 ⁻² cm / sec or more to form a surface layer portion, and rainwater that passes through the surface layer portion and permeates downward is formed into a concave portion by the water shielding sheet. rainwater by roadbed section granular material is formed by filling By providing a pavement section pavement structure, characterized by storing the Tomeso it is obtained by achieving the above object (the invention according to claim 1).
[0007]
Moreover, the sidewalk pavement structure of the present invention extends the water-impervious sheet that forms the concave portion to a height position close to the surface layer portion, and the rainwater level in the concave portion reaches the vicinity of the surface layer portion. It is preferable to form a high-water-level rainwater storage tank capable of ascending (the invention according to claim 2).
[0008]
Furthermore, the sidewalk portion pavement structure of the present invention is provided with a belt-like opening in the surface layer portion above the high-water-level rainwater storage tank, and a bottom plate located below the water level of rainwater stored below the belt-like opening. It is preferable that an open water channel into which rainwater flows in the high water level rainwater storage tank is formed by the bottom plate portion and the belt-like opening .
[0009]
Furthermore, the sidewalk pavement structure of the present invention is provided with a plurality of the high water level rainwater storage tanks spaced in the longitudinal direction of the sidewalk part, and the open water channel connects the adjacent high water level rainwater storage tanks to each other. According to the longitudinal gradient of the sidewalk, the rainwater stored from the upstream high water level rainwater storage tank toward the downstream high water level rainwater storage tank may be allowed to flow naturally through the open water channel. it (the invention of claim 4).
[0010]
In the above description, the hydraulic conductivity is measured by a test method specified in JIS A1218. The corrected CBR is measured by a test method defined in KODAN A1211.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sidewalk portion pavement structure 10 in the general storage tank portion (see FIG. 4) of the present embodiment is employed when forming a sidewalk portion 12 provided along the roadway portion 11 of the main road, for example, as shown in FIG. It is a thing. The roadway portion 11 is a so-called drainage pavement, and rainwater that has fallen on the roadway portion 11 is partially allowed to flow under the sidewalk portion 12 through the pavement portion 13, and the sidewalk portion is formed by a known rainwater drainage facility. 12 can be excluded outside.
[0012]
As shown in FIGS. 1 and 2, the sidewalk pavement structure 10 of the present embodiment makes the water-impervious sheet 15 concave along the road floor surface 14 formed by excavating the original ground into a concave shape and leveling. Laying and filling the concave portion by the water-impervious sheet 15 with the granular material 16, the roadbed portion 17 having a modified CBR with a strength of 30 or more and a water permeability of 1 × 10 ⁻¹ cm / sec or more is formed. A nonwoven fabric 18 is laid on the surface of the roadbed portion 17 as a sand flow prevention material, and a sand cushion 19 made of coarse sand is laid. The surface of the sand cushion 19 has a water permeability of 1 × 10 ⁻² cm / sec or more. The water permeable blocks 20 are arranged to form the surface layer portion 27. According to the sidewalk pavement structure 10, the roadbed portion 17 is formed by filling the concave portion formed by the water-impervious sheet 15 with the granular material 16 so that the aggregate porosity is 30% or more. A rainwater storage tank 21 capable of storing a large amount of rainwater is formed by the porosity.
[0013]
Here, the roadbed portion forming the roadbed surface 14 can be formed by laying a roadbed material (for example, sand) having a predetermined thickness (for example, about 5 cm) on the bottom surface of excavation. Is suitable for the roadbed material, the excavation ground can be used as a roadbed part, and the roadbed part 17 can be directly formed above the excavated ground.
[0014]
The water-impervious sheet 15 is, for example, a known sheet for civil engineering with a thickness of about 1.5 mm, and it is preferable to use a sheet having excellent durability and economy. The inside of the water-impervious sheet 15 laid in a concave shape is filled with the granular material 16 to form the roadbed part 17, so that the water-impervious sheet 15 is interposed between the roadbed part and the roadbed part 17. .
[0015]
According to this embodiment, as the granular material 16 forming the roadbed portion 17, an industry made of recycled aggregate mixed with solidified recycled aggregate (polynite) manufactured from sludge or resin-based industrial waste (such as vinyl chloride). Waste granular material is used. The particle size of this industrial waste granular material is adjusted so that the aggregate porosity after filling and compaction is about 40%, and the roadbed portion 17 formed using this is made of granular material such as crusher run. The modified CBR, which is equivalent in strength to a general pedestrian board, has a strength of 30 or more and a water permeability coefficient of 1 × 10 ^-1 cm / sec or more. In addition, according to this embodiment, the roadbed part 17 is formed by the thickness of about 30-80 cm.
[0016]
The nonwoven fabric 18 laid on the surface of the roadbed portion 17 prevents the coarse sand constituting the sand cushion 19 from flowing down into the roadbed portion 17 with the inflow of rainwater from the pavement portion 13. A highly durable nonwoven fabric 18 having a unit volume weight of about 300 g / m ² is laid on the upper surface of the roadbed portion 17 and used.
[0017]
The sand cushion 19 serves to facilitate the laying work of the water permeable blocks 20 constituting the surface layer portion 27 and to distribute the upper load applied to the water permeable blocks 20 and transmit it to the roadbed portion 17. The coarse sand is used so that it does not easily pass through the nonwoven fabric 18 and is laid on the upper surface of the roadbed portion 17 with a thickness of about 3 mm, for example.
[0018]
The surface layer portion 21 provided on the upper surface of the sand cushion 19 has a water permeability coefficient of 1 × 10 ⁻² cm / sec or more and a large number of rectangular water permeable blocks 20 having a bending strength of 4 N / mm ² or more arranged vertically and horizontally, about 6 cm. The thickness is formed. The water permeable block 20 is formed using a reinforcing admixture material such as a polymer while mixing 300 to 500 kg / m ² of ceramic waste, and has a porosity of about 20%.
[0019]
In addition, according to this embodiment, the water-impervious sheet 15 is laid on the side of the roadway part 11 to a height substantially equal to the upper end surface of the roadbed layer 29 of the roadway part 11 and paved the roadway part 11 having drainage. A portion of the rainwater that has fallen on the roadway portion 11 can flow into the rainwater storage tank 21 from the portion 13, and on the side opposite to the roadway portion 11, the single-side permeation side groove 22 installed on the opposite side Rainwater that has been laid to a height substantially equal to the height of the upper end and overflowed from the rainwater storage tank 21 can be excluded outside the rainwater storage tank 21 through this single-side infiltration side groove 22.
[0020]
In addition, a band-like opening 24 is formed in the upper central part of the sidewalk part pavement structure 10 in the extending direction of the sidewalk part 12, and a bottom board part 26 is provided below the side wall part 25 via a side wall part 25. As will be described later, an open water channel 23 is provided to connect adjacent high water level rainwater storage tanks 31 to each other.
[0021]
According to the present embodiment, rainwater that has fallen on the surface layer portion 27 constituting the pavement surface penetrates the roadbed portion 17 due to the water permeability of the surface layer portion 27 and is stored in the rainwater storage tank 21. The rainwater stored in the rainwater storage tank 21 is appropriately taken out as needed, for example, in fine weather, and supplied to a greening facility (slope, vegetation, greening soundproof wall, etc.), as road cleaning water, disaster prevention water, etc. It is possible to use efficiently for the environment. Moreover, since rainwater is stored under the road surface of the sidewalk part 12, it becomes possible to evaporate the stored water in fine weather, suppress heat island formation by the heat of vaporization, and bring thermal circulation closer to a natural state.
[0022]
Furthermore, according to the present embodiment, by using an industrial waste granular material as the granular material 16 forming the roadbed portion 17, the disposal cost spent on the industrial waste is reduced and contributes to social benefits. In addition, the use of ceramic waste, which is industrial waste, as a constituent material of the water permeable block 20 further contributes to social benefits.
[0023]
FIG. 3 shows a sidewalk pavement structure 30 in a high water level storage tank part (see FIG. 4) according to another embodiment of the present invention. According to this sidewalk part pavement structure 30, the sidewalk in the general storage tank part is shown. The water-impervious sheet 15 laid along the concave roadbed surface 14 extends to a height position close to the surface layer portion 27 by the water-permeable block 20. In this way, the high water level rainwater storage tank 31 that can raise the water level of the rainwater stored inside the water shielding sheet 15 to the vicinity of the surface layer portion 27 is formed.
[0024]
Further, the surface layer portion 27 above the high water level rainwater storage tank 31 extends from the end portion of each high water level rainwater storage tank 31 to the end portion of the adjacent high water level rainwater storage tank 31, and the sidewalk portion in the general storage tank portion. An open water channel 23 that connects adjacent upstream and downstream high-water-level rainwater storage tanks 31 to each other is provided so as to cut the upper part of the pavement structure 10 vertically. That is, the open water channel 23 is a bottom plate made of a strip-shaped opening 24 provided in the surface layer portion 19 along the longitudinal direction and a concrete board or the like disposed directly below the strip-shaped opening 24 via a side wall portion 25 made of concrete, for example. The bottom plate portion 26 is located below the rainwater level in the high water level rainwater storage tank 31.
[0025]
Therefore, as shown in FIG. 4, the open water channel 23 connects the high-water level rainwater storage tanks 31 alternately provided with the rainwater storage tanks 21 of the general storage tank part at intervals in the longitudinal direction of the sidewalk part 12. According to the longitudinal gradient of the sidewalk portion 12, the stored rainwater is allowed to flow naturally from the upstream high water level rainwater storage tank 31 toward the downstream high water level rainwater storage tank 31 via the open water channel. The open channel 23 is lined with natural stones and is in a state close to a natural stream.
[0026]
The rainwater stored in this way is guided by the open water channel 23, so that the rainwater is repeatedly sent to the downstream side while being purified between gravels, and has a good influence on the vegetation, insects, microorganisms, etc. A messiness that gives pedestrians peace is created.
[0027]
Note that the present invention is not limited to the above embodiment, and various modifications can be made. For example, it is not always necessary to provide an open water channel, and the granular material constituting the roadbed portion does not necessarily need to be an industrial waste granular material. Moreover, the adjacent roadway part does not necessarily need to be drainage pavement. Further, a sidewalk pavement structure can be provided alone as a promenade without being adjacent to the roadway. Furthermore, it is not always necessary to provide the water-impervious sheet at the boundary between the roadbed portion and the roadbed portion, and the rainwater storage tank can be formed by being embedded in the roadbed portion in a concave shape.
[0028]
【The invention's effect】
According to the sidewalk portion pavement structure of the present invention, rainwater that has fallen on the pavement surface is stored below the surface layer portion, and is appropriately taken out and used as needed. ), And can be efficiently used for the surrounding environment as road cleaning water and disaster prevention water, and the water can be evaporated in fine weather to suppress the heat island phenomenon by the heat of vaporization. Is possible. In addition, for example, by providing an open water channel, it is possible to form a ground surface space that has a good influence on the inhabiting of vegetation, insects, microorganisms, and the like, and gives peace to pedestrians.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along line AA in the general storage tank portion of FIG. 4, showing a sidewalk pavement structure according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing an enlarged configuration of a sidewalk pavement structure according to an embodiment of the present invention.
3 is a cross-sectional view taken along the line BB in the high water level storage tank part of FIG. 4 showing a sidewalk part pavement structure according to another embodiment of the present invention.
FIG. 4 is a plan view showing the arrangement of open water channels.
[Explanation of symbols]
10, 30 Sidewalk part pavement structure 11 Roadway part 12 Sidewalk part 13 Pavement part in roadway part 14 Road floor 15 Water-impervious sheet 16 Granular material 17 Roadbed part 18 Non-woven fabric (sand flow prevention material)
DESCRIPTION OF SYMBOLS 19 Sand cushion 20 Permeable block 21 Rainwater storage tank 23 Open water channel 24 Band-shaped opening 26 Bottom board part 27 Surface layer part 31 High water level rainwater storage tank

Claims (4)

A pavement structure with a function of storing rainwater that has fallen on the pavement surface below the surface layer part, and a water shielding sheet is laid in a concave shape between the roadbed part and the roadbed part or in the roadbed part, A roadbed with a modified CBR having a strength of 30 or more and a water permeability of 1 × 10 ^-1 cm / sec or more, while filling the concave portion of the water-impervious sheet with a granular material so that the aggregate porosity is 30% or more. A concave portion is formed by the water-impervious sheet, a sand flow prevention material such as a nonwoven fabric is laid on the surface of the roadbed portion, and a cushion material made of sand or the like is laid. × 10 ^-2 cm / sec or more is formed by laying a water permeable block side by side to form a surface layer portion, and the rainwater that passes through the surface layer portion and permeates downward is filled with the granular material in the concave portion formed by the water shielding sheet. savings rainwater reservoir by roadbed section that is formed by Sidewalk portion pavement structure, characterized by. The water-impervious sheet that forms the concave portion is extended to a height position close to the surface layer portion to form a high water level rainwater storage tank that can raise the rainwater level in the concave portion to the vicinity of the surface layer portion . The sidewalk pavement structure according to claim 1. A surface layer portion above the high water level rainwater storage tank is provided with a belt-like opening, and a bottom plate part located below the water level of the rainwater stored below the belt-like opening is disposed to store the high water level rainwater. The sidewalk portion pavement structure according to claim 2, wherein an open water channel into which rainwater in the tank flows is formed by the bottom plate portion and a belt-like opening. A plurality of the high water level rainwater storage tanks are provided at intervals in the longitudinal direction of the sidewalk part, and the open water channel is provided so as to connect the adjacent high water level rainwater storage tanks to each other. 4. The sidewalk pavement structure according to claim 3 , wherein rainwater stored from an upstream high water level rainwater storage tank toward a downstream high water level rainwater storage tank is allowed to flow naturally through the open water channel.

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