JP2001011803A - Pavement structure in sidewalk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pavement structure in a sidewalk which stores rainwater which has fallen on the pavement below the surface course for efficient use. SOLUTION: An impervious sheet 15 is laid to form a recessed shape between the subgrade and the base course 17 and a granular material 16 is filled in the recessed part to show 30% or more in aggregate porosity and form a base course 17 provided with a strength having 30 or more in a modified CBR and 1×10-1 cm/sec in permeability coefficient. Further, a nonwoven fabric 18 is laid on the surface of the base course 17 and sand cushion is laid and then, water permeable blocks 20 having 1×10-2 cm/sec or more in permeability coefficient to form a surface course 27. Rainwater which has passed through the surface course 27 and penetrated to the lower side is stored in a recessed rainwater storage tank 21 filled with the granular material 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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 falling on a road surface below a surface layer.

[0002]

2. Description of the Related Art Generally, when rainwater falls on a pavement of a sidewalk of a road (including a bicycle path and a promenade where heavy vehicles do not pass), drainage is generally performed on the side of the sidewalk. Drainage facilities such as gutters are provided in the drainage facilities, and rainwater is introduced into the drainage facilities and drained out of the sidewalk. Also, the sidewalk is not subjected to a large repeated load from heavy vehicles and the like, and therefore, the roadbed and the roadbed do not require high supporting force and durability. In some cases, a permeable pavement is used, which is infiltrated into the subgrade to be reduced into the ground.

On the other hand, rainwater is a natural and useful resource, and it is desirable to make effective use of it. However, if such rainwater is directly removed to water distribution facilities or penetrated into the ground, it will not be possible to use it on the sidewalk. When used for the surrounding environment such as cleaning and vegetation, it is necessary to pump groundwater from deep underground or to supply it from a distant storage facility, and it is not possible to use rainwater efficiently. Was.

The present invention has been made in view of the above-mentioned conventional problems, and provides a sidewalk pavement structure capable of storing rainwater that has fallen on a pavement surface below a surface layer and efficiently using the same. The purpose is to do.

Another object of the present invention is to provide a sidewalk pavement structure capable of forming a ground surface space that has a favorable effect on vegetation, insects, microorganisms, and the like, and that eases pedestrians. I do.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a sidewalk pavement structure having a function of storing rainwater falling on a pavement surface below a surface layer, wherein the pavement structure is provided between a subgrade and a subgrade. A water-impervious sheet is laid in a concave shape in the roadbed portion, and the concave portion formed by the water-impervious sheet is filled with the granular material so that the aggregate porosity is 30% or more, and the modified CBR has a strength of 30 or more and 1 × 1
Forming a roadbed part having a permeability of 0 ^-1 cm / sec or more;
Laying a cushion material made of sand with laying sand falling prevention member according to a nonwoven fabric or the like on the surface of the該路platen, hydraulic conductivity on the surface of the cushion material is a 1 × 10 ^-2 cm / sec or more permeable block A sidewalk pavement structure, which is constituted by laying and forming a surface layer portion, wherein rainwater passing through the surface layer portion and penetrating downward is stored in a rainwater storage tank formed by the concave portion filled with the granular material. By providing
The above object has been achieved (the invention of claim 1).

Further, in the sidewalk pavement structure according to the present invention, the water-impervious sheet forming the concave portion is extended to a height position close to the surface portion, and the water level of rainwater in the concave portion is adjusted to the surface portion. Forming a high-level rainwater storage tank that can rise to the vicinity of the high-level rainwater storage tank, and providing a band-shaped opening in the upper surface portion of the high-level rainwater storage tank and lower than the water level of the rainwater stored under the band-shaped opening. It is preferable to dispose a bottom portion located at a position above, and to form an open water channel into which rainwater of a high-level rainwater storage tank flows by the bottom portion and the band-shaped opening (the invention according to claim 2).

Further, in the sidewalk pavement structure according to the present invention, a plurality of the high-level rainwater storage tanks are provided at intervals in the longitudinal direction of the sidewalk section, and the open waterway connects the adjacent high-level rainwater storage tanks to each other. It is provided so as to be connected, so that rainwater stored from the high-level rainwater storage tank on the upstream side to the high-level rainwater storage tank on the downstream side flows down naturally through the open water channel according to the vertical gradient of the sidewalk portion. (The invention according to claim 3).

Further, the sidewalk pavement structure of the present invention comprises:
As the granular material, it is preferable to use an industrial waste granular material composed of an industrial waste such as a solidified recycled aggregate or a resin-based industrial waste (the invention according to claim 4).

[0010] In the above description, the hydraulic conductivity is J
It is measured by the test method specified in IS A1218. Also, the modified CBR is KODAN A
It is measured by the test method specified in 1211.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Sidewalk pavement structure 1 in general storage tank section (see FIG. 4) of the present embodiment
0 is, for example, as shown in FIG.
This is adopted when forming the sidewalk portion 12 provided along. The roadway section 11 is a so-called drainage pavement, in which rainwater that has fallen on the roadway section 11 partially flows under the sidewalk section 12 through the pavement section 13, and is provided by a known rainwater drainage facility. 12 outside.

The sidewalk pavement structure 10 of the present embodiment is shown in FIG.
As shown in FIG. 2, the original ground is excavated in a concave shape, and a water-impervious sheet 15 is laid in a concave shape along a subgrade surface 14 formed by leveling. While filling the material 16, a roadbed portion 17 having a modified CBR having a strength of 30 or more and a hydraulic conductivity of 1 × 10 ^-1 cm / sec or more is formed. Then, a nonwoven fabric 18 is laid on the surface of the roadbed portion 17 as a sand flow-down preventing material, and a sand cushion 19 made of coarse sand is laid, and the surface of the sand cushion 19 has a water permeability of 1 × 10 ⁻² cm / sec or more. Are formed by laying out the water-permeable blocks 20 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-blocking sheet 15 with the granular material 16 so that the aggregate porosity is 30% or more. A stormwater storage tank 21 capable of storing a large amount of rainwater by the porosity is formed.

Here, the subfloor forming the subfloor surface 14 is:
It can be formed by laying a subgrade material (for example, sand) having a predetermined thickness (for example, about 5 cm) on the bottom surface of the excavation. However, when the excavation ground is suitable for the subgrade material, As a floor portion, the roadbed portion 17 can be formed directly above the floor portion.

The water-blocking sheet 15 is a well-known water-blocking sheet for civil engineering having a thickness of, for example, about 1.5 mm.
It is preferable to use one having excellent durability and economy. The inside of the water-blocking sheet 15 laid in a concave shape is filled with the granular material 16 to form the roadbed section 17, so that the water-blocking sheet 15 is interposed between the roadbed section and the roadbed section 17. .

According to the present embodiment, the roadbed portion 17 is formed.
Solidified recycled aggregate produced from sludge as granular material 16
(Polynite) and resin-based industrial waste (vinyl chloride, etc.)
Industrial waste granular material consisting of mixed recycled aggregate is used
You. This granular material of industrial waste is filled between aggregates after filling and compaction.
The particle size is adjusted so that the porosity is about 40%.
The roadbed part 17 formed by the process is a granular material such as crusher orchid.
Modification that is equivalent in strength to general footboards using materials
CBR has strength of 30 or more and 1 × 10 ^-1cm / sec
It will have the above water permeability. This embodiment
According to the roadbed section 17, the thickness is about 30 to 80 cm
Is formed.

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. The unit volume weight is 300g
/ M ² is laid on the upper surface of the roadbed section 17 and used.

The sand cushion 19 has a function of facilitating the work of laying the water permeable blocks 20 constituting the surface layer portion 27 and distributing the upper load applied to the water permeable blocks 20 to the roadbed portion 17. And non-woven fabric 1
8 is laid on the upper surface of the roadbed section 17 with a thickness of, for example, about 3 mm using coarse sand so as to make it difficult to pass through the base 8.

Provided on the upper surface of the sand cushion 19
The surface layer portion 21 has a water permeability of 1 × 10 ^-2cm / sec or more, bending
Strength is 4N / mm^TwoAbove rectangular water-permeable block 20
Are laid out in rows and columns in a thickness of about 6 cm.
The water-permeable block 20 is made of a reinforcing admixture material such as a polymer.
300 to 500 kg / m using^TwoMixed with ceramic waste
And a porosity of about 20%.

According to this embodiment, the water-impervious sheet 15 is laid on the side of the roadway section 11 to a height substantially equal to the upper end surface of the roadbed layer 29 of the roadway section 11 and has a drainage property. 11 allows a part of the rainwater falling on the roadway section 11 to flow from the pavement section 13 to the rainwater storage tank 21 and, on the side opposite to the roadway section 11, the one-sided penetration provided on the opposite side. The rainwater that is laid to a height substantially equal to the height of the upper end of the side groove 22 and overflows from the rainwater storage tank 21 can be removed to the outside of the rainwater storage tank 21 through the one-side permeation side groove 22.

A strip-shaped opening 24 is formed in the center of the upper portion of the sidewalk pavement structure 10 in the direction of extension of the sidewalk portion 12, and a bottom portion 26 is formed below the side wall portion 25 through a side wall portion 25.
Is provided, as will be described later, the open water channel 23 that connects the adjacent high water level rainwater storage tanks 31 to each other.
Is provided.

According to the present embodiment, the rainwater that has fallen on the surface portion 27 constituting the pavement surface penetrates into the roadbed portion 17 due to the permeability of the surface 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 is fed to a greening facility (slope, vegetation,
To the greening soundproof wall, etc.), or as water for road cleaning and water for disaster prevention, which can be efficiently used for the surrounding environment. Further, since rainwater is stored below the road surface of the sidewalk section 12, the stored water is evaporated during fine weather, and heat evaporation is used to suppress the formation of heat islands, thereby making it possible to bring the heat circulation closer to a natural state.

Further, according to the present embodiment, the roadbed portion 17
By using the industrial waste granular material as the granular material 16 that forms the wastewater, it is possible to reduce the disposal cost spent on the industrial waste and contribute to social benefits, Use of ceramic waste, which is industrial waste, as a constituent material will further contribute to social benefits.

FIG. 3 shows a sidewalk pavement structure 30 in a high-water storage tank section (see FIG. 4) according to another embodiment of the present invention. According to the sidewalk pavement structure 30, the general storage tank is used. The structure has substantially the same structure as the sidewalk pavement structure 10 in the section, but the water-blocking sheet 15 laid along the concave road surface 14 is up to a height position close to the surface layer 27 by the water-permeable block 20. This is different in that it is extended, thereby forming a high-water-level rainwater storage tank 31 capable of raising the level of rainwater stored in the water-shielding sheet 15 to the vicinity of the surface layer portion 27.

The surface layer 27 above the high-level rainwater storage tank 31 has a general storage tank section extending from the end of each high-level rainwater storage tank 31 to the end of the adjacent high-level rainwater storage tank 31. An open water channel 23 is provided so as to vertically connect the upper part of the sidewalk pavement structure 10 and to connect the adjacent high water level rainwater storage tanks 31 on the upstream and downstream sides. That is, the open channel 23 extends along the surface section 19 along the longitudinal direction.
And a bottom plate 26 made of, for example, a concrete board disposed immediately below the band-shaped opening 24 via a side wall 25 made of concrete, and the bottom plate 26 is for storing high-level rainwater. It is located below the level of rainwater in the tank 31.

Therefore, as shown in FIG. 4, the open water channel 23 is provided with a high water level rain water storage tank 31 provided alternately with the rain water storage tank 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 section 12, the stored rainwater is connected to each other and the high-water rainwater storage tank 31 on the upstream side is used.
The water is allowed to flow naturally through the open water channel 23 from the downstream to the high water level rainwater storage tank 31 on the downstream side. Note that natural stones are laid in the open waterway 23 so as to be close to a natural stream.

The rainwater thus collected is guided by the open channel 23, whereby the rainwater is repeatedly sent to the downstream side while being purified between gravels, and has a favorable effect on vegetation, insects, microorganisms, and the like. The babbling that gives and gives pedestrians peace will be created.

Note that the present invention is not limited to the above embodiment, and various changes can be made. For example, it is not always necessary to provide an open channel, and the granular material constituting the roadbed portion does not necessarily need to be an industrial waste granular material. The adjacent roadway does not necessarily need to be drainage pavement. Further, the sidewalk pavement structure may be provided independently as a promenade without being adjacent to the roadway. Furthermore, it is not always necessary to provide a water-impervious sheet at the boundary between the roadbed and the roadbed, and the rainwater storage tank can be formed by being buried in the roadbed in a concave shape.

[0028]

According to the sidewalk pavement structure of the present invention, rainwater that has fallen on the pavement surface can be stored below the surface layer and used efficiently. In addition, for example, by providing an open waterway, it is possible to form a ground surface space that has a favorable effect on vegetation, insects, microorganisms, and the like, and that eases pedestrians.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along AA of a general storage tank unit 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.

FIG. 3 is a cross-sectional view taken along line BB of the high-water storage tank portion of FIG. 4, showing a sidewalk pavement structure according to another embodiment of the present invention.

FIG. 4 is a plan view showing an arrangement state of an open channel.

[Explanation of symbols]

 10, 30 Sidewalk pavement structure 11 Roadway section 12 Sidewalk section 13 Pavement section in roadway section 14 Roadbed surface 15 Waterproof sheet 16 Granular material 17 Roadbed section 18 Nonwoven fabric (sand flow prevention material) 19 Sand cushion 20 Water permeable block 21 Rain water Reservoir 23 Open channel 24 Strip-shaped opening 26 Bottom part 27 Surface layer 31 High water level rainwater reservoir

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000230836 Nippon Kogyo Co., Ltd. 721-2, Kamifukuoka-cho, Takamatsu-shi, Kagawa (72) Inventor Yuji Koseki 2-12-36 Numakage, Urawa-shi, Saitama Inside the research institute (72) Inventor Shinichi Morioka 3-4-7 Toranomon, Minato-ku, Tokyo Sekisui Chemical Industry Co., Ltd. (72) Inventor Tatsuo Togo 731-1 Ryuo-cho, Gamo-gun, Shiga Prefecture Sekisui Jushi Corporation ) Inventor Shoda Wada 721-2 Kamifukuokacho, Takamatsu-shi, Kagawa Japan F-term (reference) 2D051 AB03 AD07 DA01 DA13 2D063 AA01 AA17

Claims (4)

[Claims] 1. A sidewalk pavement structure having a function of storing rainwater falling on a pavement surface below a surface layer, wherein a water-impervious sheet is formed between a subgrade and a subbase or in a subbase. The modified CB is filled with the granular material in the concave portion formed by the water-impervious sheet so that the aggregate porosity is 30% or more.
A cushion made of sand or the like is formed by forming a roadbed portion having a strength of R of 30 or more and a water permeability of 1 × 10 ^-1 cm / sec or more, and laying a sand flow preventing material such as a nonwoven fabric on the surface of the roadbed portion. It is constructed by laying a material and arranging a water-permeable block having a water permeability of 1 × 10 ^-2 cm / sec or more on the surface of the cushion material to form a surface layer portion, and penetrating downward through the surface layer portion. A sidewalk pavement structure, wherein rainwater to be stored is stored in a rainwater storage tank formed by a concave portion filled with the granular material. 2. A high water level rainwater which can extend a water barrier sheet forming the concave portion to a height position close to the surface layer portion, and can raise a water level of the rainwater in the concave portion to near the surface layer portion. A storage tank is formed, and a band-shaped opening is provided in a surface layer above the high-water-level rainwater storage tank, and a bottom portion located below the level of rainwater stored below the band-shaped opening is provided. 2. An open channel through which rainwater of a high-level rainwater storage tank flows in is formed by the bottom portion and the band-shaped opening.
Sidewalk pavement structure according to 1. 3. A plurality of the high-level rainwater storage tanks are provided at intervals in a longitudinal direction of a sidewalk, and the open channel is provided so as to connect the adjacent high-level rainwater storage tanks to each other; The rainwater stored from the high-level rainwater storage tank on the upstream side toward the high-level rainwater storage tank on the downstream side according to the vertical gradient of the sidewalk portion is caused to flow naturally through the open channel. Sidewalk pavement structure. 4. The sidewalk pavement structure according to claim 1, wherein the granular material is an industrial waste granular material made of an industrial waste such as a solidified recycled aggregate or a resin-based industrial waste.