JPH07166504A - Water permeable road pavement structure - Google Patents

Abstract

PURPOSE:To obtain a road pavement structure having a sufficient water- rataining and adjusting function and a sufficient strength, by superposing a pressure-resistant layer internally holding aqueducts and a water-rataining space enclosing water spray tubes, under the surface course of the road. CONSTITUTION:Concrete vessels opened at their tops are arranged to be adjacent to each other so as to form a water-retaining space 8. Rain water penetrating in the surface course 1 from joints is led through a water-permeable base course 2 composed of gravels or the like to aqueducts 5 opened below the base course 2 and evenly discharged from a number of spray holes provided on the front end of aqueducts 5 into the water-retaining space 8. This rain water is once reserved in the water retaining space 8 and thereafter, poured into the subgrade through the lower second water-proof layer 11 in accordance with the water quantity retained on the subgrade. The water retaining space 8 serves not only to support the base course as its original mission but also to reserve water and adjust the outflow and hence, it prevents the subgrade from softening due to excess water content in the subgrade and breaking of a subbase course due to a localized torrential downpour.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a water-permeable pavement for roads, and more specifically, to protect the environment by actively penetrating into the ground without draining rainwater into drains. It also contributes to the amount of accumulated water in the roadbed and naturally adjusts the amount of water discharged to the roadbed to prevent it from weakening the ground and causing damage to the roadbed during heavy rainfall. Moreover, since it does not discharge a large amount of water into the river at one time, it relates to a structure of a new permeable road pavement that is strong enough to prevent flooding of the river and that can be easily treated aftercare.

[0002]

2. Description of the Related Art In conventional asphalt pavement and concrete pavement, CBR is used for roadbed soil and granular roadbed materials.
It is common to determine the thickness of the roadbed by conducting a test or a flat plate load test. However, since the infiltration method has been widely adopted in recent years, the inferiority of the surface layer occurs due to the damage of the roadbed due to the infiltration water everywhere, and the desired effect of the test result is not obtained.

[0003]

As described above, in the conventional infiltration type construction method, crushed stones and asphalt are alternately laid in several layers as a layer having a thickness of about 20 mm, or the lower layer subbase of the water-permeable pavement is left as it is. In this case, it is a common method to infiltrate the roadbed, which has caused the roadbed to be destroyed. In addition, due to the occasional heavy rainfall, it was not possible to control the inflow to the river, resulting in flooding.

[0004] Therefore, the development of a roadbed having both a sufficient water retention adjusting function and a sufficient strength is awaited, and also rainfall and the like is actively permeated into the ground, and after the activity of living things, it is released into the atmosphere. It is a social requirement to protect the natural water circulatory system by vaporizing it.

[0005]

As a result of taking these points into consideration, in the present invention, the surface layer of the road is a layer provided with a water-permeable joint, and the base layer is a layer of a water-permeable cushion made of gravel or the like. The upper layer roadbed is provided with a pressure resistant layer made of concrete or asphalt that has a water conduit that penetrates vertically, which supports the upper layer and also serves to guide the water permeation from the base layer downward. is there. Furthermore, the lower roadbed includes a sprinkler pipe that connects the permeate from the base layer to the water conduit, forms a water retention layer that temporarily stores the permeate that flows out from it, and discharges excess water beyond its capacity. In addition, a concrete layer having a large number of drainage holes is provided on the lower bottom of the structure so that drainage from the water retaining layer is discharged to the roadbed facing the lower surface.

[0006]

As described above, in the structure of the present invention, for example, rainwater and the like that have permeated from the joints of the surface layer are led to the water conduit opening to the lower part thereof through the water permeable cushion layer made of gravel and the like, and are provided to the water spray pipe at the tip thereof. Water is evenly discharged into the water retaining layer from the multiple water spray holes. This water is once stored in the water retention layer, and then the amount of outflow to the roadbed is naturally adjusted due to the amount of accumulated water in the roadbed. It also controls the storage and outflow, so that the retention of rainwater etc. in the subgrade can be maintained at an appropriate amount.

Therefore, according to the structure of the present invention, it is possible to effectively infiltrate into the ground without contributing to the drainage ditches of rain on the surface of the road, contributing to environmental protection, and when a heavy rainfall occurs. However, there is no risk of damaging the roadbed by excessively discharging water, and since a large amount of water will not be temporarily discharged into the river, it will prevent flooding of the river. With such an infiltration method, the unevenness of the surface layer is prevented without causing softening of the ground, and thus the traffic load is safely supported. Further, if the surface layer is made of paving stones, the roadbed of the present invention method has an advantage that it can be easily replaced when performing repair work such as changing the road.

[0008]

EXAMPLE A structure of the present invention will be described below with reference to the drawings. Rainwater is applied to a joint material 1b interposed between a pavement 1a in which a paving stone pavement 1 forming a surface layer is arranged and a pavement 1a 'adjacent thereto. Etc. permeate and further permeate down into the gravel layer 2 therebelow. Thickness 20c provided under the gravel layer
The upper surface of the first pressure resistant layer 3 of the concrete member having a size of about m is 1 toward the water collecting concave portion indicated by broken lines 3a and 3b from the peripheral portion.
The slope is about 5/000 downhill. In the case of this embodiment, 5 units in the long dimension (197 mm) direction and 10 units in the short dimension (97 mm) direction of the pavement are arranged as one unit, and these units are adjacent to each other to form the roadbed and the surface layer. They are arranged so that they are formed one after another.

The rainwater and the like that have permeated and fallen into the gravel layer 2 flow down toward the central portion 4 on the water collecting recesses 3a and 3b and flow into the water conduit 5 having a diameter of about 13 mm and opening at the portion 4. , Flows down in the pipe 5 and reaches the elbows 6, 6'of the water conduit. From the elbows 6 and 6 ', sprinkler pipes 5a, 5b, 5c and 5d, whose ends are respectively closed, are connected and branched, and the rainwater that has flowed down flows into the respective pipes. In addition, the inside of these branch sprinklers is filled with coarse particles to have the effect of reducing the impact of the water flow, and also has the function of reinforcing the pressure applied from the outside of the pipes. A plurality of sprinkler holes 7 are provided in these branch sprinkler pipes, and rainwater and the like that have flowed into the pipes are evenly distributed and flown into the water retention layer 8 through these holes to scour the water retention layer 8. Is being prevented. A metal net 9 is provided at the upper open end 51 of the water conduit 5 to prevent fine particles and dust from the gravel layer 2 from entering the water conduit. As shown in FIG. 5, the perforations 7 are provided from the root of the pipe toward the end thereof in a spiral shape from the upward surface of the pipe to the downward surface thereof, so that drainage is more evenly performed in consideration of water pressure. It is. Further, when there is rainfall exceeding the capacity of the water retention layer, water is discharged from the spillway 10 provided in the water retention layer, so that an appropriate amount of water in the layer can be managed. Further, the second pressure resistant layer 1 of the concrete member having a large number of discharge holes 12 provided therebelow.
1 is provided to slow down the discharge to the roadbed and prevent damage to the roadbed.

In this way, the rainwater, etc. that has flowed into the water retention layer is temporarily stored, and the outflow amount from the water retention layer is naturally adjusted according to the amount of accumulated water in the road bed. In addition to preventing weakening due to water content, it also prevents the rainwater that flows into the river through the drainage channel when a heavy rainfall occurs, and thus reduces the risk of flooding of the river.

[0011]

As described above, according to the structure of the present invention, rainwater or the like that has permeated from the surface layer composed of water-permeable joints is received by the water-retaining layer through the base layer composed of the water-permeable cushion and the water conduit that opens below the base layer. As a result, the amount of accumulated water in the roadbed is naturally adjusted to control the amount of water discharged to the roadbed, and as a result, the amount of accumulated rainwater in the ground is adjusted. Therefore, it does not drain rainwater to the surface of the road into drains, and penetrates deeply into the ground to contribute to environmental protection. There is no risk of damaging the floor, and it has the effect of not weakening the ground.Accordingly, the lower roadbed that also functions as a water retention layer, together with its strength, prevents the occurrence of unevenness on the surface layer and safely supports the traffic load. obtain. Further, the lower roadbed also serving as the water retaining layer has a structure in combination with the surface layer of the paving stone pavement, and has an effect that it can be easily replaced when performing repair work such as changing the road.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of the present invention.

FIG. 2 is a plan view showing the structure of the present invention.

FIG. 3 is an explanatory diagram of a water conduit and a water spray pipe.

FIG. 4 is an explanatory diagram of an opening portion of a water conduit.

FIG. 5 is an explanatory diagram showing an arrangement of discharge holes of a water sprinkler.

FIG. 6 is an explanatory diagram of the upper surface of the first breakdown voltage layer.

7a is a cross-sectional view taken along the line AA of FIG.

7b is a sectional view taken along line BB of FIG.

7c is a cross-sectional view taken along line CC of FIG.

[Explanation of Codes] 1 : Surface layer 2: Base layer 3: First pressure resistant layer 5: Water conduit 5a, 5b, 5c, 5d: Water sprinkler 8: Water retaining layer 11: Second pressure resistant layer

Claims (6)

[Claims] 1. A permeable joint is provided on a surface layer of a road, and a base layer on the lower surface thereof is a permeable cushion made of gravel or sand,
Furthermore, a first pressure resistant layer made of a member such as concrete or asphalt that internally installs a water conduit penetrating vertically in the upper layer roadbed below it is provided, and while carrying the surface layer and the base layer, guiding water permeation from the base layer downward, Further, the lower layer roadbed includes a sprinkling pipe connected to the water guiding pipe to form a water retention layer for temporarily storing the permeated water flowing out from the sprinkling pipe, and a spillway for discharging water in excess of the capacity of the layer. With a different configuration,
Further, a second pressure resistant layer made of a concrete member having a large number of drainage holes is provided on the lower bottom thereof, and the drainage from the water retention layer is discharged to the roadbed facing the lower surface of the layer. Permeable road pavement structure with. 2. The permeable road pavement structure according to claim 1, wherein the water retaining layer has a configuration in which concrete containers having upper openings are arranged so as to be adjacent to each other. 3. The water is collected by providing a water channel on the top end surface of the first pressure-resistant layer, which is inclined from the peripheral edge toward the center thereof, and by providing a water conduit vertically penetrating the center. The permeable road pavement structure according to claim 1 or 2. 4. The water-spraying tube contained in the water-retaining layer is a plurality of branch pipes, and a plurality of water-spraying holes are formed in each of the branching pipes to make the water-spraying even over the entire surface of the water-retaining layer. The water-permeable road pavement structure according to claim 1. 5. The sprinkling pipe is filled with a material of coarse particles so as to reduce the water flow and reinforce the pressure applied to the outer wall of the pipe. Permeable road pavement structure. 6. The water sprinkling pipe has a plurality of water sprinkling holes which are provided in a spiral shape in order from a root of the pipe toward an end thereof, from an upward surface of the pipe to a downward surface thereof. The permeable road pavement structure according to 1 or 2.