JPH11280007A - Pavement material for draining elastic pavement, and draining elastic pavement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pavement material for a draining elastic pavement, having little sinking of wheels, having high adhesive force to a roadbed, and excellent in performance for draining water impregnated in the material in raining. SOLUTION: A pavement material 10 is a flat plate having the thickness in the range of 20 to 50 mm and formed by mixing urethane binder to a rubber chip aggregate, compression-molding it, and hardening it by processing at 150 deg.C for 10 minutes. The spring constant of the pavement material may be in the range of 30 to 120 kgf/mm, preferably, in the range of 40 to 100 kgf/mm. Therefore, sinking of wheels of the vehicle to the pavement material can be decreased. A plurality of drain holes 11 extending from the front surface 10a side to a contact surface 10b as the back surface and having the circular sections are provided on the pavement material, water is absorbed in drain holes if there are puddles on the front surface in raining, and therefore, drainage performance can be improved without increasing the porosity. Accordingly, the coefficient of friction in braking of the wheels can be prevented from being deteriorated while maintaining strength of the pavement material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage elastic pavement material used for general roads and the like, and a drainage elastic pavement structure using the same.

[0002]

2. Description of the Related Art Conventionally, as a pavement material for this kind of drainable elastic pavement, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-315708, an elastic material such as rubber chips obtained by pulverizing rubber products such as automobile waste tires is disclosed. There is known an aggregate obtained by mixing a binder such as urethane or epoxy with an aggregate. This pavement material is elastic and softer than normal asphalt pavement by using rubber material, and
By setting the porosity to several tens of percent during molding, high water permeability can be obtained, and sound of a specific frequency transmitted from the vehicle can be absorbed by the gap, so that traffic noise can be significantly reduced. Has excellent properties.

[0003]

However, when the porosity is increased to several tens of percent, the rigidity of the pavement material is reduced, so that the wheels of the traveling vehicle are more likely to sink into the pavement material. As a result, there is a problem that the steering stability of the vehicle is impaired. Therefore, it is necessary to consider the problem of sinking into the pavement material of the vehicle due to other characteristics other than the porosity.

When a pavement material is used for a general road, it is necessary to have a high adhesive strength to a roadbed. However, a conventional pavement material has an insufficient adhesive force. Furthermore, since the water inside the pavement material is not completely drained during rainfall etc., the elastic pavement road surface is deflected by the load when the vehicle is running, and the water comes out around the wheels, reducing the friction coefficient of the road surface during braking. There is also the problem of lowering. In contrast,
In order to improve the drainage performance of the pavement material, it is necessary to increase the porosity of the pavement material, but by increasing the porosity, the strength of the pavement material itself decreases as described above,
The stiffness will also decrease. Therefore, the drainable elastic pavement has not been widely used for pavement on general motorways or highways. The present invention is intended to solve the above-described problem, and absorbs sound of a specific frequency transmitted from a vehicle, has a small sinking of wheels, has a high adhesive strength to a roadbed, and has an internal An object of the present invention is to provide a drainage elastic pavement pavement material and a drainage elastic pavement structure excellent in drainage of water soaked.

[0005]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to claim 1 is that an elastic aggregate and a binder are mixed and formed into a plate shape. A pavement material that is adhered to a roadbed to form a drainable elastic pavement, and has a spring constant of 30 to 120 k.
gf / mm. In addition, as the elastic aggregate, a rubber chip or a rubber chip including a wood chip or the like is used. The spring constant is 40 to 100 kgf.
/ Mm is more preferable.

In the invention according to claim 1 having the above-described structure, if the spring constant is 30 kgf / mm or more, it is possible to reduce sinking of the vehicle wheels into the pavement material, and to achieve good noise absorption and Drainage is obtained. If the spring constant is 120 kgf / mm or less, noise absorption and drainage can be ensured.

A structural feature of the invention according to claim 2 is that the elastic aggregate and the binder are mixed and formed into a plate shape, and are adhered to the roadbed to form a drainable elastic pavement. And a drain hole that penetrates from the surface side to the contact surface side with the roadbed.

[0008] In the invention according to claim 2 configured as described above, the pavement material is provided with a drain hole that penetrates from the surface side to the contact surface side with the roadbed, so that water can be provided on the road surface during rainfall or the like. Even if water accumulates, it is absorbed by the drain holes, so that the drainage performance can be improved without increasing the porosity. As a result, according to the second aspect of the present invention, since the drainage performance can be enhanced while maintaining the strength of the pavement material, a decrease in the friction coefficient of the road surface during braking of the vehicle can be prevented, and the hydroplaning phenomenon can be suppressed. Can be. Further, since the adhesive used for bonding the pavement material and the roadbed enters the drain holes and accumulates, the adhesive strength between the pavement material and the roadbed is increased.

According to a third aspect of the present invention, there is provided the pavement material for drainable elastic pavement according to the second aspect, wherein a cross-sectional area of the drain hole is closer to a contact surface side with the roadbed. Is made smaller than the surface side. In the invention according to claim 3 configured as described above, in addition to the effect of the invention described in claim 2, a state in which the adhesive that has entered the drain hole and hardened is firmly engaged with the drain hole. Therefore, the adhesive strength between the pavement material and the roadbed is further increased.

A structural feature of the invention according to claim 4 is that, in the pavement material for drainable elastic pavement according to claim 2 or 3, the drain hole has an irregular shape. In the invention according to claim 4 configured as described above, in addition to the effects of the inventions described in claim 2 and claim 3, the drain hole is formed in a modified shape other than a simple circular shape. Since the contact area between the adhesive that has entered the inside and the drainage hole is increased, the adhesive strength between the pavement material and the roadbed is further increased. In addition, the contact between the drain hole and the tire tread portion of the vehicle on the surface of the pavement material is tightly performed,
The frictional resistance at the time of vehicle braking can be increased.

A structural feature of the invention according to claim 5 is that, in the paving material for drainable elastic pavement according to any one of claims 2 to 4, a drainage channel is provided on the contact surface side. In addition, at least two or more drain holes are connected to the drain channel. In the invention according to Claim 5 configured as described above, in addition to the effects of the inventions described in Claims 2, 3, and 4, the drainage channel is connected to the drainage side of the road shoulder to improve drainage efficiency. Can be significantly increased. In addition, since the water in the drain hole pushed by the wheel is pushed out to another drain hole through the drain passage, the amount of water floating near the wheel can be reduced, and a decrease in the frictional resistance of the pavement material surface can be prevented.

According to a sixth aspect of the present invention, in the pavement material for drainable elastic pavement according to any one of the second to fifth aspects, the arrangement density of the drain holes is changed depending on the location. It has changed. In the invention according to claim 6 configured as described above, claims 2, 3, 4,
In addition to the effect of the invention described in 5, the drainage holes can be provided in a large number of places such as intersections and curves where braking is required, so that the braking effect can be enhanced. Can be reduced, and the appropriate function of the paving material can be exhibited for each location. In addition, it is possible to adjust the arrangement density of drain holes to be high in an area with a large amount of rain, and to reduce the arrangement density in an area with a small amount of rain.

According to a seventh aspect of the present invention, there is provided the pavement material for drainable elastic pavement according to any one of the second to sixth aspects, wherein a spring constant is 30 to 1.
20 kgf / mm. Note that the spring constant is more preferably 40 to 100 kgf / mm. In the invention according to claim 7 configured as described above, in addition to the effects of the invention described in claims 2, 3, 4, 5, and 6, the sinking of the wheel can be reduced, and the noise absorption is good. And drainage property is obtained.

A structural feature of the invention according to claim 8 is that a drainable elastic pavement formed by bonding a plate-like pavement formed of an elastic aggregate and a binder to a roadbed. A plurality of drainage holes penetrating the pavement material from the surface side to the contact surface side with the roadbed, and a drainage groove is provided on the roadbed surface, and at least two or more drainage holes are connected to the drainage groove. It is in.

In the invention according to claim 8 configured as described above, the drainage groove provided on the roadbed is connected to the drainage side of the road shoulder, so that the drainage efficiency can be significantly improved. Further, the water in the drain hole pushed by the wheel is pushed out to another drain hole through the drain groove, so that the amount of water floating near the wheel can be reduced, and the frictional resistance of the road surface can be increased. Furthermore, by providing a drainage ditch on the roadbed,
It is also possible to suppress a decrease in the strength of the paving material.

According to a ninth aspect of the present invention, in the drainage elastic pavement structure according to the eighth aspect, the sectional area of the drainage hole is such that the surface area is closer to the contact surface side with the roadbed. Is to be smaller than the side. In the invention according to claim 9 configured as described above, in addition to the effect of the invention described in claim 8, in addition to the fact that the adhesive that has entered the drain hole and solidified engages the drain hole firmly. Further, the adhesive strength between the pavement material and the roadbed is further increased.

Further, a structural feature of the invention according to claim 10 is that, in the drainable elastic pavement structure according to claim 8 or 9, the drain hole has an irregular shape. In the invention according to claim 10 configured as described above, in addition to the effects of the inventions described in claims 8 and 9, in addition to the contact between the adhesive that has entered the drain hole and solidified and the drain hole. Since the area is increased, the bonding strength between the pavement material and the roadbed is further increased. In addition, the contact between the drain hole on the surface of the pavement material and the tire tread portion of the vehicle is made tight, and the frictional resistance during vehicle braking can be increased.

The structural feature of the invention according to claim 11 is that in the pavement material for drainable elastic pavement according to any one of claims 8 to 10, the arrangement density of the drain holes is determined by the location. It has been changed by. In the invention according to Claim 11 configured as described above, in addition to the effects of the inventions described in Claims 8, 9, and 10, by providing a large number of drain holes at intersections, curves, and other places where braking is required. In addition, the braking effect can be enhanced, and the location density of drain holes can be reduced in places where the need for braking is small, and the appropriate function of the paving material can be exhibited for each place. In addition, it is possible to adjust the arrangement density of drain holes to be high in an area with a large amount of rain, and to reduce the arrangement density in an area with a small amount of rain.

According to a twelfth aspect of the present invention, in the drainage elastic pavement structure according to any one of the eighth to eleventh aspects, the paving material has a spring constant of 30 to 120 kgf. / Mm. In the invention according to claim 12 configured as described above, in addition to the effects of the inventions described in claims 8, 9, 10, and 11, the sinking of the wheel can be reduced, and good vibration absorption and Drainage is obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment of the present invention, FIG. 1 is a perspective view and a cross-sectional view showing a drainage elastic pavement paving material (hereinafter, referred to as a pavement material). The paving material 10
As shown in FIG. 1, a flat plate having a thickness of 20 to 50 mm,
A urethane binder is mixed with a rubber chip aggregate (a spindle type, a mesh type, a rough type, a cloth-containing type, and the like), compression-molded, and heat-treated at 150 ° C. for 10 minutes to be cured. The pavement material 10 may have a spring constant of 30 to 120 kgf / mm, and more preferably 40 to 100 kgf / mm.
Although the binder amount and the porosity are not particularly specified,
The binder amount is preferably 5 parts by weight or more based on 100 parts by weight of the rubber chip aggregate, and the porosity is 20 to 4 parts.
It is preferably in the range of 0%. For example, FIG. 3 shows a result of measuring a spring constant using a sample having a binder amount of 5 to 20 parts by weight and a porosity of 20 to 40% when the rubber chip is 100 parts by weight.

The measurement of the spring constant E is as follows.
Measurement sample of 0 mmφ × 30 mm (area S = 78.
5 cm ² ), a load P is applied thereto, and the deformation amount (corresponding to the sinking amount of the wheel) t at that time is measured.

[0022]

## EQU1 ## t = P / [T × (E / S)]

For example, a 10-ton truck (tire 10)
Assuming a tire contact area T = 400 cm ² )
Load P = 10 tons / 10 = 1 tons = 1000 kg, and when E = 50 kgf / mm, t = 3.9 mm. When E = 30 kgf / mm, t = 6.5 mm, and when E = 120 kgf / mm, t = 1.6 mm. It is necessary to select an appropriate value for the spring constant E according to the purpose of the road, the type of passing vehicle, and the like.

The pavement material 10 is provided with a large number of drain holes 11 having a circular cross section of 10 mmφ and penetrating from the front surface 10a side to the contact surface 10b which is the back surface. The cross-sectional shape of the drain hole 11 may be an elliptical shape, a polygonal shape such as a triangle or a quadrangle, or an irregular shape such as a star shape, in addition to a circular shape. By making the area of the drain hole 11 smaller than the tire pattern on the tire tread surface of the vehicle,
Vibration of the vehicle during traveling can be reduced.

As shown in FIG. 4, the pavement material 10 formed as described above is applied to a concrete or asphalt roadbed 13 laid on the ground 14 using an epoxy adhesive or a urethane adhesive 12. It is fixed by bonding, and a drainage elastic pavement structure is formed.

The pavement material 10 constructed as described above has an appropriate spring constant within a range of 30 to 120 kgf / mm. It can be made as small as about 6 to 6.5 mm, and the steering stability of the vehicle can be favorably maintained. In addition, since the porosity is also within the range of 20 to 40%, good noise absorption can be obtained.

The pavement material 10 has a drain hole 1 penetrating from the surface 10a side to the contact surface 10b side with the roadbed 13.
By providing 1, even if water accumulates on the surface 10a during rainfall or the like, the water is absorbed by the drain holes 11, so that the drainage performance can be improved without increasing the porosity. Therefore, the drainage performance can be enhanced while maintaining the strength of the pavement material 10, so that a reduction in the friction coefficient during braking of the vehicle can be prevented, and the hydroplaning phenomenon can be suppressed.

Further, as shown in FIG. 4, the adhesive 12 used for bonding the pavement material 10 and the roadbed 13 also enters and accumulates in the drain holes 11, so that the adhesive strength between the pavement material 10 and the roadbed 13 is increased. Is enhanced. In particular, by forming the cross-sectional shape of the drain hole 11 into an irregular shape such as a star shape, the contact area between the adhesive 12 that has also entered the drain hole 11 and solidified and the drain hole 11 is increased, so that the pavement material 10 And the roadbed 13 are further increased in adhesive strength. In addition, the contact between the drain hole on the surface of the pavement material 10 and the tire tread portion of the vehicle is made tight, and the frictional resistance during braking of the vehicle can be increased.

Next, a second embodiment will be described. In the present embodiment, as shown in FIG. 5, the pavement material 20 is formed in a conical shape in which the cross-sectional area of the drain hole 21 is larger on the surface 20 a side than on the contact surface 20 b side with the roadbed 13. . As a result, in addition to the effect shown in the first embodiment, the adhesive that has entered the drain hole 21 and solidifies and firmly engages the drain hole 21, so that the pavement material 20 and the roadbed 13
And the adhesive strength with the adhesive is further enhanced. 6 (a),
As shown in (b), the cross sections of the drain holes 22 and 23 are not conical, and the cross sectional area on the contact surface 20b side is substantially smaller than the cross sectional area on the surface 20a side. 6A and 6B are not limited to those shown in FIGS.

Next, a third embodiment will be described. In this embodiment, as shown in FIG. 7, the pavement material 30 is provided with a plurality of drain holes 31 penetrating from the front surface 30 a side to the contact surface 30 b which is the back surface, and is provided on the contact surface 30 b side with the roadbed 13. A drainage channel 32 is provided, and at least two or more drainage holes 31 are connected to the drainage channel 32.

In the third embodiment constructed as described above, by connecting the drainage channel 32 to the drainage side of the road shoulder, the drainage efficiency of the water collected on the surface side of the pavement material 30 can be significantly increased. it can. In addition, the water in the drain hole 31 pushed by the wheel flows through the drain passage 32 to another drain hole 31.
As a result, the amount of water floating near the wheels can be reduced, and a reduction in the frictional resistance of the pavement material surface can be prevented.

Next, a fourth embodiment will be described. In the present embodiment, as shown in FIG.
3 is provided with a drain groove 15 on the surface thereof, and at least two or more drain holes 41 are provided in the pavement material 40 bonded to the roadbed 13 so as to penetrate from the front surface 40a side to the contact surface 40b which is the back surface. The drain hole 41 and the drain groove 15 are connected to each other.

In the fourth embodiment configured as described above, similarly to the third embodiment, the drain grooves 15 are formed.
Is guided to the drainage side of the road shoulder, the drainage efficiency of the water collected on the surface side of the pavement material 40 can be significantly increased. Further, since the water in the drain holes 41 pushed by the wheels is pushed out to the other drain holes 41 through the drain grooves 15, the water floating near the wheels can be reduced, and the reduction of the frictional resistance of the pavement material surface can be prevented. .

In each of the above embodiments, the density of the drain holes can be changed depending on the location. For example, by providing a large number of drain holes at intersections, curves, and other places where braking is required, the braking effect can be enhanced, and in places where there is little need for braking, the density of drain holes is reduced and the strength of the pavement material is reduced. The decrease can be suppressed, and the appropriate function of the pavement material can be exhibited for each location. In addition, it is possible to adjust the arrangement density of drain holes to be high in an area with a large amount of rain, and to reduce the arrangement density in an area with a small amount of rain.

In each of the above embodiments, the spring constant of the paving material does not necessarily need to be in the range of 30 to 120 kgf / mm. Further, the elastic aggregate is not limited to a single rubber chip, but may include a piece of wood or the like. The binder is not limited to urethane, but may be epoxy or the like. The outer shape and dimensions of the drainage elastic pavement structure are not limited to those described in the above embodiment. Further, the use of the pavement material is not limited to the use for roads, but is also used for fields such as promenades and stadiums.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pavement material according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the paving material.

FIG. 3 is a graph showing a relationship between a spring constant and a binder amount of the pavement material using a porosity as a parameter.

FIG. 4 is a sectional view showing a drainage elastic pavement structure using the same pavement material.

FIG. 5 is a sectional view showing a pavement material according to a second embodiment.

FIG. 6 is a cross-sectional view illustrating a pavement material that is a modification of the second embodiment.

FIG. 7 is a sectional view showing a pavement material according to a third embodiment.

FIG. 8 is a sectional view showing a drainable elastic pavement structure according to a fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Paving material, 11 ... Drainage hole, 12 ... Adhesive, 13 ... Roadbed, 14 ... Ground, 15 ... Drainage groove, 20 ... Pavement material, 21
22, 23: drain hole, 30: pavement material, 31: drain hole, 3
2: drainage channel, 40: paving material, 41: drainage hole.

Claims (12)

[Claims] 1. A pavement material in which an elastic aggregate and a binder are mixed and formed into a plate shape and are adhered to a roadbed to form a drainable elastic pavement, wherein a spring constant is 30 to 1
A pavement material for drainage elastic pavement, which has a weight of 20 kgf / mm. 2. A pavement material in which an elastic aggregate and a binder are mixed and molded into a plate shape, and are bonded to a roadbed of a road to form a drainable elastic pavement. A drainage elastic pavement paving material characterized by having a drainage hole penetrating to the contact surface side of the pavement. 3. The pavement material for drainable elastic pavement according to claim 2, wherein a cross-sectional area of the drain hole is smaller on a contact surface side with the roadbed than on the surface side. A pavement material for drainage elastic pavement, characterized by that: 4. The pavement material for drainable elastic pavement according to claim 2 or 3, wherein the drain hole has an irregular shape. 5. The pavement material for drainable elastic pavement according to claim 2, wherein a drainage channel is provided on the contact surface side, and at least two or more drainage channels are provided in the drainage channel. A pavement material for drainage elastic pavement, characterized by connecting holes. 6. The pavement for drainable elastic pavement according to claim 2, wherein the arrangement density of the drain holes is changed depending on the location. Wood. 7. The pavement material for drainable elastic pavement according to any one of claims 2 to 6, wherein a spring constant is 3
A pavement material for drainable elastic pavement, which has a weight of 0 to 120 kgf / mm. 8. A drainage elastic pavement structure formed by adhering a plate-like pavement material formed of an elastic aggregate and a binder to a roadbed, wherein said pavement material is attached to said pavement material from its surface side. A drainage elastic pavement comprising a plurality of drainage holes penetrating to a contact surface side with a roadbed, a drainage groove provided in the surface of the roadbed, and at least two or more of the drainage holes connected to the drainage groove. Construction. 9. The drainage elastic pavement structure according to claim 8, wherein a cross-sectional area of the drainage hole is smaller on a contact surface side with the roadbed than on the surface side. Drainable elastic pavement structure. 10. The drainable elastic pavement structure according to claim 8, wherein the drainage hole has an irregular shape. 11. The drainage elastic pavement pavement according to any one of claims 8 to 10, wherein the arrangement density of the drain holes is changed depending on the location. Wood. 12. The drainable elastic pavement structure according to claim 8, wherein a spring constant of the paving material is 30 to 120 kgf / mm. .