JPH11280019A - Paving material for water draining elastic pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paving material for water draining elastic pavement having high bonding force on a roadbed and excellent water draining property of water sank into the inside thereof when it rains. SOLUTION: A paving material 10 is a flat plate having a thickness of 20 to 50 mm and is hardened and formed by mixing urethane binder with rubber chip aggregate and compressing and molding them for heat treatment. A cut-in part 11 is provided orthogonally for the direction of advance of a vehicle on a surface side 10a of the paving material 10. Consequently, even if water is collected on a surface of the paving material 10 when it rains, the cut-in part is opened due to running of the vehicle so that water penetrates into the inside of the cut-in part. As a result, it is possible to prevent the reduction of friction coefficient of a road surface at the time of braking and suppress the hydroplaning phenomenon. Moreover, the water draining performance of the paving material can be improved without increasing a cavity rate thereof so that the strength of the paving material and the bonding strength on a roadbed are not reduced.

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.

[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 providing a porosity of several tens of percent during molding, high water permeability can be obtained, and sound of a specific frequency transmitted from a vehicle can be absorbed by such a void, so that traffic noise can be significantly reduced. Has excellent properties.

[0003]

However, when the above-mentioned pavement material is used for a general road, the water inside the pavement material is not completely drained at the time of rain or the like. There has been a problem that the warp and water emerge around the wheels to reduce the friction coefficient of the road surface during braking. Furthermore, it is necessary to have a high adhesive strength to the roadbed.However, with conventional pavement materials, since the water inside the pavement material is not completely drained, the adhesion between the roadbed and the Reliability could not be secured. On the other hand, 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.

[0004] Further, by increasing the porosity of the pavement material to several tens of percent, the rigidity of the pavement material is reduced, so that the sinking of the wheels of the traveling vehicle into the pavement material is increased, and as a result, There is a problem that steering stability 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. Due to the above-described problems, the drainable elastic pavement material has not been widely used for paving general motorways or expressways. The present invention is intended to solve the above-described problem, and has an object to provide a pavement material for drainage elastic pavement having excellent drainage of water permeated into the interior during rainfall and the like, and having high adhesion to a roadbed. Aim.

[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 the first aspect is characterized in that a material obtained by mixing a binder with an elastic aggregate is molded. A pavement material formed and adhered to a roadbed to form a drainable elastic pavement, wherein a notch is provided on a surface side thereof. Here, the cut is
In addition to the groove shape, a hole shape is also included.

[0006] In the invention according to claim 1 configured as described above, by providing a cut in the surface of the pavement material,
Even if water accumulates on the road surface during rainfall, the notch opens when the vehicle is running, so that water permeates into the notch. as a result,
During braking, a reduction in the friction coefficient of the road surface can be prevented, and the hydroplaning phenomenon can be suppressed. In addition, since the drainage performance can be improved without increasing the porosity of the pavement material, it is possible to suppress a decrease in the strength of the pavement material and the adhesive strength with the roadbed.

According to a second aspect of the present invention, in the pavement material for drainable elastic pavement according to the first aspect, the cut is formed at right angles to a vehicle traveling direction on a road. Is to be. In the invention according to claim 2 configured as described above, in addition to the effect of the invention of claim 1, the cut of the pavement material is formed at right angles to the traveling direction of the vehicle, so that the cut of the cut is resistant. Thus, the braking distance of the vehicle can be shortened. That is, the same effect as when the friction coefficient of the surface of the pavement material is substantially increased can be obtained.

According to a third aspect of the present invention, in the pavement material for drainable elastic pavement according to the first aspect, the cuts are inclined at a predetermined angle with respect to the vehicle traveling direction. That is, both wheels of the vehicle are arranged so as not to step on the cuts at the same time. In the invention according to claim 3 configured as described above, in addition to the effect of the invention of claim 1, by providing the cut of the pavement material at a predetermined angle with respect to the traveling direction in the vehicle, Since the left and right wheels of the vehicle do not step on the cut at the same time, it is possible to reduce the generation of noise when the cut passes.

[0009] The structural feature of the invention according to claim 4 is that in the pavement material for drainable elastic pavement according to any one of claims 1 to 3, the pitch of the cuts is set as follows.
It has been made different depending on the location in the vehicle traveling direction. In the invention according to claim 4 configured as described above, in addition to the effects of the inventions of claims 1, 2, and 3, the pitch of the cut is set at a place where the vehicle needs to be braked, such as near an intersection or a sharp curve. The pavement material can be adjusted densely and the pitch can be adjusted coarsely in other places, and the appropriate function of the paving material can be exhibited in each place.

According to a fifth aspect of the present invention, there is provided a pavement material for drainable elastic pavement according to any one of the first to fourth aspects, wherein a cut is made on a road surface in a vehicle traveling direction. Is set to 90 ° or less. In the invention according to claim 5 configured as described above, in addition to the effects of the inventions of claims 1, 2, 3, and 4, when the wheel steps on the notch, the notch opens and the obstacle to the wheel occurs. Therefore, the frictional resistance of the road surface during braking can be increased.

According to a sixth aspect of the present invention, there is provided the pavement material for drainable elastic pavement according to any one of the second to fifth aspects, wherein the spring constant is from 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 6 configured as described above, in addition to the effects of the inventions of claims 2 to 5, the sinking of the wheels can be reduced, and good noise absorption and drainage can be obtained. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a drainage adhesive bonded to a roadbed of a road for driving a car. FIG. 1 is a perspective view showing a pavement material for elastic pavement (hereinafter, referred to as a pavement material). The pavement material 10 has a thickness of 20 to 50 mm.
Of rubber chip aggregate (spindle type, mesh type, rough type, cloth type etc.)
A urethane-based binder is mixed and compression-molded at 150 ° C.
It is cured and formed by performing a heat treatment for 10 minutes. And the spring constant of the paving material 10 is 30 to 120 kgf /
mm, but more preferably 40 to 100 kg
f / mm. The amount of the binder and the porosity are not particularly limited, but the binder is preferably 5 parts by weight or more based on 100 parts by weight of the rubber chip, and the porosity is preferably in the range of 20 to 40%. For example,
When the rubber chip is 100 parts by weight, the binder amount is 5 to 5.
FIG. 3 shows the result of measuring the spring constant using a sample having a porosity of 20 to 40% by weight and a porosity of 20 to 40%.

For measuring the spring constant E, 100 mm
φ × 30 mm measurement sample (area S = 78.5 cm
² ) is prepared, a load P is applied thereto, and the deformation amount (corresponding to the sinking amount of the wheel) t at that time is measured.

[0014]

## 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.

As shown in FIG. 1, a notch 11 having a width of 1 mm and a depth of 5 mm is formed on the surface 10a of the pavement material 10 as shown in FIG.
Are provided at right angles to the traveling direction of the vehicle (the direction of the arrow in the figure). This paving material 10 is, as shown in FIG.
It is fixed to the concrete or asphalt roadbed 13 provided on the ground 14 by bonding using an epoxy-based adhesive or a urethane-based adhesive 12, thereby forming a drainage elastic pavement structure.

The pavement material 10 constructed as described above has a cut 11 at its surface 10a at right angles to the traveling direction of the vehicle. As a result, the cut 11 is opened, so that water permeates into the cut 11. As a result, a decrease in the coefficient of friction of the road surface during braking can be prevented, and the hydroplaning phenomenon can be suppressed. In addition, since the drainage performance can be improved without increasing the porosity of the pavement material 10, a decrease in the strength of the pavement material 10 and the bonding strength with the roadbed 13 can be suppressed.

Further, the paving material 10 has a spring constant of 30 to
Since it is set to an appropriate value within the range of 120 kgf / mm, sinking of, for example, wheels of a 10-ton truck into the pavement material 10 can be reduced to about 1.6 to 6.5 mm, and the steering stability of the vehicle is maintained satisfactorily. it can. Also, the porosity is 20 to
Since it is within the range of 40%, good noise absorption can be obtained.

Next, a second embodiment will be described. In this embodiment, as shown in FIG. 4, the pavement material 20 has the cut 21 in the vehicle traveling direction of the road (the direction of the arrow).
Is inclined at a predetermined angle θ of 90 ° or less. For this reason, it is possible to prevent a decrease in the coefficient of friction of the road surface during braking during rainfall or the like, and to reduce noise generation at the time of passing the cut because the left and right wheels of the vehicle do not step on the cut 21 at the same time. Further, since the cut 21 is inclined in the traveling direction of the vehicle, the water collected in the cut 21 can be efficiently discharged to the road shoulder side.

Next, a third embodiment will be described. In this embodiment, as shown in FIG. 5, the pavement material 30 has a predetermined angle of not more than 90 ° with respect to the road surface in the traveling direction (arrow direction) of the vehicle, as shown in FIG. That is, it is inclined at the angle ω.
Therefore, when the notch 31 is opened when the wheel steps on the notch 31, the resistance against the wheel is increased, so that the frictional resistance of the road surface 30 a during braking can be increased.

In each of the above embodiments, the pitch of the cut can be varied depending on the location in the vehicle traveling direction. For example, it can be adjusted so that the pitch of the cut is made dense at a place where the vehicle needs to be braked, such as near an intersection or a sharp curve, and the pitch is made coarse at other places. Thereby, at the time of rain, etc., near the intersection or the like, the cuts are densely provided, so that the reduction of the frictional resistance of the road surface can be accurately prevented, and the frictional resistance is small in other parts that do not require braking. Therefore, the proper function of the paving material can be exhibited for each place without hindering proper running during normal running.

Further, the shape of the cut is not limited to that shown in each of the above embodiments, and for example, FIG.
As shown in (c), there are a zigzag shape extending in the traveling direction, a zigzag shape parallel to the traveling direction, and a vehicle provided partially instead of the entire vehicle width. In addition, it may be a curved cut. Further, the cut is not limited to the groove, but may be a hole having a predetermined depth.

In the first to third embodiments, the spring constant of the paving material is not necessarily 30 to 120 kg.
It need not be in the range of f / 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. The drainage elastic pavement structure is used not only for roads but also for fields on 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 a drainage elastic pavement structure using the same pavement 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 perspective view showing a pavement material according to a second embodiment.

FIG. 5 is a perspective view showing a pavement material according to a third embodiment.

FIG. 6 is a perspective view showing a pavement material according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Paving material, 11 ... Cut, 12 ... Adhesive, 13 ... Roadbed, 14 ... Drainage groove, 20 ... Paving material, 21, 22, 23 ...
Incision, 30 ... paving material, 31 ... incision, 32 ... drainage channel,
40: Paving material, 41: Notch.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaaki Hamada 3600, Gezu, Kita-gaiyama, Komaki-shi, Aichi Prefecture Inside Tokai Rubber Industries Co., Ltd. Address Tokai Rubber Industries Co., Ltd.

Claims (6)

[Claims] 1. A pavement material formed by molding a material in which a binder is mixed with an elastic aggregate, which is adhered to a roadbed of a road to form a drainable elastic pavement, wherein a cut is provided on a surface side thereof. A pavement material for drainage elastic pavement, which is characterized in that: 2. The pavement material for drainable elastic pavement according to claim 1, wherein the cut is formed at a right angle to a vehicle traveling direction on a road. . 3. The pavement material for drainable elastic pavement according to claim 1, wherein the cut is inclined at a predetermined angle with respect to a vehicle traveling direction so that both wheels of the vehicle do not step on the cut at the same time. A pavement material for drainage elastic pavement, which is disposed. 4. The drainage elastic pavement material according to claim 1, wherein a pitch of the cut is varied depending on a location in a vehicle traveling direction. Paving material for elastic pavement. 5. The drainage elastic pavement paving material according to claim 1, wherein an angle of the cut with respect to a road surface in a vehicle traveling direction is set to 90 ° or less. Characteristic pavement material for drainage elastic pavement. 6. The pavement material for drainage elastic pavement according to claim 1, wherein the spring constant is 3
A pavement material for drainable elastic pavement, which has a weight of 0 to 120 kgf / mm.