JP2799609B2 - Pavement structure - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a pavement structure suitable as a road surface for a vehicle slip test, and particularly to various stable slip resistance values such as repetition reproducibility and identity of a slip resistance value. The present invention relates to a pavement structure which can be easily set by a conventional technique.

(Prior Art) "Slip" on a road pavement is an indispensable problem for a car to travel, and the existence of a slip road is indispensable in a test of a car, and a driver can slip even at a driving school. The number of places where paved roads are provided to make people experience is increasing. A stable pavement surface with a slip is desired, and a road surface for a vehicle test has to be set according to each purpose from a high slip resistance value to a low slip resistance value.

Conventionally, asphalt mixture-based, cement concrete-based, resin-based, and tile-based roads have been used as road surfaces for automobile slip test roads, and among them, asphalt mixture-based and cement concrete-based are often used. This is because large-scale construction can be performed, the construction period is short, and there are advantages of construction, economy, and serviceability such as running property similar to that of a general road can be obtained during operation. However, the exact slip resistance value of the road surface is not known until the end of construction, and if the target slip resistance value cannot be obtained, it will be troublesome immediately after construction, such as performing surface polishing, blasting, and even reconstructing There are many cases. Further, even if a desired slip resistance value is obtained at the beginning, there is also a problem that the slip resistance value changes over time due to service, such as aged, and remains after paving.

Relatively easy construction is performed on the resin-based road surface in the form of a thin layer and coating on the base surface, and the completed road surface has extremely low slip resistance. However, there are many problems related to weather resistance, such as surface changes due to aging and peeling from the base surface.

Another method is to lay tiles.
This is excellent in the quality of laying factory manufactured products and the uniformity of the finished road surface. However, since the tile itself is an imported product, there are restrictions in terms of economy and supply, and it takes time to grind the tile surface and remove the skin to prevent aging. In addition, this polishing creates corners at the edges,
If it is used frequently, that part will gradually wear out,
There is a problem after the service, such as the slip resistance value gradually decreasing with this, which may cause aging.

In any case, each method has advantages and disadvantages in quality, economy, workability, and serviceability, and at present, a method suitable for use conditions is selected.

Thus, it is desired that the target slip resistance value be easily and reliably designed and constructed on the road pavement surface.

(Problems to be Solved by the Invention) As a problem of the prior art on a slip test path for an automobile test, it is possible to design a target slip resistance value and set it on site, and to check slip after service. The resistance value does not change over time, the slippery road surface is damaged,
It is durable against climate and the like, and construction is easy. An object of the present invention is to provide a pavement structure satisfying these requirements.

(Means for Solving the Problem) The pavement structure of the present invention is formed by densely arranging a number of hard hemispherical structures having a smooth surface of 0.3 to 100 mm in diameter so that the distance between adjacent hemispherical structures is less than the diameter. This is a pavement structure disposed on the surface, and a desired road surface slip resistance value can be obtained by selecting a combination of a material, a dimensional shape, an arrangement interval, and the like of the hemispherical structure.

In the present invention, the hemispherical structure refers to a shape which is substantially hemispherical on a road surface, and its material is abrasion on a tire due to running of a wheel, deterioration due to weather conditions, etc. As long as it is durable and does not cause a change, for example, there is a fired tile, a steel plate, or the like in which a hemispherical structure and a base are integrated with the same material. In this case, for example, alumina ceramic balls, zirconia ceramic balls, glass balls, steel balls and the like are desirably used. It is also preferable to embed a material having a hemispherical upper part and a rod-like lower part in the substrate. The substrate at this time is also preferably a rigid one, and a steel plate, a cement concrete flat plate, a fired tile, or the like is used, and an epoxy resin or the like is preferably used as the adhesive. The surface of the hemispherical structure needs to be smooth as in the above-described example.
The degree depends on the intended slip resistance and the like, but usually, the friction coefficient (μ) of the surface is 0.5 or less.

The size of the hemispherical structure is 0.3 to 100 mm in diameter, preferably 5 to 100 mm.
If it is too small or too large, it is difficult to obtain a good sliding road surface.

It is desirable that the hemispherical structures are made of the same shape and the same material and are arranged at the same height in a regulated manner and as densely as possible. It is necessary that the distance between the nearest hemispherical structure is less than its diameter, preferably less than its radius. Exceeding the diameter makes it impossible to achieve its intended purpose.

In the present invention, the term “hemispherical” means a substantially hemispherical shape as described above, in other words, a spherical shape having a rounded shape and no corners as a whole. By arranging such hemispherical structures regularly and densely at the same height, it is possible to obtain a uniform slip resistance value and remarkable aging of the slip resistance value due to tire wear during automobile driving. Does not occur. In addition, a water pool is formed in the concave portion surrounded by the hemispherical structure, and necessary water required for the slip test can be stored, so that the hydroplaning phenomenon does not easily occur and a small amount of makeup water is required. Furthermore, if there is a depression (or flat portion) at the top, a stable slip resistance value can be obtained without impairing the drying of the top. It is preferable that the hemispherical structure regularly forms an equilateral triangle or an equilateral quadrilateral and is continuous in a plane to obtain a uniform and stable slip resistance value such as reproducibility and identity. For example, it is impossible for a vehicle wheel for a slip test to travel in the same place. For this reason, if the unevenness of the protrusions on the slippery road surface occurs, a different value is obtained for each measurement, and the evaluation of the measured value in consideration of the unevenness not only lacks the reliability of the measured value but also , Wastes time and money and is not economical. Therefore, this arrangement forms a so-called "non-directional" road surface that can obtain a reliable value without variation regardless of where the vehicle runs on the test road.

Further, the slip resistance value of the slip road surface can be easily set by changing the diameter, interval and material of the hemispherical structure. That is, it is possible to reproduce an object having the same slip resistance value as that of indoors outdoors. That is, a desired slip resistance value can be set outdoors, which means that a reliable slip resistance value can be repeatedly reproduced. Specifically, the relationship with the slip resistance value is previously grasped in the room based on the diameter, interval, material, and the like of the hemispherical structure, and the combination is set so that a desired slip resistance value is obtained. Then, a step of pavement installation of the road surface suitable for this is taken. FIG. 1, FIG. 2 and Table 2 are shown below as examples of laboratory data on this. FIG. 1 illustrates the relationship between the diameter and the coefficient of friction (μ value) using glass beads. From this figure, it can be seen that the friction coefficient increases as the diameter, that is, the diameter of the glass beads, increases, and that the friction coefficient also changes depending on the arrangement. Figure 2 shows the diameter
This is an example of the relationship between hemispherical object distance and wear coefficient using 10 mm glass beads. From this figure, it is understood that the friction coefficient increases as the distance increases. Table 2
4 is a table showing a relationship between a surface roughness of a hemispherical structure and a wear coefficient. From this table, it can be seen that the wear coefficient increases as the surface roughness increases.

In the construction of the pavement structure of the present invention, for example, an epoxy resin is applied as an adhesive layer to a flat plate and a hard substrate in which the projections for the hemispherical structure and the substrate are integrated with the same material, and the hemispherical structure can be formed. As a flat plate in which a material is embedded, there is a flat plate laying type method in which each flat plate is placed on a base which has been previously flattened. Also, apply a sufficient amount of adhesive, for example, epoxy resin, on the rigid base that has been flattened and finished, so that the material capable of forming a hemispherical structure will not adhere to the base without scattering. Method of embedding material material and method of arranging materials that can form a hemispherical structure on a substrate so that they do not move in the required shape, pouring a fluid material such as concrete mortar, epoxy resin from above, and fixing it There is. In the latter method, one unit of the projection to be embedded or to be installed is previously bonded in a required arrangement on a rigid flat plate with an adhesive or the like, and this is inverted and embedded in the base. preferable. In any of these methods, it is possible to supply a road surface having a slip resistance value as set as a target only by finishing the substrate at the construction target site flat.

(Effect) According to the present invention, it becomes possible to supply a road surface having a slip resistance value as set anywhere.

In addition, when laying these, it is possible to easily construct them using conventional techniques such as asphalt mixture, cement concrete, resin concrete, etc. By exchanging the parts, it is possible to provide a road surface with reproducibility and reliability, such as a slip resistance value similar to the present condition can be obtained.

Therefore, the present invention can set and install a stable slip resistance value such as repetition reproducibility and identity as a slip road surface for an automobile test, and furthermore, the construction thereof can be easily performed by the conventional technology, so that the present invention can be easily performed by a conventional method. sex,
Effective for reliability, durability and economy.

(Examples) Next, the present invention will be described based on examples.

Glass beads with different diameters (hereinafter referred to as protrusions)
From the measurement results in Fig. 3 obtained from the laboratory test, the conditions of the projection with the target friction coefficient of 0.1 were selected, and a flat plate having a flat and side configuration as shown in Fig. 4 was created. It was embedded and installed in the existing road surface that passed by. On this occasion,
The top of the protrusion was finished so as to be horizontal with the existing road surface.

After the completion of paving, when water was sprayed on this flat plate, water pools were formed in the depressions surrounded by the projections, but the tops of the projections were not covered with water, and no water film was formed on the surface. Was.

The surface was measured for slip resistance by changing the measurement angle according to the method described in ASTM E 303 (using a pendulum skid resistance tester), and the results shown in Table 1 were obtained.

From this result, it was confirmed that the same slip resistance value was obtained for traveling from any direction. In addition, the friction coefficient of this surface was measured with an actual measurement vehicle, and the same friction coefficient as the set value of 0.1 was obtained. In this measurement, watering was performed just before the start of the test.
Watering has not been performed continuously or intermittently as in the prior art.

From this, the hydroplaning phenomenon does not occur,
A non-directional slip surface was obtained.

Furthermore, it was confirmed that even if the flat block was clogged with dust, dust could be easily removed by spraying water, and the initial slip resistance was maintained.

Next, Table 2 shows the coefficient of friction with the smooth surface (difference in unevenness) of the surface of each hemispherical material.

All of the above showed satisfactory results.

[Brief description of the drawings]

FIG. 1 shows the relationship between the diameter of the glass beads and the coefficient of friction (μ),
FIG. 2 is a diagram showing the relationship between the distance and the friction coefficient (μ) using glass beads, FIG. 3 is a diagram showing the relationship between the diameter of the zirconia ceramics and the friction coefficient (μ), and FIG. 4 is zirconia. It is a figure (A is a sectional view, B is a top view) showing an example in which ceramics were arranged.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E01C 9/00 E01C 5/22

Claims (6)

(57) [Claims] 1. A pavement structure in which a number of hard hemispherical structures having a smooth surface having a diameter of 0.3 to 100 mm are densely arranged on the surface such that the distance between adjacent hemispherical structures is equal to or less than the diameter. 2. The pavement structure according to claim 1, wherein the hemispherical structure is formed by a spherical body. 3. The pavement structure according to claim 1, wherein hemispherical structures having substantially the same shape and material are regularly and continuously arranged. 4. The pavement structure according to claim 3, wherein the regular arrangement is a repetition of a regular square or a regular triangle. 5. The pavement structure according to claim 1, wherein an interval between adjacent hemispherical structures is equal to or less than a radius thereof. 6. The method of claim 1, wherein the hemispherical structure has a depression at the top.
The pavement structure according to any one of claims 4 to 4.