JPS6354087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring device for measuring road surface conditions such as rutting and longitudinal unevenness.

Road surfaces, whether concrete pavement or asphalt pavement, generally develop unevenness such as ruts due to long-term use. For this purpose, the condition of the road surface is measured, and if the condition deteriorates beyond a predetermined level, it is repaired.

Conventionally, a profile meter disclosed in Japanese Patent Publication No. 53-11375 has been known as a device for measuring road surfaces for the above-mentioned purpose. However, this method requires time-consuming measurements by crossing the road, which requires traffic stops, which is very inconvenient.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a road surface condition measuring device that can accurately measure the condition of a road surface without making a traffic stop or the like.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A measuring device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

The mounting device shown in FIG. 1 is suitable for measuring ruts and is installed at the rear of a vehicle 5.

In the figure, reference numeral 6 indicates a support frame protruding from the rear surface of the vehicle 5, and a universal joint 3 and a Gyro-Scope are mounted at the tip of the support frame.
The beam body 2 is attached via the. This beam body 2 extends almost horizontally in the width direction of the vehicle, and as shown in FIG.
2) light sources 2' are supported at equal intervals y from each other.
These light sources 2' are inclined in the same direction as the width direction of the road surfaces G and L so as to emit a straight beam γ at a predetermined angle θ ₁ . In the figure, reference numeral 4 indicates a photoreceptor 4 supported on a vehicle 5 via a support frame 7, which is composed of a video sensor, an image sensor, or a camera, and which directs the irradiation points γ ₁ and γ ₂ of the linear beam γ. They are located above the road surface in correspondence with the respective light sources 2' so as to be detected from reflected light.

The devices shown in FIGS. 2 and 3 are suitable for measuring the condition of a road surface in the running direction, such as longitudinal unevenness, and the beam body 2 extends along the longitudinal direction of the vehicle 5. The light sources arranged at a predetermined interval from each other in the longitudinal direction of the beam body 2 are
It is set to emit a straight beam at a predetermined angle in the traveling direction of the road surfaces G and L. In addition, the photoreceptor 4
A processing means for performing the following calculations is connected to the output side of .

The basic principle of measuring the condition of a road surface using the apparatus configured as described above will be explained with reference to FIG.

In the figure, L ₁ is the distance between the photoreceptor 4 and the road surface G/L, and L ₂ is the horizontal projection point of the photoreceptor 4 and the distance between the photoreceptor 4 and the road surface G/L.
horizontal distance from the vertical line, S is the apparent displacement of the projected point of the moving plane, x+s is the true displacement, and H
is the moving height with respect to the horizontal virtual road surface G/L.

If the moving height H is calculated using the factors mentioned above, it will be as follows.

H _/ x+ _S = _{tanθ 1 ... x} /H _{= tanθ 2} /L ₁ )+S=tanθ ₁ H=(HL ₂ +S/L ₁ )×tanθ ₁ +Stanθ ₁ H(1−L ₂ +S/L ₁ ×tanθ ₁ )=Stanθ ₁ H=Stanθ ₁ /1−L ₂ +S /L ₁ tanθ ₁ = SL ₁ /L ₁ /tanθ ₁ −L ₂ −S From the above formula, the height difference H is determined by the apparent movement amount S, the illumination angle θ, and the distance from the road surface of the photoreceptor 4, which can be set in advance. It can be calculated from the distance L ₁ of , and the distance L ₂ of the projection point. Therefore, by plotting the height difference H obtained from each photoreceptor 4, the rut can be shown as a plurality of points, and by approximately processing these points and connecting them continuously, Ruts at one location on the road surface can be measured as a cross section. Therefore, by repeating the above measurements while the vehicle is running, it is possible to determine the presence of ruts on the road surface in the running direction as well.

In addition, in the apparatus shown in FIGS. 2 and 3,
By performing the above analysis, the longitudinal unevenness of the road surface can be measured.

If similar devices are placed on both sides of the device of the embodiment shown in FIG. 1 above, as shown in FIG. Can be measured.

The road surface measuring device of the present invention includes a plurality of light sources that are attached to a vehicle and arranged at predetermined intervals from each other and emit light beams at a predetermined angle onto the road surface; Since the height of the road surface is measured using known factors between these light sources and the photoreceptor, this measurement can be performed while the vehicle is running. . As a result,
There is no need to block vehicles. Furthermore, by increasing the number of light sources and photoreceptors, more accurate measurement becomes possible.

[Brief explanation of drawings]

1 to 3 are diagrams for explaining different embodiments of this invention, FIG. 4 is a diagram for explaining the measurement principle of this invention, and FIG.
It is a figure for explaining the modification of the apparatus shown in a figure. 2'...Light source, 4...Photoreceptor, 5...Vehicle.

Claims (1)

[Scope of Claims] 1. A plurality of light sources that are attached to a vehicle and arranged at predetermined intervals from each other and emit light beams onto a road surface at a predetermined angle; 1. A road surface condition measuring device, comprising: a photoreceptor for measuring a point, and measures the height of the road surface based on the arrangement relationship between the light source and the photoreceptor. 2. A plurality of light sources that are installed on a vehicle and arranged approximately horizontally at a predetermined distance from each other and emit light beams onto the road surface at a predetermined angle, and a plurality of light sources that are installed on the vehicle so as to be located at a certain height above the road surface. a photoreceptor for measuring the point of irradiation of the light beam on the road surface; a means for determining the apparent amount of movement of the irradiation point based on information from the photoreceptor; 1. A road surface condition measuring device comprising means for detecting a difference in height of a road surface based on the distance from the road surface and the height of the photoreceptor from the road surface.