JPH0526087Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a road surface quality measuring vehicle for measuring the amount of unevenness in the longitudinal direction of a road surface for the purpose of understanding the road surface properties necessary for the maintenance and management of paved road surfaces.

Currently, in order to maintain and manage road surfaces, the crack rate,
We actually measure three road surface characteristics: the amount of longitudinal unevenness and the amount of ruts, and calculate the Pavement Serviceability Index (PSI) and Maintenance Management Index (MCI), and use these to determine the maintenance and repair of the road surface.

As a measuring device for measuring the amount of unevenness in the longitudinal direction, a direct unevenness measuring device (3 m ruler with feet), a profilometer (there are 3 m and 8 m distance between fulcrums), etc. are used. A profilometer has wheels attached to the feet of a ruler with feet.
Alternatively, there are devices that use this as a fulcrum and support the fulcrum with a large number of wheels. There is a measurement wheel in the center of both fulcrums that can be moved up and down, the locus of the center of the straight line connecting the fulcrums is used as the measurement reference line, and the displacement of the measurement wheel is read as the wave height from the reference line.

The conventional method uses a contact method to measure the distance from a ruler to the road surface to measure the amount of longitudinal unevenness, and is suitable for measuring while stopped.
It takes time and effort. Even if it is towed by a vehicle and measurements are taken while it is running, it is necessary to slow down the running speed. If the traveling speed is increased, the measuring vehicle is susceptible to shocks and vibrations caused by uneven road surfaces, protrusions, etc., and there is a drawback that accurate measurements cannot be made.

The present invention improves these drawbacks and provides a road surface condition measuring vehicle that can automatically measure the amount of unevenness in the longitudinal direction of the road surface while the vehicle is running in a non-contact manner.

The present invention provides a vehicle with a travel measuring device for the vehicle, a transmitter that interlocks with the measured travel distance, and a vibration meter that measures the amount of vibration amplitude when the vehicle is traveling. Three position sensors are installed at intervals in the longitudinal direction of the vehicle to non-contactly measure the distance to the vehicle. Input the amount of vibration amplitude and the distance to the road surface measured by each position sensor, and connect the distances to the road surface measured by the position sensors located before and after the input as a base point. The line is used as a reference line for measurement, and the displacement of the distance to the road surface measured by a position sensor located in the middle with respect to the reference line for measurement is calculated as the actual value of the amount of unevenness in the longitudinal direction of the road surface. A controller is provided which can calculate a calculated value of the amount of unevenness in the longitudinal direction on a road surface by subtracting the amplitude of vibration during running of the vehicle from the measured value of the amount of unevenness in the longitudinal direction on the road surface. The gist of the present invention is a structure of a road surface condition measuring vehicle characterized by being further provided with a recorder for recording calculated data.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a layout diagram showing one embodiment of the road surface quality measuring vehicle of the present invention, and FIG. 2 is an example of a system diagram for measuring and recording the amount of unevenness in the longitudinal direction of the road surface.

In the figure, reference numeral 1 denotes a self-propelled vehicle, which may be configured as a dedicated vehicle as shown in FIG. 1, or may be a general-purpose vehicle such as a van or a microbus. Further, the towing vehicle may be equipped with instruments, measuring devices, etc., and the vehicle may be towed by another vehicle. 2 is a distance measuring wheel,
An air cylinder or the like is provided separately from the vehicle and is in constant contact with the road surface at a constant pressure. Reference numeral 3 denotes a trip meter, which is attached to the distance measuring wheel 2 and together with the distance measuring wheel 2 forms a traveling distance measuring device. 4 is a transmitter, which is linked with the trip meter 3 of the mileage measuring device;
It oscillates a pulse signal every fixed travel distance. It is also possible to use the rear wheel of a wheel as the distance measuring wheel 2, and to use a photoelectric measuring roller detector or the like as a transmitter of the distance measuring device. Reference numeral 5 denotes a position sensor, which is arranged vertically on the self-propelled vehicle 1 in a row at equal intervals, for example, at intervals of 1.5 m.
There are several. That is, as shown in Figure 1,
One position sensor 5 is located at the front position of the self-propelled vehicle 1, another position sensor 5 is located at the rear position of the self-propelled vehicle 1, and another position sensor 5 is located at the rear position of the self-propelled vehicle 1.
is placed at an intermediate position between them. The position sensor 5 may be of any type such as a laser type, an ultrasonic type, or a microwave type. Taking the laser method as an example, the sensor 5 is equipped with a laser beam generating section and a light receiving section. The light emitting part and the light receiving part of the position sensor 5 are both installed facing the road surface. Then, a laser beam is emitted from the light projector toward the road surface, and the reflected light is captured by the light receiver to measure the distance between the position sensor 5 and the road surface. Reference numeral 6 denotes a controller, which has arithmetic functions, digital/analog or analog/digital conversion functions, and the like. By inputting the data measured by the position sensors 5, it is possible to calculate the distance between each position sensor 5 and the road surface and the actual measured value of the amount of unevenness in the longitudinal direction of the road surface. 7
is a vibration meter that includes a sensor (pickup), an amplification section, a display power supply section, etc., and measures the amount of vibration amplitude when the self-propelled vehicle 1 is running. The amplitude of vibration measured by the vibration meter 7 when the vehicle 1 is running is also input to the controller 6, and the controller 6 calculates the amount of vibration when the vehicle is running based on the actual measured value of the amount of unevenness in the longitudinal direction of the road surface. By subtracting the amplitude of vibration in , the amount of unevenness in the longitudinal direction on the true road surface is calculated as a calculated value. Reference numeral 8 denotes a recorder, which simultaneously or selectively records the amount of data input to the controller 6 and further calculated. It is also possible to record on magnetic tape or disk,
It is also possible to illustrate with a plotter.

As shown in FIGS. 1 and 2, the pulse signal from the transmitter 4, the data from the vibration meter 7, and the data from the position sensor 5 are input to the controller 6, and these data are input to the controller 6. The calculated data or the data itself can be input to the recorder 8.

In addition, a generator or a battery is used as a power source for these measuring instruments, and electricity is supplied to each measuring instrument through a transformer, a voltage/current stabilizing device, etc.

This road surface quality measuring vehicle measures the amount of unevenness in the longitudinal direction of the road surface in the following manner.

Out of the three position sensors 5, two position sensors 5 located on both the front and rear sides measure the distance to the road surface, connect these to form a reference line for measurement, and measure the distance to the road surface from the position sensor 5 located in the center. is measured, and the displacement (wave height) of this value from the measurement reference line is calculated by the controller 6 as an actual value of the amount of unevenness in the longitudinal direction on the road surface. The controller 6 calculates by subtracting the amount of vibration amplitude when the vehicle is running, which is measured by the vibration meter 7, from the measured value of the amount of unevenness in the longitudinal direction on this road surface. The amount of unevenness in the longitudinal direction is calculated as a calculated value. The recorder 8 can simultaneously and selectively record the measured value of the amount of unevenness in the longitudinal direction on the road surface, the amount of vibration amplitude when the vehicle is running, the calculated value of the amount of unevenness in the longitudinal direction on the true road surface, etc. can. Recording can be done on magnetic tape, tape, etc., or on an XY plotter.

The data recorded by the recorder 8 can be input into a computer such as a personal computer and analyzed easily, and the necessary information can be input to the day play, XY
It can be displayed and recorded using a plotter, printer, etc. If these are installed on a vehicle and connected to a recorder, it is also possible to process these data consistently.

The road surface quality measuring vehicle of the present invention uses a non-contact method to measure and calculate the actual measured value of the amount of unevenness in the longitudinal direction on the road surface, and from the actual measured value of the amount of unevenness in the longitudinal direction, By calculating by the controller to subtract the amplitude of vibration, the amount of unevenness in the longitudinal direction on the true road surface, which has been removed from the influence of vibrations caused by the running of the measuring vehicle, can be continuously determined while the vehicle is running. Moreover, since the measurement is quick and highly accurate, time, labor, cost, etc. can be significantly saved. Furthermore, since the measuring method is a non-contact method, the measuring device has practical benefits such as being advantageous in terms of durability.

[Brief explanation of drawings]

FIG. 1 is a layout diagram showing one embodiment of a road surface quality measuring vehicle of the present invention, and FIG. 2 is a diagram showing an example of a system diagram for measuring and recording the amount of unevenness in the longitudinal direction of a road surface. In the figure, 1... self-propelled vehicle, 2... distance measuring wheel, 3... trip meter, 4... transmitter, 5
...Position sensor, 6...Controller, 7...
A vibration meter, and 8...a recorder.

Claims (1)

[Scope of utility model registration request] The vehicle is equipped with a distance measuring device for the vehicle, a transmitter that is linked to the measured distance, and a vibration meter that measures the amplitude of vibration when the vehicle is running, and the distance to the road surface is not measured. Three position sensors for contact measurement are arranged at intervals in the longitudinal direction of the vehicle, and the pulse signal from the oscillator, the amplitude of vibration when the vehicle is running measured by the vibration meter, and each Input the distances to the road surface measured by the position sensors, and create a measurement reference line by connecting the distances to the road surface measured by the position sensors located before and after the input. Then, the displacement of the distance to the road surface measured by a position sensor located in the middle with respect to the measurement reference line is calculated as the actual measured value of the amount of unevenness in the longitudinal direction on the road surface, and further, the unevenness in the longitudinal direction on the road surface is A controller is provided that can calculate the measured value of the amount of unevenness in the longitudinal direction of the road surface by subtracting the amount of vibration amplitude when the vehicle is running from the actual measured value of the amount. A road surface condition measuring vehicle characterized by being equipped with a recorder for recording data.