JPH0310044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple road surface condition measuring device that can easily and accurately measure the road surface condition of a paved road, particularly the longitudinal flatness of the road surface.

Japan's roads have been steadily improved through past efforts, and the rate of paved roads has also improved.
Although these pavements have served their mission well for many years, in recent years they have become less usable.
The current situation is that the proportion of maintenance and repair work is increasing. Maintenance and repair is important not only to ensure the serviceability of pavements, but also from the viewpoints of pavement durability and economic efficiency, and it is necessary to carry out maintenance and repairs as soon as possible before pavements become extremely damaged or deteriorate. In order to perform maintenance and repair, it is necessary to properly understand the road surface condition.

As a standard for maintaining and repairing pavement, the method based on the ``Road Maintenance and Repair Guidelines'' published by the Japan Road Association is currently the most standard method used by maintenance and repair personnel. This method actually measures three road surface characteristics: cracking rate, rut depth, and standard deviation of vertical unevenness, calculates the pavement service index PSI based on this, and then uses the PSI value to determine the road surface performance index. It determines the guidelines for repair methods, and has the drawback of requiring enormous costs and the mobilization of human resources for its investigation.

The present invention improves the conventional method for measuring the amount of longitudinal unevenness to determine the standard deviation of the amount of longitudinal unevenness, and provides a new measuring device that can easily, quickly and accurately determine the standard deviation of the amount of longitudinal unevenness. It is something to do.

The conventional method for measuring longitudinal unevenness and corrugation is to measure at 1.5 m intervals using a direct reading type unevenness measuring device with feet (3 m ruler with feet) or a 3 m or 8 m profilometer.
First, divide all measured values into a certain number of groups of 6 to 10 from the beginning, calculate the difference between the maximum value and minimum value of each group, that is, the range R, and then calculate the range R of all groups. The average value of is calculated, and the standard deviation σ is determined using the following formula: σ=/C. In this equation, C is a constant depending on the number of measurements in the group. This method measures at 1.5m intervals, so
This method requires manpower, may obstruct traffic during measurement, and is also dangerous due to traffic during measurement. Furthermore, the profilometer was moved continuously, and the amount of unevenness was recorded as a continuous wave on a chart for the distance it was moved, and 1.5 m from the chart was measured.
There is also a method of determining the amount of unevenness for each measurement point and calculating σ as described above. However, this method also requires a great deal of effort.

The present invention improves the conventional measuring method, and provides a measuring device that does not require manpower, saves labor, and can perform measurements quickly and accurately. The measuring device of the present invention is used to measure unevenness while driving, and the amount of unevenness is measured by measuring the maximum, minimum, and maximum values of the amount of unevenness during a certain traveling distance (for example, a distance corresponding to the above group). The difference between the minimum value and the minimum value, that is, the range R, can be recorded. The standard deviation of the amount of unevenness can be easily determined by digitizing the measured values by the measuring device of the present invention and using a personal computer or the like. It is also easy to automate these processes.

The road surface condition measuring device of the present invention is a road surface condition measuring device consisting of a vehicle and a towable longitudinal profilometer connected to the rear of the vehicle. A distance measuring device and a transmitter linked to the distance traveled are provided, and the signal from the transmitter emitted every fixed distance traveled by the profilometer is sent to the recorder to advance the chart of the recorder, and the unevenness during the fixed distance traveled is measured. The gist of this device is a simple road surface condition measuring device that is capable of capturing the amount of unevenness as an integrated wave and recording the maximum value, minimum value, and range of the difference between the maximum and minimum values of the amount of unevenness. .

Next, a simple road surface quality measuring device according to the present invention will be explained with reference to illustrated embodiments. FIG. 1 is a schematic diagram showing a side view of one embodiment of the simple road surface quality measuring device of the present invention. Further, FIG. 2 shows a system diagram from the unevenness measuring wheel and the distance measuring wheel of the embodiment shown in FIG. 1 to the recorder.

In the figure, reference numeral 1 is a self-propelled vehicle, which may be configured as a dedicated vehicle or may be a commonly used vehicle such as a light van. Reference numeral 2 is a towable longitudinal profilometer, and four wheels are attached to the front and rear of the ruler. This profilometer 2 is connected to the rear of the self-propelled vehicle 1. Reference numeral 3 denotes an unevenness measuring ring, which is provided at the lower center of the ruler of the profilometer 2. Reference numeral 4 denotes a vertical motion sensor, which senses the vertical motion of the unevenness measurement wheel 3. Reference numeral 5 denotes a travel distance measuring wheel, which is provided on the profilometer 2 separately from the wheels of the profilometer 2, and is provided with an air cylinder or the like so that it always contacts the road surface with a constant pressure. Reference numeral 6 denotes a transmitter, which is attached to the mileage measuring wheel 5 and emits a pulse signal every time the mileage measuring wheel 5 travels a certain distance. Reference numeral 7 denotes a recorder, which automatically records the amount detected by the vertical motion sensor 4 as the amount of unevenness via a converter 8, and displays it graphically or digitally.

A pulse signal emitted from the transmitter 6 every fixed travel distance is sent to the recorder 7 via the converter 8, and the chart on the recorder 7 is made to advance by a fixed length in an instant by the pulse signal.

FIG. 3 shows an example of the waveform of the amount of measured unevenness that appears on a chart when the flatness of a road surface is measured using the simple road surface quality measuring device of the present invention. for example,
To measure the flatness of a road surface using the simple road surface condition measuring device of the present invention, a pulse signal from a transmitter is sent every time the chart travels a certain distance (for example, 15 m) so that the chart moves a certain distance in an instant. do. By doing this, the initial accumulated wave has a distance of 15 m from the measuring point 0 m.
The amount of unevenness for 15 m up to m is accumulated and recorded on a line. When the profilometer travels 15m, the pulse signal causes the chart to instantly advance by the same length, and the next accumulated wave records the amount of unevenness over the 15m period from measurement point 15m to 30m accumulated on a line. In this way, the amount of unevenness in that section is accumulated and recorded at 15 m intervals. Therefore, each 15
The maximum value, the minimum value, and the difference between the maximum value and the minimum value of the amount of unevenness of m, that is, the range R can be directly read from the chart. Therefore, when using the measuring device of the present invention, compared to the conventional standard method, the number of measuring personnel and labor can be significantly reduced.

Then, the standard deviation σ of the analyzed longitudinal unevenness amount is
is precisely calculated using the following formula, just like the standard method.

σ=/C where σ: Standard deviation of longitudinal unevenness (mm): (Maximum value - Minimum value) = Average value of range (R) C: Constant determined by the measured value within the group Simplified version of the present invention Road surface condition measuring machines can measure continuously while driving, so they do not require human labor and are extremely efficient. As long as the traveling speed of the simple road surface condition measuring device of the present invention during measurement is approximately 20 km/h or less, results similar to those obtained by the standard method can be obtained.

The measurement of road surface flatness using the simple road surface quality measuring device of the present invention is carried out by providing one measuring line for each lane. The survey line is taken continuously from the start point to the end point of the section, parallel to the center line at around 80 to 100 cm inward from the lane edge, so that the profilometer, a simple road surface condition measuring device, runs on the survey line. Then, determine the measurement interval and set the transmitter to emit a signal every certain distance traveled (measurement interval) using the converter.
The chart on the recorder is wound forward for each distance traveled. After preparing in this manner, the amount of unevenness is continuously recorded on the chart of the recorder as an integrated wave of the amount of unevenness at each fixed traveling distance (measurement interval) while driving the road surface condition measuring device at a uniform speed. After completing the measurement of the measurement section, read the maximum value, minimum value, and range R of the amount of unevenness from the chart on the recorder.
The average value of R in the measurement interval is determined, and the standard deviation σ is determined from σ=/C.

These calculations can be made in a short time using a computer or the like.

The simple road surface condition measuring device of the present invention has the practical benefit of being able to automatically and easily record the unevenness of the road surface in the measurement section of the route while driving. Furthermore, the chart of the recorder in the measuring device of the present invention is made to advance a certain length by a pulse signal from a transmitter provided on the mileage measuring wheel every time the profilometer travels a certain distance, as shown in Fig. 3. The maximum amount of unevenness within a certain mileage section,
Since the minimum value and the difference between the maximum value and the minimum value, that is, the range R, can be easily read directly from the chart, there is no need to integrate it as in conventional methods, making analysis of road surface conditions extremely easy, and reducing chart consumption. It has practical benefits that can be minimized.

For this reason, if the simple road surface condition measuring device of the present invention is used, a small number of surveyors can perform the survey efficiently, economically, and competently, so they can conduct road surface surveys over a wide area. It can be made possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing one embodiment of the simple road surface condition measuring device of the present invention. FIG. 2 is a system diagram from the unevenness measuring wheel and the distance measuring wheel to the recorder in the embodiment of FIG. 1. FIG. 3 is a graph illustrating the accumulated wave of the amount of unevenness that appears on the chart of a record when the flatness of a road surface is measured using the simple road surface condition measuring device of the present invention. The symbols in the figure are explained as follows. 1 is a self-propelled vehicle, 2 is a towed longitudinal profilometer, 3 is an unevenness measuring wheel, 4 is a vertical motion sensor, 5 is a mileage measuring wheel, 6 is a transmitter, 7 is a recorder, and 8 is a converter. vessel.

Claims (1)

[Claims] 1. A road surface condition measuring device consisting of a vehicle and a towable longitudinal profilometer connected to the rear of the vehicle.
A recorder that records the amount of unevenness measured by the profilometer, a distance measuring device for the profilometer, and a transmitter that is linked to the distance traveled are installed. The recorder is sent to the recorder so that the chart on the recorder advances, and the amount of unevenness over a certain traveling distance is captured as an integrated wave, and the maximum value, minimum value, and range of the difference between the maximum and minimum values of the amount of unevenness can be recorded. A simple road surface condition measuring device characterized by: