JPS59202002A - Simplified road surface status measuring apparatus - Google Patents

Abstract

PURPOSE:To enable to simply measure the road surface status by a construction wherein a vehicle capable of traveling includes a vibrometer, a recorder for recording an amplitude of the signal from the vibrometer a mileage meter for the vehicle, and a signal in conjunction with the mileage meter. CONSTITUTION:Every time when a self-propelled vehicle 1 or pulled vehicle 2 loaded with a vibrometer 3 travels over a certain distance, a signal 7 in conjunction with a trip meter 6 mounted to a distance measuring wheel 5 transmits a pulse signal. This pulse signal is sent to a recorder 4 to advance a chart thereof. Accordingly, the amplitude recorded on the chart due to unevenness of the road surface exhibits accumulation of amplitudes occurred through a certain section being traveled. The range of the amplitude can be easily read and analysis work of the road surface status is very simplified, thus permitting efficient survey by few examiners.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple road surface property measuring device that can easily and accurately measure the properties of a paved road surface.

Japan's roads have been steadily improved through past efforts, and the rate of paving has also improved.

Although these pavements have been fulfilling their mission well for many years, in recent years the proportion of maintenance and repair work has been increasing due to a decline in serviceability. Maintenance and repair is important not only to ensure the serviceability of pavements, but also from the viewpoint of pavement durability and economic efficiency.
It is necessary to do this early. 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. However, this method actually measures three road surface characteristics: the crack rate, rut depth, and standard deviation of longitudinal unevenness, and then calculates the pavement service index (i' S
T, ) is calculated, and the degree of road surface repair is determined based on the PSI value. The disadvantage is that the investigation requires a large amount of money and the mobilization of personnel.

It is nearly impossible to use this method to survey the nation's roads, which contain a total of more than 1.1 million yen, and calls are being made for the development of a simpler measuring method.

The object of the present invention is to meet such expectations, and to provide a simple road surface property measuring device that can replace the road surface survey method with the above-mentioned drifting method.

That is, the present invention provides a vehicle capable of running, which is provided with a vibration meter, a recorder for recording the amplitude of the vibration meter, a vehicle mileage measuring device, and a signal device interlocked with the mileage measuring device't. , the special enemy is that the pulse signal of the traffic signal that is emitted every certain distance traveled by the vehicle is sent to the recorder to advance the chart on the recorder, and the maximum width of the amplitude during that certain distance traveled is recorded. The gist of this paper is the structure of a simple road surface condition measuring device.

The conventional standard method based on the "Maintenance and Repair Guidelines" calculates the three road surface characteristics of road + ffi for each lane: crack rate, amount of rutting, and amount of longitudinal unevenness, and calculates the pavement service index ( Psi).

PS I = 4.53-0.5181og σ-0.
37] C-0, ]74D2 here PSl - Pavement serviceability index σ - Standard deviation of longitudinal unevenness (mm) C, S: Crack rate (%) 1) - Average depth of webbing (Cm ) In addition to PSL, the maintenance index (
MCI). This MC1 is a combination of the crack rate, the amount of rutting, the amount of vertical unevenness, and a comprehensive evaluation by humans, and this 1XAcJ is also used together with 1°S1.

PSI can be said to specifically evaluate road surfaces using an index that comprehensively captures road surface properties. The ``Road Maintenance and Repair Guidelines'' lists approximate construction methods as shown in Table 1.

Table-1 Serviceability index (Psi) Approximately corresponding construction method; 3 to 21
According to the standard method in ``Surface Treatment 2-11 Overlay 1-O Replacement 1-Maintenance and Repair Guidelines'', the cracking rate, amount of rutting, amount of longitudinal unevenness, etc. are measured using the following methods.

The crack rate was determined by assuming a U-th line on the road surface every +fJ 0.5 m vertically, and writing down the crack situation for each fJt-th lane for each lane, using a sketch method and taking photographs using a crack measurement vehicle. The measurement method used is to fill in the information from the photograph.

The rut gauge measures a certain section of the line (IK [approx. Se is expressed as the average value of those maximum values, il]11 constant method is the method using a straight line ruler or water system, and the method using a rut i! There is a method using fixed wheels.

Measurement force of unevenness in the direction of longitudinal force, corrugation, and direct reading type unevenness measuring device with 4 feet (3n1 ruler), mafc
i”t, 1.5 using a 3 m profilometer
1lll is determined at m intervals. Then, all measured values are divided into a certain number of groups from 6 to 10 o'clock from the beginning, and the difference between the maximum and minimum values of each group, that is, the range (R), is calculated. Calculate the average value (and) of the range ('a) of the group. Next, calculate the standard deviation (σ) using the following formula.

where d2 is a constant that varies depending on the number of measurements in the group.

Next, the simple road surface condition measuring device of the present invention will be explained according to the illustrated embodiment. The measuring device shown in FIG. 1 shows an example using one vehicle IPJ@, and the measuring device shown in FIG. 2 shows an example using two vehicles. Further, FIGS. 3 and 4 show system diagrams from the distance measuring wheel to the vibration meter and its recorder in the embodiment shown in FIGS. 1 and 2, respectively.

In the figure, (])id is a self-propelled vehicle, and in FIG.
You can also use vehicles such as light vans.

In Figure 2, it is a towing vehicle.

(2) is a towed vehicle, which is equipped with a measuring instrument and is towed by a self-propelled vehicle (1), which is a towing vehicle.

(3) is a vibration meter, and a mechanical vibration meter is used which has a vibration system consisting of a weight, a spring, a damper, etc. This movement meter (3) is mounted on a traveling white iLA, a vehicle (1), or a towed vehicle (3). (1) is a recorder that records the amplitude of the oscillation meter (3) against the distance traveled, as shown in the diagram or in the form of a display (5). ) is a distance measuring wheel, which is installed separately from the running wheels and is equipped with an air cylinder or the like so that it always contacts the road surface with a constant pressure. (6) is a triple meter, It is attached to the distance measuring wheel (5) and forms its mileage measuring device.

Reference numeral (7) is a signal device which is linked to the triple meter (6) of the mileage measuring device and oscillates into a pulse signal every fixed distance traveled. Four pulse signals emitted from this signal device (7) are sent to a recorder (4), and the chart of the recorder (4) is advanced by the pulse signals. (8) It is a beam, and it is useless to support the recorder (4).

When using the simple road surface property measurement method of the present invention, first select a plurality of reference routes, run the road surface measuring machine of the present invention on those road surfaces at a speed of -69, and then In other words, measure the maximum width of the amplitude over a certain travel distance within the specified section, find the standard deviation of them, and actually measure the road surface condition in the same section of the route. , the standard deviation of the amount of longitudinal unevenness in one space, the service index of the pavement, etc. are determined, and the standard deviation value obtained from the maximum width of the amplitude obtained by the measuring device of the present invention, the standard deviation value of the amount of longitudinal unevenness by actual measurement, Correlations such as the pavement service index are determined in advance.

Next, for the route on which the road surface properties are to be measured, the measuring device of the present invention is run at a uniform speed, and the predetermined 14
The road surface quality is evaluated by measuring the maximum width of the amplitude for each interval, finding the standard deviation, and converting it into the standard deviation of the amount of longitudinal unevenness, the pavement service index, etc. using the correlation determined in advance.

When using the measuring device of the present invention, self-propelled vehicles (1
) or the towed vehicle (2) is equipped with a vibration meter (3), so if this measuring device is driven at a constant speed on a route determined by 1HII, the condition of unevenness on the road surface can be measured by 1V. (3) can be detected very easily. It has the practical advantage of not requiring labor-intensive instruments such as M-reading unevenness measuring instruments and profile meters that are conventionally used for road surface measurements, and also records the amplitude of the radiometer (3) on the recorder (4). By doing so, it has the practical benefit of being able to automatically record the unevenness of the road surface for one meter of the regular route.

However, when using the measuring device of the present invention, a self-propelled vehicle equipped with a vibration meter (3) (1) is equipped with a travel distance determination device that transmits a signal every time the towed vehicle (2) travels a certain distance. Since the pulse signal from the signal device (7) interlocked with the triple meter (6) causes the chart F of the recorder (51) to be set in four lines, the amplitude due to road surface irregularities recorded on the chart L is as follows. As shown in Figure 5, the amplitude within a certain interval of travel is recorded, and the maximum and minimum values within that interval are displayed, making it easy to read the range W of the amplitude. , there is no need to perform integration as in the conventional case, making analysis of the road surface extremely easy, and has the practical benefit of minimizing the consumption of CharI.

For these reasons, the simple road surface properties of the present invention are f! 12, the survey can be carried out efficiently by a small number of surveyors, making it possible to conduct road surface surveys over a wide area.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is a side view showing the arrangement of instruments when a self-propelled vehicle is used;
Figure 2 shows the arrangement of instruments in a case where the towed vehicle is protected. Figure 3 is a system diagram of the embodiment shown in Figure 1. Figure 4 1 is the system diagram shown in Figure 2. A system diagram of the embodiment shown in
Figure 5 shows the amplitude recorded on the recorder chart (
3), Figure 6 is a relationship diagram between L'SL and the standard deviation calculated from the maximum width of the amplitude obtained by the measuring device of the present invention, and Figure 7 is the profile meter vibration + Ifl).
4. Standard calculated from the amount of unevenness and the maximum width of the amplitude obtained by the measuring device of the present invention. It is a correlation diagram with deviation. The deviations in the explanation of the symbols in the J diagram are as follows. (1) is a self-propelled vehicle (2) is a towed vehicle (3) is j
Dragon/costume (1) is a recorder (5) is a distance measuring wheel (6) is a triple meter (7) is a signal device
(8) Shoes/Yont 1 Figure 2 Figure l Jl? 3 Illustrations 4 Illustrations 5 Illustration procedure amendments December 5, 1980 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office 1 Indication of the case 1981 Patent Application No. 77 +-], No. 33 2 Name of the invention Simple road surface circular Measuring device; 3 Relationship with the case of the person making the amendment Representative of the patent applicant Jun Sakaguchi 11 ``Detailed description of the invention'' and 1 in 811+-f of the subject of amendment
- Brief explanation of the drawings" section 5 Contents of amendment (1) Specification No. 8 - "Determines the degree of repair" in lines 4 to 15 to [Determines the standard of repair and removal. ``It is something that I do.'' (2) Specification box page 4: Lines 3 to 4 In addition to the 1-vertical i analysis unevenness amount of Ebisu, 1 attraction evaluation 1 music amount by human is added,
'' was corrected to ``It is used for comprehensive evaluation from the standpoint of road administrators, using time-sensitive information such as the amount of longitudinal unevenness.'' (3) Page 7 of the specification]: 1-Profilometer" written in line 3 has been corrected to "Profilometer." (4) In the fourth line of page 7 of the specification, the phrase ``contacts'' should be amended to ``contacts j''. (5) ``1 triple meter'' written on line 5 of the same page should be replaced with ``1 trip meter''. (6) 1-Triple meter written in line 8 of Dosei!
(i) Put J on [trip meter (6)] sleeve iE L
Dimensions. (7) The 8th chapter of the specification, "A'l I 1, father's 1 serviceability index," is corrected to ``serviceability index.'' (8) Akira
Triple meter (6) j [-trip meter (
6)] Adjust the sleeve size. 1! 11 Trisection'tll book-p; Page 10, line 19, 1 [triple meter-1 to 1-1-ri, b-meter] to Y-sanno.

Claims (1)

[Claims] A vehicle that can run is equipped with a vibration meter, a recorder that records the amplitude of the vibration meter, a vehicle mileage measuring device, and a signal device that is linked to the mileage measuring device. A simple road surface condition measuring device characterized in that a pulse signal from a signal transmitter is sent to a recorder to advance a chart on the recorder, and the maximum width of the amplitude during a certain traveling distance is recorded.