JP2002048534A - Method of measuring longitudinal profile of road face - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and precisely measure flatness of a road face in a longitudinal direction of a road. SOLUTION: A measuring block 10 moving along the longitudinal direction of the road face is arranged with the first, second and third disk-shaped rollers 11, 12, 13 of the same outside diameter with prescribed spacing, and is provided with the first connection rod 14 attached to respective rotary shafts of the first and second rollers to connect them rotatably, the second connection rod 15 of the length same to that of the first connection rod attached to the respective rotary shafts of the second and third rollers to connect them rotatably, a distance measuring instrument 16 attached to the rotary shaft of the first or second roller, and a rotary encoder 18 attached to the second connection rod to detect an angle formed by the first connection rod and the second connection rod. The measuring block detects the angle formed by the first and second rods using an angle detection means, in every time when the block moves by the length of the first and second connection rods, so as to prepare a longitudinal profile based on a detected value therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a vertical profile of a road surface for measuring the flatness of a plane having irregularities such as a road surface of a road.

[0002]

2. Description of the Related Art Conventionally, as a method of measuring the straightness of an object to be measured on a straight line, as shown in Japanese Patent Publication No. 61-33364 (see FIG. 8), a straight guide parallel to the object to be measured 3 is used. The two displacement gauges 6, 7 are arranged in parallel at a short pitch toward the DUT 3 on the slide 4 movably engaged with 5, and the slide 4 is moved in one direction over the entire length of the measurement length for one pitch. Send once and at each position two displacement gauges 6,
A method of measuring the distance between the object 7 and the object 3 by each of the displacement meters 6 and 7 and processing the data to determine the straightness of the object to be measured together with the linear guide (hereinafter, referred to as a sequential two-point method). Are known. According to this sequential two-point method, straightness curves of both the linear guide and the DUT can be obtained independently, and the straightness of the DUT can be accurately measured even if the guide is not straight. It was very convenient.

[0003]

However, in the above-described sequential two-point method, there is a problem that the two displacement meters must always be maintained in parallel, and the measurement is very complicated. Also,
Recent roads employ drainage and sound-absorbing pavements with fine irregularities on the surface. For this reason, according to the sequential two-point method, care must be taken so that the displacement meter probe is not affected by the irregularities. There is a need to. An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a method of measuring a road surface profile in which the flatness of a road surface in a vertical direction of a road can be measured easily and accurately.

[0004]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention of claim 1 is that the measuring vehicle is moved on the road in the vertical direction and the vertical direction of the road surface is changed. A method for measuring a road surface longitudinal profile for measuring flatness, in which first, second and third rollers having the same outer diameter are arranged on a same straight line at predetermined intervals and in the same rotational direction. A first connecting rod having a predetermined length attached to each rotating shaft of the first and second rollers and rotatably connecting the first and second rollers, and each of the rotations of the second and third rollers; A second connecting rod having the same length as the first connecting rod attached to the shaft and rotatably connecting the second and third rollers;
Alternatively, a measuring block provided with a distance measuring device attached to the rotating shaft of the second roller, and angle detecting means attached to the second connecting rod and detecting an angle between the first connecting rod and the second connecting rod. Is elastically connected to the measurement vehicle by a connecting member so as to urge the road toward the road surface. With the movement of the measurement vehicle, the measurement block moves one pitch, which is the center-to-center distance of each roller, in the vertical direction of the road surface. Each time the vehicle moves, an angle formed by the first and second connecting rods is detected by an angle detecting means, and a longitudinal profile of a road surface is created based on the detected angle value.

According to the first aspect of the present invention, the measuring block includes first, second, and third rollers having the same outer diameter, each of which has a disk shape and is spaced apart from each other by a predetermined distance in the vertical direction. The first and second connecting plates rotatably connect the first and second rollers, so that the measuring block moves one pitch at a time in the vertical direction of the road surface so that the first and second rollers before the movement are moved. In this position, the second and third rollers after the movement are located. Therefore, by detecting the angle formed by the first and second connecting rods by the angle detecting means every time such a measurement block is moved by one pitch,
An angle change of the first connecting rod and the second connecting rod can be sequentially obtained. As a result, according to the present invention, by detecting the sequential diagonal in this way, a vertical profile of the road surface can be created more easily and accurately than in the conventional sequential two-point method. Also, by using a roller, even on a road surface having fine unevenness such as drainage pavement, the flatness of the entire road surface can be accurately measured without being affected by the unevenness.

According to a second aspect of the present invention, there is provided a measuring tool provided with three probes which are parallel to each other and are arranged at a predetermined interval. The measuring instrument is moved along the profile at predetermined intervals while the probes on both sides of the measuring instrument are in contact with the longitudinal profile, and for each unit of movement, the deviation from the longitudinal profile of the probe in the middle of the measuring instrument is determined and deviated. The flatness of the road surface is determined by calculating the standard deviation of the measured values of the dimensions.

According to the second aspect of the present invention, a measuring tool provided with three probes which are parallel to each other and are arranged at predetermined intervals is used.
The flatness of the road surface can be easily obtained based on the longitudinal profile obtained by the measuring method described in (1). Preferably, a software process using a microcomputer can quickly and accurately obtain a result.

[0008] A structural feature of the invention according to claim 3 is that a measuring tool having a predetermined weight attached to one end of a linear spring material having a predetermined spring constant is oriented vertically. And the weight is arranged on the upper end side, and in the state where the lower end is in contact with the longitudinal profile according to claim 1, is moved vertically at a predetermined speed, and the vertical displacement of the weight at that time is integrated, The flatness of the road surface is determined by calculating the integral value. This flatness evaluation method is based on the International Roughness Index
This is called iRi (international roughness index).

According to the third aspect of the present invention, according to the international roughness index iRi, a realistic road surface roughness can be obtained from the viewpoint of a vehicle running on the road. This international roughness index iRi is also preferably
By software processing using a microcomputer, quick and accurate results can be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a method for measuring a profile of a road surface D in a longitudinal direction according to the embodiment. 1 shows a schematic configuration of a measurement block 10 by a front view and a plan view. The longitudinal profile measurement position of the road D is measured at a passing position of the left wheel of the vehicle, which is called an out-wheel path (OWP) where the road surface is most worn. It has been found that the out-wheel path of this road is where 70-80% of the vehicles pass.

[0011] As shown in FIG.
It has three disk-shaped rollers 11, 12, and 13 made of hard rubber or plastic, which are front, rear, middle, and front, and the rollers 11, 12, and 13 are arranged on the same surface in the same rotation direction. ing. The outer diameter of the rollers 11, 12, and 13 is 100 mm in the present embodiment. Roller 11,
The rotating shafts 11a, 12a, 13
a is fixed through. Rear roller 11 and middle roller 12
A pair of long plate-shaped connecting plates 14 are fixed to both ends of the rotating shafts 11a and 12a so that the rotating shafts 11a and 12a can rotate. Also, the middle roller 12 and the front roller 13
A pair of long plate-shaped connecting plates 15 are fixed to both ends of the rotary shafts 12a and 13a so that the rotary shafts 12a and 13a are rotatable. In the present embodiment, the distance between the rollers 11 and 12 and the distance between the rollers 12 and 13 are both maintained at the measurement pitch of 250 mm.

A distance measuring device 1 for detecting the moving distance of the measuring block from the number of rotations of the middle roller 12 is provided on the first connecting rod 14.
6 is attached. In addition, the first connecting rod 14
Inclinometer 17 is mounted to detect the initial angle theta _B of the first connecting rod 14. Further, a rotary encoder 18 that detects the rotation angle θ of the second connecting rod 15 is attached to the second connecting rod 15. These distance measuring devices 1
6, the inclinometer 17 and the rotary encoder 18 are connected to a control device 21 provided in the measuring vehicle M, which will be described later, and perform data processing.

The measuring block 10 is connected to the measuring vehicle M by a connecting support rod 19 at a first connecting rod 14. The connection support rod 19 is rotatably attached to the first connection rod 14 and the measuring vehicle M, respectively. further,
The connecting support rod 19 is elastically connected to the measuring vehicle M by a coil spring 19a at an intermediate position in the longitudinal direction, and is urged by the coil spring 19a in a direction to slightly press the measuring block 10 against a road. Thus, the measurement block 10 can move while being lightly pressed against the road surface as the measurement vehicle M moves.

Next, the measurement of the unevenness of the road by the measurement system will be described. As shown in FIG. 3, the measuring block M is moved forward (longitudinally) with the measuring block 10 aligned with the OWP position of the road and the rear roller 11 set at the reference position B. 10 also moves. Accordingly, the measurement results of the distance measuring device 16, the inclinometer 17, and the rotary encoder 18 are input to the control device 21. Here, 250 mm corresponding to the distance between the rollers 11 and 12 and the distance between the rollers 12 and 13 which are the measurement pitch is set and input to the control device 21.
Every time the measuring block 10 moves by 250 mm, the middle roller 12 and the rear roller 11 after the movement are located at the position of the front roller 13 and the middle roller 12 before the movement, and the distance measuring device 16 and the rotary The measurement result by the encoder 18 is stored in the control device 21. Thereby, the rotation angle θ of the second connecting rod 15 with respect to the first connecting rod 14 is sequentially obtained for every 250 mm of the moving distance.

As shown in FIG. 4, the initial angle θ _B of the first connecting rod 14 at the initial position # 1 of the measuring block 10 is determined in advance, and the rotation angle of the second connecting rod 15 with respect to the first connecting rod 14 is determined. theta _1-1 is obtained as the measurement value of the rotary encoder 18. Then, at the position # 2 to the measurement block 10 has moved 1 measured pitch angle theta _1-2 of rotation of the second connecting rod 15 to the first connecting rod 14, is determined as the measurement value of the rotary encoder 18. Similarly,
Positions # 3 and # of measurement block 10 moved by one measurement pitch
4, # 5,..., The rotation angles θ _1-3 , θ _1-4 , θ _1-5 of the second connecting rod 15 with respect to the first connecting rod 14.
Is obtained as a measurement value of the rotary encoder 18. From the data of the distance of 250 mm per pitch and the data of the angle θ, a road O as shown in FIG.
An appropriate longitudinal profile f (x) of WP can be obtained. That is, the second connecting rod 15 with respect to the first connecting rod
By using the sequential diagonal method to sequentially detect the turning angle of the road, the complicated profile of maintaining the displacement meter in parallel unlike the conventional sequential two-point method is created, and the longitudinal profile of the road surface can be created simply and accurately. can do.

Next, a method for determining the flatness of the vertical profile will be described. As a first method,
As shown in FIG. 6, three probes 31a, 3 are arranged in parallel with each other and at a predetermined interval t (for example, 3 m).
The measuring tool 31 provided with 1b and 31c is placed at a predetermined interval t in a state where the probes 31a and 31c on both sides thereof are in contact with the longitudinal profile f (x) along the longitudinal profile f (x) obtained by the above method. To determine the deviation hx from the longitudinal profile f (x) of the probe 31b in the middle of the measuring instrument 31 for each movement unit, and calculate the standard deviation σ of the deviation hx in each movement unit. The flatness of the road surface was used. Usually, such a measurement process is performed using a computer, whereby a quick and accurate result can be obtained.

As a second method for determining the flatness of a longitudinal profile, the international roughness index iRi (int
The method is shown by using an international roughness index. FIG.
As shown in FIG. 5, a measuring tool 33 having a predetermined weight weight 35 attached to one end of a linear spring material 34 having a predetermined spring constant,
The linear spring member 34 is turned up and down and the weight 35 is arranged on the upper end side, and the lower end is moved in the vertical direction at a predetermined speed v with the lower end in contact with the longitudinal profile f (x). The road surface flatness is obtained by integrating the displacement in the direction and calculating the integrated value. The method for determining the international roughness index iRi is usually performed by software processing using a microcomputer, whereby a quick and accurate result can be obtained. This international roughness index
According to iRi, realistic road surface roughness can be obtained from the viewpoint of a vehicle traveling on a road.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a measurement block attached to a measurement block for measuring flatness of a road surface according to an embodiment of the present invention.

FIG. 2 is a plan view schematically showing the measurement block.

FIG. 3 is an explanatory diagram illustrating a process of measuring road surface unevenness using a measurement block.

FIG. 4 is an explanatory diagram schematically showing a state at each measurement point of a measurement block.

FIG. 5 is an explanatory diagram illustrating a result of analysis by a measurement block, which is shown as a road surface shape.

FIG. 6 is an explanatory diagram illustrating a method for analyzing road flatness using the results of FIG.

FIG. 7 is an explanatory diagram illustrating a method of analyzing the flatness of a road surface by the iRi method using the results of FIG.

FIG. 8 is an explanatory diagram illustrating a conventional method for measuring the flatness of a road surface by a sequential two-point method.

[Explanation of symbols]

10: measurement block, 11, 12, 13 ... first, second, second
Third roller, 11a, 12a, 13a...
... 1st connecting rod, 15 ... 2nd connecting rod, 16 ... distance measuring device,
18 ... Rotary encoder (angle detection device), 19 ... Connection support rod, 19a ... Coil spring, 21 ... Control device, M ...
Measuring car.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D053 AA32 AD01 2F062 AA55 AA72 AA73 AA81 BC10 CC22 EE01 EE25 EE51 FF03 GG38 GG90 HH15 JJ03 JJ06 2F069 AA54 AA72 AA83 BB24 DD25 GG02 GG21 GG21 GG21 GG21 NN

Claims (3)

[Claims] 1. A method for measuring a vertical profile of a road surface by measuring a flatness of a road surface by moving a measurement vehicle on a road in a vertical direction, the method comprising the steps of: A first, a second and a third roller having the same outer diameter in the form of a disk are arranged together, and are attached to the respective rotating shafts of the first and the second rollers to rotate the first and the second rollers. A first connecting rod having a predetermined length to be connected freely, and a first connecting rod attached to each rotating shaft of the second and third rollers and rotatably connecting the second and third rollers. A second connecting rod having the same length, a distance measuring device attached to the rotating shaft of the first or second roller, and a first connecting rod and a second connecting rod attached to the second connecting rod. A measuring block provided with angle detecting means for detecting an angle formed by the measuring vehicle. Elastically connected to the road surface by a connecting member so as to be urged toward the road surface, and the measurement block moves one pitch, which is the distance between the centers of the rollers, in the longitudinal direction of the road surface as the measurement vehicle moves. Each time the angle is formed by the first and second connecting rods is detected by the angle detecting means, and a vertical profile of the road surface is created based on the detected angle value. Measurement method. 2. A measuring instrument comprising three probes arranged in parallel with each other and spaced apart from each other by a predetermined distance, and the measuring instrument and the probes on both sides thereof are arranged along the longitudinal profile according to claim 1. In the state of being in contact with the vertical profile, the probe is moved at the predetermined interval unit, and for each unit of movement, a deviation of the probe in the middle of the measuring tool from the vertical profile is obtained, and a standard deviation of the measured value of the deviation is obtained. A road surface profile measurement method, wherein the road surface flatness is calculated by calculating 3. A measuring instrument comprising a linear spring material having a predetermined spring constant and a weight having a predetermined weight attached to one end thereof, wherein the linear spring material is directed up and down and the weight is disposed on the upper end side, and the lower end is formed on the lower end. In contact with the longitudinal profile according to claim 1,
A method for measuring a vertical profile of a road surface, wherein the road surface is moved in a vertical direction at a predetermined speed, the vertical displacement of the weight at that time is integrated, and the integrated value is calculated to obtain the road surface flatness.