JP2012173095A - Road surface flatness measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road surface flatness measuring device capable of measuring flatness of a road surface with a vehicle traveling on the road surface of a highway or an ordinary road while allowing the vehicle to travel at normal traveling speed.SOLUTION: A road surface flatness measuring device of the present invention: has laser ranging devices, which measure respective heights to a road surface, at three locations along a traveling direction of a vehicle; and measures a shape of the road surface through fluctuation of one range-finding value of an intermediate ranging device against a reference line connecting front and rear ranging devices. The road surface flatness measuring device can measure flatness of the road surface while allowing the vehicle to travel at normal traveling speed. In addition, the road surface flatness measuring device: enables a data processing unit such as a personal computer and accessory devices thereof to be mounted on the vehicle or in the vehicle; has no limitation in a distance on the road surface to be measured; and can largely save time and labor with reduced measuring time. Also, the road surface flatness measuring device can use a wheel of the vehicle as an encoder for measuring the distance by making each laser macrometer installable in a space below a loading platform of a truck and other devices mountable on the loading platform.

Description

  The present invention relates to a road surface flatness measuring apparatus capable of measuring the shape of a road surface such as an expressway or an ordinary road at a normal traveling speed of an automobile.

A typical example of a conventional road surface flatness measuring apparatus is that of Utility Model Registration No. 3139705. As shown in FIG. 5, the road surface flatness measuring apparatus 50 includes a front carriage 52 and a rear carriage 53 that are grounded by four casters on the front side and the rear side of the support frame 51, respectively. A measuring wheel 54 is provided at the center so as to be movable up and down, and a displacement measuring encoder 55 for calculating the vertical displacement of the measuring wheel 54 with respect to the ground level between the front carriage 52 and the rear carriage 53, and movement of the measuring wheel 54 A distance measuring encoder 56 for measuring the distance is provided. Thus, a pulling handle 57 is provided on the front carriage 52 side.

Therefore, when the operator travels on the road surface while pulling the road surface flatness measuring device 50 with the handle 57, the measurement wheel 54 advances while being measured by the distance measuring encoder 56, and for each set distance, The vertical displacement of the measurement wheel 54 with respect to the ground level of the front carriage 52 and the rear carriage 53 is measured by a displacement measurement encoder 55, and the measurement data is transmitted to a data processing unit such as a personal computer and recorded in real time. It was.
Utility Model Registration No. 3139705

  However, in the conventional road surface flatness measuring apparatus 50, a data processing unit such as a personal computer or the like that receives the transmission of measurement data from the displacement measurement encoder 55 and the distance measurement encoder 56 that are operated by information from the measurement wheel 54. It is difficult to load the frame on the support frame. Therefore, since it is transmitted to a data processing unit such as a personal computer using a cable or radio, the range that can be measured is limited, often relying on the human power of the operator, There was a limit to the distance traveled on the road. Moreover, much time and labor were required for the measurement.

  The present invention solves the above-described problems, and the object of the present invention is to allow a vehicle running on a road surface such as a highway or a normal road to measure the flatness of the road surface while traveling at a normal traveling speed. An object of the present invention is to provide a road surface flatness measuring apparatus.

  In order to achieve the above object, a road surface flatness measuring apparatus according to the present invention includes laser distance measuring devices for measuring the height to the road surface at three locations along the direction of travel of the automobile, and the laser distance measuring device of the laser distance measuring device. Among them, it is characterized by measuring the shape of the road surface by the variation of one distance value in the middle with respect to the reference line connecting the two distance measurement values before and after, and measuring the flatness of the road surface while running the car at normal driving speed Configured to be possible.

  The road surface flatness measuring apparatus according to claim 2 is characterized in that the laser rangefinders are installed at equal intervals in a space under a truck bed, and the bed is a data processing unit such as a personal computer and the like. It was configured to be used as a loading space for the attached equipment.

  Furthermore, the road surface flatness measuring apparatus according to claim 3 is characterized in that the wheel of the automobile is a distance measuring encoder, and the measurement distance is obtained by a wheel having a large diameter in the measurement of road surface flatness. Configured to be.

  According to the present invention, it is possible to measure the flatness of the road surface while driving the vehicle at a normal traveling speed, and it is possible to mount a data processing unit such as a personal computer or the like on the vehicle or in the vehicle, and to measure the distance on the road surface. There are various advantages such as that there is no limit, the measurement can be completed in a short time, and time and labor can be greatly saved.

  Further, according to the invention of claim 2, the laser transducers are installed at equal intervals under the truck bed, and the bed can be loaded with a data processing unit such as a personal computer and its associated equipment, greatly increasing the measurement range. It has an excellent effect that it can be expanded.

  According to the invention of claim 3, in measuring the flatness of the road surface, since the measurement distance is obtained by a wheel having a large diameter, the measurement distance is as short as 30 m and 50 m, but conversely as 10 km and 20 km. Even if it becomes long, it always has an excellent effect that an accurate distance measurement and flatness measurement can be performed.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a side view showing a state in which the device of the present invention is attached to a track, FIG. 2 is a perspective view showing a state of attachment of the laser rangefinder by an attachment frame, FIG. 3 is a block diagram showing an outline of the device of the present application, and FIG. FIG. 5 is a perspective view showing a conventional apparatus.

  In FIG. 1, reference numeral 1 denotes an automobile on which a road surface flatness measuring device is mounted. In the case of the automobile 1, a truck is shown, but it may be a passenger car, a one-box car, a custom-made exclusive vehicle, or the like. . The truck 1 includes a driver's seat 1a, a loading platform 1b and its side wall 1b ', and wheels (front and rear wheels) 1c. In the case of the truck 1, laser rangefinders 2a, 2b, and 2c are installed at three locations along the traveling direction in the space under the loading platform. In passenger cars and one-box cars, which have a smaller space under the vehicle body than a truck, holes may be made in the floor as necessary to ensure the distance between the laser rangefinder and the road surface.

  As shown in FIG. 2, the laser rangefinders 2a, 2b, and 2c are connected to an end of a branch frame 4a fixed to a mounting frame 4 that is hooked and attached to an upper end edge of a side wall 1b 'of a loading platform of the track 1. It is attached to the part at the same height position toward the road surface 3.

  Although the distance measurement to the road surface 3 by the laser distance measuring devices 2a, 2b, and 2c is not shown, a laser irradiation unit and a laser light reception unit are arranged adjacent to each other, and each of the distances to the road surface 3 is as shown in FIG. The height h can be measured. This measurement can be performed while the truck 1 is traveling. Lasers used here include He-Ne lasers, and can measure distances even in bright light in the daytime. However, when there is a risk of malfunction caused by sunlight, it is better to cover the laser range finder to create a shade.

  The laser rangefinders 2a, 2b, and 2c are connected to a data processing unit such as a personal computer mounted on the loading platform 1b of the truck 1 and its associated equipment (not shown) via a cable 5, respectively. It is connected beyond. Of course, the floor of the loading platform may be penetrated.

  Of the laser distance measuring devices 2a, 2b, and 2c installed at three locations along the traveling direction of the automobile 1, the distance measurement values at the distance measuring points A and C of the two front and rear laser distance measuring devices 2a and 2c are connected. The shape of the road surface 3 can be measured by the variation in the distance value of the distance measuring point B by the intermediate laser distance measuring device 2b with respect to the reference line (corresponding to the road surface 3 in FIG. 3).

  In other words, the distance measurement values at the distance measurement points A and C of the two front and rear laser distance measuring devices 2a and 2c indicate the level of the road surface 3, and the distance measurement point B by the intermediate laser distance measurement device 2b is sinking. The distance measurement value becomes minus α, and when the distance measurement point B by the intermediate laser distance measuring device 2b is raised, the distance measurement value becomes plus α.

  Thus, the distance values obtained by the three laser distance measuring devices 2a, 2b and 2c are compared by the comparator 6 and transmitted to the personal computer 7, and the distance measurement encoder 8 obtained from the rotational speed of the wheel 1c is used. Calculated and stored in consideration of information. The transmitted data can be output as an image on the monitor 9 in real time, and the stored data is printed out as an output 11 such as a data sheet or graph by the printer 10 at an appropriate time. FIG. 4 shows the measurement of the shape of the road surface 3 every 10 m and measured over 1 km. In this figure, detailed numerical values are omitted, and only the entire shape is shown.

  When a long distance is measured by an automobile equipped with the road surface flatness measuring device, the possibility that an error occurs in position information as the distance increases cannot be denied. There are two means for correcting this error. One is to capture GPS position information, and the other is to mount a laser sensor on the car and place a reflector at a fixed point on the shoulder to mark the distance signal. It can be installed as an option on the device, and possibly other means to correct the error.

  The road surface flatness measuring device of the present application enables a vehicle running on a road to measure the flatness of a road surface while traveling at a normal traveling speed. It is also possible to measure the flatness of the road surface over a short distance only in the construction section where the three-dimensional intersection is made through an underpass. It is something that can be done.

It is a side view which shows the state which attached this-application apparatus to the track | truck. It is a perspective view which shows the attachment state by the attachment frame of a laser range finder. It is a block diagram which shows the outline | summary of this application apparatus. It is the schematic of the measurement data by this application apparatus. It is a perspective view which shows a conventional apparatus.

1 Car (truck)
DESCRIPTION OF SYMBOLS 1a Driver's seat 1b Cargo bed 1b 'Side wall 1c Wheel 2a, 2b, 2c Laser range finder 3 Road surface 4 Mounting frame 4a Branch frame 5 Cable 6 Comparator 7 Personal computer 8 Distance measuring encoder 9 Monitor 10 Printer 11 Output A, B, C Ranging point

Claims (3)

  Laser distance measuring devices that measure the height to the road surface are provided at three locations along the direction of travel of the automobile, and one of the laser distance measuring devices is an intermediate one with respect to a reference line that connects two distance measurement values. A road surface flatness measuring apparatus that measures the shape of a road surface by fluctuation of two distance measurement values.   2. The road surface flatness measuring apparatus according to claim 1, wherein the laser rangefinders are installed at equal intervals under a truck bed.   The road surface flatness measuring apparatus according to claim 1, wherein the wheel of the automobile is a distance measuring encoder.

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