JPH03225213A - Device for detecting thickness of pavement - Google Patents

Abstract

PURPOSE:To highly accurately detect the thickness of a pavement without modifying a vehicle by arranging a rotary laser projector capable of projecting a laser beam in the horizontal direction in the vicinity of a road to be paved, and fixing laser beam receivers on two front and rear positions of the side of a screed arm. CONSTITUTION:A laser level 1L rotating in parallel with ground surface is set up by rotating the head of the rotary laser projector 1 and detected by two laser beam photodetectors 3a, 3b fixed to the two front and rear positions of the side of the screed arm 2. Then upper and lower deviations from the level 1L to be a reference face are found out to detect the position of a distance detector 4 positioned between the front and rear photodetectors 3a, 3b and find out the position of unpaved ground surface from the reference face. Then, the traveling distance of an asphalt finisher is detected by a traveling distance meter 8 arranged on the lower part of the vehicle 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a road surface pavement thickness detection device used in a leveling machine such as an asphalt finisher.

"Prior Art" Asphalt finishers have been known as devices for spreading paving materials such as asphalt on road surfaces to pave roads.

In this asphalt finisher, while the vehicle is running, the paving material (asphalt) in the hopper is sent to the sprayer at the rear of the vehicle using a half eater, spread over the entire road surface using a spreading dust screw, and this asphalt is flattened using a screed. It is laid out evenly.

By the way, when paving a road surface, it is necessary to maintain the pavement thickness at a predetermined J-thickness design value. Conventionally, a worker other than the operator of the asphalt inflator inserted a gauge rod into the pavement surface and measured the pavement thickness by measuring a total of 12 mm.
It was +1.

In this way, measuring and confirming pavement thickness with a gauge rod requires a worker in addition to the operator of the asphalt finisher, and it also causes damage to the pavement surface after construction. , there is a problem that it is only possible to measure i continuously.

Therefore, in order to solve this problem, various pavement thickness automatic i'! III fixed device is the proposed device. (For example, Utility Model Publication No. 60-L 72808 and Japanese Unexamined Patent Publication No. 619/1989)
(See Publication No. 103) [Problems to be Solved by the Invention] However, the conventionally known pavement lubrication device described above estimates the pavement thickness on the assumption that the road surface before paving is flat. ), and the road surface of 111 before paving is uneven.
Another problem is that if you have morning sickness, there will be a difference in JF fIII.

In order to address the second problem, the applicant proposed a laser beam 21 that is almost movable on the ground surface along the finisher movement position.
A laser projector is installed that projects a
F? Two vertical axes are provided, and a laser projector is placed on each of the vertical axes. He has secretly discovered a device that can detect the height and accurately detect the thickness of pavement even when there are unevenness on the bamboo road surface, and is currently applying for a patent. In this case, it is necessary to provide two vertical axes, front and rear, that slide against the road surface and move up and down in response to the unevenness of the road surface.If it is applied to an existing asphalt finisher, the vehicle body will need to be modified, and a light receiver for laser level detection will need to be installed. The problem remained that there were restrictions on the mounting position of the device.

The object of the present invention is to solve all of the above problems without modifying the body of an asphalt finisher.

[Means for Solving the Problems 1] The present invention provides means for solving the above problems, and includes a rotary laser projector 1 capable of projecting a laser beam in the horizontal direction near the road surface to be paved. At the same time as installing the asphalt finisher screed arm 2
It is written in two places on the front and back sides of - Sabim's receiver 3a, 3
b is attached, and a distance detector l capable of measuring the distance to the ground surface is attached to r of the screed arm 2 between the light receivers 3a and 3b, and l is attached to the rear part 1 of the screed arm 2, and the screed is attached to the screed arm 2. The object of the present invention is to provide a pavement thickness detecting device characterized in that an angle detector 6 is disposed between the upper part of the insect body 5 and an odometer 8 is disposed above the insect body 7.

'Example 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 of 1 is a rotating laser projector capable of projecting a laser beam in the horizontal direction.It is installed at an appropriate location near the road surface to be paved, and by rotating the head, it can project a laser beam on the ground. The laser level IL can be set to rotate in rows.

Reference numeral 2 is a screed arm of an asphalt fin. On its side surface, Zaheem light receivers 3a and 3b are attached at two places, front and rear, so that the laser level IL can be detected. There is.

4 is a distance detector attached to the lower surface of the screed arm 2 between the light receivers 3a and 3b, and is capable of measuring the distance to the ground surface.

An angle detector 6 is disposed between the rear upper surface of the screed arm 2 and the upper part of the screed 5, and can detect the angle between the screed arm 2 and the screed 5. Further, a mileage meter 8 is provided at the bottom of the vehicle body 7, so that the distance traveled can be detected.

The operation of the present invention will be explained with reference to the embodiments described above.

By rotating the head of the rotary laser projector 1, a laser level IL that rotates parallel to the ground surface is set, and the laser beam receivers 3a and 3b attached to the front and rear sides of the screed arm 2 emit the laser beam. Level IL is detected, this laser level 1■- is used as a reference plane, and the vertical deviation from this is determined.
3b, the position (distance Aidt) of the distance detector 4 with respect to the reference plane is detected, and the detected value of the distance detector 4 (
The distance to the ground surface (Aid2) determines the position (distance #d3) of the ground surface before paving (for example, point A in Figure 3) with respect to the reference plane.
= d l + (i.) can be known.

That is, in FIG. 3, since the positional relationship between 3a, 3b and 4 is known in advance as mechanical dimensions, at which position of the light receivers 3a and 3b is the optical axis (laser level I L ) located?
dl can be found by determining whether or not the ground is crossed. Then, by measuring the distance (1□) from the distance detector 4 to the ground surface, d3 - dl + d2 can be easily found.

Next, the traveling distance of the asphalt finisher is detected by the one-line distance meter 8 on the body 7F section 11 (for example, the 1-1
As shown in FIG. 3, when the rear end of the screed 5 reaches point A in FIG.

3b determines the position of the screed arm 2 (front and back inclination)
Then, the angle detector 6 is used to determine the relationship between the screed arm 2 and the screed 5, and the paving +'1
'F can be calculated.

That is, as shown in FIG. & When reaching the end or point A, the positional relationship between the reference plane IL and the rear end of the screed 5 - the F plane (distance fll d
4) is determined by the inclination of the screed arm 2 and the detected value of the angle detector 6, so the pavement JzoT=d, -
The pavement thickness T can be calculated by d.

:Effect] According to the present invention, a rotary laser projector l capable of projecting a laser beam in the direction of water is installed near the road surface to be paved, and a screed arm 2 of an asphalt finisher is installed.
The laser beam is received at two places on the front and back sides of the 7S3
a, '3b, and a distance detector capable of measuring the distance to the ground surface on the F of the screed arm 2 between the light receivers 33a and 3b, and the rear of the screed arm 2. An angle detector 6 is installed between the second surface and the F section of the screed 5, and an odometer 8 is installed at the bottom of the vehicle body 7. It is possible to continuously detect irregularities and the corresponding pavement thickness, and since the laser beam receivers 3a and 3b are attached to the screed arm 2, there is no need to make any modifications to the vehicle body. Since distance detection errors to the ground surface do not accumulate, pavement thickness can be detected with high accuracy.

[Brief explanation of drawings]

FIG. 1 is a side view of the device of the present invention, and FIGS. 2 to 4 [;
! 1 is an explanatory diagram for one year. Rotating laser projector IL, laser level (reference plane) 2 niscrete arms 3a, 3b, receiver 4: distance detector 5, screed 6, angle detector 7: heavy object 8: 1st row yr: M meter

Claims (1)

[Claims] 1) A rotary laser projector (1) capable of projecting a laser beam horizontally near the road surface to be paved is installed, and a laser beam receiver (3a) is installed at two locations on the front and back sides of the screed arm (2) of the asphalt finisher. ), (
3b), and a distance detector (4) capable of measuring the distance to the ground surface is attached to the lower surface of the screed arm (2) between the light receivers (3a) and (3b), and the screed arm (2 ), an angle detector (6) is disposed between the rear upper surface of the vehicle and the upper part of the screed (5), and an odometer (8) is disposed at the bottom of the vehicle body (7). .