JP2002339314A - Paving thickness controlling device of asphalt finisher and asphalt finisher and paving execution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a paving thickness with high accuracy without being influence on work environment to ensure a useful and a predetermined paving thickness. SOLUTION: An asphalt finisher adjusting the paving thickness by changing a height and an inclination of a screed 3 provided backward of the body 1 includes a plurality of electro-optical distance measurement devices 18 and 19 provided along the traveling direction of at least one side of the screed at a predetermined interval and the paving thickness adjusting section 10 adjusting the height and the inclination of the screed so that the paving thickness can be calculated from a difference of the distance to the ground surface obtained by the electro-optical distance measurement devices and that the calculated paving thickness can become a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt finisher for laying asphalt mixture in pavement work,
And a pavement thickness control device for an asphalt finisher.

[0002]

2. Description of the Related Art As a final step of pavement work, there is a work of evenly spreading an asphalt mixture, and the thickness of the spread asphalt mixture is required to be a specified value or more in view of durability and the like. .

The work of spreading the asphalt mixture is performed by an asphalt finisher. A conventional asphalt finisher will be described with reference to FIG.

At the front of the vehicle body 1, there is provided a hopper 2 for containing asphalt mixture. The asphalt mixture in the hopper 2 is transported rearward (to the right in FIG. 12) by a feeder (not shown) located at the lower part of the vehicle body 1, and then a screw provided in a direction perpendicular to the feeder (Not shown) evenly spread left and right and spread by screed 3.

The screed 3 is supported via a leveling arm 4 by a support shaft 5 located substantially at the center of the side surface of the vehicle body 1. The support shaft 5 is a pivot cylinder 10
To move up and down.

[0006] Each of the leveling arms 4 is provided with a measuring device 6. The measuring device 6 includes a measuring arm 7 provided on the leveling arm 4, a first height sensor 8 provided at a tip of the measuring arm 7, and a second arm provided at a central portion of the measuring arm 7. 2 height sensor 9
And a tilt sensor 1 for measuring a tilt angle of the measuring arm 7
And 1. The base end (the right end in the figure) of the measurement arm 7 is supported by a pin on a frame 12 supporting the screed 3, and the measurement arm 7 is tilted up and down by the screed 3. Note that the first height sensor 8 and the second
Is a height sensor using ultrasonic waves.

The height detected by the first height sensor 8 and the second height sensor 9, the interval between the first height sensor 8 and the second height sensor 9, and the inclination Sensor 11
The thickness of the pavement can be calculated from the inclination angle detected by the control unit and the distance from the support shaft 5 to the screed 3.

The pavement thickness is determined by the height of the leveling arm 4 and the angle of the screed 3. When the pavement thickness is increased, the height of the leveling arm 4 is adjusted by the pivot cylinder 10 so that the height relative to the screed 3 can be kept constant. Thus, the pivot cylinder 10 is driven based on the pavement thickness detected by the measuring device 6, and the pavement thickness is controlled.

[0009]

The ultrasonic sensor measures the round-trip time at which the emitted ultrasonic wave propagates in the air and is reflected by the object to be measured.

[0010] The ultrasonic sensor is characterized by relatively high environmental resistance, relatively low cost, simple structure and easy handling. However, since ultrasonic waves use air as a propagation medium, propagation is affected by the density of air as the propagation medium. That is, the propagation speed changes with temperature and humidity.

The asphalt mixture, which is a pavement aggregate handled by the asphalt finisher, is heated to 100 ° C. or more and softened before use. Furthermore, water is sprinkled to cool the pavement surface after leveling. The sprayed water evaporates and cools the asphalt mix.

When the distance to a pavement surface is directly measured by an ultrasonic sensor, the ultrasonic sensor must be able to withstand high-temperature environments and also withstand water vapor.
Further, as described above, in the environment of the pavement work, the temperature of the air as the propagation medium greatly changes, and water vapor is generated. Therefore, it is inevitable that the propagation speed of the ultrasonic wave changes and the measurement accuracy greatly decreases. For this reason, it is necessary to devise a mounting position so as not to be provided on asphalt. Nevertheless, the accuracy is inevitably reduced, so the thickness of the pavement is increased to compensate.

The pavement thickness accuracy of a pavement road does not cause much problem if there is no step while maintaining a predetermined thickness. However, the pavement of roads, for example, tens of kilometers and hundreds of miles, is very wide. For this reason, paving unnecessarily thick is costly because of the increase in thickness, and the accumulated cost is enormous considering the entire construction.

Inspections after completion of construction are sampled at regular intervals to check the pavement thickness.
If the thickness of the pavement is not the predetermined value, the situation may be such that the entire surface is redone.

[0015] Therefore, in order to reduce the construction cost and more reliably secure a predetermined pavement thickness, it is preferable that the measurement of the pavement thickness be performed with high accuracy.

In view of the above circumstances, the present invention provides a pavement thickness control device capable of detecting a pavement thickness with high accuracy without being affected by a work environment and ensuring a predetermined pavement thickness without waste.
And an asphalt finisher provided with the pavement thickness control device.

[0017]

SUMMARY OF THE INVENTION The present invention relates to an asphalt finisher for adjusting the pavement thickness by changing the height and inclination of a screed provided at the rear of a vehicle body. Along,
A plurality of lightwave distance measurement devices provided at predetermined intervals, a pavement thickness is calculated from the difference in distance to the ground obtained from the lightwave distance measurement device, and the calculated pavement thickness is a predetermined value. The present invention relates to a pavement thickness control device for an asphalt finisher having a pavement thickness adjustment unit for adjusting the height and inclination of a screed, and the lightwave distance measuring device is provided at predetermined intervals along a traveling direction on both sides of the screed, The pavement thickness adjustment unit is related to a pavement thickness control device of an asphalt finisher that adjusts the height and inclination of the screed so that the pavement thickness on both sides of the screed becomes a predetermined value based on the measurement results of the lightwave distance measuring devices on both sides. Also, the present invention relates to a pavement thickness control device for an asphalt finisher provided with a blower that blows air along the optical axis of the lightwave distance measuring device, and the pavement thickness adjustment unit displays the pavement thickness. A display device, but according to the paving thickness control device for the asphalt finisher having a manual operation unit to adjust the height and inclination of the screed by a manual operation.

According to the present invention, there is provided an asphalt finisher for adjusting the thickness of a pavement by changing the height and inclination of a screed provided at the rear of a vehicle body. The asphalt finisher is provided at predetermined intervals along a running direction of the screed. A plurality of lightwave distance measuring devices, a traveling direction / distance detector for detecting a moving amount and a moving direction of the vehicle body with respect to the ground surface, a construction data storage device for storing a pavement thickness corresponding to a pavement point, The construction data of the pavement thickness for the position obtained from the distance detector is obtained from the construction data storage device, and the pavement thickness is calculated based on the distance measurement result of the lightwave distance measurement device, and the calculated pavement thickness becomes the construction data. The present invention relates to an asphalt finisher having a control device for adjusting the height and inclination of the screed as described above. In an asphalt finisher that adjusts the pavement thickness by changing the inclination, a plurality of lightwave distance measurement devices provided at predetermined intervals along the running direction of the screed, and provided for measuring the position of the vehicle body A GPS data device, a construction data storage device for storing a pavement thickness corresponding to a pavement point, and a pavement thickness construction data for a position measured by the GPS device are obtained from the construction data storage device. The present invention relates to an asphalt finisher having a control device that calculates a pavement thickness based on the distance measurement result of the above and adjusts the height and inclination of the screed so that the calculated pavement thickness becomes the construction data.

Further, the present invention comprises an asphalt finisher for adjusting the pavement thickness by changing the height and inclination of a screed provided at the rear of the vehicle body, and a tracking device for measuring the position of the asphalt finisher. A tracking device that collimates and tracks an object, a distance measuring angle measuring unit that measures a point of the object, and a transmitting unit that transmits position data measured by the distance measuring angle measuring unit. The asphalt finisher is arranged along a traveling direction of the screed, a plurality of lightwave distance measuring devices provided at predetermined intervals, a receiving unit for receiving transmission data from the tracking device, and a pavement point. A construction data storage device that stores construction data of the pavement thickness, and a pavement thickness calculated at the construction position from the measurement result of the lightwave distance measurement device, and the calculated pavement thickness is stored in the position data received by the receiving unit. A control device for adjusting the height and inclination of the screed so as to obtain the pavement thickness of the construction data in the data, and by changing the height and inclination of the screed provided at the rear of the vehicle body. It is composed of an asphalt finisher for adjusting the pavement thickness, and a tracking device for measuring the position of the asphalt finisher. A distance measuring angle unit, a construction data storage device for storing a pavement thickness corresponding to a pavement point, and a calculation unit for calculating the measurement result and the pavement thickness at the measurement point from the construction data storage device by the distance measuring angle unit. And a transmitting unit for transmitting data of the calculated pavement thickness, wherein the asphalt finisher includes a plurality of lights provided at predetermined intervals along a traveling direction of the screed. A distance measuring device, a receiving unit that receives data of the pavement thickness from the tracking device, and a pavement thickness calculated based on the measurement result of the lightwave distance measuring device, the pavement thickness of the data received by the receiving unit. And a control device for adjusting the height and inclination of the screed.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIGS. In FIGS. 1 to 5, the same components as those shown in FIG. 12 are denoted by the same reference numerals. Also, 1 in the figure
Reference numeral 3 denotes an asphalt mixture.

Leveling arms 4 are disposed on the left and right sides of the vehicle body 1, and the front ends of the leveling arms 4 are pivotally connected to rod ends of pivot cylinders 10, respectively.
It goes up and down by the expansion and contraction of. A frame 15 extending downward is provided at the rear end of the leveling arm 4, and the screed 3 is rotatably provided on the frame 15.
At the rear end of the upper surface of the leveling arm 4, a tilt setting cylinder 16 is pivotally supported.
7 is connected to the upper end of the screed 3, and the inclination of the screed 3 can be changed by the inclination setting cylinder 16.

A first lightwave distance measuring device 18 is provided on the vehicle body 1 so as to be located forward of the end where the asphalt mixture 13 is spread, and the asphalt mixture 13 behind the screed 3 is completely spread. A second lightwave distance measuring device 19 is provided on the vehicle body 1 so as to be positioned in the upright position. The first light wave distance measuring device 18 and the second light wave distance measuring device 19 respectively emit vertical distance measuring light, and the first light wave distance measuring device 18 and the second light wave distance measuring device 19 will be described later. Protection device 21
Is provided. In FIG. 1, reference numeral 22 denotes a display device.

An example of a light wave distance measuring device used in the first light wave distance measuring device 18 and the second light wave distance measuring device 19 will be described with reference to FIG. FIG. 3 shows a non-prism lightwave distance measuring device.

The optical system of the lightwave distance measuring device includes a light projecting unit 10
1. Distance measuring optical unit 102, light receiving unit 103, distance measuring circuit 104
The light projecting unit 101 further includes a semiconductor laser 105 that emits a laser beam as distance measuring light, and a lens 10 that emits a laser beam emitted from the semiconductor laser 105.
6. An optical expander 109 for making the optical fiber 108 incident on the optical fiber 108 by the lens 107, cell hoc lenses 112 and 113 for making the laser beam emitted from the optical fiber 108 enter the optical fiber 111, and the lens 106.
And a circular phase plate 114 provided between the lens 107 and
A mixing motor 115 for rotating the phase plate 114; and the phase plate 114, the mixing motor 115,
The cell hook lenses 112 and 113 are
6 is constituted.

The distance measuring optical unit 102 will be described.

A prism 117 and an objective lens 118 are provided on the distance measuring light input / output optical axis. The prism 117 reflects a laser beam emitted from the optical fiber 111 toward an object to be measured (ground surface). The distance measuring light 119 reflected by the prism 117 and passed through the objective lens 118 is emitted to the ground surface. The distance measuring light 119 is reflected on the ground surface, enters the lightwave distance measuring device through the objective lens 118, is reflected by the prism 117, and is incident on an optical fiber 126 of the light receiving unit 103 described later.

A split prism 121 is provided to face the prism 117. The splitting prism 121 has a light beam splitting surface 121a and a reflecting surface 121b. The light beam splitting surface 121a splits a part of the distance measuring light 119 emitted from the optical fiber 111 as an internal reference light 122. A circular light amount adjusting plate 123 is rotatably provided between the dividing prism 121 and the prism 117,
The light amount adjusting plate 123 is rotated and positioned by a light amount adjusting motor 124. The light amount adjusting plate 123 and the light amount adjusting motor 124
5 is constituted.

The split prism 1 of the prism 117
A split prism 127 is disposed on the opposite side to 21. The splitting prism 127 includes a light beam splitting surface 127a and a reflecting surface 127.
b, and the light beam splitting surface 127 a
The reflected distance measuring light 119 ′ reflected at 7 passes through and enters the optical fiber 126. A lens 128 and a lens 129 are provided between the reflection surface 121b and the reflection surface 127b.
The internal reference light 122 transmitted through the lens 128 and the lens 129 is reflected by the reflection surface 127b and the light beam splitting surface 127a, and is incident on the optical fiber 126.

A circular optical path switching plate 131 is provided between the prism 117, the lens 129 and the split prism 127.
Are provided so as to be freely rotatable, and two rotation positions of the optical path switching plate 131 are selected by an optical path switching motor 132. The optical path switching plate 131 and the optical path switching motor 132 constitute an optical path switching unit 136.

The light receiving unit 103 includes a condenser lens 133, 1
34, a light receiving element 135, and the reflected distance measuring light 119 'emitted from the optical fiber 126
The light is condensed on the light receiving element 135 by the light receiving elements 3 and 134 and is received by the light receiving element 135.

The distance measuring circuit 104 drives the semiconductor laser 105 to emit light, and calculates the distance to the ground based on a comparison with the distance measuring light 119 and the internal reference light 122 based on a light receiving signal from the light receiving element 135. .

Referring to FIG. 4, the protection device 21 will be described. Hereinafter, the protection device 21 provided in the first lightwave distance measuring device 18 will be described.

The first lightwave distance measuring device 18 accommodates at least an optical system and is provided with a protective cylinder 23 extending to near the ground surface. A blower 24 communicates with the upper end of the protective cylinder 23. When air is blown from the blower 24 into the protection cylinder 23, the inside of the protection cylinder 23 becomes a positive pressure with respect to the outside and forms an airflow going downstream. Out of the bottom of Therefore, dust, water vapor, and the like do not enter the protection tube 23, and the optical system of the first optical distance measuring device 18 is not contaminated by dust, water vapor, and the like. The air volume from the blower 24,
If the wind speed is sufficient, the protective cylinder 23 can be omitted.

FIG. 5 shows a control device according to the first embodiment.

The first lightwave distance measuring device 18 and the second lightwave distance measuring device 19 each measure the distance to the surface of the ground, and the measurement results are input to a control operation unit 26. For example, the pavement thickness is calculated, and the calculation result is displayed on the display device 22. Further, the first lightwave distance measuring device 1
8, the second lightwave distance measuring device 19 may be provided on the left and right of the vehicle body 1;
By performing a comparison operation on the deviation of the distance between the lightwave distance measuring devices 18 and 18 and the deviation of the distance between the second lightwave distance measuring devices 19 and 19, it is possible to measure the left and right inclination. The left and right inclinations are also displayed on the display device 22. The case where the inclination in the left-right direction is required is, for example, a case where a drainage gradient is provided.

The tilt of the screed 3 in the left and right directions may be controlled by independently operating the pivot cylinder 10 in the left and right directions, but the height of the suspension of the vehicle body 1 can be changed. And the vehicle body 1 itself may be inclined by a suspension.

The leveling arm 4 is supported by the pivot cylinder 10 via a support shaft 5 so as to be suspended. The pivot cylinder 10 has a manual switching valve 27
The supply of hydraulic oil to the pivot cylinder 10 is performed by operating the manual switching valve 27 via a hydraulic supply line (not shown). The pivot cylinder 10 may be a hydraulic cylinder, an electric cylinder, a linear motor, or a screw or nut rotated by a motor.

The display device 22 and the control operation unit 2
6. The manual switching valve 27, the pivot cylinder 10 and the like constitute a manual pavement thickness adjusting unit.

Hereinafter, control of the pavement thickness will be described.

When the drainage gradient is not provided, the left and right pivot cylinders 10 are arranged so that the screed 3 is horizontal.
The same control is performed for.

The pavement thickness is calculated from the distance measurement results of the first lightwave distance measuring device 18 and the second lightwave distance measuring device 19, and the pavement thickness is displayed on the display device 22. The operator operates the manual switching valve 27 while watching the pavement thickness displayed on the display device 22.

That is, when the displayed pavement thickness is smaller than the target value, the manual switching valve 27 is operated to raise the support shaft 5. When the support shaft 5 is raised, the leveling arm 4 is inclined, and the screed 3 is also inclined so that the front end of the lower surface is lifted. When the screed 3 is inclined, the screed 3 is pushed up by the asphalt mixture 13 supplied from a feeder (not shown) and rises. As the screed 3 rises, the inclination of the leveling arm 4 decreases, and the inclination of the lower surface of the screed 3 also decreases. When the lifting force received by the screed 3 and the weight of the screed 3 are balanced, the rising displacement of the screed 3 stops. That is, the pavement thickness increases.

When the displayed pavement thickness is larger than the target value, the manual switching valve 27 is operated to lower the support shaft 5. The effect opposite to that described above reduces the pavement thickness.

The tilt setting cylinder 16 changes the tilt of the screed 3 with respect to the leveling arm 4. Some asphalt mixes 13 may differ in specific gravity, elasticity, etc., or a pavement material other than the asphalt mix 13 may be used. In this case, by adjusting the inclination of the screed 3, the asphalt mixture is adjusted. By adjusting the lifting force of the screed 3 received from the mixture 13, even when the material of the asphalt mixture 13 is different, the manual switching valve 27 can be operated with the same feeling, and the work becomes easier. .

The first lightwave distance measuring device 18 and the second lightwave distance measuring device 19 may be provided on the leveling arm 4. In this case, an inclination sensor for detecting the inclination of the leveling arm 4 is provided. The horizontal distance between the first light wave distance measuring device 18 and the second light wave distance measuring device 19 is set to a known value, and the first light wave distance measuring device 1 in the horizontal posture of the leveling arm 4 is set.
8. If the height position of the second lightwave distance measuring device 19 is known,
The tilt angle of the leveling arm 4 measured by the tilt sensor, the first lightwave distance measuring device 18, the second lightwave distance measuring device 19
Can calculate the pavement thickness based on the measured distance to the ground surface.

The display device 22, the control operation section 26, the pivot cylinder 10, etc. constitute an automatic pavement thickness adjusting section.

The second embodiment will be described with reference to FIGS.

In the second embodiment, a traveling direction / distance detecting device 29 is provided on the vehicle body 1. The pivot cylinder 10 is driven via an electromagnetic switching valve 31, and the electromagnetic switching valve 31 is operated by a control signal from the control calculation unit 26. Although not particularly shown,
The manual switching valve 27 is also connected to the pivot cylinder 10 so that manual operation and automatic operation can be switched by a manual / automatic switch (not shown) or the like.

The traveling direction / distance detecting device 29 includes a sphere 30 which is in contact with the surface of the earth and is free to roll, a rotation detector (not shown) which is in contact with the sphere and detects rotational components of the sphere in two orthogonal directions. The direction of rotation of the sphere 30, ie, the body 1
And the amount of rotation of the sphere 30, that is, the moving distance of the vehicle body 1 are detected.

The traveling direction and the moving distance of the vehicle body 1 detected by the traveling direction / distance detecting device 29 are inputted to the control arithmetic section 26. The control operation unit 26 is provided with a construction data storage unit 32. The construction data defines, for example, the pavement thickness at each construction position.

Therefore, at the time of starting the pavement, the position of the vehicle body 1 at the pavement start point is input to the control arithmetic unit 26, and the detection result from the traveling direction / distance detecting device 29 is obtained in parallel with the pavement. If it is taken into the control calculation unit 26,
The construction position of the vehicle body 1 is obtained, and the pavement thickness at the construction position can be obtained from the construction data storage unit 32.

The control operation unit 26 obtains the pavement thickness obtained from the traveling direction / distance detecting device 29 and the distance measurement of the first lightwave distance measuring device 18 and the second lightwave distance measuring device 19 with respect to the construction position. By comparing the actual pavement thickness with the actual pavement thickness, the inclination and height adjustment amounts of the screed 3 are calculated, and a control signal is issued to the electromagnetic switching valve 31 based on the calculation result.
1 to drive the pivot cylinder 10. The driving of the pivot cylinder 10 changes the position of the support shaft 5 and corrects the height and inclination of the screed 3 via the leveling arm 4.

The construction data and the actual pavement thickness are successively displayed on the display device 22 so that the operator can check in what state the pavement work is progressing.

It is also possible for the operator to judge the construction environment based on the construction data, and to input correction data to the control arithmetic section 26 such as increasing or decreasing the pavement thickness or adjusting the drainage gradient. is there.

The traveling direction / distance detecting device 29 is not limited to the one that detects the rotation of the sphere 30, but intermittently takes in the image data of the ground surface, and executes the moving direction,
Various means such as a method for detecting the movement amount can be considered.

FIGS. 8 and 9 show a third embodiment.

In the third embodiment, a GPS device (global positioning system) is used as a means for detecting the position (construction position) of the vehicle body 1.

The GPS device receives a radio wave emitted from an artificial satellite to determine the position of the measurement point, and can measure the absolute position of the measurement point.

A pole 33 is erected at a required position of the vehicle body 1, preferably at a position of the screed 3, and a GPS device 34 is provided at an upper end of the pole 33.

The GPS device 34 receives radio waves from artificial satellites, and the position of reception is measured. The position signal obtained by the GPS device 34 is input to the control operation unit 26. The control arithmetic unit 26 fetches the pavement thickness at the construction position from the construction data storage unit 32, and reads the first lightwave distance measuring device 1
8. The actual pavement thickness of the pavement is calculated from the measurement result from the second lightwave distance measuring device 19, and the actual pavement thickness is compared with the pavement thickness of the construction data. A control signal is issued to the electromagnetic switching valve 31 to drive the pivot cylinder 10. When the pivot cylinder 10 is driven, the position of the support shaft 5 changes, and the leveling arm 4
The height and the inclination of the screed 3 are corrected via.

By using the GPS device 34, the absolute position of the vehicle body 1, that is, the construction position can be known. Therefore, as in the second embodiment, the position of the vehicle body 1 at the pavement start point at the time of starting pavement is determined. The operation of inputting to the control calculation unit 26 can be omitted.

FIG. 10 and FIG. 11 show a fourth embodiment.

In the fourth embodiment, the position (construction position) of the vehicle body 1 is detected by a tracking device (a surveying instrument having a tracking function) 35.

A pole 33 is erected on the vehicle body 1. The pole 33 is preferably located at the same position as the screed 3 on a plane.

The pole 33 is provided with a reflector 40 having a plurality of prisms having different directions so as to be able to reflect light rays from all directions. Further, a portion of the pole 33 extending upward from the reflector 40 is provided. A light receiving device 36 is provided.

The tracking device 35 is installed at a known point. The tracking device 35 includes a distance measuring and angle measuring unit that is a light wave distance meter, emits distance measuring light 37, collimates an object to be measured (the reflector 40 in the present embodiment), and adjusts the distance from the object to be measured. The reflected light is received and the distance between the tracking device 35 and the reflector 40 is measured.
It has a function that can measure the direction of 0. Therefore, the tracking device 35 measures the absolute position of the vehicle body 1 from the direction and distance of the reflector 40. Further, the tracking device 35 has a tracking unit that detects reflected light from the measurement target and tracks the measurement target based on the light receiving state of the detection light. 35 is the distance measuring light 3
The device itself changes its direction so that 7 is always emitted toward the reflector 40.

An arithmetic unit (not shown) provided in the tracking device 35 measures the absolute position of the reflector 40, that is, the vehicle body 1 (paving portion) from the known installation position and the distance measurement result. .

The tracking device 35 has a function of communicating the measured position of the reflector 40 to the vehicle body 1. The tracking device 35 has a light transmitting device 39, and the light transmitting device 39 is provided on the vehicle body 1 side by superimposing measurement data obtained by modulating the communication light 38 on the communication light 38. The light is emitted toward the light receiving device 36 provided.

The light receiving device 36 receives the communication light 38, converts it into an electric signal, and inputs the electric signal to the control operation unit 26. The control operation unit 26 separates and extracts measurement data from the communication light 38. The control operation unit 26 is provided with the communication light 3
The position of the vehicle body 1, that is, the construction position is acquired from the data separated from 8, and the pavement thickness, drainage slope, etc. corresponding to the construction position are acquired from the construction data storage unit 32. still,
The light transmitting device 39 transmits only the installation position of the tracking device 35 and the distance measurement result obtained by the tracking device 35, and only the direction data, and from these data, the control calculation unit 26 uses the vehicle body 1 (construction position). ) May be calculated.

From the measurement results from the first lightwave distance measuring device 18 and the second lightwave distance measuring device 19, the pavement thickness and inclination currently being paved are calculated, and the actual pavement thickness and inclination and the construction data storage section 32 are calculated. Compare the target pavement thickness and slope obtained from. As a result of comparing the actual pavement thickness with the target pavement thickness, if they do not agree with each other and the deviation exceeds an allowable range, the pivot cylinder 10 is operated via the electromagnetic switching valve 31 and the support shaft 5 The position is moved up and down, and the height and inclination of the screed 3 are adjusted so as to correct the deviation.

The measurement light may be superimposed on the distance measuring light 37, and the communication light 38 may be omitted.

The construction data storage unit 32 may be provided in the arithmetic unit of the tracking device 35. In this case, the arithmetic unit calculates the absolute position of the reflector 40 from the measurement result of the reflector 40, and further stores the target pavement thickness at the position (construction point) of the reflector 40 from the construction data storage unit 32. And the data of the pavement thickness is superimposed on the communication light 38 and transmitted to the light receiving device 36.

The control operation unit 26 obtains the target pavement thickness in real time via the light receiving device 36, and receives the target pavement thickness from the first lightwave distance measuring device 18 and the second lightwave distance measuring device 19. The pivot cylinder 10 is actuated via the electromagnetic switching valve 31 so as to compare the currently-paved pavement thickness obtained from the measurement result with the currently-paved pavement thickness to match the target value.

The data transmission / reception is not limited to optical communication, but may be wireless communication using radio waves.

[0076]

As described above, according to the present invention, at least one side of the screed is provided in an asphalt finisher for adjusting the pavement thickness by changing the height and inclination of a screed provided at the rear of the vehicle body. Along the direction, a plurality of lightwave distance measurement devices provided at predetermined intervals, and a pavement thickness is calculated from a difference in distance to the ground obtained from the lightwave distance measurement device, and the calculated pavement thickness is a predetermined value. The height and inclination of the screed are adjusted so that the pavement thickness can be detected with high accuracy without being affected by the working environment, and the predetermined pavement thickness can be ensured without waste. It has an excellent effect.

Further, the present invention further includes construction position detecting means such as a traveling direction / distance detector, a GPS device, and a tracking device, and also includes construction data of the pavement thickness corresponding to the construction position. This makes it possible to reduce the burden on the operator and to achieve a stable and accurate pavement thickness.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a main part of the first embodiment.

FIG. 3 is an explanatory diagram of an optical system of the lightwave distance measuring device used in the first embodiment.

FIG. 4 is an explanatory diagram of a protection device used in the first embodiment.

FIG. 5 is a control block diagram of the first embodiment.

FIG. 6 is a side view showing a second embodiment of the present invention.

FIG. 7 is a control block diagram of the second embodiment.

FIG. 8 is a side view showing a third embodiment of the present invention.

FIG. 9 is a control block diagram according to the third embodiment.

FIG. 10 is a side view showing a fourth embodiment of the present invention.

FIG. 11 is a control block diagram according to the fourth embodiment.

FIG. 12 is a side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 3 Screed 4 Leveling arm 5 Support shaft 10 Pivot cylinder 18 1st light wave distance measuring device 19 2nd light wave distance measuring device 21 Protective device 22 Display device 26 Control arithmetic unit 27 Manual switching valve 29 Traveling direction / distance detecting device 31 Electromagnetic Switching valve 32 Construction data storage unit 34 GPS device 35 Tracking device 36 Light receiving device 39 Light transmitting device 40 Reflector

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D052 AA03 AB01 AC01 BD03 BD14 CA01 DA14 2F069 AA06 AA71 BB24 GG01 GG21 5J062 BB08 CC07 DD12 DD21 5J084 AA05 AA06 AB16 AC07 AD01 BA04 BA36 BA51 BB01 BB11 DA01 EA04

Claims (8)

[Claims] 1. An asphalt finisher for adjusting a pavement thickness by changing the height and inclination of a screed provided at the rear of a vehicle body, wherein the asphalt finisher is provided at predetermined intervals along a running direction of at least one side of the screed. A plurality of lightwave distance measuring devices, and calculate the pavement thickness from the difference in the distance to the ground obtained from the lightwave distance measurement device, the height of the screed so that the calculated pavement thickness becomes a predetermined value and A pavement thickness control device for an asphalt finisher, comprising a pavement thickness adjustment unit for adjusting an inclination. 2. The light wave distance measuring device is provided at predetermined intervals along a traveling direction on both sides of the screed, and the pavement thickness adjusting section is provided on both sides of the screed based on the measurement results of the light wave distance measuring devices on both sides. The pavement thickness control device for an asphalt finisher according to claim 1, wherein the height and inclination of the screed are adjusted so that the thickness becomes a predetermined value. 3. A pavement thickness control device for an asphalt finisher according to claim 1, further comprising a blower for blowing air along the optical axis of said lightwave distance measuring device. 4. A pavement thickness control device for an asphalt finisher according to claim 1, wherein said pavement thickness adjustment unit includes a display device for displaying the pavement thickness, and a manual operation unit for adjusting the height and inclination of the screed by manual operation. . 5. An asphalt finisher for adjusting a pavement thickness by changing the height and inclination of a screed provided at the rear of a vehicle body, wherein a plurality of screeds are provided at predetermined intervals along a running direction of the screed. A light wave distance measuring device, a traveling direction / distance detector for detecting a moving amount and a moving direction of the vehicle body with respect to the ground surface, a construction data storage device for storing a pavement thickness corresponding to a pavement point, and the traveling direction / distance detector The construction data of the pavement thickness for the position obtained from is obtained from the construction data storage device, and the pavement thickness is calculated based on the distance measurement result of the optical distance measuring device, and the calculated pavement thickness becomes the construction data. An asphalt finisher comprising a control device for adjusting the height and inclination of a screed. 6. An asphalt finisher for adjusting a pavement thickness by changing the height and inclination of a screed provided at the rear of a vehicle body, wherein a plurality of screeds are provided at predetermined intervals along a running direction of the screed. A lightwave distance measuring device and a G provided for measuring the position of the vehicle body.
A PS device, a construction data storage device for storing a pavement thickness corresponding to a pavement point, and construction data of the pavement thickness for the position measured by the GPS device from the construction data storage device. An asphalt finisher comprising: a control device that calculates a pavement thickness based on a distance result and adjusts a height and an inclination of the screed so that the calculated pavement thickness becomes the construction data. 7. An asphalt finisher for adjusting a pavement thickness by changing the height and inclination of a screed provided at the rear of the vehicle body, and a tracking device for measuring the position of the asphalt finisher, wherein the tracking device is provided on the vehicle body. A tracking device for collimating and tracking the target, a distance measuring and angle measuring unit for measuring a point of the object, and a transmitting unit for transmitting position data measured by the distance measuring and angle measuring unit, wherein the asphalt The finisher has a plurality of lightwave distance measuring devices provided at predetermined intervals along a traveling direction of the screed, a receiving unit for receiving transmission data from the tracking device, and a pavement thickness corresponding to a pavement point. A construction data storage device that stores construction data, and calculates a pavement thickness at a construction position from a measurement result of the lightwave distance measuring device, and the calculated pavement thickness is constructed with the position data received by the receiving unit. A control device for adjusting the height and inclination of the screed so as to obtain the data pavement thickness. 8. An asphalt finisher for adjusting the thickness of a pavement by changing the height and inclination of a screed provided at the rear of the vehicle body, and a tracking device for measuring the position of the asphalt finisher. The tracking device is provided on the vehicle body. A tracking device for collimating and tracking a target object, a distance measuring angle measuring unit for measuring a point of the object, a construction data storage device for storing a pavement thickness corresponding to a point to be paved, and the distance measuring angle measuring unit An arithmetic unit that calculates the pavement thickness at the measurement point from the measurement result and the construction data storage device, and a transmission unit that transmits the calculated pavement thickness data, wherein the asphalt finisher is arranged in the running direction of the screed. A plurality of lightwave distance measuring devices provided at predetermined intervals along the distance, a receiving unit for receiving data of the pavement thickness from the tracking device, and a measurement result of the lightwave distance measuring device. And a controller for adjusting the height and inclination of the screed so that the calculated pavement thickness becomes the pavement thickness of the data received by the receiving unit.