JPH0551721B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a road surface regeneration device used in asphalt-paved road repair methods, particularly the LIMITX method, and in particular, a method for measuring the amount of scraped recycled material. The present invention relates to a road surface regeneration device equipped with the device.

[Conventional technology] Conventionally, as a road surface regeneration device used in the Remix construction method, recycled material that has been scraped up in advance is carried up by an auger and a conveyor, temporarily stored in a recycled material surge bin, and this recycled material and new material are collected from a hopper. The new asphalt mixture transported and stored in the surge bin (hereinafter referred to as new material) is put into a heating mixer with rotating stirring blades in a fixed cylinder at a predetermined ratio, mixed while heating, and recycled. A method is known in which the mixture is discharged onto the road surface and spread out using a screed (Utility Model Application No. 106511/1983).

In addition, the recycled material scraped by a rotary carificer is placed in a heating furnace, transferred by a bar feeder chain, stirred by a stirring shaft and heated with hot air, and the recycled material and new material are mixed in a mixer and screed. It is also known that it is spread evenly with
No. 21114).

[Problems to be Solved by the Invention] By the way, the pavement thickness of the road surface changes depending on the presence or absence of ruts, the degree of ruts, etc. Rutting is caused by the friction of wheels against the paved surface, and is severe in areas such as intersections, interchanges, and service areas where brakes are often used to decelerate, stop, or accelerate.

As can be seen from this, rutting does not occur uniformly in the cross direction of the road surface, but occurs linearly in the longitudinal direction with an appropriate width. There are fewer areas with ruts than areas without.
On the other hand, in areas where a partial repair called patching has been performed, the amount of scraping increases in that area.

Therefore, in order to repair pavement with a constant thickness regardless of the presence or absence of ruts or patching, it is necessary to add more new material to areas with ruts than to areas without ruts, and to It is necessary to reduce the amount of new material in the patching part.

Both of the above two road surface regeneration devices adjust the amount of new material used depending on the amount of recycled material scraped up.
Since the structure is simply adjusted in accordance with the above, the blending ratio of recycled material and new material changes greatly in the longitudinal direction of the road surface, making it difficult to perform repairs uniformly.

Furthermore, both regeneration devices have a problem in that when the amount of recycled material changes from moment to moment, it is not possible to efficiently heat the recycled material with appropriate thermal power in response to this change.

In theory, the above-mentioned mixing ratio and heating adjustment can be done by an operator, but in reality it is extremely complicated and requires relying on intuition, so there is a limit to how much adjustment can be made. It is not possible to narrow the range of variation in the mixing ratio of recycled material and new material, and to heat the recycled material efficiently to perform good repairs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a road surface regeneration device that can narrow the range of change in the mixing ratio of recycled material and new material, and can efficiently heat the recycled material to perform good repairs.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a scarifier for scraping the pavement of a road surface, and a burner's hot air for recycling material scraped by the scarifier and carried by a feeder. a heating device that raises the temperature to a specified temperature by the heating device; a recycled material surge bin that stores the recycled material that has been heated to a specified temperature by the heating device;
A new material surge bin that stores new material brought from the hopper, a mixer that mixes recycled material and new material supplied individually from both of the surge bins at a set mixing ratio, and recycled material scraped up by the scarifier. The amount of recycled material is measured and the measured value signal is sent to the control device, and the fire power of the burner is controlled according to the measurement result of the amount of scraped up recycled material, and the set blending ratio of the recycled material and new material is controlled by the mixer. The traveling vehicle A is equipped with a device for measuring the amount of scraping that is changed stepwise for each batch mixing, and a leveling device that levels the recycled mixture discharged from the mixer.

[Function] The scraping amount measuring device measures the amount of recycled material scraped up by the scarifier, sends the measured value signal to the control device, and controls the heating device according to the measurement result of the scraped amount of recycled material. The firepower of the burner is controlled, and the set blending ratio of recycled material and new material is changed in stages for each batch mixing by a mixer.

Therefore, the recycled material can be heated efficiently and without any trouble with the firepower of the burner that corresponds to the amount of recycled material, and the range of change in the blending ratio of recycled material and new material can be narrowed.

[Example] Hereinafter, an example of the road surface regeneration device of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, A is a running vehicle.
The traveling vehicle A has an elongated shape in the front and back direction, has a total of four wheels 1 on the front, rear, left and right sides, and has two engines 2 mounted in the front as drive sources for a traveling device and various work devices. In addition, traveling vehicle A can freely travel and transport work,
At the very front, there is a hopper 10 that receives new material from the dump truck that runs all the way through. This hopper 10 is arranged at a low position, and a push roller 11 for pushing a dump truck is attached to the front end of the hopper 10.

Furthermore, a V-first feeder 12 is disposed at the center of the front of the traveling vehicle A, extending rearward from the hopper 10 and transporting the material in the hopper 10 rearward. This V-first feeder 12 is raised from the hopper 10 located at a low position to the height of the driver's seat 3, and its rear end is located between the left and right driver's seats 3.

Behind this V-1 feeder 12, a V-2 feeder 13 to which V-1 feeder 12 transfers is separately arranged. The V second feeder 13 is
It extends from a position below the rear end of the first feeder 12 to the rear end of the traveling vehicle A, and the V-first feeder 1
The new material received from 2 can be transported to a new material surge bin 14 located at the rear end of the traveling vehicle A. This V second feeder 13 is installed almost horizontally above the traveling vehicle A,
At the bottom, various main equipment, which will be described later, is arranged. In addition, the above-mentioned V first feeder 12 and V second feeder
As the feeder 13, a bar feeder is used.

By the way, as mentioned above, the new material receiving hopper 10 and the push roller 11 are provided at a low position in the front part of the traveling vehicle A. Therefore, if this continues, when the device of the present invention is placed on a trailer,
These things get in the way. Therefore, in this device, the hopper 10, the push roller 11, and the V-first feeder 12 are mounted integrally on one frame 15, and the frame 15 is set at a fulcrum P1 near the rear end of the V-first feeder 12. The center can be lifted up and retracted using a hydraulic cylinder 16.

In addition, at the bottom of the traveling vehicle A, the front wheels 1
Rotary scarifiers 20 and 21 are arranged parallel to each other at the rear to scrape up the pavement of the road. The rotary carificer 20 on the front side is configured to be movable left and right depending on the road width, and the rotary carificer 21 on the rear side is fixedly provided at that position. These measures make it possible to maximize the necessary width of the road.

These rotary california ears 20, 21 are
Two road heaters running in front of this road surface regeneration device can scrape up the heated road surface, and the front and rear scarifiers 20 and 21 are set to rotate in opposite directions as shown by the arrows. has been done. This is to cancel out the reaction forces received when scraping up the road surface.

In addition, the rotary californiaers 20 and 21 are
It has screw-like blades on the outer periphery,
The twist direction of the blades is set opposite on the left and right sides,
Moving vehicle A collects material scraped up by rotating.
The structure is such that it is concentrated in the center of the area. Also, of course, rotary california 2
0 and 21 can be adjusted in the vertical direction by hydraulic cylinders (not shown), so that the scraping depth can be adjusted.

Rotary californiaer 20 with such a configuration
A laser sensor (scraping amount measurement device) is installed in front of the road surface to measure the shape of the road surface in the transverse direction.
22 are provided. This laser sensor 22
is provided to measure the amount of scraping by the rotary califliers 20 and 21,
The measured value signal is input to an arithmetic unit built into the control device. Then, the calculation device calculates the scraping volume from the value measured by the laser sensor 22, the scraping depth and scraping width, and the running speed of this device, and converts it into the corresponding weight. There is.

Further, behind the rotary carifiers 20 and 21, there is a rotating drum heater (heating device) 50 that heats the material scraped by the rotary carifiers 20 and 21 (hereinafter referred to as recycled material) to a specified temperature.
is arranged, and further behind it is a drum heater 5.
Recycled material surge bin 2 that stores recycled materials heated at 0
3 is placed. Between the rotary carificer 20, 21 and the rotary drum heater 50, the rotary carificer 20, 21 picks up the scraped recycled material and transfers it to the rotary drum heater 50.
An R first feeder 24 is provided between the outlet of the rotary drum heater 50 and the recycled material surge bin 23 to convey the recycled material heated by the drum heater 50 to the recycled material surge bin 23.
A second feeder 25 is provided.

As shown in FIGS. 3 and 4, the rotating drum heater 50 includes a rotating drum 51, a rotating mechanism 52 that rotates it, combustion chambers 53 provided on the left and right sides of the rotating drum 51, and a combustion chamber 53 provided in each combustion chamber 53. It is composed of a burner 54 provided and an air guide path 55 that guides hot air generated in the combustion chamber 53 to the inlet of the rotating drum 51, and the axis is set on the center line of the traveling vehicle body A in the longitudinal direction. It is arranged so that the axis line is inclined slightly downward from the horizontal as it goes towards the rear. Then, the drum 51 is rotated to gradually transport the contents backward using the inclination, and the temperature of the recycled material is raised by the hot air flowing inside.

Here, the rotary drum 51 has a large diameter near the exit on the rear side, and is configured so that a large amount of material can be stored in this part and a large amount of material can be dropped onto the R second feeder 25 and transported efficiently. has been done. Note that the reference numeral 56 indicates the drum 51.
This is an exhaust pipe provided at the outlet of the rotary drum 51, and the exhaust gas inside the rotating drum 51 can be discharged to the outside by a built-in axial flow fan.

The rotating drum heater 50 having such a structure is fixed on a horizontal holding frame 40 provided independently of the traveling vehicle A. The horizontal holding frame 40 is for keeping the inclination angle of the rotary drum heater 50 constant regardless of the inclination state of the traveling vehicle A, and is controlled to keep it absolutely horizontal. Therefore, as shown in FIG.
It is supported so that it can swing freely. A tilt sensor 41 is provided at the rear, and the tilt sensor 41
The horizontal holding frame 40 is kept horizontal by automatically controlling the hydraulic cylinder 42 according to the detected data.

Further, the two surge bins 14 and 23 for new material and recycled material described above are both arranged side by side and provided at a relatively high position. Further, as shown in FIG. 3, gates 14B and 23B are provided at the lower part thereof, respectively, which are opened and closed by hydraulic cylinders 14A and 23A. Incidentally, capacitive level sensors 14C and 23C are inserted into the surge bins 14 and 23, respectively.

At the lower position of these surge bins 14, 23,
A pug mill mixer 60 is arranged to mix the materials supplied from the surge bins 14 and 23. This pug mill mixer 60 also serves as a measuring device, and is suspended and supported from the horizontal holding frame 40 via a load cell 61. The weight of the contents in the pug milk mixer 60 can be measured using a load cell 61. Further, above the pug mill mixer 60, an additive supply pipe 62 for injecting additives into the pug mill mixer 60 is provided. A compounding device 65 is configured by the gates 14A and 23B of the surge bins 14 and 23, the pug mill mixer 60, the load cell 61, and the additive supply pipe 62.
Inside the machine, new materials, recycled materials, and additives can be mixed and kneaded in a predetermined ratio.

A gate 64 that is opened and closed by a hydraulic cylinder 63 is provided on the bottom of the pug mill mixer 60. This gate 64 opens toward the rear side of the traveling vehicle A, and by opening this gate 64, the regenerated mixture produced by completing the mixing can be supplied to the road surface. Further, behind the gate 64, a spreading screw 4 is arranged to spread the recycled mixture laterally, and further behind the spreading screw 4, the recycled mixture spread by the spreading screw 4 is spread. A hardening screed (leveling device) 5 is arranged.

Incidentally, the screed 5 is supported by a leveling arm 6 shown in FIG. 2 that is swingably provided with respect to the traveling vehicle body A, so that the thickness of the pavement can be adjusted.

Furthermore, as described above, the horizontal holding frame 40 is equipped with a rotary drum heater 50 and a pug mill mixer 60 that also serves as a metering mechanism, which must be maintained in a constant state regardless of the inclination state of the traveling vehicle A. However, in addition to the above, both surge bins 14 and 23, and a V second feeder 13 and an R third feeder 25 for carrying materials to the surge bins 14 and 23 are placed. These parts are swung together and held in a substantially constant position.

Further, a control device (not shown) is incorporated in this on-road surface regeneration device. The main role of this control device is as follows. Setting and controlling the traveling speed, rotary californiaer 2
The amount of scraping by 0 and 21 is detected by the laser sensor 22.
, perform fuel control and temperature control of the rotary drum heater 50 burner 54 , perform tilt control of the horizontal holding frame 40 that supports the rotary drum heater 50 , perform gate control of the surge bins 14 and 23 14B, 23B and the additive supply valve (not shown), and the gate 64 of the pug mill mixer 60, it also takes in the measurement signal of the load cell 61 and controls the metering (mixing) of new materials and recycled materials. This includes controlling the amount of additives.

Among these, the control device is configured so that the measurement result of the amount of scraping is particularly reflected in the content of the measurement (formulation). The reason for this is that if the amount of recycled material increases or decreases rapidly, the blending ratio with new material will change abruptly, which is undesirable because quality stability will be impaired. Therefore, in order to avoid sudden changes,
The ratio of new material to recycled material is controlled in stages. In this case, there is a time delay before the reclaimed material scraped up by the rotary carificers 20 and 21 reaches the surge bin 23 as it passes through the middle. By utilizing this time delay, control is performed to gradually change the blending ratio in stages according to the amount of recycled material.

I will explain in detail. Assume that the above time delay is approximately 5 minutes, and that the time required to measure and mix the recycled material and new material using the mixer 60 and discharge this onto the road surface is approximately 40 seconds. It is calculated that the mixer 60 mixes approximately seven times before the change in the raised amount reaches the recycled material surge bin 23.)

Under such operating conditions, for example, the recycled material "6" was scraped up at a rate of "6.1" per unit time, and the reclaimed material "6", which was slightly less than the scraped up amount, was mixed with the new material "4" for paving. (Excess recycled material gradually accumulates in the surge bin 23.) When a heavily rutted area is reached and the amount of scraped recycled material decreases to "3", the recycled material and new material in the mixer 60 are Change the next mixing ratio of materials from 6:4.
The blending ratio is changed stepwise to 5.5:4.5, and then to 5:5, and the amount of recycled material used is gradually reduced.

In the above example, since the amount of recycled material used is greater than the scraped up amount, the recycled material in the surge bin 23 gradually decreases, and if the scraped up amount of recycled material "3" continues for a long time, the blending ratio will eventually reach 3. :7, but as mentioned earlier, the rutting is large only in a limited section, so the amount of recycled material scraped up usually returns to its original value before the ratio reaches 3:7. When the amount of scraping increases due to patching, etc., the amount of recycled material used is increased in stages, contrary to the above. As a result,
It becomes possible to moderate sudden changes in the blending ratio and to suppress the range of changes to a narrow range to obtain a homogeneous regenerated mixture.

Furthermore, it is said that even if the amount of new material mixed in changes within a certain limited range, specifically within a range of about ±15%, it will not have a major effect on the quality of the pavement. For this reason,
The goal is to control the range of variation in the mixing ratio of recycled material and new material to within the above range.

Although the mixer 60 mixes the recycled material and the new material in batches, the screed 5 spreads the recycled mixture continuously by consuming the recycled mixture that has accumulated in front of the screed 5.

In addition, the measurement result of the amount of scraping is
It has come to be used in connection with the control of For example, control is performed such that when the amount of scraping increases, the thermal power of the burner 54 is increased, and when the amount of scraping decreases, the thermal power of the burner 54 is decreased.

The main control contents other than those mentioned above will be explained in the explanation of the operation.

Next, the operation of the road surface regeneration device configured as described above will be explained.

When actually performing road surface regeneration work, two road heaters run in front of this device to heat the road surface. In addition, a compaction roller runs behind this device, compacting the road surface.

While moving forward at a working speed, this device scrapes up the pre-heated pavement of the road surface using the rotary scarifiers 20 and 21. The scraped up material is fed into the drum heater 50 from the inlet of the rotary drum heater 50 by the R first feeder 24 as recycled material.

Next, as the drum 51 rotates, the recycled material gradually moves backward, and during this time the recycled material is raised to a specified temperature by the hot air generated by the burner 54, and falls onto the R second feeder 25. The recycled material is then transported to the surge bin 23 by the R second feeder 25, where it is temporarily stored. On the other hand, the new material is received by the hopper 10 from the dump truck running in front, and transported to the rear by the V-first feeder 12.
On the way, it is transferred to the V second feeder 13 and finally stored in the new material surge bin 14.

The materials stored in these surge bins 14 and 23 are thrown into the pug mill mixer 60 when the lower gates 14B and 24B are opened.
In this case, first, the gate 64 of the pugmill mixer 60
When the container is closed and empty, recycled material is added. That is, the gate 23B of the surge bin 23 is opened with support from the control device, and the recycled material is supplied into the pug mill mixer 60. On the other hand, load cell 6
1 detects the weight, and when the detected value reaches a preset value, closes the gate 23B. This completes the measurement of one batch of recycled material.

At almost the same time as the above measurement, the additive is separately measured using a measuring device (not shown). Then, following the amount of recycled material, the additive supply valve is opened and the additive is supplied. Finally, by controlling the opening and closing of the gate 14B of the new agent surge bin 14, the new material is measured and supplied into the pug mill mixer 60 in the same manner as the recycled material.

In this way, each material is sequentially measured in batches and simultaneously mixed by the pug mill mixer 60 for a predetermined period of time. When mixing for a predetermined period of time is completed, the gate 64 at the bottom of the pug mill mixer 60 is opened, and the regenerated mixture is supplied to the spreading screw 4. The regenerated mixture is then spread on the road surface, leveled with a screed 5, and compacted with subsequent compaction rollers. The road surface layer regeneration work is performed continuously through the above steps.

During this work, as the amount of scraping increases or decreases, the mixing ratio is automatically changed for each batch within a limited range in the manner described above, and paving is achieved without sudden changes in quality.

Furthermore, since the rotating drum heater 50 and the metering pug mill mixer 60 are always maintained in a constant posture even when the traveling vehicle A approaches the slope surface,
Demonstrate stable ability.

Furthermore, when loading the device onto the trailer after the work is completed, the device can be easily loaded without any trouble by lifting the hopper 10, etc., as shown by the two-dot chain line in Figure 2. can.

In the above embodiment, a road heater is run in front of this device to preheat the road surface and then scrape it up. However, the rotary scarifier 20, It is also possible to proceed with the work by scraping it up with 21.

[Effects of the Invention] As explained above, the present invention measures the amount of scraping of recycled material using a scraping amount measuring device, and mixes the set blending ratio of recycled material and new material based on the result. Since it is configured to change the mixture ratio step by step for each batch mixing, it is possible to avoid sudden changes in the mixture ratio and to keep the range of change in the mixture ratio narrow, resulting in good regeneration of the road surface layer with little change in quality. It can be performed.

In addition, since the burner firepower is controlled based on the above measurement results, the regenerant can be efficiently heated to an appropriate temperature, which is economical and prevents deterioration of the regenerant and blue smoke. The occurrence can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a side view showing the main parts of the embodiment, and FIG. 4 is a plan view of the same. A... Running vehicle, 14... New material surge bin, 1
4B...Gate, 20, 21...Rotary scarifier, 22...Laser sensor (scraping amount measuring device), 23...Recycled material surge bin, 23B
... Gate, 50 ... Rotating drum heater (heating device), 60 ... Pug mill mixer, 61 ... Load cell, 65 ... Blending device.

Claims (1)

[Claims] 1 Scarifier that stirs up the road surface 2
0, 21, a heating device 50 that heats the recycled material scraped up by the scarifiers 20, 21 and transported by the feeder 24 to a specified temperature using hot air from a burner 54; Recycled material surge bin 2 that stores recycled material heated to
3, a new material surge bin 14 for storing new material transported from the hopper 10, and both surge bins 2 mentioned above.
A mixer 60 mixes the recycled material and new material supplied individually from 3 and 14 at a set mixing ratio, and the amount of recycled material scraped up by the scarifiers 20 and 21 is measured and the measured value signal is controlled. The heat of the burner 54 is controlled according to the measurement result of the scraped up amount of recycled material, and the set blending ratio of the recycled material and new material is changed in stages for each batch mixing by the mixer 60. A road surface layer having a pavement scraping amount measuring device characterized in that a traveling vehicle A is equipped with a scraping amount measuring device 22 and a leveling device 5 for leveling the recycled mixture discharged from the mixer 60. playback device.