JPH0551722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a road surface regeneration device used in the Remix method, which is one of the asphalt pavement repair methods.

[Prior art] As a road surface regeneration device, recycled material that has been scraped up in advance is carried up by an auger and a conveyor and temporarily stored in a recycled material surge bin, and this recycled material and the recycled material are transported from a hopper to a new material surge bin and stored. The new asphalt mixture (hereinafter referred to as new material) was added to a heating mixer equipped with rotating stirring blades in a fixed cylinder at a predetermined ratio by adjusting the opening of the dampers provided in both surge bins. It is known to mix while heating and discharge the recycled mixture onto the road surface and spread it with a screed (Utility Model Publication No. 106511/1983).

In addition, the recycled material scraped by a rotary califlier is placed in a heating furnace, and while being transferred by a bar feeder chain, it is agitated with 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] The heating mixer of the former road surface regeneration device and the heating furnace and mixer of the latter regeneration device are both fixedly installed on the traveling vehicle and are used to clean the road surface together with the traveling vehicle. Since it tilts according to the slope, the heating and mixing performance changes on uphill and downhill slopes, which has the disadvantage of adversely affecting the repaired pavement.

In addition, the latter recycling equipment does not have a measuring device for recycled materials, etc., while the former recycling equipment determines the mixing ratio of recycled materials and new materials by adjusting the opening of dampers installed in both surge bins. , it is not possible to accurately measure the amount of recycled materials, etc.

The present invention provides for roads where the heating performance of the heating device and the mixing performance of the mixer are constant without changing depending on the inclination of the road surface, and moreover, it is possible to accurately measure recycled materials and perform good repair pavement. The purpose is to provide a surface layer regeneration device.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a road surface layer in which new material and recycled material scraped by scarifier are mixed in a mixer, discharged onto the road surface, and spread evenly with a screed. In the regeneration device, a horizontal holding frame is provided on a traveling vehicle so as to be rotatable up and down on a pivot;
an inclination sensor that detects the inclination of the horizontal holding frame; a horizontal holding actuator that operates according to the detection data of this inclination sensor to keep the horizontal holding frame horizontal; A heating device that heats the recycled material to a specified temperature, a recycled material surge bin that stores the recycled material that has been heated to a specified temperature by this heating device, and a new storage bin that stores new material to be mixed with the recycled material. The mixer, which is equipped with a material surge bin and receives and mixes recycled material and new material individually from the recycled material surge bin and the new material surge bin, is supported by the horizontal holding frame via a weight scale.

[Function] The horizontal holding actuator operates according to the detection data of the inclination sensor, and always keeps the horizontal holding frame horizontal. Therefore, even if the inclination angle of the road surface changes, the heating device and the mixer maintain a predetermined posture, and the heating performance and mixing performance do not change.

Furthermore, since the recycled materials are placed in a mixer and weighed using a weighing scale, they can be weighed accurately, and the mixer also serves as a measuring container, making it possible to reduce the size and weight of the entire product.

[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 is elongated 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 portion as drive sources for a traveling device and various work devices. Further, the traveling vehicle A can freely travel and transport work, and is equipped with a hopper 10 at the front end of the vehicle to receive new material from a dump truck running in front of it. 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. Further, as a matter of course, the rotary scarifier ears 20 and 21 can be adjusted in position in the vertical direction by a hydraulic cylinder (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 califiers 20 and 21,
The measured value signal is input to an arithmetic unit built into the control device. Then, a 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 the 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. Then, between the rotary carificer 20, 21 and the rotary drum heater 50, the recycled material scraped up by the rotary carificer 20, 21 is taken up and placed between the rotary drum heater 5.
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 is formed to have a large diameter near the exit on the rear side, 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. It is configured. In addition, what is indicated by the reference numeral 56 is the drum 5.
This is an exhaust pipe provided at the exit of the rotary drum 51, and the exhaust gas inside the rotary 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 body 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. For this purpose, the horizontal holding frame 40 is swingably supported at its front end with respect to the traveling vehicle A by a pin (pivot) P2, as shown in FIG. and,
A tilt sensor 41 is provided at the rear, and the horizontal retaining frame 40 is maintained horizontally by automatically controlling a hydraulic cylinder (horizontal retaining actuator) 42 according to the detection data of the tilt sensor 41. It's summery.

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 consists of a mixing container 60A that also serves as a measuring container, a pair of stirring blades 60B, and a drive device (not shown) that drives the stirring blades 60B.
It is suspended and supported in a well-balanced manner from the horizontal holding frame (support frame) 40 via a plurality of load cells (weight scales) 61. pugmil mixer 60
The load cell 61 is configured to detect the weight of the contents in the mixing container 60A. In this case, since the plurality of load cells 61 are used for measurement, the sum of the detected values of all the load cells 61 becomes the measured value.

Moreover, an additive supply pipe (additive supply device) 62 for injecting additives into the pug mill mixer 60 is provided above the pug mill mixer 60, and this additive supply pipe 62 has an on-off valve (gate) not shown. is attached. Gates 14B and 23B of surge bins 14 and 23, on-off valves of additive supply pipe 62, and pug mill mixer 6
0, and the metering and mixing device 6 by the load cell 61.
5 is constructed so that new materials, recycled materials, and additives can be mixed and kneaded in a predetermined mixing ratio in a pugmill mixer 60.

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 manufactured by completing the mixing can be supplied to the road surface. Further, behind this 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 and compacted. A 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 second 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 0,21 is detected by the laser sensor 22.
, control the combustion and temperature of the burner 54 of the rotary drum heater 50 , control the inclination of the horizontal holding frame 40 that supports the rotary drum heater 50 , It controls the opening and closing of the gates 14B and 23B and the additive supply valve (not shown) and the opening and closing of the gate 64 of the pug mill mixer 60, and also takes in the measurement signal of the load cell 61 and controls the metering (mixing) of new materials and recycled materials. control of additive materials, etc.

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 suddenly, which is undesirable as it will impair quality stability. Therefore, in order to avoid sudden changes, the ratio of new material to recycled material is controlled to be changed 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.
Using this time delay, depending on the amount of recycled material,
Control is performed to gradually change the blending ratio step by step.

This will be explained in detail below.

The thickness of the road surface changes depending on the presence or absence of ruts and the degree of rutting. 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. Areas with ruts have fewer 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 the pavement to a constant thickness regardless of the rutted area or patching, add new material to the rutted area more than the non-rutted area, and It is necessary to reduce the amount of new material in the patching part.

Now, if the time delay mentioned above is about 5 minutes, mixer 60
Assume that it takes approximately 40 seconds to measure and mix the recycled material and new material and discharge it onto the road surface (until the change in the amount of scraped recycled material reaches the recycled material surge bin 23). The mixer 60 is about 7
The calculation results in mixing twice. ).

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 change. The ratio becomes 3:7, but as mentioned earlier, rutting is large only in limited sections, so the amount of recycled material scraped up usually returns to the original level 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, rapid changes in the blending ratio can be alleviated, and the width of the change can be kept narrow 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 heating power of the burner 54 is increased, and when the amount of scraping decreases, the heating 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 backwards, during which time it is heated to a specified temperature by hot air generated by the burner 54, dried, and falls onto the R second feeder 25. . Then, the surge bin 2 is fed by the R second feeder 25.
3, where the recycled materials are temporarily stored.

On the other hand, the new material is received by the hopper 10 from the dump truck running in front, carried to the rear by the V-first feeder 12, transferred to the V-second feeder 13 on the way, and finally sent to the new material surge bin 14. Can be stored.

The materials stored in these surge bins 14 and 23 are thrown into the pug mill mixer 60 by opening the lower gates 14B and 23B.
In this case, first, the gate 64 of the pug mill 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 according to an instruction from the control device, and the recycled material is supplied into the mixing container 60A of the pug mill mixer 60. On the other hand, the load cell 61 detects the weight and closes the gate 23B when the detected value reaches a preset value. 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 metering of the recycled material, the additive supply valve is opened and the additive is added. Finally, by opening and closing the gate 14B of the new material surge bin 14, the new material is measured and supplied into the mixing container 60A of the pug mill mixer 60 in the same manner as the regenerant.

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, it is possible to easily load the device 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.

In addition, although the above embodiment does not explain the means for controlling the amount of material held at the spreading screw 4, a leveler for measuring the amount of material held above the spreading screw 4 is not explained. It is also possible to provide control so that the holding amount is kept constant.

[Effects of the Invention] As explained above, the road surface regeneration device according to the present invention supports the heating device and the mixer on the horizontal holding frame that is always maintained in a horizontal state by the functions of the tilt sensor and the horizontal holding actuator. Even if the slope angle of the road surface changes,
The heating performance of the heating device and the mixing performance of the mixer do not change, so recycled material can always be heated in the same state, and recycled material and new material can be mixed. Also,
Recycled materials and the like are placed in a mixer and weighed directly with a weighing scale, so they can be weighed accurately. Therefore, irrespective of the slope of the road surface, the recycled material can be heated to a predetermined temperature, the recycled material and the new material can be mixed accurately at a predetermined mixing ratio, and good repair can be performed through stepwise control.

Furthermore, since the mixer has a structure that also serves as a weighing container, the overall size and weight can be reduced compared to the case where a weighing scale with a dedicated container is provided.

[Brief explanation of drawings]

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, 60A ... Mixing container, 60B ... Stirring blade, 61 ... Load cell, 65 ... Measuring and mixing device.

Claims (1)

[Claims] 1. In a road surface regeneration device that mixes new material and recycled material scraped up by the scarifier tires 20 and 21 in a mixer 60, discharges it onto the road surface, and spreads it out with a screed 5, the driving vehicle A rotates up and down about a pivot P2. A freely provided horizontal holding frame 40 and a tilt sensor 4 that detects the inclination of this horizontal holding frame 40.
1, a horizontal holding actuator 42 that operates according to the detection data of the tilt sensor 41 to keep the horizontal holding frame 40 horizontal, and the scarifier ears 20, 21 supported by the horizontal holding frame 40.
A heating device 50 raises the temperature of the recycled material scraped up by the heating device 50 to a specified temperature, a recycled material surge bin 23 that stores the recycled material heated to a specified temperature by the heating device 50, and a recycled material surge bin 23 that mixes the recycled material with the recycled material. The mixer 60, which receives and mixes recycled material and new material individually from the recycled material surge bin 23 and the new material surge bin 14, is installed in the horizontal holding frame 40. Weight scale 6
1. A road surface regeneration device characterized in that it is supported through a road surface regeneration device.