JPH0559209B2 - - 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.

[Conventional technology] 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 recycled asphalt mixture (hereinafter referred to as new material) is placed at a predetermined ratio into a heating mixer equipped with rotating stirring blades in a fixed cylinder, mixed while heating, and the recycled mixture is discharged onto the road surface. It is known to level the floor 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] Both of the above two on-road surface regeneration devices have a structure in which the recycled material is moved to the bottom of a fixed furnace, stirred with rotating stirring blades or a stirring shaft, and heated with hot air. Because of this, the stirring performance is poor and the recycled material cannot be heated uniformly. In addition, the heating mixer of the former road surface regeneration device and the heating furnace of the latter regeneration device are both fixedly installed on the traveling vehicle and tilt along with the vehicle, so it is difficult to climb uphill. When going downhill, the heating performance changes, which has an inconvenient effect on the repaired pavement.

Furthermore, both recycling devices are unable to respond accurately to situations where the amount of recycled material changes from moment to moment, making it impossible to efficiently heat the recycled material with appropriate thermal power. As a result, a small amount of recycled material may be heated with strong heat, causing deterioration of the recycled material and blue smoke, or a large amount of recycled material may be heated with low power and it may not be possible to raise the temperature to the specified temperature. There are some easy drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a road surface regeneration device that can uniformly and efficiently heat the regenerated material regardless of the slope of the road surface to perform good repair.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a road surface regeneration device that mixes new material and recycled material scraped by a scarifier in a mixer and discharges the mixture onto the road surface. A horizontal holding frame is provided on a traveling vehicle so that it can rotate up and down on a pivot, a tilt sensor detects the inclination of this horizontal holding frame, and it operates according to the detection data of this tilt sensor to keep the horizontal holding frame horizontal. The recycled material scraped by the horizontal holding actuator and the scarifier ear supported by the horizontal holding frame is received by a rotating drum rotated by a rotating mechanism, and heated to a specified temperature by hot air from a burner. a heating device, a recycled material surge bin that is supported by the horizontal holding frame and stores the recycled material heated to a specified temperature by the heating device, and a recycled material surge bin that is supported by the horizontal holding frame and stores new material to be mixed with the recycled material. A scraper that measures the amount of recycled material scraped by the new material surge bin and the scarifier ear, sends the measured value signal to a control device, and controls the firepower of the burner according to the measurement result of the scraped amount of recycled material. The mixer is equipped with a loosening amount measuring device and receives and mixes recycled material and new material individually from the recycled material surge bin and the new material surge bin, and the mixer is supported on 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, both surge bins, and the mixer maintain predetermined postures, and heating performance and mixing performance do not change.

In addition, since the recycled materials are placed in a mixer and weighed using a weighing scale, they can be accurately weighed, and since the mixer also serves as a weighing container, the entire system can be made smaller and weighed.

In addition, the scraping amount measuring device measures the amount of recycled material scraped by the scarifier, sends the measured value signal to the control device, and depending on the measurement result of the scraping amount of the recycled material, the burner of the heating device is activated. Since the thermal power of the burner is controlled, the recycled material can be heated efficiently and without any trouble with the thermal power of the burner that corresponds to the amount of recycled material.

[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 is capable of freely traveling and transporting work, and is equipped with a hopper 10 at the front end thereof to receive new material from a dump truck running in front. 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 arranged at the center of the front of the traveling vehicle A, extending rearward from the hopper 10 and for carrying the material in the hopper 10 rearward. This first feeder 12 is raised from the hopper 10 located at a low position to near 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 that transfers from the V-1 feeder 12 via an intermediate feeder 17 is separately arranged.
The V second feeder 13 extends from one end of the intermediate feeder 17 to the rear end of the traveling vehicle A, and transfers the new material received from the V first feeder 12 via the intermediate feeder 17 to the rear end of the traveling vehicle A. The new material can be transported to a new material surge bin 14 located in the section. This V second feeder 13 is installed almost horizontally above the traveling vehicle A. Note that the V-first feeder 12, the intermediate feeder 17, and the V-second feeder 13 each include a bar feeder, and constitute a new material transfer device.

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 left as is, these will become a hindrance when the device of the present invention is placed on a trailer for moving from the construction site to another location. Therefore, in this device, in order to raise the front overhang upward, the hopper 10, the push roller 11, and the V-first feeder 12 are integrally mounted on one frame 15, and this frame 15 is attached to the V-first feeder 12. It is preferable that it be able to be lifted upward and retracted using a hydraulic cylinder (not shown) about a fulcrum near the rear end.

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 to loosen the pavement on the road surface at the rear side. 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 allow the necessary width of the road to be made as wide as possible.

These rotary california ears 20, 21 are
Two road heaters running in front of this road surface regeneration device can scrape 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 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,
Vehicle A that rotates and loosens the material
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 depth of loosening can be adjusted.

Rotary californiaer 20 with such a configuration
A laser sensor (scratching 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 loosening by the rotary califliers 20 and 21,
The measured value signal is input to an arithmetic unit built into the control device. Then, the arithmetic device calculates the loosening volume from the value measured by the laser sensor 22, the loosening depth and width, and the running speed of this device, and converts it into the corresponding weight. There is.

Further, behind the rotary carificer 20, 21, there is a rotating drum heater (heating device) 50 that heats the material scraped by the rotary carificer 20, 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 are arranged next to the new material surge bin 14. And rotary california 2
0 and 21 and the rotary drum heater 50, there is an R first feeder 24 that constitutes a transfer device that picks up the recycled material scraped by the rotary carificers 20 and 21 and conveys it to the inlet of the rotary drum heater 50. A drum heater 5 is provided between the outlet of the rotating drum heater 50 and the recycled material surge bin 23.
An R second feeder 25 is provided which carries the recycled material heated to 0 to the recycled material surge bin 23.

As shown in FIGS. 3 and 4, the rotating drum heater 50 includes a cylindrical rotating drum 51, a rotating mechanism 52 that rotates the rotating drum 51, and a combustion chamber 53 provided next to the rotating drum 51. (omitted in Figure 1) and combustion chamber 53
It consists of a burner (hot air supply mechanism) 54 provided in the combustion chamber 53, and an air guide path 55 that guides the hot air generated in the combustion chamber 53 to the inlet 51A of the rotating drum 51.

In this case, the rotating drum 51 is arranged on the center line of the traveling vehicle A, with its axis oriented in the front-rear direction, and furthermore, the axis is inclined slightly downward from the horizontal toward the rear. Further, a plurality of scraping blades 51B are provided on the inner circumferential wall of the rotating drum 51 and are arranged at equal intervals in the circumferential direction, so that the recycled material inside can be scraped up as the drum 51 rotates. It's becoming like that.

Further, the rotation mechanism 52 includes four rotation support rollers 52 on the front, rear, left and right sides that rotatably support the drum 51.
A, four displacement prevention rollers 52B that support the inclined drum 51 so that it does not shift along the inclination, a driving hydraulic motor (not shown), and a sprocket 52 provided on the output shaft of the hydraulic motor.
C and a sprocket 52D formed on the outer periphery of the rotating drum 51.
It is composed of and.

Further, the combustion chamber 53 and the air guide path 55 are integrally constructed, and the air guide path 55 is connected to the drum 5.
It is arranged in communication with the front entrance 51A of 1. The rotary drum heater 50 rotates the drum 51 and introduces the recycled material from the inlet 51A, thereby gradually transporting the recycled material to the rear of the vehicle A using the inclination, and using hot air to circulate inside. It is configured to raise the temperature of the recycled material.

Here, the rotary drum 51 has a large diameter near the exit on the rear side, and a large amount of recycled material is stored in this part. The construction is such that materials can be dropped down and transported efficiently. Note that the reference numeral 56 indicates an exhaust pipe provided at the outlet of the drum 51, and the exhaust gas inside the rotating drum 51 can be discharged to the outside by a built-in axial 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 maintaining the inclination angle of the rotary drum heater 50 at a constant attitude regardless of the inclination state of the traveling vehicle A, and is controlled so as to maintain the inclination angle horizontally.
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) P, 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. 5, 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.

Surge bins 14, 23 at the rear of traveling vehicle A
A pug mill mixer (mixing device) 60 for mixing the materials supplied from the surge bins 14 and 23 is provided below the hopper 70 of the asphalt finisher B, forming an insertion gap G for the hopper 70 of the asphalt finisher B.
This pug mill mixer 60 also serves as a measuring device,
It is suspended and supported from the horizontal holding frame 40 via a load cell (weight scale) 61. and,
It is configured such that the weight of the contents in the pug mill mixer 60 can be measured by a load cell 61. Moreover, an additive supply pipe 62 for injecting additives into the pug mill mixer 60 is provided above the pug mill mixer 60. And surge bin 1
A compounding device is constituted by gates 14B and 23B of 4 and 23, a pug mill mixer 60, a load cell 61, and an additive supply pipe 62, and new material, recycled material, and additives are mixed in a predetermined mixing ratio in the pug mill mixer 60. It is now possible to knead and mix.

A gate 64 that is opened and closed by a hydraulic cylinder 63 is provided on the bottom of the pug mill mixer 60. By opening this gate 64, the recycled mixture produced after finishing the mixing is inserted into the gap G below the pug mill mixer 60 into the hopper 70 of the asphalt finisher B, which is a separate device.
can be supplied to

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 loosening by 0,21 is measured 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 additives, etc.

Among these, the control device is configured so that the measurement result of the loosening amount 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 lag before the recycled material loosened 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 used to decelerate or stop vehicles, or where heating is common.

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.
Conversely, where a partial repair called patching has been performed, the amount of loosening will be greater 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 them 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 at a rate of "6.1" per unit time, and the recycled material "6", which was slightly less than the loosened amount, was mixed with the new material "4" for paving. (Excess recycled material gradually accumulates in the surge bin 23.) When the amount of scraped recycled material decreases to "3" in a heavily rutted area, the recycled material and new material in the mixer 60 are mixed. 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 amount of loosening, the amount of recycled material in the surge bin 23 gradually decreases, and if the loosening 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 loosened usually returns to its original level before the ratio reaches 3:7. . When the amount of loosening 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.

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

In fact, when performing road surface regeneration work, two road heaters usually run in front of this device to heat the road surface. Further, an asphalt finisher B runs after this device, inserting a hopper 70 into a gap G formed under the pug mill mixer 60, and compacts the road surface.

While moving forward at a working speed, this device uses rotary scarifiers 20 and 21 to loosen the pre-heated pavement of the road surface. The scraped 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, the recycled material put into the inside of the drum 51 is scraped up by the scraping blades 51 as the drum 51 rotates.
It is scraped up by B and reaches near the top of the drum 51, and then falls freely from above. As this operation is repeated, the temperature of the recycled material is efficiently and evenly raised by the hot air supplied into the drum 51. In addition, since the drum 51 is tilted backward with a predetermined accuracy, the falling point of the recycled material gradually moves to the rear side of the traveling vehicle as the free fall is repeated, and the recycled material inside the drum 51 is tilted backwards. Proceed to and fall onto the R second feeder 25. Then, the surge bin 23 is
The recycled materials are transported to and temporarily stored here.

On the other hand, the new material is received by the hopper 10 from the dump truck running in front, transported to the intermediate feeder 17 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. It is stored in 14.

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 pug mill mixer 60. On the other hand, load cell 6
1 detects the weight, and when the detected amount 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 metering of the recycled material, the additive supply valve is opened and the additive is added. Finally, new material surge bin 14
By controlling the opening and closing of the gate 14B, 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 pugmill mixer 60 for a predetermined period of time. When the 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 hopper 70 of the asphalt finisher B that follows.
The recycled mixture is then spread over the road surface, leveled with a screed, and compacted. 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. In addition, the rotating drum heater 5
The pug mill mixer 60 for weighing and weighing is always maintained in a constant posture even if the traveling vehicle A approaches the slope surface, so it exhibits stable performance.

Further, when loading the apparatus onto the trailer after the work is completed, the apparatus can be easily loaded without any trouble by lifting the hopper 10 and the like.

In addition, according to the above-mentioned method, the preheated road surface is scraped and the material is heated by the rotating drum heater 50, which has the effect of preventing the generation of so-called blue smoke.

Further, in the above embodiment, the exhaust pipe 56 of the rotary drum heater 50 is directed upward to release the exhaust gas into the upper space, but the exhaust gas may be sprayed onto the road surface after the scraping is completed. . This prevents the temperature of the scraped surface from decreasing and softens the asphalt-containing fine powder remaining on the scraped surface, thereby improving the adhesion with the recycled mixture to be laid next. I can do it.

Furthermore, in the above embodiment, a case has been described in which a road heater is run in front of this device to heat the road surface in advance and then scrape the road surface. It is also possible to proceed with the work by loosening with 21. In that case, there is a risk of blue smoke occurring during heating, so to prevent this, preheating is performed at the R first feeder 24,
It is desirable that the heating temperature be raised in two stages.

Furthermore, although the illustrated structure is such that the regenerated mixture mixed by the pug mill mixer 60 is dropped onto the hopper of the asphalt finisher, it may be constructed such that it is transported into the hopper of the asphalt finisher by an appropriate transport means. You can also do it.

[Effects of the Invention] As explained above, the road surface regeneration device according to the present invention applies the recycled material to the horizontal holding frame which is always maintained in a horizontal state by the functions of the inclination sensor and the horizontal holding actuator, by the rotation of the rotating drum. The structure supports the heating device that stirs and heats the material, both surge bins, and the mixer, so the entire recycled material can be stirred quickly and efficiently, and even if the slope angle of the road surface changes, the heating device The heating performance of the mixer and the mixing performance of the mixer do not change, and the recycled material can always be heated and mixed in the same state.

In addition, 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 weighing container, making it possible to reduce the overall size and weight.

In addition, the structure is such that the amount of loosening of the recycled material is measured by the loosening amount measuring device, and the firepower of the burner is controlled based on the measurement result.
It is possible to efficiently heat the recycled material to an appropriate temperature, which is economical, and also suppresses the deterioration of the recycled material and the generation of blue smoke.

[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 of the heating device, Fig. 4 is a sectional view of the same, Fig. 5 is a side view of the surge bin, and Fig. 5 is a side view of the surge bin. FIG. 6 is a partially cutaway front view of the device. A... Running vehicle, 10... Hopper, 12,1
3, 17... Feeder, 20, 21... Rotary calf eye, 24... Feeder, 50... Rotating drum heater (heating device), 51... Rotating drum, 51B... Scraping blade, 52... Rotating Mechanism, 53... Combustion chamber, 54... Burner, 5
5... Air guide path, 60... Pug mill mixer (mixing device).

Claims (1)

[Claims] 1 In a road surface regeneration device that mixes new material and recycled material scraped by scarifiers 20 and 21 in a mixer 60 and discharges the mixture onto the road surface, a horizontal A holding frame 40, a tilt sensor 41 that detects the tilt of this horizontal holding frame 40, and this tilt sensor 4.
a horizontal holding actuator 42 that operates according to the detection data of 1 and keeps the horizontal holding frame 40 horizontal;
Then, the recycled material supported by the horizontal holding frame 40 and scraped by the scarifier ears 20 and 21 is received by a rotating drum 51 rotated by a rotating mechanism 52, and heated to a specified temperature by hot air from a burner 54. A heating device 50 for heating, a recycled material surge bin 23 that is supported by the horizontal holding frame 40 and stores the recycled material heated to a specified temperature by the heating device 50, and a recycled material surge bin 23 that is supported by the horizontal holding frame 40 and mixed with the recycled material. A new material surge bin 14 stores new material for scraping, and the amount of recycled material loosened by the scarifier ears 20 and 21 is measured, and the measured value signal is sent to the control device to determine the measurement result of the amount of loosened recycled material. The mixer 60 is equipped with a scraping amount measuring device 22 that controls the firepower of the burner 54 according to the conditions, and receives and mixes recycled material and new material individually from the recycled material surge bin 23 and the new material surge bin 14. A road surface regeneration device, characterized in that it is supported by the horizontal holding frame 40 via a weight scale 61.