JPH06228912A - Asphalt repairing method and repairing machine - Google Patents

Abstract

PURPOSE:To remove efficiently a deteriorated asphalt pavement surface layer and to reuse aggregate in the deteriorated asphalt pavement surface layer after removal. CONSTITUTION:Microwaves are radiated to an asphalt pavement surface layer section 1b, and after the surface layer section is softened, a softened part is cut by an asphalt elimination means such as a blade provided to a car 2. The microwaves are guided to a reflecting mirror through a waveguide from a microwave generator 5 of a microwave radiation means mounted on the car 2, the microwaves reflected therefrom are radiated to a recessed antenna, and the microwaves reflected therefrom are radiated to the asphalt pavement surface layer section with concentration to soften. Exhaust gas exhausted from an internal combustion engine generator 6 supplying power to the microwave generator 5 is taken into an enclosure 8 and, at the same time, waste heat of the exhaust taken in preheats a deteriorated asphalt pavement surface layer section to be eliminated through a preheat device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt repair method and a repair machine for removing a deteriorated asphalt surface layer portion of an asphalt pavement.

[0002]

2. Description of the Related Art A conventional asphalt repair machine will be described with reference to FIGS. 4 and 5. In FIG. 4, 49 is a deteriorated asphalt pavement surface layer portion, 50 is a vehicle (main body of the repair machine), and 50 is a rear portion of the vehicle. Engine 5 for driving the vehicle and driving the excavation unit
1 is mounted, and an excavation section 52 is provided at the center of the vehicle 50. As shown in FIG. 5, the excavation unit 52 includes a rotary shaft 53, a rotary drum 54 that rotates around the rotary shaft 53, a plurality of cutters 55 attached to a circumferential portion of the rotary drum 54, and It is composed of a carbide tip 56 attached to the tip of the cutter 55.

In the asphalt repair machine shown in FIGS. 4 and 5, the vehicle 50 is first stopped on the deteriorated asphalt pavement surface layer portion 49, and then the rotary drum 54 is lowered while rotating the rotary drum 54. The cutter 55 is set so as to reach a predetermined depth. In this state,
While the vehicle 50 is running, the rotating drum 54 is rotated at high speed to excavate and remove the asphalt pavement surface layer portion 49 deteriorated by the cutter 55 with the cemented carbide tip 56.

[0004]

In the conventional asphalt repair machine shown in FIGS. 4 and 5, while the vehicle 50 is running, the rotary drum 54 is rotated at a high speed and deteriorated by the cutter 55 with the cemented carbide tip 56. Since the asphalt pavement surface layer portion 49 is excavated and removed, at this time, the healthy aggregate existing in the deteriorated asphalt pavement surface portion portion 49 is also crushed, which cannot be reused, which is preferable from the viewpoint of effective use of resources. There wasn't.

Further, since the cutter 55 comes into contact with the hard aggregate at a high speed, the cutter 55 is worn or cut early and its life is shortened even though the carbide tip 56 is attached. . Also, since the number of cutters 55 is large, the replacement work with a new one requires a lot of time and effort,
Wear and replacement costs increase. Further, since the rotating drum 54 rotates at a high speed, when the cutter 55 comes into contact with the deteriorated asphalt pavement surface layer portion 49, a large collision noise is generated and noise is generated. Further, since this noise is a fixed collision propagating sound, even if the surroundings of the rotary drum 54 and the cutter 55 are covered by the enclosure, the noise is transmitted to the surroundings through the solid and it is difficult to prevent the propagation of the noise.

The present invention is proposed in view of the above problems, and the object thereof is to efficiently remove a deteriorated asphalt pavement surface layer portion. After removal, the aggregate in the surface layer of deteriorated asphalt pavement can be reused. Low noise construction can be achieved. Energy required for deterioration of the surface layer of asphalt pavement can be saved. It is possible to prevent early wear and breakage of the asphalt removing means, for example, the blade, and reduce blade replacement work and blade wear and replacement costs. Another object is to provide an asphalt repairing method and a repairing machine capable of preventing the occurrence of fire due to overheating.

[0007]

In order to achieve the above object, the asphalt repair method of the present invention is to irradiate the asphalt pavement surface layer with microwaves to soften the surface layer, and to soften the softened portion. It is characterized by removing. Further, the asphalt repair machine of the present invention is provided with a microwave irradiating means for irradiating the vehicle with microwaves toward the asphalt paved road, and asphalt removing means for removing asphalt of a predetermined thickness behind the microwave irradiating means. It is provided.

Further, in the asphalt repair machine of the present invention, the microwave irradiating means is arranged in the lower part of the vehicle, and the microwave generator, the waveguide for transmitting the microwave from the microwave generator. In addition, it is composed of a concave antenna with the same waveguide attached at the center and a reflecting mirror provided at the tip of the antenna. The microwave is reflected by the reflecting mirror and the antenna, and microwaves are used for asphalt pavement. The feature is that the irradiation is concentrated on the surface layer.

Further, the asphalt repair machine of the present invention takes in exhaust gas discharged from an internal combustion engine type generator which supplies electric power to the microwave generator, and utilizes exhaust heat of the taken exhaust gas for preheating of asphalt pavement. A preheating device is provided in the enclosure.

[0010]

According to the asphalt repair method of the present invention, the surface layer of the asphalt pavement is irradiated with microwaves as described above to soften the surface layer and remove the softened portion. At that time, while the vehicle is traveling, the softened portion is scraped off by the asphalt removing means provided on the vehicle. In addition, the microwave generator of the microwave irradiating means mounted on the vehicle guides the microwave to the reflecting mirror through the waveguide, irradiates the microwave reflected here to the concave antenna, and the microwave reflected here. Is intensively applied to the surface layer of the asphalt pavement to soften the surface layer. And while taking in the exhaust gas discharged from the internal combustion engine type generator that supplies electric power to the microwave generator to the enclosure, convey the exhaust heat of the taken-in exhaust gas to the deteriorated asphalt pavement surface layer part to be removed from this through the preheating device, Preheat the surface layer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The asphalt repair method and repair machine of the present invention will now be described with reference to one embodiment shown in FIGS.
Is an asphalt pavement road, 2 is a vehicle (main body of asphalt repair machine), 3 is a driver's cab, and 4 is a dump truck for loading and transporting deteriorated asphalt excavated and removed.

Reference numeral 5 is a microwave generator on the vehicle 2, 6 is a diesel engine type generator on the vehicle 2 for supplying electric power to the microwave generator 5, and 7 is an operation on the vehicle 2 for operating these devices. It is a board. Reference numeral 8 denotes an enclosure arranged at the bottom of the vehicle 2 for the purpose of preventing airborne noise transmission, odor diffusion prevention, heat diffusion prevention, and harmful radio wave leakage prevention. Inside the enclosure 8, a microwave antenna section 9 and an asphalt are provided. A cutting device 10 and a generator engine exhaust gas utilizing asphalt preheating device 11 are provided. 12 is a deteriorated asphalt loader for loading the deteriorated asphalt pavement surface layer portion 1b from which 12 has been removed into the dump truck 4.

FIG. 2 shows the details of the asphalt cutting device 10. 1b is a deteriorated asphalt pavement surface layer portion of the asphalt pavement road 1 and 1a is a healthy asphalt pavement lower layer portion existing below the deteriorated asphalt pavement surface layer portion 1b. Reference numeral 13 denotes a waveguide for transmitting microwaves from the microwave generator 5, and the tip end of the waveguide 13 penetrates the enclosure 8 and is located inside the enclosure 8.

Reference numeral 14 is a reflecting mirror, and 15 is a concave antenna. The tip of the waveguide 13 is attached to the center of the antenna 15. Reference numeral 16 is a support rod attached to the tip of the waveguide 13, and the reflecting mirror 14 is located in the front center of the antenna 15 via the support rod 16. Reference numeral 17 is a blade attached to the vehicle 2, and the blade 17 is located behind the antenna 15.

The deteriorated asphalt pavement surface portion 1b
When simultaneously heating and cutting a wide area, the plurality of antennas 15 and the blade 17 may be provided in parallel in the direction orthogonal to the vehicle traveling direction. Next, the operation of the asphalt repair machine shown in FIGS. 1 and 2 will be specifically described. The microwave generated by the microwave generator 5 is applied to the waveguide 13
Through the waveguide 8 and radiate downward from the tip of the waveguide 13 to hit the reflecting mirror 14 and reflect upward from there to face the concave antenna 15, but the reflecting mirror 14 surface Is appropriately selected to diffuse the upward microwave so as to hit the entire concave surface of the antenna 15.

Further, the microwave is reflected downward from the antenna 15 and directed toward the deteriorated asphalt pavement surface layer portion 1b, but only the deteriorated asphalt pavement surface portion 1b is irradiated by appropriately selecting the curvature of the concave surface of the antenna 15. Then, the deteriorated asphalt pavement surface layer portion 1b is heated to 60 ° C. or higher to be softened. The energy of the microwaves is attenuated when passing through the asphalt, but the focus of the antenna 15 is changed to the deteriorated asphalt pavement surface layer portion 1b and the sound asphalt pavement lower layer portion 1b.
If it is set near the boundary line with a, if it is shallower than the boundary line,
Even if the microwave irradiation density increases toward the lower layer and the energy is attenuated, the heating temperature can be made substantially uniform in the depth direction of the asphalt pavement surface layer portion 1b. On the other hand, in the depths beyond the boundary line, since the energy is attenuated, the sound asphalt pavement lower layer portion 1a is not heated.

This point will be described with reference to the heating and softening cutting device using the electromagnetic horn shown in FIG. 3. Since the microwave radiated from the tip of the waveguide 13 spreads downward as it is, The density of the lower layer is lower than that of the upper layer of the asphalt pavement surface layer 1b, and the energy is attenuated by absorption when passing through the asphalt layer. As a result, the upper layer of the asphalt pavement surface layer portion 1b is heated. On the other hand, the lower layer does not heat up sufficiently, and therefore, in order to soften the lower layer of the asphalt pavement surface layer portion 1b, more microwaves have to be irradiated, and the efficiency decreases.

In the present invention, the concave antenna 15 is used in which the focus of the antenna 15 is set near the boundary between the deteriorated asphalt pavement surface layer portion 1b and the sound asphalt pavement lower layer portion 1a. The softened deteriorated asphalt pavement surface layer portion 1b is provided on the rear blade 1 as the vehicle 2 advances.
It is scraped off at once by 7. The scraped-off deteriorated asphalt pavement surface layer portion 1b is collected by the deteriorated asphalt loader 12, is loaded into the dump truck 4, and is transported to an aggregate recycling site or the like. After that, the vehicle 2 is run to remove the deteriorated asphalt pavement surface layer portion 1b having a predetermined width.

On the other hand, the exhaust gas (exhaust heat) discharged from the diesel engine type generator 6 preheats the one surface of the asphalt pavement to be removed from it through the preheating device 11 installed in the enclosure 8, so that microwave irradiation is performed. The amount of heat softening energy is reduced. Further, since the softened deteriorated asphalt 1b is scraped off by the blade 17, noise at the time of removal is reduced. Since the blade 17 is surrounded by the enclosure 8, the blade 1
The noise generated in 7 does not leak to the surroundings.

Since the concave antenna 15 irradiates microwaves to the deteriorated asphalt pavement surface layer portion 1b in a concentrated manner, the microwaves reflected from the vicinity of the asphalt surface layer are not scattered to the surroundings, and the antenna 15 is used as the enclosure 8. The radio wave interference does not occur due to the fact that it is surrounded by.

[0021]

As described above, the method of repairing asphalt of the present invention deteriorates because the surface layer of the asphalt pavement is irradiated with microwaves when the vehicle is running to soften the surface layer and the softened portion is removed. The surface layer of asphalt pavement can be removed efficiently. During removal, the aggregate in the surface layer of the deteriorated asphalt pavement is not crushed, and the aggregate in the surface layer of the deteriorated asphalt pavement after removal can be reused.

Further, the asphalt repair machine of the present invention is provided with the microwave irradiating means for irradiating the vehicle with microwaves toward the asphalt pavement as described above, and asphalt having a predetermined thickness is provided behind the microwave irradiating means. Asphalt removing means is provided to remove the deteriorated asphalt pavement surface layer that has softened when the vehicle is running, because it is removed by an asphalt removing means, for example, a blade. Low noise construction can be achieved without generating contact noise.

Further, in the asphalt repairing machine of the present invention, the microwave irradiating means is arranged in the lower part of the vehicle, together with the microwave generator, the waveguide for transmitting the microwave from the microwave generator. The waveguide is composed of a concave antenna attached to the central part and a reflecting mirror provided at the tip of the antenna, and the microwave is reflected by the reflecting mirror and the antenna to generate microwaves on the asphalt pavement surface layer. Since the heating temperature in the depth direction of the surface layer of the asphalt pavement is made substantially uniform in a short period of time by irradiating the part of the asphalt pavement surface without softening the healthy lower layer of the asphalt pavement, Energy required for deterioration can be saved. When the vehicle is running, only a small force acts on the asphalt removing means, for example, the blade, and it is possible to prevent the blade from being worn or broken at an early stage, and to reduce the blade replacement work and the blade replacement cost. The surface of the asphalt pavement surface layer is not overheated, and a fire caused by overheating can be prevented.

Further, the asphalt repair machine of the present invention takes in the exhaust gas discharged from the diesel engine type generator which supplies electric power to the microwave generator and preheats the asphalt pavement for removing the exhaust heat of the taken-in exhaust gas. Since the preheating device to be used is provided in the enclosure and the deteriorated asphalt pavement surface layer part to be removed from this is preheated by the same preheating device, the microwave irradiation amount required for softening the asphalt pavement surface part can be reduced. Can also achieve energy savings.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a repair machine used for carrying out an asphalt repair method of the present invention.

FIG. 2 is an operation explanatory view of the asphalt repair machine.

FIG. 3 is an operation explanatory view of a heating and softening cutting device using an electromagnetic horn.

FIG. 4 is a side view showing a conventional asphalt repair machine.

FIG. 5 is a side view showing an excavation portion of the asphalt repair machine.

[Explanation of symbols]

 1 Asphalt Pavement Road 1a Healthy Asphalt Pavement Lower Layer 1b Degraded Asphalt Pavement Surface Layer 2 Vehicle (Asphalt Repair Machine Main Body) 5 Microwave Generator 6 Internal Combustion Engine Type Generator 8 Enclosure 11 Preheater 13 Waveguide 14 Reflector 15 Concave antenna

Claims (4)

[Claims] 1. A method for repairing asphalt, which comprises irradiating the surface layer of the asphalt pavement with microwaves to soften the surface layer and removing the softened portion. 2. The vehicle is provided with a microwave irradiating means for irradiating the asphalt pavement with microwaves and an asphalt removing means for removing asphalt of a predetermined thickness is provided behind the microwave irradiating means. Characteristic asphalt repair machine. 3. The microwave irradiating means is provided in a microwave generator, a waveguide for transmitting microwaves from the microwave generator, and is disposed in a lower portion of a vehicle, and the waveguide is centrally disposed. It is composed of a concave antenna attached to the section and a reflecting mirror provided at the tip of the antenna, and microwaves are concentrated and applied to the asphalt pavement surface layer by the microwave reflecting action of the reflecting mirror and the antenna. The asphalt repair machine according to claim 2, wherein 4. A preheating device is provided inside the enclosure, which takes in exhaust gas discharged from an internal combustion engine type generator that supplies electric power to the microwave generator, and uses exhaust heat of the taken exhaust gas for preheating of asphalt pavement. The asphalt repair machine according to claim 3, wherein