JPS6340500Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a heating device used when repairing asphalt pavement, etc.

<Prior art> When repairing an existing asphalt pavement made of asphalt mixture, the repaired surface is usually heated and softened using a heating device and then regenerated and repaired. A conventional example of such a heating device is one in which asphalt pavement is heated by a heater attached to the lower part of a vehicle running on the asphalt pavement.

By the way, on asphalt paved roads that are being renovated and repaired, the pavement surface becomes uneven over time due to the passage of heavy vehicles, etc., and tire chains and spikes are installed to prevent slips in cold and snowy regions. The tires wear out and cause ruts or depressions on the pavement surface.

When asphalt pavement with such irregularities is heated and softened using a conventional heating device, the minimum temperature required for rehabilitation and repair, for example 120°C, is shown in Figure 1.
The temperature range A of ~130°C or higher reached only a substantially constant depth from the surface of the uneven part of the asphalt pavement. Further, the thermal conductivity of asphalt pavement is extremely poor, and the depth at which the minimum temperature can be maintained without burning the surface of asphalt pavement is about 30 to 40 mm.

However, the difference in height of uneven parts that actually occurs (the first
d) in the figure may be about 60 to 70 mm, and in this case, the whole surface of the heated and softened asphalt pavement can be regenerated and repaired by, for example, running an asphalt pavement regeneration and repair device once according to the construction width W. In this case, since parts that have not reached the specified temperature are also repaired, there is a risk that asphalt mixture that is not sufficiently heated and softened will be mixed into the repaired pavement, leading to a deterioration in the quality of the asphalt pavement.

In order to prevent this, conventionally, before heating the asphalt pavement, the convex parts were manually removed to reduce the height difference, and then the heating and rehabilitation work was performed, but this method reduced the efficiency of the rehabilitation work. There were drawbacks such as poor performance and increased construction costs.

<Summary of the invention> The present invention was devised in view of such conventional drawbacks, and the existing asphalt pavement is heated by a front heater and also heated by an intermediate heater.

After that, the heated asphalt pavement is loosened to a predetermined depth using a scraping device, and is leveled to a predetermined height using a leveling device, and the leveled asphalt pavement is further heated using a rear heater. Asphalt pavement that is being recycled and repaired can be heated uniformly to a predetermined depth. In addition, the front heater and rear heater are moved and stored near the vehicle body, so that the heating device can be moved to other construction sites within the transport limit under the Road Traffic Act.

<Example> The present invention will be described below based on an example shown in FIGS. 2 to 4.

In FIG. 2, reference numeral 1 denotes a vehicle that can run on its own using tires 3 and 4 attached to the front and rear parts of a chassis 2. Further, a driver's cab 5 is provided on the upper part of the vehicle chassis 2, and the front part of the driver's cab 5 drives the rear tires 4 via a chain 4a, and also connects the power source of each part via a hydraulic pump (not shown). An engine 6 is provided.

In addition, a front heater support member 7 is provided at the front of the chassis 2.
is mounted so that it can rotate freely in the horizontal direction. A hydraulic cylinder 8 is provided between the front heater support member 7 and the front end of the vehicle chassis 2 to rotate the heater support member 7 in a horizontal plane. Further, a front bracket 9 is attached to the front part of the front heater support member 7 so as to be movable in the vertical direction.
A hydraulic cylinder 10 is provided for vertically moving the.

Further, a front heater support arm 11 is attached to the front bracket 9 so as to protrude toward the front of the vehicle so as to be rotatable in the vertical direction. A hydraulic cylinder 12 for rotating the support arm 11 in a vertical plane is disposed between the front heater support arm 11 and the front upper part of the vehicle chassis 2, and lifts the support arm 11 to an upper position. The front heater A supported by 11 is transported to its storage position (shown by chain lines in FIG. 1) and stored. Therefore, the front heater support arm 11
and the hydraulic cylinder 12 constitute a front storage device that moves and stores the front heater A near the vehicle body (undercarriage 2).

The front heater A is constructed by arranging two heater 13 bodies in parallel in the vehicle traveling direction. Each heater 13
A plurality of hollow pyramids 14 with open bottom surfaces are disposed in the housing, and a burner 15 is attached to the top of each pyramid 14, respectively. These burners 15 are connected to a fuel tank 16 that supplies fuel and to a blower 17 that supplies combustion air.

The rear heater B attached to the rear of the chassis 2 and the intermediate heater C attached to the lower part of the chassis 2 via the vertical movement hydraulic cylinder 18 also have the same configuration as the front heater A. The same reference numerals are used to omit the explanation.

Here, the rear heater B is transported to its storage position (shown by chain lines in FIG. 1) and stored by the front heating support arm 11 and the hydraulic cylinder 12. Therefore, the front heater support arm 11 and the hydraulic cylinder 12 constitute a rear storage device.

Further, a hydraulic cylinder 19 for vertical movement is attached to the lower part of the chassis 2 between the rear tire 4 and the rear heater C, and a scarifier body 20 extending in the width direction of the vehicle is attached to the tip of the piston rod of the hydraulic cylinder 19.
is installed. A plurality of claws 21 are provided at the lower part of the scarifier main body 20 to dig into the asphalt pavement to a predetermined depth and scrape it up while cutting it. These claws 21 extend in the width direction of the vehicle, and further claws 21 are attached to the rear between the claws 21, 21. Here, the scarifier main body 20 and the claw 21 constitute a scarifier ear 22.

A support portion 20 is provided at the rear of the scarifier main body 20.
A leveling screw 23 is provided on the support portion 20a, which is formed to protrude rearward and extends in the width direction of the vehicle and has spiral blades (not shown) on its peripheral wall. Further, a plate-shaped blade 24 whose tip portion contacts the asphalt pavement is provided on the support portion 20a at the rear of the leveling screw 23 and extends in the width direction of the vehicle. The blade 24 is provided with an adjustment handle 25 for vertically moving the position of its tip. Then, the asphalt mixture scraped up by the scarifier 22 is
The leveling screw 23 and blade 24, which are rotationally driven by a motor 23a, transport the material in the width direction of the vehicle and spread it uniformly. Here, the leveling screw 23 and the blade 24 constitute a leveling device.

Furthermore, a heat-resistant heat insulating sheet 25 is attached to the rear of each of the heaters A, B, and C to cover the surface of the asphalt pavement and prevent heat radiation from the surface.

Incidentally, the combustion amount adjustment of the burner 15 and the operation of the hydraulic cylinders 8, 10, 12, 19, etc. are performed by operating the operation panel 26 in the driver's cab 5.

Next, the operation of such a heating device will be explained with reference to FIG.

First, the height difference of the uneven parts of the asphalt pavement (shown by broken lines in Figure 4) is measured to determine the dimensions of the protrusions to be scraped out. Based on this, the loosening depth d' is set. Adjust the biting amount of claw 21. Then, the uneven asphalt pavement is heated and softened by the front heater A and the intermediate heater C while the heating device is running on its own. If the asphalt pavement heated by the front heater A is further heated by the intermediate heater C after a predetermined time, the asphalt pavement heated by the front heater A will pass through the front heater A. Immediately afterwards only the surface is slightly cooled and then heated by an intermediate heater. Therefore, it is possible to heat the asphalt pavement surface without raising the temperature too much, and while preventing the asphalt pavement from overheating, it is possible to perform good heating to deeper parts sufficiently and in a short time.

After the convex parts of the heated and softened asphalt pavement (that is, the parts corresponding to the loosening depth d') are scraped up by the scarifier 22, the asphalt mixture scraped up by the leveling screw 23 and the blade 24 is further scraped in the width direction of the vehicle. The asphalt pavement is then transported to a recess and buried in a recess, and the scraped asphalt pavement is leveled to a predetermined height. Thereafter, the asphalt pavement leveled to a predetermined height is heated by a rear heater B to raise the temperature to the minimum temperature required for rehabilitation, for example, 120 to 130° C., to the depth D for rehabilitation and repair.

Therefore, even if the asphalt pavement is regenerated and repaired by running the regeneration and repair equipment afterwards, since the asphalt pavement is heated above the specified temperature to the predetermined depth D, the asphalt mixture is not sufficiently softened by heating. It does not mix into the repaired pavement and does not cause a deterioration in the quality of the asphalt pavement.

In this manner, in this embodiment, heating can be performed to the repair depth without requiring manual cutting of the convex portion, thereby improving work efficiency. In addition, the front and rear heaters A and B are moved near the vehicle body by operating the hydraulic cylinder 12 and transported to and stored in the storage position shown by the chain line in FIG. Once the length is within the transport limit under the Road Traffic Act (width <2.5m, length <12m), it can be driven around to other construction sites.

In addition, new asphalt mixture is supplied to the depression D' where there is a shortage of asphalt mixture to make it flush with the existing asphalt pavement surface.

Furthermore, in this embodiment, a heat insulating sheet 25 is attached to the rear of each heater A, B, and C, so that heat radiation from the heated asphalt pavement to the atmosphere can be prevented, and the asphalt pavement can be heated effectively. Ru.

In this embodiment, the asphalt pavement is scraped up using the scarifier ear 22, but the asphalt pavement may be scraped up using a rotary cutter or the like.

<Effects of the invention> As explained above, the present invention heats asphalt pavement with a front heater and heats it with an intermediate heater, then loosens the asphalt pavement with a scraping device, and spreads the asphalt pavement to a specified level with a leveling device. Since the asphalt pavement is leveled to a height of 1, and the leveled asphalt pavement is heated by a rear heater, it is possible to maintain the minimum temperature required for repair up to the depth for rehabilitation and repair. Therefore, it is possible to prevent deterioration in the quality of asphalt pavement during repair using a recycling repair device, etc., reduce the number of manual work steps, and improve the efficiency of heating work on uneven portions, etc. In addition, since the front and rear heaters were moved and stored near the vehicle body, the width and length of the heating devices were within the transport limit under the Road Traffic Act, and the device could be driven to other construction sites by itself. Can run around.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an asphalt paved road, Fig. 2 is a side view of a heating device showing an embodiment of the present invention, Fig. 3 is an enlarged view of the main part of Fig. 2, and Fig. 4 is an illustration of the present invention. It is a longitudinal cross-sectional view of an asphalt pavement road for explanation. A...Front heater, B...Rear heater, C...
Intermediate heater, 13... Heater, 15... Burner, 20... Scarifier body, 21... Claw, 22... Scarifier, 23... Leveling screw, 24... Blade.

Claims (1)

[Scope of utility model registration request] A heating device that heats asphalt pavement includes a front heater that is arranged to protrude forward from the front end of a vehicle and heats the asphalt pavement, and a front heater that is moved to and stored near the vehicle body. an intermediate section storage device, an intermediate section heater that is provided at an intermediate section of the vehicle at a predetermined distance from the front section heater and heats the asphalt pavement heated by the front section heater; A loosening device that loosens asphalt pavement heated by a device to a predetermined depth, a leveling device that spreads the asphalt pavement loosened by the loosening device to a predetermined height, and a rear end of a vehicle. A rear heater that is arranged to protrude further rearward and heats the asphalt pavement leveled by the leveling device, and a rear storage device that moves and stores the rear heater near the vehicle body. A heating device for paved roads, etc., characterized by: