JPH073715A - Vehicle for road pavement - Google Patents

Abstract

PURPOSE:To reuse waste asphalt concrete produced at a construction site for reconstruction and repairing of a paved road of asphalt concrete and others at the construction site by installing a sieving, mixing and heat mixing device. CONSTITUTION:Waste asphalt concrete and waste cement concrete transferred to a pavement construction site and crushed there are sieved by a vibrating sieve 14 and made into reclaimed aggregate different in particle size. Thereafter, the reclaimed aggregate is mixed at a specified rate by an automatic weighing feeder 18, and new aggregate is regulated in particle size and mixed in a specified rate by an automatic weighing feeder 24. Thereafter, the reclaimed aggregate and the new aggregate are weighed and supplied by a conveyor scale 30, and both of the aggregate and new asphalt are heated and mixed by a rotary kiln 50. In this way, by providing a heated mixture for pavement, waste asphalt concrete blocks dug out by reconstruction and repairing work of a road and others are reused at the construction site. Consequently, it is possible to eliminate heat reserving transportation from an asphalt plant to the pavement site and time and distance restriction.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vehicle for road paving. More specifically, it relates to a road paving vehicle for paving a road with asphalt concrete.

[0002]

[Prior art and its problems] Asphalt concrete paving the road (asphalt concrete is often abbreviated as ascon in the industry, so in this description, it is often abbreviated as ascon) If it is used for more than 10 years due to frequent passage and exposure to wind and rain, surface irregularities due to "rutting" and cracks due to deterioration will occur, so it will be necessary to replace or repair the pavement. When these replacements and repairs are carried out, the excavated waste ascon lumps have been landfilled as waste, but the amount of waste has become extremely large with the development of the road network. It's a problem. On the other hand, some have started to reuse the waste ascon lumps dug up.

Although some roads are paved with cement / concrete, deteriorated cement / concrete pavement may be replaced or repaired with ascon.
Even in this case, it is desirable to reuse the excavated waste cement / concrete lump without treating it as waste.

Originally, ascon is an aggregate composed of crushed stones which is bonded with solid asphalt at room temperature, so that a temperature of 120 to 160 ° C. is required for mixing the aggregate and asphalt. Is generally manufactured in a permanent asphalt plant. Therefore, when reusing the waste ascon lumps dug up, it is necessary to transport them to the asphalt plant and accumulate them in the stockyard. Moreover, even if the waste ascon lumps are regenerated, they must be transported to the pavement construction site again, further increasing the recent congestion of roads.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made in view of the above problems, and is a road paving vehicle for paving a road, particularly a construction site for pavement replacement and repair. It is an object of the present invention to provide a vehicle for road paving, which enables reuse of waste ascon lumps and / or waste cement / concrete lumps generated in the field.

[0006]

[Means for solving the problems] The above-mentioned objects are at least the crushed waste asphalt concrete and / or
Alternatively, a means for sieving the waste cement / concrete, a means for mixing the sieved waste asphalt / concrete and / or the sieved waste cement / concrete as recycled aggregates having different particle sizes at a constant ratio, and measuring and supplying. Means, means for mixing new aggregates having different particle sizes in a fixed ratio and means for measuring and supplying, means for measuring and supplying new asphalt, and heating the recycled aggregate, the new aggregate and the new asphalt. It is achieved by a road paving vehicle, characterized in that it comprises a means for mixing.

[0007]

[Function] On the road paving vehicle sent to the pavement construction site, the crushed waste asphalt concrete and / or waste cement concrete is sieved to produce recycled aggregate with different particle sizes, and these are used in a certain ratio. Mixed and weighed, and separately prepared new aggregates with different particle sizes are mixed and weighed at a fixed ratio, both are fed to the heating and mixing means, and new asphalt is further weighed and fed to the heating and mixing means. By mixing the recycled aggregate, the new aggregate, and the new asphalt to obtain a heated mixture for paving, waste asphalt / concrete lumps excavated by road replacement or repair work and / Or waste cement
It is possible to reuse concrete lumps at construction sites without making them into waste.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A road paving vehicle according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing the concept of a road paving vehicle or a road paving truck according to an embodiment of the present invention. The road paving vehicle according to the present embodiment includes a frame 2 on a bogie 1.
A crusher 11 for crushing the excavated waste ascon lump, a hopper 12 for storing the crushed waste ascon, and a vibrating sieve 14 for crushing the waste ascon from the hopper 12.
Bucket elevator 13 for supplying to, coarse crushed ascon (grain size 20 mm to 13 mm) and fine grains (particle size 1
3 mm or less), a vibrating sieve 14 for sieving, a coarse-grain reclaimed aggregate hopper 15 for storing the crushed waste ascon having different grain sizes, respectively, which are stored as reclaimed aggregate, a fine-grain reclaimed aggregate hopper 16, A ratio control mixer 17 for mixing different recycled aggregates at a fixed ratio to adjust the particle size, an automatic metering device 18 for metering the recycled aggregates with the adjusted particle size, and a new aggregate coarse powder prepared separately. Coarse-grain new aggregate hopper 21, fine-grain new aggregate hopper 22, which stores granules (particle diameter 20 mm to 13 mm) and fine particles (particle diameter 13 mm or less) respectively, and new aggregates having different particle diameters at a constant ratio. A ratio control mixer 23 for mixing and adjusting the particle size, an automatic metering feeder 24 for metering the particle size adjusted new aggregate, while measuring both the particle size adjusted recycled aggregate and the new aggregate Conveyor scale 30 for supplying and transferring a fixed amount, said regeneration Conveyor the wood and new bone material scale 3
A bucket elevator 31 for supplying the rotary kiln 50 from 0, a heat insulation tank 41 for heating and melting new asphalt, and a pump 42 for supplying the heated asphalt to the rotary kiln 50, and a flow meter 43 connected downstream thereof. A rotary kiln 50 equipped with a heavy oil burner 51 for heating and mixing recycled aggregate, new aggregate and new asphalt, and a heating storage tank 52 for storing heated recycled ascon discharged from the rotary kiln 50 are mounted. There is.

The vehicle is of a trailer type, and is connected to the power vehicle 3 at a connecting portion 4 and sent to a destination.

FIG. 2 is a more detailed view of the vibrating screen 14 in FIG. 1 for screening the recycled aggregate. 2 is a partially cutaway side view of the vibrating screen 14. The body 60 of the vibrating screen 14 includes coil springs 68a, 68b, 69a, 69b.
Is supported on the floor by four points. A supply port 61 for recycled aggregate to be sieved is provided on the upper wall of the main body 60 on the upstream side (left side in the drawing). Further, a pair of vibration motors 67a and 67b are provided on both side walls of the main body 60. As is well known, unbalanced weights are fixed to both ends of those rotating shafts, and centrifugal force is generated by the rotation, but the centrifugal forces of the vibration motors 67a and 67b are synchronized and combined. The linear vibration in the direction of arrow a is given.

Inside the vibrating screen 14, a mesh of 20 mm is provided on the upper stage.
Screen 62, screen 6 with a mesh of 13 mm in the lower row
4 is stretched, and the screen 62 has a main body 60 on the screen.
Of the screen 64, which is discharged to the outside through the discharge port 63 at the downstream end of the screen 64, is opened from the lower opening 65 of the main body 60, and the screen below the screen 64 is also another lower opening 66.
Are loaded into the aggregate hoppers 15 and 16 below, respectively. That is, among the crushed waste ascon supplied from the supply port 65, those having a particle size of 20 mm or more are discharged from the discharge port 63, and the coarse regenerated aggregate having a particle size of 20 mm to 13 mm is used under the screen of the screen 62 or the screen. The fine grain recycled aggregate with a particle size of 13 mm or less is taken out from the opening 66 and is taken out from the opening 66.

FIG. 3 shows the automatic metering and feeding machine 1 shown in FIG.
It is a figure which shows 8 and 24 and the conveyor scale 30 more concretely. That is, in FIG.
Reference numerals 8 and 24 respectively include a vibrating feeder 54 for recycled aggregate and a vibrating feeder 84 for new aggregate, which are shown as a combination with the conveyor scale 30. Since the vibrating feeders 54 and 84 have the same elements and operate in the same manner, the first digit of the reference numeral of the same element is the same and is shown in parentheses, and the vibrating feeders 54 and 84 will be described at the same time. . The vibrating feeder 54 (84) is composed of a hopper 55 (85), an electromagnetic vibrating feeder main body 56 (86), and a drive section 57 (87) thereof. The electromagnetic vibration feeder main body 56 (86) is provided with a known structure, that is, a trough having a U-shaped cross section, and a driving portion (electromagnetic type) is attached to an end wall of the trough to give a linear vibration in a direction of an arrow b. The mechanism of the electromagnetic vibration drive is known. In response to this vibration, the aggregate in the U-shaped trough is transferred to the right in the figure and supplied to the conveyor scale 30 below. The drive unit 57 (87) is the control unit 7.
In response to the feedback signal from 9, the vibration supply unit 56
The supply amount from (86) is controlled. The hopper 55
(85) is interlocked with the vibrating feeder main body 56 (86). When the vibrating feeder main body 56 (86) is driven, the aggregate is cut out from the hopper 55 (85) and the vibrating feeder main body 56 (86). ) And the vibration feeder main body 56 (86) is stopped, the supply from the hopper 55 (85) is also stopped.

The conveyor scale 30 includes a motor 71, a rotary belt 72 for transmitting the rotation of the motor, a drive roller 73a,
The driven roller 73b and the belt 74 around which these rollers are wound, and the rotary shaft 7 of the drive roller 73a.
6a and the rotary shaft 76b of the driven roller 73b are connected by a rod 75. The rod 75 is supported by a fulcrum 77 and a load cell 78, and the weight of the conveyor scale 30 is input to the control unit 79 as a signal from the load cell 78.

The combination of the vibrating feeders 54, 84 and the conveyor scale 30 works as follows. Drive roller 7
The rotation signal extracted from the rotating shaft 76a of 3a is input to the control unit 79, and the feedback signal from the control unit 79 controls the rotation of the motor 71 to cause the belt 74 to run at a constant speed.

Further, the signal from the load cell 78 indicates the total weight of the conveyor scale 30, but since the weight without load is known, it indicates the weight of the aggregate on the belt 74 excluding this, and the belt 74 is constant. Since the vehicle is traveling at the speed of, the signal from the load cell 78 is used as the supply amount from the conveyor scale 30 to the bucket conveyor 31 in the control unit 79, and the feedback signal for making the amount of aggregate on the belt 74 constant vibrates. Drive unit 5 of the feeder main body 56 (86)
7 (87) to adjust the supply amount from the vibration feeder 54 (84). In this way, the conveyor scale 3
The supply amount from 0 to the bucket elevator 31 is always maintained constant. The entire device shown in FIG. 3 can be made compact enough to be mounted on a vehicle.

The road paving vehicle according to the embodiment of the present invention is constructed as described above, and its operation will be described below.

The waste ascon lump dug up from the deteriorated ascon paved road is crushed by the crusher 11 to a size suitable for sieving in the next step, and stored in the crushed waste ascon hopper 12. The crushed waste ascon is supplied from the hopper 12 to the vibrating screen 14 by the bucket elevator 13. The crushed waste ascon is screened by a vibrating screen 14 into coarse particles (particle size 20 mm to 13 mm) and fine particles (particle size 13 mm or less), and each is used as recycled aggregate to use coarse-grain recycled aggregate hopper 1
5 and the fine-grain recycled aggregate hopper 16 are once stored.
Then, the ratio control mixer 17 mixes the coarse-grain reclaimed aggregate and the fine-grain reclaimed aggregate at a constant ratio to adjust the grain size so as to match the aggregate grain size required for pavement, and the automatic metering and feeding device 18 And is supplied to the conveyor scale 30.
On the other hand, coarse particles of newly prepared aggregate (particle size 20 mm to 13
mm) and fine particles (particle diameter 13 mm or less) are respectively stored in the coarse-grain new aggregate hopper 21 and the fine-grain new aggregate hopper 22, and like the above-mentioned recycled aggregate, the ratio control mixer 23 is used. The new aggregate, which has been mixed and whose particle size has been adjusted, is supplied to the conveyor scale 30 by the automatic metering and supplying device 24.

The roads to be replaced or repaired have different pavement constructions, service conditions, and service years at the time of new construction, so the quality of the waste ascon lumps dug up varies, and therefore, it is a recycled aggregate to maintain the quality of pavement. The mixing ratio with the new aggregate cannot be constant, but about 85% of the recycled aggregate is about.
It is in the range of 60% (weight, the same below) and 15% to 40% of new aggregate.

Both the recycled aggregate and the new aggregate of which particle size have been adjusted are weighed by the conveyor scale 30 and continuously fed into the rotary kiln 50 via the bucket elevator 31. The controller, which is not shown in FIG. 1, receives a weighing value signal from the conveyor scale 30 so that the input amount per hour from the conveyor scale 30 is constant. The adjustment of the supply amount of the machines 18 and 24 is as described in FIG.

Further, the new asphalt in a molten state is supplied from the heating / heat-retaining tank 41 to the rotary kiln 50 via the flow meter 43 by the pump 42. Asphalt remains in the recycled aggregate but has deteriorated, and since new aggregate is also mixed, the amount of new asphalt newly supplied varies depending on the construction, but it is 0% of the total amount of aggregate. ~
It is in the range of 5%.

The rotary kiln 50 burns heavy oil with a heavy oil burner 51 to maintain the temperature at 120 ° C to 160 ° C. The recycled aggregate and new aggregate are heated and mixed until the entire surface is covered with asphalt. At this time, heating above 180 ° C must be avoided because the asphalt will begin to thermally decompose. The rotary kiln 50 operates continuously,
The retention time until the injected recycled aggregate and new aggregate are discharged is within several minutes. The heated mixture discharged from the rotary kiln 50 is heated as recycled ascon to the tank 52.
It is stored under heating.

The resulting heat-regenerated ascon is laid flat by the general paving machine asphalt finisher different from the road paving vehicle according to the present embodiment on the roadbed surface to be paved while the thickness is adjusted, and then the temperature is maintained. Immediately before it falls, it is also compacted by rolling by means of conventional road rollers or tire rollers.

The road paving vehicle according to the present embodiment is constructed and operates as described above. However, when the road paving vehicle according to the present embodiment is used, as described above, it is possible to replace or repair ascon paving. As a result, it is possible to pave recycled ascon to recycle waste ascon, and to transport asphalt lumps to landfills as before, or to reuse waste ascon lumps, which is usually located at a remote location.
It does not need to be transported to the plant, so congestion on the road is not promoted.

Further, since the ascon for pavement requires heat insulation transportation, the place where the ascon pavement can be made is asphalt.
Although it is limited to within 20 km to 30 km from the plant and within 2 hours each way, the road paving vehicle according to the present embodiment is equipped with a rotary kiln 50 for heating and mixing and necessary heating and heat retaining equipment. It only needs to be sent to the site, and is not subject to the time and distance restrictions on the pavement site at all, unlike in the past.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the embodiments, the crusher 11 crushes the waste ascon lumps for reuse of the waste ascon lumps. However, the deteriorated cement / concrete paved road is repaired or repaired with the ascon. In this case, the crushed waste cement / concrete block is crushed by the crusher 11.

In the embodiment, the crusher 11 for crushing the waste ascon lump is mounted on the road paving vehicle, but it is installed on the ground nearby or mounted on another vehicle.
The crushed waste ascon may be loaded into the hopper 12 by a belt conveyor on which the waste ascon is placed. By doing so, the road paving vehicle of this embodiment having the functions of sieving, metering, ratio-controlled mixing, etc. can be isolated from the vibration by the crusher 11.

In the embodiment, the heating storage tank 52 for storing the heated recycled ascon is mounted on the road paving vehicle, but it may be mounted on another vehicle. This makes the paving of recycled ascon more flexible.

In the embodiment, the recycled aggregate and the new aggregate are mixed, but a dedicated hopper and automatic metering and feeding machine are used so that stone powder for adjusting the particle size of the aggregate can be used. It may be added separately. Further, in the examples, the regenerated aggregate and the new aggregate were sieved to two kinds of particle diameters, that is, coarse particles and fine particles, but it may be 3 to 5 kinds if necessary.

In the examples, bucket elevators 13 and 31 were used to supply the crushed waste ascon to the vibrating screen 14, the particle size adjusted recycled aggregate from the conveyor scale 30 to the rotary kiln 50, and the new aggregate. However, this may be a belt conveyor or other known transporter.

Although the examples have been described with respect to paving with recycled ascon, it will be obvious that the examples can also be used for paving with only new aggregate and new asphalt. What is necessary is to heat and mix the new aggregate and the new asphalt, the particle size of which has been adjusted, because the road paving vehicle of this embodiment has that function. Even in this case, the paving place is not limited in terms of distance and time.

In the embodiment, the road paving vehicle is of the trailer type, but it goes without saying that it may be of the self-propelled type.

Further, in the embodiment, the paving target of recycled ascon is a road, but the runway of an airport is also included in the target.

[0035]

As described above, when replacing or repairing ascon paved roads and / or cement / concrete paved roads, waste ascon lumps and / or waste cement / concrete lumps dug up to date are landfilled as waste. Or abandoned ascon lumps, they are transported far by truck for regeneration at the asphalt plant.
When the vehicle for road paving of the present invention is used, waste ascon lumps and / or waste cement / concrete lumps can be reused at a construction site, so that it is possible to avoid contributing to road congestion. Further, ascon for pavement requires heat-insulated transportation, and there are time and distance restrictions from the asphalt plant at the pavement site, while using the road paving vehicle of the present invention does not impose such restrictions. Will be resolved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a concept of a road paving vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of the vibrating screen shown in FIG.

FIG. 3 is a diagram showing a specific example in which the automatic metering and feeding device in FIG. 1 is used as a vibrating feeder, and this is combined with a conveyor scale.

[Explanation of symbols]

 1 Cart 2 Frame 14 Vibrating sieve 17 Ratio control mixer for recycled aggregate with different particle size 24 Ratio control mixer for new aggregate with different particle size 30 Conveyor scale 41 Asphalt heating tank 50 Rotary kiln 51 Heavy oil burner

Claims (1)

[Claims] 1. At least means for sieving crushed waste asphalt concrete and / or waste cement concrete, and sieving waste asphalt concrete and / or sieving waste cement concrete in particle size Means for mixing and measuring and supplying different recycled aggregates at a constant ratio, means for mixing and measuring new aggregates having different particle sizes at a constant ratio, means for measuring and supplying new asphalt, Also, a vehicle for road paving, comprising means for heating and mixing the recycled aggregate, the new aggregate and the new asphalt.