JP4185632B2 - Method and apparatus for recycling concrete waste using asphalt plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for separating and recovering aggregate from concrete waste generated as a result of demolition of a concrete structure, and particularly to an apparatus for producing an asphalt mixture that is a road pavement. The present invention relates to a reproduction method and apparatus.
[0002]
[Prior art]
Most of the concrete waste generated by the demolition of concrete structures is disposed of by landfill, etc., but it has become difficult to secure a landfill site, and the cost of the disposal has increased. From various circumstances such as depletion of aggregate resources and environmental conservation, concrete waste has been crushed and reused as roadbed material. Recently, in order to further increase the added value of the crushed concrete waste, it has been considered to remove the mortar and recover the aggregate itself.
[0003]
As one method of reclaiming this concrete waste material, the concrete waste material appropriately crushed with a crusher or the like is heated to 100 ° C. or higher, and the concrete waste material weakened by thermal expansion is rubbed together with a mill or the like. There is a method in which mortar adhering to the aggregate surface is peeled off, and this is collected by sieving according to particle size.
[0004]
[Problems to be solved by the invention]
However, a large amount of capital investment is required when a dedicated facility is provided in order to realize the above-mentioned method for recycling concrete waste, but there is a problem in profitability when considering the aggregate price reclaimed for the investment amount. it is conceivable that.
[0005]
Then, this inventor paid attention to the asphalt plant provided with functions, such as a heating and sieving which are basic functions for realizing the recycling method of the above-mentioned concrete waste material. The asphalt plant is a device that produces asphalt mixture, which is a road pavement material, and it was thought that if the facilities of this asphalt plant were used, it was possible to recycle concrete waste with little capital investment.
[0006]
This invention makes it a subject to provide the method and apparatus which recycle | regenerate a concrete waste material by cheap equipment investment using an asphalt plant in view of said point.
[0007]
[Means for Solving the Problems]
A method for reclaiming concrete waste using an asphalt plant according to the present invention for solving the above problems includes a heating step of supplying concrete waste to a new material dryer of the asphalt plant and heating it to a predetermined temperature, and heated concrete. A mortar stripping process that strips the mortar on the aggregate surface by supplying the waste material to the mortar stripping device, and a micro-layer that separates the fine components by supplying the concrete waste material stripped from the mortar to the asphalt pavement waste material dryer and sucking and exhausting it with an exhaust fan. And a sieving step in which the aggregate discharged from the asphalt pavement waste dryer is supplied to the vibration sieve of the plant body and sieved according to the particle size.
[0008]
In addition, the concrete waste recycling apparatus according to the present invention supplies aggregate to a new dryer and heats the aggregate, and the heated aggregate is screened according to the particle size by a vibrating sieve at the top of the plant body to form an aggregate storage bin. While storing, supply the asphalt pavement waste material to the asphalt pavement waste dryer and heat it, store this heated waste material in the waste material storage bins, discharge a predetermined amount of aggregate from each storage bin to the mixer and add asphalt Asphalt plant that produces asphalt mixture by mixing and adjusting, equipped with a mortar peeling device that peels off the mortar on the aggregate surface by rubbing the heated concrete waste material, and the concrete waste material discharged from the dryer for new materials The path switching means for supplying to the mortar peeling device and the concrete discharged from the mortar peeling device. Conveying means for conveying the preparative waste into asphalt pavement waste for dryer is characterized in that a means switching path for supplying the vibrating screen plant body concrete waste discharged from asphalt pavement waste for dryer.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to the method for recycling concrete waste material using the asphalt plant according to the present invention, first, the concrete waste material appropriately crushed is supplied to a new material dryer of the asphalt plant and heated to a predetermined temperature. In this heating process, the mortar in the concrete waste material becomes brittle, and the mortar easily peels off from the aggregate surface due to the difference in thermal expansion coefficient between the aggregate and the mortar. Next, the heated concrete waste material is supplied to a mortar peeling device additionally installed in the asphalt plant and ground. In this mortar peeling step, the mortar is peeled off from the aggregate by rubbing the aggregates that have been easily peeled off in the heating step.
[0010]
Next, the concrete waste from which the mortar has been peeled is supplied to the asphalt pavement waste dryer in the asphalt plant, and only the suction exhaust is performed by the exhaust fan without heating, and the concrete waste is tumbled down in the drum. The minute content is raised and separated. The fine components that soar in the separation process are captured and collected by a dust collector. The aggregate that has undergone the separation process is supplied to the vibrating sieve of the asphalt plant main body, sieved, and collected according to particle size.
[0011]
As described above, this recycling method includes a heating process, a mortar peeling process, a fine separation process, and a sieving process for regenerating concrete waste material. This makes it possible to recycle concrete waste with a low capital investment.
[0012]
Further, according to the concrete waste material recycling apparatus according to the present invention, a mortar peeling device is additionally installed in the asphalt plant for producing the asphalt mixture, and the concrete waste material is a new material dryer, mortar peeling device, asphalt pavement waste material dryer. By providing the path switching means and the conveying means so as to flow in the order of the vibrating sieve, it is possible to recycle the concrete waste material in addition to manufacturing the asphalt mixture.
[0013]
And when recycling concrete waste material, the concrete waste material suitably crushed is supplied to the dryer for new materials, and it heats to predetermined temperature, and makes it easy to peel mortar from the aggregate surface. Next, the waste concrete material discharged from the dryer for new material is supplied to the mortar peeling device side different from the route at the time of manufacturing the asphalt mixture by operating the route switching means.
[0014]
In the mortar peeling device, the mortar is peeled from the aggregate by rubbing the aggregates together. Next, the concrete waste material discharged from the mortar peeling device is supplied to the asphalt pavement waste material dryer by the conveying means.
[0015]
Asphalt pavement waste material dryers perform suction and exhaust with a blower, and while the concrete waste material rolls down in the drum, the fine content in the waste material rises and is separated. The concrete waste discharged from the asphalt pavement waste dryer is an aggregate with less mortar adhesion, and this aggregate is moved to the vibrating screen side of the plant body different from the route at the time of manufacturing the asphalt mixture by operating the route switching means. Supply.
[0016]
In the vibration sieve, the aggregate is sieved according to the particle size and is temporarily stored in the lower aggregate storage bin. The aggregate stored in the aggregate storage bin is appropriately taken out for each particle size, stored in a dedicated storage facility, and reused.
[0017]
In this way, by adding a mortar stripping device, appropriate route switching means and conveying means to the asphalt plant, it becomes a device equipped with both functions of asphalt mixture production and concrete waste recycling, and recycling of concrete waste can be done with low capital investment. It becomes possible.
[0018]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
Since the concrete waste material recycling apparatus according to the present invention is obtained by adding some equipment to the asphalt plant for producing the asphalt mixture, the schematic configuration of the asphalt plant will be described first in order to make the added equipment easier to understand.
[0020]
In the figure, reference numeral 1 denotes a new material dryer for heating a new aggregate, and the new material dryer 1 tilts a drum 2 provided with a number of scraping blades on an inner periphery thereof on a machine base 3 so as to freely rotate. It is supported and rotated at a predetermined speed by a driving device (not shown). Then, hot air is sent into the drum 2 from a burner 5 provided at the hot hopper 4 at one end of the drum 2, while exhaust gas is provided by an exhaust fan 8 provided downstream of the exhaust flue 7 connected to the cold hopper 6 at the other end. And the dust in the exhaust gas is captured by the dust collector 9 and then discharged from the chimney 10 into the atmosphere.
[0021]
Then, the aggregate properly discharged from the aggregate storage hopper (not shown) is fed into the drum 2 by the transport means 11 and brought into contact with the high temperature gas flow while rolling down the drum 2 while being scraped up by the scraping blades. It is heated to a desired temperature and discharged from the hot hopper 4 side.
[0022]
Reference numeral 12 denotes a plant body in which devices having functions of sieving, storage, weighing, and mixing are stacked. The heated aggregate discharged from the new material dryer 1 is transferred to the plant body 12 by a conveying means 13 such as a bucket elevator. Is supplied to the uppermost vibration sieve 14, sorted according to particle size, and stored in the lower aggregate storage bottle 15. Then, the aggregate stored in the aggregate storage bin 15 is weighed in a predetermined amount in the lower weighing tank 16, and is sent out to the mixer 17 together with separately measured asphalt and the like, and mixed for a predetermined time to produce an asphalt mixture.
[0023]
Reference numeral 18 denotes an asphalt pavement waste dryer installed when reclaiming asphalt pavement waste. The asphalt pavement waste dryer 18 has substantially the same structure as that of the new material dryer 1 and includes an inner peripheral portion. A drum 19 provided with a large number of scraping blades is rotatably supported on a machine base 20 and is rotated at a predetermined speed by a driving device (not shown). Hot air is fed into the drum 19 from the burner 22 disposed on the side 21 through the combustion chamber 23, while the exhaust flue 25 connected to the cold hopper 24 at the other end is connected to the exhaust flue 7 of the new material dryer 1. The exhaust gas is sucked by the exhaust fan 8 after being joined.
[0024]
Then, the asphalt pavement waste appropriately discharged from the waste material storage hopper (not shown) is fed into the drum 19 by the transport means 26, and the high temperature gas flow is generated while rolling down the drum 19 while scooping up with the scraping blades. It is heated to the desired temperature through contact.
[0025]
The asphalt pavement waste material heated by the asphalt pavement waste material dryer 18 is transported to a waste material storage bin 28 by an appropriate transport means 27 and stored, and a predetermined amount is weighed in a lower measuring tank 29 and delivered to the mixer 17. The asphalt mixture in which the asphalt pavement waste is mixed is manufactured by mixing with the aggregate discharged from the aggregate storage bin 12.
[0026]
Next, the apparatus added in order to recycle | regenerate a concrete waste material is demonstrated.
[0027]
30 is a mortar peeling device that rubs the heated concrete waste together to peel off the mortar attached to the surface of the aggregate. The mortar peeling device 30 is, for example, a rod mill, a ball mill, a mixer, etc. The apparatus is not limited to this, and any apparatus may be used as long as it can rub off concrete mortar and peel off the mortar attached to the aggregate surface.
[0028]
31 is a path switching means for switching the flow of the material discharged from the new material dryer 1 to the mortar peeling device 30 side, and the path switching means 31 transfers the material to the plant main body 12 or the mortar by switching operation of a damper or the like. It can be selectively supplied to either one of the peeling devices 30.
[0029]
The material discharged from the mortar peeling device 30 is supplied to the asphalt pavement waste material dryer 18 by an appropriate conveying means 32.
[0030]
33 is a switch for switching the flow of the material discharged from the asphalt pavement waste dryer 18 to the conveying means 34 side such as a bucket elevator and supplying the material to the vibration sieve of the plant main body 12. The path switching means 33 is a damper or the like. The material can be selectively supplied to either the vibrating sieve 14 of the plant main body 12 or the waste material storage bin 28 by the switching operation.
[0031]
Therefore, when separating and recovering the aggregate from the concrete waste, after all the aggregate stored in the aggregate storage bottle 15 at the time of manufacturing the asphalt mixture is extracted, the path switching means downstream of the new material dryer 1 31 and the path switching means 33 downstream of the waste material dryer 18 are operated to switch the material flow to the side indicated by the solid line. Then, the concrete waste material crushed to an appropriate size, for example, a particle size of 20 mm or less, is supplied to the new material dryer 1 by the transport means 11, and hot air is sent from the burner 5 into the drum 2 to bring the concrete waste material to an appropriate temperature of 100 ° C. For example, heating to about 300 ° C. As a result, the mortar in the concrete waste material becomes brittle, and the mortar easily peels off from the aggregate surface due to the difference in thermal expansion coefficient between the aggregate and the mortar.
[0032]
The concrete waste material heated by the new material dryer 1 is then supplied to the mortar peeling device 30 by the path switching means 31. In this mortar peeling apparatus 30, the mortar is peeled off from the aggregate surface by rubbing the aggregates.
[0033]
The concrete waste material ground by the mortar peeling device 30 is then supplied to the asphalt pavement waste material dryer 18. In the asphalt pavement waste material dryer 18, suction exhaust is performed by the exhaust fan 8, and while the concrete waste material rolls down in the drum 19, fine components such as mortar in the concrete waste material are sucked by the exhaust fan 8 to the dust collector 9. And capture. The fines captured by the dust collector 9 are collected in a dedicated storage silo (not shown) so as not to be mixed with the dust during the asphalt mixture production.
[0034]
The aggregate from which fines have been removed by the asphalt pavement waste dryer 18 then flows to the conveying device 34 side by the path switching means 33 and is supplied to the vibrating sieve 14 at the top of the plant body 12 by the conveying device 34. . In the vibration sieve 14, the aggregate is sieved for each predetermined particle size and stored in the lower aggregate storage bin 15. Aggregate stored in the aggregate storage bin 15 is taken out by passing through the measuring tank 16 and the mixer 17 for each particle size, and stored in a storage facility in the field for reuse.
[0035]
As described above, the heating process of heating the concrete waste material with the new dryer 1, the mortar peeling process of grinding the heated concrete waste material with the mortar peeling device 30, and the asphalt pavement waste material with the fine content in the ground concrete waste material. By passing through each process of the fine part separation process which separates by the suction exhaust with the exhaust fan with the air dryer 18 and the sieving process in which the aggregate from which the fine part has been separated is screened according to the particle size by the vibration sieve 14 of the plant body 12 Aggregates with little mortar adhesion can be recovered by particle size. This method and equipment for recycling concrete waste can be realized by adding a few devices to the asphalt plant, making it possible to recycle concrete waste with low capital investment. The asphalt plant is also used for both asphalt mixture production and concrete waste recycling. It becomes a plant and the operating rate is improved, which is economically convenient.
[0036]
【The invention's effect】
As described above, according to the method for reclaiming concrete waste using the asphalt plant according to the present invention, the heating step of supplying the concrete waste to the new material dryer of the asphalt plant and heating it to a predetermined temperature, and the heated concrete waste Mortar peeling process to feed the mortar on the aggregate surface by supplying the mortar to the mortar peeling device, and the fine parts to separate the fine parts by supplying the concrete waste material from which the mortar has been peeled off to the asphalt pavement waste material dryer and sucking and exhausting it with a blower Separation process and a sieving process in which the aggregate discharged from the asphalt pavement waste dryer is supplied to the vibration sieve of the plant body and sieved according to the particle size, so it is necessary to add concrete equipment to the asphalt plant. Waste materials can be recycled, and concrete waste can be invested at low cost. Of it can enable the playback.
[0037]
Further, according to the concrete waste recycling apparatus according to the present invention, the aggregate is supplied to the new dryer and heated, and the aggregate is stored by sieving the heated aggregate according to the particle size with the vibration sieve at the top of the plant body. While being stored in the bins, the asphalt pavement waste dryer is supplied and heated to the asphalt pavement waste dryer, and the heated waste is stored in the waste storage bins, and a predetermined amount of aggregate is discharged from each of the storage bins to the mixer. Asphalt plant which manufactures asphalt mixture by adding and adjusting mixing, equipped with mortar peeling device to peel off mortar on aggregate surface by rubbing heated concrete waste material, and concrete discharged from new material dryer A path switching means for supplying the waste material to the mortar peeling device, and a co Because there is a transport means for transporting the cleat waste to the asphalt pavement waste dryer and a path switching means for supplying the concrete waste discharged from the asphalt pavement dryer to the vibration sieve of the plant body, the mortar is peeled off from the asphalt plant. It is economical because it can be used for both asphalt mixture production and concrete waste recycling simply by installing additional equipment and a few other auxiliary equipment.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Dryer for new materials 8 ... Ventilator 9 ... Dust collector 12 ... Plant main body 14 ... Vibrating sieve 15 ... Aggregate storage bin 18 ... Dryer for asphalt pavement waste material 27 ... Waste material storage bin 30 ... Mortar peeling device 31, 33 ... Path switching Means 2, 34 ... conveying means

Claims (2)

Supplying concrete waste to a dryer for new materials in an asphalt plant and heating it to a predetermined temperature, supplying the heated concrete waste to a mortar peeling device and peeling the mortar on the surface of the aggregate, and mortar The separated concrete waste material is supplied to the asphalt pavement waste dryer and the fine components are separated by suction exhaust using an exhaust fan, and the aggregate discharged from the asphalt pavement dryer is used as the vibration sieve of the plant body. A method for reclaiming concrete waste using an asphalt plant, comprising a sieving step of supplying and sieving according to particle size. Aggregate is supplied to the dryer for the new material and heated, and the heated aggregate is screened according to the particle size by the vibration sieve at the top of the plant body and stored in the aggregate storage bin, while the asphalt pavement waste material is stored in the asphalt pavement waste material dryer. Asphalt for producing an asphalt mixture by storing the heated waste material in waste material storage bins, discharging a predetermined amount of aggregate from each storage bin to a mixer, adding asphalt and adjusting the mixing The plant is equipped with a mortar peeling device that rubs the heated concrete waste material and peels off the mortar on the surface of the aggregate, and a path switching means for supplying the concrete waste material discharged from the dryer for new material to the mortar peeling device, and mortar Transporting concrete waste discharged from the peeling equipment to a dryer for asphalt pavement waste That the transport means, the reproduction apparatus of the concrete waste, characterized in that a means switching path for supplying the vibrating screen plant body concrete waste discharged from asphalt pavement waste for dryer.

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