JP2006298742A - Apparatus for manufacturing regenerated aggregate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing regenerated aggregate which is capable of efficiently and continuously manufacturing the regenerated aggregate free from the variation of water absorption and having a fixed quality using returned concrete or waste concrete aggregate as a raw material. <P>SOLUTION: The apparatus is provided with a perforated outer cylinder 1 having dehydrating holes 13 formed on a shell wall and a screw shaft 2 arranged in the perforated outer cylinder to rotate with the rotation speed different from the perforated outer cylinder. The raw material supplied to a raw material supply part 11 is dehydrated by the centrifugal force of the perforated outer cylinder, is scraped from the inner peripheral surface of the perforated outer cylinder by the screw shaft and is carried in the perforated outer cylinder while being stirred to discharge the regenerated aggregate formed by binding the aggregate and fine particles in the raw material with cement from an aggregate discharge part 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for continuously producing recycled aggregate from raw raw concrete remaining in an agitator truck and waste concrete material.

  Conventionally, as a continuous centrifuge, a porous outer cylinder having a dewatering hole formed in a body wall and a screw shaft disposed in the porous outer cylinder are provided, and a rotational difference between the porous outer cylinder and the screw shaft is obtained. By holding and rotating, the water-containing raw material supplied from one end of the porous outer cylinder is dewatered by the centrifugal force of the porous outer cylinder and scraped and stirred from the inner peripheral surface of the porous outer cylinder by the screw shaft. A structure in which the inside of the outer cylinder is transferred and discharged from the other end of the porous outer cylinder is known (see Patent Document 1).

  However, this continuous centrifuge is only for the purpose of separating solid particles and moisture, and has no function of producing recycled aggregate by combining aggregates and fine particles with cement.

By the way, the ready-mixed concrete is usually transported to the construction site or civil engineering site by an agitator truck (unmixed mixer truck) and unloaded, but depending on the case, a large amount of the remaining remains in the ready-mixed concrete or unloading is not possible. Or take it home.
Such return raw concrete is discarded or used as roadbed material or roadbed material, but since this return concrete contains moisture, it is dried by sun drying or washed with water. There was a problem in that it was necessary to reuse it later, and it took time and effort.

  Conventionally, a method for producing recycled aggregate using waste concrete aggregate obtained by crushing concrete waste as a raw material is known (see Patent Document 2).

  This method for producing recycled aggregate is to obtain waste concrete aggregate, recycled aggregate in which fine particles are combined with cement by mixing and stirring the cement and water in the fine particles. It is.

However, in this method for producing recycled aggregate, the amount of water absorption of the waste concrete aggregate to be used varies, so that the amount of water is not constant, and there remains a problem that the quality of the produced recycled aggregate is likely to vary. It was.
JP-A-5-184972 JP 2002-193646 A

The present invention makes it possible to efficiently and continuously produce recycled aggregate using return concrete as a raw material.
Another object of the present invention is to provide a reclaimed aggregate production apparatus that can produce a regenerated aggregate of a constant quality efficiently and continuously with no variation in water absorption using waste concrete aggregate as a raw material.

In order to solve the above problems, the recycled aggregate production apparatus of the present invention (Claim 1)
It is a recycled aggregate production device using at least a raw raw mix containing water, coarse aggregate, fine aggregate, fine particles and cement,
A raw material supply part is formed at one end part, an aggregate discharge part is formed at the other end part, and a porous outer cylinder in which a dewatering hole is formed in the trunk wall;
A screw shaft disposed in the porous outer cylinder so as to rotate with a rotational difference with respect to the porous outer cylinder;
The raw material by moving the inside of the porous outer cylinder so as to scrape and stir from the inner peripheral surface of the porous outer cylinder by the screw shaft while dehydrating the return raw material supplied to the raw material supply unit by the centrifugal force of the porous outer cylinder. Recycled aggregate in which coarse aggregate, fine aggregate, and fine particles were bonded with cement was discharged from the aggregate discharge section.

Moreover, the recycled aggregate production apparatus of the present invention (Claim 2)
Recycled aggregate production equipment using water-containing waste concrete aggregate mixed with at least water, waste concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles, cement,
A porous outer cylinder in which a raw material supply part is formed at one end, an aggregate discharge part is formed at the other end, and a dewatering hole is formed in the trunk wall;
A screw shaft disposed in the porous outer cylinder so as to rotate with a rotational difference with respect to the porous outer cylinder;
The inside of the porous outer cylinder is transferred so that the water-containing waste concrete aggregate raw material supplied to the raw material supply section is scraped and stirred from the inner peripheral surface of the porous outer cylinder by the screw shaft while dewatering by the centrifugal force of the porous outer cylinder. Thus, the recycled aggregate obtained by combining the waste concrete coarse aggregate, the waste concrete fine aggregate, and the waste concrete fine particles in the raw material with cement is discharged from the aggregate discharge portion.

Moreover, the recycled aggregate production apparatus of the present invention (Claim 3)
In the recycled aggregate manufacturing apparatus according to claim 1 or 2, a cement supply unit is provided in the middle of a transfer path by the screw shaft, and cement is added from the cement supply unit.

Further, the recycled aggregate production apparatus of the present invention (Claim 4)
Recycled aggregate production equipment using water-containing waste concrete aggregate mixed with at least water, waste concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles,
A raw material supply part is formed at one end part, an aggregate discharge part is formed at the other end part, and a porous outer cylinder in which a dewatering hole is formed in the trunk wall;
A screw shaft disposed in the porous outer cylinder so as to rotate with a rotational difference with respect to the porous outer cylinder;
A cement supply part provided in the middle of the transfer path by the screw shaft,
While the water-containing waste concrete aggregate raw material supplied to the raw material supply unit is dewatered by the centrifugal force of the porous outer cylinder, the screw shaft is used to scrape and stir from the inner peripheral surface of the porous outer cylinder and to move the inside of the porous outer cylinder. , By adding cement from the cement supply section, the recycled aggregate in which the raw concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles in the raw material are combined with cement is discharged from the discharge section did.

Moreover, the recycled aggregate production apparatus of the present invention (Claim 5)
The recycled aggregate manufacturing apparatus according to any one of claims 1 to 4, wherein a non-perforated body wall portion is formed at a transfer terminal side portion of the porous outer cylinder.

Moreover, the recycled aggregate production apparatus of the present invention (Claim 6)
5. The recycled aggregate manufacturing apparatus according to claim 3 or 4, wherein the cement supply part is formed in the shaft of the screw shaft from the shaft end surface to the middle of the shaft, and opens from the back end of the supply passage to the outer periphery of the shaft. It was set as the structure currently formed by the made supply port.

In the recycled aggregate production apparatus of the present invention (Claim 1), the recycled aggregate can be produced using the return raw kon.
That is, the regenerated aggregate manufacturing apparatus of the present invention has a continuous centrifugal separation function, and the water content of the return raw kon raw material supplied to the raw material supply unit is dehydrated by the centrifugal force of the porous outer cylinder, The surface becomes wet.
At the same time, it is scraped off from the inner peripheral surface of the porous outer cylinder by the screw shaft, and is rotated by the rotation of the screw shaft, so that it is transferred while being stirred in the porous outer cylinder, at this time, the coarse aggregate in the raw material, Fine aggregate and fine particles are combined with cement to continuously produce recycled aggregate, and this recycled aggregate is discharged from the aggregate discharge section as product aggregate.

  And the recycled aggregate manufactured with the recycled aggregate manufacturing apparatus of the present invention is a recycled aggregate that uses the recycled raw concrete and waste concrete aggregate that has been conventionally disposed of, and that was in trouble with the disposal, It is possible to reuse concrete resources.

In the recycled aggregate production apparatus of the present invention (Claim 2), recycled aggregate can be produced using hydrous waste concrete aggregate as a raw material.
Water-containing waste concrete aggregate is a mixture of at least water, waste concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles, cement, and water is mixed before being supplied to the device of the present invention. The water absorption of the waste concrete aggregate can prevent variations in various ways.
In addition, since the dewatering treatment is performed, the water absorption rate of the waste concrete aggregate can be made constant, and a regenerated aggregate with a certain quality in which these are combined with cement can be manufactured.

Moreover, the recycled aggregate production apparatus of the present invention (Claim 3)
In the middle of the transfer path by the screw shaft, the cement is added from the cement supply section. At the time of the cement addition, the moisture in the raw material is dehydrated (the surface of the aggregate is moist), so Aggregates are unraveled and transported while being stirred.
Because cement is added in such a state, the adhesive strength of cement is fully exerted, and cement is mixed evenly in the raw material to produce recycled aggregate in which aggregates and fine particles are securely bonded by cement. it can.

In the recycled aggregate production apparatus of the present invention (Claim 4), the hydrated waste concrete aggregate as a raw material is not initially mixed with cement.
Therefore, the cement is added from the cement supply part in the middle of the transfer path by the screw shaft, and thereby, a recycled aggregate in which the waste concrete aggregate and the fine particles are reliably combined with the cement can be manufactured.

  Further, the regenerated aggregate manufacturing apparatus of the present invention (Claim 5) is such that a non-porous body wall portion is formed at the transfer end side portion of the porous outer cylinder, and at the transfer end side portion, the final stage of forming the regenerated aggregate. Therefore, it is not necessary to dehydrate. The non-perforated body wall can be scraped and stirred without being dehydrated.

  Moreover, the recycled aggregate manufacturing apparatus of the present invention (Claim 6) includes a supply passage in which a cement supply portion is formed in the shaft of the screw shaft from the shaft end surface to the middle of the shaft, and from the back end of the supply passage to the outer periphery of the shaft. This is an embodiment of a cement supply unit formed by an open supply port.

Return raw concrete, which is an example of the raw material of the recycled aggregate production apparatus of the present invention, is a raw mix in which crushed stone (coarse aggregate), sand (fine aggregate), fine particles, cement, and water are blended at a predetermined designed ratio. Although it is concrete, it is transported to the construction site or civil engineering site by an agitator truck, but it was taken home as it was without being unloaded at the site.
In addition, there is no special restriction | limiting in the kind of cement as a return raw concrete, Various cements defined in JIS, such as a Portland cement system and a mixed cement system, and special cements other than JIS regulations can be used.
A material obtained by mixing separately prepared waste concrete aggregate and / or virgin aggregate can be used as a raw material.

Moreover, the hydrated waste concrete aggregate which is an example of the raw material of the recycled aggregate production apparatus of the present invention is a mixture of at least water, waste concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles, There are cases where the cement is mixed and the cement is not initially mixed.
As the waste concrete aggregate, a waste concrete aggregate having a particle size of 20 mm or under, or a waste concrete aggregate having a particle size of 40 mm or under can be used.
What mixed this hydrated waste concrete aggregate with virgin aggregate can be used as a raw material.
The waste concrete aggregate is obtained by crushing concrete waste. In this case, iron waste, plastic waste, paper waste, wood waste, etc. are selected and removed from the concrete glass, and then the concrete waste and mud are separated. To classify.
Then, the concrete waste material is primarily crushed with a jaw crusher or the like, and then secondarily crushed with an impeller, a bar mac or the like to obtain a waste concrete aggregate.

In addition, as a waste concrete aggregate, the thing of the state which grind-processed this and took the squareness of the outer peripheral surface can be used.
This grinding process is not necessarily required, and raw material aggregates that are not ground may be used.

Further, a strength enhancer (for example, silica fume) can be added to the raw material.
When this strength enhancer is added, the strength enhancer penetrates into the aggregate together with water, so that the bond strength can be improved.
In addition, as a method for adding the strength enhancer, it may be mixed in the raw material in advance, or may be added together with cement from a cement supply part provided in the middle of the transfer path.

In addition, it is optional to rub the reclaimed aggregates produced by the reclaimed aggregate production apparatus of the present invention and process them into a polished reclaimed aggregate whose surface has been polished.
Further, the produced recycled aggregate can be used as it is or classified and used as concrete aggregate or road base aggregate.
Moreover, it is arbitrary to mix and use this recycled aggregate and existing aggregate (sea sand, river sand, crushed sand, crushed stone) as necessary.

FIG. 1 is a cross-sectional view showing a first embodiment of the recycled aggregate production apparatus of the present invention.
In the figure, 1 is a porous outer cylinder, a raw material supply part 11 is formed at one end, an aggregate discharge part 12 is formed at the other end, and a dewatering hole 13 is formed at the trunk wall.
The porous outer cylinder 1 is formed with a raw material supply part 11 by a non-hole taper part 1b that is gradually expanded in diameter from the opening part toward one end of the straight body part 1a, and an opening part at the other end of the straight body part 1a. The aggregate discharge part 12 by the non-hole taper part 1c gradually reduced in diameter toward is formed.
A number of punch holes 13a are formed in the straight body portion 1a, and a mesh body 13b is stretched on the inner peripheral surface of the body wall. From the punch holes 13a through the mesh of the mesh body 13b. A dewatering hole 13 is formed so as to be drained.
Further, a non-pierced barrel wall portion 1d is formed on the transfer terminal side portion of the straight barrel portion 1a. The non-hole barrel wall portion 1d is not always necessary, and the dewatering hole 13 may be formed in the entire straight barrel portion 1a.

A screw shaft 2 is disposed inside the porous outer cylinder 1 so as to rotate with a rotational difference with respect to the rotation of the porous outer cylinder 1.
In addition, the porous outer cylinder 1 and the screw shaft 2 are rotationally driven by appropriate driving means, and the specific rotational driving structure is not shown.

A cement supply unit 3 is provided in the middle of the transfer path 20 by the screw shaft 2.
The cement supply unit 3 is formed by a supply passage 3a formed in the shaft of the screw shaft 2 from the shaft end surface to the middle of the shaft, and a supply port 3b opened from the back end of the supply passage 3a to the outer periphery of the shaft. Cement separately prepared from the supply unit 3 is added to the raw material in the porous outer cylinder 1.

  A raw material hopper 4 is provided facing the raw material supply unit 11, and the raw material in the raw material hopper 4 is supplied to the raw material supply unit 11 through a gap between the porous outer cylinder 1 and the screw shaft 2. .

  A discharge chute 5 is provided in connection with the aggregate discharge part 12, and the regenerated aggregate manufactured inside the porous outer cylinder 1 is discharged from the aggregate discharge part 12 into the discharge chute 5 by the screw shaft 2, The discharge chute 5 is withdrawn to a predetermined place.

  A drainage casing 6 is provided so as to surround the porous outer cylinder 1, and the water dehydrated from the raw material by the centrifugal force generated by the rotation of the porous outer cylinder 1 is received and drained by the drainage casing 6. It has become.

Therefore, for example, when the raw raw kon is used as a raw material, the raw raw kon introduced into the raw material hopper 4 is supplied from the raw material hopper 4 to the raw material supply unit 11.
The return raw container supplied to the raw material supply unit 11 is dehydrated by the centrifugal force of the porous outer cylinder 1 and the surface of the aggregate becomes wet.
The dehydrated return raw material is scraped off from the inner peripheral surface of the porous outer cylinder 1 by the screw shaft 2 and is rotated along with the rotation of the screw shaft 2, so that it is transferred while being stirred in the porous outer cylinder 1. To go. At this time, coarse aggregate, fine aggregate, and fine particles in the raw material are combined with cement to continuously produce a recycled aggregate, and this recycled aggregate is used as a product aggregate from the aggregate discharge unit 12 to the discharge chute 5. It will be discharged.

  Moreover, since cement is added from the cement supply part 3 in the middle of the transfer path 20 by the screw shaft 2, the adhesive strength by the cement is sufficiently exerted, and the cement is evenly mixed in the raw material, and the aggregate is made by the cement. Thus, it is possible to produce a regenerated aggregate in which fine particles are reliably bonded.

  In addition, also when using a water-containing waste concrete aggregate as a raw material, it is manufactured to a recycled aggregate by the same action as the above-mentioned return raw concrete.

Next, FIG. 2 is a sectional view showing a second embodiment of the recycled aggregate production apparatus of the present invention.
In this recycled aggregate manufacturing apparatus, the entire porous outer cylinder 1 is formed into a tapered cylinder whose diameter is gradually reduced from the raw material supply unit 11 to the aggregate discharge unit 12, and the raw material from the raw material hopper 4 is screwed The material is supplied to the material supply unit 11 of the porous outer cylinder 1 from a material port 71 opened to the outer periphery of the shaft through a material passage 70 formed in the shaft 2 from the shaft end surface to the middle of the shaft.

In this way, when the entire porous outer cylinder 1 is formed into a tapered cylinder, the centrifugal force gradually decreases as it moves toward the aggregate discharging part 12, so that the dehydrating action can be gradually reduced. The raw material scraping and stirring action by the screw shaft 2 can be enhanced.
Further, when the tip of the blade of the screw shaft 2 is worn away due to wear, the clearance between the screw shaft 2 and the inner peripheral surface of the porous outer cylinder 1 is adjusted by moving the screw shaft 2 in the axial direction. be able to.
Other configurations and operations are the same as those in the first embodiment.

  In the present invention, the length and diameter of the porous outer cylinder and the screw shaft, the number of rotations, the difference in rotation, the material, the blade pitch of the screw shaft, the hole diameter of the dewatering hole, etc. can be appropriately determined depending on the processing amount, the type of raw material, etc. .

  It is sectional drawing which shows 1st Example of the reproduction | regeneration aggregate manufacturing apparatus of this invention.   It is sectional drawing which shows 2nd Example of the reproduction | regeneration aggregate manufacturing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Porous outer cylinder 1a Straight body part 1b Non-hole taper part 1c Non-hole taper part 1d Non-hole taper part 11 Raw material supply part 12 Aggregate discharge part 13 Dehydration hole 13a Punch hole 13b Mesh body 2 Screw shaft 20 Transfer path 3 Cement Supply part 3a Supply passage 3b Supply port 4 Raw material hopper 5 Discharge chute 6 Drain casing 70 Raw material passage 71 Raw material port

Claims (6)

It is a recycled aggregate production device using at least a raw raw mix containing water, coarse aggregate, fine aggregate, fine particles and cement,
A raw material supply part is formed at one end part, an aggregate discharge part is formed at the other end part, and a porous outer cylinder in which a dewatering hole is formed in the trunk wall;
A screw shaft disposed in the porous outer cylinder so as to rotate with a rotational difference with respect to the porous outer cylinder;
The raw material by moving the inside of the porous outer cylinder so as to scrape and stir from the inner peripheral surface of the porous outer cylinder by the screw shaft while dehydrating the return raw material supplied to the raw material supply unit by the centrifugal force of the porous outer cylinder. A recycled aggregate manufacturing apparatus, wherein a recycled aggregate obtained by combining coarse aggregate, fine aggregate, and fine particles in a cement is discharged from the aggregate discharge section. Recycled aggregate production equipment using water-containing waste concrete aggregate mixed with at least water, waste concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles, cement,
A porous outer cylinder in which a raw material supply part is formed at one end, an aggregate discharge part is formed at the other end, and a dewatering hole is formed in the trunk wall;
A screw shaft disposed in the porous outer cylinder so as to rotate with a rotational difference with respect to the porous outer cylinder;
The inside of the porous outer cylinder is transferred so that the water-containing waste concrete aggregate raw material supplied to the raw material supply section is scraped and stirred from the inner peripheral surface of the porous outer cylinder by the screw shaft while dewatering by the centrifugal force of the porous outer cylinder. The recycled aggregate is formed by discharging the recycled aggregate obtained by combining the waste concrete coarse aggregate, the waste concrete fine aggregate, and the waste concrete fine particles in the raw material with cement. Manufacturing equipment.   The regenerated aggregate manufacturing apparatus according to claim 1 or 2, wherein a cement supply unit is provided in the middle of a transfer path by the screw shaft, and cement is added from the cement supply unit. Recycled aggregate production equipment using water-containing waste concrete aggregate mixed with at least water, waste concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles,
A raw material supply part is formed at one end part, an aggregate discharge part is formed at the other end part, and a porous outer cylinder in which a dewatering hole is formed in the trunk wall;
A screw shaft disposed in the porous outer cylinder so as to rotate with a rotational difference with respect to the porous outer cylinder;
A cement supply part provided in the middle of the transfer path by the screw shaft,
While the water-containing waste concrete aggregate raw material supplied to the raw material supply unit is dewatered by the centrifugal force of the porous outer cylinder, the screw shaft is used to scrape and stir from the inner peripheral surface of the porous outer cylinder and to move the inside of the porous outer cylinder. , By adding cement from the cement supply section, the recycled aggregate in which the raw concrete coarse aggregate, waste concrete fine aggregate, waste concrete fine particles in the raw material are combined with cement is discharged from the discharge section A recycled aggregate manufacturing apparatus characterized by that.   The regenerated aggregate manufacturing apparatus according to any one of claims 1 to 4, wherein a non-porous body wall portion is formed at a transfer terminal side portion of the porous outer cylinder.   The said cement supply part is formed in the axis | shaft of a screw shaft from the supply path formed from the shaft end surface to the middle of the axis | shaft, and the supply port opened to the shaft outer periphery from the back end of this supply path. Recycled aggregate production equipment.

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