JP4056328B2 - Raw concrete production equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for producing ready-mixed concrete that uses a crushed concrete lump generated by dismantling of a concrete structure as an aggregate equivalent.
[0002]
[Prior art]
In recent years, from the viewpoint of effective use of resources, it is possible to crush a concrete lump that is generated when demolishing a concrete structure, and to use all the fine particles and coarse particles obtained by crushing as aggregates for ready-mixed concrete. It has been proposed and put into practical use. Specifically, the concrete mass accumulated from the site of demolition of the concrete structure is crushed by a crusher, and the crushed material, water and cement are put into a mixer at a certain blending ratio and kneaded to prepare ready-mixed concrete. Manufacturing is performed (for example, refer patent document 1). In addition, as a crusher which crushes a concrete lump, existing crushers, such as a jaw crusher, a cone crusher, and a roll crusher, are used.
[0003]
Further, a step of crushing the concrete mass, the scraped off entirely mortar layer adhering to the coarse aggregate surface mutually collide in a vertical cylinder rotates eccentrically crushed each other obtained by the process To obtain a recycled coarse aggregate, and after passing through this process, the remaining material is separated into fine aggregate, powder and fine powder by wind separation in a rotating drum, and recovered bone is obtained. It is also practiced to use a material as an aggregate for ready-mixed concrete (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
JP 2001-130944 A (pages 2 to 3, FIG. 4).
[Patent Document 2]
Japanese Patent Publication No. 6-30755 (pages 3 to 5, FIG. 2).
[0005]
[Problems to be solved by the invention]
However, as in the former case, most of the large amount of crushed material is the surface of the original aggregate by simply crushing the concrete lump generated when the concrete structure is demolished using a conventional crusher such as a jaw crusher. The shape of the mortar layer adhering to the corners and cracks protruding at an acute angle, or the shape of the corners and cracks as described above in part of the small-diameter lump-shaped cured mortar piece However, if this crushed material is used as it is as an aggregate of ready-mixed concrete, there is a problem in that these corners and cracks become weak parts to reduce the strength of the concrete.
[0006]
Such a problem can be solved by removing all the hardened mortar adhering to the original aggregate and using it as a recycled aggregate, as in the latter case, but this greatly increases the regeneration process of the aggregate. Not only does it take time and money, but a large amount of fine powder is generated, which makes it difficult to process, and there is a problem that it is impossible to effectively use the waste concrete block.
[0007]
The present invention has been made in view of the above-described problems, and the object of the present invention is the above-mentioned corners and cracks that become weak parts in the crushed material of a concrete block generated by the dismantling of a concrete structure or the like. An object of the present invention is to provide an apparatus for producing ready-mixed concrete that obtains concrete having stable strength by separating parts and reusing the crushed material as an aggregate.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an apparatus for producing ready-mixed concrete according to claim 1 of the present invention includes a crushing unit for crushing a concrete lump and a chamfered corner portion of a mortar portion of a crushed concrete material provided downstream of the crushing unit. An apparatus for producing ready-mixed concrete comprising a chamfering means and a kneading unit for mixing water and cement with the crushed chamfered material provided downstream of the chamfering means, wherein the chamfering means crushes one end. the object receiving the open end, consists rotation trommel cylindrical which is gradually inclined downward toward the other end and from the one end to form the other end to the openable outlet, below the rotating trommel, a rotating trommel configured to weigh the fine powder amount of the storage container with are disposed container of powder separated from the concrete crushed to screened out through sieve eyes from It is characterized in that was.
[Action]
[0009]
First, waste concrete lump generated by demolition of a concrete structure is put into a crushing mechanism and crushed. In this case, it is desirable to use a jaw crusher as a crushing mechanism in order to crush a large amount of concrete in a short time. The crushed material crushed by this crushing mechanism has a shape formed by enveloping the original aggregate with a hardened mortar layer, and a shape of a crushed piece of hardened mortar, and most of these crushed materials. In a part of the mortar portion, a corner portion or a crack that protrudes acutely during crushing occurs. Therefore, if the crushed material is used as an aggregate as it is, the corners and cracks become weak parts and the strength of the concrete is reduced. Or by chamfering the part where the crack is generated.
[0010]
As the chamfering means , by stirring a certain amount of crushed material and causing them to rub against each other or collide with each other, the above-mentioned corners made of hardened mortar of the crushed material are divided or cracked portions are formed. The surface of the mortar surface layer part in the crushed material is separated from the crack part, and the rounded surface from which corners and the like are cut off, that is, the weak body part is removed. As such a chamfering means , it is preferable to employ a cylindrical rotating trommel arranged in a gently inclined state from one end side to the other end side, and a certain amount of the concrete crushed by the crushing mechanism. By crushing the crushed material into one end opening of the rotating trommel and rotating the trommel, the chamfering process is performed to separate the corners and cracks as described above while stirring and disturbing the crushed material. Is.
[0011]
During the chamfering process, when the corner part is divided from a crushed material into small-diameter mortar pieces or when a part from the crack part is separated into small-diameter mortar pieces, the mortar particles are separated from the cross-section or separation surface. While exfoliating to become a fine powder, a part of the chamfered crushing part surface and the above-mentioned small-diameter lump-like mortar pieces rub against each other or collide with each other by agitation to scrape off some of the mortar particles on the surface. These fine powders are sieved through the rotating trommel sieves, while the crushed and small-diameter mortar pieces that have been rounded and in the optimum chamfered state are discharged downward from the other end of the trommel. And received in the kneading section.
[0012]
This kneading part is composed of a kneading tank equipped with stirring blades and the like, and a predetermined amount of water and cement corresponding to a certain amount of crushed material including the small-diameter massive mortar pieces are put into this kneading tank and kneaded. To produce ready-mixed concrete with stable strength.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an apparatus for producing ready-mixed concrete, a crushing means 1 for crushing a concrete lump A generated by demolition of a concrete structure, The crushed material chamfering means 3 disposed on the downstream side of the crushing means 1 via the crushed material conveying means 2, and the chamfered fixed amount of chamfered material and water disposed on the downstream side of the chamfering means 3. And a kneading section 4 for kneading cement with cement.
[0014]
If each means in the ready-mixed concrete manufacturing apparatus comprised in this way is demonstrated in detail, you may use a cone crusher and a roll crusher as the said crushing means 1, but crush a lot of concrete blocks in a short time. Jaw crusher that can be used. Below the crushing means 1 made of the jaw crusher, a conveying means 2 made of a belt conveyor is disposed, and the concrete crushed material A ′ crushed by the crushing means 1 is opened below the crushing means 1. The crushed object discharge port 1a is configured to be supplied onto the conveyance start end portion of the conveyance means 2.
[0015]
The crushing material chamfering means 3 is disposed on the conveying terminal end side of the conveying means 2. The crushed material chamfering means 3 is composed of a cylindrical trommel (rotating sieve) provided with an infinite number of small-diameter sieves penetrating between the inner and outer surfaces, with one end opening facing the conveyance end of the conveyance means 2. The crushed material receiving opening 3a is formed at the discharge port 3b that is opened and closed by the opening / closing lid 5 and the other end is formed at the other end, that is, the crushed material receiving opening 3a through the discharge port 3b. It is configured to be gently inclined downward and to be rotated in the circumferential direction by appropriate rotating means (not shown).
[0016]
Below the chamfering means 3 made of trommel, there is disposed a hopper 6 for receiving fine powder a separated and screened from the surface layer portion of the hardened mortar layer of the concrete crushed material A ′. A storage container 76 for the fine powder a is disposed below the storage container 76.
[0017]
Further, a fine powder dropping port 6a in the hopper 6 facing the upper end opening of the storage container 7 is formed in a small-diameter cylindrical passage, and a suction blower 8 is placed in the dropping port 6a. The suction blower 8 generates a suction force in the hopper 6 to actively suck the fine powder a in the chamfering means 3 made of the above-mentioned trommel through the hopper 5 and through the dropping port 6a. While the storage container 7 is configured to be discharged into the storage container 7, the storage container 7 is configured to measure the amount of fine powder stored in the storage container 7 that is supported or placed on an appropriate weighing device (not shown). is doing.
[0018]
Further, the kneading part 4 comprising a kneading tank having a rotary stirring blade 9 provided therein is disposed below the crushed material discharge port 3b of the chamfering means 3, and is charged from the discharge port 3b of the chamfering means 3. A certain amount of the crushed material A ′ and a certain amount of water and cement corresponding to the amount of the crushed material A ′ are kneaded to produce green cotton cleats.
[0019]
Next, a method for producing ready-mixed concrete using the ready-mixed concrete manufacturing apparatus configured as described above will be described based on the flowchart shown in FIG. First, a quantity of concrete lump A necessary for producing a batch (one batch) of ready-mixed concrete is taken out from a stock yard (not shown), put into a crushing means 1 composed of a jaw crusher, and crushed by the crushing means 1. As a result, a crushed concrete A ′ is obtained.
[0020]
As shown in FIG. 3, the crushed material A ′ crushed by the crushing means 1 has hardened mortar attached to the surface of the original aggregate A1 made of gravel and the like, and the original aggregate A1 is formed by this hardened mortar layer A2. Or in the shape of a crushed piece of hardened mortar as shown in FIG. 5, in any case, in most of the crushed material A ′ In the mortar part, there is a case where a corner A3 protruding at an acute angle from the surface is partially present and a crack A4 is generated in a part of the thick part of the mortar part. Such corners A3 and cracks A4 are weak parts in the strength of the concrete.
[0021]
Therefore, the crushed material A ′ crushed by the crushing means 1 is not used as an aggregate as it is, but a fixed amount of crushed material A ′ is charged from the crushing means 1 to the chamfering means 3 made of trommel by the conveying means 2. After that, by rotating the chamfering means 3, the surface of the crushed material A ′ is chamfered by dividing or separating the mortar portion where the corners A3 and cracks A4 are generated from the crushed material A ′. Is.
[0022]
That is, when the chamfering means 3 is rotated, the crushed material A ′ is agitated and collides with the inner peripheral surface of the chamfering means 3 or is hardened in which a crack portion A4 is generated by the impact force when colliding with each other. The mortar part separates from the cracked part, and the corner A3 also cracks due to the impact force and is divided from the cracked part to form a small-diameter mortar piece A '', which is separated and separated. Sometimes, part of the mortar particles are peeled off from the cross section or separation surface and scattered as fine powder a, and the mortar pieces A '' and the crushed material chamfered by cutting the mortar pieces A ''. A 'is slidably contacted so that the protruding portion in the surface portion of the mortar is removed and separated as fine powder a. As shown in FIGS. 4 and 6, the mortar surface layer of the crushed material A ′ and the mortar piece A ″ The surface of the part is rounded.
[0023]
Thus, the fine powder a separated from the crushed material A ′ and the mortar piece A ″ is sieved into the lower hopper 6 through the sieve of the chamfering means 3 made of trommel, and into the cylindrical drop port 6a of the hopper 6. The fine powder a is positively sucked by the suction blower 8 provided in the container and discharged and stored in the storage container 6 disposed below. The amount of the fine powder a is extremely small compared to the amount of mortar adhering to the crushed material when it is put into the chamfering means 3, and most of the hardened mortar is extremely thick on the surface of the aggregate A1. The chamfering means 3 is gradually attached to the discharge port 3b side of the chamfering means 3 which is attached in the chamfered state as described above and remains gently as the mortar piece A '' and which is gently inclined downward. To go.
[0024]
The fine powder a stored in the storage container 6 is constantly weighed by a measuring device, and when the amount of the fine powder reaches a predetermined amount, that is, the crushed material A ′ and the mortar piece A ″. When the chamfering means 3 is in an optimum chamfered state as an aggregate , rotation of the chamfering means 3 is stopped, the discharge port 3b of the chamfering means 3 is opened, and the crushed material A ′ is used as a coarse aggregate as a small-diameter mortar piece A '' Is thrown into the tank of the kneading part 4 installed as a fine aggregate downward from the discharge port 3b.
[0025]
At this time, in order to detect that the crushed material A ′ and the mortar piece A ″ are in the optimum chamfered state in the chamfering means 3, the amount of fine powder obtained by conducting a chamfer test in advance is compared. Is done by doing. That is, in advance, a crush of a certain amount of concrete lump is chamfered as described above, the shape of the crushed material is observed, and the amount of fine powder generated during the chamfering process is measured to determine the optimal chamfered chamfer. The amount of fine powder when the shape is obtained is obtained, and the amount of fine powder and the amount of fine powder stored in the storage container 6 are compared, whereby the amount of fine powder in the storage container 6 is determined in advance. The time when the amount corresponding to the amount of fine powder is reached is detected as the optimum chamfering state as an aggregate .
[0026]
When the amount of crushed material to be chamfered by being put into the chamfering means 3 has several times the amount of the above-mentioned concrete crushed material to be chamfered until an optimum chamfered shape is obtained in advance, the storage container The rotation of the chamfering means 3 may be stopped when the amount of fine powder in 6 becomes several times the amount of fine powder determined in advance.
[0027]
The crushed material A ′ and the mortar piece A ″ put into the tank of the kneading unit 4 are used as aggregates, and water and cement are mixed in the tank of the kneading unit 4 at a certain ratio with respect to the aggregates. Raw concrete is produced by adding and kneading.
[0028]
In general, when a concrete lump generated when demolishing a concrete structure is crushed and the particle size distribution of the crushed concrete is measured, the amount of coarse aggregate is larger than that of ordinary concrete aggregate. Although a considerable amount is reduced, as described above, a large-diameter crushed material A 'obtained by crushing the concrete block A is put into the trommel which is the chamfering means 3, and the corner A3 is divided and cracks are generated. In this case, since it is separated from the cracked portion A4 to form a small-diameter mortar piece A '' as described above, the proportion of fine aggregate is increased and ready-mixed concrete with good workability Can be manufactured.
[0029]
【The invention's effect】
As described above, according to the ready-mixed concrete production apparatus of the present invention, the concrete lump crushing means and the corners of the mortar portion of the concrete crushing material provided on the downstream side of the crushing means as described in claim 1. A chamfering means for chamfering a part and a kneading part for kneading water and cement to the chamfered chamfered material provided downstream of the chamfering means. After a certain amount of is put into the crushing means, the crushing of the concrete lump by the crushing means is followed by chamfering of the crushed material by the chamfering means, and the crushed material, water, and cement in the kneading unit are stirred and mixed by kneading. Concrete can be manufactured efficiently and smoothly.
[0035]
Further, as the chamfering means, a cylindrical rotating trommel having one end formed as a crushed material receiving opening end and the other end formed as an openable / closable outlet and gently inclined downward from one end to the other end is adopted. Therefore, not only can a large amount of crushed material be introduced into the trommel at once, but the chamfering process can be performed, as well as the crushed materials collide with each other by rotating the trommel and the crushed material is Colliding with the surface, it is possible to divide the corners projecting to the surface layer portion of the crushed material by the impact force or to separate the crack portion where the crushed material is generated from the crack portion, When the crushed material is used as an aggregate, the weak body portion is reliably removed, and ready-mixed concrete having stable strength can be manufactured.
[0036]
In addition, since the corner part cut off from the surface layer part of the crushed material can be used as a fine aggregate, the fine bone which is usually insufficient in the recycled aggregate made of concrete crushed material by the fine aggregate made of this corner part. The amount of material can be increased, and therefore, ready-made concrete with good workability can be produced.
[0037]
Further, a storage container for fine powder to be screened out from the inside of the rotary trommel is arranged below the rotary trommel, and the fine powder amount in the storage container is measured. By comparing the amount and the amount of fine powder obtained in advance when the crushed material has an optimum chamfered shape, the crushed material that has been chamfered to the optimum shape to achieve excellent strength can be accurately obtained. And can be obtained easily.
[Brief description of the drawings]
FIG. 1 is a simplified side view of an apparatus for producing ready-mixed concrete.
FIG. 2 is a flowchart showing a process for producing ready-mixed concrete.
FIG. 3 is a cross-sectional view of a crushed material in which a hardened mortar layer is deposited on the surface of the original aggregate.
FIG. 4 is a cross-sectional view of the crushed material in a chamfered state.
FIG. 5 is a cross-sectional view of a crushed material composed of massive crushed pieces of hardened mortar.
FIG. 6 is a cross-sectional view showing a state in which the crushed material is chamfered.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crushing means 2 Crushed material conveyance means 3 Chamfering means 4 Kneading part 7 Fine powder storage container A Concrete lump a Fine powder
A 'crushed material
A '' pieces of mortar
A1 Original aggregate
A2 Hardened mortar layer
A3 Corner
A4 crack

Claims (1)

Concrete crushing means, chamfering means for chamfering the corners of the mortar part of the concrete crushed material provided on the downstream side of the crushing means, and crushing chamfered material provided on the downstream side of the chamfering means for water. And a kneading part for kneading the cement, wherein the chamfering means has one end formed as an open end for receiving crushed material and the other end as a discharge opening that can be opened and closed, and the other end from the other end. It is composed of a cylindrical rotating trommel that is gently inclined downward, and a storage container for fine powder separated from the concrete crushed material that is screened out from the inside of the rotating trommel through the sieve is disposed below the rotating trommel. And an apparatus for producing ready-mixed concrete that is configured to measure the amount of fine powder in the storage container.

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