JP2003291132A - Manufacturing apparatus for ready-mixed concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain ready-mixed concrete good in workability by crushing concrete lumps so as to obtain a particle size distribution optimum for use as aggregate of ready-mixed concrete. <P>SOLUTION: Concrete lumps are primarily crushed in the first crushing part 1, and this primary crushed matter A is distributed and discharged to the first pipeline 4 and the second pipeline 5 by a distribution part 3 capable of changing a distribution ratio. The primary crushed matter A discharged to the first pipeline 4 is supplied to a temporary receiving hopper 8 as it is while the primary crushed matter A discharged to the second pipeline 5 is secondarily crushed by a second crushing part 6. The mixed crushed matter A2 of the primary crushed matter A and secondary crushed matter A1 is charged in a kneading part 9 from the temporary receiving hopper 8, and mixed with cement and water to manufacture ready-mixed concrete. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing ready-mixed concrete having good workability by using a crushed material of a concrete lump generated by dismantling of a concrete structure as an aggregate equivalent.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of effective utilization of resources, a lump of concrete generated when a concrete structure is dismantled is crushed, and all fine and coarse particles obtained by crushing are aggregates of raw concrete. Has been proposed and is being put to practical use. For example, as described in JP-A-2001-130944, concrete lumps accumulated from the site of dismantling a concrete structure are crushed by a crusher, and the crushed material, water and cement are mixed in a mixer with a constant mixing ratio. Raw concrete is manufactured by adding and kneading. As a crusher for crushing concrete blocks, an existing crusher such as a jaw crusher, a cone crusher, or a roll crusher is used.

[0003]

However, if the concrete lumps generated when the concrete structure is dismantled are crushed by using a conventional crusher such as a jaw crusher, the particle size distribution of the crushed products will be normal. It is difficult to stay within the prescribed aggregate distribution in concrete. For example, when the conventional crusher (jaw crusher) having a minimum blade width of 5 mm and a maximum blade width of 20 mm is used to crush a concrete block to the size of coarse aggregate, the particle size distribution of the total amount of crushed material, Fig. 7 shows a comparison of the particle size distribution when the aggregate used in concrete is 45% fine aggregate.
As shown in, the crushed material has more coarse aggregate and less fine aggregate than ordinary concrete aggregate.

Therefore, in the production of ready-mixed concrete, if the portion corresponding to the aggregate is simply replaced by the crushed material, the large volume of coarse aggregate causes a large void volume between the coarse aggregates. However, it is difficult to densely fill the voids with the mortar component, and since the amount of fine aggregate is small, it is not possible to obtain a homogeneous mortar that does not cause material separation.

Therefore, when crushed material obtained by simply crushing concrete lumps with a crusher is kneaded as aggregate with water and cement to produce fresh concrete, the raw concrete is transported, charged, compacted, There is a problem in that workability related to concrete pouring such as leveling, that is, workability is impaired.

The present invention has been made in view of the above problems, and an object thereof is to crush a concrete block into a particle size distribution state suitable for use as an aggregate of ready-mixed concrete and have good workability. It is an object of the present invention to provide an apparatus for producing ready-mixed concrete capable of producing ready-mixed concrete.

[0007]

In order to achieve the above object, the apparatus for producing ready-mixed concrete of the present invention comprises, as described in claim 1, kneaded crushed concrete lumps, water and cement. An apparatus for producing ready-mixed concrete,
A first crushing unit for crushing the entire amount of the concrete mass, a crushed material distributing unit for distributing the primary crushed material crushed by the first crushing unit to the first pipeline side and the second pipeline side, and the second pipeline. A second crushing part for secondary crushing the distributed and dropped primary crushed product, and the primary crushed product discharged from the first pipeline and the secondary crushed product discharged from the second crushing part are received. In addition, it is characterized by comprising a mixed crushed product of these primary and secondary crushed products and a kneading section for kneading the above water and cement.

In the apparatus for producing ready-mixed concrete according to claim 1, the invention according to claim 2 is characterized in that in the crushed material distributing section, the first crushed material and the first pipeline side of the primary crushed material which are charged from the first crushing section side are connected to the crushed material distribution section. It is characterized in that a distribution adjusting means for adjusting a distribution ratio to the two pipelines is provided.

The invention according to claim 3 is the above-mentioned claim 1, 2
In the apparatus for producing fresh concrete according to, the particle size distribution of a mixed crushed product consisting of a primary crushed product and a secondary crushed product is detected and this particle size distribution is compared with a predetermined particle size distribution required for the fresh concrete, Based on this comparison, the distribution adjusting means is configured to adjust the distribution ratio of the primary crushed material distributed and input to the first conduit side and the second conduit side.

On the other hand, the invention according to claim 4 detects the workability state of the green concrete kneaded in the kneading section, and compares this workability state with a predetermined workability state required for the green concrete. Based on this comparison, the distribution adjusting means is configured to adjust the distribution ratio of the primary crushed material distributed and input to the first conduit side and the second conduit side.

[0011]

The amount of concrete lumps required to produce a predetermined amount of green concrete is prepared in advance and the total amount of the concrete lumps is put into the first crushing section. The concrete lump is primarily crushed by the first crushing section, and the primary crushed material is distributed to the first pipeline side and the second pipeline side by the crushed material distributing section disposed on the downstream side of the first crushing section, It is thrown in.

The primary crushed material distributed to the first pipeline side passes through the first pipeline as it is, while the primary crushed material distributed to the second pipeline side passes through the second pipeline while passing through the second pipeline. The secondary crushed material is discharged after being finely crushed by the crushing section, and the secondary crushed material is mixed with the primary crushed material passing through the first pipeline side and supplied to the kneading section. Then, in the kneading section, the amount of the mixed crushed material, that is, the cement and water, which have been weighed so as to have a mixing ratio according to the amount of the concrete lump, are kneaded into the mixed crushed material to obtain fresh concrete. Is manufactured.

In the production of this ready-mixed concrete, the primary crushed product obtained when the concrete lump is crushed by the first crushing section is a crushed product containing a large amount of large-sized particles corresponding to coarse aggregate. The secondary crushed material obtained by crushing by the second crushing section arranged in the two pipes is a crushed material having a large amount of small-diameter particles corresponding to fine aggregate.

The amount of aggregate used to produce ready-mixed concrete, that is, the amount of crushed concrete lumps, is determined by the amount of concrete lumps put into the first crushing section. , As described above, to produce fresh concrete by crushing into primary crushed material and secondary crushed material and kneading these mixed crushed material and cement and water at a predetermined mixing ratio, The particle size distribution of the aggregate changes depending on the mixing ratio of the primary crushed material and the secondary crushed material in the mixed crushed material.

Therefore, when the primary crushed material crushed by the first crushing section is distributed to the first pipeline side and the second pipeline side, a distribution adjusting means is arranged in the distribution section to provide the primary crushed material. The ratio of the amount of primary crushed material supplied to the first pipeline, which is discharged as it is, to the amount of primary crushed material supplied to the second pipeline equipped with the second crushing section that performs secondary crushing is adjusted. The mixed crushed product of the primary crushed product and the secondary crushed product is kneaded with cement and water to produce ready-mixed concrete exhibiting excellent workability.

The distribution adjusting means for determining the blending ratio of the mixed crushed material of the primary crushed material and the secondary crushed material detects the particle size distribution of the mixed crushed material and a predetermined value required for the fresh concrete. The flow distribution is compared and actuated based on this comparison, or the workability state of the fresh concrete kneaded in the kneading section, for example, the slump value is detected, and the predetermined value required for this slump value and the fresh concrete is detected. It is sufficient to compare the slump values of and to operate based on this comparison.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the entire apparatus configuration, and includes a first crushing unit 1 arranged on the uppermost side,
One main pipe 2 whose upper end opening faces below the first crushing unit 1, and a distribution unit 3 from the opening lower end of the main pipe 2.
First and second pipelines 4 and 5 branched downward through the second pipeline 5 and a second crushing section 6 provided in the middle of the second pipeline 5.
And a single crushed material discharge pipe 7 in which the lower end openings of the first and second pipelines 4 and 5 merge, and a crushed material dropping port 7a formed by the lower end openings of the crushed material discharge pipe 7. The crushed material temporary receiving hopper 8 facing the upper end opening, and the kneading section 9 arranged below the lower end discharge port 8a of the crushed material temporary receiving hopper 8.
It consists of and.

The structure of the ready-mixed concrete manufacturing apparatus will be described in more detail. The crushing mechanism of the first crushing unit 1 is shown in FIG.
The first crushing section 1 comprises one of a jaw crusher as shown in (a), a cone crusher as shown in (b) of FIG. 1 and a roll crusher as shown in (c) of FIG.
Is provided on the most upstream side of the concrete crushed material, and a hopper 1a for receiving a predetermined amount of concrete lumps is provided at the upper end of the crushed material and the lower end is used as the crushed material discharge port 1b.
The hopper-shaped enlarged upper end receiving port 2a of the main pipe 2 is faced to 1b. The main pipe 2 is a vertical pipe, and two inclined pipes 3a and 3b are branched from the lower end toward both sides, and the upper ends are connected to the lower end of the main pipe 2 by these inclined pipes 3a and 3b. Forming the distributing portion 3 which is also inclined pipes 3a, 3a
The first pipe line 4 and the second pipe line 5 which are vertical pipes at the downward inclined end
The upper ends of are connected and communicated.

Further, the primary crushed material A crushed by the first crushing section 1 is distributed to the first pipe line 4 and the second pipe line 5 at desired ratios at the upper branch points of the inclined pipes 3a, 3b. The distribution adjusting means 10 is provided. This distribution adjustment means 10
Is a crushed material distribution plate 10a whose lower end is rotatably pivoted toward a first conduit 4 side and a second conduit 5 side at a connecting portion at a branch point of the inclined tubes 3a and 3b, and the crushed material distribution plate 10a. It is composed of a distribution plate rotation adjusting mechanism (not shown) for adjusting the rotation degree of the plate 10a by an external operation, and the upper end portion of the crushed material distribution plate 10a is brought into the lower end opening of the main pipe 2. There is.

The first pipe line 4 directly passes from the inclined pipe 3a of the distributor 3 to the crushed substance discharge pipe 7 on the lower end side without any treatment of the primary crushed substance A, while the second pipe line 5 The middle portion in the length direction is cut off, and the second crushing portion 6 is cut into the cut portion.
Is interposed and arranged. The second crushing section 6 is provided with a primary crushed material receiving port 6a with the upper end facing the opening lower end of the upper pipeline section of the second pipeline 5, and the lower end is crushed by the second crushing section 6. It serves as a discharge port 6b for the next crushed material A1, and the upper end of the opening of the lower pipe line portion of the second pipe line 5 faces this discharge port 6b.

The second crushing section 6 is composed of a crusher mechanism such as a jaw crusher, a cone crusher, a roll crusher or the like like the first crushing section 1.
Any crushing mechanism can be adopted as long as it has a mechanism capable of finely crushing the primary crushed material A. Further, even if the same crusher as the first crushing unit 1 is used, the primary crushed material A put in the second crushing unit 6 can be crushed again, but it is not necessary to use it for the first crushing unit 1. It is desirable to use a crusher whose minimum blade width is set smaller than the minimum blade width of the crusher.

By using a crusher having a small minimum blade width, the primary crushed material A can be reliably crushed again, and the proportion of fine aggregate corresponding to the crushed secondary crushed material A1 can be reduced. By increasing the amount, the amount of primary crushed material A distributed and supplied to the side of the second crushing unit 6 is reduced, so that the amount of coarse aggregate in the mixed crushed material A2 thrown into the temporary receiving hopper 8 is reduced. It is possible to adjust the proportion of the fine aggregate to the predetermined proportion required for the ready-mixed concrete C.

The lower ends of the first conduit 4 and the second conduit 5 are connected to and communicate with the upper end of the single crushed material discharge pipe 7 by inclining in a direction in which they approach each other and then joining them. The crushing dropping port 7a of the crushed material discharge pipe 7 is exposed above the crushed material temporary receiving hopper 8. By thus joining the first pipe line 4 and the second pipe line 5 into the single crushed material discharge pipe 7, the opening area of the crushed material temporary receiving hopper 8 can be reduced and the crushed material can be reduced. While the primary crushed material A and the secondary crushed material A1 can be mixed appropriately while passing through the discharge pipe 7, the particle size distribution state of the crushed material described later can be easily and accurately measured. Without providing the discharge pipe 7 that joins the first pipeline 4 and the second pipeline 5, the opening lower ends of the first pipeline 4 and the second pipeline 5 are directly above the crushed material temporary receiving hopper 8. You may face it.

The apparent specific gravity of the mixed crushed material A2 is used as a means for detecting the particle size distribution state of the mixed crushed material A2, which is the primary crushed material A and the secondary crushed material A1 supplied and supplied into the crushed material temporary receiving hopper 8. In this case, a scale for measuring the volume (bulk) of the mixed crushed material A2 stored in the temporary receiving hopper 8 is attached to the inner peripheral wall surface of the temporary receiving hopper 8 in this case. Along with the temporary receiving hopper 8, the mixed crushed material A2
It suffices if a scale is attached to the device. It should be noted that the mixed crushed material A2 is obtained by crushing a fixed amount of the concrete lump A'which is put into the first crushing unit 1, and the weight of this concrete lump A'is measured in advance. You may stay.

Further, the apparent specific gravity (particle size distribution) of the mixed crushed material A2 detected by the detection means and the predetermined particle size distribution required for the ready-mixed concrete C to be produced, that is, in advance,
A comparison circuit section 11 for comparing with the desired particle size distribution prepared is provided, and the comparison circuit section 11 rotates the crushed material distribution plate 10a of the distribution adjusting means 10 to supply it to the first pipeline 4 side. The ratio of the amount of the substance A to the amount of the primary crushed substance A supplied to the second pipeline 5 side is adjusted so as to have a predetermined particle size distribution.

If the particle size distribution of the mixed crushed material A2 is not measured, the temporary receiving hopper 8 is not always necessary, and the mixed crushed material is fed from the lower end dropping port 7a of the crushed material discharge pipe 7 to the kneading section 9. A2 can be directly input and supplied.

The kneading section 9 is composed of a tank 9a and a stirring blade 9b provided in the tank 9a.
Above the tank 9a, in order to detect the workability state of the fresh concrete C obtained by mixing and stirring cement, water and an admixture with the above-mentioned mixed crushed material A2 put in the tank 9a at a predetermined ratio. An optical distance meter or a TV camera (not shown) that collimates the bottom of the tank is installed in the section. Further, a torque meter for detecting the rotation torque of the stirring blade 9b may be attached to the rotation center axis of the stirring blade 9b, and the workability state of the ready-mixed concrete C may be detected from the magnitude of the rotation torque.

Further, the workability state of the fresh concrete C detected by the detecting means and the predetermined workability state required for the fresh concrete C, that is, the workability state desirable as the fresh concrete prepared in advance are shown. An index (slump value, rotational torque value, degree of unevenness of the surface of green concrete, etc.) is compared by the above-mentioned comparison circuit unit 11, and this comparison circuit unit 11
The amount of primary crushed material A supplied to the first pipeline 4 side by rotating the crushed material distribution plate 10a of the distribution adjusting means 10 and the amount of primary crushed material A supplied to the second pipeline 5 side by It is configured to adjust the ratio of. This detection means may detect the particle size distribution of the mixed crushed material A2 of the primary crushed material A and the secondary crushed material A1 which are charged and supplied into the temporary receiving hopper 8 together with the detection. By doing so, it is possible to predict the workability state of the fresh concrete C to be obtained, and therefore it is sufficient to configure so that either one of them is detected.

In the kneading section 9, green concrete C
If it does not detect the workability state of, the light wave range finder, TV camera, torque meter, etc. are not required. Further, as a mechanism for stirring the crushed material A2 charged into the tank 9a of the kneading section 9, the cement, water, and the admixture, various types of stirring mechanisms including a mechanism for rotating the tank itself in addition to the stirring blades are used. Can be adopted.

The first embodiment of the method for producing ready-mixed concrete C by the thus-constructed ready-mixed concrete producing apparatus will be described with reference to the flow chart shown in FIG.
First, the steps before producing the ready-mixed concrete C
Mixing ratio of raw concrete C composition to be produced in S1,
That is, the mixing ratio of the cement, water, and the crushed concrete that make up the fresh concrete C is determined.
To determine the mixing ratio, determine the ratio of water and cement to satisfy the strength required for concrete, that is, determine the mixing ratio of water and cement from the unit cement amount, and use the rest as the mixing amount of crushed material. Done in.

Next, in step S2, the volume of the concrete crushed product for one batch to be blended is obtained from the above-determined mixture ratio and the amount of concrete for one batch which is the production amount of the fresh concrete C for one batch. In S3, the concrete block A'corresponding to the volume is taken out from the stockyard. When taking out the concrete lump A ′ from the stockyard, a large lump that is difficult to crush in the first crushing unit 1 is divided into small pieces in advance so that it can be put into the first crushing unit 1.

In step S4, a predetermined amount of concrete lump A'required for producing a batch of green concrete C taken out from the stockyard is put into the hopper 1a of the first crushing section 1 and the first crushing section 1 Primary crushing by the crusher (step S5). This primary crushed material A is the first crushing unit 1
The crushed material distribution plate 10 of the distribution adjusting means 10 which is dropped in the main pipe 2 in step S6 from the crushing discharge port 1b of
It is distributed to the one inclined pipe 3a and the other inclined pipe 3b of the distributor 3 branched from the lower end of the main pipe 2 by a predetermined ratio.

The primary crushed material A distributed to one of the inclined pipes 3a falls into the first pipe line 4 communicating with the inclined pipe 3a and is not treated at all and the first pipe line 4 is not processed. It passes through the inside (step S7) and is received in the crushed material temporary receiving hopper 8 (step S10). The primary crushed material A distributed to the other inclined pipe 3b side is the second pipe line 5 communicating with this inclined pipe 3b.
It is dropped inside and is thrown into the primary crushed material receiving port 6a of the second crushing section 6 in step S8, and is crushed again by the crusher of the second crushing section 6 so that the secondary crushed material has a smaller particle size than the primary crushed material A. It becomes crushed material A1.

The secondary crushed material A1 passes through the lower end discharge port 6b of the second crushing section 6 and the lower part of the second conduit 5 to the first conduit 4 described above.
The primary crushed material A discharged from the crushed material is received in the crushed material temporary receiving hopper 8 (step S10). The minimum blade width of the crusher of the second crushing unit 6 is the first crushing unit 1
Even if the crusher has the same minimum blade width as the primary crushed product A
Since it can be crushed again, it is preferable that the minimum blade width is smaller than the crusher of the first crushing section 1.

The receiving of the primary crushed material A from the side of the first pipeline 4 into the temporary receiving hopper 8 and the reception of the primary crushed material A from the side of the second pipeline 5 are first carried out in the first crushing section 1. This is continuously performed until the crushing of the entire amount of the injected concrete lump is completed, and when the crushed material corresponding to the total amount of this concrete lump is received in the temporary receiving hopper 8, the primary receiving inside the temporary receiving hopper 8 is performed in step S11. The particle size distribution state of the mixed crushed material A2 of the crushed material A and the secondary crushed material A1 is detected.

As a method of detecting the particle size distribution state, other than the method of directly detecting the particle size distribution by screening,
A method of indirectly detecting the crushed material by measuring the apparent specific gravity (weight per unit volume) can be used.
In the detection method based on apparent specific gravity, if the particle size is evenly distributed from small-sized crushed materials to large-sized crushed materials, particles smaller than the particle size will enter the gaps between the particles. The apparent specific gravity increases, and it can be determined that the larger the specific gravity is, the larger the amount of fine aggregate is. In order to measure the apparent specific gravity, it is necessary to provide a scale for measuring the volume in the temporary receiving hopper 8 as described above and to measure the load of the temporary receiving hopper 8 with a load cell or the like. Good.

On the other hand, the ideal data for obtaining the ready-mixed concrete C having good workability by previously measuring the particle size distribution and apparent specific gravity of the aggregate used in the ordinary concrete, that is, the concrete having the optimum properties Data is created, this data is written in the comparison circuit unit 11, and the data of the particle size distribution state detected in step S12 is compared with the ideal data (normal value), and the comparison result, If the detected particle size distribution state is within the allowable range of this ideal data, the entire amount of the mixed crushed material A2 in the temporary receiving hopper 8 is put into the tank 9a of the kneading unit 9 and mixed in this tank 9a. Along with the crushed material A2, other materials necessary for constructing the fresh concrete C obtained from the amount of one batch of cement, that is, cement, water, and an admixture are mixed with the crushed material A2 in a predetermined amount. Input with the mixing ratio (step S13, step S14).

When all the raw concrete constituent materials have been put into the tank 9a of the kneading section 9 in this way, the stirring blade 9b is operated to knead these raw concrete constituent materials for a predetermined time at a predetermined speed to prepare the raw concrete C. The manufacturing is completed.

Further, as a result of the comparison by the comparison circuit 11,
If the data of the particle size distribution state of the mixed crushed material A2 is outside the allowable range of the ideal data, for example, when the amount of fine aggregate is small, the above-mentioned mixing of one batch put in the temporary receiving hopper 8 is performed. While the crushed material A2 is discarded, the crushed material distribution plate 10a of the distribution adjusting means 10 is rotated in the direction in which the difference is eliminated according to the size of the difference between the ideal data and the detected data. That is, when the amount of fine aggregate is small as described above, the crushed material distribution plate 10a is rotated toward the first pipeline 4 side and the opening degree of the main pipe 1 communicating with the second pipeline 5 side is increased. By increasing the ratio, the amount of the primary crushed material A crushed in the second crushing section 6 is increased and the amount of the fine crushed material equivalent to the mixed crushed material A2 fed into the temporary receiving hopper 8 is increased. is there.

When the ratio of the primary crushed material A distributed to the first pipeline 4 side and the second pipeline 5 side is changed, the amount of the primary crushed material A processed in the second crushing section 6 changes. Therefore, the crusher of the second crushing unit 6 is adjusted so that the crushing speed corresponds to the change. Thus, the first pipeline 4 side and the second pipeline 5 side
After the adjustment of the distribution ratio of the primary crushed material A to the side and the operation speed of the second crushing unit 6 are finished, the hopper 1a of the first crushing unit 1 is again provided.
A predetermined amount of concrete lump A'is put into the crushed mixture, and the mixed crushed material A2 crushed and stored in the temporary receiving hopper 8 is subjected to the above steps S6 to S until the particle size distribution state within the theoretical ideal data allowable range. Repeat step S12.

Next, in the above embodiment, the property of the fresh concrete C is determined by detecting the particle size distribution, but it may be detected by the fluidity of the fresh concrete C instead of by the particle size distribution. In this case, the primary crushed material A and the secondary crushed material A1 can be directly charged into the tank 9a of the kneading section 9 without using the temporary receiving hopper 8 in the overall configuration of the apparatus shown in FIG. Good.

A method for producing ready-mixed concrete C in this case will be described as a second embodiment with reference to the flow chart shown in FIG. First, as in the first embodiment, the mixing ratio of the composition of the raw concrete C to be produced prior to producing the raw concrete C, that is, the cement and water forming the raw concrete C, and the crushed concrete The blending ratio of and is determined (step S1). To determine the mixing ratio, determine the ratio of water and cement to satisfy the strength required for concrete, that is, determine the mixing ratio of water and cement from the unit cement amount, and use the rest as the mixing amount of crushed material. Done in.

Next, in step S2, the volume of one crushed concrete crushed product to be blended is obtained from the above-determined mixing ratio and the amount of concrete for one batch which is the production amount of fresh concrete C for one time. In S3, the concrete block A'corresponding to the volume is taken out from the stockyard. When taking out the concrete lump A ′ from the stockyard, a large lump that is difficult to crush in the large first crushing section 1 is divided into small pieces in advance so that it can be put into the first crushing section 1.

In step S4, a predetermined amount of concrete lump A'required for producing one batch of fresh concrete C taken out from the stockyard is put into the hopper 1a of the first crushing section 1 and the first crushing section 1 Primary crushing by the crusher (step S5). This primary crushed material A is the first crushing unit 1
The crushed material distribution plate 10 of the distribution adjusting means 10 which is dropped in the main pipe 2 in step S6 from the crushing discharge port 1b of
It is distributed to the one inclined pipe 3a and the other inclined pipe 3b of the distributor 3 branched from the lower end of the main pipe 2 by a predetermined ratio.

The primary crushed material A distributed to one of the inclined pipes 3a falls into the first pipe line 4 communicating with the inclined pipe 3a and is not processed in the first pipe line 4 at all. (Step S7) and is received from the lower end of the first conduit 4 into the tank 9a of the kneading section 9 (Step S10). The other inclined tube
The primary crushed material A distributed to the 3b side falls into the second pipe line 5 and is introduced into the primary crushed material receiving port 6a of the second crushing section 6 (step S8). Is crushed again into a secondary crushed material A1 having a smaller particle size than the primary crushed material A. Is accepted within (step S10).

The receiving of the primary crushed material A from the side of the first pipeline 4 and the reception of the primary crushed material A from the side of the second pipeline 5 into the tank 9a are first introduced into the first crushing section 1. It is continuously carried out until the crushing of the total amount of concrete lumps is completed, and when the crushed material corresponding to the total amount of this concrete lumps is received in the tank 9a, it is necessary to form ready-mixed concrete C obtained from the amount of one batch of concrete. Other materials such as cement, water, and admixture are added to the crushed material in a predetermined mixing ratio (step S11).

When all the raw concrete constituent materials are put into the tank 9a of the kneading section 9 in this way, the stirring blade 9b is operated to knead these raw concrete constituent materials for a predetermined time at a predetermined speed to form the raw concrete C. Manufacturing (step S12).

During the production of the fresh concrete C, that is, during the kneading of the raw concrete constituent materials, or when the kneading is completed, the workability state of the fresh concrete C is detected in step S13. As a method of detecting the state of this workability, a method by a slump test, a method of measuring the rotation torque of the stirring blade 9b of the kneading section 9, a tank
There is a method of detecting the surface irregularity of green concrete C being mixed in 9a.

The method of detecting the workability state by the slump test is determined by the magnitude of the drop (slump value) from the top surface of the fresh concrete C immediately after the fresh concrete C is sampled by the slump cone and the slump cone is pulled up. If the drop is large, the liquidity is high, and if it is small, the liquidity is low. For the size of this drop, an optimum value is selected depending on the structure of the object to be placed in the ready-mixed concrete, the purpose of placing, etc. However, if the fall measured from the top is extremely large, the aggregate and other concrete constituent materials have separated, so the fluidity is low and it is judged to be unsuitable ready-to-use concrete. It

The method of detecting the workability state by the rotation torque when stirring the fresh concrete is that the better the workability state is, the smaller the rotation torque of the rotary blade 9b is. Therefore, the relationship between the slump value and the rotation torque is obtained in advance. The state of workability is judged from this relationship. Further, the detection of the unevenness of the surface of the green concrete C is performed by the optical distance meter or the image processing as described above, and it is determined that the flatter the surface, the better the fluidity and the better the workability.

Further, the slump value of the fresh concrete having good workability, the rotation torque of the stirring blade when the fresh concrete was prepared, and the unevenness of the fresh concrete were prepared as ideal data, and this data was prepared. It is written in the comparison circuit unit 11 in step S1.
The value representing the workability state of the fresh concrete C detected in 4 is compared with the above ideal data (normal value), and as a result of the comparison, the value representing the detected workability state is the permissible value of this ideal data. If within range,
Use as it is as ready-mixed concrete C (Step S1
Five).

On the other hand, as a result of the comparison by the comparison circuit 11,
If the value representing the workability state of the mixed crushed material A2 is outside the permissible range of the ideal data, the raw concrete C in the tank 9a is discarded, and the crushed material cup plate 10 of the distribution adjusting means 10 is discarded.
By rotating a, the distribution ratio of the primary crushed material A from the first crushing section 1 to the first pipeline 4 side and the second pipeline 5 side is changed so as to approach the allowable range of ideal data ( Step S6). When the ratio of the primary crushed material A distributed to the first pipeline 4 side and the second pipeline 5 side is changed, the amount of the primary crushed material A processed in the second crushing unit 6 changes, so that The crusher of the second crushing unit 6 is adjusted so that the crushing speed corresponds to the change.

When the adjustment of the distribution ratio of the primary crushed material A to the first pipe 4 side and the second pipe 5 side and the operation speed of the second crushing unit 6 are completed in this way, the first crushing unit 1 is again operated. A predetermined amount of one batch of concrete lump A'is put into the hopper 1a, crushed, and then put into the tank 9a of the kneading section 9 and cement, water, and an admixture in the tank 9a have a predetermined mixing ratio. The above steps S6 to S14 are carried out until the value representing the workability state of the green concrete C obtained by kneading is supplied within the allowable range of ideal data.
The above process is repeated.

5 and 6 show a modified example of the distribution adjusting means 10 in the distribution section 3, and in FIG.
Of the inclined pipes 3a, 3b branched from the lower end of the inclined pipe 3a, which communicates with the second pipe line 5 side, toward the lower circumferential length direction of the inclined pipe 3a, which communicates with the first pipe line 4 side. A crushed material distribution plate 10b that advances and retreats is provided. By retracting the crushed material distribution plate 10b, the opening degree of the inclined pipe 3b communicating with the second pipeline 5 side increases and the second crushing portion 6 The amount of primary crushed material A to be subjected to secondary crushing is increased by, and the opening degree is reduced by advancing to reduce the amount of primary crushed material A to be subjected to secondary crushing. The entire amount of the object A is configured to be supplied only to the first pipeline 4 side.

The distribution adjusting means 10 shown in FIG. 6 eliminates the one inclined pipe 3a and connects the main pipe 2 and the first pipe line 4 into one vertical pipe, and at the lower end of the main pipe 2. The inclined pipe 3b communicating with the second pipe line 5 on the side of the second crushing unit 6 is branched from the outer side toward the outside, and the first pipe line 4 is continuous with the lower peripheral portion of the inclined pipe 3b. The inclined distribution plate 10c is disposed so as to be movable back and forth in the extension direction of the lower peripheral portion of the inclined pipe 3b from the upper end of the inclined pipe 3b. It is configured to adjust the size.

The inclined distribution plate 10c is composed of a mesh-shaped sieve plate, and when the primary crushed material A falls on the distribution plate 10c through the main pipe 2, it passes through the sieves contained in the primary crushed material A. The small-diameter crushed material that has been used for sieving is sifted into the first pipeline 4, and the primary crushed material A that falls in the first pipeline 4 as it is through the upper end opening of the first pipeline 4 that is not blocked by the distribution plate 10c While being supplied to the receiving hopper 8 or the kneading section 9, the large-sized primary crushed material A which cannot pass through the distribution plate 10c is sent to the second pipe line 5 side along the inclined surface of the distribution plate 10c, Secondary crushing is performed by the second crushing unit 6.

In this way, the primary crushed material A distributed to the first pipe line 4 side is as it is to the temporary receiving hopper 8 side or the kneading section 9
Distributing part or all of it instead of dropping it to the side
It is sieved by 10c, and the remaining primary crushed material A is distributed to the second pipe line 5 side for secondary crushing. Therefore, large-diameter particles with a large mixing ratio compared to the ideal particle size distribution of aggregates can be obtained. The crushed material A2 can be divided into small pieces and can be used as the equivalent of fine aggregate, which is efficient.
Can be manufactured, and the size of the second crushing unit 6 can be reduced.

[0058]

As described above, the apparatus for producing ready-mixed concrete according to the present invention is, as described in claim 1, a first crushing apparatus for crushing the entire amount of concrete lumps necessary for producing one batch of fresh concrete. Section, a crushed material distribution unit that distributes the primary crushed material crushed by the first crushing section to the first pipeline side and the second pipeline side, and the primary crushed material that is distributed and dropped to the second pipeline. The second crushing unit for secondary crushing, the primary crushed product discharged from the first pipeline, and the secondary crushed product discharged from the second crushing unit are received, and the primary and secondary crushing of these are performed. Since it is composed of a mixed crushed material and a kneading section for kneading the water and cement, the total amount of the primary crushed material and the secondary crushed material of the concrete mass, in using as an aggregate equivalent of green concrete, Use crushed concrete as aggregate Good fresh concrete of workability can be efficiently produced without having the same blending ratio as the conventional fresh concrete and specially adding another material which does not.

Further, according to the second aspect of the present invention, in the crushed material distributing section, the distribution ratio of the primary crushed material to be introduced from the first crushing section side to the first pipeline side and the second pipeline side is set. Since the distribution adjusting means for adjusting is provided, by operating the distribution adjusting means, the supply amount of the primary crushed material to the first pipeline side that allows the primary crushed material to pass through as it is, and the second crushing section for performing the secondary crushing. It is possible to easily and accurately adjust the ratio with the amount of primary crushed material supplied into the second pipeline equipped with, so that the particle size distribution of concrete crushed material can be easily adjusted to the required particle size distribution state. It is possible to produce ready-mixed concrete that can be adjusted and can easily correspond to the mixing ratio of the constituent material of the ready-mixed concrete and the required workability and exhibit excellent workability.

According to the third aspect of the invention, the particle size distribution of the mixed crushed product consisting of the primary crushed product and the secondary crushed product of the concrete mass is detected, and this particle size distribution and fresh concrete are required. Since it is configured to compare with a predetermined particle size distribution, and based on this comparison, the distribution adjusting means is configured to adjust the distribution ratio of the primary crushed material distributed and input to the first pipeline side and the second pipeline side. , If the particle size distribution of the crushed concrete crushed material is not in the prescribed particle size distribution state, adjust the concrete mass to be crushed next so that the particle size distribution is in the prescribed distribution state based on it. It can be crushed and a concrete block obtained by dismantling a concrete structure or the like can be effectively used as an aggregate of ready-mixed concrete.

Similarly, in the invention according to claim 4,
Detecting the workability state of the fresh concrete mixed in the kneading section, comparing this workability state with the predetermined workability state required for the fresh concrete, and based on this comparison, the distribution adjustment means makes the first pipeline side Since it is configured to adjust the distribution ratio of the primary crushed material that is distributed and input to the second pipeline side and the second pipeline side, concrete crushed material is used as an aggregate and a workability equivalent to that of normal fresh concrete is obtained. Concrete can be manufactured efficiently.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional front view of the entire apparatus,

FIG. 2 is a simplified front view of a crusher used as a crushing mechanism,

FIG. 3 is a flow chart showing a manufacturing process of ready-mixed concrete,

FIG. 4 is a flowchart showing another production process of ready-mixed concrete,

FIG. 5 is a simplified vertical sectional front view showing another embodiment of the distribution adjusting means;

FIG. 6 is a simplified vertical sectional front view showing still another embodiment of the distribution adjusting means.

FIG. 7 is a diagram showing the standard particle size of aggregate and the particle size of crushed concrete.

[Explanation of symbols]

1 first crushing section 2 mains 3 distributors 4 first pipeline 5 Second pipeline 6 Second crushing section 8 Crushed material temporary receiving hopper 9 Kneading department 10 Distribution adjustment means A primary crushed material A1 Secondary crushed material A2 mixed crushed material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sumio Okawa             2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi             Inside the Okumura group F-term (reference) 4D067 DD02 GA06 GB05 GB07                 4G056 AA08 AA25 CB13 DA01 DA05

Claims (4)

[Claims] 1. An apparatus for producing ready-mixed concrete, which comprises kneading a crushed concrete lump, water and cement.
A first crushing unit for crushing the entire amount of the concrete mass, a crushed material distributing unit for distributing the primary crushed material crushed by the first crushing unit to the first pipeline side and the second pipeline side, and the second pipeline. A second crushing part for secondary crushing the distributed and dropped primary crushed product, and the primary crushed product discharged from the first pipeline and the secondary crushed product discharged from the second crushing part are received. An apparatus for producing ready-mixed concrete, comprising a crushed material obtained by mixing these primary and secondary crushed materials and a kneading section for kneading the water and cement. 2. The crushed material distributing section is provided with a distribution adjusting means for adjusting the distribution ratio of the primary crushed material that is input from the first crushing section side to the first pipeline side and the second pipeline side. The apparatus for producing ready-mixed concrete according to claim 1, wherein. 3. A particle size distribution of a mixed crushed product composed of a primary crushed product and a secondary crushed product is detected, and this particle size distribution is compared with a predetermined particle size distribution required for green concrete, and based on this comparison. 3. The distribution adjusting means is configured to adjust the distribution ratio of the primary crushed material distributed and input into the first pipeline side and the second pipeline side. Raw concrete manufacturing equipment. 4. The workability state of the green concrete mixed in the kneading section is detected, the workability state is compared with a predetermined workability state required for the green concrete, and the distribution adjusting means is based on this comparison. 3. The composition of the ready-mixed concrete according to claim 1 or 2, wherein the distribution ratio of the primary crushed material to be distributed and put into the first pipeline side and the second pipeline side is adjusted by Manufacturing equipment.