JP2001071320A - Method and device for continuously producing concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for continuously producing concrete, in which concrete having high quality can be produced continuously for a short time by continuously supplying e.g. necessary material and kneading it. SOLUTION: In a screw mixer 11, a screw provided with paddles 14 for kneading is equipped in the inside of a casing. A long opening is formed in the upper part of the casing from one end side to the other end side and a discharge port is formed in the other end side. Material for forming mortar is charged from a plurality of charging parts 15-17 and mortar is firstly kneaded. Then, crude aggregate is charged through the other charging part 18 near to the discharge port side from these charging parts and made to concrete. Furthermore, this concrete is charged into kneading box devices 20 and passed through a plurality of deformed parts, in which the shape of a section is continuously changed from the inlet part thereof toward the outlet part, and also passed through a converging dividing means provided between an inlet part and an outlet part and kneaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for continuously producing concrete, and more particularly to a method and an apparatus for continuously producing concrete which can be continuously produced at a concrete placing site.

[0002]

2. Description of the Related Art Conventionally, a batcher plant, which is an apparatus for producing concrete, measures cement, water, sand, gravel, an admixture, etc., which are the raw materials of concrete, into a predetermined composition, kneads the mixture, and does not solidify. Equipment for producing concrete in a state, including dam construction, civil engineering construction,
It is widely used in ready-mixed concrete factories and secondary concrete product factories.

A conventional batcher plant is roughly divided into a material storage section, a measuring section, a kneading section, and a loading section.
These arrangements divide into various types, and the most common type is a tower type. Conventional tower batcher plant
From the top, receiving room, material storage tank (cement storage tank, sand storage tank, gravel storage tank, water storage tank), measuring unit (cement measuring tank, sand measuring tank, gravel measuring tank), rotary concrete mixer, concrete hopper And the like were sequentially superimposed in a tower shape, and a general type was a type in which an operation room was extended from a measuring or mixer room, and a type in which the operation room was separated from a plant.

As described above, most of the conventional batcher plants, including those of the tower type, are of a batch processing type (a process in which each material is mixed and stirred at a predetermined amount and repeated many times). Met. What mixes and agitates each material at a time is called a batch mixer.

[0005]

However, such batch processing has resulted in intermittent production of concrete and has been not very efficient for continuously producing a large amount of concrete. Therefore, in a conventional tower-type batcher plant, it has been attempted to arrange two rotary concrete mixers in a mixer chamber and use them alternately to ensure continuity, that is, continuity of concrete production as much as possible.

In batch processing, if a plurality of rotary concrete mixers are installed and used sequentially as described above, a certain degree of continuous production can be secured, but the number of rotary concrete mixers installed can be increased. There was a problem that the equipment of the entire batcher plant would become larger accordingly. For this reason, in order to continuously produce concrete, equipment using a mixer has been partially developed and used, but the quality of concrete obtained by that equipment is never satisfactory. It was not something.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem. For example, necessary materials are continuously supplied and kneaded so that high-quality concrete can be continuously and in a short time. An object of the present invention is to provide a method and apparatus for continuously producing concrete that can be produced.

[0008]

SUMMARY OF THE INVENTION The present invention is a method for continuously producing concrete, and is constituted as follows in order to solve the above-mentioned technical problems. That is, the method for continuously producing concrete of the present invention comprises mixing a mortar from one end of a screw mixer having a plurality of paddles for kneading arranged inside a casing, mixing the mortar, and then mixing the mortar. The coarse aggregate is put into the mortar in the casing from another position closer to the other end side than the position on the one end side where the forming material is put and mixed as concrete, and then formed on the other end side of the screw mixer. The kneaded concrete is discharged from the discharged outlet, and the concrete is put into a kneading box device of a continuous input type to perform main kneading.

Further, the present invention is an apparatus for continuously producing concrete, and is configured as follows in order to solve the above-mentioned technical problems. That is, the continuous concrete production apparatus of the present invention is a screw mixer having a long opening from one end side to the other end side and a discharge port at the other end side in an upper part of a casing provided with a screw having a plurality of paddles for mixing. And a mortar forming material inputting section for inputting the mortar forming material to the screw mixer and a coarse aggregate inputting section for inputting coarse aggregate into the mortar in the casing from another position closer to the discharge port side from the inputting section, and a screw. A kneading box device for further kneading the concrete kneaded by the mixer.The kneading box device has an inlet at one end and an outlet at the other end, and the cross-sectional shape is continuous from the inlet to the outlet. And a plurality of deformed passages that change in shape and extend in the axial direction, and are provided between an inlet portion and an outlet portion of each deformed passage, and merge each material passing through each deformed passage. And a merging dividing means for dividing the concrete exiting the outlet of the screw mixer and continuously charged from the inlet portion, characterized by kneading by passing each deformed passages toward the outlet portion.

<Specific Configuration in the Present Invention> The method and apparatus for continuous production of concrete according to the present invention comprise the above-mentioned essential components, but are established even when the components are specifically as follows. . The specific components are
The screw mixer is characterized in that the screw mixer is installed so as to be inclined upward in the traveling direction of the concrete as the kneaded material.
In this case, the screw mixer is preferably installed so as to be inclined upward in the feeding direction.

According to the method and apparatus for continuously producing concrete of the present invention having such features, a mortar material such as cement, fine aggregate and water is appropriately supplied to a screw mixer. That is, a mortar-forming material (including an admixture) such as cement, fine aggregate, and water is charged into one end of a casing constituting a screw mixer, and the mortar is fed while being kneaded.

Next, the coarse aggregate is charged into the mortar in the casing from another position closer to the discharge port side from the position on one end side where the mortar forming material has been charged, and kneaded as concrete, and then the other end side of the screw mixer The kneaded concrete is discharged from the discharge port formed in the step (a), and the concrete is put into a continuous charging type kneading box device in the next step.

[0013] As described above, the mortar is first kneaded and mixed by the screw mixer, and then the coarse aggregate is put into the concrete from another position near the discharge port side. Further kneading is required to make concrete. Then, the concrete roughly kneaded by the screw mixer is supplied to a kneading box device which is a main kneading device.

As means for feeding the concrete roughly kneaded by the screw mixer to the kneading box device, a discharge port of the screw mixer and an inlet end of the kneading box device are connected by a pipe, and the concrete is fed by the pumping force of the screw mixer. To the kneading box, or a means for transferring the coarsely kneaded concrete from the screw mixer to a belt conveyor and feeding the conveyed material to the kneading box device by this conveyor.

The concrete in the coarsely-mixed state sent to the kneading box device as described above enters the internal deformed passage from the upper entrance end. Since the cross-sectional shape of each deformed passage is continuously changed in the longitudinal direction, the concrete passing through the deformed passage is given a compressive deformation action and a shear deformation action, and is completely kneaded. You.

Moreover, while the concrete passes through the deformed passages, the concrete passing through the deformed passages merges by passing through the split flow means, and is again divided (divided) into the deformed passages and passed. Is kneaded better by repeating this. In such a kneading box device, in general, by connecting a plurality of elements in the vertical direction so as to be stacked, this partial flow action can be necessarily obtained.

The elements are respectively an inlet end and
An outlet end, and a plurality of deformed passages extending from the inlet end to the outlet end, an arrangement pattern of an inlet portion of each deformed passage formed at the inlet end and an arrangement of an outlet portion of each deformed passage formed at the outlet end. It is different from the pattern. If such elements are brought into close contact with each other at the outlet end and the inlet end of the adjacent element, the connection between the inlet and outlet of each deformed passage in each element serves as a junction dividing means.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for continuously producing concrete according to the present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 shows a continuous concrete production apparatus 10 according to one embodiment of the present invention. The continuous concrete manufacturing apparatus 10 of this embodiment includes a screw mixer 11 and at least a material such as cement, fine aggregate (sand), and coarse aggregate (gravel, crushed stone, etc.) near the screw mixer 11. The screw mixer 11
Each storage tank (only one storage tank 12 is shown in FIG. 1) is provided to supply the storage tanks.

As shown in FIGS. 2 and 3, the screw mixer 11 includes a casing 11a having an open top like a gutter and a screw 11b rotatably installed inside the casing 11a. The screw shaft 11c provided at the center protrudes from the casing 11a on the terminal side (the right end in FIG. 2) and is connected to the drive rotation shaft of the drive electric motor 13 via a sprocket or the like. Paddle 1 in the screw groove of screw 11b
4 are arranged.

The paddle 14 is a screw shaft 11c.
Is a plate-like member having one end fixed to and extending outward in the radial direction, and serves to mainly stir and knead the mortar and concrete as the kneaded material in the casing 11a. Such paddles 14 are attached to the screw shaft 11c at substantially equal intervals in the longitudinal direction of the screw 11b.

At the lower end of the casing 11a at the end of the screw mixer 11, an outlet 1 for discharging the kneaded material is provided.
1d is provided, and the casing 11a is
The concrete sent inside goes out from the outlet 11d. Casing 11a of screw mixer 11
As shown in FIGS. 1 and 2, four material feeding sections are provided from the feed end, that is, the starting end, in the feed direction.

The material input section provided at the position closest to the start end is a fine aggregate input section 15 for inputting fine aggregate such as sand. The material input section provided adjacent to the fine aggregate input section 15 is a water supply section 16. Further, a material input section provided adjacent to the water supply section 16 is a cement input section 17. A coarse aggregate input section 18 is provided at a position slightly away from the cement input section 17 in the feeding direction.

Each of the material input sections 15 to 18 is connected to each of the above-mentioned material storage tanks via a communication pipe for supply or the like via a measuring means (not shown). However, the water supplied from the water supply unit 16 into the screw mixer 11 can be supplied in a constant amount from a water storage tank (not shown) installed at an appropriate position near the screw mixer 11 using a water supply pump or the like. .

Such a screw mixer 11 is installed so as to be inclined upward in the traveling direction of the concrete as the kneaded material, and the inclination angle is preferably 10 to 15 degrees. On the end side of the screw mixer 11, a continuous kneading type box device 20 is connected at its inlet to the screw mixer 1
It is arranged in the vertical direction so as to be aligned with the one discharge port 11d, and is supported by the gantry 19 or the like.

The continuous kneading box device 20 is a device for further kneading the concrete kneaded by the screw mixer 11, and this box device 20 is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-28644. Since it is already well known, its structure will be briefly described.

The kneading box device 20 has a plurality of inlet sections formed at one end and an outlet section at the other end, the sectional shape of which continuously changes from the inlet section to the outlet section, and which extends in the axial direction. A deforming passage, provided between the inlet and outlet of each deforming passage, and merging dividing means for merging and dividing each material passing through each deforming passage, and continuously feeding each material from the inlet The kneading is performed by passing each deformed passage toward the outlet.

Next, the operation of the continuous concrete manufacturing apparatus 10 according to this embodiment will be described. Fine aggregate such as sand is continuously supplied from a fine aggregate input portion 15 located at the most end side of the screw mixer 11, and the fine aggregate is supplied from the upper open portion of the casing 11a to the casing 11a.
a and fed while being stirred by the screw 11b. The fine aggregate fed in the casing in this manner includes the water supply unit 1 adjacent to the fine aggregate input unit 15.
Water is continuously supplied at a constant rate from 6 and is finely mixed with fine aggregate by the screw 11b.

Thereafter, water uniformly adheres to the peripheral surface, and cement is continuously and quantitatively supplied from the cement input section 17 to the fine aggregate being fed in the feeding direction in the casing 11a, and is stirred by the screw 11b. It is sent further while being done. When the cement is put into the casing 11a, the fine aggregate has already sufficiently adhered to the surrounding surface of the fine aggregate as described above, so that the cement put into the casing 11a does not roll up the powder and is fine. The mortar adheres well to the aggregates, while the mortar
It is further fed in the feed direction at b.

The mortar in the casing 11a is mixed in the paddle 14 attached to the screw shaft 11c while being sent in the feeding direction. After the mixing and feeding of the mortar by the paddle screw 11b has been continued for a while, coarse aggregate such as gravel is quantitatively supplied from the charging portion 18 to the mortar in the casing 11a, whereby the mortar becomes concrete.

At this time, since the screw mixer 11 is installed so as to be inclined upward in the feeding direction, the mortar or concrete in the casing 11a always exerts an action force to return to the starting end, so that the screw groove is formed. The paddle 14 and the screw itself agitate the mixture, so that the effect of kneading is more exhibited. However, if the inclination angle of the screw mixer 11 is too large,
Since the supplied water flows backward to the starting end, the inclination angle is desirably about 10 to 15 degrees as described above.

The concrete is continuously screwed 11
b while being fed toward the terminal end of the screw mixer 11,
Is discharged from a discharge port 11d formed at the end side of the kneading machine, and is fed into a continuous charging type kneading box device 20 which is the next step.

The reason that the concrete kneaded and mixed by the screw mixer 11 is further fed into the continuous charging type kneading box device 20 and kneaded is that only the kneading and mixing in the screw mixer 11 results in a so-called coarse kneading state and complete concrete mixing. In order to achieve this, it is necessary to further knead the mixture. Therefore, the concrete roughly kneaded by the screw mixer 11 is supplied to the kneading box device 20, which is the main kneading device, and kneaded.

In the continuous concrete production apparatus of this embodiment, the mortar is first kneaded and mixed by the screw mixer 11, and then coarse aggregate is put into the concrete from another position close to the terminal end, and then the concrete is formed. The kneaded concrete is directly charged into the kneading box device to perform the main kneading. In the present invention, however, the concrete is directly kneaded from the outlet 11d of the screw mixer 11 to the kneading box device 2.
The method is not limited to the case of charging at the entrance of 0.

For example, the outlet 1 of the screw mixer 11
1d and the inlet of the kneading box device 20 may be connected by a pipe (not shown), and concrete may be sent to the kneading box device 20 by the pumping force of the screw mixer 11, or coarse mixing may be performed from the screw mixer 11. The transferred concrete is transferred to a belt conveyor (not shown),
The conveyor may feed the kneading box device 20.

The concrete in the coarsely-mixed state sent to the kneading box device 20 as described above enters the internal deformed passage from the upper entrance. Since each deformation passage has a continuously changing cross-sectional shape in the longitudinal direction, concrete passing through the deformation passage is given a compressive deformation action and a shear deformation action, and furthermore, the concrete is The constituent materials are completely kneaded by colliding with each other in the deformed passage or colliding with the inner wall surface of the kneading box device.

Moreover, while the concrete passes through the deformed passages, the concrete passing through the deformed passages merges by passing through the split flow means, and is again divided (divided) into the deformed passages and passed. Is kneaded better by repeating this. In such a kneading box device 20, generally, by connecting a plurality of elements 21 in the vertical direction so as to be stacked, the partial flow action can be necessarily obtained.

As shown in FIG. 4, the element 21 includes an inlet end 22, an outlet end 23, and a plurality of deformed passages 24a extending from the inlet end 22 to the outlet end 23.
24b, each deformation passage 2 formed at the inlet end 22.
4a, 24b, the arrangement pattern of the inlet portions 22a, 22b and the outlet portions 23a, 2b of the respective deformed passages formed at the outlet end 23.
3b is different from the arrangement pattern of FIG.

When such elements 21 are closely connected at the outlet end 23 and the inlet end 22 of the adjacent element 21, the inlets 22 a, 22 b of the deformed passages 24 a, 24 b of each element 21 and the outlet Part 23
The connection portions with a and 23b serve as merging and dividing means.

FIG. 5 shows a continuous concrete production apparatus 30 according to another embodiment of the present invention. FIG.
FIG. 2 is a plan view of a vehicle, for example, a trailer 31 or the like, as viewed from above, and shows a continuous concrete production device 30 of this embodiment.
Is designed to be miniaturized so that it can be carried on the loading section of such a trailer 31. The configuration different from the continuous concrete production apparatus 10 of the embodiment shown in FIG. The point is that it is used.

That is, in the continuous concrete production apparatus 30 of this embodiment, two screw mixers 32 and 33 having a relatively short overall length are used, and one screw mixer 32 is fixed to a gantry. When the other screw mixer 33 is not in use, it can be housed under the one screw mixer 32, and when in use, as shown in FIG. The upper open part on the starting end side is positioned and the longitudinal axes of both screw mixers are positioned so as to be substantially orthogonal.

Such a continuous concrete production apparatus 30
Since the screw mixer is divided into two parts, the manufacturing apparatus 30 can be reduced in size while taking a sufficient total length of the screw mixer, and as shown in FIG. It can be easily transported to the destination.

When the continuous concrete production device 30 is transported to a destination on a trailer 31 and used, the trailer parking position at the destination includes a thin-material storage tank 3.
4. The coarse aggregate storage tank 35, the cement storage tank 36, and the water storage tank 37 are installed in advance or after trailer parking, and these tanks are connected to the main part of the continuous concrete production apparatus 30 by various parts such as communication pipes. Can be used.

In the above-described concrete continuous production apparatus according to the embodiment of the present invention, the casing of the screw mixer is open at the top, but a cylindrical casing may be used instead. However, in this case, since the positions where the fine aggregate, water, cement, and coarse aggregate are charged are different, it is necessary to provide an inlet at each position.

Further, in the above-described concrete continuous production apparatus according to the embodiment of the present invention, the concrete which has been roughly kneaded by the screw mixer is immediately introduced into the kneading box device. The present invention is not limited to the embodiment, and the concrete coarsely kneaded by the screw mixer may be fed to the kneading box device by feeding means and fed.

That is, as means for feeding the concrete roughly kneaded by the screw mixer to the kneading box device, a discharge port of the screw mixer and an inlet end of the kneading box device are connected by a pipe, and the pressure of the screw mixer is used. Means for sending the concrete to the kneading box, or means for transferring the coarsely kneaded concrete from the screw mixer to a belt conveyor and feeding the conveyed material to the kneading box device by this conveyor, etc. can be adopted.

[0046]

As described above, according to the method and apparatus for continuous production of concrete of the present invention, the necessary materials for the screw mixer are continuously supplied at different charging positions, and are kneaded while being fed. Since the mixture is kneaded, and then the main kneading is performed by a continuous charging type kneading box device, high-quality concrete can be manufactured continuously and in a short time.

[Brief description of the drawings]

FIG. 1 is a front view showing a continuous concrete production apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing a screw mixer used in the continuous concrete production apparatus shown in FIG.

FIG. 3 is a plan view showing a main part of the screw mixer shown in FIG. 2;

FIG. 4 is a perspective view showing an example of an element of a continuous charging type kneading box device used in the continuous concrete production device shown in FIG.

FIG. 5 is a plan view showing a continuous concrete production apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Continuous concrete production apparatus according to one embodiment 11 Screw mixer 11a Upper open casing 11b Screw 11c Screw shaft 11d Discharge port 12 Material storage tank 13 Electric motor 14 Paddle 15 Fine aggregate input section 16 Water supply section 17 Cement input section 18 Coarse aggregate input section 19 Mount 20 Continuous kneading box device 21 Element 22 Inlet end 22a, 22b Inlet part 23 Outlet end 23a, 23b Outlet part 24a, 24b Deformed passage 30 Continuous concrete production apparatus 31 according to another embodiment 31 Trailer 32 Screw mixer 33 Screw mixer 34 Fine aggregate storage tank 35 Coarse aggregate storage tank 36 Cement storage tank 37 Water storage tank

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Shinoda 2--10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Shinichi Igawa 2- 10-26 Fujimi, Chiyoda-ku, Tokyo F term in Maeda Corporation (reference) 4G056 AA06 CB31 CC11 CC31 CC37 CC39 CD01 CD11 CD31 DA01

Claims (6)

[Claims] 1. A mortar-forming material is charged from one end side into a screw mixer having a plurality of paddles for mixing and kneading arranged inside a casing, the mortar is mixed and then the mortar-forming material is charged. The coarse aggregate is put into the mortar in the casing from another position closer to the other end side than the one end side and kneaded as concrete, and then the discharge port formed on the other end side of the screw mixer A concrete continuous production method comprising discharging the kneaded concrete from a kneader, and putting the concrete into a kneading box device of a continuous charging type to perform main kneading. 2. The continuous concrete production method according to claim 1, wherein the screw mixer is installed so as to be inclined upward in the traveling direction of the concrete as the kneaded material. 3. The continuous concrete production method according to claim 2, wherein the screw mixer is installed so as to be inclined upward in a feeding direction. 4. A screw mixer having a long opening from one end side to the other end side and a discharge port at the other end side in an upper part of a casing having a screw provided with a plurality of paddles for kneading, and the screw mixer. A mortar forming material charging section for charging the mortar forming material and a coarse aggregate charging section for charging coarse aggregate into the mortar in the casing from another position closer to the discharge port side from the charging section; and the screw mixer. A kneading box device for further kneading the mixed concrete, wherein the kneading box device has an inlet at one end and an outlet at the other end, and has a cross-sectional shape from the inlet to the outlet. A plurality of deformed passages that continuously change and extend in the axial direction, and are provided between the inlet and the outlet of the deformed passages and pass through the deformed passages; Converging / dividing means for merging and dividing materials, wherein concrete coming out of the outlet of the screw mixer is continuously charged from the inlet, and the deformed passages are passed toward the outlet. A continuous concrete production apparatus characterized by kneading by: 5. The continuous concrete production apparatus according to claim 4, wherein the screw mixer is installed so as to be inclined upward in the traveling direction of the concrete as the kneaded material. 6. The continuous concrete production apparatus according to claim 5, wherein the screw mixer is installed to be inclined upward in a feeding direction.