JP2001071321A - Method for continuously producing concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for continuously producing concrete, in which conrete having high quality is continuously produced in a short time by continuously supplying necessary material and kneading it. SOLUTION: In a screw mixer 11, a screw 11b equipped with a plurality of paddles 14 for kneading is arranged in the inside of a casing 11a. Material for forming mortar is charged into the screw mixer 11 from one end side thereof and mortar is kneaded. Then, crude aggregate is charged to mortar in the casing 11a from the different position near to the other end side from the position of one end side, in which material for forming mortar is charged, and kneaded as concrete. Thereafter, kneaded concrete is discharged from a discharge port 11d formed on the other side of the screw mixer 11. Then, concrete taken out of the discharge port of the screw mixer is carried to the concrete placing site and used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing concrete, and more particularly to a method 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 the above-mentioned conventional problems, and continuously supplies and kneads necessary materials to produce high-quality concrete continuously and in a short time. It is an object of the present invention to provide a method for continuously producing concrete.

[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 according to the present invention is characterized in that a mortar forming material is fed from one end side into a screw mixer in which a screw having a plurality of paddles for kneading is arranged inside a casing and fed while kneading the mortar. Then, the coarse aggregate is put into the mortar in the casing from another position closer to the other end than the position on the one end side where the mortar forming material is put, and the mixture is fed while kneading as concrete, and then screwed The mixed concrete is discharged from a discharge port formed at the other end of the mixer.

<Specific Configuration in the Present Invention> The method for continuously producing concrete according to the present invention comprises the above-mentioned essential components, but is applicable even when the components are specifically as follows. The concrete component is that the mortar forming material is composed of at least fine aggregate, water and cement, and the fine aggregate, water, and then cement are continuously arranged at different positions from the one end side of the screw mixer as a charging order. That is, quantitative input.

[0010] In the method for continuously producing concrete according to the present invention, the screw mixer is provided so as to be inclined upward in the traveling direction of the concrete as the kneaded material.
In this case, it is preferable that the screw mixer is installed to be inclined upward in the feeding direction.

According to the continuous concrete production method of the present invention having such features, a mortar material such as cement, fine aggregate and water is appropriately supplied to the 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, coarse aggregate is charged into the mortar in the casing from another position closer to the other end side than the position on one end side where the mortar forming material is charged, and the mortar is fed while mixing as concrete, and then the screw mixer is fed. The mixed concrete is discharged from a discharge port formed at the other end of the concrete. In this way, the mortar is first kneaded and mixed with the screw mixer, and then the coarse aggregate is introduced from another position closer to the discharge port side to be concrete.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the continuous concrete production method of the present invention will be described below in more detail. FIG. 1 shows a continuous concrete manufacturing apparatus 10 for implementing a continuous concrete manufacturing method according to one embodiment of the present invention. The continuous concrete manufacturing apparatus 10 includes a gantry 1
9 is provided with a screw mixer 11 supported.

In the vicinity of the gantry 19 supporting the screw mixer 11, at least cement, fine aggregate (sand),
Each of the storage tanks (only one storage tank 12 is shown in FIG. 1) is provided to supply each material such as coarse aggregate (gravel, crushed stone, etc.) to the screw mixer 11.

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.

A discharge port 11d for discharging the kneaded material is provided below the casing 11a at the end side of the screw mixer 11, and the casing 11a is screwed by a screw 11b.
The concrete sent inside a flows out from this outlet 11d. Casing 11 of screw mixer 11
As shown in FIGS. 1 and 2, four material input sections are provided on the open section in FIG. 1A 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 through a communication pipe 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 a kneaded material, and the inclination angle is 10 to 15
Degree is preferred.

Next, the continuous concrete production method according to this embodiment will be described together with the operation of the continuous concrete production apparatus 10. Fine aggregate such as sand is continuously and quantitatively supplied from the fine aggregate input section 15 located at the most end side of the screw mixer 11, and the fine aggregate is injected into the casing 11a from an upper open portion of the casing 11a. , While being stirred by the screw 11b. Water is continuously supplied to the fine aggregate fed in the casing in this manner from the water supply unit 16 adjacent to the fine aggregate input unit 15, and the fine aggregate is well mixed with the screw 11b. I can't.

Thereafter, water adheres evenly to the surrounding surface, and cement is continuously and quantitatively injected from the cement input section 17 into the fine aggregate being fed in the feeding direction in the casing 11a, and 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 by the paddle 14 attached to the screw shaft 11c while being sent in the feeding direction. After the mixing and feeding of such mortar by the screw 11b with paddles has been continued for a while, coarse aggregate such as gravel is moved from the aggregate input section 18 provided at another position closer to the terminal side than the cement input section 17. The mortar is quantitatively supplied 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 in the casing 11a always acts on the starting end side, so that it stays in the screw groove. In this case, the paddle 14 and the screw itself stir the mixture, so that the effect of kneading is more exerted. However, if the inclination angle of the screw mixer 11 is too large, the injected water flows backward to the start end side, and the inclination angle is the same as the above-mentioned inclination angle.
About 15 degrees is desirable.

The concrete is continuously screwed 11
b while being fed toward the terminal end of the screw mixer 11,
The concrete is discharged from a discharge port 11d formed at the end of the concrete, and is transported to the concrete placing site by using a suitable transporting means such as a vehicle or a conveyor device.

In the above-described concrete continuous production method, an example in which one screw mixer is used has been described, but it is also possible to use two screw mixers having a relatively short overall length. That is, FIG. 4 shows a continuous concrete manufacturing apparatus 20 according to another configuration example.

The continuous concrete production apparatus 20 is constituted by dividing a screw mixer into two units, and loading the screw mixer on a trailer 21 so as to be transportable. In this case, one of the two screw mixers 22 and 23 is fixed to the gantry, and the other screw mixer 23 can be stored in the lower part of one screw mixer 22 when not in use. Mixer 2
The two screw mixers 22 and 23 are positioned and used so that the upper opening portion on the starting end is located immediately below the discharge port on the end side of 2 and the longitudinal axes of both screw mixers 22 and 23 are substantially orthogonal.

By using the two screw mixers 22 and 23 having a relatively short overall length as described above, the apparatus 2 can be used when not in use.
The entire apparatus can be miniaturized, and the device 20 can be loaded on the trailer 21 or the like and easily transported to the concrete placing site, where the concrete can be continuously produced and supplied to the concrete placing section.

In the above-described concrete continuous production apparatus according to the embodiment of the present invention, the casing of the screw mixer has an open 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.

[0029]

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. Therefore, 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 manufacturing apparatus for performing a continuous concrete manufacturing method 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 plan view showing another example of the configuration of the continuous concrete production device that performs the continuous concrete production method according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 continuous concrete production apparatus 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 DESCRIPTION OF SYMBOLS 19 Stand 20 Concrete continuous manufacturing apparatus 21 Trailer 22 Screw mixer 23 Screw mixer

 ──────────────────────────────────────────────────続 き Continued 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 Construction Industry Co., Ltd. (reference) 4G056 AA06 CB02 CB07 CB08 CB15 CC11 CC39 DA01 4G078 AA04 AA11 AB02 BA01 CA06 DA09 EA10

Claims (4)

[Claims] 1. A mortar-forming material is fed from one end of a screw mixer having a plurality of paddles for kneading and arranged inside a casing, and the mortar is fed while being kneaded. Feeding coarse aggregate 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 material was charged and mixing and mixing as concrete,
Then, the continuous concrete manufacturing method is configured to discharge the mixed concrete from a discharge port formed at the other end of the screw mixer. 2. The mortar forming material is composed of at least fine aggregate, water and cement, and the fine aggregate, water and then cement are continuously placed at different positions from the one end side of the screw mixer. 2. The method for continuously producing concrete according to claim 1, wherein the concrete is charged at a constant rate. 3. The method for continuously producing concrete according to claim 1, wherein the screw mixer is installed so as to be inclined upward in the direction in which the concrete as the kneaded material travels. 4. The continuous concrete production method according to claim 3, wherein the screw mixer is installed so as to be inclined upward in a feeding direction.