JPH05208414A - Method and device for manufacturing ready-mixed concrete - Google Patents

Abstract

PURPOSE:To keep a compounding quantity of water of ready-mixed concrete, which is manufactured, at the optimum value. CONSTITUTION:Cement and sand having appropriate weight and somewhat less water are loaded into a concrete mixer 1 constituted of a kneading tank 1a and mixing paddle 1b, water content of mortar formed by kneading is detected by a R1 water meter 9 provided on a sampling cylinder 3 communicating with a kneading tank 1a, the water content is compared with water content corresponding to a compounding ratio of ready-mixed concrete which is to be manufactured by a controller 17 and opening or closing instruction signal is applied to an opening and closing valve 15 provided in a pipe line 14 to replenish insufficient water content. Then after insufficient amount of the water is loaded into the kneading tank 1a from a water tank 13 through the pipe line 14 and appropriate quantity of gravel is loaded further, the mortar and gravel are kneaded and the ready-mixed concrete is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fresh concrete manufacturing method and a fresh concrete manufacturing apparatus.

[0002]

2. Description of the Related Art In batcher plants, cement, water,
Weigh each material such as sand and gravel, add cement, water and sand to the concrete mixer and knead them to generate mortar, and then add gravel to the mortar during kneading and knead it. Manufactures concrete.

However, since the amount of water adhering to the surface of sand is likely to fluctuate, the operator of the batcher plant must have an appropriate amount of water to put into the concrete mixer based on experience when producing ready-mixed concrete. I am adjusting.

[0004]

However, it cannot be said that the blending amounts of water and sand adjusted by the experience of the operator are necessarily the optimum values.

Further, in the case of producing high performance concrete (HPC), which has been studied in recent years, if the amount of water is not appropriate, there are problems such as solidification and impaired fluidity which are most important for HPC. is there.

In view of the above-mentioned situation, the present invention detects the water content of mortar during kneading and compares the water content with the required water content to replenish the insufficient water content, thereby adjusting the water content of green concrete to be produced. The object of the present invention is to provide a method for producing ready-mixed concrete and an apparatus for producing ready-mixed concrete that can maintain the optimum value.

[0007]

A first aspect of the present invention is to provide a weight of cement and sand corresponding to the weight of green concrete to be produced, and water slightly less than the weight of raw concrete to be produced. Is added to a concrete mixer and kneaded to produce mortar, and then the amount of water in the mortar is detected and the amount of water is compared with the amount of water corresponding to the mixing ratio of fresh concrete to be produced, which is insufficient. The amount of water to be added to the concrete mixer, and a method for producing fresh concrete by adding gravel of a weight corresponding to the weight of fresh concrete to be produced to the concrete mixer and kneading with mortar, the second invention is, A concrete mixer comprising a kneading tank and a mixing paddle rotatably supported in the kneading tank; a sampling cylinder communicating with the kneading tank; Configuration comprising a moisture meter provided in a sampling cylinder, a pipeline with an on-off valve that supplies water from a water source to the kneading tank, and a control device that outputs an open / close instruction signal to the on-off valve based on a detection value of the moisture meter I am trying.

[0008]

Therefore, according to the present invention, cement, sand and a little less water having a weight corresponding to the weight of green concrete to be produced are put into the concrete mixer, and the mortar produced by kneading is communicated with the kneading tank. A control device that draws into the sampling cylinder, detects the amount of water in the mortar drawn into the sampling cylinder by a moisture meter provided in the sampling cylinder, and receives a detection signal from the moisture meter, detects the amount of moisture and the fresh concrete to be produced. The amount of water corresponding to the mixing ratio of is compared, and in order to input the insufficient amount of water into the concrete mixer, an opening / closing instruction signal is output to the on-off valve and water is supplied to the concrete mixer from a water source such as a water tank via a pipeline. Then, add a weight of gravel corresponding to the weight of fresh concrete to be produced to the concrete mixer and And Le and gravel to produce a kneaded raw concrete.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow sheet showing an outline of an apparatus for producing ready-mixed concrete for carrying out the method for producing ready-mixed concrete of the present invention, and FIG. 2 is a sectional view showing the outline of a sampling cylinder related to FIG. A concrete mixer 1 comprising a kneading tank 1a having a predetermined capacity and a mixing paddle 1b rotatably supported inside the kneading tank 1a is provided, and the mixing paddle 1b of the kneading tank 1a of the concrete mixer 1 is arranged in the axial direction. A hole 2 having a required diameter is provided at a predetermined position on the side wall, and one end of a sampling cylinder 3 having a diameter substantially the same as the diameter of the hole 2 is attached at a position of the hole 2 in a direction orthogonal to the side wall of the kneading tank 1a. A hydraulic cylinder 4 which can expand and contract in the extending direction of the sampling cylinder 3 is provided at the center of the other end of the sampling cylinder 3, and the tip of the rod 5 of the hydraulic cylinder 4 reciprocates and slides in the sampling cylinder 3. A piston 6 to be obtained is provided, a wear resistant plate 8 of the same quality as the wear resistant plate 7 on the inner surface of the kneading tank 1a is attached to the side of the kneading tank 1a of the piston 6, and the hydraulic cylinder 4 is extended. Wherein the wear plate 8 of the kneading tank 1a inner surface of the wear plate 7 piston 6 adapted to form a same plane (it may also be used pneumatic cylinder in place of the hydraulic cylinder 5).

An RI moisture meter 9 is provided outside the sampling cylinder 3. The RI moisture meter 9 has a moisture meter body 10 including a radiation source 10a that emits radiation and a neutron detector 10b that detects neutrons in the radiation, an apparatus for operating the moisture meter body 10, and a display for displaying a detected value. And a coefficient display 11 having a panel and a microcomputer incorporated therein. The moisture meter main body 10 is arranged so that the radiation source 10a and the neutron detector 10b face each other with the sampling cylinder 3 interposed therebetween. The coefficient display 11 is incorporated in a controller 17 described later, and is connected to the moisture meter main body 10 via a cable 12.

Further, in order to replenish the concrete mixer 1 with water, a water tank 13 capable of storing makeup water is provided, and a pipe line 14 for feeding makeup water from the water tank 13 to the kneading tank 1a of the concrete mixer 1 is provided in the water tank. 13 which is provided between the kneading tank 13 and the kneading tank 1a and which is opened / closed by an opening / closing instruction signal output from a control device 17 described later, and a flow amount for detecting the amount of flowing water in the pipeline 14 and feeding back the flow amount to the control device Total 1
6 and 6 are provided in the pipe line 14.

Furthermore, a coefficient display 11 is incorporated inside, and the water content corresponding to the mixing ratio of the ready-mixed concrete to be produced based on the detected value of the neutrons from the water content meter main body 10 input to the coefficient display 11. The amount of water to be replenished is calculated in comparison with the amount, an open instruction signal is output to the on-off valve 15, and the on-off valve 15 is fed when the amount of flowing water fed back from the flow meter 16 reaches the replenishment water amount. A control device 17 capable of outputting a closing instruction signal is provided.

Next, the operation will be described. Cement and sand having a weight corresponding to the weight of the fresh concrete to be manufactured are weighed by a weighing hopper (not shown) and charged into the concrete mixer 1, and the amount of water in the concrete mixer 1 further changes to that of the fresh concrete to be manufactured. After water was added to the concrete mixer 1 so as to be slightly less than the water content corresponding to the mixing ratio, and the mixing paddle 1b was rotationally operated to knead the cement, sand and water to generate mortar. By moving the hydraulic cylinder 4 in the direction in which the rod 5 is shortened and moving the piston 6 inward of the sampling cylinder 3, part of the mortar is drawn into the sampling cylinder 3 communicating with the kneading tank 1a.

Next, the operating device of the coefficient display 11 is operated to cause the radiation source 10a to emit radiation, and the neutron detector 10b is used to determine the rate of remaining fast neutrons that have passed through the mortar drawn into the sampling cylinder 3. Let it be detected. Neutron detector 10 for detecting the rate of remaining fast neutrons
b, the detected value is converted into a signal and output to the coefficient display 11 via the cable 12, and the coefficient display 1 that has received the signal.
The signal 1 is converted into a numerical value of the water content by the built-in microcomputer and displayed on the display panel. Then, the hydraulic cylinder 4 is actuated in the direction in which the rod 5 extends, and the piston 6 is moved to the kneading tank 1a side, so that the mortar after moisture detection is pushed back into the kneading tank 1a.

When the coefficient display 11 receives the detection value detected by the neutron detector 10b as a signal, the control device 17 operates and compares it with the water content corresponding to the mixing ratio of the ready-mixed concrete to be manufactured based on the detection value. The amount of water to be replenished is calculated, an open instruction signal is output to the on-off valve 15 provided in the pipe 14, and the water stored in the water tank 13 is supplied via the pipe 14 to the kneading tank 1a of the concrete mixer 1. The flow meter 16 provided in the pipe 14 detects the amount of water flowing in the pipe 14. When the flowing water amount fed back from the flow meter 16 to the control device 17 reaches the supplementary water amount, the control device 17 outputs a close instruction signal to the opening / closing valve 15.

Further, a gravel having a weight corresponding to the weight of the fresh concrete to be manufactured is weighed by a weighing hopper (not shown) and charged into the concrete mixer 1, and then the mixing paddle 1b is rotatably operated to remove mortar and gravel. Is mixed to produce ready-mixed concrete.

According to the above, the RI moisture meter 9 is attached to the sampling cylinder 3 provided in the kneading tank 1a of the concrete mixer 1, and the RI moisture meter 9 automatically detects the moisture content of the mortar during kneading, Water tank 1 based on the detected value
Since it is configured so that the insufficient water content can be replenished from 3, it is possible to maintain the optimum mixing amount of water in the green concrete produced.

It should be noted that the present invention is not limited to the above-described embodiment, and in the above-mentioned embodiment, the moisture meter R
I When using a moisture meter and a water tank as the water source,
However, it is needless to say that other moisture meters and water sources other than the water tank may be used, and that various changes may be made without departing from the scope of the present invention.

[0020]

EFFECT OF THE INVENTION According to the method for producing ready-mixed concrete and the apparatus for producing ready-mixed concrete of the present invention, various excellent effects as described below can be obtained.

I) The machine side of the concrete mixer automatically detects the water content of the mortar during kneading, and the water content of the deficient mortar can be replenished based on the detected value. The compounding amount of can be maintained at the optimum value.

II) Since the compounding amount of water can be kept at an optimum value, it becomes possible to produce concrete such as high performance concrete which is sensitive to the influence of the amount of water.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an outline of an apparatus for producing ready-mixed concrete for carrying out the method for producing ready-mixed concrete according to the present invention.

FIG. 2 is a schematic cross-sectional view of a sampling cylinder related to FIG.

[Explanation of reference numerals] 1 concrete mixer 1a kneading tank 1b mixing paddle 3 sampling cylinder 9 RI moisture meter (moisture meter) 13 water tank (water source) 14 conduit 15 open / close valve 17 controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Yokoi 3174 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa Ishikawashima Construction Machinery Co., Ltd. Yokohama factory

Claims (2)

[Claims] 1. A cement and sand having a weight corresponding to the weight of green concrete to be produced, and water slightly less than the weight corresponding to the weight of raw concrete to be produced are put into a concrete mixer and kneaded. Produce mortar,
Next, the water content of the mortar is detected and the water content is compared with the water content corresponding to the mixing ratio of the fresh concrete to be produced, and the insufficient water amount is added to the concrete mixer, and the fresh concrete to be produced further. A method for producing green concrete, characterized in that a weight of gravel corresponding to the weight of 1 is put into the concrete mixer and kneaded with mortar to produce green concrete. 2. A concrete mixer comprising a kneading tank and a mixing paddle rotatably supported in the kneading tank, a sampling cylinder communicating with the kneading tank, a moisture meter provided in the sampling cylinder, and a water source. An apparatus for producing ready-mixed concrete, comprising: a pipeline with an on-off valve that supplies water to the kneading tank; and a control device that outputs an on-off instruction signal to the on-off valve based on a detection value of the moisture meter.