WO2019102850A1

WO2019102850A1 - Mixture formation system

Info

Publication number: WO2019102850A1
Application number: PCT/JP2018/041333
Authority: WO
Inventors: 慎也伊藤; 一裕相澤; 彰宏保利; 盛岡　実
Original assignee: デンカ株式会社
Priority date: 2017-11-22
Filing date: 2018-11-07
Publication date: 2019-05-31
Also published as: JPWO2019102850A1; JP7145171B2; CN111356564A

Abstract

This mixture formation system (1) comprises: a slurry production means (10) which produces an admixture slurry; an admixture supply means (20) which supplies an admixture; a liquid supply means (30) which supplies a liquid; a measurement means (40) which measures the supply amounts of the admixture and the liquid; a setting means (51) which sets the supply amounts of the admixture and the liquid; a control means (50) which controls the supply amounts of the admixture and the liquid; a pressure feed means (60) which supplies the admixture slurry to a pressure feed hose (61); and a concrete conveyance means (70) which has a storage/agitation mechanism (71) that stores and agitates a concrete. The fluctuation range of the supply amount of the admixture is 3% by mass or less; the fluctuation range of the supply amount of the liquid is 2% by mass or less; and the admixture slurry is supplied to the storage/agitation mechanism (71). Consequently, the present invention is able to provide a mixture formation system for efficiently mixing an admixture in the form of a powder with a ready-mixed concrete that has been conveyed to a construction site by means of an agitator vehicle.

Description

Mixture generation system

The present invention relates to a mixture generation system for mixing powdered admixtures in concrete or mortar.

Admixtures are materials other than cement, water and aggregate, and are materials added as needed before casting in order to impart special properties to concrete and the like. Admixture materials may be used by being added to a mixer at the time of kneading, in addition to cases where they are already mixed with cement at the time of kneading of concrete.
For example, the admixture for cement grout described in Patent Document 1 can be added to a cement grout by introducing it into a stirrer such as an agitator car at a cement grout placing site or a field installation type agitator, or a mixer installed at the site. It is added.

JP, 2011-132041, A

However, if the admixture is in powder form, adding the admixture directly to the agitator car may result in insufficient dispersion of the admixture in the concrete. In that case, a mass of the admixture remains in the concrete, and the mass may cause variations in the physical properties of the hardened concrete or adversely affect the concrete. In addition, although it is possible to mix the admixture with the concrete without dispersion by the method of performing re-kneading after adding the powdery admixture to the concrete, it is necessary to separately prepare a mixer at the construction site. Moreover, in the method, in the case of concrete having rapid hardness, it is necessary to wash the mixer at the construction site immediately after mixing, which results in increase in the treatment of washing water and the number of working steps. In order to solve these problems, it is important to establish a method of adding directly to the agitator car and increasing the mixing property to concrete.

When adding powdery admixtures to concrete that has arrived at the construction site, a method of increasing admixtures by slurrying the admixtures may be mentioned.
Slurrying of the powdery admixture can be carried out by stirring and mixing at a construction site using a mixer. However, in the case where the material is weighed, kneaded, and added to the agitator car manually, it is necessary to manufacture and add a plurality of tens of kg of slurry per agitator car several times. In this case, the heavy load is transported to the upper portion of the mixer drum of the agitator car, which is also dangerous for operation. When powdery admixtures are added as a slurry to concrete, part of the water is added to the concrete. Since it is important to control the water-cement ratio when considering the durability of concrete, it is necessary to make a slurrying method that minimizes human error as much as possible.

From the above, it is an object of the present invention to provide a mixture generation system for efficiently mixing powdery admixtures with fresh concrete transported to a construction site by an agitator vehicle.

The present inventors diligently researched to achieve the above-mentioned purpose, and have come up with a system capable of performing kneading, supply to an agitator car from measurement of powdery admixtures without relying on human power. . In addition, the system can minimize human error of mistaking the volume ratio between the admixture and the liquid when slurrying the powdered admixture. Thereby, the present inventors were able to achieve the above-mentioned object.
The present invention is based on the above findings, and the gist of the present invention is as follows.

(1) Slurry production means for producing a slurry of admixture from powdery admixture and liquid, admixture supply means for feeding admixture to the slurry production means, liquid feed means for feeding liquid to the slurry production means A metering means for measuring the supply amount of the mixing material supplied to the slurry production means and the supply amount of the liquid; a setting means for setting the supply amount of the mixing material to be supplied to the slurry production means and the supply amount of the liquid; The supply amount of the mixing material supplied by the mixing material supply means and the liquid supply means are supplied so that the supply amount of the mixing material to the manufacturing means and the supply amount of the liquid become the set supply amount set by the setting means. Control means for controlling the supply amount of the liquid, pumping means for feeding the admixture slurry produced by the slurry producing means to The fluctuation range of the supply amount of the mixing material controlled to the set supply amount by the control means is 3 mass% or less, and is set by the control means. The fluctuation range of the supply amount of liquid controlled to be the supply amount is 2 mass% or less, and the admixture slurry is supplied to the storage and agitation mechanism through a pressure hose, concrete and admixture Mixture generation system to obtain a mixture with the slurry.
(2) The mixture production system according to the above (1), wherein the time from supplying the admixture and the liquid to completing the admixture slurry is within 120 seconds.
(3) The mixture production system according to the above (1) or (2), wherein the time for supplying the admixture slurry to the storage and stirring mechanism after supplying the admixture material to the slurry production means is within 7 minutes.
(4) A retarder water storage means for storing retarder water and a retarder water pressure feeding means for feeding retarder water to the retarder water pressure feeding hose are further provided, and the mixture is discharged from the concrete transport means and then stored. The retarder water is supplied to the stirring mechanism through the retarder water pressure feeding hose using the retarder water pressure feeding means, and the storage and stirring mechanism is cleaned with the retarder water according to any one of the above (1) to (3) The mixture generation system as described in.
(5) A liquid storage means for storing liquid and a power supply means for supplying power for driving the control means are further provided, and the means other than the concrete transport means are mounted on the same movable carriage. The mixture generation system according to any one of (1) to (4).
(6) The mixture production system according to any one of the above (1) to (5), wherein the concrete transport means is an agitator.
(7) The admixture feed means includes a powder feed screw shaft which is rotationally driven about its axis and feeds the admixture in the axial direction, and a variable speed drive motor which rotationally drives the powder feed screw shaft so as to change its speed. The mixture production system according to any one of the above (1) to (6), wherein the supply amount of the admixture is adjusted by the rotation speed thereof.
(8) The slurry production means comprises a stirring tank, a rotary shaft provided at the bottom of the stirring tank and extending vertically in the stirring tank, and a stirring blade attached to the rotary shaft, and the stirring blade is connected to the rotary shaft And the plurality of stirring blades extending radially outward from the central portion, the stirring blades extend radially outward from the periphery of the central portion, and the front end of the stirring blades is higher than the rear end The material passing portion is formed by providing the stirring blades at an interval between adjacent stirring blades so as to form a material passing portion, and the auxiliary wing portion is fixed to the tip end side in the radial direction of the stirring blades. The wing portion has an annular shape or a flat plate shape obtained by dividing an annular shape, and is provided on the outer side of the material passage portion in the inside and outside directions of the rotation diameter, and the tip of the stirring blade in the radial direction With a portion located more radially outward than Mixture generation system according to any one of the serial (1) to (7).
(9) Admixture materials are fly ash, blast furnace slag fine powder, silica fume, expansive material, quick hardwood, quick-setting material, admixture for high strength, limestone fine powder, crushed stone powder, sludge powder and sewage sludge fine powder The mixture generation system according to any one of the above (1) to (8), which is at least one admixture selected from the group consisting of

According to the present invention, it is possible to provide a mixture generation system for efficiently mixing powdery admixtures with fresh concrete transported to a construction site by an agitator vehicle.

FIG. 1 is a diagram for explaining a mixture generation system 1 in an embodiment of the present invention. Fig.2 (a) is a figure for demonstrating the slurry manufacturing apparatus in the mixture production system 1 in one Embodiment of this invention, FIG.2 (b) demonstrates the stirring blade provided in the said slurry manufacturing apparatus. FIG. FIG. 3 is a figure for demonstrating the admixture supply apparatus in the mixture production system 1 in one Embodiment of this invention. FIG. 4 is a view for explaining cleaning of the agitator wheel in the modification of the mixture generation system 1 according to the embodiment of the present invention. FIG. 5 is a view for explaining the mounting on a movable carriage of a modified example of the mixture generation system 1 according to an embodiment of the present invention. FIG. 6 is a figure for demonstrating a mortar continuous kneading apparatus.

Hereinafter, a mixture generation system 1 according to an embodiment of the present invention will be described with reference to FIG. The mixture production system 1 in one embodiment of the present invention obtains a mixture of concrete and the admixture slurry 4. A mixture generation system 1 according to an embodiment of the present invention includes a slurry producing means 10 for producing an admixture slurry 4 from a powdery admixture 2 and a liquid 3, and an admixture for supplying the admixture 2 to the slurry producing means 10. A supply means 20, a liquid supply means 30 for supplying the liquid 3 to the slurry production means 10, a metering means 40 for measuring the feed amount of the admixture 2 supplied to the slurry production means 10 and the feed amount of the liquid 3; The setting means 51 for setting the supply amount of the admixture 2 and the supply amount of the liquid 3 supplied to the production means 10, and the supply amount of the admixture 2 and the supply amount of the liquid 3 to the slurry production means 10 Supply amount of the miscible material 2 supplied by the miscible material supply unit 20 and the supply amount of the liquid 3 supplied by the liquid supply unit 30 so that the set supply amount set by It has a control means 50 for controlling, a pumping means 60 for supplying the admixture material slurry 4 produced by the slurry producing means 10 to the pumping hose 61, and a concrete conveying means 70 having a storage and stirring mechanism 71 for storing and stirring concrete. . Then, the admixture slurry is supplied to the storage and agitation mechanism 71 through the pressure feed hose 61. The mixture generation system 1 according to an embodiment of the present invention efficiently mixes powdery admixture material with fresh concrete transported by an agitator vehicle to a construction site by having the above-described configuration. Can.

(Slurry production means)
The slurry production means 10 produces the admixture slurry 4 from the powdered admixture 2 and the liquid 3. The slurry production means 10 is, for example, a slurry production apparatus 10 shown in FIG. The slurry production apparatus 10 will be described in more detail with reference to FIG.

Fig.2 (a) is a figure for demonstrating the slurry production apparatus 10 in the mixture production system 1 in one Embodiment of this invention, FIG.2 (b) demonstrates the stirring blade provided in the slurry production apparatus 10 FIG. The slurry production apparatus 10 is an apparatus for producing a admixture slurry by stirring and mixing a powdered admixture and a liquid. The slurry manufacturing apparatus 10 is provided at the stirring tank 11 and at the bottom of the stirring tank 11, and attached to the rotating shaft 12 extending vertically in the stirring tank 11, the drive device 13 for rotationally driving the rotating shaft 12, and the rotating shaft 12 And the stirring blade 14.

The stirring tank 11 contains the admixture 2 supplied from the admixture supply means 20 and the liquid 3 supplied from the liquid supply means 30, and also accommodates the admixture material slurry 4 produced from the admixture 2 and the liquid 3 . The shape of the stirring tank 11 is not particularly limited, but it is preferable that the stirring tank 11 be a rectangular housing in plan view with the upper part opened.

The rotating shaft 12 transmits the driving force generated by the driving device 13 to the stirring blade 14 to rotate the stirring blade 14. The bottom of the stirring tank 11 is provided with the through-hole regarding the inside and outside, and the rotating shaft is passed through the through-hole. Between the inner periphery of the through hole and the rotary shaft 12, in order to prevent the material contained in the stirring tank 11 from leaking, it is sealed by a known sealing means (not shown). Below the rotation shaft 12, a stirring blade side pulley 121 is provided, and the driving force by the drive device 13 is transmitted to the rotation shaft 12 via the belt 15. In addition, the driving force by the drive device 13 may be transmitted to the rotating shaft 12 via the gear. Alternatively, a drive may be disposed below the rotation shaft 12 so that the drive rotates the rotation shaft directly. The rotational speed of the rotating shaft 12 is, for example, 750 to 1000 rpm.

The driving device 13 is an internal combustion engine or a motor that generates a driving force for rotating the stirring blade 14. A drive device-side pulley 131 is provided below the drive device 13, and the driving force is transmitted to the belt 15 via the drive device-side pulley 131. Then, as described above, the driving force transmitted to the belt 15 is transmitted to the rotary shaft 12 via the stirring blade side pulley 121, whereby the stirring blade 14 is rotated. By having such a configuration, the load of the drive device 13 can be made constant, the fluctuation of the current value supplied to the drive device can be reduced, and the vibration of the slurry production apparatus 10 can be reduced.

The stirring blade 14 stirs and mixes the admixture 2 supplied from the admixture supply means 20 and the liquid 3 supplied from the liquid supply means 30. This produces an admixture slurry. The stirring blade 14 includes a central portion 141 connected to the rotation shaft, and a plurality of stirring blades 142 extending radially outward from the central portion 141. The stirring blade 142 extends radially outward from the periphery of the central portion 141, and is obliquely provided such that the front end of the stirring blade 142 is higher than the rear end. The stirring blade 14 preferably has 2 to 10, more preferably 3 to 6, and more preferably 3 to 4 stirring blades.

A material passing portion 143 is formed by providing the stirring blades 142 at intervals between adjacent stirring blades 142. By rotating the stirring blade 14 by the rotation of the rotating shaft 12, the admixture slurry in the stirring tank 11 can be moved downward from the material passing portion 143 by the stirring blade 142. Thereby, the vortex of the admixture slurry generated in the stirring tank 11 can be enlarged, and the admixture and the liquid can be mixed uniformly throughout the entire stirring tank 11, and the uniform admixture slurry can be made in a short time. It can be manufactured.

An auxiliary wing portion 144 is fixed to the radial tip end of the stirring blade 142. The auxiliary wing portion 144 has an annular shape, and is provided on the outer side of the material passing portion 143 in the inward and outward directions of the rotation diameter, and is radially outer than the radial tip of the agitating blade 142 It has a part located on the. The auxiliary wing portion 144 can suppress the material which is pushed downward from the material passing portion 143 by the stirring blade 142 and bounces back at the bottom of the stirring tank 11 going upward. The auxiliary wing portion 144 may have the shape of a flat plate obtained by dividing an annular shape.

The slurry manufacturing apparatus 10 supplies a discharge port 16 for discharging the manufactured admixture material slurry, a discharge port lid 17 for controlling the opening and closing of the discharge port 16, and the pumped mixture means 60 for supplying the discharged admixture material slurry. The discharge chute 18 is further provided.
By producing the admixture slurry while the outlet 16 is closed by the outlet lid 17, the admixture slurry can be produced batchwise. Then, after the admixture slurry is manufactured, by moving the discharge port lid 17 in the direction of the arrow in FIG. Can be supplied.

The slurry production means 10 can produce a uniform admixture slurry from admixture and liquid in a short time by having the above-described configuration.

The time from the supply of the admixture and the liquid to the slurry production apparatus 10 to the completion of the admixture slurry by the slurry production apparatus 10 is preferably within 120 seconds, more preferably within 90 seconds, and further, Preferably, it is within 60 seconds. This makes it possible to shorten the waiting time after arriving at the agitator vehicle site even if the slurry vehicle is started after the agitator vehicle arrives at the construction site. The completed admixture slurry is a slurry in which no lumps of admixture remain.

The admixture used for producing the slurry is not particularly limited as long as it is a powdered admixture. Admixture materials include, for example, fly ash, blast furnace slag fine powder, silica fume, expansive agent, quick hardwood, quick-setting agent, high strength admixture, limestone fine powder, crushed stone powder, sludge powder and sewage sludge fine powder At least one admixture selected from the group.
The admixture used in the mixture generation system 1 in one embodiment of the present invention is preferably an admixture added to concrete at a construction site. Such admixtures include, for example, quick hardwoods, quickeners and expansives.

For example, calcium fluoroaluminate (11CaO · 7Al ₂ O ₃ CaF ₂ ) -based rapid hardening material, amorphous calcium aluminate (12CaO ·· 7Al ₂ O ₃ ) -based rapid-harding materials, auin-based rapid-harding materials, alumina cement-based rapid-harding materials, water-glass-based rapid-harding materials and the like.

The quick-setting agent used for the mixture production system 1 in one embodiment of the present invention includes, for example, inorganic salt-based fasting agents and cement mineral-based fasting agents. Examples of inorganic salt-based quick-setting agents include sodium-containing carbonates, aluminates, silicates, aluminum sulfate, alum and the like. Examples of cement mineral-based accelerators include calcium aluminate and calcium sulfoaluminate.

Examples of the expansive material used in the mixture generation system 1 according to an embodiment of the present invention include calcium sulfoaluminate (CSA) -based expansive material, lime-based expansive material, lime-CSA-based expansive material, and the like. In general, since the expansion material can not be uniformly dispersed by the agitator car, the introduction of the expansion material into the agitator car and the kneading thereof are prohibited. However, in the mixture generation system according to one embodiment of the present invention, even if the expansion material is supplied to the agitator wheel, the expansion material can be uniformly dispersed in the concrete. Thus, it is not necessary to separately prepare a mixer in order to uniformly disperse the expansive material in concrete.

The liquid used to produce the slurry is not particularly limited as long as it can be added to concrete. The liquid is, for example, water or a liquid containing water. The liquid containing water may contain, for example, a liquid admixture as well as water. Liquid admixtures include, for example, AE agents, water reducing agents, AE water reducing agents, high performance water reducing agents, high performance AE water reducing agents, fluidizers, shrinkage reducing agents, durability improving agents, accelerators, dust reducing agents For example, quick-hardening materials, setting / hardening time control agents, thickeners, separation reducing agents, waterproofing agents, anti-corrosion agents, cold resistance accelerators, foaming agents, foaming agents and the like.

The slurry production means used in the mixture production system according to an embodiment of the present invention is shown in FIG. 1 or 2 as long as it can produce a slurry of admixtures from a powdered admixture and a liquid. It is not limited to the slurry manufacturing apparatus 10. For example, the mortar continuous kneading apparatus shown in FIG. 6 can be used as a slurry production means. Hereinafter, the mortar continuous kneading apparatus will be described with reference to FIG.

FIG. 6 is a view for explaining the mortar continuous kneading device 10C. The mortar continuous kneading apparatus 10C is an apparatus for continuously producing mortar, but it is also possible to produce an admixture slurry from powdered admixture and liquid. The mortar continuous kneading device 10C includes a powder supply unit 11C and a slurry kneading unit 12C.

The powder supply unit 11C includes a powder supply screw shaft 114C and a variable speed drive motor 116C, and is configured to be able to adjust the supply amount of the admixture by the rotation speed of the powder supply screw shaft 114C.

The powder feed screw shaft 114C is rotationally driven by the variable-speed drive motor 116C around an axial center inside the hollow cylindrical casing 113C to feed (move) the admixture material in the axial direction. The powder feed screw shaft 114C is preferably a horizontal shaft, but may be inclined.

The powder feed screw shaft 114C is located on the upstream side (right side in the figure) of the helical blade 114Ca provided in the vicinity of the discharge port (left side in the figure) and the helical blade 114Ca and feeds the helical blade 114Ca while loosening the admixture. It has a plurality of stirring plates 114Cb.
The spiral blade 114Ca is a continuous spiral blade having three or more pitches, and is configured to trap the admixture material and supply it in the axial left direction with the hollow cylindrical tube 115C surrounding it. The hollow cylindrical tube 115C is fixed in the casing 113C so as not to rotate.

Stirring plate 114Cb is a radially extending flat plate or inclined plate, and is an admixture material uniformly dispersed in spiral blade 114Ca by moving leftward in the axial direction while loosening the admixture material having formed a mass inside casing 113C. To supply.
Agitation plate 114Cb is not limited to this configuration, and may be a spiral blade having a larger pitch than that of spiral blade 114Ca and divided at a predetermined pitch.

The variable-speed drive motor 116C is an electric motor with a reduction gear, and is preferably inverter-controlled to rotationally drive the powder supply screw shaft 114C so as to change its speed.

According to the above-described configuration, even when the mixed material is supplied as a solid, the mixed material is loosened and uniformly dispersed by the stirring plate 114Cb, and the uniformly dispersed mixed material is stably supplied to the spiral blade 114Ca, and the spiral blade 114Ca The mixing material can be confined between the hollow cylindrical tube 115C and the hollow cylindrical tube 115C to supply a supply amount substantially proportional to the rotational speed.

The powder supply unit 11C further includes a powder hopper 118C. The powder hopper 118C is located above the powder feed screw shaft 114C and receives and holds the admixture from above. Preferably, the powder hopper 118C has a rectangular opening at its lower end along the powder feed screw shaft 114C, and is in the shape of a funnel having an upper portion extending in the width direction.

The slurry kneading unit 12C has a slurry kneading shaft 124C and a variable speed drive motor 126C, and is configured to be able to adjust the property of the admixture slurry by the rotational speed of the slurry kneading shaft 124C.

The slurry kneading shaft 124C is rotationally driven by the variable-speed drive motor 126C around the axial center inside the hollow cylindrical casing 123C, and kneading is performed while mixing the admixture and the liquid to continuously produce the admixture slurry. Do.
In this figure, a slurry kneading shaft 124C connects a plurality of inclined plates 124Ca which move the admixture material slurry in the axial direction while mixing admixtures and liquid, and an outer peripheral portion of adjacent two inclined plates 124Ca. And a plurality of kneading plates 124Cb extending in the direction.
The inclined plate 124Ca is a radially extending rectangular inclined plate, and is adapted to move the admixture slurry in the axial direction (leftward in the drawing) while mixing the admixture and the liquid on its inclined surface. In addition, the kneading plate 124Cb is a flat plate extending in the axial direction, and promotes kneading of the admixture slurry to obtain the necessary admixture slurry properties.

Further, the hollow cylindrical casing 123C is connected to the lower end on the outlet side of the casing 113C of the powder supply section 11C via a swing shaft 122C. Moreover, it has a fixing bracket (not shown) which fixes casing 123C in the inclined state.
With this configuration, the axis of the slurry kneading shaft 124C can be variably adjusted within a range of about ± 30 degrees with respect to the horizontal.
The axis of the slurry kneading shaft 124C is about 30 degrees from horizontal so that the slurry kneading shaft 124C is low on the supply side of the admixture (right in the figure) and high on the outlet side of the admixture slurry (left in the figure). By adjusting in the range, even when the rotational speed of the slurry kneading shaft 124C is the same, the moving speed and the discharging speed of the admixture slurry can be adjusted by the inclination angle.
Conversely, by lowering the outlet side (left side in the figure) of the admixture slurry, it is possible to increase the moving speed and discharging speed of the mortar, and to facilitate drainage when the inside is cleaned.

The variable-speed drive motor 126C is a motor with a reduction gear, and is preferably inverter-controlled to rotationally drive the slurry kneading shaft 124C so as to change its speed.

Even when the supply amount of the admixture supplied from the powder supply unit 11C is changed according to the construction scale to be applied, the adjustment of the rotation speed of the slurry kneading unit 12C, and the slurry kneading shaft 124C By adjusting the inclination angle, it is possible to adjust the properties of the admixture slurry in accordance with the feed of the admixture.

The mortar continuous kneading apparatus 10C can produce a uniform admixture slurry from admixtures and liquids in a short time by having the above-described configuration.

The above-mentioned slurry production apparatus and the above-mentioned mortar continuous kneading apparatus are preferable as a slurry production means, and the above-mentioned slurry production apparatus is more preferable. However, the slurry production means is not limited to the above-mentioned slurry production apparatus and the above-mentioned mortar continuous kneading apparatus, as long as a homogeneous admixture material slurry can be produced in a short time from the admixture material and liquid. For example, a drum gravity mixer, a tilting cylinder gravity mixer, a pan type forced mixer and a pug mill type forced mixer can be used as the slurry producing means.

A commercially available mixer can be used as a slurry production means used by the mixture production system in one embodiment of the present invention. For example, a grout mixer "OKZ-30" (model number), a grout mixer "OKZ-50N" (model number), a grout mixer "OKZ-100N" (model number), and a grout mixer "OKZ-150N" (manufactured by Okasan Kiko Co., Ltd.) Model number etc. can be used as a slurry production means.

To the extent that the effect of the mixture generation system in one embodiment of the present invention is not impaired, the slurry produced by the mixture generation system in one embodiment of the present invention may contain materials other than the admixture material and the liquid.
In addition, the slurry manufactured by the mixture production system in one embodiment of the present invention preferably excludes concrete, mortar and cement paste.

(Mixture supply means)
The admixture material supply means 20 supplies the admixture material 2 to the slurry production means 10. The admixture material supply means 20 is, for example, the admixture material supply device 20 shown in FIG. The admixture supply device 20 will be described in more detail with reference to FIG. For example, the admixture feed device 20 includes a powder feed screw shaft 24 rotationally driven about an axial center and feeding the admixture in the axial direction, and a variable speed drive motor rotatably driving the powder feed screw shaft 24 in a variable manner. And adjust the feed rate of the admixture by the rotation speed.

The powder feed screw shaft 24 is rotationally driven by the variable-speed drive motor 26 about an axial center inside the hollow cylindrical casing 23 to feed (move) the admixture material in the axial direction.
The powder feed screw shaft 24 has a spiral blade 24a. The spiral blade 24a is a continuous spiral blade with three or more pitches, and is supplied to the left in the axial direction.
The variable speed drive motor 26 is an electric motor with a reduction gear, and is preferably inverter-controlled to rotationally drive the powder supply screw shaft 24 so as to change its speed.

The admixture feed system 20 further comprises a powder hopper 28. A powder hopper 28 is located above the powder feed screw shaft 24 and receives and holds the admixture from above. Preferably, the powder hopper 28 has a rectangular opening at its lower end along the powder feed screw shaft 24 and is in the shape of a funnel which is spread in the width direction at the top.
The hopper 28 has an internal volume of, for example, 100 kg or more, and in a state where the large flexible container 4 (for example, ton pack) is lifted, the lower end is opened so that a large amount of admixture material can be replenished in a batch from the top. It has become. The capacity of the hopper 28 can be selected according to the application.

The admixture supply device 20 has a admixture supply rate higher than the maximum processing amount of the slurry production means 10, detects the remaining amount of the raw material powder 1 in the slurry production means 10 with a sensor not shown, and turns it on / off. The admixture is intermittently supplied.
The mixed material is discharged from the outlet 29 of the mixed material supply device 20 and supplied to the slurry manufacturing device 10.

The admixture material supply means used in the mixture generation system in one embodiment of the present invention may be the admixture material shown in FIG. 1 or 3 as long as it can supply powdered admixture material to the slurry production means. It is not limited to the supply device 20. For example, a belt feeder capable of conveying powdered admixture, or a pipe capable of circulating powdered admixture can be used as a means for feeding admixture.

(Liquid supply means)
The liquid supply means 30 supplies the liquid 3 to the slurry production means 10. The liquid supply means 30 is, for example, a submersible pump 30 that pumps up the liquid stored in the liquid storage means 31 and sends the pumped liquid to the slurry manufacturing means 10 (see FIG. 1).
The liquid supply means 30 is not limited to the submersible pump as long as the liquid 3 can be supplied to the slurry production means 10. For example, the liquid supply means 30 may be a liquid storage tank provided on the upper side of the slurry production means 10. In this case, gravity is used to supply the liquid from the liquid storage tank to the slurry production means 10, and the amount of liquid supplied to the slurry production means 10 is adjusted using a valve provided in the liquid storage tank.
Further, in order to control the amount of liquid supplied to the slurry production means 10, a flow meter may be provided between the liquid supply means 30 and the slurry production means 10.

(Measure means)
The measuring means 40 measures the supply amount of the admixture 2 and the supply amount of the liquid 3 supplied to the slurry production means 10. The measuring means 40 may be, for example, a load cell 40 for measuring the mass of the admixture and liquid supplied to the slurry producing means 10 (see FIG. 1).
For example, the mass (W1) of the slurry production apparatus 10 before supplying the admixture and the liquid is measured by the load cell 40, and then the mass (W2) of the slurry production apparatus 10 after supplying the admixture is measured by the load cell 40 Do. Thereby, the mass (W2-W1) of the admixture material supplied to the slurry production apparatus 10 can be calculated. Furthermore, the mass (W3) of the slurry production apparatus 10 after supplying the liquid is measured by the load cell 40. Thereby, the mass (W3-W2) of the liquid supplied to the slurry production apparatus 10 can be calculated. Alternatively, the liquid may be supplied first to measure the mass of the slurry production apparatus 10, and then the admixture may be supplied to measure the mass of the slurry production apparatus 10.
Also, the measuring means may measure the mass of the admixture and the liquid, or may measure the volume.
The measuring unit 40 is not limited to the load cell 40 as long as it can measure the supply amount of the admixture and the supply amount of the liquid supplied to the slurry production unit 10. For example, the measuring means is provided between the slurry producing means and the miscible material feeding means, and the measuring tank for measuring the feeding amount of the miscible material and the slurry producing means and the liquid feeding means is provided. It may be a tank.

(Setting means)
The setting unit 51 sets the supply amount of the admixture and the supply amount of the liquid supplied to the slurry production unit 10. The setting means 51 is, for example, a control panel 51 of the control device 50 (see FIG. 1).
The setting unit is not limited to the control panel 51 of the control device 50 as long as the supply amount of the admixture to be supplied to the slurry production unit 10 and the supply amount of the liquid can be set. For example, the setting means may be a setting input device provided separately from the control device 50 for inputting and setting the supply amount of the admixture and the supply amount of the liquid.

(Control means)
The control means 50 mixes the mixed material supplied by the mixed material supply means 20 so that the supply amount of the mixed material 2 to the slurry production means 10 and the supplied amount of the liquid 3 become the set supply amount set by the setting means 50. The supply amount of the material 2 and the supply amount of the liquid 3 supplied by the liquid supply means 30 are controlled. The control means 50 is, for example, the control device 50 shown in FIG. The control device 50 has, for example, a microprocessor and its peripheral circuits, executes a control program stored in the ROM using the RAM as a work area, and performs various controls. The controller 50 controls, for example, the supply amount of the admixture and the supply amount of the liquid as follows.

First, only the liquid is supplied to the slurry production apparatus 10. The flow rate of the liquid to the slurry production apparatus 10 is measured by a flow meter (not shown), and the mass of the liquid supplied to the slurry production apparatus 10 is measured using the load cell 40. This operation is performed by changing the flow rate of the liquid to the slurry production apparatus 10. Then, using the measurement result of the flow rate of the liquid measured by the flow meter and the measurement result of the supply amount of the liquid to the slurry manufacturing apparatus 10 measured by the load cell 40, the flow rate of the liquid measured by the flow meter The relationship with the actual supply amount of liquid supplied to the manufacturing apparatus 10 is examined. That is, calibration of the liquid is performed.

Next, only the admixture material is supplied to the slurry production apparatus 10. Then, the supply amount of the admixture supplied to the slurry manufacturing apparatus 10 is measured using the load cell 40, and the relationship between the inverter frequency of the variable speed drive motor 26 and the supply of the admixture supplied to the slurry manufacturing apparatus 10 Examine. That is, calibration of the admixture is performed.

Then, the control device 50 controls the amount by which the liquid in the submersible pump 30 is pumped up so that the flow rate of the liquid measured by the flow meter becomes the flow rate corresponding to the set supply amount set by the setting means 50. Furthermore, the controller 50 controls the inverter frequency of the variable-speed drive motor 26 so that the inverter frequency of the variable-speed drive motor 26 of the admixture supply device 30 becomes the inverter frequency corresponding to the set supply amount set by the setting unit 50. Control. Thereby, the control device 50 is supplied by the admixture material supply device 20 so that the supply amount of the admixture material to the slurry manufacturing device 10 and the supply amount of the liquid become the set supply amount set by the setting means 50. The feed rate of the admixture and the feed rate of the liquid fed by the submersible pump 30 can be controlled.

As described above, by controlling the supply amount of the mixing material and the supply amount of the liquid, the fluctuation range of the supply amount of the mixing material controlled to be the set supply amount by the control means 50 is 3% by mass or less And preferably less than 2% by weight. Furthermore, the fluctuation range of the liquid supply amount controlled to be the set supply amount by the control means 50 can be 2 mass% or less, preferably 1 mass% or less.

The fluctuation range of the supply amount of the miscible material controlled to be the set supply amount by the control means 50 can be 3% by mass or less, and the liquid controlled to be the set supply amount by the control means 50 The control method of the control means is not limited to the control method by the calibration described above as long as the fluctuation range of the supply amount can be made 2 mass% or less. For example, while actually measuring the supply amount of the mixing material and the supply amount of the liquid, the supply amount of the mixing material and the liquid of the mixing material so that the supply amount of the mixing material and the supply amount of the liquid become the set supply amount. The supply amount may be controlled. In this case, first, only the liquid is supplied to the slurry producing means 10 while measuring the supply amount of the liquid using the measuring means 40, and the supply of the liquid is stopped when the supply amount of the liquid reaches the set supply amount. Next, only the admixture is supplied to the slurry production means 10 while supplying the liquid and measuring the feed of the admixture using the measuring means 40, and when the feed of the admixture reaches the set feed, Stop the supply of admixtures. Then, mixing of the admixture and the liquid is started. In this case, the admixture may be supplied first, and then the liquid may be supplied.

(Pumping means)
The pumping means 60 supplies the admixture material slurry 4 produced by the slurry production means 10 to the pumping hose 61. The pumping means 60 is, for example, a pumping pump 60 (see FIG. 1). The pressure feed pump 60 can supply the slurry produced by the slurry production apparatus 10 to the concrete conveyance means 70 separated by, for example, 50 to 100 m via the pressure feed hose 61. Thereby, even if the distance between the slurry production means 10 and the concrete conveyance means 70 is large, the admixture material slurry produced by the slurry production means 10 can be supplied to the storage and stirring mechanism 71 of the concrete conveyance means 70.

Since the slurry produced by the slurry production apparatus 10 is pressureless or low pressure, the pressure pump 60 needs a pressure capacity sufficient to be supplied to a remote place via the pressure feed hose 61. For example, a known snake pump can be used as the pressure feed pump 60.
The pumping means is not limited to the pumping pump 60 as long as the admixture slurry produced by the slurry production means can be supplied to the pumping hose. For example, the pumping means may be a piston pump or a squeeze pump.

(Concrete transport means)
The concrete transport means 70 has a storage and stirring mechanism 71 for storing and stirring concrete. The concrete transport means 70 is, for example, an agitator car 70 (see FIG. 1). The agitator wheel 70 has a mixer drum 71 for storing and stirring concrete. The mixer drum 71 is internally provided with a spiral blade, and when the mixer drum 71 rotates, the concrete stored in the mixer drum 71 is agitated.
The concrete conveyance means is not limited to the agitator vehicle 70 as long as it has a storage and stirring mechanism 71 for storing and stirring concrete. For example, the concrete transport means may be a track mixer.

As described above, the admixture slurry is supplied to the storage and agitation mechanism 71 through the pressure feed hose 61. Thus, by executing the stirring function of the storage and stirring mechanism 71, the admixture material slurry can be uniformly mixed with the concrete stored in the storage and stirring mechanism 71.

According to the mixture generation system 1 in one embodiment of the present invention, it is preferable that the time from supply of the liquid or admixture to the slurry production means 10 to supply of the admixture slurry to the storage and agitation mechanism 71 is preferably 7 Within minutes, more preferably within 5 minutes. Thereby, after concrete conveyance means arrives at a construction site, time to unloading of concrete can be shortened, and conveyance of concrete can be performed efficiently.

The mixture production system 1 in an embodiment of the present invention can be modified as follows.

(Modification 1)
As shown in FIG. 4, the mixture generation system 1A in the first modification of the mixture generation system 1 according to the embodiment of the present invention includes a retarder water storage unit 150 for storing the retarder water 5 and the retarder water 5. After further discharging the mixture from the concrete conveying means 70, the apparatus further comprises a retarder water pressure feeding means 160 for feeding the agent water pressure feeding hose 161, and then using the delaying agent water pressure feeding means 160, the delaying agent water 5 May be supplied to the storage and agitation mechanism 71, and the storage and agitation mechanism 71 may be cleaned by the retarder water 5. Thus, the storage and agitation mechanism 71 can be cleaned while suppressing the setting of concrete remaining in the storage and agitation mechanism 71, so that the storage and agitation mechanism 71 can be cleaned cleanly. In addition, since cleaning of the storage and stirring mechanism 71 can be started promptly after discharging the concrete from the storage and stirring mechanism 71, the storage and stirring mechanism 71 can be cleanly cleaned also from this point.

<Retardant Water Storage Means>
The retarder water storage means 150 stores the retarder water 5. The retarder water storage means 150 is, for example, a retarder water storage tank 150 (see FIG. 4).
The retarder water storage means is not limited to the retarder water storage tank 150 as long as it can store the retarder water.
Moreover, in order to supply retarder water from retarder water storage means 150 to retarder water pressure feeding means 160 described later, retarder water storage means 150 may be provided with retarder water supply means 151 such as a submersible pump. Good.

<Retardant water>
The retarder water 5 is water containing a retarder. Examples of the retarder used for the retarder water 5 include inorganic retarders and organic retarders. Inorganic retarders, for example, phosphates, silicofluorides, complexes of silicofluorides and phosphates, copper hydroxide, boric acid, zinc oxide, zinc chloride, mixtures of zinc carbonate and lead oxide And mixtures of copper carbonate and urea. Further, organic retarders include, for example, oxycarboxylic acids and salts thereof, ketocarboxylic acids, aldose acids, uronic acids, ketose acids, saccharides, sugar alcohols, cellulose derivatives, water-soluble polymers such as polyvinyl alcohol and the like Etc.

<Retardant pressure feed means>
The retarder water pressure feeding means 160 supplies the retarder water 5 to the retarder water pressure feed hose 161. The retarder water pressure feeding means 160 is, for example, a pressure feeding pump 160 (see FIG. 4). The pressure pump 160 supplies retarder water stored in the retarder water storage tank 150 to the concrete conveyance means 70 separated by, for example, 50 to 100 m via the retarder water pressure feed hose 161. Thereby, even if the distance between the slurry production means 10 and the concrete conveyance means 70 is somewhat large, the storage and stirring mechanism 71 of the concrete conveyance means 70 can be cleaned cleanly.
Since the retarder water stored in the retarder water storage tank 150 is pressureless or low pressure, the pressure pump 160 needs sufficient pressurizing ability to be supplied to a remote place via the pressure hose 161. . Note that, for example, a known snake pump can be used as the pressure feed pump 160.
The retarder water pressure feeding means is not limited to the pressure feed pump 160 as long as the delay agent water stored in the delay agent water storage tank 150 can be supplied to the pressure feed hose. For example, the retarder water pressure delivery means may be a piston pump or a squeeze pump.
Also, the pumping means 60 may be used as the retarder water pressure feeding means 160.

As shown in FIG. 4, a retarder water sprayer 162 may be provided at the end of the pressure-feed hose. As a result, since the retarder water can be vigorously sprayed to the inside of the storage and stirring mechanism 71, the storage and stirring mechanism 71 can be cleaned more cleanly. In addition, the retarder water spray machine 162 mixes the retarder water and compressed air which were supplied from the pumping hose 161 by the nozzle not shown, and injects the mixture of retarder water and compressed air.
Moreover, in FIG. 4, although the human is operating the retarder water spray machine 162, it can also operate mechanically and automatically.

(Modification 2)
As shown in FIG. 5, a mixture generation system 1B according to a second modification of the mixture generation system 1 according to an embodiment of the present invention supplies the liquid storage means 31 for storing liquid and the power for driving the control means 50. In addition, the means other than the concrete conveyance means 70 may be mounted on the same movable carriage 200. Thus, the main means of the mixture generation system 1B can be easily transported, and the flexibility of the mixture generation system 1B can be enhanced.

The moving carriage 200 is a truck 200 in this example, but it may be a trailer or a simple carriage.
In this figure, the movable carriage 200 has thereon slurry producing means 10, admixture material supplying means 20, liquid supply means 30, liquid storage means 31, measuring means 40, control means 50, retarder water storage means 150 and power supply. The means 170 is mounted.
Of the means constituting the mixture generation system, all of the means other than the concrete conveyance means may be mounted on the same movable carriage 200, and of the means constituting the mixture generation system other than the concrete conveyance means A part may be mounted on the same movable carriage 200.

The liquid storage means is not limited to the liquid storage means 31 shown in FIGS. 1 and 5 as long as it can store liquid.
The power supply unit 170 may be a generator or a battery as long as it can supply power for driving the control unit 50.

The above description is merely an example, and the present invention is not limited to the above embodiment.

EXAMPLES The present invention will be more specifically described below with reference to examples and comparative examples, but the present invention is not limited to these.

(Evaluation 1)
The powder and water actually transported in order to confirm the quantitativity at the time of automatically transporting the powder and water to the slurry production apparatus using the mixture generation system 1 according to the embodiment of the present invention shown in FIG. 1 The mass of was measured. In addition, the supply of powder was controlled by detecting the mass of the powder supplied to the slurry manufacturing apparatus using a load cell. Moreover, the supply of water was controlled by detecting the mass of the water supplied to the slurry production apparatus using a load cell. The powders 1 to 8 described below were used as the powder, and normal tap water was used as the water. Each measurement was performed 3 times, the standard deviation was determined, and it was divided by the average of 3 measurements to determine the variation range as a percentage. The results are shown in Table 1. A grout mixer “OKZ-30” (model number) manufactured by Okasan Kiko Co., Ltd. was used as a slurry production means.

<Material used>
(1) Powder 1 to 8
Powder 1: Calcium hydroxide, commercial product, less than 1% of 300 μm residue, 5% of 100 μm residue
Powder 2: Calcium carbonate, commercial product, Blaine specific surface area 4,000 cm ² / g
Powder 3: Alumina cement No. 1 mainly composed of calcium aluminate compound and CaO · Al ₂ O ₃ . Brain specific surface area 5,000 cm ² / g
Powder 4: An expanding material for concrete, which is produced by heat treating a mixture containing a calcium sulfoaluminate compound, CaO raw material and CaSO ₄ raw material, a commercial product, Blaine specific surface area 3,600 cm ² / g
Powder 5: calcium silicate compound, 3CaO · SiO ₂ synthesized from calcium carbonate and SiO ₂ of the reagent first grade. Brain specific surface area 3,000 cm ² / g
Powder 6: Portland cement, commercial product Powder 7: calcium sulfoaluminate cement, commercial product, Blaine specific surface area 4,500 cm ² / g
Powder 8: Blast furnace slag, commercial item

<Mixture supply system>
Inner diameter of casing: 250 mm
Casing length: 2000 mm
Number of helical blade pitches in powder feed screw shaft: 10
Inverter frequency of variable speed drive motor: 60Hz

From Table 1, when the mixture production system 1 according to one embodiment of the present invention is used, the fluctuation range of measured value of powder and liquid supplied to the slurry production apparatus is 2 mass% or less, preferably 1 mass% in liquid. It became as follows, and it became 3 mass% or less with a powder, Preferably it became 2 mass%, and it turned out that quantitative efficiency is securable.

(Evaluation 2)
The slurry is manufactured and manufactured batchwise by changing the time (stirring time) from the supply of powder and liquid using the mixture generation system 1 according to one embodiment of the present invention to the completion of the 20-liter slurry The slurry properties were confirmed. The water powder ratio was 50% in all cases, and the stirring time was 30 seconds, 60 seconds, 90 seconds, and 120 seconds. By passing the stirred slurry through a 5 mm sieve, it was confirmed whether or not a powdery lump not completely dispersed in the slurry was present. The results are shown in Table 2. A grout mixer “OKZ-30” (model number) manufactured by Okasan Kiko Co., Ltd. was used as a slurry production means.

From Table 2, it was found that by using the slurry addition system of the present invention, a slurry without lumps can be produced within 120 seconds regardless of which material is used.

(Evaluation 3)
Slurry was manufactured by a batch system using the mixture production system 1 of one embodiment of the present invention, and after supplying powder to the slurry manufacturing apparatus, the time taken to supply the slurry to the agitator wheel was measured. Powders 1 and 3 were used as the powder, the liquid was tap water, the slurry was 50% in all, and the slurry was manufactured with a stirring time of 120 seconds. The pumping distance was 10 m. The results are shown in Table 3. A grout mixer “OKZ-30” (model number) manufactured by Okasan Kiko Co., Ltd. was used as a slurry production means.

From Table 3, by using the mixture generation system 1 according to the embodiment of the present invention, the slurry can be applied to the agitator car within 5 minutes after supplying the powder to the slurry production apparatus, regardless of which powder is used. It turned out that it can supply.

(Evaluation 4)
Plain concrete of 288 kg / m ³ cement, water / binder ratio 55.0%, air content 4.5 ± 1.5% by volume is prepared in a fresh concrete plant, and 2 m ³ or 4 m for a 5 m ³ agitator vehicle ³ Loaded and transported for 30 minutes. Thereafter, using the mixture generation system 1 according to one embodiment of the present invention, the expansive material of the powder 4 is mixed with water for 90 seconds to have a water-powder ratio of 55% to form a slurry, and the expansive material addition amount is 20 kg / The slurry was supplied to the agitator car to be m ³ . After supplying the slurry, the mixer drum of the agitator car was rotated at high speed for 2 minutes, and then the concrete was discharged. From the concrete in the middle of discharge, immediately after the start of discharge, at the time of discharge of 1/2 of the load of concrete, and at the end of discharge, sampling was performed three times to prepare a concrete sample. The compressive strength (in accordance with JIS A 1108) and the rate of change in length (in accordance with JIS A 6202) were measured for this concrete sample. Further, the surface condition of the hardened concrete was confirmed, and it was confirmed whether the expansive material of the powder 4 was uniformly dispersed in the concrete uniformly by only stirring the mixer drum of the agitator wheel. In addition, in the present test, for comparison, the test was also performed in the case where the expansive material of the powder 4 was added to the agitator car so as to be 20 kg / m ³ as the powder as it is. The concrete prior to the addition of the expansive material was adjusted to be the same water binder as in the case of the slurry addition, and the mixing method after the addition of the expansive material was the same as the case of the slurry addition. The concrete composition of this test is shown in Table 4. Also, the results are shown in Table 5. A grout mixer “OKZ-30” (model number) manufactured by Okasan Kiko Co., Ltd. was used as a slurry production means.

From Table 5, according to the mixture generation system 1 of one embodiment of the present invention, it was found that the powdery admixture can be uniformly mixed with the concrete only by rotating the drum of the agitator wheel. Thereby, according to the mixture generation system 1 of one embodiment of the present invention, it turned out that powdery admixture materials can be efficiently mixed with fresh concrete transported by the agitator car to the construction site. . Furthermore, according to the mixture generation system 1 of one embodiment of the present invention, highly fluid concrete, grout (mortar / concrete), high strength / super high strength concrete, high durability concrete, seawater resistant concrete, acid resistant concrete, It turned out that it is possible to easily manufacture special concrete in which admixture materials such as abrasion resistant concrete, underwater non-separable concrete, mass concrete, reverse cast concrete, shot concrete and porous concrete are mixed.
On the other hand, when the powder is supplied to the agitator as it is without using the mixture generation system 1 according to the embodiment of the present invention, dispersion in concrete is not sufficiently performed, and it is confirmed that the dispersion is partially biased. The As a result, it was found that when the powdery admixture was supplied directly to the agitator wheel, the powdery admixture could not be uniformly mixed with the concrete only by rotating the drum of the agitator wheel. When such concrete is used, it is considered that partial and local failures occur.

1 mixture formation system 2 powdery admixture 3 liquid 4 admixture slurry 5 retarder water 10 slurry production means (slurry production apparatus)
DESCRIPTION OF SYMBOLS 10C Mortar continuous kneading apparatus 11 stirring tank 11C powder supply part 12 rotating shaft 12C slurry kneading part 13 drive device 14 stirring blade 15 belt 16 discharge port 17 discharge port lid 18 discharge chute 20 admixture material supply means (mixture material supply device)
23 casing 24 powder supply screw shaft 24a spiral blade 26 variable speed drive motor 28 hopper 30 liquid supply means (submersible pump)
31 Liquid storage means 40 Measuring means (load cell)
50 Setting means, control means (control device)
51 Setting means (control board)
60 pumping means (pressure pump)
61 Pumping hose 70 Concrete transportation means (agitator car)
71 Storage and stirring mechanism (mixer drum)
113C casing 114C powder feed screw shaft 114Ca spiral blade 114Cb stirring plate 115C hollow cylindrical tube 116C variable speed drive motor 118C powder hopper 121 stirring blade side pulley 122C swinging shaft 123C casing 124C slurry kneading shaft 124Ca inclined plate 124Cb kneading plate 126C possible Variable speed drive motor 131 Drive device side pulley 141 Center portion 142 Stirring blade 143 Material passing portion 144 Auxiliary wing portion 150 Retardant water storage means (Retardant water storage tank)
160 Retardant Water Pressure Delivery Means 161 Retardant Water Pressure Delivery Hose 162 Retardant Water Sprayer 170 Power Supply Means 200 Moving Truck

Claims

Slurry production means for producing a slurry of admixture from powdered admixture and liquid;
Admixture material supply means for supplying the admixture material to the slurry production means;
Liquid supply means for supplying the liquid to the slurry production means;
Measuring means for measuring the supply amount of the admixture and the supply amount of the liquid supplied to the slurry production means;
Setting means for setting the supply amount of the admixture and the supply amount of the liquid supplied to the slurry production means;
The feed rate of the admixture material supplied by the admixture feed means such that the feed rate of the admixture material to the slurry production means and the feed rate of the liquid become the set feed rates set by the setting means. And control means for controlling the supply amount of the liquid supplied by the liquid supply means;
A feeding means for feeding the mixing material slurry produced by the slurry production means to a pressure delivery hose;
It has concrete transport means with storage and stirring mechanism to store and stir concrete,
The fluctuation range of the supply amount of the admixture which is controlled to the set supply amount by the control means is 3 mass% or less, and the supply amount of the liquid controlled to the set supply amount by the control means The fluctuation range of 2% by mass or less, and the admixture slurry is supplied to the storage / stirring mechanism through the pumping hose, to form a mixture of the concrete and the admixture slurry. system.
The system for producing a mixture according to claim 1, wherein the time for supplying the admixture and the liquid to completing the admixture slurry is within 120 seconds.
3. The mixture generation system according to claim 1, wherein a time from supplying the admixture with the slurry production means to feeding the admixture slurry into the storage and stirring mechanism is within 7 minutes.
Retarder water storage means for storing retarder water;
The retarder water pressure feeding hose further includes a retarder water pressure feeding means for feeding the retarder water to the pressure-retarding agent hydraulic hose
After the mixture is discharged from the concrete transport means, the retarder water is supplied to the storage and agitation mechanism through the retarder hydraulic feed hose using the retarder hydraulic feed means,
The mixture producing system according to any one of claims 1 to 3, wherein the storage and stirring mechanism is washed with the retarder water.
Liquid storage means for storing the liquid;
It further comprises power supply means for supplying power for driving the control means,
The mixture generation system according to any one of claims 1 to 4, wherein the means other than the concrete transfer means is mounted on the same movable carriage.
The mixture generation system according to any one of claims 1 to 5, wherein the concrete conveyance means is an agitator.
The mixing material supply means includes a powder supply screw shaft that is rotationally driven about an axial center and supplies the mixing material in the axial direction, and a variable speed drive motor that rotatably drives the powder supply screw shaft. The mixture generation system according to any one of claims 1 to 6, wherein the supply amount of the admixture is adjusted by the rotation speed thereof.
The slurry production means includes a stirring tank, a rotary shaft provided at the bottom of the stirring tank and extending vertically in the stirring tank, and a stirring blade attached to the rotary shaft.
The stirring blade includes a central portion connected to the rotation shaft, and a plurality of stirring blades extending radially outward from the central portion,
The stirring blade extends radially outward from the periphery of the central portion,
The front end of the agitating blade is provided obliquely so that it is higher than the rear end,
A material passage portion is formed by providing the stirring blades with an interval between the adjacent stirring blades.
The auxiliary wing portion is fixed to the radial tip end of the stirring blade,
The auxiliary wing portion has an annular shape or a flat plate shape obtained by dividing an annular shape, and is provided on the outer side of the material passing portion with respect to the inner and outer directions of the rotation diameter, and The mixture generation system according to any one of claims 1 to 7, comprising a portion located radially outward of the radial tip.
The admixture is a group consisting of fly ash, ground granulated blast-furnace slag, silica fume, expansive agent, quick-hardened wood, quick-set wood, admixture for high strength, limestone fine powder, crushed stone powder, sludge powder and sewage sludge fine powder. The mixture generation system according to any one of claims 1 to 8, which is at least one admixture selected from the group consisting of