JPH08319485A - Equipment for producing suspension - Google Patents

Abstract

PURPOSE: To obtain a suspension grout excellent in penetration and giving a high efficiency of injection. CONSTITUTION: Equipment for producing a suspension grout by dispersing a powder composed mainly of cement in water, which is provided with an ultrasonic generator and/or a vibrator for imparting vibration to a liquid S in a mixer 4 serving to mix the powder with water or a liquid discharged from the mixer to disintegrate the agglomerated mass of the powder. The formation of coarse particles comprising the agglomerated mass can be prevented by the forced dispersion by means of the ultrasonic generator and/or the vibrator. Because of an excellent penetration, the produced grout can be readily injected and effectively penetrated into the fine cracks and gaps of soft grounds, rock beds and concentrates into which conventional suspension grouts could not be injected, so that it is possible to strengthen and improve these grounds, rock beds and concretes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension manufacturing apparatus, and more particularly to a suspension used for filling cracks and voids for improving soft ground, preventing spring water, and strengthening rock and concrete. The present invention relates to an apparatus for producing a suspension suitable for producing a turbid grout.

[0002]

2. Description of the Related Art Conventionally, in order to improve soft ground, prevent spring water, and strengthen rock and concrete, injection of grout to fill cracks and voids with suspension grout in which cement powder is dispersed in water The construction method is applied. The grout used in this grout pouring method is generally a suspension prepared by dispersing mixed powder of Portland cement, clay mineral, blast furnace slag, fly ash, etc. in water.

Conventionally, the mixed powder for grout is mixed and dispersed in a predetermined amount of water by a mixer to produce a suspension grout. The mixer used for the production of this suspension grout includes a grout mixer and a pump incorporated in one, or a mixer such as a jet mixer or a Kanifu mixer that also serves as a pump. In the grout mixer, a rotary shaft having a rotary blade is attached to a tank, and the grout is kneaded by a vortex generated by the rotary blade and convection in the tank. There are various types of mixer blades such as paddle type, turbine type, and propeller type. Also,
Depending on the number and arrangement of tanks, there are types such as a single tank type, a horizontal two tank type, a multi-tank type, and an upper and lower two tank type.

[0004]

By the way, when pouring grout into cracks in concrete or voids in the ground, in order to easily inject grout, dispersed particles in the grout pass through pores of soil particles or cracks. It is necessary to have a particle size of a size that is easy to do.

However, in the suspension grout obtained by dispersing the mixed powder of Portland cement, clay mineral, etc., which has been conventionally used for grout, in water with the above mixer, in a state of being suspended in water, Actually, the powder particles are aggregated with each other to form a large particle mass. The particle size of each powder used in the grout is measured in a state close to complete dispersion, so the number of coarse particles is small, but in a suspension type grout in which this is dispersed in water, the powder aggregates. Then, a large amount of coarse particle aggregates are generated.

Therefore, in the conventional suspension type grout, the aggregates are collected in the flow passages such as cracks and voids near the injection port, and the flow passage width sudden change portion is clogged. As a result, grout often cannot penetrate into the inside. For this reason, conventionally, it was not possible to inject the suspension grout into the fine-grained sandstone layer, and it was not possible to improve the ground or strengthen the bedrock, so that it was often the case that the subsequent work could not be undertaken. By the way, in the conventional method for producing suspension-type grout, even if it is stirred with a high-speed rotating mixer, the particle aggregates formed by the agglomeration of the powder in the grout do not loosen, and agglomerated coarse particles remain, so that the fine sandstone It could not be injected into quality rock.

Generally, the maximum particle size of cement used for pouring grout is said to be 1/3 of the crack width and about 1/10 of the particle size of the formation. As described above, the width of the interval in which the grout permeates is set to be extremely larger than the maximum particle diameter of the cement, mainly because this aggregate particle aggregate is generated.

Therefore, it can be said that if the large-sized aggregate is loosened, the permeability of the grout into the narrow space is improved.

The present invention has been made in view of the above-mentioned conventional circumstances, and it is possible to obtain a strong dispersion promoting action for loosening agglomerated agglomerates of powder, and therefore excellent permeability and injection efficiency. An object of the present invention is to provide an apparatus for producing a suspension capable of easily producing a highly suspended grout.

[0010]

According to a first aspect of the present invention, there is provided an apparatus for producing a suspension in which a powder is dispersed in water, and a mixer for stirring and mixing the powder and water. When,
The liquid in the mixer or the liquid discharged from the mixer is provided with an ultrasonic transmitter and / or a vibrator for imparting vibration for loosening agglomerates of powder.

An apparatus for producing a suspension according to a second aspect is the apparatus according to the first aspect.
In the above device, a powder containing cement as a main component is dispersed in water to produce a suspension grout.

An apparatus for producing a suspension according to a third aspect is the apparatus according to the first aspect.
Alternatively, in the apparatus of Item 2, the vibrator is provided in the mixer.

An apparatus for producing a suspension according to a fourth aspect is the apparatus according to the first aspect.
In the device according to any one of items 1 to 3, the ultrasonic transmitter is attached to the mixer.

An apparatus for producing a suspension according to a fifth aspect is the apparatus according to the first aspect.
The apparatus according to any one of items 1 to 4 is characterized in that it is provided with a tank for holding the liquid discharged from the mixer, and the tank is provided with an ultrasonic transmitter and / or a vibrator.

That is, the inventors of the present invention have conducted extensive studies to loosen agglomerated particles of the grout powder to produce a suspension grout having excellent permeability and injection efficiency. If vibration is applied with an ultrasonic transmitter or vibrator at the time of manufacturing, the agglomerates of cement-based powder will be loosened,
It was found that the coarse particles disappear and the permeability of grout is dramatically improved. At that time, if a surfactant that promotes the dispersion of the powder in the grout is used, it becomes easier to loosen the agglomerated powder, and the injection amount is increased and the permeability is further improved. I found that I can do it.

The present invention has been completed based on the above findings.

The present invention will be described in detail below.

In the following, the case of producing a suspension grout by the suspension production apparatus of the present invention will be mainly described, but the present invention is not limited to the suspension grout.
It is also effective for the production of suspensions such as slurry, mortar and cement paste that constitutes concrete.

The gist of the present invention is to disperse the powder for grout in water to produce a suspension, and to loosen the agglomerates of the powder particles, the powder of the conventional rotary blade is used. It is characterized in that a vibration stronger than the dispersion action is applied to the ultrasonic transmitter and / or the vibrator.

In the present invention, these vibrations are applied during and / or after stirring by the rotary blades, since high dispersion efficiency can be obtained. Therefore, the ultrasonic transmitter and /
Alternatively, the vibrator is installed at one or more places such as a mixer, a buffer tank after the mixer, an agitator tank, a pipe, and an injection machine such as an injection pump.

Generally, an ultrasonic transmitter is more suitable for the present invention than an oscillator because it can eliminate agglomerates of powder in a short time. Generally, the larger the output of a vibrator or ultrasonic oscillator, the higher the frequency or frequency, the greater the dispersion effect, but the size of the device, the amount and temperature of grout, the type and amount of surfactant that promotes dispersion. Optimal conditions vary depending on the situation. The optimum conditions are conditions under which the reduction rate of aggregates in the grout is maximized, and can be determined using a particle size analyzer. As an example of the conditions, when vibration is applied by the ultrasonic transmitter, the output is 100 to 2
An ultrasonic transmitter of about 000 W may be used. In addition, when vibration is applied with a vibrator, the frequency of vibration is 50
It is preferable to use a vibrator of about 00 to 15000 vpm.

[0022]

By performing the forced dispersion treatment by the vibration of the ultrasonic transmitter or the vibrator, the coarse particles of the agglomerates of the powder produced in a large amount in the dispersion system are effectively loosened and disappear. As a result, a large amount and smooth penetration of grout into suspension-type grouts using fine-grained cements and fine sandstone rocks and ground that could not be injected due to the presence of coarse particles in agglomerates. Like Furthermore, since the bubbles in the grout are reduced, the filling property of the grout after permeation becomes good.

The apparatus of the present invention is particularly effective for producing cement milk-based grout, and is also effective for improving the separation resistance of grout.

In addition, by using a surfactant that promotes dispersion during the dispersion treatment, it becomes possible to more effectively loosen the agglomerated powder, so that the amount of the grout to be injected can be increased. Although it is possible to increase and improve the duration of permeation, as described above, when a surfactant for improving dispersibility is used in combination, the amount of use can be reduced by applying vibration with the device of the present invention. It is possible to obtain a more excellent improving effect with a small amount of the surfactant used.

[0025]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 are system diagrams showing an embodiment of an apparatus for producing a suspension of the present invention.

The suspension manufacturing apparatus shown in FIG. 1 is an apparatus in which an ultrasonic transmitter is attached to a mixer conventionally used for manufacturing suspension grout, and a grout powder is stored in a tank 1. The ultrasonic wave transmitter 5 is attached to the bottom of the tank 1 of the mixer 4 in which the water and the water are stirred by the rotation of the stirring blade 3 by the motor 2 so that the liquid S in the tank 1 is vibrated by the ultrasonic waves. It is the one. With or without stirring by the stirring blade 3, the suspension grout manufactured by performing high dispersion treatment by vibration by ultrasonic waves transmitted from the ultrasonic transmitter 5 is extracted from the pipe 6 and injected. It is injected into the construction target by the pump 7.

The apparatus for producing a suspension shown in FIG. 2 is provided with a grout storage tank 8 below the mixer 4, a rod-shaped vibrator 9 is inserted in the mixer 4, and an ultrasonic transmitter 5 is installed in the storage tank 8. Is provided so that the liquids S and S ′ in the tanks 1 and 8 are respectively vibrated by the vibrator 9 and the ultrasonic transmitter 5. 2, members having the same functions as those in FIG. 1 are designated by the same reference numerals.

In the suspension manufacturing apparatus of this embodiment, the liquid S in the tank 1 is subjected to high dispersion treatment by vibrating the liquid S in the tank 1 during or after the stirring. The liquid S is withdrawn from the pipe 10 equipped with the valve 10A and stored in the lower storage tank 8, and the liquid S ′ is vibrated by the ultrasonic transmitter 5 in the storage tank 8 as well. Highly dispersed processing is performed.

The suspension grout thus produced by the high dispersion treatment by the vibration of the vibrator 9 and the ultrasonic transmitter 5 is extracted from the pipe 6 and injected into the construction object by the injection pump 7. .

According to such a suspension production apparatus of the present invention, vibration is imparted by an ultrasonic transmitter and / or a vibrator during and / or after stirring by a mixer, so that the dispersibility is remarkably excellent. Suspension grout can be efficiently produced.

The apparatus for producing a suspension of the present invention only needs to be equipped with an ultrasonic transmitter and / or a vibrator in an existing mixer or tank, and is very easily applicable to existing equipment.

[0033]

As described in detail above, according to the apparatus for producing a suspension of the present invention, when the powder is dispersed in water to produce a suspension, the agglomerates of the powder particles are effective. By disintegrating, it is possible to prevent the formation of coarse particles and form a suspension having extremely good uniform dispersibility.

The suspension production apparatus of the present invention is particularly effective for producing a suspension-type grout by dispersing cement-based powder in water, and produces coarse particles in which powder particles are aggregated. Therefore, it is possible to produce a suspension grout having excellent permeability and high injection efficiency. The suspension-type grout produced by the device of the present invention has excellent permeability, so that it can be easily injected into soft ground, fine cracks and voids in rock or concrete that could not be injected with the conventional suspension-type grout. It is possible to effectively infiltrate the ground, rock, and concrete, and strengthen and improve them.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of an apparatus for producing a suspension of the present invention.

FIG. 2 is a system diagram showing another embodiment of the suspension manufacturing apparatus of the present invention.

[Explanation of symbols]

 1 Tank 2 Motor 3 Stirring Blade 4 Mixer 5 Ultrasonic Transmitter 7 Injection Pump 8 Storage Tank 9 Vibrator

Claims (5)

[Claims] 1. A device for producing a suspension by dispersing powder in water, wherein a mixer for stirring and mixing the powder and water, and a liquid in the mixer or a liquid discharged from the mixer, An apparatus for producing a suspension, comprising: an ultrasonic transmitter and / or a vibrator that imparts vibration for loosening agglomerates of powder. 2. The apparatus for producing a suspension according to claim 1, which is an apparatus for producing a suspension grout by dispersing powder having cement as a main component in water. 3. The apparatus for producing a suspension according to claim 1, wherein a vibrator is provided inside the mixer. 4. The apparatus for producing a suspension according to claim 1, wherein an ultrasonic transmitter is attached to the mixer. 5. The apparatus according to claim 1, further comprising a tank for holding the liquid discharged from the mixer, wherein the tank is provided with an ultrasonic transmitter and / or a vibrator. Characteristic suspension manufacturing equipment.