JP2007191920A - Method for mixing/agitating/injecting a plurality of fluids - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for mixing/agitating/injecting a plurality of fluids capable of continuously carrying out mixing/agitation/injection within a continuous line while carrying out mixing and agitation corresponding to various kinds of prescriptions by combining a plurality of suction pumps, flow regulators and an agitating injection pump. <P>SOLUTION: The device for mixing/agitating/injecting the plurality of fluids is constituted to suck the plurality of fluids by the suction pumps 1, 5, to regulate the respective flow rates by the flow regulators to force-feed the fluids to the agitating injection pump 3, to agitate and mix the plurality of fluids at a required mixing rate by the agitating injection pump 3 and then to force-feed an agitated and mixed fluid in a one-liquid state from the agitating injection pump 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an integrated apparatus for preparing, stirring and injecting a plurality of fluids, and in particular, large gaps and cavities in soft ground, crush zones and cracks (gap) in hard ground such as rock, ground and structure Non-flowable plastic grout that fills the gaps created at the time of installation of injection pipes and cavities on the boundary surface of objects (including the back of tunnels, etc.) and weak grounds (injected as pretreatment for ground injection) The present invention relates to a multiple fluid preparation / stirring / injection apparatus suitable for injecting a liquid.

Conventionally, one-component mortar (main component cement) has been used as a grout for filling large cavities and gaps.

This mortar contains sand, primary mineral fine powder (rock, quartz, etc.) as an aggregate (or filler) added to cement due to the size of the cavity, workability (pumping distance and injection conditions), and grout characteristics (strength, etc.). Lime, dolomite, etc.), clay minerals (bentonite, porcelain clay, etc.) and on-site generated soil (silt, clay) etc. are used, and one or more of these aggregates are used in combination. A foaming agent (air mortar), a dispersing agent, a retarder, an early-strength developing material, and the like are added according to the purpose.

All of the conventional mortar injections are one-part (a method in which mortar is prepared at once in a preparation tank and then injected with a single pump). Sufficient fluidity must be maintained, resulting in breathing (excess water), and it takes a long time (2 to 3 hours) to harden the cement. Will be left untouched.

For this reason, the injected mortar (grout) causes breathing after filling, and its volume is reduced. Further, since it is in a fluid state, there is a problem that uniform strength cannot be obtained due to material separation.

In addition, when there is groundwater at the injection site, there is a problem that the grout material is diluted with water and washed away. It includes a fatal problem that it cannot be filled.

In order to solve such a problem, a technique shown in Patent Document 1 has been proposed as a technique that can reliably fill a predetermined cavity without causing breathing or material separation of the mortar.

Japanese Patent No. 3514614

  This technology is a grout material that fills cavities and gaps in the ground, structures, or the interface between the ground and the structure, and contains montmorillonite clay mineral in a fluid mortar mainly composed of hardened material. This is a plastic grout injection method in which the swelling liquid is gelled and transformed into a non-flowable plastic by adding a fluid swelling liquid.

In other words, the above-mentioned conventional technology is mainly composed of a hardened material such as cement, and a flowable mortar in which various aggregates and additives are added to montmorillonite clay mineral (a typical mineral is bentonite. By adding a fluid swelling liquid containing hereafter, bentonite), electrolyte ions such as alkaline calcium ions (cations) dissolved from the cured material are adsorbed on the surface of bentonite particles (negatively charged), Due to the electrochemical action (charge substitution), the bentonite swelling liquid undergoes a kind of gelation reaction, and its viscosity rapidly increases (short time, close to the moment) and loses its fluidity, resulting in a non-flowable plastic grout. It changes to.

As a result, this grout material also prevents breathing, material separation, water dilution and volume shrinkage, and prevents unnecessary faraway escapes to ensure that the desired cavity is filled and limited injection. Is possible.

Bentonite is a montmorillonite clay mineral as a main component, and its property is that it swells and disperses remarkably when it comes into contact with water, and it becomes a colloid (particle size 0.001 to 0.01 micron) and the viscosity increases remarkably.

For this reason, the greater the swelling ability of bentonite, the greater the gelling ability of the hardening-expressing material that also exhibits alkalinity, such as cement, and the greater the effect of transforming into a plastic state.

To add a swollen bentonite liquid (B liquid) to a one-part fluid mortar (A liquid) and transform it into a non-flowable plastic grout (the strength of the plastic grout), the water in the A liquid It is influenced by the type and amount of the hardening developing material, the aggregate and the additive, the type and amount of bentonite (Liquid B), and the degree of swelling.

Among these, what particularly affects the first is the degree of swelling and the amount of bentonite, and the second is the amount of water contained in the grout (A + B solution).

From the above, since whether or not it can be transformed into a non-flowable plastic grout varies greatly depending on the conditions of the A and B liquids, there is a problem that the alteration conditions cannot be specified depending on the content of bentonite. It was.

In this specification, the plastic grout is a non-fluid material that does not flow by itself, but easily fluidizes when a physical action (for example, pressurization or weighting) is applied.

The present invention was devised in view of the present situation, and the object of the present invention is to mix and agitate to various prescriptions by combining a plurality of suction pumps, flow control devices and agitation injection pumps. An object of the present invention is to provide a multi-fluid mixing / stirring / injecting apparatus capable of continuously performing mixing / stirring / injection in a continuous line.

  In order to achieve the above object, the multiple fluid mixing / stirring / injecting apparatus according to claim 1 is characterized in that the mixed fluid is mixed with a ground, a structure, a cavity at a boundary between the ground and the structure, The grout material to be injected into the gap, and the plurality of fluids constituting the grout material include a fluid mortar mainly composed of a hardening developing material and a fluid swelling liquid containing a montmorillonite clay mineral. The mortar and the swelling liquid are sucked by separate suction pumps, and their flow rates are adjusted via a flow rate control device provided in the flow paths of the mortar and the swelling liquid, and are pumped to the stirring injection pump. The grout material that has been mixed with stirring and mixed at the required mixing ratio by the stirring injection pump and then gelled and transformed into a non-flowable plastic is pumped in a single liquid state to the vicinity of the injection port. It is characterized by that.

Further, the multiple fluid preparation / stirring / injection device according to claim 2 is a preferred embodiment of the invention of claim 1, and the stirred and mixed fluid is a ground, a structure, a ground and a structure. It is a grout material that is injected into cavities and gaps in the boundary surface of objects, and the plurality of fluids constituting the grout material are fluid mortars mainly composed of hardened materials and fluids containing montmorillonite clay minerals. The mortar and the swelling liquid are sucked by separate suction pumps, and the flow rates thereof are adjusted via flow rate control devices provided in the flow paths of the mortar and the swelling liquid. The mixture is pumped to the stirring injection pump, mixed and mixed at the required mixing ratio by the stirring injection pump, and then the grout material that has been gelled and transformed into a non-flowable plastic is in a one-liquid state up to the vicinity of the injection port. It is characterized by pumping.

Furthermore, the invention described in claim 3 is based on the technical premise of the multi-fluid mixing / stirring / injecting device described in claim 1 or 2, and changes one liquid into a plastic form. The liquid material is characterized by the presence of an inorganic material such as sodium silicate, aluminum sulfate, slurry for producing ettringite.

  The invention according to claim 1 is that the agitated and mixed fluid is a ground material, a structure, and a grout material that is injected into a cavity or a gap in a boundary surface between the ground and the structure, and a plurality of the grout materials The fluid is composed of a fluid mortar mainly composed of a hardened material and a fluid swelling liquid containing montmorillonite clay mineral. The mortar and the swelling liquid are sucked by separate suction pumps. The flow rate of the mortar and the swelling liquid is adjusted through a flow rate control device, and the flow rate is adjusted and pumped to the stirring injection pump. The composition is characterized in that the grout material that has been gelled and transformed into a non-flowable plastic is pumped in one liquid state to the vicinity of the inlet, so the mixing ratio of each fluid is greatly different. , Mixing accuracy is required If the viscosity of a plurality of fluids is high and difficult to mix, the viscosity of a plurality of fluids is high and difficult to mix, and it is difficult to inject, or a complicated formulation requiring two or more liquid preparations is required. Even when necessary, preparation, stirring, and injection can be continuously performed in a continuous line while preparing and stirring for various prescriptions.

  Further, the invention according to claim 2 is characterized by adding a flowable bentonite swelling liquid to a flowable mortar to gel the swelling liquid and transforming it into a non-flowable plastic grout, thereby allowing breathing and material separation. In addition, it is possible to prevent the dilution of water and to prevent unnecessary escape, and to fill the cavity surely.

That is, in the invention described in claim 2, a fluid containing montmorillonite clay mineral in a one-part fluid mortar in which a hardening developing material is a main component and various aggregates and additives are added thereto. By adding a water-soluble swelling liquid, the bentonite swelling liquid is such that electrolyte ions such as alkaline calcium ions (cations) dissolved from a hardening developing material such as cement are adsorbed on the surface of bentonite particles (negatively charged). Due to electrochemical action (charge substitution), a kind of gelation reaction occurs, the viscosity increases rapidly (short time), loses fluidity, changes to non-flowable plastic grout, and breathing In addition, while preventing material separation and dilution of water, it is possible to prevent unnecessary escape and to fill the target cavity in a single liquid state.

As a result, this non-flowable plastic grout is very effective as limited injection. In addition, the swelling liquid used for the other liquid of the present invention is mainly composed of montmorillonite clay mineral, and typical examples thereof include bentonite. As the liquid material, there are inorganic materials such as sodium silicate, aluminum sulfate, slurry for producing ettringite and the like.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing a schematic configuration of a blending / stirring / injecting apparatus when a plurality of fluids according to an embodiment of the present invention are liquid A and liquid B. FIG.

As shown in the figure, the A liquid is sucked by the A liquid blending injection pump 1 through the suction hose 2 and injected into the stirring injection pump 3, and the B liquid is supplied through the suction hose 4. The liquid B is sucked by the blending injection pump 5 and injected independently into the stirring injection pump 3. Therefore, mixing and stirring suitable for various prescriptions can be performed by adjusting the flow rate through the flow rate adjusting devices 6 and 7 interposed in the middle of the pumps 1 and 5. In addition, as the A liquid preparation and injection pump 1 and the B liquid preparation and injection pump 5, a known tube type pump can be used, and the flow rate adjusting devices 6 and 7 are also known flow rate adjustments using known electromagnetic valves. A device (such as an electromagnetic flow meter) can be used.

The stirring and injection pump 3 mixes and stirs the liquid A and the liquid B sent from the pumps 1 and 5 and then pumps them to the injection port in the state of one liquid. This agitating / injecting pump 3 is suitable for materials by varying the agitation speed according to the pumping amount of the A liquid and B liquid from the pumps 1 and 5 to prevent excessive agitation mixing and insufficient agitation. It is configured to create a mixed state. Of course, it has the function which can ensure the injection | pouring pressure which pumps the fluid which became 1 liquid by stirring and mixing to an injection port. In addition, the agitation pump 3 is configured so as not to cause a pressure load when the maximum total amount of the plurality of fluids passes through and is agitated. A pressure transmitter 8 is disposed near the entrance of the stirring / injecting pump, and is configured to be able to monitor the fluid pressure of the A and B liquids flowing into the stirring / injecting pump 3.

Next, the case where the plastic grout is applied with the above apparatus will be described. The liquid A is a fluid mortar mainly composed of a hardening developing material, and the fluid swelling liquid containing bentonite is a liquid B. Pumped by separate pumps 1, 5, the flow rate is adjusted by flow rate adjusting devices 6, 7 interposed in the middle of these pumps 1, 5, carried into the stirring injection pump 3, and the stirring injection pump 3 Then, the swollen liquid of the liquid B is gelled by injecting and mixing the liquids A and B, and one liquid grout that has been transformed into a non-flowable plastic is injected.

The curing expression material used for the liquid A (mortar) of this example is a hardly soluble alkaline substance, which is cured when mixed with water. Typical examples are cement, cement and slag, slag and lime (slaked lime, quick lime). ) Etc.

Further, as aggregate (or extender) to be added to the liquid A of this example, sand, fly ash, lime, primary mineral fine powder (rock, quartz, limestone, dolomite, etc.), clay mineral (bentonite, porcelain earth, etc.) , Soil generated on the site (silt, clay-containing soil, shield mud, etc.) and the like, and one or more of these aggregates can be combined.

Furthermore, the foaming agent (foaming agent etc.), the dispersing agent, the retarder, the early strength developing material, etc. which are added to the conventional mortar can be added according to the purpose.

Moreover, the swelling liquid used for B liquid of a present Example has a montmorillonite clay mineral as a main component, and can mention a bentonite as a typical thing. In addition, as the B liquid material for changing the A liquid into a plastic form, there are inorganic materials such as sodium silicate, aluminum sulfate, and a slurry for producing ettringite.

In the injection of the space in the structure and the cavity at the boundary between the structure and the ground (including the back of the tunnel, etc.), the fluidity that has been pumped by the stirring injection pump 3 to the front of the grout hole provided at the target location. 1 liquid (grouting) of liquid A and liquid B is injected.

In the injection of cavities or large gaps in the ground, drilling is performed to the target location by boring, etc., and an injection tube is provided for injection.

Moreover, when using for a ground injection construction method, it will inject | pour using the injection pipe of the injection construction method.

In the above embodiment, the case where the liquid A and the liquid B are mixed and stirred is described as an example. However, the present invention is not limited to this, and a plurality of liquids of two or more liquids are prepared, stirred and injected. In this case, each liquid is sucked with an independent preparation and injection pump, the flow rate is adjusted with a flow rate adjusting device, and then mixed and stirred with a stirring and mixing pump to meet various prescriptions. While mixing and stirring, preparation, mixing and injection can be continuously performed in a continuous line. In addition, when a simple pumping system is used for each compounding and injection pump that is independent of each liquid and a tube type pump with high quantitative performance due to pressure change is used, the suction volume is checked with a flow meter without using a flow controller. After adjusting the flow rate by inverter control, it can be used in the same manner as described above.

[Experimental example]
[Device specifications]
Model Capability Power A Liquid pump 1 Tube pump KB-85 50-250L / min 15KW
B liquid pump 2 Tube type pump KB-50 10-60L / min 11KW
Electromagnetic flowmeter 6,7 Diameter 2B
Stirring injection pump 3
Slurry pump DMG-37 type 30m3 / min 3.7KW
Discharge pressure 0.5MPa (MAX)
Rotation speed 3000rpm / min 50Hz

〔experimental method〕
Two A liquid and B liquid pumps of the same type, two electromagnetic flowmeters, and one stirring injection pump were used, and each pump was equipped with a control panel equipped with an inverter.
The stirring injection pump was always set to the same flow rate, and the total amount was set to the arbitrary injection flow rate shown in Table 1.

  The stirring injection pump was set to an arbitrary hertz using an inverter, and the rotation speed of the impeller was adjusted to the arbitrary rotation speed shown in Table 2.

To confirm the stirring performance, calculate the specific gravity of liquid A and liquid B, confirm that the specific gravity of the sample collected in the experiment is within the design range, and check the stirring effect with the table flow (stationary, 15 placements) ) And the pH at the time of charging in water. In the specific gravity measurement, a sample collected from the suction hose 2 and 4 is put into a 1 L piece of ground material, and a 1 L sample weight is measured. The flow value is measured by measuring the maximum value and the minimum value of the spread when the sample collected from the hose port is put into a cylindrical container having a diameter of 80 mm and pulled up. Further, the spread was measured by flicking up and down 15 times. Furthermore, in water non-separation measurement, the sample collected from the hose port was poured into water, the change in the pH value of water was measured, and the dilution strength was measured.
With the pressure transmitter 8, the change of the pressure value at the time of stationary and injection | pouring of the stirring injection pump 3 was measured.
These blending examples are shown in Table 3, and the test results are shown in Table 4.

As is clear from the above test results, it was found that the diameter of the used stirring injection pump 3 was 2B, the specific gravity was all in the expected value range, and equal amounts of liquid A and liquid B were mixed. Moreover, it turned out that the rotation speed of the required impeller of the stirring injection pump affects the mixing effect of the material depending on the flow rate. It was proved that it is possible to carry out moderate stirring and mixing over a wide range by controlling the rotation speed of the stirring injection pump in a range from a small amount of 30 L / min to a large flow rate of 400 L / min. It was found that if the flow rate was small, excessive stirring of the liquid A and liquid B would cause excessive dispersion of the material if the impeller rotation speed was too large. Furthermore, the pressure transmitter 8 attached to the tip of the A liquid pump and the B liquid pump always showed 0.3 N / mm ² at a flow rate of 200 L / min when the stirring injection pump 3 was stationary, but a 50 Hz stirring injection pump. 3 was 0.03 N / mm ² at start-up.

It is explanatory drawing which shows schematic structure of the 2 liquid preparation / stirring / injection apparatus which concerns on one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 A liquid preparation injection pumps 2, 4 Suction hose 3 Stirring injection pump 5 B liquid preparation injection pumps 6, 7 Flow control device

Claims (3)

  A plurality of fluids are respectively pumped to a stirring injection pump by adjusting the flow rate with a suction pump via a flow rate control device provided in the flow path of each fluid, and the plurality of fluids are required by the stirring injection pump. A mixing / stirring / injecting device for a plurality of fluids, wherein the fluid prepared and mixed by stirring and pumping is pumped in a one-liquid state after being stirred and mixed at a mixing rate of 5%. The agitated and mixed fluid is a grout material that is injected into the ground, a structure, and a cavity or a gap in the boundary surface between the ground and the structure, and the plurality of fluids constituting the grout material include a hardening expression material. It consists of a fluid mortar containing the main component and a fluid swelling liquid containing montmorillonite clay mineral. The mortar and the swelling liquid are sucked by separate suction pumps, and the flow of each mortar and the swelling liquid. The flow rate is adjusted via a flow rate control device installed in the passage and is pumped to the stirring injection pump. After the mixing and mixing at the required mixing rate by the stirring injection pump, the mixture is gelled and non-flowable. A multi-fluid blending / stirring / injecting apparatus characterized in that a grout material transformed into a plastic state is pumped in a one-liquid state to the vicinity of an injection port.   The other liquid material that changes one liquid into a plastic state includes an inorganic material such as sodium silicate, aluminum sulfate, or a slurry that produces ettringite, according to claim 1 or 2. The multiple fluid preparation, agitation, and injection device described.

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