JP2014218541A - Production method of solution type grout and production device of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production device of a solution type grout capable of obtaining grouts having a predetermined grain size or lower with a simple structure, different from a complicated and large device such as a classification tank using gravity, or a device using a filter material which needs function regeneration periodically by replacement of the filter material or back washing or the like.SOLUTION: The production device comprises: centrifugal force application means having an agitator 2 for applying centrifugal force to a raw material of a solution type grout formed of mainly colloidal silica; and extraction means having a discharge pipe 4 for extracting the solution type grout to be poured into a foundation from a center of the raw material on which the centrifugal force acts.

Description

  The present invention relates to a method for producing a solution type grout material containing colloidal silica as a main component, and an apparatus for producing the solution type grout material.

  In recent years, solution-type grout materials mainly composed of colloidal silica have high permeability to ground gaps and rock cracks, and are also excellent in durability. Widely used as water material.

  This solution type grout material is mainly composed of colloidal particles having a particle diameter of about 10 nm. In order to obtain the desired water-stopping effect with this solution-type grout material, it is necessary to sufficiently penetrate the gaps in the ground and cracks in the rock mass, but this permeability is affected by clogging of particles in the grout material. This has been confirmed by the applicant's experiment.

  The outline of the above experiment will be described. This experiment consists of a solution type grout material mainly composed of colloidal silica filtered through a 25 μm sieve on a simulated ground made of silica sand having a height of 40 cm, and a solution type grout material not filtered. And is done by injecting. FIG. 3 shows the relationship between the elapsed time (min) obtained by this experiment and the penetration distance (cm) of the grout material.

As shown in FIG. 3, the experimental penetration of the solution-type grout material that has been subjected to the filtration treatment almost agrees with the expected penetration distance calculated from the viscosity of the grout material. In contrast, in solution-type grout materials that have not been filtered, the permeation distance in the experimental results is far below the expected permeation distance calculated from the viscosity of the grout material, resulting in a decrease in permeability that cannot be explained only by viscosity change. I understand that Therefore, in the solution-type grout material that has not been filtered, particles having a particle size of 25 μm or more are present in the solution-type grout material, and this causes clogging, resulting in a decrease in permeability in the simulated ground. It is expected that.
That is, when adding a curing accelerator to a silica-based grout, it is considered that a gel having a large particle diameter is formed although a gel having a large particle size is gradually abruptly progressed locally. .

  As described above, since the particle size of the grout material greatly affects the permeability of the grout material, it is important to obtain a grout material having a predetermined particle size. For this reason, in Patent Document 1, the grout material is classified into a distribution state corresponding to the particle size in a classification tank using gravity, and then the grout material having a predetermined particle size distribution is sorted from the classification tank, A grout material having a particle size distribution within a predetermined range is obtained.

JP-A-8-333570

  As described above, since the particle size of the grout material greatly affects the permeability of the grout material, it is important to obtain a grout material having a predetermined particle size. However, as shown in the above-mentioned Patent Document 1, when the grout material having a particle size distribution within a predetermined range is obtained in a classification tank using gravity, there is a problem that the apparatus becomes large and complicated. ing.

  Further, in order to obtain a grout material having a predetermined particle size or less, a filtration process using a filter material has been proposed. This filtration treatment can reliably obtain a grout material having a predetermined particle size or less. However, since the function is deteriorated due to clogging of the filter material due to the continuation of the filtration treatment, the filter material can be replaced with a filter material or backwashed. Therefore, there is a problem in obtaining a large amount of grout material by filtration at the construction site.

  The present invention has been made in view of the above-described problems, and provides a manufacturing method of a solution type grout material and a manufacturing apparatus thereof capable of obtaining a grout material having a predetermined particle size or less with a simple configuration. Objective.

  In order to achieve the above object, the method for producing a solution-type grout material according to the present invention is a method for producing a solution-type grout material containing colloidal silica as a main component, and applies centrifugal force to the raw material of the solution-type grout material. The solution type grout material to be injected into the ground is extracted from the central portion of the raw material on which the centrifugal force acts.

  In the present invention, when centrifugal force is applied to the raw material of the solution-type grout material, the colloid having a large particle size moves outward from the central portion by the centrifugal force, and the solution-type grout material containing the colloid having a small particle size is centrifugal force. Move to the center of the. For this reason, an apparatus that is large and complicated like a conventional classification tank using gravity, or an apparatus that uses a filter material that needs to be periodically regenerated by filter material replacement, backwashing, etc. In contrast, with a simple configuration, a large amount of a solution type grout material containing a colloid having a small particle diameter can be obtained from the central portion of the raw material on which centrifugal force acts.

  Moreover, in the manufacturing method of the solution type grout material which concerns on this invention, it is preferable that the coarse-grain content of raw materials other than the solution type grout material extracted is used again as a raw material of solution type grout material.

  According to the present invention, the coarse portion of the raw material of the solution-type grout material containing colloids having a large particle size has a large particle size in the process of being used again as a raw material and again in the process of applying centrifugal force. The colloid is subdivided. For this reason, the raw material of the solution type grout material can be used without waste without being discharged out of the system.

  In the solution type grout material manufacturing apparatus according to the present invention, the centrifugal force applied means for adding centrifugal force to the raw material of the solution type grout material mainly composed of colloidal silica, and the centrifugal force applied by the centrifugal force addition means And an extraction means for extracting a solution type grout material to be injected into the ground from the central portion of the raw material on which is applied.

  According to the present invention, when a centrifugal force is applied to the raw material of the solution-type grout material, the colloid having a large particle size moves outward from the central portion of the raw material on which the centrifugal force acts, and includes a colloid having a small particle size. The mold grout moves to the central part of the centrifugal force. For this reason, an apparatus that is large and complicated like a conventional classification tank using gravity, or an apparatus that uses a filter material that needs to be periodically regenerated by filter material replacement, backwashing, etc. In contrast, with a simple configuration, a large amount of a solution type grout material containing a colloid having a small particle diameter can be obtained from the central portion of the centrifugal force.

  Moreover, in the manufacturing apparatus of the solution type grout material which concerns on this invention, it is preferable that the coarse-grain content of raw materials other than the solution type grout material extracted by an extraction means is used again as a raw material of a solution type grout material.

  In this case, the raw material of the solution-type grout material containing a colloid having a large particle size is fragmented into a colloid having a large particle size in the course of the movement to be used again as a raw material and again in the process of applying centrifugal force. For this reason, the raw material of the solution type grout material can be used without waste without being discharged out of the system.

  Moreover, in the solution type grout material manufacturing apparatus according to the present invention, the centrifugal force applying means is a bottomed cylinder having an upper opening and a storage tank for storing the raw material, and a central portion in the storage tank is rotated about the rotation axis. And a stirring blade.

  In this case, centrifugal force is applied to the raw material of the solution-type grout material in a cylindrical storage tank. For this reason, the apparatus which adds centrifugal force is realizable with the storage tank of a simple structure.

  Moreover, in the manufacturing apparatus of the solution type grout material which concerns on this invention, it is preferable that the diffuser pipe is provided in the bottom face vicinity of the storage tank, and tank tank vicinity.

  In this case, the colloid with a large particle diameter existing near the tank wall of the storage tank can be positively discharged out of the tank accompanying the rising bubbles.

  Further, in the solution type grout material manufacturing apparatus according to the present invention, the centrifugal force applying means is constituted by a cyclone type separation device.

  In this case, centrifugal force is applied to the raw material of the solution-type grout material by a cyclone separator. For this reason, the apparatus which adds a centrifugal force is realizable with the cyclone-type separation apparatus of a simple structure.

  According to the method and apparatus for producing a solution type grout material of the present invention, it is possible to obtain a large amount of grout material having a predetermined particle size or less with a simple configuration.

It is a schematic block diagram of the manufacturing apparatus of the solution type grout material used in order to implement the manufacturing method of the solution type grout material by the 1st Embodiment of this invention. It is a schematic block diagram of the manufacturing apparatus of the solution type grout material used in order to implement the manufacturing method of the solution type grout material by 2nd Embodiment. It is a graph which shows the relationship between the time passage obtained by experiment, and the penetration distance of grout material.

  Hereinafter, a manufacturing method of a solution type grout material and an apparatus for manufacturing the same according to an embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment, and constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. .

(First embodiment)
FIG. 1 is a schematic configuration diagram of a solution type grout material production apparatus (hereinafter referred to as “grout material production apparatus”) A1 suitable for carrying out the method for producing a solution type grout material according to the first embodiment. is there. This grout material manufacturing apparatus A1 includes a mixer 1 having an inner tank 1a (storage tank) and an outer tank 1b.

The inner tank 1a has a cylindrical shape with an upper opening and a bottom, and a space of a predetermined capacity is formed therein. And in this inner tank 1a, the stirrer 2 (centrifugal force addition means) provided with the stirring blade rotated with a motor etc. about this center part as a rotating shaft is provided. Further, an air diffuser 3 is provided in the vicinity of the bottom surface in the inner tank 1a and in the vicinity of the tank wall. The air diffuser 3 is configured such that compressed air is supplied from a compressor (not shown).
Further, a discharge pipe 4 (extraction means) is provided at the center of the bottom in the inner tank 1a, and an injection pump 5 is connected to the discharge pipe 4.

As shown in the figure, the inner tank 1a is configured to be supplied with colloidal silica, a curing accelerator, and water (not shown) as raw materials for the solution-type grout material. The colloidal silica used is a well-known colloidal silica used as a water-stopping material for ground gaps and rock cracks, the hardening accelerator is a well-known hardening accelerator such as potassium chloride (KCl), and Water obtained by purifying industrial water or the like is used.
The mixing ratios of these raw materials are the properties of the ground and the bedrock into which the solution type grout material is injected (hereinafter referred to as “ground”. Therefore, the term “ground” in the present invention includes the bedrock). In addition, the capacity of the inner tank 1a is also determined by the injection amount of the solution type grout material to be used.

  The outer tank 1b has a cylindrical shape with a bottom at the upper opening provided around the inner tank 1a at a predetermined interval, and accepts a solution type grout material overflowing from the upper end of the tank wall of the inner tank 1a. It is configured to be. A pipe 7 connected to the pump 6 is connected near the bottom of the outer tub 1b. The discharge side of the pipe 7 is directed to the inner tank 1a. Therefore, the solution type grout material overflowing from the upper end portion of the tank wall of the inner tank 1 a is configured to be circulated through the pump 6 and the pipe 7.

Next, the manufacturing method of the solution type grout material using the grout material manufacturing apparatus A1 having the above configuration will be described.
First, colloidal silica, which is a raw material for the solution-type grout material, is supplied to the inner tank 1a, and a liquid composition prepared by kneading the curing accelerator and water in a separate tank, and the stirrer 2 is driven. Bubbles are released from the trachea 3. Note that the “curing accelerator” indicated by the arrow in FIG. 1 means the above-described liquid working (the same applies to FIG. 2 described later).

  The solution type grout material in the inner tank 1a is rotated in one direction by the stirrer 2 and mixed and stirred, and the colloid having a large particle size is crushed. Furthermore, colloids with a large particle size (coarse particles) are collected near the tank wall of the inner tank 1a by applying a centrifugal force. And the raw material (coarse part) of the solution type grout material containing the colloid with the large particle diameter is discharged | emitted to the outer tank 1b. The discharge to the outer tub 1b is efficiently performed by the bubbles released from the air diffuser 3. As a result of mixing and stirring by the stirrer 2, when a solution type grout material containing a colloid having a small particle diameter is collected at the center of the inner tank 1 a, the solution type grout material is discharged out of the tank and the liquid level as described later. Therefore, the amount of discharge to the outer tank 1b is reduced, so that new raw materials for the solution type grout material (colloidal silica, curing accelerator and water) are added into the inner tank 1a.

  When the coarse particles discharged to the outer tank 1b are circulated through the pump 6 and the pipe 7, the coarse particles are crushed and returned to the inner tank 1a. The coarse particles returned to the inner tank 1a are crushed by the stirrer 2 and subdivided. Therefore, the raw material of the solution type grout material discharged to the outer tub 1b is used without waste without being discharged out of the system.

  At the center of the bottom of the inner tank 1a, a solution type grout material containing colloids having a small particle diameter as a reaction of centrifugal force gathers. The solution type grout material is taken out of the tank through the discharge pipe 4 and injected. It is injected into the ground (not shown) via the pump 5.

  In the grout material manufacturing apparatus A1 having the above-described configuration, the solution type grout material supplied to the ground (not shown) via the infusion pump 5 is composed of a solution type grout material containing a colloid having a small particle size, and thus has excellent permeability. It can be a solution type grout material. Moreover, this solution-type grout material having excellent permeability is produced in large quantities and continuously using the raw material without waste in the mixer 1 having a simple configuration including the inner tank 1a, the outer tank 1b and the stirrer 2. There are advantages that can be done.

(Second Embodiment)
As shown in FIG. 2, the solution type grout material manufacturing apparatus A <b> 2 includes a cyclone type separation apparatus 10 and a mixing tank 20.

  The cyclonic separator 10 (centrifugal force adding means) is formed of a cylindrical body having a large diameter at the upper part and gradually becoming smaller toward the lower part in the same manner as a known cyclone separator, and is supplied in the tangential direction of the upper large diameter. A tube 11 is connected. A first discharge pipe 13 (extraction means) with an infusion pump 12 interposed in the middle is provided at the center of the upper large diameter, and a second discharge pipe is provided at the lower end of the lower small diameter section. 14 is provided.

  The mixing tank 20 has a space of a predetermined capacity inside the upper opening, and is provided with a stirrer 21 that is rotationally driven by a motor. The feed pipe 11 of the cyclonic separator 10 is connected to the bottom of the mixing tank 20 with a pump 22 interposed therebetween. Further, a second discharge pipe 14 of the cyclonic separator 10 is connected to the upper part of the mixing tank 20 with a circulation pump 23 interposed therebetween.

  In the mixing tank 20, like the inner tank 1a of the grout material manufacturing apparatus A1 shown in FIG. 1 described above, colloidal silica as a raw material of the solution type grout material, and a hardening accelerator and water are kneaded in advance in a separate tank. The prepared liquid is supplied.

  Next, the manufacturing method of the solution type grout material using the grout material manufacturing apparatus A2 having the above configuration will be described. First, in the mixing tank 20, colloidal silica, a curing accelerator, and water, which are raw materials for the solution-type grout material, are mixed and stirred by the stirrer 21.

  The raw material of the solution-type grout material mixed and stirred in the mixing tank 20 is supplied to the cyclone separator 10 via the pump 22 and the supply pipe 11. The colloid (coarse fraction) having a large particle size of the raw material supplied to the cyclone separator 10 moves to the inner wall side of the cyclone separator 10 by applying centrifugal force, and the coarse fraction Is gradually guided downward along the inner wall of the tank. Then, the raw material of the solution type grout material including the coarse particles is returned to the mixing tank 20 through the circulation pump 23 and the pipe 14.

  When returning to the mixing tank 20 via the circulation pump 23 and the pipe 14, the coarse particles of the raw material are crushed during the circulation and returned to the mixing tank 20. Moreover, the coarse particle part returned in the mixing tank 20 is crushed with the stirrer 21, and is subdivided. Therefore, the raw material of the solution type grout material is used without waste without being discharged out of the system.

  In the central part of the cyclonic separator 10, a solution type grout material containing colloids having a small particle diameter as a reaction of centrifugal force gathers, and this solution type grout material is taken out of the tank through the first discharge pipe 13. At the same time, it is injected into the ground (not shown) via the injection pump 12.

  When the liquid level in the mixing tank 20 is lowered to a predetermined level by removing the solution type grout material from the tank via the first discharge pipe 13, a new solution type grout material is placed in the mixing tank 20. Raw materials (colloidal silica, curing accelerator and water) are added.

  In the solution type grout material manufacturing apparatus A2 having the above-described configuration, the solution type grout material supplied to the ground (not shown) via the infusion pump 12 is made of a solution type grout material containing a colloid having a small particle size, so that it is permeable. An excellent solution-type grout material can be obtained. In addition, the solution type grout material having excellent permeability has a simple structure including the cyclone type separation device 10 and has an advantage that it can be continuously manufactured while using raw materials without waste.

  As mentioned above, although the manufacturing method of the solution type grout material by this invention and embodiment of the manufacturing apparatus were demonstrated, this invention is not limited to said embodiment, It changes suitably in the range which does not deviate from the meaning. Is possible.

For example, in the present embodiment, the coarse particles of the raw material other than the solution type grout material to be extracted are again used as the raw material of the solution type grout material, but the method and the manufacturing apparatus are not limited to this. It is good also as a method and a manufacturing apparatus which do not reuse a grain fraction.
Moreover, in the manufacturing apparatus of solution type grout material, although it is set as the structure which provides the stirrer 2 and the diffuser tube 3, these are also omissible.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

A1, A2 Solution type grout material production equipment (grout material production equipment)
1 Mixer 1a Inner tank (storage tank)
1b Outer tank 2 Stirrer (centrifugal force adding means)
3 Aeration pipe 4 Drain pipe (extraction means)
5 Injection pump 6 Pump 7 Piping 10 Cyclone separation device (centrifugal force adding means)
11 Supply pipe 12 Injection pump 13 First discharge pipe (extraction means)
14 Second discharge pipe 20 Mixing tank 21 Stirrer 22 Pump 23 Circulation pump

Claims (7)

A method for producing a solution-type grout material mainly comprising colloidal silica,
A method for producing a solution-type grout material, wherein a centrifugal force is applied to a raw material of the solution-type grout material, and a solution-type grout material to be injected into the ground is extracted from a central portion of the raw material on which the centrifugal force acts.   The method for producing a solution-type grout material according to claim 1, wherein the coarse particles of the raw material other than the extracted solution-type grout material are used again as a raw material for the solution-type grout material. Centrifugal force adding means for applying centrifugal force to the raw material of the solution type grout material mainly composed of colloidal silica;
Extraction means for extracting the solution-type grout material to be injected into the ground from the central portion of the raw material on which the centrifugal force applied by the centrifugal force adding means acts;
An apparatus for producing a solution-type grout material, comprising:   4. The apparatus for producing a solution type grout material according to claim 3, wherein the coarse particles of the raw material other than the solution type grout material extracted by the extraction means are used again as a raw material of the solution type grout material. The centrifugal force applying means is
A storage tank that has a bottomed cylindrical shape with an upper opening and stores the raw material;
A stirring blade that rotates around the central portion of the storage tank as a rotation axis;
The apparatus for producing a solution-type grout material according to claim 3 or 4, characterized by comprising:   The apparatus for producing a solution-type grout material according to claim 5, wherein an aeration tube is provided in the vicinity of the bottom surface of the storage tank and in the vicinity of the tank wall.   The apparatus for producing a solution-type grout material according to claim 3 or 4, wherein the centrifugal force applying means is constituted by a cyclone separator.

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