JPH07313860A - Grout agitator and agitating method using the agitator - Google Patents

Abstract

PURPOSE:To effectively mix a two-pack grout consisting essentially of a principle and a curing agent or a grout of cement powder and water in a short time with a simple and inexpensive device. CONSTITUTION:Plural circulating branch pipes 3A and 3C are branched from the main delivery pipe 1C of a submerged pump, and a grout agitator 1 is provided with a static mixer 2 furnished in the middle of the passage leading to the branch pipes 3A and 3C from the main delivery pipe 1C. The agitator is dipped in the liq. in a grout tank 5 to circulate the grout, and the grout is agitated and mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer for grout material injected into the ground for improvement of the ground and a stirring method using the stirrer.

[0002]

2. Description of the Related Art In recent years, as one of the ground improvement methods, a ground injection method has been frequently performed in which a grout material is injected or injected into the ground to form a solidified body. In this case, as the grout material, a grout material mainly composed of water glass or a cement milk-based material is often used from the viewpoint of safety. This water glass-based grout material is used to solidify the main ingredient, water glass (solution A), with a curing agent (solution B), which is a reaction agent. The slow-releasing type that gels in is used properly according to the application and construction method.

[0003] In the case of a quick-setting drug solution, normally, a 1.5-shot or 2-shot method is used in which solution A and solution B are fed in separate paths in the middle of a feeding path or in the soil. ,
In the case of a slow-releasing drug solution or a cement milk-based material, as shown in FIG. 11, the main ingredient and the curing agent, or the cement powder and water, the admixture, etc. are charged in advance in the stirring tank 50, and the stirring blade 51 is used. After mixing and stirring by the stirring device 52 having the above, the mixture is fed to the injection pipe.

[0004]

However, in the case of the agitation method described above, a dedicated agitation device having agitation blades is required in the tank, which is expensive in terms of equipment and heavy in weight, and therefore is difficult to carry or transport. It was troublesome to install. Further, since the rotating direction of the stirring blade and the flowing direction of the chemical liquid are the same direction, a co-rotation occurs in which the rotating speed of the stirring blade and the flowing speed of the chemical liquid are the same, and the stirring is substantially not performed. From the viewpoint of mixing, it was inefficient.

Therefore, the main problem of the present invention is that the apparatus is simple and inexpensive, and at the same time, a plurality of liquids such as a main component, a hardening material and a buffering agent or a solid powder of cement powder and a liquid can be effectively treated. The present invention provides a stirrer for grout materials that can be mixed, and a stirring method using the same.

[0006]

The above-mentioned problems can be solved by providing a plurality of branch pipes for circulation from the main feed pipe of the submersible pump. Further, in order to perform more effective mixing, a static mixer is provided in the middle of the pipeline from the main feed pipe to the branch pipe for circulation.

In this case, the respective outlets of the circulation branch pipe may be directed in the radial direction or the circumferential direction, or some of the circulation branch pipes may be directed in the radial direction and the other discharge ports may be directed. In the circumferential direction, or at least one of the branch pipes for circulation.
Direct the two outlets between the submersible pump and the main feed pipe,
By orienting each discharge port of the circulation branch pipe at a predetermined incident angle with respect to the inner wall of the grout tank to be used,
More effective mixing is possible. Further, in the case of the stirring device of the present application, it can be suitably applied to a rectangular grout tank.

In order to agitate the grout material using the agitator described above, at least the suction port and the discharge part of the grout agitator are installed in the grout tank in a state of being submerged in the grout tank. The grout material stored in the tank is circulated in the tank for stirring.

As another grout stirring device, a grout pressure feed pump is provided outside the grout tank, and a return path returning to the grout tank via a three-way valve is formed on the downstream side of the grout pressure feed pump. In addition, a static mixer can be arranged in the middle of this return path. In this case, it is desirable that the return path be branched to have a plurality of discharge ports to the grout tank.

[0010]

In the first stirring device according to the present invention, the submersible pump is branched from the main feed pipe to provide a plurality of branch pipes for circulation, and preferably the pipe extending from the main feed pipe to the branch pipe for circulation is provided. A static mixer such as a static mixer is installed in the middle of the path to serve as a grout stirring device. When stirring is performed using this stirring device, the grout material is placed in a tank in which each grout material is placed by submersion, and the grout material is circulated in the tank. The grout material is discharged from each outlet of the circulation branch pipe, and the flow in the tank becomes a turbulent state, and multiple liquids such as the main agent, hardening material and buffering agent, or cement powder and water etc. are efficiently Mixed. Further, the grout material is effectively mixed by being subjected to the dividing action and the converting action by the static mixer disposed in the middle of the pipeline while passing through the submersible pump.

On the other hand, in the case of the second stirrer according to the present invention, the grout pressure pump is disposed outside the grout tank, and the grout tank is connected to the grout tank via the three-way valve on the downstream side of the grout pressure pump. A return mixer is formed and a static mixer is arranged in the middle of the return conduit. In this case, it is possible to assemble a device that can easily agitate the grout by using a tank and a pipe via a pump in the middle, and the grout material can be efficiently used by a static mixer arranged in the middle of the pipeline. Mixed.

In this case, by branching the return path from the middle to provide a plurality of discharge ports to the grout tank, turbulent flow can be generated in the tank and mixing efficiency can be improved.

[0013]

EXAMPLES The present invention will be described in detail below based on examples.
FIGS. 1 to 7 show a first grout stirring device according to the present invention. For the stirring of grout material, a grout stirring device 1 which is a modified submersible pump is used in which a main ingredient and a curing agent are put in a predetermined composition. It is carried out by placing the grout material in the grout tank 5 in a liquid submerged state and circulating the grout material in the grout tank 5.

The grout stirring device 1 comprises an electric motor 1
A, and a casing 1B having a suction port 1b on the lower surface and surrounding an impeller 1D rotated by the electric motor 1A.
And an existing submersible pump consisting of a main feed pipe 1C communicating with the casing 1B, first the main feed pipe 1C
Is connected to the static mixer 2, and subsequently, the static mixer 2 is continuously connected to the circulating pipe fitting 3 formed of radially branched branch pipes 3A to 3D.

As shown in detail in FIG. 10, the static mixer 2 is provided with connecting flanges 24, 24 at both ends of a tubular housing 23, and a rectangular plate is twisted in the housing 23 by 180 °. The right element 20 and the left element 21 are arranged in a continuous state while alternately intersecting each other by 90 °, and the liquid passing therethrough undergoes the dividing action and the converting action by the element groups 20, 21, ... Are mixed together. In the present example, the static mixer 2 is disposed between the main feed pipe 1C and the circulation pipe fitting 3, but the circulation branch pipes 3A to 3 are provided.
The static mixer 2 may be arranged in each of the D tubes.

The circulation pipe fitting 3 is used for classifying the grout material sent by the submersible pump and circulating it again in the tank 5. In the illustrated example, four circulation branch pipes 3A are provided. 3D to classify in 4 directions, and grout material is circulated and discharged at 4 locations on substantially the same radius line. The number of the circulation branch pipes 3A, 3B ... Is at least two or more, preferably about 3 to 6.

As for the discharge direction, as shown in FIG. 2, the discharge ports 3a to 3d are radially discharged in the radial direction, or as shown in FIG. 3, the discharge ports 3a to 3d are circumferentially discharged. It is desirable to intentionally generate a turbulent vortex in the grout tank 5 by discharging the vortex toward the grouting tank 5. Further, as shown in FIG. 4, the ejection ports 3a and 3c are ejected in the circumferential direction, while the ejection ports 3b and 3d are ejected in the radial direction. You can also Further, as shown in FIG. 5, at least one of the outlets 3a to 3d of the circulation branch pipes 3A, 3B ... Is directed to a retention portion between the submersible pump 1 and the main feed pipe 1C. As a result, it is possible to eliminate a non-uniform portion that cannot be mixed.

Further, since the stirring device of the present invention stirs by the forced turbulent vortex flow, the stirrer can effectively stir even the rectangular grout tank 5A which is not suitable for conventional stirring. be able to. The rectangular grout tank 5A has advantages that it can be easily stacked and can be easily installed in a field space smaller than the circular grout tank 5.

In both the examples of FIGS. 6 and 7, the outlets 3a to 3d of the branch pipes 3A, 3B ... For circulation are directed to the inner wall of the rectangular grout tank 5A at a predetermined incident angle. However, in the case of FIG. 6, the vortex direction is a fixed direction, whereas in the case of FIG. 7, the adjacent discharge ports 3b, 3c (3a, 3a
This is an example in which the discharge flows are made to collide with each other and mixed as a set. Since the collision angle changes depending on the shape and size of the tank 5, it is appropriately determined while visually confirming the actual stirring condition.

On the other hand, 4 is a cap which can be attached and detached by fitting the screw grooves to each other, and is removed during cleaning to clean the inside of the pipe.

Next, FIG. 8 and FIG. 9 show a second grout stirring device according to the present invention. The grout agitator shown in the same figure has a grout pump 6 in addition to the grout tank 5.
Is provided, a return passage 8 for returning to the grout tank 5 via a three-way valve 7 is formed on the downstream side of the grout pump 6, and a static mixer 2 is arranged in the middle of the return passage 8. For stirring, the grout pump 6 is rotated to circulate the grout material in a state where the flow path in the direction of the injection pipe is closed by switching the three-way valve 7. The grout material is agitated and mixed by the static mixer 2 disposed in the middle of the flow path in the circulation process, and as shown in FIG. 9, the discharge port portion of the return pipe 8A supported by the support materials 9, 9 ... In the above, by arranging the outlets of the branch pipes 8a to 8d radially branched in four directions in the circumferential direction, a vortex flow is generated in the grout tank 5, and the grout material is also stirred in the tank 5. . In addition, it is possible to arbitrarily change the discharge ports of the circulation branch pipes 8a to 8d in the radial direction, or change some of the discharge ports in the circumferential direction and the other discharge ports in the radial direction. Is similar to the case of the first stirring device.

By the way, the grout stirring device of the present invention is a two-liquid type slow-mixing type injection material mainly composed of a main component and a hardening agent, as well as a cement milk-based injection material composed of cement, water, an admixture, etc. Can be applied to grout materials having a relatively long gel time.

[0023]

As described above in detail, according to the present invention, the apparatus is simple and inexpensive, and a plurality of liquids such as a main agent, a curing material and a buffering agent or a solid liquid of cement powder and a liquid are shortened. It is possible to use a grout material stirring device that can be effectively mixed with time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first grout stirring device according to the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a plan view of a modified example in which the directions of the discharge ports are changed.

FIG. 4 is a plan view of a modified example in which the directions of the discharge ports are changed.

FIG. 5 is a plan view of a modified example in which the directions of the discharge ports are changed.

FIG. 6 is a plan view when the direction of the discharge port is changed and a rectangular tank is used.

FIG. 7 is a plan view when the direction of the discharge port is changed and a rectangular tank is used.

FIG. 8 is a vertical sectional view of a second grout stirring device according to the present invention.

FIG. 9 is a plan view thereof.

FIG. 10 is an enlarged vertical sectional view of the static mixer.

FIG. 11 is a schematic view of a conventional stirring device.

[Explanation of symbols]

1 ... Grout stirring device, 2 ... Static mixer, 3
... circulation pipe fittings, 3A to 3D ... circulation branch pipe, 4 ... cleaning cap, 5 ... grout tank, 6 ... grout pump,
7 ... 3-way valve, 8 ... Return path

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09K 17/10 P 17/12 P E02D 3/12 101 // C09K 103: 00 (72) Inventor Kyozo Tamura, 1652 Kashiwai-cho, Hanamigawa-ku, Chiba-shi, Chiba Limited company Shibaura Kiko

Claims (11)

[Claims] 1. A stirrer for grout material, characterized in that a plurality of branch pipes for circulation are provided branching from a main feed pipe of a submersible pump. 2. The grout material stirring device according to claim 1, wherein a static mixer is provided in the middle of the conduit from the main feed pipe to the branch pipe for circulation. 3. The grout material stirring device according to claim 1, wherein each outlet of the circulation branch pipe is directed in a radial direction. 4. A stirrer for grout material according to claim 1, wherein each outlet of said circulation branch pipe is oriented in the circumferential direction. 5. The grout material stirring device according to claim 1, wherein some of the outlets of the circulation branch pipe are directed in the radial direction and the other outlets are directed in the circumferential direction. 6. The grout material stirring device according to claim 1, wherein at least one discharge port of the circulation branch pipe is directed between the submersible pump and the main feed pipe. 7. The grout material stirring device according to claim 1, wherein each of the outlets of the circulation branch pipe is oriented at a predetermined incident angle with respect to the inner wall of the grout tank to be used. 8. The grout material stirring device according to claim 1, wherein the grout tank used has a rectangular shape. 9. A grout tank, wherein at least the suction port and the discharge part of the grout stirring device according to claim 1 are installed in a submerged state, and the grout material stored in the grout tank is stored in the grout tank. A method for stirring a grout material, which is circulated and stirred in the tank. 10. A grout pump is disposed outside the grout tank, a return path is formed downstream of the grout pump via a three-way valve and returns to the grout tank, and a static path is provided in the middle of the return path. An agitation device for grout material, characterized in that a mixer is provided. 11. The grout material stirring device according to claim 10, wherein the return path is branched to form a plurality of discharge ports to the grout tank.