JP2012077454A - Mixing device for two liquid mixture type injection material used in excavating and burying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing device for a two liquid mixture type injection material used in an excavating and burying method, which has simple structure, small size, excellent mixing efficiency without requiring no surplus power, and ability to cope with changes in mixing conditions.SOLUTION: A mixing device for a two liquid mixture type injection material is used in an excavating and burying method which uses an excavating and burying machine to sequentially install a pipe or a segment in underground. The mixing device for mixing two liquids is used during installation to mix components of two liquid mixture type lubricant or back-fill material which is injected to a void between the excavating and burying machine and the pipe or between the segment and natural ground, including glass spheres encapsulated in a mixing case having a liquid A inlet, a liquid B inlet, and a mixture outlet.

Description

  The present invention is a two-component mixed type lubricant or backfill that is injected into the space between the outer circumference of the propulsion burial excavator and the pipe or segment and the ground when the pipe or segment is installed underground by the propulsion burial method. The present invention relates to a two-component mixing apparatus.

  Generally, in the construction method in which pipes or segments are installed underground by the propulsion embedding method, a horizontal hole is excavated by a propulsion embedding machine such as a shield excavator between the starting shaft and the reaching shaft, and the pipe or segment is placed in the excavated lateral hole. Will be installed sequentially.

  In the propulsion embedding method, the gap between the excavated horizontal hole and the propulsion embedding machine main body and pipe or segment is injected with a sliding material that reduces friction with the natural ground and a backfill material that fills the clearance with the natural ground. The As the lubricant and the backfill material, a two-component mixed type is known. As a two-component mixed type lubricant, for example, one that mixes a liquid A containing swollen bentonite and a liquid B that adjusts viscosity and frictional resistance with a mixing device and injects the mixture into a gap with a natural ground is known. ing. In addition, as a two-component mixed type backfill material, for example, water absorption that absorbs and swells by reacting with liquid A in which alkali metal or alkaline earth metal component is mixed with cement milk and alkali metal or alkaline earth metal component What mixes with B liquid containing an active particle and inject | pours into the space | gap with a natural ground is known.

  Such a two-liquid mixed type lubricant or backfill material forms liquid A and liquid B, respectively, and supplies and mixes liquid A and liquid B into a two-liquid mixing apparatus installed underground in separate supply paths. After that, it is injected into the gap between the excavated lateral hole and the propulsion embedding machine body and the pipe or segment.

JP-A-7-206503 JP 2002-327597 A

  In the conventional two-component mixing apparatus, in order to obtain a homogeneous mixed solution, a spiral mixing channel is arranged to lengthen the mixing channel of the A and B solutions, or a plurality of partition plates are arranged alternately. Have been proposed. Since these two-liquid mixing apparatuses need to lengthen the mixing channel in order to obtain a homogeneous mixed liquid, the mixing apparatus itself has large dimensions such as length and width. A two-component mixing device installed in a narrow underground space is required to be as small and simple as possible. Therefore, if the size of the mixing device itself is large, there is a space for installing other equipment that needs to be installed in a narrow underground space. The problem of being restricted occurs. Also, the conventional two-component mixing device can easily adapt to changes in mixing conditions according to changes in the viscosity of the mixed solution, frictional resistance, chemical properties of the A and B solutions, flow rates, pressures, etc. It had the problem that it was not possible.

  The present invention solves the problems of the prior art, and is a two-component mixed injection material used in a propulsion embedding method that has a simple configuration, is small in size, has good mixing efficiency, and can cope with changes in mixing conditions. An object of the present invention is to provide a mixing apparatus.

In order to solve the above problems, the mixing device for a two-component mixed injection material used in the propulsion embedding method of the present invention, when installing a pipe underground with a propulsion embedding machine, the propulsion embedding machine and the pipe or segment, A two-liquid mixing device for mixing a two-liquid mixed type lubricant or backfill material injected into the space between the ground and the ground, forming a liquid A inlet, liquid B inlet, and liquid outlet A glass sphere is enclosed in the mixed case.

  Moreover, the mixing device of the two-liquid mixing type injection material used for the propulsion embedding method of the present invention is characterized in that the length of the mixing case in the flow path direction of the mixed liquid can be adjusted.

  Moreover, the mixing device of the two-liquid mixing type injection material used for the propulsion embedding method of the present invention is characterized in that the size of the glass sphere sealed in the mixing case can be selected.

  Moreover, the mixing device of the two-liquid mixing type injection material used for the propulsion embedding method of the present invention is characterized in that the encapsulation density of the glass spheres enclosed in the mixing case can be changed.

Two liquids for mixing a two-component mixed type lubricant or backfill material injected into the space between the propulsion buried excavator and the pipe and the ground when installing the pipe underground by the propulsion buried excavator A mixing apparatus comprising a glass sphere enclosed in a mixing case in which a liquid A inlet, a liquid B inlet, and a liquid outlet are formed, and A supplied in the mixing case in which the glass sphere is enclosed The liquid and the B liquid are divided and passed through the gaps between the plurality of glass spheres, and the mixing flow path is lengthened to make the mixing channel long, so that efficient mixing is possible in a small mixing case. Further, by making the mixed spheres into glass spheres with moderate specific gravity and corrosion resistance, the glass spheres roll in the mixing case according to the flow rate and pressure of the liquid A and liquid B to improve the mixing efficiency, and the liquid A Corrosion due to chemical components contained in the B liquid is prevented. Further, since the glass sphere can be easily cleaned, it can be used repeatedly. Furthermore, glass spheres have the advantage of being inexpensive and easy to obtain.
With the configuration in which the length of the mixed case in the flow path direction of the mixed liquid can be adjusted, the mixing time can be easily controlled.
With the configuration that allows selection of the size of the glass spheres enclosed in the mixing case, the width of the mixing channel in the mixing case is changed to accommodate changes in the chemical properties, flow rates, and pressures of liquid A and liquid B. It becomes possible to adapt to the mixing conditions.
With the configuration in which the sealing density of the glass spheres sealed in the mixing case can be changed, it is possible to adapt to the mixing conditions corresponding to the chemical properties, flow rates, and pressures of the liquid A and liquid B.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are diagrams showing an outline of a propulsion embedding method using the two-liquid mixed injection material mixing apparatus of the present invention. 1 and 2 show an example of a propulsion embedding method in which a pipe or a segment is newly installed in the basement, but the two-liquid mixed injection material mixing device of the present invention uses an existing pipe embedded in the basement. It can also be applied to the propulsion embedding method for rebuilding existing pipes for rebuilding new pipes.

As shown in FIG. 1, a start shaft 1 and a reaching shaft 2 are excavated from the ground to the basement, and a horizontal hole is excavated from the start shaft 1 by a propulsion buried excavator 3. Pipes or segments 4 are sequentially installed in the horizontal holes excavated by the propulsion embedding machine 3. Since the inner diameter of the horizontal hole excavated by the propulsion embedding machine 3 is slightly larger than the outer diameter of the pipe or segment 4 installed in the horizontal hole, the gap between the horizontal hole and the outer periphery of the pipe or segment 4 is backed up. Material 5 is injected. In addition, when propelling the burial machine 3 is propelled, a lubricant may be injected into the outer periphery of the propulsion burial machine 3 in order to reduce the frictional force with the natural ground. When propelling the pipe into the excavated horizontal hole with a forward dimension push jack, a lubricant may be injected to reduce the frictional force between the pipe and the ground.

  As a lubricant or a backfill material, a two-component mixed type is known. As a two-component mixed type lubricant, for example, one that mixes a liquid A containing swollen bentonite and a liquid B that adjusts viscosity and frictional resistance with a mixing device and injects the mixture into a gap with a natural ground is known. ing. In addition, as a two-component mixed type backfill material, for example, water absorption that absorbs and swells by reacting with liquid A in which alkali metal or alkaline earth metal component is mixed with cement milk and alkali metal or alkaline earth metal component What mixes with B liquid containing an active particle and inject | pours into the space | gap with a natural ground is known.

In the case of a two-component mixed type lubricant or backfill material, if it takes a long time from mixing to injection, properties such as viscosity and frictional resistance change and the injection operation becomes difficult. At the tip of the tube or segment 4 near the injection site. The A liquid tank 8 and the B liquid tank 9 constituting a two-liquid mixed type lubricant or backfill material are installed on the ground portion of the start shaft 1. As shown in FIG. 2, stirring blades 10 for uniformly adjusting the A liquid and the B liquid are installed in the A liquid tank 8 and the B liquid tank. The A liquid from the A liquid tank 8 is supplied from the A liquid supply path 11 to the underground two-liquid mixing device 7 via a pump . The B liquid from the B liquid tank 9 is supplied from the B liquid supply path 12 to the underground two-liquid mixing device 7 via a pump .

  The liquid A and the liquid B mixed by the two-liquid mixing device 7 are injected into the outer peripheral portion of the propulsion embedding machine 3 into the space between the pipe or segment and the natural ground through the injection pipe 13.

  FIG. 3 is a view showing a two-component mixing apparatus 7 of the present invention. The two-component mixing device 7 includes a cylindrical mixing case 14. The mixing case 12 includes a liquid A supply port 15 to which the liquid A supply pipe 11 is connected, a liquid B supply port 16 to which the liquid B supply pipe 12 is connected, and a liquid mixture discharge port 17 to which the supply pipe 13 is connected. Is done. At positions corresponding to the liquid A supply port 15, the liquid B supply port 16, and the liquid mixture discharge port 17 in the mixing case 14, the liquid A supply port 15 and the liquid B supply port 16 are provided by glass spheres 18 enclosed therein. In order to prevent the mixed liquid discharge port 17 from being blocked, a spherical body stop plate 19 having a plurality of holes smaller than the diameter of the glass spherical body 18 is installed.

The mixing case 14 is configured by detachably connecting a central cylindrical body between a cylindrical body in which the A liquid supply port 15 and the B liquid supply port 16 are also formed and a cylindrical body in which the mixed liquid discharge port 17 is formed. The The length in the direction of the mixing channel can be adjusted by changing the length of the central cylinder. Further, the central cylindrical body may be constituted by two cylindrical bodies that are telescopically connected, and the mixing case 14 can be expanded and contracted to adjust the length in the mixing flow path direction.

  A glass sphere 18 is enclosed in the mixing case 14. The glass sphere 18 encloses the number of capacities that can roll within the mixing case 14. The glass sphere as a sphere to be enclosed in the mixing case 14 is corrosion resistant to chemical components in the liquid A and liquid B, and has a specific gravity of 2.5, so it is liquid A supplied into the mixing case 14. , Because it is easy to roll by the flow rate and pressure of the B liquid, the mixing efficiency is improved. If the specific gravity of the sphere sealed in the mixing case 14 is large, the sphere will not easily roll due to the flow rate and pressure of the liquid A and liquid B, and foreign matter will accumulate between adjacent spheres, resulting in a decrease in mixing efficiency. There is. The glass sphere sealed in the mixing case 14 is a low price compared to a metal sphere such as aluminum, for example, is easy to clean after use, and can be reused. It is suitable as a mixing sphere of the mixing device 7.

FIG. 4 is a diagram for explaining the operation of the glass sphere 18 enclosed in the mixing case 14.
The glass sphere 18 enclosed in the mixing case 14 repeats the splitting and merging of the liquid A and the liquid B in the gap between the glass spheres 18 adjacent to the four sides. As a result, the mixing channel becomes longer. As a result, even in the mixing case 1 having a short length in the flow path direction, the liquid A and the liquid B are efficiently mixed and supplied to the injection pipe 13 from the liquid mixture discharge port 17, and the propulsion embedding machine 3 is used as a lubricant or a backfill material. Between the pipe and the segment 4 and the ground.

  The two-component mixing device 7 needs to obtain a homogeneous mixed solution. As a first measure for obtaining a homogeneous mixed liquid even if conditions such as the chemical properties, viscosity, flow rate, pressure, etc. of the A liquid and B liquid change, the mixing case 14 is lengthened in the flow path direction of the mixed liquid. The height is adjustable. In order to be able to adjust the length in the direction of the flow path of the mixed liquid, the mixing case 14 includes a cylinder body in which the A liquid supply port 15 and the B liquid supply port 16 are also formed, and a cylinder in which the mixed liquid discharge port 17 is formed. The central cylinder is detachably connected to the body to change the length of the central cylinder. In order to adjust the length of the mixing case 14 in the direction of the mixing flow path, the central cylindrical body is connected to the two cylindrical bodies in a telescopic manner. When the length of the mixing case 14 in the flow path direction is changed, naturally, the number of glass spheres 18 enclosed also changes. By making the length of the mixing case 14 adjustable in the direction of the flow path of the mixed liquid, it becomes possible to control the mixing time, and the conditions such as the chemical properties of the liquid A and liquid B, viscosity, flow rate, pressure, etc. It is possible to obtain a homogeneous liquid mixture corresponding to the change.

  The size of the glass sphere 18 enclosed in the mixing case 14 is a second countermeasure for obtaining a homogeneous mixed liquid even if the chemical properties, viscosity, flow rate, pressure, etc. of the A liquid and B liquid change. Can be selected. When the diameter of the glass spheres 18 enclosed in the mixing case 14 is large, the gap between the glass spheres 18 is larger than that of the small diameter glass spheres. As a result, the small diameter glass spheres 18 are enclosed. Compared to the case, the mixing flow path becomes shorter, and the mixing time can be controlled. By making the size of the glass sphere 18 enclosed in the mixing case 14 selectable, it becomes possible to control the mixing time, and the conditions such as the chemical properties, viscosity, flow rate, pressure, etc. of the liquid A and liquid B Accordingly, it becomes possible to obtain a homogeneous mixed solution corresponding to the change of the above.

  Glass spheres enclosed in a mixing case as a third measure to obtain a homogeneous mixed solution even if conditions such as the chemical properties of the A and B solutions, the flow rates of the A and B solutions, and the pressure change It is possible to change the encapsulation density. When the encapsulating density of the glass sphere is increased, the mixing channel becomes longer and the mixing time becomes shorter than when the enclosing density is decreased. By making it possible to change the density of the glass spheres enclosed in the mixing case, it is possible to control the mixing time and change the conditions such as the chemical properties, viscosity, flow rate, pressure, etc. of liquid A and liquid B. Correspondingly, a homogeneous mixed solution can be obtained.

  As described above, according to the mixing device of the two-liquid mixed type filler used in the propulsion embedding method of the present invention, the A liquid and the B liquid supplied in the mixing case in which the glass spheres are enclosed are made of a plurality of glasses. Efficient mixing is possible in a small mixing case by repeatedly diverging and joining the gaps between the spheres and lengthening the mixing flow path. Further, by making the mixed spheres into glass spheres having an appropriate specific gravity and corrosion resistance, the glass spheres roll by the flow of the liquid A and the liquid B in the mixing case to improve the mixing efficiency, and the liquids A and B Corrosion due to chemical components contained in the liquid is prevented and cleaning is easy, so that it can be used repeatedly. Furthermore, glass spheres have the advantage of being inexpensive and easy to obtain.

  1: start shaft, 2: reach shaft, 3: propulsion burial machine, 4: pipe or segment, 5: backfill material, 6: lubricant, 7: 2 liquid mixing device, 8: liquid A tank, 9: liquid B Tank: 10: stirring blade, 11: A liquid supply pipe, 12: B liquid supply pipe, 13: injection pipe, 14: mixing case, 15: A liquid supply port, 16: B liquid supply port, 17: mixed liquid discharge Exit, 18: Glass sphere, 19: Sphere stop plate

Claims (4)

  When a pipe or segment is installed in the basement by a propulsion burial machine, the two-liquid mixed type lubricant or backfill material injected into the space between the propulsion burial machine and the pipe or segment and the ground is mixed. A two-liquid mixing device for use in a propulsion embedding method characterized by enclosing a glass sphere in a mixing case in which a liquid A inlet, a liquid B inlet, and a liquid outlet are formed. Mold injection material mixing device.   The mixing device of the two-liquid mixed type injection material used for the propulsion embedding method according to claim 1, wherein the mixing case is adjustable in length in the flow path direction of the mixed liquid.   The size of the glass sphere enclosed with the said mixing case is selectable, The mixing device of the 2 liquid mixing type injection material used for the propulsion embedding method of Claim 1 or 2 characterized by the above-mentioned.   The mixing device of the two-liquid mixing type injection material used for the propulsion embedding method according to any one of claims 1 to 3, wherein an encapsulation density of the glass spheres enclosed in the mixing case is changeable. .

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