JP2011214244A - Chemical grouting method and chemical grouting apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a chemical solution cannot be injected from a plurality of injection ports without changing a position of a packer.SOLUTION: A leading end of an inner pipe rod 2 is sent outside of an outer pipe rod 3 in a position in which a flash-setting chemical solution is injected for the formation of the packer by a packer forming step; and a slow-setting chemical solution is injected from a plurality of inner pipe injection ports 7 which are provided at the leading end of the inner pipe rod 2. Thus, a receiving area of ground, into which the slow-setting chemical solution is simultaneously injected from the inner pipe injection ports 7, can be increased to raise a rate of infiltration into the ground. The leading end of the inner pipe rod 2 is sent outside of the outer pipe rod 3 without changing the position of the packer which is formed from the flash-setting chemical solution. This can change the injection position of the slow-setting chemical solution for being injected from the inner pipe injection port 7.

Description

  The present invention relates to a chemical solution injection method for injecting a chemical solution into the ground. Specifically, the inner tube rod that is hollow inside and the inlet is provided at the tip, and the inner tube rod that can be inserted into the hollow inside and the outer tube rod that is open at the tip, is used to supply the chemical solution into the ground. The present invention relates to a chemical injection method.

Conventionally, as a chemical solution injection method for injecting a chemical solution into the ground, for example, an outer tube having a chemical solution injection hole and an inner tube for drilling that is removably inserted in the outer tube are provided. Insert the heavy pipe into the ground, remove the inner pipe for drilling from the outer pipe, insert the inner pipe for chemical liquid injection into the outer pipe, and discharge from the inner pipe for chemical liquid injection while moving the inner pipe for chemical liquid injection A chemical solution injection method is known in which the injected chemical solution is injected from the chemical solution injection hole of the outer tube into the target ground (for example, Patent Document 1).

  However, in the technique described in Patent Document 1, the chemical liquid discharged from the chemical liquid injection inner pipe is injected into the target ground from one chemical liquid injection hole provided in the outer pipe while moving the chemical liquid injection inner pipe. Therefore, the receiving area of the injected chemical solution to the ground is small, the penetration efficiency is low, and it takes a lot of time to inject the chemical solution.

  In order to solve this problem, the outer tube and the inner tube are provided with an injection member concentrically arranged, and an outer tube flow path formed on the outer peripheral surface of the outer tube from the inner side of the outer tube and the outer side of the inner tube A first annular slit outlet that communicates with the inner pipe and a plurality of second annular slit outlets that communicate with the inner pipe flow path formed inside the inner pipe are arranged at arbitrary intervals in the longitudinal direction. A grout injection method using an injection tube, which is drilled to a predetermined depth in the ground to be improved in an anhydrous state using an injection tube, and then grout agent is simultaneously injected from a plurality of second annular slit outlets. A grout injection method has been proposed which discharges in a planar state in all directions on the outer periphery (for example, Patent Document 2). According to this technique, since the air curtain is formed in all directions of the outer periphery of the first annular slit outlet provided in the injection pipe, a plurality of second annular slit outlets provided in the injection pipe It is difficult for the chemical liquid discharged from the first annular slit outlet provided in the injection pipe to be discharged upward from the outer peripheral direction, effectively preventing the chemical liquid from leaking to the ground and improving the ground Since the receiving area of the fluid increases, the penetration rate into the improvement target ground increases, and the fluid can be efficiently injected into the improvement target ground in a short time.

JP 2004-84363 A JP 2008-169546 A

  The technique described in Patent Document 2 is a technique described in Patent Document 1 by discharging a grouting agent from a plurality of second annular slit discharge ports simultaneously in a planar state in all directions on the outer periphery of the injection tube. However, the technique described in Patent Document 2 forms an air curtain in all directions on the outer periphery of the first annular slit outlet provided in the injection pipe. Because the grout agent is discharged in a planar state in all directions on the outer periphery of the injection tube simultaneously from the plurality of second annular slit discharge ports provided in the injection tube while preventing the chemical liquid from leaking to the ground It was impossible to change the discharge position of the grout agent from the second annular slit discharge port without moving the position of the air curtain.

  The present invention has been made in view of the above problems, and it is possible to reduce the time for injecting the chemical solution, and the injection position of the slow-acting chemical solution injected from the injection port without moving the position of the packer. It aims at providing the chemical | medical solution injection construction method which can be changed freely.

  In order to solve the above problems and achieve the above object, the first aspect of the present invention comprises an inner tube rod having a hollow interior and an injection port provided at a distal end portion, and a hollow interior. This is a chemical solution injection method in which a chemical solution is injected into the ground using an outer tube rod that can be inserted with a tube rod and the tip is open. A double injection tube consisting of an inner tube rod and an outer tube rod is inserted into the ground. The injection tube insertion step, and at a predetermined position in the ground, with the tip of the inner tube rod and the tip of the outer tube rod being substantially in the same position, communicated with the inner tube passage formed inside the inner tube rod Injecting the instantaneous liquid medicine A from a plurality of inner tube inlets provided at the tip of the inner tube rod and communicating with the outer tube passage formed by the outer peripheral surface of the inner tube rod and the inner peripheral surface of the outer tube rod Instantaneous drug solution B is injected from the opening provided at the tip of the outer tube rod The inner tube rod sending step for sending the tip of the inner tube rod to the outside of the outer tube rod, and the inner tube rod sending step at the position where the instantaneous setting chemical solution is injected by the packer forming step. And a slow-release chemical solution injection step of injecting a slow-release chemical solution from a plurality of inner tube inlets provided at the tip of the inner tube rod.

  According to the present invention, the tip of the inner tube rod is sent out to the outside of the outer tube rod at the position where the packer is formed by injecting the instantaneous setting chemical solution by the packer forming step, and a plurality of the tubes are provided at the tip of the inner tube rod. Since the slow-release chemical solution is injected from the inner tube inlet, the receiving area of the ground into which the slow-release chemical solution is simultaneously injected from the inner tube inlet increases, and the penetration rate into the ground can be increased. While being able to do so, without changing the position of the packer formed by the instantaneous setting chemical solution, the distal end of the inner tube rod is sent to the outside of the outer tube rod, thereby injecting a slow-release drug solution injected from the inner tube inlet The position can be changed. If this method is used, for example, even if there are rocks or clay near the inner pipe inlet and it is difficult to inject the chemical, the inner pipe inlet can be moved to effectively infiltrate the chemical. Can be made. Thereby, a chemical | medical solution can be infiltrated and injected into the ground accurately and in a short time.

  Of the present invention, the second aspect relates to the chemical liquid injection method according to the first aspect, wherein a plurality of inner tube inlets provided at the tip of the inner tube rod are in a direction in which the inner tube rod is fed out. As seen from the above, they are provided at predetermined intervals.

  According to the present invention, since the inner tube inlet at the tip of the inner tube rod is provided at a predetermined interval, the slow-fixing chemical solution simultaneously injected from the inner tube rod is equally injected into the ground. be able to. Thereby, penetration into the ground can be made efficient.

  According to the third aspect of the present invention, there is provided a chemical liquid injection method according to the first or second aspect, wherein the slow-binding chemical liquid injection step is such that the distal end portion of the inner tube rod is located outside the outer tube rod. In a state where the predetermined length is delivered, a slow-binding chemical solution is injected from a plurality of inner tube inlets, and further, the inner tube rod is pulled up to a predetermined length in the direction of the outer tube rod, and then a plurality of inner tube injections are performed. A slow-binding chemical solution is injected from the inlet.

  A packer is formed by injecting a short-acting chemical solution from the inner tube inlet of the inner tube rod and the opening at the tip of the outer tube rod. According to the present invention, the tip of the inner tube rod is In a state where a predetermined length is delivered to the outside of the rod, a slow-binding chemical solution is injected from a plurality of inner tube inlets, and further, the inner tube rod is pulled up to a predetermined length in the direction of the outer tube rod, and then a plurality of Since the slow-binding chemical solution is injected from the inner tube injection port, the drug solution can be injected from the same inner tube injection port at multiple locations by moving the inner tube rod without the formed packer collapsing. . As a result, the amount of the slow-acting chemical solution injected from the inner tube inlet using the packer formed once can be increased, the penetration rate into the ground can be increased, and the working efficiency can be improved. .

According to a fourth aspect of the present invention, there is provided a chemical liquid injection method according to any one of the first to third aspects, wherein a plurality of inner tube inlets provided at the tip of the inner tube rod are The inner tube inlet arranged at the tip of the inner tube rod has a larger diameter.

  If the plurality of inlets are the same inlet, the injection pressure is lower toward the tip, so the amount of chemical injected into the tip provided at the tip of the inner tube rod is smaller. According to the invention, since the diameter of the inner tube inlet arranged at the tip of the inner tube rod is larger, the injection amount of the chemical solution from the inner tube inlet provided at the tip of the inner tube rod Can be increased. Thereby, for example, all the injection amounts of the plurality of inner tube inlets provided at the tip of the inner tube rod can be made the same.

  According to a fifth aspect of the present invention, there is provided a chemical liquid injection method according to any one of the first to fourth aspects, wherein the inner tube rod is connected to the outer tube after the slow-setting chemical liquid injection step is performed. Pulling into the rod, pulling up the inner tube rod and outer tube rod in the ground direction, and after pulling up a predetermined length by the injection tube lifting step, packer forming step, sending the inner tube rod again Performing a process and a slow-release drug solution injection process.

  According to the present invention, since the slow-acting chemical solution injection process is performed again after the slow-fixing chemical solution injection step is performed, the chemical solution is injected into the entire insertion hole in which the inner tube rod and the outer tube rod are inserted. Can do.

  According to a sixth aspect of the present invention, there is provided a chemical liquid injection method according to the first aspect, wherein after the packer forming process is performed, the instantaneous drug solution is injected by the inner tube rod feeding process. At the position, while feeding the distal end portion of the inner tube rod to the outside of the outer tube rod, a plurality of inner tube injections provided at the distal end portion of the inner tube rod fed by the inner tube rod feeding step by the slow-binding chemical solution injection step. It is characterized by injecting a slow-setting chemical solution from the inlet.

  According to the present invention, at the position where the instantaneous setting chemical solution is injected, the tip of the inner tube rod is sent to the outside of the outer tube rod while the tip of the inner tube rod is sent out by the inner tube rod feeding step. Since the slow-release chemical solution is injected from the provided inner tube inlet, a large amount of the slow-release chemical solution can be continuously injected into the ground.

  According to a seventh aspect of the present invention, there is provided an inner tube rod having a hollow inside and provided with a plurality of inner tube inlets in a longitudinal direction of the tip, and a liquid provided at an upper end portion of the inner tube rod. Connected with the liquid supply pipe of the liquid supplied from the supply source, the inner pipe swivel that supplies the liquid to the inner pipe passage formed inside the inner pipe rod, and the inner pipe rod can be inserted into the hollow interior, the tip An outer tube rod that is open, and is provided at the upper end of the outer tube rod, and is connected to a liquid supply tube of liquid supplied from a liquid supply source, and is connected to the outer circumferential surface of the inner tube rod and the inner circumferential surface of the outer tube rod. An outer tube swivel for supplying liquid to the outer tube passage formed between the inner tube rod and the outer tube rod, with the tip of the inner tube rod and the tip of the outer tube rod being in substantially the same position. In addition, the instantaneous setting liquid A is injected from the inner tube inlet communicating with the inner tube passage, and the outer tube passage The packer is formed by injecting the instantaneous setting liquid B from the opening provided at the tip of the communication outer tube passage, and a plurality of inner tube rods are provided at the tip of the inner tube rod through the packer. In addition, a slow-release drug solution is injected from the inner tube inlet.

  According to the present invention, while the tip of the inner tube rod and the tip of the outer tube rod are substantially at the same position, the instantaneous setting liquid A is injected from the inner tube inlet communicating with the inner tube passage, and the outer tube A packer is formed by injecting an instantaneous liquid medicine B from an opening provided at the tip of the outer tube passage in communication with the passage, and a plurality of inner tube rods are provided at the tip of the inner tube rod through the packer. Since the slow-release chemical solution is injected from the inner tube inlet, the receiving area of the ground into which the slow-release chemical solution is simultaneously injected from the inner tube inlet increases, and the penetration rate into the ground can be increased. While being able to do so, without changing the position of the packer formed by the instantaneous setting chemical solution, the distal end of the inner tube rod is sent to the outside of the outer tube rod, thereby injecting a slow-release drug solution injected from the inner tube inlet The position can be changed. Using this device, for example, even if there are rocks or clay near the inner pipe inlet and it is difficult to inject the chemical, the inner pipe inlet can be moved to effectively inject and penetrate the chemical. Can be made. Thereby, a chemical | medical solution can be infiltrated and injected into the ground accurately and in a short time.

  As described above, according to the chemical solution injection method of the present invention, the injection time of the chemical solution can be shortened, and the injection position of the slow-release chemical solution injected from the injection port can be set without moving the position of the packer. It can be changed freely.

It is a figure which shows the chemical injection system used for the chemical injection method in one Embodiment of this invention. (A) It is a side view of the inner tube | pipe rod used for the chemical | medical solution injection construction method. (B) It is a figure which shows the AA cross section. (C) It is a figure which shows a BB cross section. (A) It is a side view of the outer tube | pipe rod used for the chemical | medical solution injection construction method. (B) It is a figure which shows CC cross section. (C) It is a bottom view of the outer tube | pipe rod used for the chemical | medical solution injection | pouring method in one Embodiment of this invention. (A) It is a side view in the state where the inner tube rod was inserted inside the outer tube rod used for the chemical solution injection method. (B) It is a figure which shows DD cross section. (C) It is a figure which shows EE cross section. It is a flowchart which shows the construction procedure of the chemical injection method in one Embodiment of this invention. (A) It is a figure which shows the condition which is excavating with an outer tube | pipe rod. (B) It is a figure which shows the condition which inserted the inner tube | pipe rod in the outer tube | pipe rod. (C) It is a figure which shows the condition where the packer was formed near the front-end | tip of an inner tube | pipe rod, and the front-end | tip of an outer tube | pipe rod. (D) It is a figure which shows the state by which the front-end | tip of the inner pipe rod was sent out of the outer pipe rod. (E) It is a figure which shows the condition where a slow-fixing chemical | medical solution is inject | poured in the ground from the inner tube injection port of an inner tube rod. It is a flowchart which shows the construction procedure of the chemical injection method in 2nd Embodiment of this invention. (A) It is a side view of the inner tube | pipe rod used for the chemical | medical solution injection | pouring method in 3rd Embodiment of this invention. (B) It is a figure which shows the bottom view of the same inner pipe rod. It is a flowchart which shows the construction procedure of the chemical injection method in 3rd Embodiment of this invention. It is a figure which shows the state which has sent out the inner tube | pipe rod to the predetermined depth, inject | pouring the slow setting chemical | medical solution from the injection hole of an inner tube | pipe rod.

Hereinafter, an embodiment of a chemical injection method according to the present invention will be described with reference to the drawings. FIG. 1 shows a chemical solution injection system used in a chemical solution injection method according to an embodiment of the present invention.

  As shown in FIG. 1, the work machine 1 supports a double injection tube 4 composed of an inner tube rod 2 and an outer tube rod 3, and moves the inner tube rod 2 and the outer tube rod 3 up and down, rotates, and rocks, respectively. It is a machine to be moved. Specifically, the work machine 1 grips (holds) the outer tube rod 3 with the outer tube rod gripping portion 5 and grips (holds) the inner tube rod 2 with the inner tube rod gripping portion 6. As a result, the inner tube rod 2 and the outer tube rod 3 can rotate and swing as well as move up and down individually. In the present embodiment, the inner tube rod gripping portion 6 is provided. However, the present invention is not limited to this, and the inner tube rod gripping portion 6 is not provided, and the inner tube rod 2 is disposed on the inner periphery of the outer tube swivel 8b described later. You may make it hold (hold). Further, the inner tube rod gripping portion 6 shown in FIG. 1 is supported by the working machine 1 and the like at the rear.

  As will be described later, the inner tube rod 2 is hollow inside and is provided with an inner tube inlet 7 at the tip (see FIG. 2). As will be described later, the outer tube rod 3 is hollow inside and has an open end (see FIG. 3). Thereby, the inner tube rod 2 can be inserted into the outer tube rod 3. In the present embodiment, the inner tube inlet 7 is provided at the distal end portion of the inner tube rod 2. However, the present invention is not limited to this, and the inner tube injection is performed on the side surface portion of the inner tube rod 2 that is not the distal end portion of the inner tube rod 2. An inlet 7 may be provided. Here, the distal end portion of the inner tube rod 2 refers to the distal end portion of the inner tube rod 2 and includes the side surface near the distal end of the inner tube rod 2 and the distal end of the inner tube rod 2.

  A swivel 8 (an inner tube swivel 8a and an outer tube swivel 8b) is attached to the rear ends of the inner tube rod 2 and the outer tube rod 3, respectively. When excavating the ground with the outer tube rod 3, the inner tube rod 2 is not inserted into the outer tube rod 3, but a drilling swivel for excavation is attached to the upper portion of the outer tube rod 3 to excavate the ground. However, the illustration is omitted here.

  The swivel 8 (inner tube swivel 8a, outer tube swivel 8b) is supplied from a supply source (not shown) of a quick setting chemical solution, a supply source (not shown) of a slow setting chemical solution, a supply source (not shown) of water, respectively. Inner pipe provided in the double injection pipe 4 while being connected to the supply pipes for the instantaneous setting chemical liquid, slow setting chemical liquid, water, etc. The gas is supplied to the passage 9 and the outer pipe passage 10. As described above, a supply source (not shown) of an instantaneous setting chemical solution, a supply source (not shown) of a slow setting chemical solution, and an instantaneous setting solution (short setting chemical solution) supplied from a water supply source (not shown). A, instantaneous setting chemical solution B), slow setting chemical solution, and water are supplied from each supply source (not shown) → swivel 8 → each passage, and the inner tube inlet 7 and inner tube rod at the tip of the inner tube rod 2 2 and the outer tube rod 3 are injected into the ground through the opening 11. The number of supply pipes connected to the swivel 8 is respectively injected from the inner tube inlet 7 at the tip of the inner tube rod 2 and the opening 11 formed by the inner tube rod 2 and the outer tube rod 3. It is provided corresponding to the number of liquids. The excavation swivel (not shown) is connected to a water supply pipe supplied from a water supply source (not shown) and supplies water into the outer tube rod 3. Here, as will be described later, the instantaneous setting chemical liquid A and the instantaneous setting chemical liquid B are in a liquid state, but when the instantaneous setting chemical liquid A and the instantaneous setting chemical liquid B are mixed, , The chemical solution has the property of solidifying in seconds.

  In this way, the instantaneously connecting chemical solution is formed from the inner tube inlet 7 at the tip of the inner tube rod 2 and the opening 11 formed by the inner tube rod 2 and the outer tube rod 3 through the double injection tube 4. (Instantaneous drug solution A, Instantaneous drug solution B), slow drug solution, water, etc. are injected into the ground.

  Next, the inner tube rod used in the chemical solution injection method of the present invention will be described. Fig.2 (a) is a side view of the inner tube | pipe rod used for the chemical | medical solution injection | pouring method in one Embodiment of this invention, FIG.2 (b) is a figure which shows the AA cross section of Fig.2 (a). FIG. 2C is a view showing a cross section taken along the line B-B in FIG.

  As shown in FIG. 2, the inner tube rod 2 is hollow inside (outer diameter is about 30 mm) and circular in cross section (donut shape), and has an inner tube inlet 7 (first inner tube inlet 7a˜ A fourth inner pipe inlet 7d) is provided.

  Four inner tube inlets 7 are provided at a distal end portion of the inner tube rod 2 with a predetermined interval from the longitudinal direction (direction in which the inner tube rod 2 is fed) (see FIG. 2A). The first inner pipe inlet 7a (see FIG. 2 (b)) consisting of two inlets provided diagonally at the top, and rotated 90 degrees from the position of the first inner pipe inlet 7a at the lower part The second inner pipe inlet 7b (see FIG. 2 (c)), which is two inlets provided at the position, and two lower inlets provided at the same position as the first inner pipe inlet 7a. A third inner pipe inlet 7c (see FIG. 2 (b)) that serves as an inlet, and a fourth inner pipe inlet that comprises two inlets provided at the same position as the second inner pipe inlet 7b at the lower part thereof. 7d (see FIG. 2C) is provided. In the present embodiment, four inner pipe inlets 7 are provided. However, the present invention is not limited to this, and six or eight inner pipe inlets 7 may be provided, and a plurality of inner pipe inlets 7 may be provided. What is necessary is just to provide. Further, the inner tube rod 2 of the present embodiment has a cone-shaped tip. Thereby, the inner tube rod 2 is easily inserted into the ground.

  The inner tube inlet 7 has a larger diameter than the inner tube inlet 7 disposed at the tip of the inner tube rod 2. That is, in this embodiment, the first inner pipe inlet 7a (smaller diameter) → second inner pipe inlet 7b → third inner pipe inlet 7c → fourth inner pipe inlet 7d (larger diameter) in this order. The inlet diameter is increased. As a result, the injection pressure generally decreases toward the tip of the inner tube rod 2, so the amount of chemical injected from the injection port decreases as the size of the injection port is the same. In this embodiment, since the diameter of the inner tube inlet 7 arranged at the tip of the inner tube rod 2 is larger, the inner tube is injected from the inner tube inlet 7 provided at the tip of the inner tube rod 2. The amount of chemicals can be increased. Thereby, for example, all the injection amounts of the plurality of inner tube inlets 7 provided at the tip of the inner tube rod 2 can be made the same.

  Next, the outer tube rod 3 used in the chemical solution injection method of the present invention will be described. Fig.3 (a) is a side view of the outer tube | pipe rod used for the chemical | medical solution injection | pouring method in one Embodiment of this invention, FIG.3 (b) is a figure which shows CC cross section of Fig.3 (a). FIG. 3C is a bottom view of the outer tube rod used in the chemical injection method according to the embodiment of the present invention.

  As shown in FIG. 3, as described above, the outer tube rod 3 has a hollow inside (outside diameter of about 50 mm) and a circular cross section (a donut shape (see FIG. 3B)), and an open end. (See FIG. 3C). And the excavation blade 12 is provided in the front-end | tip of the outer tube | pipe rod 3, and the underground can be excavated when the excavation blade 13 rotates with the outer tube rod 3. FIG.

  Next, a state where the inner tube rod is inserted into the outer tube rod 3 used in the chemical solution injection method of the present invention will be described. Here, FIG. 4A is a side view of the state where the inner tube rod is inserted into the outer tube rod used in the chemical solution injection method, and FIG. FIG. 4C is a diagram showing a cross section taken along the line EE in FIG. 4A.

  As shown in FIG. 4, an inner tube guide check valve 13 attached to the inner tube rod 2 is provided at a position slightly above the tip of the outer tube rod 3 (FIGS. 4A and 4B). )reference). The inner tube guide check valve 13 guides the inner tube rod 2 inserted into the outer tube rod 3 so as to be near the center of the outer tube rod 3, and fluid (instantaneous drug solution, water, etc.) flows. It is a valve for stopping the flow from the distal end direction of the outer tube rod 3 to the reverse direction (G direction (see FIG. 4A)). Specifically, the inner pipe check valve 13 is made of rubber and has an inner diameter smaller than the outer diameter of the inner pipe rod 2 and an outer diameter of the outer pipe rod 3 attached to the inner pipe rod 2. It is formed with a size substantially the same as the inner diameter of. The outer diameter is formed in a taper shape with the upper surface portion slightly narrowed. Thus, since the outer peripheral surface of the inner pipe guiding check valve 13 is tapered, the liquid flowing through the outer pipe passage 10 can flow in the distal direction, but the reverse is less likely to flow. In the present embodiment, the inner tube rod 2 is guided to the vicinity of the center of the outer tube rod 3 by the inner tube guiding check valve 13, but the present invention is not limited to this. ), The position of guiding the inner tube rod 2 may be different. Thus, since the inner tube guide check valve 13 is provided, in the state where the inner tube rod 2 is inserted into the outer tube rod 3, the center of the inner tube rod 2 and the center of the outer tube rod 3 are located at that position. They are almost the same (see FIG. 4B).

  As shown in FIG. 4A, the first inner tube of the inner tube rod 2 is determined from the distance (GS) from the position on the distal end side of the outer tube rod 3 of the inner tube guiding check valve 13 to the distal end of the outer tube rod 3. The distance (TS) from the inlet 7a to the tip of the inner tube rod 2 (the distance from the farthest outer periphery of the first inner tube inlet 7a to the tip of the inner tube rod 2) is made shorter. As a result, in the state where the tip of the inner tube rod 2 and the tip of the outer tube rod 3 are substantially the same, the outer tube passage 10 formed by the inner circumferential surface of the outer tube rod 3 and the outer circumferential surface of the inner tube rod 2 is instantaneously connected. By flowing the conjunctive chemical B and the instantaneous concomitant chemical B through the inner tube passage 9 inside the inner tube rod 2, the instantaneous drug solution B in the outer tube passage 10 and the inner tube inlet 7 of the inner tube rod 2 are flown. From the inner tube guide check valve 13 (at the tip of the outer tube rod 3) to the tip of the outer tube rod 3, and the mixed fluid is mixed into the outer tube passage. 10 is discharged to the outside through the opening 11 at the tip. Further, in the present embodiment, the first inner pipe inlet 7a to the fourth inner pipe inlet 7d are alternately provided alternately, so that the instantaneous setting chemical solution B and the inner pipe rod 2 in the outer pipe passage 10 are provided. Instantaneous drug solution A injected from the tube inlet 7 is further easily mixed from the inner tube guide check valve 13 (at the distal end side of the outer tube rod 3) to the distal end of the outer tube rod 3.

  Next, the construction procedure by the chemical injection method according to one embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a flowchart showing a construction procedure of the chemical solution injection method according to one embodiment of the present invention, and FIG. 6A is a diagram showing a situation where excavation is performed by an outer tube rod.

  First, in S1, the outer tube rod 3 is positioned at a position to be excavated (chemical solution injection). Specifically, the outer tube rod 3 is suspended by a crane, the outer tube rod 3 is gripped by the outer tube rod gripping portion 5 of the work machine 1, and the outer tube rod 3 is positioned where it will be excavated (chemical solution injection). . And if the outer tube | pipe rod 3 is positioned in the predetermined position which excavates from now, it will progress to S2. In this embodiment, the outer tube rod 3 is suspended and positioned by a crane. However, the present invention is not limited to this, and the operator manually holds the outer tube rod 3 by the outer tube rod gripping portion 5 of the work machine 1. You may position.

In S2, the ground is excavated downward while rotating the outer tube rod 3. Specifically, the outer tube rod 3 is moved by the outer tube rod gripping portion 5 of the work machine 1 while water is discharged from the tip of the outer tube rod 3 through a drilling swivel (not shown) from a water supply source (not shown). Rotate and move into the ground. As a result, the ground is excavated by the excavating blade 12 at the tip of the outer tube rod 3.

  In S3, it is determined whether or not the outer tube rod 3 has been excavated to a desired depth in the ground, and if it has not been excavated to the desired depth yet, it is determined “NO”. Done. Then, if it is determined in S3 that the outer tube rod 3 has been excavated to a desired depth, “YES” is determined, and the excavation is completed, and the process proceeds to S4 (see FIG. 6A). Here, FIG. 6A is a diagram illustrating a situation where excavation is performed by the outer tube rod 3.

  By S4, the inner tube rod 2 is inserted into the outer tube rod 3 (injection tube insertion step). Specifically, the inner tube rod 2 is suspended by a crane, and the inner tube rod 2 is inserted into the outer tube rod 3 (see FIG. 6B). Here, FIG. 6B is a diagram illustrating a state in which the inner tube rod 2 is inserted into the outer tube rod 3. In this embodiment, the inner tube rod 2 is suspended by a crane and inserted into the outer tube rod 3. However, the present invention is not limited to this, and the operator manually inserts the inner tube rod 2 into the outer tube rod 3. May be. In this way, the double injection tube 4 composed of the inner tube rod 2 and the outer tube rod 3 is inserted into the ground. Here, the injection tube insertion step is performed by excavating with the outer tube rod 3 and then inserting the inner tube rod 2 into the outer tube rod 3 as in this embodiment. This includes the case where the outer tube rod 3 and the inner tube rod 2 are inserted into the excavated hole. The excavation process is configured by the processing from S1 to S4. In the present embodiment, first, the outer tube rod 3 is excavated in advance to a position where the chemical solution is to be injected, and then the outer tube rod 3 is slightly lifted to the upper part, and then the inner tube rod 2 is lifted slightly. However, the present invention is not limited to this, and the outer tube rod 3 is excavated to the position where the chemical solution is to be injected in advance, and the inner tube rod 2 is not lifted up. May be inserted into the outer tube rod 3.

  In S5, in a predetermined position in the ground, the inner tube passage 9 formed inside the inner tube rod 2 with the tip of the inner tube rod 2 and the tip of the outer tube rod 3 being substantially in the same position, Through the inner tube injection port 7 provided in the inner tube rod 2, the instantaneous setting drug solution A is injected and through the outer tube passage 10 formed from the outer side of the inner tube rod 2 and the inner side of the outer tube rod 3. Instantaneous drug solution B is injected from opening 11 provided at the tip of outer tube rod 3 (packer forming step (see FIG. 6C)). The predetermined position in the ground is a predetermined position in the hole excavated by the outer tube rod 3, and in this embodiment, a position slightly lifted from the deepest position of the hole excavated by the outer tube rod 3. It is. Here, FIG. 6C is a diagram showing a situation where packers are formed near the tip of the inner tube rod 2 and near the tip of the outer tube rod 3. Moreover, the instantaneous setting chemical solution means a chemical solution that solidifies in seconds (the gel time is in seconds). By mixing the instantaneous setting chemical solution A and the instantaneous setting chemical solution B, the chemical solution is solidified in seconds. Is done. The solidified chemical solution seals the tip of the inner tube rod 2 and the tip of the outer tube rod 3 and its peripheral portion, thereby completing the packer. By this packer, it is possible to effectively prevent the chemical solution injected from the inner tube inlet 7 of the inner tube rod 2 described later from leaking to the ground. Then, the process proceeds to S6.

  By S6, the distal end portion of the inner tube rod 2 is fed out of the outer tube rod 3 without moving the outer tube rod 3 (inner tube rod feeding step). Specifically, the inner tube rod 2 is fed out of the outer tube rod 3 to a predetermined depth by penetrating the packer with the inner tube rod 2 at the position where the instantaneous setting chemical solution is injected by the packer forming step ( (Refer FIG.6 (d)). Here, FIG.6 (d) is a figure which shows the state by which the front-end | tip of the inner tube | pipe rod was sent out to the exterior of an outer tube | pipe rod. The predetermined depth at which the inner tube rod 2 is delivered is an arbitrary depth at which the chemical solution is to be injected from the inner tube inlet 7 of the inner tube rod 2, and in particular, all inner tube injections of the inner tube rod 2 are performed. It is preferable that the inlet 7 has a depth sent to the outside of the outer tube rod 3. Then, the process proceeds to S7. In the present embodiment, in S4, the outer tube rod 3 is excavated in advance to the position where the chemical solution is to be injected, and then the outer tube rod 3 is slightly lifted upward, and the packer is lifted slightly. The inner tube rod 2 is fed out of the outer tube rod 3. In this way, the outer tube rod 3 is pulled up a little and the inner tube rod 2 is fed out of the outer tube rod 3 at that position, so the inner tube rod is already drilled by the outer tube rod 3 and the ground is loosened. 2 is sent out and the inner tube rod 2 is easily sent out.

  In S7, a slow-binding chemical solution is injected into the ground from the inner-tube inlet 7 of the inner-tube rod 2 sent to a predetermined depth by the inner-tube rod sending step (slow-fixing chemical solution injection step (FIG. 6 (e )reference)). Here, FIG.6 (e) is a figure which shows the condition where a slow-binding chemical | medical solution is inject | poured in the ground from the inner tube injection port of an inner tube | pipe rod. Since this slow-acting chemical solution requires several tens of minutes or more until it is solidified, the slow-acting chemical solution injected from the four inner tube inlets 7 spreads in a spherical shape while being permeated in a radial pattern. In the present embodiment, the inner tube inlet 7 provided in the inner tube rod 2 is provided at a predetermined interval, so that the slow-release chemical solution injected simultaneously from the inner tube inlet 7 is evenly distributed. Can be injected into the ground. In this embodiment, since the diameter of the inner tube inlet 7 arranged at the tip of the inner tube rod 2 is larger, a large amount of chemical solution is also delivered at the inner tube inlet 7 provided at the tip of the inner tube rod 2. Can be injected. And the slow-release chemical solution that has been infiltrated radially from each inner tube inlet 7 and spread in a spherical shape can solidify after several tens of minutes, thereby strengthening the ground. Then, the process proceeds to S8.

  In S8, it is determined whether or not the chemical injection has been completed. If the chemical injection has not been completed, “NO” is determined in S8, and in S9, the inner tube rod 2 is drawn into the outer tube rod 3, and the inner tube rod 2 and the outer tube rod 3 are moved in the ground direction. Pulled up (injection tube pulling process). And after raising to the position which is going to perform chemical | medical solution injection | pouring, the process of S5-> S6-> S7 is further performed. If the chemical liquid injection is completed in S8, “YES” is determined in S8, and the chemical liquid injection process ends. By doing in this way, a chemical | medical solution can be inject | poured into the whole insertion hole in which the inner tube | pipe rod 2 and the outer tube | pipe rod 3 were inserted. In this embodiment, the inner tube rod 2 is drawn into the outer tube rod 3 and the inner tube rod 2 and the outer tube rod 3 are pulled up in the ground direction. After pulling up the tube rod 3 in the ground direction, the inner tube rod 2 may be pulled into the outer tube rod 3.

  As described above, according to the present invention, the tip of the inner tube rod 2 is fed out of the outer tube rod 3 at the position where the packer is formed by the packer forming step, and a plurality of pieces are formed on the tip of the inner tube rod 2. Since the slow-binding chemical solution is injected from the provided inner pipe injection port 7, the receiving area of the ground into which the slow-release chemical solution is simultaneously injected from the inner tube rod 2 is increased, and the penetration rate into the ground is increased. In addition, since the tip of the inner tube rod 2 is fed out of the outer tube rod 3 without changing the position of the packer formed by the instantaneous setting chemical solution, It is possible to change the injection position of the caustic chemical solution, for example, by moving the position of the inner tube injection port even in places where there are rocks or clay near the inner tube injection port 7 and it is difficult to inject the chemical solution, Effective injection and penetration of chemicals Can.

  Next, a second embodiment of the chemical injection method according to the present invention will be described with reference to the drawings. Here, the difference between the second embodiment and the first embodiment of the present invention is that, in the first embodiment, after the slow chemical solution injection step, the inner tube rod 2 is moved to the position where the next chemical solution injection is to be performed. The outer tube rod 3 is pulled up, and a packer is formed again at that position (S5). The inner tube rod 2 is sent to the outside of the outer tube rod 3 (S6), and loosened from the inner tube inlet 7 of the inner tube rod 2. In the second embodiment, after the slow chemical solution injection step, the outer tube rod 3 is left as it is, and only the inner tube rod 2 is pulled up to the ground, and then the chemical solution is injected. After being pulled up to the intended position, a slow-binding chemical solution is injected into the ground from the inner tube inlet 7 of the inner tube rod 2. FIG. 7 is a flowchart showing a construction procedure of the chemical solution injection method according to the second embodiment of the present invention. In addition, about the thing of the same structure as 1st Embodiment, the same code | symbol is used and it shall have the same effect, and description is abbreviate | omitted. In the present embodiment, the description will be focused on the differences from the first embodiment.

  In S7, a slow-binding chemical solution is injected into the ground from the inner tube inlet 7 of the inner tube rod 2 fed to a predetermined depth (slow-binding chemical solution injection step). Then, the process proceeds to S82.

  In S82, it is determined whether the chemical injection is completed. If the chemical liquid injection has not been completed, “NO” is determined in S82, and the inner tube rod 2 is pulled up in the ground direction in S92 (inner tube rod pulling step). Then, after the inner tube rod 2 is pulled up to the position where the chemical solution is to be injected next, the process of S7 (slow-binding chemical solution injection step) is performed. If the chemical liquid injection is completed in S82, “YES” is determined in S82, and the chemical liquid injection process ends. In this way, after the chemical solution is injected, the inner tube rod 2 is pulled up in the direction of the outer tube rod 3, and the slow-binding drug solution is injected from the plurality of inner tube injection ports 7, so that a wide range without forming a packer again. You can inject a chemical solution. As a result, a slow-acting chemical solution is injected over a wide area using the packer formed once, the penetration rate into the ground can be increased, and work efficiency can also be improved. In addition, the inner tube rod pulling-up process of the present embodiment is included in the slow-fixing chemical liquid injection process and constitutes a part of the slow-fixing chemical liquid injection process.

  Next, a third embodiment of the chemical injection method according to the present invention will be described with reference to the drawings. Here, the difference between the third embodiment of the present invention and the first embodiment is that, in the first embodiment, after the slow-fixing chemical solution injection step, the inner tube rod 2 is moved to the position where the next chemical solution injection is to be performed. The outer tube rod 3 is pulled up, and a packer is formed again at that position (S5). The inner tube rod 2 is sent to the outside of the outer tube rod 3 (S6), and loosened from the inner tube inlet 7 of the inner tube rod 2. However, in the third embodiment, after the packer is formed, the inner tube rod 2 excavates the ground to a predetermined depth while injecting the slow-acting chemical solution, and then reaches the predetermined depth. After the excavation, the inner tube rod 2 is pulled up in the ground direction while injecting the chemical solution. Here, Fig.8 (a) is a side view of the inner tube | pipe rod used for the chemical | medical solution injection | pouring method in 3rd Embodiment of this invention, FIG.8 (b) is a figure which shows the bottom view of the same inner tube | pipe rod. It is.

  As shown in FIG. 8, the inner tube rod 2 used in the chemical solution injection process of the present embodiment is provided with a distal end inner tube inlet 14 at the distal end (see FIG. 8B). The distal end inner tube inlet 14 communicates with the inner tube passage 9 in the inner tube rod 2, and the same liquid as the inner tube inlet 7 is also injected from the distal inner tube inlet 14 (see FIG. 8A). ). In the third embodiment, the tip excavating blade 100 is provided at the tip of the inner tube rod 2. The tip excavating blade 100 facilitates excavation of the ground by the inner tube rod 2 (see FIG. 8A). In the first embodiment and the second embodiment, the inner tube rod 2 without the distal inner tube inlet 14 and the distal excavation blade 100 is used. However, the present invention is not limited to this, and the first embodiment and the second embodiment. However, as in the third embodiment, the inner tube rod 2 provided with either the distal inner tube inlet 14 and the distal digging blade 100 or the distal inner tube inlet 14 and the distal digging blade 100 may be used. Thereby, it becomes easy to send the inner tube rod 2 out of the outer tube rod 3.

  The construction procedure by the chemical injection method according to the third embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a flowchart showing the construction procedure of the chemical solution injection method according to the third embodiment of the present invention, and FIG. 10 shows the inner tube up to a predetermined depth while injecting the slow-binding chemical solution from the injection port of the inner tube rod. It is a figure which shows the state which has sent out the rod. In addition, about the thing of the same structure as 1st Embodiment, the same code | symbol is used and it shall have the same effect, and description is abbreviate | omitted. In the present embodiment, the description will be focused on the differences from the first embodiment.

  By S4, the inner tube rod 2 is inserted into the outer tube rod 3 (injection tube insertion step). Then, the process proceeds to S53.

  In S53, the inner tube inlet 7 and the distal end provided in the inner tube rod 2 with the distal end portion of the inner tube rod 2 and the distal end portion of the outer tube rod 3 at substantially the same position at a predetermined position in the ground. Instantaneous drug solution A is injected from inner tube inlet 14 and instantaneous drug solution B is injected from opening 11 provided at the tip of outer tube rod 3 (packer forming step). Then, the process proceeds to S63.

  In S63, the distal end portion of the inner tube rod 2 is moved to the outer tube rod 2 while the loose tuber is injected from the inner tube inlet 14 and the inner tube inlet 7 of the inner tube rod 2 without moving the outer tube rod 3. Then, the ground is excavated by the inner tube rod 2 (inner tube rod feeding step, slow-binding chemical solution injection step). Specifically, the packer is penetrated by the inner tube rod 2 at the position where the instantaneous setting chemical solution is injected by the packer forming step, and is loosened from the distal inner tube inlet 14 and the inner tube inlet 7 of the inner tube rod 2. The inner tube rod 2 is sent out to a predetermined depth while injecting the caustic solution (see FIG. 10). By doing in this way, it becomes easy to excavate the ground from the slow-fixing chemical solution injected from the tip inner tube inlet 14 of the inner tube rod 2, and the chemical solution can be injected over a wide area in the ground. . In this embodiment, the inner tube rod 2 is excavated by the inner tube rod 2 without rotating, but the present invention is not limited to this, and the inner tube rod 2 is lowered while the inner tube rod 2 is rotated to excavate the ground. May be. In this way, if the inner tube rod 2 is rotated and excavated by the inner tube rod 2, the surrounding ground is slightly loosened and the chemical solution is likely to penetrate, and the inner tube rod 2 is further easily excavated. . Then, the process proceeds to S73. In the first embodiment and the second embodiment, the inner tube rod 2 is sent out without rotating the inner tube rod 2, but the present invention is not limited to this, and the inner tube rod 2 is fed out while rotating the inner tube rod 2. May be. By doing so, the surrounding ground is slightly loosened, and the chemical solution is easy to penetrate, and the inner tube rod 2 is easily fed into the ground.

  By S73, it is determined whether the inner tube rod 2 has been sent out to a predetermined depth. If it is not sent to a predetermined depth, it is determined as NO, and the process of S73 → S63 → S73 is performed until the inner tube rod 2 is sent to a predetermined depth, and the inner tube rod 2 is sent to a predetermined depth. If it is determined, YES is determined in S73 and the process proceeds to S83.

  In S83, when the inner tube rod 2 is fed to a predetermined depth by the inner tube rod lowering chemical injection step, the inner tube rod 2 is pulled in the direction in which the inner tube rod 2 is drawn into the outer tube rod 3 (inner tube rod 2). Tube rod pull-up process, slow-setting chemical solution injection process). Specifically, without moving the outer tube rod 3, the inner tube rod 2 is pulled up while injecting a slow-binding chemical solution from the distal inner tube inlet 14 and the inner tube inlet 7 of the inner tube rod 2. Then, the process proceeds to S93.

  By S93, it is determined whether the tip of the inner tube rod 2 has been pulled up to the inside of the outer tube rod 3. And when it is not pulled up to the inside of the outer tube rod 3, it is judged as NO, the processing of S93 → S83 → S93 is performed until the inner tube rod 2 is sent out to a predetermined depth, and the inner tube rod 2 is moved to the outer tube. When it is pulled up to the inside of the rod 3, YES is determined in S93, and the chemical injection process is ended.

  In this way, the inner tube rod lowering chemical solution injection step allows the slow tuber chemical solution to be injected from each injection port (the inner tube injection port 7 and the four inner tube injection ports 7) while lowering the inner tube rod 2, while the inner tube rod 2 is lowered. As the tube rod 2 is raised, the slow-binding chemical solution is injected from each of the injection ports (the inner tube injection port 7 and the four inner tube injection ports 7), so that a large amount of the slow-binding chemical solution can be injected into the ground. . As a result, the slow-acting chemical solution that has been injected into the ground in a large amount from each injection port is solidified several tens of minutes later, and the inside of the ground can be strengthened.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Next, a modified example of the present invention will be described.

(1) In the present embodiment (the first to third embodiments), the outer tube rod 3 and the inner tube rod 2 are lowered into the ground without being vibrated. An outer tube rod vibration device (not shown) that vibrates the outer tube rod 3 is provided, and an inner tube rod vibration device (not shown) that vibrates the inner tube rod 2 is provided on the upper portion of the inner tube rod gripping portion 6. The tube rod 3 and the inner tube rod 2 may be lowered into the ground while individually vibrating. By doing so, for example, in the process of S2, the outer tube rod 3 is rotated while being vibrated, so that the outer tube rod 3 is easily excavated. Also in the process of S6, since the inner tube rod 2 is vibrated and sent out to the outside of the outer tube rod 3, the surrounding ground is slightly loosened so that the chemical solution can easily permeate, and the inner tube rod 2 is fed into the ground. It becomes easy to be. Further, in the process of S63, since the excavation is performed while vibrating the inner pipe rod 2, the surrounding ground is slightly loosened and the chemical solution is likely to penetrate, and the inner pipe rod 2 is easily excavated in the ground. Further, it is not always necessary to provide both the outer tube rod vibration device (not shown) and the inner tube rod vibration device (not shown), only the outer tube rod vibration device (not shown) or the inner tube rod vibration device (not shown). (Not shown) may be provided, or a rod vibration device (not shown) for vibrating the outer tube rod 3 and the inner tube rod 2 with one vibration device may be provided.

(2) In the present embodiment (first embodiment to third embodiment), the pressure of the liquid flowing in the inner pipe passage 9 and the pressure of the liquid flowing in the outer pipe flow path 10 is not detected. The pump pressure of the supply pump of the chemical solution, slow-release chemical solution, water, etc.) may be detected by the pump pressure detecting means. By doing so, when the pump pressure detected by the pump pressure detecting means is high, the inner tube rod 2 injecting the slow-acting chemical solution is moved up and down to position the inner tube inlet 7. Can be shifted. Thereby, for example, even if the periphery of the inner tube injection port 7 is a place where it is difficult to inject the slowing chemical solution such as a clay layer, the inner tube rod 2 is moved up and down to inject the slowing chemical solution. The inner tube inlet 7 can be moved to an easy place.

(3) In this embodiment (the first embodiment to the third embodiment), the outer tube rod 3 having a hollow cylindrical shape is used. However, the outer tube rod 3 has a hollow arc shape, and the inner tube rod 2 is moved to the outside. You may comprise from the flexible member which can deform | transform following the bending of the tube rod 3. FIG. By doing in this way, a chemical | medical solution can be inject | poured using the shape of the arc-shaped outer tube | rod rod 3 also in the place where a chemical | medical solution is hard to be inject | poured.

(4) In the present embodiment, the mode in which the outer tube rod 3 and the inner tube rod 2 are inserted in the vertical direction in the ground has been described. However, the present invention is not limited thereto, and the outer tube rod 3 and the inner tube rod are horizontally or obliquely inserted. 2 may be inserted.

DESCRIPTION OF SYMBOLS 1 Working machine 2 Inner tube rod 3 Outer tube rod 4 Double injection tube 5 Outer tube rod gripping part 6 Inner tube rod holding part 7 Inner tube injection port 7a First inner tube injection port 7b Second inner tube injection port 7c Third Inner pipe inlet 7d Fourth inner pipe inlet 8 Swivel 8a Inner pipe swivel 8b Outer pipe swivel 9 Inner pipe passage 10 Outer pipe passage 11 Opening 12 Drilling blade 13 Inner pipe guiding check valve 14 End inner pipe inlet

Claims (7)

Using an inner tube rod that is hollow inside and has an inlet at the tip, and an inner tube rod that can be inserted into the hollow inside and an outer tube rod that opens at the tip, the drug solution is injected into the ground. A chemical injection method,
An injection tube insertion step of inserting a double injection tube composed of the inner tube rod and the outer tube rod into the ground,
In a predetermined position in the ground, the inner tube rod communicates with an inner tube passage formed inside the inner tube rod, with the tip of the inner tube rod and the tip of the outer tube rod being substantially at the same position. Injecting the instantaneous drug solution A from a plurality of inner tube inlets provided at the tip of the tube and communicating with the outer tube passage formed by the outer peripheral surface of the inner tube rod and the inner peripheral surface of the outer tube rod A packer forming step of injecting the instantaneous setting chemical B from the opening provided at the tip of the outer tube rod;
An inner tube rod feeding step of feeding the tip of the inner tube rod to the outside of the outer tube rod at the position where the instantaneous setting chemical solution is injected by the packer forming step;
A slow-release chemical solution injection step of injecting a slow-release chemical solution from a plurality of the inner tube inlets provided at the tip of the inner tube rod sent out by the inner tube rod delivery step;
Chemical solution injection method with   2. The plurality of inner tube inlets provided at the distal end portion of the inner tube rod are provided at predetermined intervals as viewed from the direction in which the inner tube rod is sent out. The chemical injection method described. The slow-fixing chemical solution injection step includes:
With the distal end portion of the inner tube rod being fed out to the outside of the outer tube rod by a predetermined length, a loosening chemical solution is injected from a plurality of the inner tube inlets, and the inner tube rod is further removed from the outer tube rod. 3. The chemical solution injection method according to claim 1 or 2, wherein a slow-binding chemical solution is injected from a plurality of the inner tube injection ports after being pulled up by a predetermined length in the tube rod direction.   The inner tube inlet provided in plural at the tip of the inner tube rod has a larger diameter of the inner tube inlet arranged at the tip of the inner tube rod. The chemical injection method according to any one of the above. After the slow-binding chemical solution injection step is performed, an injection tube pulling step of pulling the inner tube rod into the outer tube rod and pulling the inner tube rod and the outer tube rod in the ground direction;
5. The method according to claim 1, wherein the packer forming step, the inner tube rod feeding step, and the slow-binding chemical solution injection step are performed again after being pulled up by a predetermined length by the injection tube pulling step. The chemical injection method according to any one of the above. After the packer forming process is performed,
While sending the tip of the inner tube rod to the outside of the outer tube rod at the position where the instantaneous drug solution is injected by the inner tube rod feeding step,
The slow-binding chemical solution is injected from the plurality of inner tube inlets provided at the distal end portion of the inner tube rod sent out by the inner tube rod feeding step in the slow-binding chemical solution injection step. Item 1. A chemical injection method according to Item 1. A chemical solution injection device that injects a chemical solution in the ground, the chemical solution solidifies in the ground, and strengthens the ground,
An inner tube rod that is hollow inside and has a plurality of inner tube inlets in the longitudinal direction of the tip, and
An inner tube swivel provided at an upper end of the inner tube rod, connected to a liquid supply tube of liquid supplied from a liquid supply source, and supplying liquid to an inner tube passage formed inside the inner tube rod;
The inner tube rod can be inserted into a hollow interior, and an outer tube rod whose tip is open;
An outer tube formed at an upper end of the outer tube rod, connected to a liquid supply tube of liquid supplied from a liquid supply source, and formed between an outer peripheral surface of the inner tube rod and an inner peripheral surface of the outer tube rod; An outer tube swivel for supplying liquid to the tube passage,
The inner tube rod and the outer tube rod are instantly connected from the inner tube inlet communicating with the inner tube passage in a state where the tip of the inner tube rod and the tip of the outer tube rod are substantially at the same position. A is injected, and a packer is formed by injecting a short-acting drug solution B from an opening provided at the tip of the outer tube passage in communication with the outer tube passage,
The inner tube rod penetrates the packer, and a slow-binding medicinal solution is injected from a plurality of inner tube inlets provided at the tip of the inner tube rod.

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