JP2010156172A - Injection pipe device and grouting construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection pipe device and a grouting construction method for significantly simplifying an injection process substantially reducing construction cost. <P>SOLUTION: An outer pipe packer is a water-impermeable expansion and contraction packer and is expanded by a fluid filled in the outer pipe packer via an injection inner pipe from an outer-pipe-packer-inside discharge opening which is covered with a check valve and is provided on the pipe wall of an injection outer pipe in the outer pipe packer. The inner pipe has a plurality of inner pipe packers, while a pipe wall in the inner pipe packer has pipe-packer-inside discharge opening. Also, inner pipe discharge openings are provided in the inner-pipe pipe-wall among the plurality of inner pipe packers. The plurality of inner pipe packers are loosely inserted in the outer pipe in such a way as to be positioned on both sides of the outer-pipe-inside discharge opening. By feeding the fluid into the injection inner pipe, the fluid is filled in the outer pipe packer through the space between the inner pipe packers to form the outer pipe packer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention inserts an injection outer pipe having at least one packer, particularly a plurality of outer pipe packers, at intervals in a borehole in the ground, and between the borehole wall between the packers and the injection pipe. The present invention relates to an injection pipe device for injecting an injection material into the ground from an inner pipe having a packer in a plurality of inner pipes inserted into the outer pipe through a space, and formation of the inner pipe packer and formation of the outer pipe packer. Or the formation of the outer tube packer and the injection of the injection solution from the outer tube injection port, or the formation of the inner tube packer and the formation of the outer tube packer by feeding the inner tube injection solution. By automatically injecting the injection solution from the outer tube inlet, the injection process can be greatly simplified, or the hole diameter can be reduced by reducing the hole diameter of the injection tube, greatly increasing the construction cost. The injection tube device can be reduced to On the fine soil injection method.

  When the ground to be injected is alluvium, the hydraulic conductivity is usually larger in the horizontal direction than in the vertical direction. In injecting injection material into such ground and consolidating the ground, conventionally, a plurality of bag bodies forming a bag packer are attached to the injection pipe tube wall at intervals, and the inside and upper and lower sides of the bag body Using an injection tube device having a discharge port that opens between adjacent bag bodies, insert this injection tube device into a drilling hole provided in the ground, and then from the discharge port that opens inside the bag body A technology is adopted in which a bag material is filled in a bag body and inflated to form a bag packer, and the ground is consolidated by injecting an injection material from a discharge port that opens between adjacent bag bodies vertically. It was.

  In addition, a method for injecting an injection solution from an outer tube by simultaneously performing liquid feeding to an inner tube injection tube and formation of an inner tube packer using a double injection tube is already known by the present applicant. In the above-mentioned known technology, the gap formed between the injection tube and the hole-drilling wall is blocked by the bag packer adjacent to the upper and lower sides to form an independent space between the bag packers, and the injection material is passed through this space. It is injected into the ground.

For example, in the case of prior application No. 3509744 filed by the present applicant, the inner tube 6 is first inserted into the outer tube 2 and the outer tube packer 3 is filled with the consolidated material 7 to form the outer tube packer body 20. Thereafter, the injection solution 7 is injected into the ground 23 through the outer tube injection port 16 into the outer tube outer space 22 formed by the upper and lower outer tube packer bodies. The inner tube packer 8 is press-fitted into an inner tube packer of an inflatable / decompressible rubber bag through an elastic body such as synthetic rubber or a packer fluid line provided in the inner tube to form the inner tube packer 8. .

  However, in the above injection, the process of forming the packer body of the outer tube and the injection of the injection solution from the inner tube into the ground are performed separately. Further, forming the inner tube packer by providing the flow path of the packer fluid in the inner tube increases the inner tube diameter, and therefore increases the outer tube diameter and the drilling hole diameter. Moreover, both of these require a long construction period and high construction costs.

Further, according to prior application No. 4034305 according to the present application, the outer tube packer is formed in advance, and then the packer is formed and injected into the inner tube at the same time. This increases the number of processes. Therefore, further simplicity and shortening of the construction period have been desired.
Japanese Patent No. 3509744 Patent No. 4034305

  Therefore, the problem to be solved by the present invention is to automatically form the inner tube packer and the outer tube packer, or automatically form the outer tube packer and inject the injection liquid from the outer tube inlet. Alternatively, the injection process is dramatically simplified by automatically forming the inner tube packer and the outer tube packer and injecting the injection solution from the outer tube injection port by feeding the inner tube injection solution, or By reducing the hole diameter of the injection pipe, it is possible to reduce the drilling diameter and significantly reduce the construction cost. The injection pipe apparatus, the outer pipe packer forming method, and the ground injection construction method have improved the disadvantages of the above-mentioned known techniques. I will provide a.

  In order to solve the above-described problems, according to the injection tube device of the present invention, the injection solution is injected into the ground from the injection outer tube having the outer tube packer installed in the drilling hole in the ground through the injection inner tube into the ground. In the injection pipe device for injecting from the inlet, the outer pipe packer is a water-impermeable expansion / contraction packer, and the outer pipe packer is covered with a check valve provided on the pipe wall of the injection outer pipe in the outer pipe packer. The inner tube is expanded by the fluid filled in the outer tube packer through the injection inner tube, the inner tube has a plurality of inner tube packers, and the inner wall packer has a wall inside the inner tube packer. The inner tube wall between the plurality of inner tube packers has an inner tube discharge port, and the plurality of inner tube packers are loosely inserted into the outer tube so as to sandwich the outer tube discharge port. By inserting and feeding the fluid into the injection inner tube, the fluid is filled into the outer tube packer from the space between the inner tube packers. And forming a tubular packer body.

  Furthermore, in order to solve the above-mentioned problem, according to the ground injection method of the present invention, the injection solution is injected from the outer tube injection port into the ground through the injection inner tube into the injection outer tube installed in the ground drilling hole. In the ground injection construction method, the injection outer pipe is attached with one or a plurality of stretchable outer pipe packers forming an outer pipe packer body on the outer pipe wall, and below the outer pipe packer. Alternatively, the outer tube packer adjacent to the upper and lower sides is provided with an outer tube injection port, and the outer tube packer is provided with a discharge port covered with a check valve that opens into the outer tube packer, and is inserted into the outer tube. The tube is provided with a plurality of elastic inner tube bag bodies that form a plurality of inner tube packers across the discharge port between the inner tube packers, and is discharged from the inner tube bag discharge port by feeding fluid to the inner tube. The inner tube bag body is expanded by the fluid pressure of the fluid to form an inner tube packer. Fluid is filled into the outer tube packer from the outer tube packer discharge opening through the inner tube packer between space formed me in, characterized in that the outer tube packer body is formed.

  Furthermore, in order to solve the above-described problems, according to the ground injection method of the present invention, the inner surface of the inflatable structure is expanded from the outer surface of the injection outer tube having a water-impermeable and expandable outer tube packer installed in the drilling hole in the ground. In a ground injection method for injecting an injection solution into a ground through an injection inner pipe having a plurality of pipe packers, the outer pipe wall has one or a plurality of outer pipe injection ports, and a plurality of injection inner pipes adjacent to each other in the outer pipe A plurality of inner tube packers are positioned so as to sandwich the discharge ports in the outer tube packer, and the outer tube packer is provided with discharge ports in the outer tube packer having check valves, and the plurality of outer tubes The outer tube wall between the packers is provided with an inlet between outer tube packers having a check valve. The fluid is fed into the inner tube to expand the inner tube packer, and then the inner tube packer is discharged. From the outlet through the outlet in the outer tube packer, it flows into the upper and lower outer tube packers to form the outer tube packer body. Further characterized in that injecting an injection fluid from the outer tube inlet opening between the outer tube packer body.

  Furthermore, in order to solve the above-mentioned problem, according to the ground injection method of the present invention, the injecting inner tube is positioned such that a plurality of inflatable inner tube packers sandwich the outer tube packer inner / outer tube discharge port, Further, the inner tube packer has an inner tube discharge port in the inner tube packer, and an inner tube having an inner tube discharge port communicating with the outer tube discharge port between the inner tube packers provided at the intervals. The tube is used to send the injection solution to the inner tube flow path, whereby the expandable inner tube packer is expanded by the solution supply pressure of the injection solution to form an outer tube inner space between the plurality of inner tube packers. The injecting solution is discharged from the inner tube discharge port into the outer tube inner space, the outer tube bag body is inflated to form an outer tube packer body, and the injected solution is discharged from the outer tube inner space through the outer tube discharge port to the outside of the outer tube packer. It is characterized by pouring the ground into the ground from the space.

  The above-described present invention automatically forms the inner tube packer and the outer tube packer, or automatically forms the outer tube packer and injects the injection solution from the outer tube inlet, or the inner tube injection solution. By automatically feeding the inner tube packer, the outer tube packer, and the injection solution from the outer tube inlet, the injection process is greatly simplified, or the hole diameter of the injection tube is reduced. This makes it possible to reduce the drilling diameter and greatly reduce the construction cost.

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

FIGS. 21A and 22B are explanatory diagrams of the prior art.
A plurality of outer tube packers 3 forming the outer tube packer body 20 are attached to the tube wall 2 of the injection tube 1 at intervals, and open to the outer tube packer 3 adjacent to the inside and the upper and lower sides of the outer tube packer 3. The injection tube device X is configured to include the discharge ports 5, 5... 5 in the outer tube packer.
The injection tube device X configured as described above is inserted into a drilling hole 7 provided in the ground 6. Next, a curable suspension is filled into the outer tube packer 3 through the injection inner tube 1 from the discharge port 5 opened inside the outer tube packer 3 and is expanded to form the outer tube packer body 20. Then, the injection material is injected into the space 22 through the injection inner tube 6 from the discharge port 5 opened between the upper and lower adjacent bag bodies 4, 4, and then into the ground 23 from the drilled wall 9 to solidify the ground 23. .

  However, in the above-described conventional technology, the expansion of the bag packer 3 and the discharge of the injection liquid from the discharge port 5 must be performed in separate processes, and the injection process is not simplified and the hole diameter cannot be reduced. .

  In FIG. 1 (a) of the present invention, the outer tube 2 of the injection tube device A of the present invention is inserted into the hole 1. The outer tube is fitted with an impermeable and expandable outer tube packer 3 made of at least one elastic material. A discharge port 5 in the outer tube packer is provided on the outer tube wall 9 inside the outer tube packer 3 so as to be covered with the check valve 4. An outer tube inlet 16 covered with an outer tube inlet check valve 17 is provided on at least the outer tube wall 24 below the outer tube packer 3.

FIG. 1 (b) is a view in which the inner tube 6 is inserted into the outer tube 2. The inner tube is provided with a plurality of inner tube packers 8 across the inner tube packer discharge port 12, and the inner tube packer tube wall 10 of the inner tube packer 8 is provided with an inner tube packer discharge port 11. Yes. Both the outer tube packer 3 and the inner tube packer 8 are made of a water-impermeable elastic expandable material and are caulked up and down. Both the outer tube packer 3 and the inner tube packer 8 expand due to pressurization by the fluid from the inner tube 6, and the inner tube packer contracts by stopping the pressurization of the inner tube pack body fluid or sucking out the fluid in the packer. Flattened. The discharge port area S ₂ of the inner pipe packer between the outlets 12 discharge resistance force equal to less than the discharge port area S ₁ of the inner tube packer in the discharge port 11 are designed large. One or a plurality of discharge ports may be provided, and the area may be considered to be the sum of the areas of the discharge ports. Of course, a fluid may be ejected to the discharge port as a fine hole. In addition, it is possible to increase the discharge resistance by providing a resistor on the discharge port. In any case, it is preferable that the discharge resistance between the packers is larger than that in the packer.

  FIG. 2C is a drawing in which a fluid is fed to the outer tube and the inner tube. When the fluid 7 is fed to the inner tube 6, the discharge port 12 has a smaller discharge port area and larger discharge resistance than the discharge port 11, so that the fluid first expands the inner tube packer 8 from the discharge port 11 to cause the inner tube packer 25 to move. Then, the space 13 between the inner tube packers is formed. The fluid 7 filled in the space 13 pushes and expands the elastic check valve 4 such as a rubber sleeve from the discharge port 5 to expand the outer tube packer 3 to form the outer tube packer body 20. The outer tube packer body is pressure-bonded to the bore wall to form the outer tube outer space 22. The outer tube packer body remains expanded without returning to the outer tube by the check valve 4. Since the outer tube packer body is made of a rubber film or the like, a protective coating 26 with a strong net or the like may be provided on the outside in order to break if excessive pressure is applied. (FIG. 20 (c)) In the present invention, the inner tube packer and the outer tube packer can be formed automatically or continuously by feeding a fluid into the inner tube, and the operation is simple. Can increase efficiency. The fluid may be an injection solution having a gelling function, or water, air, inert gas, or the like. Further, the packer may be formed of a packer fluid such as water or a chemical solution, and the injection for ground improvement may be replaced with an injection solution according to the purpose such as colloidal silica. After forming the packer bodies 20 and 25, if pressure reduction such as stopping or sucking out the fluid 7 is performed, the inner tube packer contracts due to its elasticity and can be freely inserted into the outer tube. Therefore, even if the injection tube is long and the outer tube is deformed or curved due to earth pressure, the inner tube can be easily inserted.

  After forming the packer body as described above, as shown in FIG. 2 (d), the inner tube is moved further downward so that the upper and lower inner tube packers 8 are positioned so as to sandwich the outer tube discharge port 16, and the inner tube. When the injection solution is fed from the outside, the injection solution is injected into the ground 23 through the outer tube outer space 22 in the presence of the outer tube packer. 5 and 6 show that the inner tube packer body and the outer tube body are formed when a discharge port 12 'similar to the inner tube discharge port 12 is provided at the lower end of the inner tube 6 or below the inner tube packer 8 and the injection liquid is fed from the inner tube. The formation of the tube packer body and the injection into the ground from the outer tube discharge port 16 'below the tube packer body are automatically performed. Reference numeral 17 'denotes a check valve whose cylindrical end is contracted by rubber elasticity.

  FIG. 3A shows the expansion of the inner tube packer 8 through the discharge port 11 by the packer fluid 15 fed from the inner tube packer flow path 14, and the fluid 7 is fed from the inner tube 6 to move the outer tube packer 3. The structure to be expanded is shown.

  FIG. 4B shows that the injection liquid 7 discharged from the discharge port 12 after the inner tube packer 8 and the outer tube packer 3 are formed with the injection liquid or the packing fluid such as water or gas is discharged into the outer tube inner space 27. It is injected from the outer tube inlet 16 into the ground 23 through the outer tube outer space 22.

  FIG. 10D shows an example in which the position of the inner tube packer 8 is provided so as to sandwich the discharge port 5 in the outer tube packer and the discharge port 16 'of the outer tube. If the discharge resistance of the discharge port 16 ′ (discharge resistance of the discharge port 8) is the discharge resistance of the discharge port, the packer 8 is formed, the packer 3 is formed, and the flow from the discharge port 16 ′ to the ground is continuously performed. . 7 to 8 are views in which the inner tube is lowered and injected from the outer tube discharge port 16 'after forming the outer tube packer. Each of FIGS. 1 to 5 is an example in which one outer tube packer is used to improve the ground below it, and the present invention can be injected from a large columnar penetration (outer tube outer space), so that the injection range can be widened. For this reason, it is used to form a consolidated body having a large depth and permeation diameter with a single-stage outer tube packer. According to the present invention, since a consolidated diameter of 1.5 to 3 m can be maintained, an injection hole pitch of 2 to 4 m is possible, so a 4 m consolidated layer can be constructed in one stage, thus preventing liquefaction. Very suitable for injection. That is, when the liquefied layer is 4 m, one stage can be made by a simple operation, and its usefulness cannot be measured including economic efficiency.

If the inner tube packer flow path is not used, the inner tube diameter may be small. Accordingly, the outer tube diameter is reduced and the drilling hole diameter is reduced. Therefore, the hole cost is reduced, and the formation of the inner and outer tube packers and the injection into the ground can be continuously performed only by injecting the injection solution, and the construction cost can be greatly reduced.
Furthermore, if the porous and multistage simultaneous injection system 29 in FIGS. 7 and 8 is used, a wide range of liquefaction prevention injection methods can be determined and completed in a short period of time.

  10 and 11 show a typical structure example and construction method of the present invention using an outer tube 2 having a plurality of outer tube packers 3 (a) Inserting the outer tube 2 into a drilling hole, (b) Outside The inner tube packer 8 and the outer tube packer 3 are formed by inserting the inner tube 6 into the tube and (c) feeding the fluid into the inner tube (which may be an injection solution or a packer fluid). (D). The inner tube packer 8 is contracted by stopping the fluid feeding or sucking out the fluid (the outer tube packer 3 does not contract due to the presence of the check valve 4). (D) The upper tube is moved upward to form the upper outer tube packer 3. (e) The inner tube packer 8 is positioned across the outer tube inlet 16 ″ leading to the outer tube outer space. The injection solution 7 is fed from 6 and injected into the ground through the outer space 22 outside the outer tube. In (f), the lowermost portion of the injection stage at the lowermost part of the outer tube may not have an outer tube packer. The injected liquid easily moves upward, and the upper part is constrained by the lowermost packer of the outer tube.

FIGS. 12A and 14 show an example in which a plurality of injection stages are simultaneously injected from the inner tube 6 into the outer tube outer space 22 between two or more outer tube packers 3. If the discharge port area is S ₃ <S ₂ <S ₁ (if a plurality of discharge ports are provided, the discharge areas S ₁ , S ₂ , and S ₃ may be the sum of them), the injection solution 7 is used as the inner tube. When the liquid is fed, the formation of the inner tube packer → formation of the outer tube packer → multistage simultaneous injection from the plurality of outer tube inlets into the ground is automatically performed. In this case, if the inner tube is loosely inserted into the next stage and injected, simultaneous injection is performed in a number of multiple stages. In addition, S is a magnitude | size of discharge resistance force, Comprising: It does not necessarily need to be an area, A discharge port may be covered with a seal | sticker, and resistance objects, such as a cone, may be inserted. FIGS. 13B and 13C are partial enlarged views of FIG.

In addition, this structure is characterized by providing a large number of outer tube packers on all long injection stages and inserting the inner tube into the outer tube and injecting it while it is set in place without moving the injection stage at once. It is possible to perform full depth injections. At this time, if the ground permeability coefficient is k ₁ , k ₂ (k ₂ <k ₁ ) for each injection stage, the injection amount per injection stage in the injection range per each ground can be calculated. The injection amount such as a gap corresponding to the water permeability coefficient in each stage so that the injection of each injection stage per one can be completed within the same time is the discharge area S _3-1 , S _3-2 ( If the inner tube discharge port is prepared in advance so that S _3-2 <S _3-1 ), the water permeability coefficient is different in the injection hole, and therefore the injection rate and the injection amount in each injection stage are different. Thus, it is possible to achieve groundbreaking ground improvement that a solidified body having the same design penetration diameter can be obtained from the top to the bottom with the same injection time.

For example, the k ₁ ground has a larger hydraulic conductivity than the k ₂ ground. Therefore, since the gap is large, the injection amount is larger than the k ₂ ground if the same consolidation diameter is attempted. Same solid in order to be in so as to inject each of the ground is completed Yui径to allow the injection rate of k ₁ Ground greater than the injection rate of the k ₂ Ground the same time. Its inlet area and the outlet area for the _{S2 <S1, S3 <S2,} S 3-1 < may be designed to be _{S 3-1.} Then, it is sufficient to use an injection inner tube designed such that S _1-1 <S _3-1 so that the ratio of the injection rate determined in advance is obtained.

FIG. 14 is based on the same principle as FIGS. In this case, if S ₃ <S ₂ and k ₂ <k ₁ in the figure, the inner pipe discharge port may be designed so that S _3-2 <S _3-1 .

  15 to 18 show that the formation of the plurality of outer tube packers 3 and the injection from the outer tube injection port 16 'are automatically performed, or the injection tube is moved to perform the injection from the plurality of outer tube injection ports. An example is shown.

  In FIG. 15, the pair of inner tube packers 8 is inserted so as to sandwich an upper tube discharge port 5 between upper and lower outer tube packers and an outer tube injection port 16 sandwiched between upper and lower outer tube packers 3. Water or other fluid is injected from the inner tube 6 to expand the inner tube packer 8 and the outer tube packer 3 and then injected into the injection ground from the outer tube inlet 16 to measure the formation of the outer tube packer and the water permeability of the ground. Then, the injection solution can be again injected from the inner tube to automatically form the inner tube packer and inject the outer tube inlet 16 into the ground.

  In this case, if the injection solution is sent to the inner tube from the beginning, the formation of the inner tube packer, the formation of the outer tube packer, and the injection of the injection solution into the ground from the discharge port of the outer tube can be automatically performed.

In this case, the area of the discharge port in the figure is preferably the sum of S ₁ > S ₂ and S ₅ <S ₄ .
That is, after the inner tube packer body 25 is formed, the injection liquid 7 flows into the upper and lower outer tube packers 3 from the upper and lower outer tube packer discharge ports 5 through the discharge ports 12 between the inner tube packers. After being formed, it is injected into the ground through the outer tube outer space 22 from the discharge port between the outer tube packers. Further, in FIG. 17 connected to FIG. 15, the order in which the injection inner tube is moved downward to form the outer tube packer body 20 and injection into the ground from the outer tube inlet 16 ″ may be arbitrary.

  In this case, in FIG. 15, the infusate is infused with the instantaneous infusion liquid or suspension type infusion liquid from the outer tube injection port 16 ″, so that the coarse layer is preliminarily injected with the instantaneous infusion liquid or suspension. By performing rough injection, it is possible to inject a long-type injection solution or a solution-type injection solution having excellent permeability in the injection shown in FIG.

  16 and 18, the packer fluid pipe line 15 is provided in the injection inner pipe 6, and the inner pipe packer body is formed of packer fluid, but the principle is the same as in FIG. In the present invention, the injection inner pipe may be combined with a double pipe, a parallel pipe or a packer flow path. In this case, the liquid A and the liquid B are separately fed, so that an instantaneous liquid grout or an injection liquid having an arbitrary gel time can be injected according to the ground condition or the injection purpose.

  15 and 16, since the injection liquid is fed from the inner pipe to the double pipe 30, the A liquid and the B liquid can be joined and injected from the outer pipe discharge port, so that the gel time of the injection liquid can be adjusted freely. In addition, primary injection with an instantaneous setting injection solution can be performed, and when a long setting grout is injected and escapes to the ground surface or the like, the gel time can be freely shortened to prevent the escape. As shown in FIG. 13, the double pipe may be a parallel pipe or may be combined with a packer fluid line. Simultaneous injection of multiple injection stages and instantaneous injection and long-injection injection can be performed simultaneously.

  FIG. 20 (a) shows a structure in which the discharge port of the outer tube pipe wall between the outer tube packers is covered with a water-permeable wall protective material 31, and FIG. 20 (b) shows an elastic coating film 32 having a through hole. Covering the outer tube discharge port, so that the injection solution from the outer tube is uniformly distributed from the gap formed in the coating film and the outer tube wall over the entire drilling wall, and is injected evenly while protecting the hole wall Shows the structure. FIG. 20C shows an example in which a net 26 is stretched on the packer.

  FIG. 20 (b) shows that the rubber-like outer tube packer expands due to the injection pressure and expands so as not to be damaged, but the outer tube packer is covered with a water-permeable protective covering 33 such as a plastic net having pressure resistance. The structure which covered the discharge outlet is shown.

In the present invention, the injection tube may be inserted into the ground in the horizontal direction.
These are explanatory drawings of the ground injection construction method concerning the present invention using injection liquid sending device X. FIG. In FIG. 23, similarly to the above, the ground 1 of the ground 1 is curved obliquely downward from the ground surface 2 and then the bored hole 3 is drilled in the horizontal direction. An outer pipe 7 having a plurality of outer pipe discharge ports 5, 5... 5 provided with a check valve 4 as shown in FIG. 1 is installed in the boring hole 3. Three or more expansion / contraction packers 8, 8... 8 are provided at intervals in the direction so that the expansion / contraction packers 8, 8 adjacent to each other serve as discharge positions 9, and the inner wall discharge port 10 has separate discharge positions 9. A plurality of infusion fluid channels 11 located at the same position, a packer channel 12 for supplying fluid to the expansion / contraction packer 8 for expansion or discharge and contraction, and an inner tube 13 formed independently inside each other are freely movable. And the discharge position 9 is matched with the outer tube discharge port 5, and then the fluid is sent to three or more expansion / contraction packers 8, 8... Thus, the inner space 15 is formed in the gap 14 between the expansion / contraction packers 8 and 8 adjacent to each other. Form, from the injection fluid feeding device X through the pipe space 15 and the outer tube discharge port 5 is injected into the ground 1 of the infusate through the inner tube the discharge port 10. In FIG. 8, detailed description of the outer tube 7 and the inner tube 13 is omitted, and a state in which the inner tube 13 is movably inserted into the outer tube 7 is represented as an injection tube A.

  The infusion solution feeding apparatus X shown in FIG. 23 includes a control unit 30, an infusion solution pressurizing unit 31, an infusion solution distribution unit 32, an infusion unit 33, and a solution delivery system 34. When the operation is performed manually, the control unit 30 is not necessary. Hereinafter, an example using the control unit 30 will be specifically described in detail.

  As shown in FIG. 23, the infusate pressurizing unit 31 pressurizes by an infusate pump 36 (grouting pump) from the infusate tank 35, and as a pressurized infusate via the liquid feeding system 34, the infusate distributor 32 To liquid. The grout pump 36 receives an instruction from the injection monitoring board 30a of the control unit 30 and pressurizes the injected liquid to a desired pressure.

  The infusate distribution unit 32 includes a plurality of branch pipes 37, 37. Each of these branch pipes 37, 37... 37 has a connecting portion 38 connected to the injection pipe A at the tip. The connecting portion 38 may switch the branch pipe 37 to another injection pipe A when a predetermined injection amount is injected through a predetermined injection pipe A or when a predetermined injection pressure is reached. it can.

  As shown in FIG. 23, the branch pipes 37, 37... 37 described above are respectively extended from the distribution container 39 connected to the pressurizing unit 31 via the liquid feeding system 34, and are arranged at the tip. The connecting portion 38 is connected to the injection tube A. Then, the pressurized injection liquid from the pressurizing unit 31 is distributed to the branch pipes 37, 37... 37 through the distribution container 39 and sent to the injection pipe A. The distribution container 39 may be provided with a stirring device (not shown). Moreover, each branch pipe 37, 37 ... 37 can also be connected with the liquid feeding meter 34 from the pressurization part 31 immediately after not passing through the distribution container 39. FIG.

Further, in FIG. 23, the flow rate of the liquid flow meter 40 can be grasped by measuring the total amount of the branch flow meters f ₁ , f ₂ ... F ₁ , f _n. The total 40 is not necessarily required. Further, the liquid feeding pressure gauge 41 is not necessarily provided in the liquid feeding system 34 but may be provided in the distribution container 39 immediately after. V _{1 to} V ₄ are branch valves, P _{1 to} P ₄ are branch pressure gauges, 30 b is an operation panel 30 c is an injection recording board, 30 d is a data input device, and 42 is a liquid feed valve. Reference numeral 43 denotes a pressure cylinder for sending fluid to the expansion / contraction packer 8, and 44 denotes an inner pipe automatic elevator, both of which are connected to the control unit 30 and operate in response to an instruction from the control unit 30.

  FIG. 24 is an explanatory diagram of a ground injection method according to the present invention using a multi-injection injection device as an injection solution delivery device. An injection solution tank 35 for storing the injection solution and an independent motor such as a motor in each plant. Although not shown in the drawing, the unit pumps 46, 46... 46 operated by a common drive source 45 and connected to the control unit 30 are controlled, and these unit pumps 46, 46. The liquid feed pipes 47, 47,... A connecting portion 38 is provided at the tip of each liquid feeding pipe 47, 47... 47, and is connected to the injection liquid flow path 11 of the inner pipe 13 (not shown) of the injection pipe A inserted into the boring hole 3 of the ground 1. The injection liquid in the injection liquid tank 35 is pumped to the injection liquid flow path 11 of each injection pipe A at an arbitrary injection speed, injection pressure or injection volume by the operation of each unit pump 46, 46. The rubber sleeve 4 is pushed open from the tube discharge ports 5, 5. V is a branch valve. The pressure cylinder 43 and the automatic elevator 44 operate in response to an instruction from the control unit 30 as in FIG.

  9 to 16, when injecting a consolidated material into the ground using an injection pipe device comprising an outer pipe and an inner pipe inserted into the outer pipe, conventionally, the injection pressure in the injection pipe is positioned on the ground surface. It was measured with a pressure gauge.

  However, this injection pressure is actually the resistance pressure of the injection pipe and the resistance pressure of the inner pipe outlet added to the original ground injection pressure penetrating between the soil particles, It does not indicate. In particular, when the inner pipe discharge port is an injection port composed of fine holes, the inner pipe pressure increases due to the resistance force of the injection port, and the pressure in the actual ground cannot be grasped. There is a problem that the determination of whether or not the determination is made cannot be confirmed by the change in the injection pressure.

  In other words, this pressure is largely influenced by the liquid supply pressure in the ground and the resistance pressure of the inner pipe flow path and the discharge port. It is unclear whether the ground has been destroyed too much and the infusion has deviated.

  Therefore, the present invention directly and accurately grasps the injection pressure from the discharge port into the ground when injecting the consolidated material from the inner tube discharge port located between the inner tube packers into the ground through the outer tube discharge port. An object of the present invention is to provide an injection pipe device and a ground injection method that have improved the above-mentioned drawbacks of the known technology.

  According to the injection tube device of the present invention, the ground injection device comprises an outer tube and an inner tube inserted into the outer tube, and injects a consolidated material into the ground to consolidate the ground. The outer tube has an outer tube discharge port on the outer tube surface, the inner tube is provided with a plurality of inner tube packers at intervals, and an inner tube discharge port is provided between adjacent inner tube packers, When inserting the inner tube into the outer tube, the injection tube is inserted so that an outer tube discharge port is located between adjacent inner tube packers and a space is formed between the inner tube packers in the outer tube. In the device, a pressure transmission member that senses and transmits the pressure in the space is installed in the injection device, and the pressure sensed in the space is transmitted and measured through the pressure transmission member, and an accurate ground injection pressure is measured. It is characterized by grasping.

  Furthermore, according to the injection tube device of the present invention, the injection tube device includes an outer tube and an inner tube inserted into the outer tube, and injects a consolidated material into the ground to consolidate the ground. The outer tube has one outer tube surface or a plurality of outer tube discharge ports at different positions in the axial direction, and the inner tube is provided with a plurality of inner tube packers spaced apart from each other and adjacent to each other. There is an inner tube discharge port between the tube packers, and when inserting the inner tube into the outer tube, it is inserted so that the outer tube discharge port is located between adjacent inner tube packers. In an injection tube device in which a space is formed between inner tube packers, a strain resistance type pressure sensor disposed in the space, an amplifier connected to the strain resistance type pressure sensor via a signal cable, Pressure display on ground connected to amplifier via signal cable A pressure transmission member comprising a device is installed in the injection device, and the pressure sensor senses the pressure in the space, and the sensed pressure in the space is transmitted to the pressure display device as an electrical signal through the signal cable through the amplifier. It is characterized by grasping the exact injection pressure of the ground.

  Furthermore, according to the injection tube device of the present invention, the injection tube device includes an outer tube and an inner tube inserted into the outer tube, and injects a consolidated material into the ground to consolidate the ground. The outer tube has one outer tube surface or a plurality of outer tube discharge ports at different positions in the axial direction, and the inner tube is provided with a plurality of inner tube packers spaced apart from each other and adjacent to each other. There is an inner tube discharge port between the tube packers, and when inserting the inner tube into the outer tube, it is inserted so that the outer tube discharge port is located between adjacent inner tube packers. In an injection tube device in which a space is formed between inner tube packers, a strain resistance type pressure sensor connected to the space via a tube, an amplifier connected to the pressure sensor, and a signal cable to the amplifier Pressure consisting of pressure display devices on the ground connected via The end of the tube located in the space senses the pressure in the space, and the sensed pressure is transmitted to the pressure display device via a pressure sensor and an amplifier for measurement. It is characterized by grasping an accurate injection pressure of the inner pipe discharge port.

  Furthermore, according to the ground injection method of the present invention, in the ground injection method for injecting a caking material into the ground and consolidating the ground, the surface has one outer tube discharge port or different in the axial direction. An outer tube having a plurality of outer tube discharge ports at a position, and an inner tube inserted into the outer tube and spaced apart from each other, and having an inner tube discharge port between adjacent inner tube packers When inserting the inner pipe into the outer pipe using a ground injection device comprising a pipe, an outer pipe discharge port is located between adjacent inner pipe packers, and a space is provided between the inner pipe packers in the outer pipe. Further, a pressure transmission member that senses and transmits the pressure in the space is installed in the injection device, and the pressure sensed in the space is transmitted through the pressure transmission member. Measure the transmitted pressure to determine the correct injection pressure at the inner pipe outlet. And characterized in that the grip.

  Further, in the present invention, a plurality of injection tubes can be installed in the ground, and the injection solution can be injected at the same time for multi-point injection.

  FIG. 25 is an explanatory diagram of the multi-point ground injection system X used in the present invention, in which a storage tank 22, a plurality of unit pumps 4, 4... 4 and a plurality of injection pipe devices A, A. A is basically provided.

  The storage tank 22 includes an A liquid tank 22a and a B liquid tank 22b, and has a structure in which the A liquid and the B liquid in these tanks are separately guided to the injection pipe device A and merged. Two injection pipe devices are arranged at the injection point 25 of the ground 1, and liquid A and liquid B are pumped to the two injection pipe devices A and A, respectively, and injected from the outer tube discharge port 5 to the injection point 25. After that, they merge in the ground 1 and react, or different types of injection solutions are injected simultaneously or with a time difference.

  The series of unit pumps 4, 4,... 4 includes a large number of independent unit pumps 4, 4,... 4 in one plant, and these unit pumps 4, 4,. The drive source 2 operates together as a set of injection devices by one centralized control device 3 and is connected to the A liquid tank 22a and the B liquid tank 22b via conduits 21, 21. .

  The injection pipe device A has an outer pipe discharge port 5 at the tip, and a plurality of the injection pipes A are embedded in a plurality of injection points 25, 25... 25 of the ground 1 and communicate with the A liquid tank 22a. .. 4 and unit pumps 4, 4... 4 connected to the B liquid tank 22b.

  FIG. 26 is an explanatory view schematically showing an injection system according to the present invention. From FIG. 26, the injection state of the injection liquid into the ground 1 is understood in a model manner.

  The above-described present invention automatically forms the inner tube packer and the outer tube packer, or automatically forms the outer tube packer and injects the injection solution from the outer tube inlet, or the inner tube injection solution. By automatically feeding the inner tube packer, the outer tube packer, and the injection solution from the outer tube inlet, the injection process is greatly simplified, or the hole diameter of the injection tube is reduced. By doing so, it is possible to reduce the diameter of the hole and greatly reduce the construction cost. Therefore, the present invention has high industrial applicability in the civil engineering field.

(A) It is explanatory drawing of this invention. Inserted state of the outer pipe into the ground. (B) A state in which the inner pipe is inserted into the outer pipe. (C) A state where the packer of the inner and outer pipes is expanded. (D) A state in which the inner pipe is lowered and the injection liquid is injected into the ground from between the inner pipe packers. (A) It is explanatory drawing of this invention. A state where the packer of the inner and outer pipes is expanded. (B) A state in which an injection solution is injected from the inner tube tip discharge port. The figure showing the injection | pouring state of this invention. The figure showing the injection | pouring state of this invention. (A) It is explanatory drawing of this invention. The state before the inner tube packer and outer tube packer are not expanded. (B) The outer tube packer and the inner tube packer are inflated. (C) A state in which the inner pipe is lowered and the injection solution is injected from the inner pipe. (A) It is explanatory drawing of this invention. An outer tube with an outer tube packer installed in the drilling hole. (B) A state in which the inner pipe is inserted into the outer pipe. (C) The state in which the lower outer tube packer is expanded. (D) A state in which all of the outer tube packer and the inner tube packer are expanded. (E) A state in which the injection liquid is being injected into the ground from the discharge ports between the outer tube packers and between the inner tube packers. (F) The state in which the inner tube packer is moved downward and the injection solution is injected into the ground from between the inner tube packers. (A) It is explanatory drawing of this invention. (A) Drawing showing the relationship between the discharge area in the inner tube packer, the discharge area in the outer tube packer, and the discharge area of the inner tube. (B) and (C) are partially enlarged views of (A). Drawing showing the relationship between the inner tube packer discharge area in the outer tube packer, the inner tube discharge area in the outer tube packer, the inner and outer tube discharge areas, and the ground layer. The drawing which showed the relationship between the discharge port area in an inner tube packer, the outer tube packer inner / outer tube discharge port area, and the outer tuber outer area of an inner tube and an outer tube. The drawing which showed the relationship between the discharge port area in an inner tube packer, the discharge port area in an outer tube packer, and the discharge port area outside a packer of an inner tube and an outer tube. The drawing showing the injection liquid discharge state of this invention. The figure showing the other example of the injection liquid discharge state of this invention. Drawing showing the state of injection into the ground of instantaneous setting and long setting injection solution. (A) It is drawing showing the other example of this invention. (A) An example in which the outer tube discharge port is covered with a wall surface protective material. (B) An example in which the discharge port is covered with an elastic through-hole protective coating film. (C) An example of a net on a packer. (A) It is explanatory drawing of a prior art. The figure showing the state which is injecting injection liquid from between outer tube packers. (B) A drawing showing a state in which the outer tube packer is expanded by the double tube double packer. An example in which the injection tube is inserted horizontally into the ground. An example in which an injection tube is inserted horizontally into the ground using a multi-component injection device. The figure which showed one specific example of the multipoint ground injection system. Drawing which represented the multipoint ground injection system of the present invention typically.

Explanation of symbols

1 Drilling hole 2 Outer tube 3 Outer tube packer 4 Check valve 5 Outer tube packer discharge port 6 Injection inner tube 7 Injection liquid (fluid)
8 Inner tube packer 9 Outer tube wall 10 Inner tube tube wall 11 Inner tube packer discharge port 12 Inner tube discharge port A Injection tube device

FIGS. 21A and 22B are explanatory diagrams of the prior art.
A plurality of outer tube packers 3 forming the outer tube packer body 20 are attached to the tube wall 2 of the injection tube 1 at intervals, and open to the outer tube packer 3 adjacent to the inside and the upper and lower sides of the outer tube packer 3. The injection tube device X is configured to include the discharge ports 5, 5... 5 in the outer tube packer.
The injection tube device X configured as described above is inserted into the drilling hole 7 provided in the ground 23 . Next, a curable suspension is filled into the outer tube packer 3 through the injection inner tube 1 from the discharge port 5 opened inside the outer tube packer 3 and is expanded to form the outer tube packer body 20. Then, the injection material through an injection in the tube from the discharge port 5 which opens between the bag 4 and 4 vertically adjacent to the space 22, then poured into ground 8 from drilling the wall 9, consolidate the soil 23 To do.

In FIG. 1 (a) of the present invention, the outer tube 2 of the injection tube device A of the present invention is inserted into the hole 1. The outer tube is fitted with an impermeable and expandable outer tube packer 3 made of at least one elastic material. A discharge port 5 in the outer tube packer is provided on the outer tube wall 9 inside the outer tube packer 3 so as to be covered with the check valve 4. An outer tube inlet 16 covered with an outer tube inlet check valve 17 is provided on at least the outer tube wall below the outer tube packer 3.

FIG. 2C is a drawing in which a fluid is fed to the outer tube and the inner tube. When the fluid 7 is fed to the inner tube 6, the discharge port 12 has a smaller discharge port area and larger discharge resistance than the discharge port 11, so the fluid first expands the inner tube packer 8 from the discharge port 11 to form an inner tube packer body. Then, a space 13 between the inner tube packers is formed. The fluid 7 filled in the space 13 pushes and expands the elastic check valve 4 such as a rubber sleeve from the discharge port 5 to expand the outer tube packer 3 to form the outer tube packer body 20. The outer tube packer body is crimped to the drilling wall to form an outer tube outer space . The outer tube packer body remains expanded without returning to the outer tube by the check valve 4. Since the outer tube packer body is made of a rubber film or the like, a protective coating 26 with a strong net or the like may be provided on the outside in order to break if excessive pressure is applied. (FIG. 20 (c)) In the present invention, the inner tube packer and the outer tube packer can be formed automatically or continuously by feeding a fluid into the inner tube, and the operation is simple. Can increase efficiency. The fluid may be an injection solution having a gelling function, or water, air, inert gas, or the like. Further, the packer may be formed of a packer fluid such as water or a chemical solution, and the injection for ground improvement may be replaced with an injection solution according to the purpose such as colloidal silica. After the packer body 20 is formed, the inner tube packer contracts due to its elasticity and can be freely inserted into the outer tube by reducing the pressure such as stopping or sucking the liquid 7. Therefore, even if the injection tube is long and the outer tube is deformed or curved due to earth pressure, the inner tube can be easily inserted.

After forming the packer body as described above, as shown in FIG. 2 (d), the inner tube is moved further downward so that the upper and lower inner tube packers 8 are positioned so as to sandwich the outer tube discharge port 16, and the inner tube. If the injection solution is fed from the outside, the injection solution is injected into the ground through the outer space outside the outer tube in the presence of the outer tube packer. 5 and 6 show an inner tube packer body and an outer tube packer when a discharge port similar to the inner tube discharge port 12 is provided at the lower end portion of the inner tube 6 or below the inner tube packer 8 and an injection solution is fed from the inner tube. Formation of the body and injection into the ground from the outer tube discharge port below it is automatically performed. Reference numeral 17 denotes a check valve whose cylindrical end is contracted by rubber elasticity.

FIGS. 9A to 11F are examples in which the position of the inner tube packer 8 is provided so as to sandwich the discharge port 5 in the outer tube packer and the discharge port 16 of the outer tube. If the discharge resistance of the discharge port 16 (discharge resistance of the discharge port 8) is the discharge resistance of the discharge port as shown in FIG. 10 (d), the formation of the packer 8 is changed to the formation of the packer 3 and the ground from the discharge port 16 . The flow is continuous. 7 to 8 are views in which the inner tube is lowered and injected from the outer tube discharge port 16 after forming the outer tube packer. FIGS. 1 to 8 are examples in which one outer tube packer is used to improve the ground below the present invention, and the present invention can be injected from a large columnar penetration (outer tube outer space), so that the injection range can be widened. For this reason, it is used to form a consolidated body having a large depth and permeation diameter with a single-stage outer tube packer. According to the present invention, since a consolidated diameter of 1.5 to 3 m can be maintained, an injection hole pitch of 2 to 4 m is possible, so a 4 m consolidated layer can be constructed in one stage, thus preventing liquefaction. Very suitable for injection. That is, when the liquefied layer is 4 m, one stage can be made by a simple operation, and its usefulness cannot be measured including economic efficiency.

If the inner tube packer flow path is not used, the inner tube diameter may be small. Accordingly, the outer tube diameter is reduced and the drilling hole diameter is reduced. Therefore, the hole cost is reduced, and the formation of the inner and outer tube packers and the injection into the ground can be continuously performed only by injecting the injection solution, and the construction cost can be greatly reduced.
Furthermore , if the porous and multistage simultaneous injection system shown in FIGS. 7 and 8 is used, a wide range of liquefaction prevention injection methods can be determined and completed in a short period of time.

10 and 11 shows the typical structure example and construction methods of the present invention using an outer tube 2 having a plurality of outer tube packer 3. (A) Insertion of the outer tube 2 into the drilling hole, (b) Insertion of the inner tube 6 into the outer tube, (c) Inner by feeding fluid (either injection liquid or packer fluid) into the inner tube. The tube packer 8 and the outer tube packer 3 are formed. (D) Shrinkage of the inner tube packer 8 by stopping fluid feeding or sucking out the fluid (the outer tube packer 3 does not shrink due to the presence of the check valve 4). (D) moves the inner tube upward to form the upper outer tube packer 3, (e) locates the inner tube packer 8 across the outer tube inlet 16 leading to the outer tube outer space, and from the inner tube 6 The injection solution is fed and injected into the ground through the outer space 22 outside the tube. In (f), the lowermost portion of the injection stage at the lowermost part of the outer tube may not have an outer tube packer. The injected liquid easily moves upward, and the upper part is constrained by the lowermost packer of the outer tube.

In this case, the area of the discharge port in the figure is preferably the sum of S ₁ > S ₂ and S ₅ <S ₄ .
That is, after the inner tube packer body is formed, the injection liquid 7 flows into the upper and lower outer tube packers 3 from the upper and lower outer tube packer discharge ports 5 through the discharge ports 12 between the inner tube packers to form the outer tube packer body. After that, it is injected into the ground through the outer tube outer space 22 from the discharge port between the outer tube packers. Further, in FIG. 17 connected to FIG. 15, the order in which the injection inner tube is moved downward to form the outer tube packer body and to inject the ground from the outer tube injection port 16 ″ may be arbitrary.

In FIGS. 15 and 16, the injection liquid can be fed from the inner tube into a double tube so that the liquid A and the liquid B can be combined and injected from the outlet of the outer tube, so that the gel time of the injection can be adjusted freely. The primary injection with the instantaneous setting liquid can be performed, and when the long setting grout is injected and escapes to the ground surface or the like, the gel time can be freely shortened to prevent the escape. As shown in FIG. 19, the double pipe may be a parallel pipe or may be combined with a packer fluid line. Simultaneous injection of multiple injection stages and instantaneous injection and long-injection injection can be performed simultaneously.

In the present invention, the injection tube may be inserted into the ground in the horizontal direction. FIG. 23 is an explanatory view of the ground injection method according to the present invention using the injection liquid feeding device X. In FIG. 23, similarly to the above, the ground 1 of the ground 1 is curved obliquely downward from the ground surface 2 and then the bored hole 3 is drilled in the horizontal direction. An outer pipe 7 having a plurality of outer pipe discharge ports 5, 5... 5 provided with a check valve 4 as shown in FIG. 1 is installed in the boring hole 3. Three or more expansion / contraction packers 8, 8... 8 are provided at intervals in the direction so that the expansion / contraction packers 8, 8 adjacent to each other serve as discharge positions 9, and the inner wall discharge port 10 has separate discharge positions 9. A plurality of infusion fluid channels 11 located at the same position, a packer channel 12 for supplying fluid to the expansion / contraction packer 8 for expansion or discharge and contraction, and an inner tube 13 formed independently inside each other are freely movable. And the discharge position 9 is matched with the outer tube discharge port 5, and then the fluid is sent to three or more expansion / contraction packers 8, 8... Thus, the inner space 15 is formed in the gap 14 between the expansion / contraction packers 8 and 8 adjacent to each other. Form, from the injection fluid feeding device X through the pipe space 15 and the outer tube discharge port 5 is injected into the ground 1 of the infusate through the inner tube the discharge port 10. The detailed description of the outer tube 7 and the inner tube 13 described above is omitted, and a state where the inner tube 13 is movably inserted into the outer tube 7 is represented as an injection tube A.

(A) It is explanatory drawing of this invention. Inserted state of the outer pipe into the ground. (B) A state in which the inner pipe is inserted into the outer pipe. (C) is a state where the packer of the inner and outer pipes is expanded. (D) A state in which the inner pipe is lowered and the injection liquid is injected into the ground from between the inner pipe packers. (A) It is explanatory drawing of this invention. A state where the packer of the inner and outer pipes is expanded. (B) A state in which an injection solution is injected from the inner tube tip discharge port. The figure showing the injection | pouring state of this invention. The figure showing the injection | pouring state of this invention. (A) It is explanatory drawing of this invention. The state before the inner tube packer and outer tube packer are not expanded. (B) The outer tube packer and the inner tube packer are inflated. (C) A state in which the inner pipe is lowered and the injection solution is injected from the inner pipe. (A) It is explanatory drawing of this invention. An outer tube with an outer tube packer installed in the drilling hole. (B) A state in which the inner pipe is inserted into the outer pipe. (C) The state in which the lower outer tube packer is expanded. (D) A state in which all of the outer tube packer and the inner tube packer are expanded. (E) A state in which the injection liquid is being injected into the ground from the discharge ports between the outer tube packers and between the inner tube packers. (F) The state in which the inner tube packer is moved downward and the injection solution is injected into the ground from between the inner tube packers. It is explanatory drawing of this invention . (A) Drawing showing the relationship between the discharge area in the inner tube packer, the discharge area in the outer tube packer, and the discharge area of the inner tube. (B) is a partially enlarged view of (c) is 12 (b). Drawing showing the relationship between the inner tube packer discharge area in the outer tube packer, the inner tube discharge area in the outer tube packer, the inner and outer tube discharge areas, and the ground layer. The drawing which showed the relationship between the discharge port area in an inner tube packer, the outer tube packer inner / outer tube discharge port area, and the outer tuber outer area of an inner tube and an outer tube. The drawing which showed the relationship of the discharge port area in an inner tube packer, the outer and outer tube discharge port surface of an outer tube packer, and the discharge port outer area of an inner tube and an outer tube. The drawing showing the injection liquid discharge state of this invention. The figure showing the other example of the injection liquid discharge state of this invention. Drawing showing the state of injection into the ground of instantaneous setting and long setting injection solution. It is drawing which represented the other example of this invention . (A) An example in which the outer tube discharge port is covered with a wall surface protective material. (B) An example in which the discharge port is covered with an elastic through-hole protective coating film. (C) An example of a net on a packer. (A) It is explanatory drawing of a prior art. The figure showing the state which is injecting injection liquid from between outer tube packers. (B) A drawing showing a state in which the outer tube packer is expanded by the double tube double packer. An example in which the injection tube is inserted horizontally into the ground. An example in which an injection tube is inserted horizontally into the ground using a multi-component injection device. The figure which showed one specific example of the multipoint ground injection system. Drawing which represented the multipoint ground injection system of the present invention typically.

DESCRIPTION OF SYMBOLS 1 Drilling hole 2 Injection | pouring outer pipe 3 Outer pipe packer 4 Check valve 5 Outer pipe packer discharge port 6 Injection inner pipe 7 Injection liquid (fluid)
8 Inner tube packer 9 Outer tube wall 10 Inner tube tube wall 11 Inner tube packer discharge port 12 Inner tube discharge port A Injection tube device

The present invention inserts an injection outer tube having at least one packer, particularly a plurality of water-impermeable, expandable and contractible outer tube packers at intervals, into a borehole in the ground, The present invention relates to an injection pipe device for injecting an injection material into the ground from an inner pipe having a packer in a plurality of inner pipes inserted into the outer pipe through a space between the injection pipe, and formation of the inner pipe packer, in particular. The outer tube packer is automatically formed, or the outer tube packer is formed and the injection solution is automatically injected from the outer tube inlet, or the inner tube packer is formed by feeding the inner tube injection solution. It is possible to dramatically simplify the injection process by automatically forming the outer tube packer and injecting the injection solution from the outer tube inlet, or reducing the hole diameter by reducing the hole diameter of the injection tube. Enabling construction costs to be significantly reduced. It relates infusion tube device and ground grouting method.

  When the ground to be injected is alluvium, the hydraulic conductivity is usually larger in the horizontal direction than in the vertical direction. In injecting injection material into such ground and consolidating the ground, conventionally, a plurality of bag bodies forming a bag packer are attached to the injection pipe tube wall at intervals, and the inside and upper and lower sides of the bag body Using an injection tube device having a discharge port that opens between adjacent bag bodies, insert this injection tube device into a drilling hole provided in the ground, and then from the discharge port that opens inside the bag body A technology is adopted in which a bag material is filled in a bag body and inflated to form a bag packer, and the ground is consolidated by injecting an injection material from a discharge port that opens between adjacent bag bodies vertically. It was.

  In addition, a method for injecting an injection solution from an outer tube by simultaneously performing liquid feeding to an inner tube injection tube and formation of an inner tube packer using a double injection tube is already known by the present applicant. In the above-mentioned known technology, the gap formed between the injection tube and the hole-drilling wall is blocked by the bag packer adjacent to the upper and lower sides to form an independent space between the bag packers, and the injection material is passed through this space. It is injected into the ground.

In the case of prior application No. 3509744 filed by the present applicant, for example, the inner tube 6 is first inserted into the outer tube 2 and the outer tube packer 3 made of a water-permeable bag is filled with the consolidated material 7. After the tube packer body 20 is formed, the injection solution 7 is injected into the ground 23 through the outer tube injection port 16 into the outer tube outer space 22 formed by the upper and lower outer tube packer bodies. The inner tube packer 8 is press-fitted into an inner tube packer of an inflatable / decompressible rubber bag through an elastic body such as synthetic rubber or a packer fluid line provided in the inner tube to form the inner tube packer 8. .

However, in the above injection, the process of forming the packer body of the outer tube and the injection of the injection solution from the inner tube into the ground are performed separately. Further, forming the inner tube packer by providing the flow path of the packer fluid in the inner tube increases the inner tube diameter, and therefore increases the outer tube diameter and the drilling hole diameter. Moreover, both of these require a long construction period and high construction costs.

Further, by raising the prior application Patent No. 4034305 by the present applicant as an example, after performing formation of the outer tube packer advance, and performing injection and formation of the packer in the inner tube at the same time. This increases the number of processes. Therefore, further simplicity and shortening of the construction period have been desired.
Japanese Patent No. 3509744 Patent No. 4034305

  Therefore, the problem to be solved by the present invention is to automatically form the inner tube packer and the outer tube packer, or automatically form the outer tube packer and inject the injection liquid from the outer tube inlet. Alternatively, the injection process is dramatically simplified by automatically forming the inner tube packer and the outer tube packer and injecting the injection solution from the outer tube injection port by feeding the inner tube injection solution, or By reducing the hole diameter of the injection pipe, it is possible to reduce the drilling diameter and significantly reduce the construction cost. The injection pipe apparatus, the outer pipe packer forming method, and the ground injection construction method have improved the disadvantages of the above-mentioned known techniques. I will provide a.

In order to solve the above-described problems, according to the injection tube device of the present invention, the injection solution is injected into the ground from the injection outer tube having the outer tube packer installed in the drilling hole in the ground through the injection inner tube into the ground. In the injection pipe device for injecting from the inlet, the outer pipe packer is a water-impermeable expansion / contraction packer, and the outer pipe packer is covered with a check valve provided on the pipe wall of the injection outer pipe in the outer pipe packer. The inner tube is expanded by the fluid filled in the outer tube packer through the injection inner tube, the inner tube has a plurality of inner tube packers, and the inner wall packer has a wall inside the inner tube packer. The inner tube wall between the plurality of inner tube packers has an inner tube discharge port, and the plurality of inner tube packers are loosely inserted into the outer tube so as to sandwich the outer tube discharge port. inserted, infusion by feeding a fluid to imperial bridal party's entry into the court tract, space fluid is water-impermeable inflation and deflation of outer tube package from between the inner tube packer Characterized by injecting into the ground the injectate from the outer tube inlet to form an outer tube packer body and stuffing within.

Furthermore, in order to solve the above-mentioned problem, according to the ground injection method of the present invention, the injection solution is injected from the outer tube injection port into the ground through the injection inner tube into the injection outer tube installed in the ground drilling hole. In the ground injection construction method, the injection outer tube is attached with one or more impermeable outer tube packers forming an outer tube packer body on the outer tube wall, and a plurality of the outer tube packs at intervals. An outer tube inlet is provided between the outer tube packers adjacent to the lower side or upper and lower sides of the packer, and an outer tube packer discharge port covered with a check valve opened in the outer tube packer is provided. The injection inner tube to be inserted into the tube is provided with a plurality of inflatable inner tube bag bodies sandwiching the discharge ports between the inner tube packers to form a plurality of inner tube packers, and by sending fluid to the inner tube, The inner tube bag body is expanded by the fluid pressure of the fluid discharged from the bag body discharge port to form the inner tube packer. Is characterized by a fluid is filled to the outer tube packer body is formed in the outer tube packer from the outer tube packer discharge opening through the inner tube packer between the space in which it is formed by.

  Furthermore, in order to solve the above-described problems, according to the ground injection method of the present invention, the inner surface of the inflatable structure is expanded from the outer surface of the injection outer tube having a water-impermeable and expandable outer tube packer installed in the drilling hole in the ground. In a ground injection method for injecting an injection solution into a ground through an injection inner pipe having a plurality of pipe packers, the outer pipe wall has one or a plurality of outer pipe injection ports, and a plurality of injection inner pipes adjacent to each other in the outer pipe A plurality of inner tube packers are positioned so as to sandwich the discharge ports in the outer tube packer, and the outer tube packer is provided with discharge ports in the outer tube packer having check valves, and the plurality of outer tubes The outer tube wall between the packers is provided with an inlet between outer tube packers having a check valve. The fluid is fed into the inner tube to expand the inner tube packer, and then the inner tube packer is discharged. From the outlet through the outlet in the outer tube packer, it flows into the upper and lower outer tube packers to form the outer tube packer body. Further characterized in that injecting an injection fluid from the outer tube inlet opening between the outer tube packer body.

Furthermore, in order to solve the above-mentioned problem, according to the ground injection method of the present invention, the injecting inner tube is positioned such that a plurality of inflatable inner tube packers sandwich the outer tube packer inner / outer tube discharge port, Further, the inner tube packer has an inner tube discharge port in the inner tube packer, and an inner tube having an inner tube discharge port communicating with the outer tube discharge port between the inner tube packers provided at the intervals. The tube is used to send the injection solution to the inner tube flow path, whereby the expandable inner tube packer is expanded by the solution supply pressure of the injection solution to form an outer tube inner space between the plurality of inner tube packers. The injecting solution is discharged from the inner tube discharge port into the outer tube inner space, the outer tube bag body is inflated to form an outer tube packer body, and the injected solution is discharged from the outer tube inner space through the outer tube discharge port to the outside of the outer tube packer. It is characterized by pouring the ground into the ground from the space.

  The above-described present invention automatically forms the inner tube packer and the outer tube packer, or automatically forms the outer tube packer and injects the injection solution from the outer tube inlet, or the inner tube injection solution. By automatically feeding the inner tube packer, the outer tube packer, and the injection solution from the outer tube inlet, the injection process is greatly simplified, or the hole diameter of the injection tube is reduced. This makes it possible to reduce the drilling diameter and greatly reduce the construction cost.

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

FIGS. 17A and 18B are explanatory diagrams of the prior art (Japanese Patent No. 350974) .
A plurality of outer tube packers 3 made of a water-permeable bag forming the outer tube packer body 20 are attached to the tube wall 2 of the injection tube 1 at intervals, and the inside of the outer tube packer 3 and the outer layers adjacent to the upper and lower sides are attached. The injection tube device X is configured by including the discharge ports 5, 5...
The injection tube device X configured as described above is inserted into the drilling hole 7 provided in the ground 23. Next, a curable suspension is filled into the outer tube packer 3 made of a water-permeable bag through the injection inner tube 1 from the discharge port 5 opened inside the outer tube packer 3, and a part of the suspension is permeated. However, the non-permeable suspension is collected and inflated to form the outer tube packer body 20. Then, the injection material is injected into the space 22 through the injection inner pipe from the discharge port 5 opened between the upper and lower adjacent bag bodies 4, 4, and then into the ground 8 from the hole wall 9, and the ground 23 is consolidated.

However, in the above-described prior art, since the outer tube packer is permeable, the expansion of the outer tube packer 3 and the discharge of the injection liquid from the discharge port 5 must be performed in separate processes, which simplifies the injection process. The hole diameter cannot be reduced.

  In FIG. 1 (a) of the present invention, the outer tube 2 of the injection tube device A of the present invention is inserted into the hole 1. The outer tube is fitted with an impermeable and expandable outer tube packer 3 made of at least one elastic material. A discharge port 5 in the outer tube packer is provided on the outer tube wall 9 inside the outer tube packer 3 so as to be covered with the check valve 4. An outer tube inlet 16 covered with an outer tube inlet check valve 17 is provided on at least the outer tube wall below the outer tube packer 3.

FIG. 1 (b) is a view in which the inner tube 6 is inserted into the outer tube 2. The inner tube is provided with a plurality of inner tube packers 8 across the inner tube packer discharge port 12, and the inner tube packer tube wall 10 of the inner tube packer 8 is provided with an inner tube packer discharge port 11. Yes. Both the outer tube packer 3 and the inner tube packer 8 are made of a water-impermeable elastic expandable material and are caulked up and down. Both the outer tube packer 3 and the inner tube packer 8 are expanded by pressurization by the fluid 7 (injection solution) from the inner tube 6 . The inner tube packer deflated by vacuum by suction or the like of the fluid in the pressurization of the stop or packer packer Fluid becomes flat. The discharge port area S ₂ of the inner pipe packer between the outlets 12 discharge resistance force equal to less than the discharge port area S ₁ of the inner tube packer in the discharge port 11 are designed large. One or a plurality of discharge ports 12 may be provided, and the area may be considered to be the sum of the areas of the discharge ports. Of course, the discharge port 12 may eject fluid as fine pores. Further, a resistance such as a check valve can be provided on the discharge port 12 to increase the discharge resistance. In any case, it is preferable that the discharge resistance of the discharge port 12 is greatly than the discharge resistance of the packer within the discharge port 11.

FIG. 2C is a drawing in which a fluid is fed to the outer tube and the inner tube. When the fluid 7 (injection solution) is fed to the inner tube 6, the discharge port 12 between the inner tube packers has a smaller discharge port area and larger discharge resistance than the discharge port 11 in the inner tube packer, so that the fluid first passes through the inner tube from the discharge port 11. The packer 8 is expanded to form an inner tube packer body, and an inner tube packer space 13 is formed. The fluid 7 (injection liquid) filled in the space 13 is expanded in the outer tube packer body 20 by expanding the outer tube packer 3 by expanding the elastic check valve 4 such as a rubber sleeve from the discharge port 5. Form. The outer tube packer body 20 is pressure-bonded to the bore wall to form an outer tube outer space 22 . The outer tube packer body 20 remains expanded without returning to the outer tube by the check valve 4. Since the outer tube packer body is made of a rubber film or the like, a protective coating 26 with a strong net or the like may be provided on the outside in order to break if excessive pressure is applied. In the present invention, the inner tube packer and the outer tube packer can be formed automatically or continuously by feeding a fluid into the inner tube, so that the operation is simple and the efficiency can be improved. . The fluid may be an injection solution having a gelling function, or water, air, inert gas, or the like. Further, the packer may be formed of a packer fluid such as water or a chemical solution, and the injection for ground improvement may be replaced with an injection solution according to the purpose such as colloidal silica. After the packer body 20 is formed, the inner tube packer contracts due to its elasticity and can be freely inserted into the outer tube by reducing the pressure such as stopping or sucking the liquid 7. Therefore, even if the injection tube is long and the outer tube is deformed or curved due to earth pressure, the inner tube can be easily inserted.

After forming the packer body as described above, as shown in FIG. 2 (d), the inner pipe is moved further downward so that the upper and lower inner pipe packers 8 are positioned so as to sandwich the outer pipe inlet 16 and the inner pipe. When the injection solution is fed from the outside, the injection solution is injected into the ground through the outer tube outer space 22 in the presence of the outer tube packer. 5 and 6 show that the inner tube packer body 8 and the outer tube are formed when an injection port similar to the inner tube discharge port 12 is provided at the lower end of the inner tube 6 or below the inner tube packer 8 and the injection liquid is fed from the inner tube. The formation of the packer body 20 and the injection into the ground from the outer tube injection port therebelow are automatically performed. Reference numeral 17 denotes a check valve whose cylindrical end is contracted by rubber elasticity.

3 (a) shows that the inner tube packer 8 is expanded through the discharge port 11 by the packer fluid 15 fed from the inner tube packer flow path 14, and the fluid 7 (injection solution) is fed from the inner tube 6 to the outside. The structure which expands the tube packer 3 is shown.

FIG. 4 (b) shows an injection solution or a fluid for packing such as water or gas, and the injection solution 7 discharged from the inner tube discharge port 12 after the inner tube packer 8 and the outer tube packer 3 are formed is discharged into the outer tube inner space 27. Then, it is injected from the outer tube inlet 16 into the ground 23 through the outer tube outer space 22.

7 (a) to 8 (d), the position of the inner tube packer 8 is provided so as to sandwich the discharge port 5 in the outer tube packer, and a fluid (injection solution) is fed to expand the inner tube packer. Subsequently, the outer tube packer is expanded, and FIG. 9 is then provided so as to sandwich the outer tube discharge port 16 to feed fluid (injected solution) and inject the injected solution from the outer tube outer space into the ground. This is an example. 5 and 6, if the discharge resistance of the discharge port 12 is larger than the discharge resistance of the discharge port 11, the formation of the packer 3 and the injection from the outer tube injection port 16 to the ground are continuously performed after the packer 8 is formed. Is called. FIG . 2D is a view in which after the outer tube packer is formed, the inner tube is lowered and injected from the outer tube discharge port 16. FIGS. 1 to 6 are examples in which one outer tube packer is used to improve the ground below the present invention, and the present invention can be injected from a large columnar penetration (outer tube outer space), so that the injection range can be widened. For this reason, the outer tube packer of the first stage of the injection stage is used to form a consolidated body having a large permeation diameter by permeation from a large space outside the outer tube. According to the present invention, since a consolidated diameter of 1.5 to 4 m is maintained, the injection hole pitch can be 2 to 4 m, so that a 4 m consolidated layer can be constructed in one stage, so that it can be liquefied. Very suitable for prevention injection. That is, when the liquefied layer is 4 m, one stage can be made by a simple operation, and its usefulness cannot be measured including economic efficiency.

As shown in FIG. 1, FIG. 2, FIGS. 5 to 11, FIG. 13 and FIG . Accordingly, the outer tube diameter is reduced and the drilling hole diameter is reduced. Therefore, the hole cost is reduced, and the formation of the inner and outer tube packers and the injection into the ground can be continuously performed only by injecting the injection solution, and the construction cost can be greatly reduced.
Furthermore, if the porous and multistage simultaneous injection system shown in FIGS. 19 and 20 is used, a wide range of liquefaction prevention injection methods can be determined and completed in a short period of time.

7 to 9 show a typical structure example and construction method of the present invention using the outer tube 2 having a plurality of outer tube packers 3. (A) Insertion of the outer tube 2 into the drilling hole, (b) Insertion of the inner tube 6 into the outer tube, (c) Inner by feeding fluid (either injection liquid or packer fluid) into the inner tube. The tube packer 8 and the outer tube packer 3 are formed. (D) Shrinkage of the inner tube packer 8 by stopping fluid feeding or sucking out the fluid (the outer tube packer 3 does not shrink due to the presence of the check valve 4). (D) moves the inner tube upward to form the upper outer tube packer 3, and (E) shows the inner tube packer 8 with the inner tube packer 8 positioned across the outer tube inlet 16 leading to the outer tube outer space 22. Then, the injection solution is fed and injected into the ground through the outer space 22 outside the tube. In (f), the lowermost portion of the injection stage at the lowermost part of the outer tube may not have an outer tube packer. The injected liquid easily moves upward, and the upper part is constrained by the lowermost packer of the outer tube.

Figure 10 (a) and FIG. 12 shows an example of simultaneously injected outside the extravascular space 22 from the inner tube 6 into a plurality of injection stages between two or three or more of the outer tube packer 3. S ₁ indicates the discharge area of the inner tube packer discharge port 11, S ₂ indicates the discharge area of the discharge tube 12 between the inner tube packers, and S ₃ indicates the discharge area of the inner tube discharge port 28. The pair of inner tube packers 8 are located with the discharge port 12 between the inner tube packers interposed therebetween, and the discharge port 12 between the inner tube packers communicates with the discharge port 5 in the outer tube packer. The inner tube discharge port 28 communicates with the outer tube injection port 16. If the discharge port area is S ₃ <S ₂ <S ₁ (if a plurality of discharge ports are provided, the discharge areas S ₁ , S ₂ , and S ₃ may be the sum of them), the injection solution 7 is used as the inner tube. 6 , formation of the inner tube packer 8 → formation of the outer tube packer 3 → multistage simultaneous injection from the plurality of outer tube inlets 16 into the ground is automatically performed. In this case, if the inner tube is loosely inserted into the next stage and injected, simultaneous injection is performed in a number of multiple stages. In addition, S is a magnitude | size of discharge resistance force, Comprising: It does not necessarily need to be an area, A discharge port may be covered with seals, such as a rubber sleeve , and resistance objects, such as a cone, may be inserted. 11 (b) and 11 (c) are partial enlarged views of FIG. 12 (b).

In addition, this structure is characterized by providing a large number of outer tube packers on all long injection stages and inserting the inner tube into the outer tube and injecting it while it is set in place without moving the injection stage at once. It is possible to perform full depth injections. At this time, if the hydraulic conductivity of the ground is k ₁ , k ₂ (k ₂ <k ₁ ) for each injection stage, the injection amount per injection stage in one injection range is calculated from the porosity of each ground. it can. Porosity corresponding to permeability in each stage to the injection of the injection stage can be completed within the same time per one calculates the injection quantity, discharging as injection time is the same area S _3-1, The area of the inner pipe discharge port is prepared in advance so that S _3-2 (S _3-2 > S _3-1 ) is satisfied. Thus different permeability in each stage if, therefore, the amount of implanted despite different to definitive in each injection stage, it is obtained by the same injection time caking of the same design penetration diameter from top to bottom A groundbreaking ground improvement is possible.

For example, the k ₁ ground has a larger permeability coefficient than the k ₂ ground, and therefore, the gap is large, so if the same consolidation diameter is attempted , the injection amount of the k ₁ ground will be larger than that of the k ₂ ground. Same solid in order to be in so as to inject each of the ground is completed Yui径to allow the injection rate of k ₁ Ground greater than the injection rate of the k ₂ Ground the same time. FIG. 10 shows an expanded state of the inner tube packer. FIG. 11 shows an expanded state of the outer tube packer. When the injection pressure is the same, the injection speed from each inner tube discharge port 28 is proportional to the area of each inner tube discharge port. Therefore, the discharge area of the inner pipe discharge port 28 of k ₁ ground is S _3-1 , and the discharge area S _3-2 of the inner pipe discharge port 28 ′ of k ₂ ground is (S _3-1 > S _3-2 ) k. may be designed to an area of _{S 3-1} and _{S 3-2} as injection time and _{k 2} soil infusion period of ₁ ground are the same.
Therefore, if the injection solution 7 is fed from the inner tube 6 as S ₁ > S ₂ > S ₃ (S _3-1 > S _3-2 ), the inner tube packer 8 first expands, and then the outer tube packer 3. Then, the injection solution is injected from the outer tube discharge port 16 into the ground. k ₁ layer in accordance with the ratio of the infusion rate because there is greater permeability than _{k 2} layer _{S 3-1> S 3-2} if min infusion rate _{k 1} layers from larger _{k 2} layers _{S 3-1} The injection can be completed in the same time by appropriately designing S _3-2 .

FIG. 12 shows a structure in which an inner tube packer flow path 14 is provided in the inner tube 13 and the inner tube packer fluid 15 is used to expand the inner tube packer 8. After forming the inner tube packer, if the injection solution 7 is fed, S ₂ > S ₃
Therefore, the outer tube packer 3 is first expanded by the injection solution 7, and then the injection solution 7 is injected from the inner tube discharge port 28 through the outer tube discharge port 16 into the outer tube outer space 22, and further, the injection penetration into the ground is performed. k ₁ Permeability coefficient k ₁ Is k ₂ Permeability coefficient k ₂ If greater than k ₁ The discharge area S of the inner tube outlet 28 of the injection inner tube corresponding to the layer _3-1. K ₂ The discharge area S of the inner pipe discharge port 28 'corresponding to the layer _3-2 By making it larger than k ₁ Layer injection volume is k ₂ The injection is completed in the same injection time, even though it is larger than the injection amount of the layer, and k ₁ Layer, k ₂ The layers can also have the same consolidated diameter.

13 to 16, the formation of a plurality of outer tube packers 3 and the injection from the outer tube injection port 16 are automatically performed, or the injection tube is moved to perform the injection from the plurality of outer tube injection ports. An example is shown.

In FIG. 13 , the pair of inner tube packers 8 are inserted so as to sandwich the upper and lower outer tube packer discharge ports 5 and the outer tube injection port 16 sandwiched between the upper and lower outer tube packers 3. A fluid such as water is injected from the inner tube 6 to expand the inner tube packer 8 and the outer tube packer 3 and injected into the injection ground from the outer tube inlet 16 to measure the water permeability of the ground , and then the injection solution again. Can be injected from the inner tube to automatically form the inner tube packer and the outer tube inlet 16 to the ground.

In this case, if the injection solution 7 is sent to the inner tube 6 from the beginning, the formation of the inner tube packer 8 , the formation of the outer tube packer 3 , and the injection of the injection solution from the inlet 16 of the outer tube into the ground are automatically performed. It can be carried out.

In this case, the area of the discharge port in the figure is S ₁ > S ₂ , the discharge area of the outer tube injection port 16 is S ₅ , the discharge area of the discharge _{5 in} the outer tube packer is S _4, and S ₅ <S ₄ is designed. To do. When there are a plurality of discharge ports, the total area may be considered.
That is, after the inner tube packer body is formed, the injection liquid 7 flows into the upper and lower outer tube packers 3 from the upper and lower outer tube packer discharge ports 5 through the discharge ports 12 between the inner tube packers to form the outer tube packer body. After that, it is injected into the ground through the outer tube outer space 22 from the discharge port between the outer tube packers.

In this case, in FIG. 13 , the injection solution is injected from the instantaneous tube injection solution 16 or the suspension type injection solution through the outer tube injection port 16 so that the rough layer is preliminarily injected or coarsely combined with the instantaneous connection solution or suspension. It is possible to inject a long-injection type solution or a solution type injection solution having excellent permeability.

14 and 15 , the inner tube packer flow path 15 is provided in the injection inner tube 6, and the inner tube packer 8 is formed of a packer fluid. In FIG. 14, after the inner tube packer 8 is formed with the inner tube packer fluid 15, if the injection solution 7 is fed from the inner tube 6, the expansion of the outer tube packer 3 is followed by the injection from the outer tube inlet 16 to the ground. The liquid is done automatically. In the present invention, the injection inner pipe may be combined with a double pipe, a parallel pipe or a packer flow path. In this case, the liquid A and the liquid B are separately fed, so that an instantaneous liquid grout or an injection liquid having an arbitrary gel time can be injected according to the ground condition or the injection purpose. Thereafter, the long infusion solution can be injected by moving the stage downward as shown in FIG.

In FIG. 13 and FIG. 14 , since the liquid A and the liquid B can be combined and injected from the outlet of the outer pipe by feeding the injection liquid from the inner pipe to the double pipe, the gel time of the injection liquid can be adjusted freely. The primary injection with the instantaneous setting liquid can be performed, and when the long setting grout is injected and escapes to the ground surface or the like, the gel time can be freely shortened to prevent the escape. As shown in FIG. 15, the double pipe may be a parallel pipe or may be combined with a packer fluid line. Simultaneous injection of multiple injection stages and instantaneous injection and long-injection injection can be performed simultaneously.

FIG. 16 (a) shows a structure in which the discharge port of the outer tube pipe wall between the outer tube packers is covered with a water-permeable wall protective material 31, and FIG. 16 (b) is an elastic coating film 32 having a through hole. Covering the outer tube discharge port, so that the injection solution from the outer tube is uniformly distributed from the gap formed in the coating film and the outer tube wall over the entire drilling wall, and is injected evenly while protecting the hole wall Shows the structure. FIG. 16 (c) shows an example in which the net 26 is stretched over the packer.

FIG. 16 (c) shows that the rubber-like outer tube packer expands due to the injection pressure and expands so as not to be damaged, but the outer tube packer is covered with a water-permeable protective covering 33 such as a plastic net having pressure resistance. The structure which covered the discharge outlet is shown.

In the present invention, the injection tube may be inserted into the ground in the horizontal direction.
FIG. 19 is an explanatory view of the ground injection method according to the present invention using the injection liquid feeding device X. In FIG. 19 , similarly to the above, the ground 1 of the ground 1 is curved obliquely downward from the ground surface 2, and then the bored hole 3 is drilled in the horizontal direction. An outer pipe 7 having a plurality of outer pipe discharge ports 5, 5... 5 provided with a check valve 4 as shown in FIG. 1 is installed in the boring hole 3. Three or more expansion / contraction packers 8, 8... 8 are provided at intervals in the direction so that the expansion / contraction packers 8, 8 adjacent to each other serve as discharge positions 9, and the inner wall discharge port 10 has separate discharge positions 9. A plurality of infusion fluid channels 11 located at the same position, a packer channel 12 for supplying fluid to the expansion / contraction packer 8 for expansion or discharge and contraction, and an inner tube 13 formed independently inside each other are freely movable. And the discharge position 9 is matched with the outer tube discharge port 5, and then the fluid is sent to three or more expansion / contraction packers 8, 8... Thus, the inner space 15 is formed in the gap 14 between the expansion / contraction packers 8 and 8 adjacent to each other. Form, from the injection fluid feeding device X through the pipe space 15 and the outer tube discharge port 5 is injected into the ground 1 of the infusate through the inner tube the discharge port 10. In FIG. 8, detailed description of the outer tube 7 and the inner tube 13 is omitted, and a state where the inner tube 13 is movably inserted into the outer tube 7 is represented as an injection tube A.

The infusion solution delivery apparatus X shown in FIG. 19 includes a control unit 30, an infusion solution pressurizing unit 31, an infusion solution distribution unit 32, an infusion unit 33, and a solution delivery system. When the operation is performed manually, the control unit 30 is not necessary. Hereinafter, an example using the control unit 30 will be specifically described in detail.

As shown in FIG. 19 , the infusate pressurizing unit 31 pressurizes by an infusate pump 36 (grouting pump) from the infusate tank 35, and the infusate distribution unit 32 via the liquid feeding system 34 as a pressurized infusate. To liquid. The grout pump 36 receives an instruction from the injection monitoring board 30a of the control unit 30 and pressurizes the injected liquid to a desired pressure.

  The infusate distribution unit 32 includes a plurality of branch pipes 37, 37. Each of these branch pipes 37, 37... 37 has a connecting portion 38 connected to the injection pipe A at the tip. The connecting portion 38 may switch the branch pipe 37 to another injection pipe A when a predetermined injection amount is injected through a predetermined injection pipe A or when a predetermined injection pressure is reached. it can.

As shown in FIG. 19 , the branch pipes 37, 37... 37 described above are respectively extended from the distribution container 39 connected to the pressurizing unit 31 via the liquid feeding system 34, and are arranged at the tip. The connecting portion 38 is connected to the injection tube A. Then, the pressurized injection liquid from the pressurizing unit 31 is distributed to the branch pipes 37, 37... 37 through the distribution container 39 and sent to the injection pipe A. The distribution container 39 may be provided with a stirring device (not shown). Moreover, each branch pipe 37, 37 ... 37 can also be connected with the liquid feeding meter 34 from the pressurization part 31 immediately after not passing through the distribution container 39. FIG.

In FIG. 19 , the flow rate of the liquid flow meter 40 can be grasped by measuring the total amount of the branch flow meters f ₁ , f ₂ ... F ₁ , f _n. The total 40 is not necessarily required. Further, the liquid feeding pressure gauge 41 is not necessarily provided in the liquid feeding system 34 but may be provided in the distribution container 39 immediately after. V _{1 to} V ₄ are branch valves, P _{1 to} P ₄ are branch pressure gauges, 30 b is an operation panel 30 c is an injection recording board, 30 d is a data input device, and 42 is a liquid feed valve. Reference numeral 43 denotes a pressure cylinder for sending fluid to the expansion / contraction packer 8, and 44 denotes an inner pipe automatic elevator, both of which are connected to the control unit 30 and operate in response to an instruction from the control unit 30.

FIG. 20 is an explanatory view of the ground injection method according to the present invention using a multi-injection injection device as an injection solution delivery device, and an injection solution tank 35 for storing the injection solution and an independent motor or the like in each plant. Although not shown in the drawing, the unit pumps 46, 46... 46 operated by a common drive source 45 and connected to the control unit 30 are controlled, and these unit pumps 46, 46. The liquid feed pipes 47, 47,... A connecting portion 38 is provided at the tip of each liquid feeding pipe 47, 47... 47, and is connected to the injection liquid flow path 11 of the inner pipe 13 (not shown) of the injection pipe A inserted into the boring hole 3 of the ground 1. The injection liquid in the injection liquid tank 35 is pumped to the injection liquid flow path 11 of each injection pipe A at an arbitrary injection speed, injection pressure or injection volume by the operation of each unit pump 46, 46. The rubber sleeve 4 is pushed open from the tube discharge ports 5, 5. V is a branch valve. Pressure cylinder 43 and an automatic elevator 44 operates in response to an instruction from similarly controlled unit 30 as in FIG. 19.

7 to 14 , when injecting a consolidated material into the ground using an injection pipe device comprising an outer pipe and an inner pipe inserted into the outer pipe, the injection pressure in the injection pipe is conventionally positioned on the ground surface. It was measured with a pressure gauge.

  However, this injection pressure is actually the resistance pressure of the injection pipe and the resistance pressure of the inner pipe outlet added to the original ground injection pressure penetrating between the soil particles, It does not indicate. In particular, when the inner pipe discharge port is an injection port composed of fine holes, the inner pipe pressure increases due to the resistance force of the injection port, and the pressure in the actual ground cannot be grasped. There is a problem that the determination of whether or not the determination is made cannot be confirmed by the change in the injection pressure.

  In other words, this pressure is largely influenced by the liquid supply pressure in the ground part and the resistance pressure of the inner pipe flow path and the discharge port. It is unclear whether the ground has been destroyed and the infusion has gone.

Therefore, the present invention can directly and accurately grasp the injection pressure from the discharge port into the ground when injecting the consolidated material from the inner tube discharge port located between the inner tube packers through the outer tube discharge port. Is preferred.

For this reason, an outer pipe and an inner pipe inserted into the outer pipe, a ground injection device for injecting a caking material into the ground and solidifying the ground, wherein the outer pipe is placed on the surface of the outer pipe. The inner tube has a plurality of inner tube packers spaced apart from each other, and has an inner tube discharge port between adjacent inner tube packers, and the inner tube is placed in the outer tube. When inserting , using the injection tube device inserted so that the outer tube discharge port is located between the adjacent inner tube packers and a space is formed between the inner tube packers in the outer tube, A pressure transmission member that senses and transmits the internal pressure is installed in the injection device, and the pressure sensed in the space is transmitted and measured through the pressure transmission member, so that the accurate ground injection pressure can be grasped. it can.

Further, according to this injection tube device, the injection tube device comprises an outer tube and an inner tube inserted into the outer tube, and injects a consolidated material into the ground to consolidate the ground, The outer tube has one outer tube surface or a plurality of outer tube discharge ports at different positions in the axial direction, and the inner tube has a plurality of inner tube packers spaced apart from each other and is adjacent to each other. There is an inner tube outlet, and when inserting the inner tube into the outer tube, the inner tube is inserted so that the outer tube outlet is positioned between adjacent inner tube packers. In an injection tube apparatus in which a space is formed between packers, a strain resistance pressure sensor disposed in the space, an amplifier connected to the strain resistance pressure sensor via a signal cable, Pressure display device on the ground connected via signal cable A pressure transmission member consisting of is installed in the injection device, the pressure sensor senses the pressure in the space, and the sensed pressure in the space is transmitted to the pressure display device as an electrical signal through the signal cable through the amplifier and measured. And the precise injection pressure of the ground can be grasped .

Further, according to this injection tube device, the injection tube device comprises an outer tube and an inner tube inserted into the outer tube, and injects a consolidated material into the ground to consolidate the ground, The outer tube has one outer tube surface or a plurality of outer tube discharge ports at different positions in the axial direction, and the inner tube has a plurality of inner tube packers spaced apart from each other and is adjacent to each other. There is an inner tube outlet, and when inserting the inner tube into the outer tube, the inner tube is inserted so that the outer tube outlet is positioned between adjacent inner tube packers. In an injection tube apparatus in which a space is formed between packers, a strain resistance pressure sensor connected to the space through a tube, an amplifier connected to the pressure sensor, and a signal cable to the amplifier. Pressure transmission consisting of pressure display devices on the ground connected together The material is installed in the injection pipe device, and one end of the tube located in the space senses the pressure in the space, and the sensed pressure is transmitted to the pressure display device through the pressure sensor and the amplifier, and is measured. The accurate injection pressure of the inner pipe discharge port can be grasped .

  Furthermore, according to the ground injection method of the present invention, in the ground injection method for injecting a caking material into the ground and consolidating the ground, the surface has one outer tube discharge port or different in the axial direction. An outer tube having a plurality of outer tube discharge ports at a position, and an inner tube inserted into the outer tube and spaced apart from each other, and having an inner tube discharge port between adjacent inner tube packers When inserting the inner pipe into the outer pipe using a ground injection device comprising a pipe, an outer pipe discharge port is located between adjacent inner pipe packers, and a space is provided between the inner pipe packers in the outer pipe. Further, a pressure transmission member that senses and transmits the pressure in the space is installed in the injection device, and the pressure sensed in the space is transmitted through the pressure transmission member. Measure the transmitted pressure to determine the correct injection pressure at the inner pipe outlet. And characterized in that the grip.

  Further, in the present invention, a plurality of injection tubes can be installed in the ground, and the injection solution can be injected at the same time for multi-point injection.

  FIG. 21 is an explanatory diagram of the multi-point ground injection system X used in the present invention, in which a storage tank 22, a plurality of unit pumps 4, 4... 4 and a plurality of injection pipe devices A, A. A is basically provided.

  The storage tank 22 includes an A liquid tank 22a and a B liquid tank 22b, and has a structure in which the A liquid and the B liquid in these tanks are separately guided to the injection pipe device A and merged. Two injection pipe devices are arranged at the injection point 25 of the ground 1, and liquid A and liquid B are pumped to the two injection pipe devices A and A, respectively, and injected from the outer tube discharge port 5 to the injection point 25. After that, they merge in the ground 1 and react, or different types of injection solutions are injected simultaneously or with a time difference.

  The series of unit pumps 4, 4,... 4 includes a large number of independent unit pumps 4, 4,... 4 in one plant, and these unit pumps 4, 4,. The drive source 2 operates together as a set of injection devices by one centralized control device 3 and is connected to the A liquid tank 22a and the B liquid tank 22b via conduits 21, 21. .

  The injection pipe device A has an outer pipe discharge port 5 at the tip, and a plurality of the injection pipes A are embedded in a plurality of injection points 25, 25... 25 of the ground 1 and communicate with the A liquid tank 22a. .. 4 and unit pumps 4, 4... 4 connected to the B liquid tank 22b.

  FIG. 22 is an explanatory view schematically showing an injection system according to the present invention. The injection | pouring condition to the ground 1 of an injection liquid is understood modelly from FIG.

The above-described present invention automatically forms the inner tube packer and the outer tube packer, or automatically forms the outer tube packer and injects the injection solution from the outer tube inlet, or the inner tube injection solution. By automatically feeding the inner tube packer, the outer tube packer, and the injection solution from the outer tube inlet, the injection process is greatly simplified, or the hole diameter of the injection tube is reduced. By doing so, it is possible to reduce the diameter of the hole and greatly reduce the construction cost. Therefore, the present invention has high industrial applicability in the civil engineering field.

(A) It is explanatory drawing of this invention. Inserted state of the outer pipe into the ground. (B) A state in which the inner pipe is inserted into the outer pipe. (C) A state where the packer of the inner and outer pipes is expanded. (D) A state in which the inner pipe is lowered and the injection liquid is injected into the ground from between the inner pipe packers. (A) It is explanatory drawing of this invention. A state where the packer of the inner and outer pipes is expanded. (B) A state in which an injection solution is injected from the inner tube tip discharge port. The figure showing the injection | pouring state of this invention. The figure showing the injection | pouring state of this invention. (A) It is explanatory drawing of this invention. An outer tube with an outer tube packer installed in the drilling hole. (B) A state in which the inner pipe is inserted into the outer pipe. (C) The state in which the lower outer tube packer is expanded. (D) A state in which all of the outer tube packer and the inner tube packer are expanded. (E) A state in which the injection liquid is being injected into the ground from the discharge ports between the outer tube packers and between the inner tube packers. (F) The state in which the inner tube packer is moved downward and the injection solution is injected into the ground from between the inner tube packers. (A) It is explanatory drawing of this invention. (A) Drawing showing the relationship between the discharge area in the inner tube packer, the discharge area in the outer tube packer, and the discharge area of the inner tube. (B) and (C) are partial enlarged views of FIG. Drawing showing the relationship between the inner tube packer discharge area in the outer tube packer, the inner tube discharge area in the outer tube packer, the inner and outer tube discharge areas, and the ground layer. The drawing which showed the relationship between the discharge port area in an inner tube packer, the outer tube packer inner / outer tube discharge port area, and the outer tuber outer area of an inner tube and an outer tube. The drawing which showed the relationship between the discharge port area in an inner tube packer, the discharge port area in an outer tube packer, and the discharge port area outside a packer of an inner tube and an outer tube. Drawing showing the state of injection into the ground of instantaneous setting and long setting injection solution. (A) It is drawing showing the other example of this invention. (A) An example in which the outer tube discharge port is covered with a wall surface protective material. (B) An example in which the discharge port is covered with an elastic through-hole protective coating film. (C) An example of a net on a packer. (A) It is explanatory drawing of a prior art. The figure showing the state which is injecting injection liquid from between outer tube packers. (B) A drawing showing a state in which the outer tube packer is expanded by the double tube double packer. An example in which the injection tube is inserted horizontally into the ground. An example in which an injection tube is inserted horizontally into the ground using a multi-component injection device. The figure which showed one specific example of the multipoint ground injection system. Drawing which represented the multipoint ground injection system of the present invention typically.

DESCRIPTION OF SYMBOLS 1 Drilling hole 2 Outer injection pipe 3 Outer pipe packer 4 Check valve 5 Outlet outlet in outer pipe packer 6 Inner injection pipe 7 Injection liquid (fluid)
8 Inner tube packer 9 Outer tube wall 10 Inner tube tube wall 11 Inner tube packer discharge port 12 Inner tube discharge port A Injection tube device

Claims (20)

  In an injection pipe device for injecting an injection solution from an outer pipe inlet into an earth through an injection inner pipe from an injection outer pipe having an outer pipe packer installed in a drilling hole in the ground, the outer pipe packer is impermeable to water. It is a contraction packer, which is filled into the outer tube packer from the discharge port in the outer tube packer covered with a check valve provided on the tube wall of the injection outer tube in the outer tube packer through the injection inner tube. The inner tube has a plurality of inner tube packers, and the inner wall of the inner tube packer has a discharge port in the inner tube packer, and an inner tube wall between the inner tube packers. Has an inner tube discharge port, and the plurality of inner tube packers are loosely inserted into the outer tube so as to sandwich the outer tube discharge port, and a fluid is fed into the injection inner tube, whereby the inner tube An injection tube apparatus, wherein the fluid is filled into an outer tube packer from a space between packers to form an outer tube packer body.   The outer pipe has one or a plurality of outer pipe packers, and an outer pipe wall between the outer pipe packers has an outer pipe inlet covered with a check valve, and at least one outer pipe The lower part of the packer or the plurality of inner tube packers are positioned so as to sandwich the discharge port in the outer tube packer of the outer tube packer, and the outer tube packer is fed from the injection inner tube, and is discharged from the discharge tube in the outer tube packer into the outer tube packer. 2. The injection pipe device according to claim 1, wherein the outer pipe packer body is expanded by the fluid filled in the outer pipe, and further, the fluid is injected into the ground from the outer pipe inlet through the space between the inner pipe packers.   The outer tube has a plurality of outer tube packers, an outer tube wall between the plurality of outer tube packers has an outer tube injection port covered with a check valve, and the plurality of inner tube packers The plurality of inner tube packers are expanded by the fluid from the inner tube packer flow path, and the outer tube packer is fed from the injection inner tube and the outer tube packer is placed. 2. The injection tube device according to claim 1, wherein the outer tube pack body is formed by expansion by an injection solution filled in the outer tube packer from the inner discharge port, and the injection solution is injected into the ground from the outer tube injection port.   The inner tube packer is a water-impermeable and expandable packer and has an inner tube packer discharge port located in the inner tube packer, and the inner tube discharge port is more resistant to discharge than the inner tube packer discharge port. The inner tube packer expands to form an inner tube packer inner space through which the fluid is filled into the outer tube packer. 2. The injection tube device according to claim 1, wherein the outer tube packer is expanded to form an outer tube packer body.   2. The injection tube device according to claim 1, wherein the inner tube packer is expanded by the inner tube packer fluid from the inner tube packer fluid flow path.   3. The injection tube apparatus according to claim 1 or 2, wherein the injection outer tube has one or a plurality of outer tube packers, and an outer tube inlet is provided at least below the outer tube packer or between the plurality of outer tube packers. Injection tube device. Outer extravascular space inner tube discharge opening area S ₃ which opens in the outer tube space communicating with opened outer tube inlet to the discharge resistor is greater than the inner tube packer between the outlets of the area S _2, S 3 _{<S 1} , S ₂ <S ₁ .   The injection pipe device according to claim 1, further comprising an outer pipe and an inner pipe inserted into the outer pipe, and injecting a caking material into the ground to consolidate the ground. The inner tube has a plurality of inner tube packers spaced apart from each other, and has an inner tube discharge port between adjacent inner tube packers, and the inner tube is placed in the outer tube. In the injection tube device, the outer tube discharge port is located between adjacent inner tube packers and the space is formed between the inner tube packers in the outer tube. A pressure transmission member that senses and transmits the pressure is installed in the injection device, the pressure sensed in the space is transmitted to the pressure gauge through the pressure transmission member, and the transmitted pressure is measured to measure the ground injection pressure. The infusion tube apparatus according to claim 1, wherein   The pressure transmission member is a tube, and one end is located in the space to sense the pressure in the space, and the other end is connected to a pressure gauge on the ground, and the sensed pressure in the space is measured by the pressure gauge. The injection tube device according to claim 8.   9. The injection tube device according to claim 8, wherein the tube is installed through an inner tube.   9. The injection tube device according to claim 8, wherein one end of the tube located in the space is covered with a film.   12. The injection tube device according to claim 11, wherein the tube is filled with a liquid, and the pressure in the space sensed by the membrane is measured with a pressure gauge through the liquid.   In the ground injection method in which an injection solution is injected from the outer tube inlet into the ground through the injection inner tube to the injection outer tube installed in the ground drilling hole, the injection outer tube is an outer tube packer body on the outer tube wall One or a plurality of stretchable outer tube packers that form a gap, and an outer tube filler is provided in the outer tube packer below or outside the outer tube packer. An outer tube packer discharge port covered with a check valve that opens inside, and the injection inner tube to be inserted into the outer tube is formed of a stretchable inner tube bag that forms a plurality of inner tube packers. A plurality of intermediate discharge ports are provided, and a fluid is supplied to the inner tube, whereby the inner tube bag body is expanded by the fluid pressure of the fluid discharged from the inner tube bag discharge port to form an inner tube packer. The outer pipe from the outlet in the outer pipe packer through the space between the inner pipe packer formed thereby Ground grouting method, wherein a fluid is filled outer tube packer body is formed in Tsu the mosquitoes.   A ground injection method in which a plurality of injection pipe devices are buried in the ground, and an injection solution is injected through these injection pipe devices, which are operated by an independent drive source and individually controlled by a central control device. In the ground injection method in which unit pumps are connected to each injection pipe device, and the injection liquid is injected into the ground by the operation of the unit pump, the injection pipe devices are expanded with a curable fluid at intervals in the longitudinal direction of the pipe wall. A plurality of bag packers that have at least one outer tube discharge port covered with a rubber sleeve between adjacent bag packers, and an extra-tube space between the adjacent bag packer and the drilled wall And an inner tube that is movably inserted into the outer tube and is provided with a pair of expansion / contraction packers spaced apart in the longitudinal direction to form a discharge position. The injection liquid is fed and the discharge port is An infusate flow path located at the exit position and a packer flow path for sending and inflating fluid to the expansion / contraction packer are provided independently, and the fluid is sent to the pair of expansion / contraction packers through the packer flow path for expansion. A space between the inner and outer pipes sandwiched between the pair of expansion / contraction packers is formed, the pipe inner space is made to coincide with the outer space of the pipe, and the injection liquid is supplied from the outer pipe outlet to the inner space, the outer pipe outlet and the pipe. 14. The ground injection method according to claim 13, wherein the ground injection method is injected into the ground through an outer space.   The central control device is connected to the packer flow path, and is connected to a fluid feed control unit for controlling the fluid feed to the pair of expansion / contraction packers, and to the drive sources of a plurality of independent unit pumps. Connected to a drive control unit for controlling the flow rate and a flow rate pressure detector arranged in a conduit leading from each unit pump to the injection pipe device in the ground, and records and displays injection information relating to injection pressure, injection volume and injection speed The ground injection construction method of Claim 13 provided with the display part.   The inner pipe is provided with a packer fluid feeding flow path, and the packer fluid is fed into the packer fluid feeding flow path to form an inner pipe packer, and the inner pipe is formed in the space between the inner pipe packers formed thereby. 14. The ground injection method according to claim 13, wherein a fluid is further fed to fill the outer tube packer with the fluid to form an outer tube packer body to form an outer tube packer.   Ground injection method in which injection solution is injected into the ground through an injection inner tube having a plurality of expandable inner tube packers from an injection outer tube having an impervious expandable outer tube packer installed in a drilling hole in the ground. The outer tube wall has one or a plurality of outer tube inlets, and the inner tube packer is positioned so as to sandwich a plurality of outer tube packer discharge ports adjacent to the inner tube in the outer tube, In the outer tube packer, an outlet in the outer tube packer having a check valve is provided, and an inlet between the outer tube packers having a check valve on the outer tube wall between the outer tube packers. The inner tube packer is expanded by feeding a fluid into the injection inner tube, and then flows from the discharge port between the inner tube packers to the upper and lower outer tube packers through the discharge port in the outer tube packer. A packer body is formed, and an injection solution is injected from an outer tube inlet opening between the outer tube packer bodies. Ground injection method. The ground injection method according to claim 17, wherein the injection solution is non-alkaline water glass grout, colloidal silica grout, activated silica grout, or grout having a gelation time of 1 hour or more.   The injection inner tube is positioned such that a plurality of inflatable inner tube packers sandwich the outer tube packer inner / outer tube discharge ports, and further, the inner tube packer has packer discharge ports, and the interval is set. By using an injection inner tube having an inner tube having an inner tube discharge port that communicates with the outer tube discharge port between the inner tube packers that are provided open, and sending the injection solution to the inner tube flow path, The compressible inner tube packer is expanded by the feeding pressure of the injection solution to form an outer tube inner space between the plurality of inner tube packers, and the injection solution is discharged from the inner tube discharge port into the outer tube inner space. 18. The ground injecting method according to claim 17, wherein the tube bag body is inflated to form an outer tube packer body, and the ground is consolidated by injecting an injection solution from the outer tube inner space through the outer tube discharge port into the ground from the outer tube packer outer space. . The ground injection construction method according to claim 17, wherein the inner pipe packer according to claim 17 is formed by a packer fluid from the flow path for the inner pipe packer.