JP2005083002A - Ground grouting method and method of anchoring injection pipe to ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground grouting method which prevents caving of a drilled wall by injecting infusion liquid simultaneously from a plurality of discharge ports, secures an injection infiltration source of a boring hole to achieve uniform infiltration and hardening, to thereby carry out ground improvement in a wide range in a short period of time. <P>SOLUTION: According to the ground grouting method, the boring hole 11 in an arbitrary form is drilled in the ground at a location where ground improvement should be carried out, and a plurality of flexible injection fine tubes 12 are bound together as a flexible bound injection pipe 14 so that their discharge ports are located at axially different locations, and inserted into the boring hole 11. Then the injection liquid is simultaneously injected from an injection liquid feeding device A set on the ground surface 9, via the respective discharge ports 13 into the ground 10, and in this manner consolidation of the ground is achieved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to ground injection methods such as soft ground, leaky ground, ground that may be liquefied, contaminated ground, etc., in particular, support ground under existing structures that are difficult to perform ground injection, bottom of waste disposal site or More specifically, the method of injecting into the reservoir pond, reservoir, etc., in particular, quickly and reliably and economically injecting the support ground under existing structures that are difficult to inject ground, in subsidence or during earthquakes The present invention relates to a ground injection method capable of preventing liquefaction of the ground in advance, further preventing elution of harmful substances from the waste disposal site, and further preventing leakage from a reservoir or a reservoir.

In general, the ground is laminated in a plane to form an alluvium with a low relative density. In other words, the ground has a larger hydraulic conductivity in the horizontal direction than in the vertical direction. When the injection solution is injected into such ground, the injection solution is easily diffused in a plane. On the other hand, in the past, when the ground was injected, the injection solution was injected one stage at a time, but in such injection, the injection solution from one point spreads widely in a plane, and the injection solution from the next point is At the same time as the injection, it immediately communicates with the previously injected point. Since the injection solution spreads around this, it tends to become an unspecified shape, and it has been difficult to form a flat or columnar consolidated body having a predetermined width and thickness at a predetermined position. In addition, the injection solution from one point runs through a large horizontal water-permeable layer or boundary surface, and penetrates and solidifies to an adjacent injection point before injection. For this reason, even if it is going to inject | pour from the injection | pouring point, injection | pouring becomes impossible or it will be in an irregular penetration | infiltration state, and it will be hard to obtain the solidified body of a predetermined shape.
JP 2001-323451 A JP2000-45259

  The present inventor, in the ground injection method to improve the stagnant ground in the horizontal direction like the liquefaction countermeasures of the foundation of the building, the problem that the injection solution is likely to irregularly permeate and run away, the multiple selection of the injection solution The present inventors have found that a solid body having a predetermined shape is formed at a predetermined position by simultaneously injecting and penetrating from the injection pipe outlet, and the present invention has been completed.

  Therefore, the object of the present invention is to rapidly consolidate into a certain shape by injecting from an infusion tube installed in a horizontal direction, such as infusion for liquefaction measures to consolidate the ground below the building. By simultaneously injecting the injection solution from a plurality of selected outlets, it is possible to achieve uniform penetration and consolidation at a predetermined position and in a predetermined shape, and a wide range of ground improvement. An object of the present invention is to provide a ground injection method which can be constructed in a short period of time and which has improved the above-mentioned drawbacks of the known technology.

  In order to achieve the above-mentioned object of the present invention, according to the present invention, a flexible injection tube having a plurality of discharge ports formed in a borehole having an arbitrary shape drilled in a portion of the ground to be improved. The injection solution is injected through each of these discharge ports, and the ground is consolidated by simultaneously injecting the injection solution from the injection solution feeder into the ground through any of a plurality of discharge ports.

  Furthermore, in order to achieve the above-described object, according to the present invention, a boring hole having an arbitrary shape is drilled at a location to be improved in the ground, and a plurality of flexible injection capillaries are inserted into these boring holes. Insert a flexible bundling injection tube that is bundled so that the outlets are located at different locations in the axial direction, and feed the injected liquid through these discharge ports from the injection liquid feeding device installed on the ground or shaft space into the ground Injecting simultaneously through any of a plurality of discharge ports to consolidate the ground, the injection solution feeding device includes an injection solution pressurizing unit and a plurality of branches leading to the plurality of flexible injection tubules An injection solution distribution unit that has a tube and distributes the pressurized injection solution from the pressurization unit to each branch tube; and a feeding system for the pressurized injection solution that leads from the injection solution pressurization unit to the injection solution distribution unit A liquid flow meter and / or a liquid pressure gauge provided in the liquid supply system. The injection liquid pressurizing unit is operated based on information from the liquid supply flowmeter and / or the liquid supply pressure gauge, and the injection liquid is supplied into a single liquid supply system with a predetermined flow rate or pressure of the pressurized injection liquid. It is characterized by rapidly and surely improving a wide range of ground by simultaneously feeding and injecting into a plurality of injection capillaries.

  Furthermore, in order to achieve the above-described object, according to the present invention, a boring hole having an arbitrary shape is drilled in a portion to be improved on the ground, and a plurality of flexible injection capillaries are placed in these boring holes. Insert a flexible bundling injection tube that is bundled so that the discharge ports are located at different locations in the axial direction, and pass the injection solution through each of these discharge ports, and pass through any plurality of discharge ports from the injection solution feeder to the ground. It is characterized by simultaneously injecting and solidifying the ground, and the infusion solution feeding device is provided in a large number of infusion solution tanks and one plant, each connected to the infusion solution tank, and with an independent drive source. A multi-injection apparatus comprising a unit pump that is operated and controlled by a control unit, and a conduit that is connected to each of the unit pumps and that is connected to a plurality of capillaries of the boring hole, respectively. Independent A large number of unit pumps are each provided with a rotational speed transmission controlled by a control unit, and a flow rate pressure detector is provided in the conduit, whereby signals of flow rate and / or pressure data from the flow rate pressure detector are provided. Is sent to the control unit, and the injection liquid in the injection liquid tank is pumped to each injection capillary at an arbitrary injection speed, injection pressure or injection volume by the operation of each unit pump. It is characterized by injecting.

  Furthermore, in order to achieve the above-mentioned object, according to the present invention, a boring hole having an arbitrary shape is drilled at a place to be improved in the ground, and a plurality of flexible injection capillaries are provided in these boring holes in these discharge ports. Insert a flexible bundling injection tube that is bundled so as to be located at different locations in the axial direction, and inject the injection solution through each of these discharge ports, and simultaneously inject the injection solution from the injection solution feeder into the ground through any of a plurality of discharge ports The infusion solution feeding device includes an infusion solution tank, a multi-unit pump having a number of unit pumps in one plant, and the flexible bundling infusion tube of the ground. The infusion tank is connected to each unit pump of the multi-unit pump, each unit pump is connected to a plurality of liquid pipes, and the multi-unit pump is a single drive source. The rotating shaft to be driven It consists of a number of cams of arbitrary shape fixed to the rotating shaft and a number of unit pumps that are connected to these cams via tappets and operate according to their respective cam drive systems. The cam is driven by the rotation of the rotating shaft. Then, the unit pump is operated, and the injected liquid is sucked from the suction port at an arbitrary discharge speed and discharged to the discharge port.

Furthermore, in order to achieve the above-mentioned object, according to the present invention, a boring hole having an arbitrary shape is drilled in a portion to be improved on the ground, and a flexible injection tube is inserted into the boring hole, and these discharge ports are provided. The flexible injection tube is fixed to the ground by the following steps (a) to (d), in which the injection solution is injected into the ground and the ground is consolidated. It is characterized by that.
(A) A boring rod with a drill head attached to the tip is inserted into the casing, and the casing is installed in the ground together with the boring rod while drilling the ground.
(B) Pull out the boring rod and install only the casing in the ground.
(C) An injection tube having a plurality of discharge ports is inserted into a casing installed in the ground.
(D) Pull out only the casing from the ground and fix the injection tube in the ground.

  In the ground injection method according to the present invention, an injection material is simultaneously injected from a plurality of selected outlets, in particular, from a plurality of selected outlets of a plurality of flexible injection pipes installed in horizontal boring holes. Thus, further detailed description will be made with reference to FIGS. 5 and 10, which will be described later. Since the layers different in plane are laminated on the soft ground, the water permeability is large in the horizontal direction. For this reason, when it injects sequentially from one injection | pouring point, it osmose | permeates radially centering | focusing on the injection | pouring point, and permeation | spreading will spread easily to the adjacent injection pipe discharge port. Therefore, when injecting from the adjacent discharge port after that, it becomes very unclear how the infusion solution permeates due to the infiltration state of the infusion solution previously injected, and permeates and solidifies into a predetermined shape. It becomes difficult. On the other hand, as shown in FIG. 10, by simultaneously injecting from a plurality of discharge ports, the permeation flow of the injection solution from each discharge port is restrained and permeates as a laminar flow in a certain direction. For this reason, a solid flat solid body is formed. Furthermore, when the simultaneous injection in the vertical direction of FIG. 5 is combined, a solid body having a predetermined shape is formed three-dimensionally. By simultaneously injecting from a plurality of discharge ports selected both planarly and vertically based on this principle, a permeation consolidated shape having a specific shape can be obtained at a predetermined location. The form of infiltration can be controlled to enable uniform infiltration and consolidation into a predetermined shape, and a wide range of ground improvement can be applied in a short period of time. In particular, the present invention injects the injection solution from the injection solution pressurizing unit through the plurality of injection solution delivery systems to the injection point in the ground, and the plurality of injection solution delivery systems are provided with a flow pressure detector. The flow rate and / or pressure data of the infusate detected from the detector is transmitted to a centralized control device equipped with an infusion monitoring board, and the infusion status from the infusate feeding system is displayed on the screen of the infusion monitoring board, While performing batch monitoring, performing injection from a plurality of selected injection points simultaneously, grasping the state of each injection, performing the process from the start to the end of each injection line separately, and Since the entire injection management can be performed, a solid body having a predetermined shape can be formed at a predetermined place based on the behavior of the injection liquid in FIGS.

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

  FIG. 1 is an explanatory view showing a basic diagram of the injection method of the present invention, and an injection liquid 2 to be injected into an injection liquid tank 1 is filled. The injection solution tank 1 can be equipped with a stirring device 3. The infusate in the infusate tank 1 is fed through the conduit 5 by the operation of the pump 4. A flow meter 6, a pressure gauge 7, and a recording meter 8 are installed in the conduit 5, and the amount of injected liquid is adjusted based on information from the flow meter 6 and / or the pressure gauge 7. In this way, the injection liquid feeding apparatus A is installed on the ground surface 9.

  On the other hand, in FIG. 1, a portion of the ground 10 to be ground is bent obliquely downward from the ground surface 9, and then a bore hole 11 is drilled in the horizontal direction. A flexible structure in which a plurality of flexible injection capillaries 12, 12... 12 are bundled in the boring hole 11 so that the discharge ports 13, 13. The bundling injection pipe 14 is inserted, and the injection solution from the conduit 5 is simultaneously injected into the ground 10 through the selected plurality of discharge ports 13, 13.

  FIG. 2 is an explanatory view of the ground injection method according to the present invention using a unique injection liquid feeding device. In FIG. 2, as in FIG. 1, a plurality of arbitrary boring holes 11 are drilled in a portion to be improved on the ground 10, which is bent obliquely downward from the ground surface 9 and then horizontally. A flexible structure in which a plurality of flexible injection capillaries 12, 12,... 12 are bundled in the boring hole 11 so that the discharge ports 13, 13. Through the selected multiple outlets of these outlets 13, 13... 13 from the injection liquid feeder A installed on the ground surface 9 in the ground 10. At the same time, the ground 10 is consolidated.

  The infusion solution delivery apparatus A shown in FIG. 2 includes a control unit 8, an infusion solution pressurizing unit 15, an infusion solution distribution unit 16, an infusion unit 17, and a solution delivery system 18. When the operation is performed manually, the control unit 8 is not necessary. Hereinafter, an example using the control unit 8 will be described in detail.

  As shown in FIG. 2, the infusate pressurizing unit 15 pressurizes the infusate from the infusate tank 1 with a pump 4 (grout pump), and as the pressurized infusate via the liquid feeding system 18, the infusate distribution unit 16 is sent. The grout pump 4 receives an instruction from the injection monitoring board 8a of the control unit 8 and pressurizes the injected liquid to a desired pressure.

  The injection solution distribution unit 16 includes a plurality of branch pipes 20, 20. These branch pipes 20, 20... 20 each have a connecting portion 21 connected to the flexible injection thin tubes 12, 12. The connecting portion 21 replaces the branch pipe 20 with another injection capillary 12 when a predetermined injection amount has been injected through the predetermined flexible injection capillary 12 or when a predetermined injection pressure is reached. You can also

As shown in FIG. 2, the branch pipes 20, 20... 20 described above are arranged to extend from the distribution container 22 connected to the pressurizing unit 15 through the liquid feeding system 18, and are connected at the tip. 21 is connected to the injection capillary. And the pressurization injection liquid from the pressurization part 15 is distributed to each branch pipe 20, 20 ... 20 via the distribution container 22, and is sent to the injection thin tube 12. FIG. The distribution container 22 may be provided with a stirring device (not shown). Each of the branch pipes 20, 20... 20 can be directly connected to the liquid feeding system 18 from the pressurizing unit 15 without passing through the distribution container 22. In FIG. 2, the flow rate of the liquid flow meter 6 can be grasped by measuring the total amount of the branch flow meters f ₁ , f ₂ ... F _i , f _n. 6 is not necessarily required. Furthermore, the liquid pressure gauge 7 is not necessarily provided in the liquid supply system 18 but may be provided directly in the distribution container 22. V _{1 to} V ₄ are branch valves, P _{1 to} P ₄ are branch pressure gauges, 8 b is an operation panel, 8 c is an injection recording board, and 8 d is a data input device.

  FIG. 3 is an explanatory view of the ground injection method according to the present invention using still another injection liquid delivery device. The infusion solution delivery apparatus A includes a control unit 8, an infusion solution pressurizing unit 15, an infusion solution distribution unit 16, and a delivery system 18. The injection liquid pressurizing unit 15 and the control unit 8 are the same as those in FIG.

  Similarly to FIG. 2, the infusate distribution unit 16 also includes a plurality of branch pipes 20, 20. Each of the branch pipes 20, 20... 20 has a connecting portion 21 that connects to the flexible injection thin tubes 12, 12. As shown in FIG. 3, these branch pipes 20, 20... 20 are respectively extended from the distribution container 22 connected to the injection liquid pressurizing unit 15 via the liquid supply system 18, and connected at the tip. The portion 21 is connected to the injection capillary T. And the pressurization injection liquid from the pressurization part 15 is distributed to each branch pipe 20, 20 ... 20 via the distribution container 22, and is sent to the injection thin tube T. In FIG. 3, 0 is an orifice.

As shown in FIG. 4, the infusion solution delivered by the infusion solution delivery apparatus A in FIG. 3 is a bore hole 11, T ₁₁ , T ₁₂ , T _1i , T _{1n in which} a bundled infusion tube 14 is inserted. ₂₁ , T ₂₂ , T _2i , T _2n bundling injection tube 14 is inserted, and T _n1 , T _n2 , T _ni , T _nn bundling injection tube 14 is inserted into boring hole 11. It is injected in layers through the injection tubules. Such injection is performed by selecting an arbitrary portion of the ground 10 to be injected, such as the first injection block and the second injection block.

FIG. 5 is an explanatory diagram showing a state where the layers are injected into the ground in a layered manner and consolidated, and the first injection layer composed of T ₁₁ , T ₁₂ , T _1i , T _1n , T ₂₁ , T ₂₂ , T The first injection block is formed by the second injection layer made of _2i and T _2n and the _n injection layer made of T _n1 , T _n2 , T _ni and T _nn , and the second injection block is formed in the same manner.

  FIG. 6 is an explanatory view of the ground injection method according to the present invention using a multi-injection injection device as an injection solution feeding device, and an injection solution tank 1 for storing the injection solution and an independent motor or the like in each plant. .., Which are operated by the drive source 25 and connected to the control unit 8 and controlled, and the unit pumps 24, 24... 24 are extended and arranged. The liquid supply pipes 20a, 20a,. A connecting portion 21 is provided at the tip of each liquid feeding tube 20a, 20a... 20a, and is connected to the injection thin tube 12 of the bundling injection tube 14 inserted into the boring hole 11 of the ground 10. The infusion liquid in the infusion liquid tank 1 is pumped to each of the injection capillaries 12, 12... 12 at an arbitrary injection speed, injection pressure or injection volume by the operation of each unit pump 24, 24. Multiple points are simultaneously injected into the ground 10 from the outlets 13, 13.

7 is connected to the injection capillary tube T at the connecting portion 21 at the tip of the branch pipe 20 in the same manner as in FIG. This is an example of feeding the liquid. The injection solution sent to the injection capillary T is T ₁₁ , T ₁₂ , T _1i , T _1n as in FIG.
Boring holes 11, T ₂₁ , T ₂₂ , T _2i , T _2n into which the bundling injection tubes 14 are inserted, and T _n1 , T _n2 , T _ni , T _nn. The bundling injection tube 14 is inserted into the hole 11 in a layered manner through the respective injection capillaries. Similar to FIG. 5, such injection is performed by selecting an arbitrary portion of the ground 10 to be injected, such as the first injection block and the second injection block.

  FIG. 8 shows an example in which a multi-unit pump that operates a large number of unit pumps with a single drive source is used as the unit pump of FIG. 6, and an infusion tank 1 similar to FIG. 6 and a large number of units in one plant. As shown in FIG. 6, the multi-continuous pump 32 including the pumps 24, 24... 24 and the liquid feeding pipes 20 a, 20 a. The

  The infusion tank 1 (not shown) is connected to the suction ports 39, 39... 39 of the unit pumps 24, 24... 24 of the multiple pump 32, and the unit pumps 24, 24. .. Are connected to a plurality of liquid feeding pipes 20a, 20a... 20a (not shown) through 40, 40.

  The multi-connected pump 32 has a single drive source, for example, a rotary shaft 33 driven by a motor 36 via a speed governor 37 and a joint 38, and a number of cams 34, 34,. 34 and a plurality of unit pumps 24, 24... 24 connected to these cams 34 via tappets 35 and operating according to the respective cam drive systems. The unit pump 24 is driven to operate, and the injected liquid is sucked from the suction port 39 at an arbitrary discharge speed and discharged to the discharge port 40.

  The injection method according to the present invention is particularly suitable for processing under a structure such as a building. For example, a plurality of layers can be laminated in the depth direction below the structure 29 as shown in FIG. 9, or, further, as shown in the plan view of FIG. Can be set in parallel, or can be set in the depth direction as shown in FIG. 5 to form a plurality of layers. The present invention, together with the technique of simultaneously injecting the permeation behavior of FIG. 10 from a plurality of discharge ports, injecting the injection liquid from the injection liquid pressurizing unit through the plurality of injection liquid feeding system to the injection point in the ground, A plurality of infusion solution delivery systems are provided with flow rate pressure detectors, and the infusion solution flow rate and / or pressure data detected from these detectors is transmitted to a centralized control device equipped with an infusion monitoring panel for infusion solution delivery. The injection status from the liquid system is displayed on the screen of the injection monitoring panel, and while performing batch monitoring, injection is performed simultaneously from a plurality of selected injection points, and each injection status is determined by checking the status of each injection. Since the process from the start to the end can be performed separately and the entire injection management can be performed, a predetermined location is determined based on the behavior of the injection solution in FIGS. It can form a consolidated body shape.

  Furthermore, as shown in FIG. 11, in the present invention, the bag packer 28 can be attached when the bundling injection tube 14 is inserted into the boring hole 11. In this case, the bag packer 28 is formed by bundling a plurality of injection capillaries 12, 12,... At this time, a space 41 is formed between the bag packers 28 and 28, and the injected liquid is injected into the ground 10 through this space 41. Generally, a caking liquid such as cement is used as the fluid.

  Furthermore, as shown in FIG. 12, when the bundling injection tube 14 is inserted into the boring hole 11, the present invention fixes a plurality of injection capillaries 12, 12,... A seal 30 such as cement / bentonite grout can be filled between the wall 31 and the bundle injection pipe 14. In this case, the injection liquid breaks the seal 30 from the discharge port 13 and is injected into the ground 10.

  FIG. 13 shows an example in which the bag packer 28 is mounted and the seal 30 is also filled. Also in this case, the injected liquid is injected into the ground 10 by breaking the seal between the bag packers 28 and 28.

  FIG. 14 is a basic schematic diagram of not only a structure such as a building but also a waste disposal site, a reservoir, a reservoir, and the like, which should be improved directly under an inanimate body that cannot be moved. 14 such as a ground, a reservoir, a reservoir, or the like, bent from the ground surface 9a near the ground 10a to be improved directly under the immovable inanimate body 42 into the ground 10, or a combination of bending and straight lines. First, it bends diagonally, and then forms a straight line on the ground 10a to be improved immediately below the inanimate body 42, and then continues to bend diagonally, drilling to the near ground surface 9a on the opposite side, 11 is formed.

  Next, the flexible bundling injection tube 14 is inserted into the boring hole 11 of FIG. 14, the injection material is discharged from these discharge ports, and injected into the ground 10 to be fixed to the ground 10a to be improved immediately below the inanimate body 42. A tie area 43 is formed.

  FIG. 15 is also another basic schematic diagram according to the present invention, and is an example in which the conventional vertical drilling hole 101 and the diagonally straight diagonal drilling hole 102 are combined with the curved (bent) boring hole 11. . In this method, since the boring hole 11 of the present invention is further used in combination with the conventional technique, the ground 10a to be improved is more firmly and quickly consolidated to form a consolidated region 43.

  FIG. 16 is a plan view of a specific example of the flexible bundling injection tube 14 used in the present invention, and a plurality of flexible injection thin tubes 12, 12,... .. Are formed by binding with a band 27 so that 13 is located at different positions in the axial direction. Further, as shown in FIG. 16, the flexible bundling injection tube 14 can be bundled together with a plurality of flexible injection thin tubes 12, 12,... The bag packer 28 may be covered on any one of the plurality of discharge ports 13, 13. The state in which the bag packer 28 is expanded to form a packer will be described later. In addition, although not shown, the flexible binding injection tube 14 may be provided with a spacer in order to maintain an arbitrary distance from the hole wall 31 of the boring hole 11.

  As this type of flexible core material 44, it is sufficient that the flexible bundling injection tube 14 is pulled into the boring hole 11 and has sufficient strength and flexibility not to be pulled. The material may be any material such as a synthetic resin or a metal. Note that the flexible core material 44 is not necessarily required if the plurality of flexible injection capillaries 12 have a tensile strength such that one or more of the flexible injection tubes 12 can replace the core material.

  In the present invention, boring is performed almost horizontally below the ground 10a to be improved using a guided horizontal boring method described later. That is, first, in FIG. 14 and FIG. 15, a boring rod having a drill head 45 shown in FIG. 17a described later is pushed in from the ground surface 9a near the ground 10a to be improved below the inanimate body 42 while rotating the rod. And drilled into an oblique straight line by pressing.

Next, the bit inclined surface at the tip of the drill head 45, that is, the tip tapered blade 46 is adjusted in a bending direction, and the curved portion is drilled by jetting and pushing. Subsequently, the horizontal portion is drilled by rotating and pushing the boring rod, and if necessary, the drilling is performed in a slanting straight line to the near ground surface 9a on the opposite side of the inanimate body 42.

  The actual drilling using the drill head 45 shown in FIG. 17 will be described with reference to FIG. First, as shown in FIG. 18A, the starting pile 47 is formed on the nearby ground surface 9a, and the boring machine 48 is installed. Next, a grounding rod 10a to be improved while rotating the drill head 45, the boring rod 49 provided with the drill head 45 shown in FIG. Push in and drill. At this time, the boring rod 49 is drilled while being inserted into the casing 50. When bending the hole, as shown in FIG. 17B, the hole is adjusted by adjusting the tip tapered blade 46 in the bending direction. This drilling may be performed until reaching the near ground surface 9a on the opposite side, but as shown in FIG. 18, it is sufficient to perform the drilling to the end of the ground 10a to be improved.

  Subsequently, the boring rod 49 is pulled out, and only the casing 50 is left in the ground as shown in FIG. At this time, the hole drilling is protected by the casing 50.

  Subsequently, as shown in FIG. 18 (c), the flexible binding injection tube 14 is inserted into the casing 50. The injection tube 14 covers the bag packers 28 and 28 at the tip, that is, the discharge port 13 located in the back of the ground 10a to be improved and the discharge port 13 located in front. When these bag packers 28, 28 are inflated, they become bag packers 28, 28 as shown in FIG. 18 (d), and the casing 50 is pulled out, and as shown in FIG. 18 (e), between the bag packers 28, 28. Is injected from the discharge ports 13, 13,... 13 to efficiently improve the ground 10a to be improved.

  Further, ground boring at other sites will be described. First, as shown in FIG. 19, a boring head 51 for jetting a drilling fluid is detected from a nearby ground surface 9a through a connection pile 52 by a guide antenna 53. However, it guide | induces with the boring machine 48, it excavates to the arrival pile 54, and the drilling track | orbit 55 is formed. The boring machine 48 is operated by a hydraulic unit (not shown).

  The guiding system for the boring head 51 guides the head position by the magnetic coupling between the oscillation coil mounted on the boring head 51 and the two receiving coils in the antenna arranged at the arrival point. Vertical / front / rear position sensing is promoted by integrating the output of the vertical angle sensor mounted on the boring head. The current position is calculated at predetermined intervals in the front-rear direction and displayed on the screen in real time. The operator may operate the operation box while looking at this screen so that the boring head advances along the preset target course.

  Next, as shown in FIG. 20, after the drilling track 55 reaches the reaching pile 54, a back reamer 56 (FIG. 21) as a hole expanding device is connected to the boring head 51, and a swivel 57 is connected to the reamer 56. Through the expander chuck 58, the flexible bundling injection tube 14 on the nearby ground surface 9a is sandwiched and connected. Subsequently, the back reamer 56 is rotated to expand the drilling trajectory into the boring hole 11, and then the flexible bundling injection pipe 14 is drawn into a predetermined location while the drilling fluid is jetted into the boring hole 11, Buried. The drilling fluid used here is bentonite mud, water, or a curable sealing material such as cement bentonite mud, but usually bentonite mud or water is used for drilling and curable when the injection pipe 14 is retracted. A sealing material is used.

  FIG. 22 is an explanatory view showing a specific example of the ground injection method according to the present invention. FIG. 20 relates to the ground improvement of the ground 10a to be improved, such as a building, apartment house, waste disposal site, reservoir, reservoir, etc., such as below the inanimate body 42 that cannot be moved, that is, the ground 10a to be improved. First, the ground 10a to be improved of the ground 10 is bored as described above to form the boring hole 5.

  When there is an obstacle on the planned drilling locus during drilling, the sensor at the tip of the boring rod transmits a signal, and this signal is received by the ground receiver to guide the drilling in a direction to avoid the obstacle. To do. Alternatively, the position signal transmitted from the sensor at the tip of the boring rod is processed by a personal computer on the ground using a signal cable, and the drilling path is managed so as to avoid obstacles.

Next, the horizontal hole portion 11b is passed through the bore hole 11 drilled as described above through the oblique hole portion 11a or the opposite oblique hole portion 11a, and the flexible binding together with bentonite mud water in the bore hole 11. The injection tube 14 is inserted. In this insertion, the flexible binding injection tube 14 is inserted by connecting the flexible core member 44 to the drill head 45 of FIG. Bentonite mud is effective as a lubricant as well as a sealant. Further, this bentonite mud is replaced with a cement bentonite seal 30 and hardened, that is, the seal 30 is formed between the injection pipe 14 and the hole wall 31 of the boring hole 11, and then the flexible bundle injection pipe 14. An injection solution is injected from the injector 60 into the ground 10 to be improved through the discharge port 13 to improve the ground 10 to be improved. A hole protecting material such as cement bentonite or a hardener can be used instead of bentonite mud. In FIG. 22, reference numeral 61 denotes a winder for the flexible bundling injection tube 14.

  The flexible bundling injection tube 14 used in the above is made of a flexible material such as rubber and plastic. For example, as shown in FIG. 12... 12 are bunched together with a flexible core material 44 so that these discharge ports 13, 13... When the injection is performed, the injection material is injected into the ground 10 to be improved by breaking the seal 30 through the plurality of discharge ports 13, 13. To do.

  As described above, the guided horizontal boring method used in the present invention guides a boring rod that jets a drilling fluid (bentonite mud, etc.) from the starting pit while detecting it from the ground with an induction antenna, and digs the drill rod to the reaching mine. Let

  The drill head used in this construction method is as shown in FIG. More specifically, the drill head 45 shown in FIG. 17 is connected to a drilling device (not shown), and as shown in FIG. 17A, the drill head 45 is propelled while rotating in the ground. In this case, as shown in FIGS. 19 and 20, the operator operates the operation box so that the drill head advances along the target course. The direction of the drill head 45 is corrected by rotating the tip tapered blade 46 of the drill head 45 as shown in FIG. The straight portion inverts the taper blade (FIG. 17A), and press-fits the taper blade fixed in a bending direction when curved (FIG. 17B).

  Furthermore, another ground injection method according to the present invention will be described in detail with reference to FIG. First, it is bent from the ground surface 9a near the ground 10a to be improved into the ground 10, or an arbitrary combination of bending and straight lines, and an inclined hole portion 11a, a straight or horizontal boring hole 11b, an opposite inclined hole portion. The boring hole 11 is formed by boring to the near ground surface 9a on the opposite side through 11a. Next, the flexible binding tube 14 (the bag body 23 may not be provided) in which the flexible core material 44 of FIG. 16 is held in the obtained boring hole 11 is used, and the core material 44 member is not illustrated. 23, as shown in FIG. 23, the gap between the boring hole wall 31 and the flexible binding pipe 14 is filled with the same sealing material as described above, for example, drilling fluid, solidifying fluid, etc. While the seal 30 is formed, the boring tube is further pulled out and inserted into a predetermined position of the ground 10a to be improved. Thereafter, as shown in FIG. 23, the injection solution is injected from the discharge port 13 of the flexible binding injection tube 14 by breaking the seal 30 made of the sealing material. At this time, as described above, it is sufficient to insert the end portion of the flexible binding injection tube 14 up to the end portion of the ground 10a to be improved, but it may be drawn into the adjacent ground surface 9a on the opposite side.

  As shown in FIG. 16, the flexible binding injection tube 14 may be one in which one of the plurality of discharge ports 13, 13... 13 is covered with a bag packer 28. After inserting the flexible binding injection pipe 14 into a predetermined position of the ground 10a to be improved, as shown in FIG. 24, a packing material is injected into the bag packer 28 to form the packer 28, and then the flexible binding The injection solution is permeated and injected from the discharge port 13 between the adjacent packers 28 and 28 from the discharge port 13 of the injection tube 14.

  Furthermore, another ground injection method according to the present invention will be described below. First, the boring hole 11 shown in FIG. 22 is formed in the ground 10 a to be improved of the ground 10 in the same manner as described above. Next, when a sealing material similar to that described above is injected while the flexible binding injection tube is connected to the boring head and pulled into the boring hole 11, the state shown in FIGS. 22 and 23 is obtained. Referring to FIG. 23, the flexible bundling injection tube 14 is arranged at a predetermined position to be improved, and the injection material from the discharge ports 13, 13... 13 of the flexible bundling injection tube 14 is a sealing material. The seal 30 is broken and injected.

  In the present invention, the flexible injection tube is fixed to the ground by, for example, the following steps (a) to (d). These steps are specifically shown in FIGS. 18 (a) to 18 (e). This will be described in detail as follows.

  (A) A boring rod 49 fitted with a drill head 45 at its tip is inserted into the casing 50, and the casing 50 is installed in the ground 10a together with the boring rod 49 while drilling the ground 10a to be improved. That is, as shown in FIG. 18 (a), the ground 10a to be improved is drilled with a drill head at the tip of the boring rod 49, and the casing 50 and the boring rod 49 are installed together in the ground 10a to be improved.

  (B) The boring rod 49 is pulled out and only the casing 50 is installed in the ground 10a. That is, as shown in FIG. 18B, only the casing 50 is disposed in the ground 10a to be improved.

  (C) The injection pipe 14 having a plurality of discharge ports 13, 13,... 13 is inserted into a casing 50 installed in the ground 10a. This is as shown in FIG.

  (D) Only the casing 50 is pulled out from the ground 10a, and the injection tube 14 is fixed in the ground 10a. FIG. 18D shows a state where the casing 50 is pulled out, and FIG. 18E shows a state where the casing 50 has been pulled out and the injection tube 14 is fixed in the ground 10a.

  25, 26, and 27, the above-described injection tube 14 is configured by bundling a plurality of thin tubes 12, 12,... 12 having discharge ports 13 and mounting a fixing member 62 at the tip. FIG. 25 shows an example in which a foldable anchor member is used as the fixing member 62, FIG. 26 shows an example in which a weight is used as the fixing member 62, and FIG. An example using a bag body that expands by injecting a liquid is shown.

  25, 26 and 27, the bundling injection tubule 12 according to the present invention has a plurality of tubules 12, 12... 12 each having discharge ports 13, 13. For example, it is configured by being bound by a cover tube 63 made of synthetic resin. At this time, the discharge ports 13, 13... 13 of the thin tubes 12, 12... 12 are arbitrary portions in the axial direction and face the outside of the cover tube 63 to be exposed.

  The above-described bundling injection tube 14 according to the present invention is inserted into the casing 50 and pulled out of the casing 50 as will be described in detail later with reference to FIGS. 28 to 33, and fixed to the ground 10 by the fixing member 62. After the fluid is injected into the packer bag body 64 inserted and then installed at an arbitrary position of the injection tube 14 and expanded to form a backflow prevention packer 65, each of the narrow tubes 12, 12... An injection material is injected into the ground 10 through the discharge ports 13, 13. Alternatively, as shown in FIG. 34 to be described later, after the seal 30 is injected into the casing 50, the casing 50 is pulled out and the periphery of the bundle injection tube 14 is covered with the seal 30 to prevent backflow of the injected solution. In this way, the bundling injection tube 14 is inserted into the ground 10, and after fixing, the injection solution is injected into the ground 10 from the discharge ports 13, 13... 13 through the respective thin tubes 12, 12.

  More specifically, as shown in FIG. 28, after the bundling injection tube 14 shown in FIG. 25 with the anchor attached to the tip 66 as the fixing member 62 is inserted into the casing, as shown in FIG. Only the casing 50 is pulled up. At this time, when the casing 50 is pulled up while a fluid such as water, muddy water, or cement / bentonite liquid is pressed into the casing 50, the rubber seal 67 is pressed downward by the pressure of the fluid, and the binding injection pipe 14 is moved upward. To prevent movement. When the casing 50 is pulled out in this state, as shown in FIG. 29, since the binding injection pipe 14 is prevented from moving upward, only the casing 50 is pulled out, the anchor jumps out of the casing 50 and opens, and is fixed. Acts as a member 62.

  It is also possible to drop the binding injection pipe 14 into the casing 50 while pressing a fluid into at least one of the binding injection pipes 14 and pull out the casing 50 to fix the binding injection pipe 14 in the ground 10.

  Thus, after pulling out only the casing 50 and fixing the bundling injection tube 14 in the ground 10 by the fixing member 62, as shown in FIG. 30, the packer mounted at an arbitrary position of the bundling injection tube 14 is used. A fluid is introduced into the bag body 64 and expanded to form a backflow preventing packer 65. Thereafter, as shown in FIG. 31, the injection material is injected into the ground 10 from the discharge port 13 through the thin tube 12, and the ground 10 is solidified by the injected liquid as indicated by the oblique lines in FIGS. 31 and 32. A knot 68 is formed.

The packer 65 may be omitted depending on circumstances. When the hole in the hole is broken and the bundling injection pipe is filled with earth and sand as the casing is pulled out, it may be injected as it is from each discharge port of the bundling injection pipe. Alternatively, the seal may be injected into the casing before the binding injection pipe is inserted into the casing, and then the binding injection pipe may be inserted, and the casing injection pipe may be fixed by the fixing member, and only the casing may be pulled out. The seal may be injected while inserting the bundling injection tube into the casing, or it may be injected into the casing after insertion of the bundling injection tube. Of course, as shown in FIG. 30, both the packer 65 and the seal 30 can be used.

In the above-described fixing method of the bundling injection pipe to the ground, after injecting the seal 30 into the casing 50, the bundling injection pipe 14 with the fixing member 62 attached to the tip is inserted into the casing 50,
Only the casing 50 may be pulled out to fix the bundling injection tube 14 to the ground 10,
After the bundling injection pipe is inserted into the casing 50, only the casing 50 may be pulled out while injecting the seal 30 therein to fix the bundling injection pipe 14 in the ground 10.

  The above-described seal 30 surrounds the bundling injection tube 14 as shown in FIG. 30, and the injection material is injected into the ground 10 as shown in FIG. 31 and FIG. A knot 68 is formed.

When the one shown in FIG. 25 is used as the binding injection tube 14, before the casing 50 is pulled out,
The anchor as the fixing member 62 is folded in the casing 50, but after the casing 50 is pulled out, the anchor is opened and acts as the fixing member 62. As shown in FIG. 32, the bundling injection tube 14 may be pulled up while leaving only the anchor 62 in the ground 10, or may be terminated and buried in the state of FIG.

  26 is used as the binding injection pipe 14, the weight as the fixing member 62 is in the casing 50 before the casing 50 is pulled out. However, after the casing 50 is pulled out, the weight 62 is grounded. 10 exhibits an action as the fixing member 62. The bundling injection tube 14 is not shown in the figure, but as in FIG. 32, only the weight may be left in the ground and pulled up, or may be terminated and buried in the same state as in FIG.

  When the one shown in FIG. 27 is used as the bundling injection pipe 14, before the casing 50 is pulled out, the bag body as the fixing member 62 is in a contracted state because no fluid is pressed into it. When pulling out, a fluid is press-fitted into the bag body and expands to exhibit an action as the fixing member 62 in the ground 10. After the injection solution is injected from the discharge ports 13, 13,... 13 of the binding injection tube 14, the binding injection tube 14 may be buried or may be pulled out as shown in FIG. The bundling injection tube 14 is difficult to pull out when the fluid in the bag body 64 is a caking fluid. However, if the seam portion above the packer 65 is formed weakly, the bundling injection tube at this portion can be pulled out. it can. When the fluid in the bag body is a non-consolidating fluid, the binding injection pipe 14 may be pulled up together with the bag body in a state where the press-fitting of the fluid is stopped and the bag body is contracted. In this case, the process may be terminated in the same state as in FIG. 31, and the bundling injection pipe 14 may be buried in the ground.

  Boreholes of arbitrary shape are drilled at the place to be improved in the ground, and the injection solution is simultaneously injected into the ground through the multiple discharge ports from this borehole, so it is unspecified in the horizontal direction. Despite injecting from a horizontal injection tube that is easy to diffuse and penetrate, it is possible to infiltrate and consolidate into a predetermined infiltration solidification form at a predetermined position, and under the existing structure that is difficult to perform ground injection It is an industrially useful invention that can quickly and reliably perform ground improvement over a wide area.

It is explanatory drawing showing the basic structure for demonstrating the ground injection construction method concerning this invention. It is explanatory drawing for implementing this invention injection construction method using an injection liquid feeding apparatus. It is explanatory drawing for implementing this invention injection construction method using another injection liquid sending apparatus. It is explanatory drawing of the state which inserted the flexible binding injection pipe | tube in the several boring hole using the apparatus of FIG. FIG. 5 is an explanatory diagram showing a state of injection and consolidation in FIG. 4. Furthermore, it is explanatory drawing for implementing this invention injection construction method using another injection solution sending apparatus. It is explanatory drawing of the other injection construction method using the injection liquid sending apparatus of FIG. It is a front view of one specific example of the multi-continuous pump which operates many unit pumps with one drive source. It is a longitudinal cross-sectional view of the example of ground injection below the structure. It is a top view of the example of ground injection below a structure. It is explanatory drawing showing the binding injection pipe concerning this invention using a bag packer. It is explanatory drawing of the state which filled the seal | sticker in the boring hole. It is explanatory drawing of the state which inserted the bundling injection tube with which the bag packer was adhered in the boring hole, and also filled the seal | sticker. It is a schematic diagram of one specific example for demonstrating the principle of this invention method. It is a schematic diagram of the other specific example for demonstrating the principle of this invention method. It is a partial top view of one specific example of the flexible binding injection pipe used for the present invention. It is a top view of one specific example of the drill rod used for this invention, Comprising: The state of linear advance propulsion is shown, rotating. It is a top view of one specific example of the drill rod used for this invention, Comprising: The state of curvilinear propulsion is shown. The boring state below the structure. The boring rod is pulled out and only the casing is installed in the ground. A state in which a flexible binding injection tube is inserted into the casing. A state where a packer is formed. The casing is pulled out and the injection solution is injected into the ground through the flexible bundling injection tube. It is explanatory drawing of an example which drills the drilling track | orbit at the time of drilling a boring hole on-site. It is explanatory drawing of an example which expands and forms a boring hole after forming a drilling track | orbit on the spot. It is a perspective view of one specific example of the hole expanding apparatus used when expanding and forming a boring hole. It is sectional drawing of one specific example for demonstrating the method of this invention. It is a fragmentary sectional view showing one injection mode of the method of the present invention. It is a fragmentary sectional view showing one injection mode of the method of the present invention using a packer. It is a side view of a flexible binding injection tube using a foldable anchor as a fixing member. It is a side view of a flexible binding injection tube using a weight as a fixing member. It is a side view of the flexible binding injection pipe using the bag body which expand | swells by injection | pouring of a fluid as a fixing member. FIG. 26 is a cross-sectional view of the casing when the flexible bundling injection tube of FIG. 25 with the anchor attached to the tip as a fixing member is dropped into the casing. It is sectional drawing of the state which pulled up the casing of FIG. 28 and protruded the anchor. It is sectional drawing of the state which pulled up the casing of FIG. 28, filled the seal grout into the hole, and expanded the packer bag to form the packer. It is sectional drawing of the state which inject | poured injection liquid in the ground from the discharge outlet and formed the solidified body in the ground. FIG. 31 is a cross-sectional view of the state in which the flexible binding injection tube is pulled out after only the injection solution is injected in FIG. A partial cross-sectional view showing the use state of an actual flexible binding injection tube, in which a plurality of packers are formed at intervals in a flexible binding injection tube, and an injection solution is injected into the ground from a gap between the packers. is there. It is sectional drawing showing the fixing state when an anchor is used as a fixing member. It is sectional drawing showing the fixing state when using an anchor as a fixing member and fixing with a seal | sticker.

Explanation of symbols

A Infusion Solution Delivery Device 1 Infusion Solution Tank 2 Infusion Solution 4 Pump 5 Conduit 6 Flow Meter 7 Pressure Gauge 8 Control Unit 9 Ground Surface 10 Ground 11 Boring Hole 12 Flexible Injection Capillary 13 Discharge Port 14 Flexible Bundling Injection Tube DESCRIPTION OF SYMBOLS 15 Injection liquid pressurization part 16 Injection liquid distribution part 17 Injection part 18 Liquid supply system 20 Branch pipe 20a Liquid supply pipe 21 Connection part 22 Distribution container 24 Unit pump 25 Drive source 26 Rotational speed transmission 27 Binding band 27a Fixing plate 28 Bag Packer 29 Structure 30 Seal 31 Hole wall 32 Multiple continuous pump 33 Rotating shaft 34 Cam 35 Tappet 36 Motor 42 Inanimate body 43 Consolidation area 44 Flexible core material 45 Drill head 46 Tip taper blade 48 Boring machine 49 Boring rod 50 Casing 51 Boring head 60 Injection machine 61 Winding machine 62 Fixing member 66 Tip End 68 Solidified body 69 Drilling hole 70 Clearance

Claims (24)

  A boring hole having an arbitrary shape is drilled in a place to be improved on the ground, and a flexible injection tube having a plurality of discharge ports is inserted into the boring hole, and an injection solution is supplied through the discharge ports, and an injection solution feeding device. A ground injection method characterized in that the ground is solidified by simultaneously injecting into the ground through any number of discharge ports.   The injection solution is injected from the injection solution pressurizing unit through a plurality of injection solution delivery systems to the injection point in the ground, and the plurality of injection solution delivery systems are provided with flow rate pressure detectors, which are detected by these detectors. The flow rate and / or pressure data of the injected liquid is transmitted to a centralized control device equipped with an injection monitoring panel, and the injection status from the injection liquid feeding system is displayed on the screen of the injection monitoring panel, and the batch monitoring is performed. A ground injection method characterized by managing the injection of each infusion system.   2. The flexible bundling injection tube according to claim 1, wherein the flexible injection tube having a plurality of discharge ports is formed by bundling a plurality of flexible injection capillaries so that these discharge ports are positioned at different positions in the axial direction. The ground injection construction method according to claim 1.   Flexible boring holes of arbitrary shape are drilled in the ground to be improved, and a plurality of flexible injection capillaries are bundled in the boring holes so that these discharge ports are located at different axial positions. A solid binding injection tube is inserted, and the injection solution is injected through each of these discharge ports into the ground through any of a plurality of discharge ports simultaneously to consolidate the ground. The liquid delivery device has an injection liquid pressurizing section and a plurality of branch pipes that communicate with the plurality of flexible injection capillaries, and an injection liquid distribution that distributes the pressure injection liquid from the pressurization section to each branch pipe A liquid supply system for the pressurized injection liquid that leads from the injection liquid pressurizing section to the injection liquid distribution section, and a liquid flow meter and / or a liquid pressure gauge provided in the liquid supply system, Pressurizing the injected liquid based on information from the liquid flow meter and / or liquid pressure gauge , And simultaneously injects and injects the injection liquid from a single liquid supply system to a plurality of injection capillaries at a predetermined flow rate or pressure of the pressurized injection liquid, thereby rapidly and reliably improving a wide range of ground. This is a ground injection method.   5. The injection liquid distribution unit according to claim 4, further comprising a distribution container, wherein a plurality of branch pipes are extended from the distribution container, and the pressure injection liquid from the pressurization unit passes through a liquid feeding system and then the distribution container. The ground injecting method according to claim 4, which is distributed to each branch pipe.   Flexible boring holes of arbitrary shape are drilled in the ground to be improved, and a plurality of flexible injection capillaries are bundled in the boring holes so that these discharge ports are located at different axial positions. A solid binding injection tube is inserted, and the injection solution is injected through each of these discharge ports, and the ground is consolidated by simultaneously injecting the injection solution from the injection solution feeding device into the ground through a plurality of discharge ports. The liquid feeding device is provided with a large number of infusion liquid tanks and one plant, and each unit pump is connected to the infusion liquid tank and is operated by an independent drive source and controlled by a control unit. A multi-injection device connected to a unit pump and having the other connected to a plurality of narrow tubes of the boring holes and a conduit respectively connected to the unit pump, and the rotation controlled by the control unit to each of the independent unit pumps A transmission and a flow rate pressure detector in the conduit, whereby a flow rate and / or pressure data signal from the flow rate pressure detector is transmitted to the control unit, and the infusion solution in the infusion solution tank The ground injection method is characterized in that each unit pump is pumped to each injection capillary at an arbitrary injection speed, injection pressure or injection volume, and multiple points are simultaneously injected into the ground from a plurality of discharge ports.   Flexible boring holes of arbitrary shape are drilled in the ground to be improved, and a plurality of flexible injection capillaries are bundled in the boring holes so that these discharge ports are located at different axial positions. A solid binding injection tube is inserted, and the injection solution is injected through each of these discharge ports, and the ground is consolidated by simultaneously injecting the injection solution from the injection solution feeding device into the ground through a plurality of discharge ports. The liquid feeding device includes an injection liquid tank, a multi-unit pump including a large number of unit pumps in one plant, and a liquid transmission pipe leading to the flexible bundling injection pipe in the ground. Connected to each unit pump of the pump, each unit pump is connected to each of a plurality of liquid feeding pipes, the multi-continuous pump is a rotating shaft driven by one driving source, and an arbitrary shape fixed to the rotating shaft With numerous cams These cams are connected via tappets and have a large number of unit pumps that operate according to their respective cam drive systems. The cams are driven by the rotation of the rotating shaft to operate the unit pumps, and the injected liquid can be discharged arbitrarily. A ground injection method characterized by sucking from the suction port at a speed and discharging it to the discharge port.   8. The ground injection according to claim 3, 4, 6, or 7, wherein the arbitrarily shaped boring hole is bent obliquely downward from the ground surface or further formed in a horizontal direction. Construction method.   8. The flexible binding injection tube according to claim 3, 4, 6 or 7, wherein the flexible binding injection tube is bound by binding a flexible core material to a plurality of flexible injection capillaries. Ground injection method.   The ground according to claim 3, 4, 6, or 7, wherein a bag packer is covered on any of the plurality of discharge ports of the flexible binding injection pipe. Injection method.   8. The method according to claim 3, 4, 6 or 7, wherein a seal is formed in a gap between the flexible bundling injection tube and a borehole wall, and an injection solution is injected into the ground through each discharge port by breaking the seal. Item 8. The ground injection method according to Item 3, 4, 6 or 7.   The ground injection method according to claim 3, 4, 6, or 7, wherein the boring is performed by guiding a boring head in the ground in a predetermined direction from the ground part by a guidance system.   8. The flexible bundling injection tube in which a flexible core material is held in the boring hole is connected to the head of the boring tube and a sealing material is filled in the boring hole. While further pulling out the boring tube and inserting it into a predetermined position of the ground to be improved, the injection material is injected from the discharge port of the flexible bundling tube while breaking the seal by the sealing material. The ground injection method according to 3, 4, 6 or 7. The ground injection method according to claim 13, wherein the sealing material is a drilling fluid or a solidifying fluid.   The flexible binding tube according to claim 13, wherein the flexible binding tube is configured by covering a bag packer on any of the plurality of discharge ports, and the flexible binding tube is inserted into a predetermined position on the ground to be improved. The ground injection method according to claim 13, wherein a packing material is injected into the bag packer to form a packer, and then the injection material is injected from the discharge port of the flexible binding injection tube. Boring holes of arbitrary shape can be drilled in the ground to be improved, flexible injection pipes can be inserted into the boreholes, and injection solution can be injected into the ground through these discharge ports to solidify the ground. A method for fixing a flexible injection tube, wherein the flexible injection tube is fixed in the ground by the following steps (a) to (d).
(A) A boring rod with a drill head attached to the tip is inserted into the casing, and the casing is installed in the ground together with the boring rod while drilling the ground.
(B) Pull out the boring rod and install only the casing in the ground.
(C) An injection tube having a plurality of discharge ports is inserted into a casing installed in the ground.
(D) Pull out only the casing from the ground and fix the injection tube in the ground.   17. The fixing method according to claim 16, wherein the injection tube is an injection tube configured by mounting a fixing member at a tip thereof.   18. The fixing method according to claim 17, wherein the fixing member is an anchor member, and only the casing is pulled out and the anchor is fixed at a position in the ground as it is.   18. The fixing method according to claim 17, wherein the fixing member is a weight, and the weight is fixed at a position in the ground by pulling out only the casing.   18. The fixing member according to claim 17, wherein the fixing member is a bag body that expands by injecting a fluid, and only the casing is pulled out, and the fluid is press-fitted into the bag body to be expanded, and the expanded bag body is fixed at a position in the ground. The fixing method according to claim 17.   17. The fixing method according to claim 16, wherein the injection tube is a flexible bundling injection tube obtained by bundling a plurality of thin tubes having discharge ports.   17. The fixing method according to claim 16, wherein the seal grout is injected into the casing, and the injection pipe is covered with the seal grout and fixed in the ground.   18. The fixing method according to claim 17, wherein the bundling injection tube is inserted into the casing, and the casing is pulled out while fluid is pressed into at least one of the bundling injection tubes to fix the bundling injection tube in the ground.     18. The packer bag body that expands by injecting fluid is attached to an arbitrary portion of the injection tube, and prior to the injection of the injection material, the fluid is injected into the bag body and expanded to inject the injection tube and the hole. The fixing method according to claim 16, wherein a packer is formed between the walls.

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