JP3755472B2 - Ground improvement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground improvement method such as a soft ground, a leaky ground, a ground that may be liquefied, and a contaminated ground, and more particularly, a supporting ground below an existing structure that is difficult to improve the ground, and a bottom of a waste disposal site. Or, it relates to a method for improving the reservoir basin or reservoir reservoir, etc., and more specifically, the supporting ground below the existing structure, which is difficult to improve the ground, can be improved efficiently and economically. The present invention relates to a ground improvement method that can prevent liquefaction of wastewater, prevent elution of harmful substances from a waste disposal site, and further prevent leakage from a reservoir or reservoir.
[0002]
[Prior art]
For soft ground, such as ground subsidence due to earthquakes or ground that may be liquefied, as a countermeasure, cement-based solidification materials and other materials such as structures, waste disposal sites, reservoirs and reservoirs should be constructed. Various ground improvements such as injection of chemicals into the ground have been made. Such ground improvement is necessary not only when constructing a new inanimate object, but also for the existing inanimate object, it is necessary to improve the ground on the supporting ground.
[0003]
Conventionally, for example, as shown in FIG. 15, a vertical hole 101 or an oblique hole 102 is drilled in the ground 100 near the structure 106 as an inanimate body, and then into the holes 101, 102. A means for embedding an injection pipe 105 and injecting a chemical solution into the ground 100 through the injection pipe 105 was adopted.
[0004]
[Problems to be Solved by the Invention]
However, in this case, when the structure 106 is very large, or in the case of a waste treatment plant, a reservoir, a water purification plant, etc., not only the vertical drilling hole 101 but also the region that cannot be improved even if the oblique hole 102 is injected. As a result, a large amount of 103 remains, and there are few consolidated regions 104. Therefore, not only a sufficient improvement effect is not expected, but also the number of drilling holes becomes large, which is uneconomical.
[0005]
By the way, Japan is said to be one of the world's leading volcanic areas and has been hit by numerous disasters. For this reason, it has been urgently required to improve and improve earthquake-resistant lifelines, and lifelines that are resistant to disasters have been demanded. Therefore, in various mainline maintenance projects, it is necessary to solve various problems and problems such as consideration for the natural environment, response to roads and traffic regulations, vibrations associated with construction, and countermeasures against noise.
[0006]
For example, important structures such as oil tanks and various factories are required to improve the ground by injecting chemicals to prevent liquefaction during an earthquake. In addition, many reservoirs, reservoirs, waste disposal sites, etc. have passed many years after construction, and in recent years, aging has progressed and repair work such as prevention of water leakage due to chemical injection is required.
[0007]
Therefore, the object of the present invention is to improve the efficiency of an existing structure such as a building, a waste disposal site, a reservoir, a reservoir, etc., which is difficult and difficult to improve the ground, efficiently and economically. An object of the present invention is to provide a ground improvement method which can be carried out without being restricted by the conditions and which eliminates the disadvantages existing in the above-mentioned known technology.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, according to the present invention, boring is performed from the ground surface near the ground to be improved, and a flexible injection capillary is inserted into the obtained drilling hole and injected into the ground through the injection capillary. In the ground improvement method for improving the ground by injecting material, the boring hole is obtained by bending into the ground from the ground surface near the ground or by arbitrarily combining bending and straight lines, and The flexible injection tubule is a flexible bundling injection tubule, and is formed by bundling a plurality of flexible injection tubules so that their discharge ports are located at different locations in the axial direction. The injection material is injected into the ground to be improved through these discharge ports.
[0009]
Furthermore, in order to achieve the above-mentioned object, according to the present invention, it is bent into the ground from the near ground surface of the ground to be improved, or by boring to the near ground surface on the opposite side by arbitrarily combining the bending and the straight line, After that, while holding the flexible bundling tubule with the flexible core material held in the boring hole, hooking the core material part to the head of the boring rod and filling the sealing material, while pulling out the boring rod The injection material is inserted into a predetermined position of the ground to be pulled in and improved, and the injection material is injected from the discharge port of the flexible bundling capillary tube while breaking the seal by the seal material.
[0010]
Still further, in order to achieve the above-mentioned object, according to the present invention, the boring to the near ground surface on the opposite side is performed by bending the ground surface near the ground to be improved into the ground or by arbitrarily combining bending and straight lines. Next, after connecting the flexible sheath or tube containing the flexible bundling capillaries to the boring head and drawing it into the boring hole, pull out only the sheath tube while introducing the sealing material into the boring hole. The flexible bundling injection tubule is arranged at a predetermined position to be improved, and the injection material is injected from the discharge port of the flexible bundling injection tubule by breaking the seal by the sealing material.
[0011]
Further, in order to achieve the above-described object, according to the present invention, the ground surface to be improved is bent into the ground surface, or any combination of bending and straight lines is drilled to the near ground surface on the opposite side. Then, after connecting the flexible sheath having a plurality of discharge ports on the peripheral wall to the boring head and introducing the sealing material between the sheath tube and the bore hole, the sheath tube is embedded in the bore hole. In the sheath tube, the flexible bundling tubule whose discharge port is covered with a plurality of bag packers is inserted so that the discharge port of the sheath tube is located between adjacent bag packers of the flexible bundling tube, After the bag packer is expanded to form a packer, the injection material is injected through the discharge port of the flexible bundling injection capillary tube.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 is a schematic diagram of a specific example for explaining the principle of the method of the present invention. FIG. 2 is a schematic view of another specific example for explaining the principle of the method of the present invention. FIG. 3 is a partial plan view of a specific example of the flexible bundling injection tubule used in the present invention. 4A and 4B are plan views of a specific example of the drill rod used in the present invention, in which FIG. 4A shows a state of straight propulsion while rotating, and FIG. 4B shows a state of curvilinear propulsion. FIG. 5 is an explanatory view of concrete boring in the field according to the present invention, where (a) is boring by a boring head, (b) is insertion of a casing, (c) is injection of a flexible bundling injection capillary, (D) shows formation of a packer, and (e) shows injection of an injection material. FIG. 6 is an explanatory diagram of an example of drilling a drilling track when drilling a boring hole on site. FIG. 7 is an explanatory diagram of an example in which a drilling track is formed on site and then expanded to form a borehole. FIG. 8 is a perspective view of a specific example of a hole expanding device used for expanding a hole to form a boring hole. FIG. 9 is a cross-sectional view of one specific example for explaining the method of the present invention. FIG. 10 is a partial sectional view showing one injection mode of the method of the present invention. FIG. 11 is a partial sectional view showing an injection mode of the method of the present invention using a packer. FIG. 12 is a partial cross-sectional view showing the flexibility and the state of use of the tube used in the present invention. FIG. 13 is a partial cross-sectional view showing an injection mode when using a flexible bundling injection capillary tube and a sheath tube to which a packer is attached. FIG. 14 is a partial cross-sectional view showing an injection mode when a flexible bundle injection capillary tube with a packer and a sheath tube with a packer are used. FIG. 15 is a schematic diagram showing a known ground improvement of the support ground directly under the structure.
[0014]
FIG. 1 is a basic schematic diagram of the method of the present invention. From a ground surface 3 to a ground 4 near a ground 2 to be improved directly under a non-movable inanimate body 1, such as a building, a waste disposal site, a reservoir, a reservoir, etc. Bending in or a combination of bending and straight lines, for example, in FIG. 1, first bent diagonally first, then straight to the ground 2 to be improved directly below the inanimate body 1, and then further diagonally And boring to the near ground surface 3 on the opposite side to form a boring hole 5.
[0015]
Next, flexible bundling injection capillaries 6 are inserted into the boring holes 5 in FIG. 1, the injection material is discharged from these discharge ports, injected into the ground 4, and fixed to the ground 2 to be improved immediately below the inanimate body 1. A tie region 7 is formed.
[0016]
FIG. 2 is another basic schematic view according to the present invention, which is an example in which the conventional vertical drilling hole 101 and the oblique straight-lined diagonal hole 102 and the curved (bent) boring hole 5 are used in combination. . In this method, since the boring hole 5 of the present invention is used in combination with the conventional technique, the ground 2 to be improved is consolidated more reliably and quickly, and the consolidated region 7 is formed.
[0017]
FIG. 3 is a plan view of a specific example of the flexible bundling injection tubule 6 used in the present invention, and a plurality of flexible injection tubules 8, 8,. -It is configured by binding with a band 16 so that 9 is located at different locations in the axial direction. In addition, as shown in FIG. 3, the flexible bundling injection capillary 6 can be combined with a plurality of flexible injection capillaries 8, 8,. The bag packer 11 may be covered on any one of the discharge ports 9, 9. The state in which the bag packer 11 is expanded to form a packer will be described later. In addition, although not shown, the flexible bundling injection thin tube 6 may be provided with a spacer in order to maintain an arbitrary interval with the hole wall of the boring hole 5.
[0018]
As this type of flexible core material 10, it is sufficient that the flexible bundling injection capillary 6 is pulled into the boring hole 5 and has sufficient strength and flexibility not to be pulled. Alternatively, it is wire-shaped, and any material such as synthetic resin or metal may be used. The flexible core material 10 is not necessarily required if one or more of the plurality of flexible injection capillaries 8 have a tensile strength sufficient to replace the core material.
[0019]
In the present invention, boring is performed substantially horizontally below the ground 2 to be improved using a guided horizontal boring method described later. That is, first, in FIG. 1 and FIG. 2, a boring rod having a drill head 17 shown in FIG. 4 (a) described later is pushed in from the ground surface 3 near the ground 2 to be improved below the inanimate body 1 while rotating. Drilling in a slanting straight line by rotating and pushing the rod.
[0020]
Next, the bit inclined surface at the tip of the drill head 17, that is, the tip taper blade 18 is adjusted in the 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 ground surface 3 on the opposite side of the inanimate body 1.
[0021]
The actual drilling using the drill head 17 of FIG. 4 will be described with reference to FIG. First, as shown in FIG. 5 (a), a start pit 35 is formed on the nearby ground surface 3, and a boring machine 28 is installed. Next, the ground 2 to be improved while rotating the drill head 17 from the boring machine 28 on the nearby ground surface 3 through the starting pit 35 and rotating the drill head 17 with the drill head 17 shown in FIG. Push in and drill. When the hole is bent, as shown in FIG. 4B, the hole is adjusted by adjusting the tip tapered blade 18 in the bending direction. This drilling may be performed until reaching the near ground surface 3 on the opposite side, but as shown in FIG. 5, it is sufficient to perform only to the end of the ground 2 to be improved.
[0022]
Subsequently, the boring rod 37 is pulled out while ejecting curable mud such as bentonite mud or cement bentonite into the drilling hole, and then rebored using the casing 36 as shown in FIG. To do. At this time, the hole drilling is protected by the casing 36.
[0023]
Subsequently, as shown in FIG. 5 (c), the flexible binding injection capillary 6 is inserted into the casing 36. The injection capillaries 6 cover the bag packers 11 and 11 at the tip, that is, the discharge port 9 located in the back of the ground 2 to be improved and the discharge port 9 located in front. When these bag packers 11 and 11 are expanded, they become packers 24 and 24 as shown in FIG. 5 (d), and the casing 36 is pulled out and injected between the packers 24 and 24 as shown in FIG. 5 (e). The material is injected from the discharge ports 9, 9... 9 to efficiently improve the ground 2 to be improved.
[0024]
Next, ground boring at another site will be described. First, as shown in FIG. 6, a boring head 26 for jetting a drilling fluid is detected from a nearby ground surface 3 through a connection pit 31 and detected by an induction antenna 27. However, it guides with the boring machine 28, digs up to the arrival pit 29, and forms the drilling track 30. The boring machine 28 is operated by a hydraulic unit (not shown).
[0025]
The induction system of the boring head 26 induces the head position to be propelled by magnetic coupling of an oscillation coil mounted on the boring head 26 and 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.
[0026]
Next, as shown in FIG. 7, after the drilling track 30 reaches the access hole 29, a back reamer 32 (FIG. 8) as a hole expanding device is connected to the boring head 26, and a swivel 33 is connected to the reamer 32. Then, the expander chuck 34 is connected with the flexible bundling injection tubule 6 on the ground surface 3 in between. At this time, the flexible binding injection capillary 6 may be inserted into the sheath tube 20 as shown in FIG. 13, and in this case, the capillary 6 and the sheath tube 20 are sandwiched between the expander chucks 34. Subsequently, the back reamer 32 is rotated to expand the drilling trajectory to form the borehole 5, and then the flexible injection capillary 6 is drawn into a predetermined location while jetting the drilling fluid into the borehole 5 and buried. To do. The drilling fluid used here is bentonite mud, water, or a curable sealant such as cement bentonite mud, but usually bentonite mud or water is used when drilling, and a curable seal is used when the narrow tube 6 is retracted. A material is used.
[0027]
FIG. 9 is an explanatory view showing a specific example of the ground improvement method according to the present invention. Fig. 8 is related to the ground improvement of the ground 2 to be improved, such as buildings, apartment houses, waste disposal sites, reservoirs, reservoirs, etc. First, the ground 2 to be improved of the ground 4 is bored as described above to form the bore hole 5.
[0028]
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.
[0029]
Next, the horizontal hole portion 5b is passed through the bore hole 5 drilled as described above through the oblique hole portion 5a or the opposite oblique hole portion 5a, and the flexible binding together with bentonite mud water in the bore hole 5. The injection capillary 6 is inserted. In this insertion, the flexible bundling injection tubule 6 is inserted by connecting the flexible core member 10 to the drill head 17 shown in FIG. Bentonite mud is effective as a lubricant as well as a sealant. Further, this bentonite mud is replaced with a cement bentonite seal 12 and hardened, that is, a seal 12 is formed between the injection pipe 6 and the hole wall 13 of the boring hole 5. An injection material is injected from the injector 14 into the ground 2 to be improved through the discharge port 9, and the ground 2 to be improved is improved. A hole protecting material such as cement bentonite or a hardener can be used instead of bentonite mud. In FIG. 9, reference numeral 15 denotes a winder for the flexible bundling injection thin tube 6.
[0030]
The flexible bundling injection tubule 6 used in the above is made of a flexible material such as rubber and plastic. For example, as shown in FIG. 10, a plurality of rubber flexible injection tubules 8, 8. 8 is formed by tying the flexible core material 10 together with a band 16 so that the discharge ports 9, 9... 9 are located at different positions in the axial direction. In injection, the injection material is injected into the ground 2 to be improved by breaking the seal 12 through the discharge ports 9, 9,... 9 of these thin tubes 8, 8,. .
[0031]
As described above, the guided horizontal boring method used in the present invention guides a boring rod that jets drilling fluid (bentonite mud etc.) from the starting pit while detecting it from the ground with an induction antenna, and drills the drill rod up to the reaching mine. Advance.
[0032]
The drill head used in this construction method is as shown in FIG. More specifically, the drill head 17 of FIG. 4 is connected to a drilling device (not shown), and as shown in FIG. In this case, as shown in FIGS. 6 and 7, the operator operates the operation box so that the drill head advances along the target course. The direction of the drill head 17 is corrected by rotating the tip tapered blade 18 of the drill head 17 as shown in FIG. The straight line portion reverses the taper blade (FIG. 4 (a)), and press-fits with the taper fixed in the bending direction when curved (FIG. 4 (b)).
[0033]
Furthermore, the other ground improvement method concerning this invention is explained in full detail using FIG. First, it is bent from the ground surface 3 near the ground 2 to be improved into the ground 4 or an arbitrary combination of bending and straight lines, and an inclined hole portion 5a, a straight or horizontal boring hole 5b, an opposite inclined hole portion. A boring hole 5 is formed by boring to the near ground surface 3 on the opposite side through 5a. Next, the flexible bundling tubule 6 in which the flexible core material 10 of FIG. 3 is held in the obtained boring hole 5 is hooked on the head of the boring tube (not shown) and the core material 10 member is shown in FIG. As described above, a sealing material similar to the above, for example, a drilling fluid, a solidifying fluid, or the like is filled in the gap between the boring hole wall 13 and the flexible bundling capillary 6 to form the seal 12 in the boring hole. While pulling out the tube, it is inserted into a predetermined position of the ground 2 to be improved. Thereafter, as shown in FIG. 10, the injection material is injected from the discharge port 9 of the flexible bundling capillary 6 by breaking the seal 12 by the sealing material. At this time, as described above, it is sufficient to insert the end portion of the flexible bundling injection capillary 6 to the end portion of the ground 2 to be improved, but it may be drawn to the near ground surface 3 on the opposite side.
[0034]
As shown in FIG. 3, the flexible bundling tubule 6 may be one in which one of a plurality of discharge ports 9, 9... 9 is covered with a bag packer 11. After the binding capillary 6 is inserted into a predetermined position of the ground 2 to be improved, as shown in FIG. 11, a packing material is injected into the bag packer 11 to form a packer 19, and then the flexible binding injection capillary 6 The injection material is permeated and injected from the discharge port 9 between the adjacent packers 19, 19 from the discharge port 9.
[0035]
Furthermore, another ground improvement method according to the present invention will be described below. First, the boring hole 5 shown in FIG. 9 is formed in the ground 2 to be improved of the ground 4 in the same manner as described above. Next, although not shown in the drawing, after the flexible sheath or tube into which the flexible bundling tubule is inserted is connected to the boring head and the sheath tube is drawn into the boring hole 5, the same as described above in the boring hole 5. Pull out only the sheath and pipe while introducing a suitable sealing material. Since the state shown in FIGS. 9 and 10 is obtained when the sheath tube is pulled out, the flexible bundling injection thin tube 6 is arranged at a predetermined position to be improved. The injection material is injected from the discharge ports 9, 9,... 9 of the flexible bundle injection thin tube 6 by breaking the seal 12 by the seal material.
[0036]
Furthermore, another ground improvement method according to the present invention will be described below. First, the boring hole 5 shown in FIG. 9 is formed in the ground 2 to be improved of the ground 4 in the same manner as described above. Next, as shown in FIG. 12, a flexible sheath 20 having a plurality of discharge ports 22, 22... 22 in the peripheral wall 21 is connected to a boring head (not shown), and the hole wall 13 of the sheath 20 and the bore hole 5 is connected. The sheath tube 20 is embedded in the seal 12 with the sealant while introducing the same sealant as described above.
[0037]
Thereafter, as shown in FIG. 3, a flexible sheath in which any of the plurality of discharge ports 9, 9,... 9 are covered with bag packers 11, 11,. 13 is inserted so that the discharge port 22 of the sheath tube 20 is located between the bag packers 11 and 11 of FIG. 3 adjacent to each other in the flexible binding capillary 6 as shown in FIG. After the packers 11 and 11 are inflated to form the packers 19 and 19, the injection material is sealed through the discharge ports 9, 9, 9 of the flexible bundling injection thin tube 6 and further through the discharge port 22 of the sheath tube 20. The seal 12 formed by the material is broken and injected. In FIG. 13, a sheath tube 20 having a flexible bundling injection thin tube 6 already incorporated therein before being introduced into the boring hole 5 may be embedded in the boring hole 5.
[0038]
Further, as shown in FIG. 14, some of the plurality of discharge ports 22, 22... 22 of the sheath tube 20 are covered with a bag packer, and the injection material is injected into the ground. In the process, after the bag packer is expanded in advance to form packers 24, 24, 24, the injection material is grounded from the discharge port 22 of the sheath tube 20 through the space 25 formed between these adjacent packers 24, 24. Can also be injected.
[0039]
【The invention's effect】
According to the above-mentioned present invention, when improving the ground below an inanimate object that cannot be moved, such as an existing structure such as a building, a waste disposal site, a reservoir, or a reservoir, the ground to be improved Boring diagonally from the ground surface near the (supporting ground) toward the lower part of the ground, then drilling the lower part of the inanimate body almost horizontally, and inserting a flexible injection tube into the obtained bore hole, this injection By improving the ground through the pipe discharge port, it is possible to improve the ground efficiently and economically without being limited by the location conditions of the supporting ground below the inanimate body, such as existing structures that are difficult to improve. In addition, ground subsidence and liquefaction of the ground during an earthquake can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a specific example for explaining the principle of the method of the present invention.
FIG. 2 is a schematic view of another specific example for explaining the principle of the method of the present invention.
FIG. 3 is a partial plan view of a specific example of a flexible bundling injection capillary used in the present invention.
FIGS. 4A and 4B are plan views of a specific example of a drill rod used in the present invention, wherein FIG. 4A shows a state of straight propulsion while rotating, and FIG. 4B shows a state of curvilinear propulsion.
FIGS. 5A and 5B are explanatory diagrams of concrete boring in the field according to the present invention, where FIG. 5A is boring by a boring head, FIG. 5B is insertion of a casing, and FIG. , (D) shows formation of a packer, and (e) shows injection of an injection material.
FIG. 6 is an explanatory diagram of an example of drilling a drilling track when drilling a boring hole on site.
FIG. 7 is an explanatory diagram of an example of forming a drilling track after forming a drilling track on site to form a boring hole.
FIG. 8 is a perspective view of a specific example of a hole expanding device used when a hole is formed to form a boring hole.
FIG. 9 is a cross-sectional view of a specific example for explaining the method of the present invention.
FIG. 10 is a partial sectional view showing an injection mode of the method of the present invention.
FIG. 11 is a partial cross-sectional view showing an injection mode of the method of the present invention using a packer.
FIG. 12 is a partial cross-sectional view showing flexibility and a use state of a tube used in the present invention.
FIG. 13 is a partial cross-sectional view showing an injection mode when using a flexible bundling injection capillary tube and a sheath tube to which a packer is attached.
FIG. 14 is a partial cross-sectional view showing an injection mode when using a flexible bundle injection capillary tube with a packer attached and a sheath tube with a packer attached thereto.
FIG. 15 is a schematic diagram showing a known ground improvement of a supporting ground directly under a structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inanimate body 2 Ground 3 to improve Near ground surface 4 Ground 5 Boring hole 5a Oblique hole part 5b Horizontal hole part 6 Flexible binding injection | pouring thin tube 7 Consolidation area | region 8 Flexible injection | pouring thin tube 9 Discharge port
10 Flexible core
11 Bag packer
12 Seal
13 hole wall
14 Injection machine
15 Winder
16 bands
17 Drill head
18 Tapered tip
19 Packer
20 Flexible sheath
21 wall
22 Discharge port
23 Rubber sleeve
24 Packer
25 space
26 Boring head
27 induction antenna
28 Boring machine
29 Reach pit
30 Drilling track
31 Connection mine
32 Buck reamer
33 Swivel
34 Expander chuck
35 Start pit
36 Casing
37 Boring rod

Claims (12)

In the ground improvement method of boring from the ground surface near the ground to be improved, inserting a flexible injection capillary into the obtained borehole, and injecting an injection material into the ground through the injection capillary to improve the ground. The boring hole is obtained by boring into the ground from the ground surface near the ground or by arbitrarily combining bending and straight lines, and the flexible injection capillary is a flexible binding injection capillary. A plurality of flexible injection capillaries are configured so that these discharge ports are located at different locations in the axial direction, and the injection material is injected into the ground to be improved through these discharge ports. The ground improvement method characterized by this. The ground improvement method according to claim 1, wherein the flexible bundling injection capillaries are bundled by tying a flexible core material to a plurality of flexible injection capillaries. 2. The ground improvement method according to claim 1, wherein a bag packer is covered on any one of the plurality of discharge ports of the flexible binding injection capillary tube. 2. The ground according to claim 1, wherein a seal is formed in a gap between the flexible bundling injection capillary and the borehole wall, and the injection material is injected into the ground through the discharge ports by breaking the seal. Improvement method. The ground improvement method according to claim 1, wherein the boring is performed by guiding a boring head in the ground from a ground portion in a predetermined direction by a guidance system. Bending from the ground surface near the ground to be improved into the ground, or boring to the ground surface on the opposite side by any combination of bending and straight lines, and then the flexible core material was held in the borehole Place the flexible bundling injection tubule on the head of the boring tube, fill the boring hole with a sealing material, and pull out the boring tube while pulling it out to a predetermined position on the ground to be improved. A ground improvement method comprising inserting and injecting an injection material from a discharge port of a flexible bundling tubule by breaking the seal by the sealing material. The ground improvement method according to claim 6, wherein the sealing material is a drilling fluid or a solidifying fluid. In Claim 6, the flexible binding tubule is configured by covering a bag packer on any of the plurality of discharge ports, and after inserting the flexible binding tubule into a predetermined position of the ground to be improved, The ground improvement method according to claim 6, 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 capillary tube. Bending from the ground surface near the ground to be improved into the ground, or any combination of bending and straight lines, boring to the near ground surface on the opposite side, and then flexible with flexible tubules inserted inside After the sheath tube is connected to the boring head and the sheath tube is drawn into the borehole, the sheath is introduced into the borehole and only the sheath tube is pulled out to improve the flexible binding injection tube. The ground improvement method characterized by arrange | positioning and inject | pouring an injection material from the discharge port of a flexible binding injection | pouring thin tube, breaking the seal | sticker by the said sealing material. A flexible sheath that has a plurality of outlets on the peripheral wall, bent from the ground surface near the ground to be improved, bent into the ground, or any combination of bending and straight lines to the opposite ground surface. The sheath tube is embedded in the borehole while introducing a sealant between the sheath tube and the borehole, and then, in the sheath tube, any of a plurality of discharge ports Insert the flexible binding injection tubule covered with the bag packer so that the outlet of the sheath tube is located between the adjacent bag packers of the flexible binding tubule, and expand the bag packer to remove the packer. A ground improvement method comprising injecting an injection material through a discharge port of a flexible bundle injection capillary after forming. The ground improvement method according to claim 10, wherein the flexible sheath or tube in which the flexible bundling injection tubule is already built is connected to a boring head and embedded in the boring hole. In claim 10, after covering some discharge ports of the plurality of discharge ports of the sheath tube with a bag packer and injecting the injection material into the ground, the bag packer is expanded in advance to form a packer. The ground improvement method of Claim 10 which inject | pours an injection material into a ground from the discharge port of a sheath pipe | tube through the space formed between these adjacent packers.

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