JP2003261934A - Soil improvement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable efficient and economical improvement of a place hard to be soil-improved such as the part under an existing structure or the like without limitation of locational conditions. <P>SOLUTION: The ground 4 is bored from the ground surface 3a near to a ground 2 to be improved in a bent line or an arbitrary combination of a bent line and a straight line. A flexible injection fine tube bundle 6 is inserted into the obtained bored hole 5. An injection material is injected into the ground 2 to be improved through the outlet opening of the fine tube bundle. A packer may be formed by attaching a bag packer somewhere around the outlet opening. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving ground such as soft ground, leaky ground and the like, which may be liquefied, contaminated ground, etc., and more particularly, support ground below an existing structure which is difficult to improve. The present invention relates to a method for improving the bottom of a waste treatment plant or the lower part of a reservoir or a reservoir. Specifically, the ground under an existing structure, which is difficult to improve, can be improved efficiently and economically. The present invention relates to a ground improvement method that can prevent subsidence and liquefaction of the ground in the event of an earthquake, prevent leaching of harmful substances from waste treatment plants, and prevent water leakage from reservoirs and reservoirs. .

[0002]

2. Description of the Related Art In the case of ground subsidence due to an earthquake or liquefaction, such as soft ground, the structure,
Various types of ground improvement such as injecting cement-based solidifying materials and chemical materials into the ground are being carried out when constructing inanimate bodies such as waste treatment plants, reservoirs and reservoirs. Such ground improvement is, of course, necessary not only when newly constructing an inanimate object, but also for the existing inanimate object, to provide ground improvement to the supporting ground.

Conventionally, as shown in FIG. 15, for example, as shown in FIG. 15, as this type of chemical solution injection, vertical holes 101 or diagonal holes 102 are bored in the ground 100 near the structure 106 as an inanimate body, and then holes 101, A means has been adopted in which an injection pipe 105 is embedded in 102 and a chemical solution is injected into the ground 100 through the injection pipe 105.

[0004]

However, the structure 106
If the area is vast, or if it is a waste treatment plant, a reservoir, a water purification plant, etc., not only the vertical drilling holes 101, but also the diagonally drilling holes 102 will leave a large unimprovable area 103 even if injected. However, the consolidation area 104 was small, and therefore, a sufficient improvement effect could not be expected, and the number of holes to be drilled was large, which was uneconomical.

By the way, Japan is said to be one of the most volcanic regions in the world and has been hit by numerous disasters. For this reason, it has become an urgent task to develop and improve seismic-resistant lifelines, and a lifeline that is resistant to disasters is now required.
Therefore, in various main line maintenance projects, consideration for the natural environment, compliance with road and traffic regulations, vibration associated with construction,
It is necessary to solve various issues and problems such as measures against noise.

[0006] For example, important structures such as oil tanks and various factories are required to improve the ground by injecting a chemical liquid as a measure against liquefaction during an earthquake. In addition, reservoirs, reservoirs,
Many waste treatment plants have been built for many years, and in recent years they have become more sophisticated and require repair work such as water leakage prevention by chemical injection.

Therefore, an object of the present invention is to efficiently improve the ground of a supporting ground, such as an existing structure such as a building, a waste treatment plant, a reservoir or a reservoir, which is difficult to be improved below,
Another object of the present invention is to provide a ground improvement method that can be implemented economically and without being restricted by site conditions, and that eliminates the drawbacks existing in the above-mentioned known techniques.

[0008]

In order to achieve the above-mentioned object, according to the present invention, boring is carried out from the ground surface near the ground to be improved into the ground, or any combination of the bending and the straight line. Insert the flexible bundled injection capillary into the obtained boring hole, and the flexible bundled injection capillary has a plurality of flexible injection capillary so that the discharge ports are located at different axial positions. It is characterized in that the injection material is injected into the ground to be improved through these discharge ports.

To further achieve the above object, according to the present invention, the ground surface near the ground to be improved is bent into the ground, or the bending and straight lines are arbitrarily combined to the ground surface on the opposite side. After boring, and then the flexible bundling thin tube in which the flexible core material is wrapped in the boring hole, hook the core material part on the head of the boring rod and fill the sealing material, and further Is pulled out and inserted into a predetermined position of the ground to be improved, and the injection material is injected from the discharge port of the flexible binding thin tube by breaking the seal formed by the sealing material.

Furthermore, in order to achieve the above-mentioned object,
According to the present invention, by bending from the ground surface near the ground to be improved into the ground, or by arbitrarily combining bending and straight lines to the adjacent ground surface on the opposite side, bowling is performed, and then the flexible bundling capillary tube is internally formed. After the stored flexible sheath is connected to the boring head and pulled into the boring hole, the sheath should be pulled out while introducing the sealing material into the boring hole. In this case, the injection material is injected from the discharge port of the flexible bundling injection thin tube by breaking the seal of the sealing material.

Further, in order to achieve the above-mentioned object,
According to the present invention, by bending into the ground from the ground surface near the ground to be improved, or by arbitrarily combining bending and straight lines to the adjacent ground surface on the opposite side, bowling is performed, and then a plurality of discharge ports are formed on the peripheral wall. After connecting the flexible sheath with the boring head and embedding the sheath in the boring hole while introducing the sealing material between the sheath and the boring hole, the sheath has a plurality of discharge ports. The flexible bundling thin tube covered with the bag packer was inserted so that the outlet of the sheath tube was located between the pouch packers adjacent to each other of the flexible bundling thin tube, and the bag pucker was inflated to form a pucker. It is characterized in that the injection material is injected later through the discharge port of the flexible binding injection capillary.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view 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 bundled injection thin tube used in the present invention. 4A and 4B are plan views of a specific example of a drill rod used in the present invention, in which FIG. 4A shows a state of straight-ahead propulsion while rotating, and FIG. 4B shows a state of curved propulsion. FIG. 5 is an explanatory view of a specific boring in the field according to the present invention, (a) is boring by a boring head, (b) is insertion of a casing, (c) is injection of a flexible binding injection thin tube, (D) shows formation of a packer, (e) shows injection | pouring of an injection material. FIG. 6 is an explanatory diagram of an example of drilling a drilling trajectory when drilling a boring hole on site. FIG. 7 is an explanatory diagram of an example of forming a boring hole by expanding the hole after forming the hole drilling track on site. FIG. 8 is a perspective view of a specific example of the hole expanding device used for forming the boring hole by expanding the hole. FIG. 9 is a sectional view of a specific example for explaining the method of the present invention. FIG. 10 is a partial cross-sectional view showing one injection mode of the method of the present invention. FIG. 11 is a partial cross-sectional view showing one injection mode of the method of the present invention using a packer. FIG. 12 is a partial cross-sectional view showing the usage state of the flexible sheath used in the present invention. FIG. 13 is a partial cross-sectional view showing an injection mode when a flexible bundled injection thin tube and a sheath tube to which a packer is attached are used. FIG. 14 is a partial cross-sectional view showing an injection mode when a flexible bundled injection thin tube having a packer and a sheath tube having a packer are used. FIG. 15 is a schematic diagram showing a publicly known ground improvement of a supporting ground immediately below a structure.

FIG. 1 is a basic schematic diagram of the method of the present invention.
A building, a waste treatment plant, a reservoir, a reservoir, etc. Bending from the ground surface 3 in the vicinity of the ground 2 to be improved directly below the immovable inanimate body 1 into the ground 4, or by combining the bending and the straight line, For example, in FIG. 1, it is first bent obliquely, then linearly on the ground 2 to be improved directly below the non-animal body 1, and then further bent obliquely and cut to the adjacent ground surface 3 on the opposite side. The boring hole 5 is formed.

Then, the flexible binding injection thin tube 6 is inserted into the boring hole 5 of FIG. 1, the injection material is discharged from these discharge ports, and the injection material is injected into the ground 4 to be improved immediately below the inanimate body 1. A consolidation region 7 is formed in 2.

FIG. 2 is also another basic schematic diagram according to the present invention, in which the conventional vertical drilling hole 101 and the oblique straight-lined oblique drilling hole 102 and the curved (bending) boring hole 5 are used together. Here is an example. In this method, since the boring hole 5 of the present invention is further used in combination with the conventional technique, the ground 2 to be improved is more reliably and quickly consolidated, and the consolidated region 7 is formed.

FIG. 3 is a plan view of a specific example of the flexible bundled injection thin tube 6 used in the present invention, in which a plurality of flexible injection thin tubes 8, 8, ... , 9 ························. Further, as shown in FIG. 3, the flexible bundling injection thin tube 6 can be tied together with a plurality of flexible bundling thin tubes 8, 8 ...
Further, the bag packer 11 may be coated on any of the plurality of discharge ports 9, 9 ,. A state in which the bag packer 11 is expanded to form a packer will be described later. Further, although not shown, the flexible bundling injection thin tube 6 may be provided with a spacer in order to keep an arbitrary distance from the hole wall of the boring hole 5.

As the flexible core material 10 of this type, it is sufficient that the flexible binding injection thin tube 6 is pulled into the boring hole 5 and has a strength and flexibility so as not to be broken by pulling. The material is in the form of string or wire, and may be made of any material such as synthetic resin and metal. The flexible core material 10 is not necessarily required as long as one or a plurality of the flexible injection thin tubes 8 has a tensile strength such that the core material can be substituted.

In the present invention, below the ground 2 to be improved,
Boring is carried out almost horizontally using the guide type 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 while rotating from the ground surface 3 near the ground 2 to be improved below the inanimate body 1, Drill a diagonal straight line by rotating and pushing the rod.

Next, the bit inclined surface at the tip of the drill head 17, that is, the tip tapered blade 18 is adjusted in the bending direction,
Drill the curved part by jetting and pushing. Then, the horizontal portion is drilled by rotating and pushing the boring rod, and further, if necessary, is drilled diagonally to the adjacent ground surface 3 on the opposite side of the inanimate object 1.

The actual drilling at the site using the drill head 17 of FIG. 4 will be described with reference to FIG.
First, as shown in FIG. 5A, a start pit 35 is formed on the nearby ground surface 3 and a boring machine 28 is installed. Then, from the boring machine 28 on the nearby ground surface 3 through the start pit 35, the boring rod 37 having the drill head 17 shown in FIG.
While rotating, push into the ground 2 to be improved and make a hole. When bending the hole, as shown in FIG. 4B, the tip taper blade 18 is adjusted in the bending direction and then drilled.
This drilling may be performed until it reaches the adjacent ground surface 3 on the opposite side, but as shown in FIG. 5, it is sufficient to drill it until the end of the ground 2 to be improved.

Subsequently, while ejecting bentonite muddy water or hardening muddy water such as cement bentonite liquid during drilling, the boring rod 37 is pulled out, and then the casing 36 is used as shown in FIG. 5 (b). And bowl again. At this time, the drilled holes are protected by the casing 36.

Then, as shown in FIG. 5C, the flexible binding injection capillary 6 is inserted into the casing 36. This injection capillary 6 is at the tip, that is, the ground 2 to be improved.
The bag packers 11 are covered with the discharge port 9 located in the back and the discharge port 9 located in the front. When these bag packers 11 and 11 are inflated, they become packers 24 and 24 as shown in FIG. 5 (d), and the casing 36 is pulled out.
As shown in (e), an injection material is injected between the packers 24, 24 from the discharge ports 9, 9, ... 9 to efficiently improve the ground 2 to be improved.

Explaining the boring of the ground at still another site, first, as shown in FIG. 6, a boring head 26 for jetting a drilling fluid is installed in the vicinity of the ground surface 3
Further, it is guided by a boring machine 28 while being detected by an induction antenna 27 through a connection pit 31 and is advanced to an arrival pit 29 to form a drilling track 30. The boring machine 28 is operated by a hydraulic unit (not shown).

The guiding system of the boring head 26 guides the head position by magnetically coupling an oscillating coil mounted on the boring head 26 and two receiving coils in an antenna arranged at a reaching point. Vertical and forward / backward position sensing is promoted by integrating the output of the vertical angle sensor mounted on the boring head. The current position is calculated at regular intervals in the front-back 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 moves along a preset target course.

Then, as shown in FIG.
After 30 reaches the reaching pit 29, a back reamer 32 (Fig. 8) which is a hole expanding device is connected to the boring head 26, and the expander chuck is connected to the reamer 32 via the swivel 33.
At 34, the flexible bundling injection thin tube 6 on the nearby ground surface 3 is sandwiched and connected. At this time, the flexible binding injection capillary tube 6 may be inserted into the sheath tube 20 as shown in FIG. 13, and in this case, the capillary tube 6 and the sheath tube 20 are sandwiched by the expander chuck 34. Subsequently, the back reamer 32 is rotated to expand the drilling track to form the boring hole 5, and then the flexible injection thin tube 6 is drawn into a predetermined position while jetting the drilling fluid into the boring hole 5 to bury it. To do. The drilling fluid used here is a hardening sealant such as bentonite muddy water, water, or cement bentonite muddy water. Usually, bentonite muddy water or water is used at the time of boring, and a hardening seal is used at the time of drawing in the thin tube 6. Wood is used.

FIG. 9 is an explanatory view showing a specific example of the ground improvement method according to the present invention. FIG. 8 shows a building ground, a housing complex, a waste treatment plant, a reservoir, a reservoir, etc. below the immovable body 1 that cannot be moved. First, the ground 2 to be improved on the ground 4 is bored as described above to form the boring hole 5.

During the drilling, if there is an obstacle on the planned drilling locus, the sensor at the tip of the boring rod sends a signal, and this signal is received by the receiver on the ground and drilled in the direction to avoid the obstacle. Guide the hole. 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 boring hole 5 drilled as described above is passed through the slant hole portion 5a or the slant hole portion 5a on the opposite side and the horizontal hole portion 5b to allow the bentonite muddy water to enter the boring hole 5. The flexible bundling injection thin tube 6 is inserted. In this insertion, the flexible binding injection thin tube 6 is inserted by connecting the flexible core material 10 to the drill head 17 of FIG. 4 (a). Bentonite muddy water not only acts as a sealant but also as a lubricant. Further, this bentonite muddy water is replaced with a cement bentonite seal 12 and hardened, that is, a seal 12 is formed in a gap between the injection pipe 6 and the hole wall 13 of the boring hole 5, and then the flexible bundling injection capillary 6 is cooled. Injecting machine 14 into the ground 2 to be improved through the discharge port 9
The injection material is injected from the ground to improve the ground 2 to be improved. A drilling protection material such as cement bentonite or a hardening material may be used instead of bentonite muddy water. In FIG. 9, 15 is a winder for the flexible binding injection thin tube 6.

The flexible bundling injection thin tube 6 used above is made of a flexible material such as rubber or plastic, and when binding, for example, as shown in FIG. , 8, ..., these discharge ports 9,
.. 9 are bundled together with a flexible core material 10 so as to be located at different axial positions, and are bound by a band 16 to be configured. And when injecting these thin tubes 8, 8 ...
The injection material is injected into the ground 2 to be improved by breaking the seal 12 through the discharge ports 9, 9, ...
Improve.

The induction type horizontal boring method used in the present invention guides the boring rod for jetting the drilling fluid (bentonite muddy water etc.) from the starting pit as described above while detecting it from the ground with the induction antenna and drilling to the reaching pit. Move the rod into the trench.

The drill head used in this method is that shown in FIG. This will be described in detail. 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. For the straight line portion, the taper blade is reversed (Fig. 4 (a)), and when curved, the taper is fixed in the bending direction and press-fitted (Fig. 4 (b)).

Further, another ground improvement method according to the present invention will be described in detail with reference to FIG. First, by bending from the ground surface 3 near the ground 2 to be improved into the ground 4, or by arbitrarily combining the bending and the straight line, the oblique hole portion 5a, the straight or horizontal boring hole 5b, and the opposite oblique hole portion. After 5a, the boring hole 5 is formed by boring up to the ground surface 3 on the opposite side. Next, the flexible bundling thin tube 6 in which the flexible core material 10 of FIG.
Hook the 10 member on the head of the boring pipe (not shown),
As shown in FIG. 10, a seal material similar to the one described above, for example, a drilling fluid or a solidifying fluid, is filled in the gap between the borehole wall 13 and the flexible binding thin tube 6 to form the seal 12 in the borehole. Meanwhile, the boring pipe is further pulled out and inserted into a predetermined position of the ground 2 to be improved. afterwards,
As shown in FIG. 10, the injection material is injected from the discharge port 9 of the flexible binding thin tube 6 by breaking the seal 12 made of the sealing material. At this time, as described above, it is sufficient to insert the end portion of the flexible binding injection thin tube 6 to the end portion of the ground 2 to be improved, but it may be pulled to the adjacent ground surface 3 on the opposite side.

As shown in FIG. 3, the flexible binding thin tube 6 may be one in which a bag packer 11 is coated on any of the plurality of discharge ports 9, 9, ... After inserting the flexible bundling thin tube 6 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 bundling is performed. The injection material is permeated and injected from the discharge port 9 of the injection thin tube 6 through the discharge port 9 between the adjacent packers 19, 19.

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, the flexible sheath with the flexible bundling capillary tube inserted therein is connected to a boring head to draw the sheath into the boring hole 5, and then, in the boring hole 5, as described above. Only the sheath tube is pulled out while introducing a new sealing material. When the sheath tube is pulled out,
Or, since it will be in the state of FIG. 10, it demonstrates below using these FIG. 9 and FIG.
Is placed at a predetermined position to be improved, and the injection material is injected from the discharge ports 9, 9, ... 9 of the flexible bundling injection thin tube 6 by breaking the seal 12 made of the sealing material.

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 outlets 22, 22, ... 22 on a peripheral wall 21 is connected to a boring head (not shown), and the sheath 20 and the bore wall 13 of the bore hole 5 are connected. The sheath tube 20 is embedded in the seal 12 made of the sealing material while introducing the same sealing material as described above between the above and the above.

After that, as shown in FIG. 3, some of the plurality of discharge ports 9, 9 ... 9 are covered with the bag packers 11, 11 ... 11 in the buried sheath 20. As shown in FIG. 13, the flexible bundling injection thin tube 6 has a discharge port for the sheath tube 20.
The bag packing of FIG. 3 in which 22 are adjacent to each other of the flexible binding thin tube 6
After inserting it so that it is located between 11, 11 and expanding the bag packers 11, 11 to form the packers 19, 19, through the discharge ports 9, 9, ... Through the discharge port 22 of the sheath tube 20, the injection material is injected by breaking the seal 12 formed by the sealing material. In Fig. 13, the sheath tube
For 20, a flexible bundling injection thin tube 6 is already incorporated before being introduced into the boring hole 5, and this may be embedded in the boring hole 5.

Further, as shown in FIG. 14, some of the plurality of outlets 22, 22, ...
2、22 ・ ・ 22 is covered with a bag packer, and when the injection material is injected into the ground, the bag packer is inflated in advance and the packer 2
After forming 24, 24, 24, these adjacent packers 24, 2
Through the space 25 formed between the four, the outlet 22 of the sheath 20
It is also possible to inject the injection material into the ground.

[0039]

According to the present invention described above, in improving the ground of an existing structure such as a building, a waste disposal site, a reservoir or a reservoir, etc., which is to be improved below an immovable inanimate object. , Boring diagonally from the ground surface near the ground to be improved (supporting ground) toward the lower part of the ground, and then boring the lower part of the inanimate body almost horizontally, and installing a flexible injection pipe in the obtained boring hole. By inserting and improving the ground through this injection pipe discharge port, the supporting ground below the inanimate object such as existing structures where it is difficult to improve the ground is efficiently and economically grounded without being restricted by site conditions. It can be improved, and ground liquefaction can be prevented in advance when ground subsidence or an earthquake occurs.

[Brief description of drawings]

FIG. 1 is a schematic view 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 bundled injection thin tube used in the present invention.

FIG. 4 is a plan view of a specific example of a drill rod used in the present invention, in which (a) shows a state of straight-ahead propulsion while rotating, and (b) shows a state of curved propulsion.

5A and 5B are explanatory views of specific boring in the field according to the present invention, in which (a) is boring by a boring head, (b) is insertion of a casing, and (c) is injection of a flexible bundled injection thin tube. , (D) shows the formation of the packer, and (e) shows the injection of the injection material.

FIG. 6 is an explanatory diagram of an example of drilling a drilling trajectory when drilling a boring hole on site.

FIG. 7 is an explanatory diagram of an example of forming a boring hole by expanding the hole after forming a drilling track on site.

FIG. 8 is a perspective view of a specific example of a hole expanding device used when forming a boring hole by expanding a hole.

FIG. 9 is a sectional view of a specific example for explaining the method of the present invention.

FIG. 10 is a partial cross-sectional view showing one injection mode of the method of the present invention.

FIG. 11 is a partial cross-sectional view showing one injection mode of the method of the present invention using a packer.

FIG. 12 is a partial cross-sectional view showing a usage state of a flexible sheath used in the present invention.

FIG. 13 is a partial cross-sectional view showing an injection mode when a flexible bundled injection thin tube and a sheath tube equipped with a packer are used.

FIG. 14 is a partial cross-sectional view showing an injection mode when a flexible bundled injection thin tube with a packer and a sheath tube with a packer attached are used.

FIG. 15 is a schematic diagram showing a known ground improvement of a supporting ground immediately below a structure.

[Explanation of symbols]

1 Inanimate body 2 Ground to be improved 3 near ground surface 4 ground 5 boring holes 5a Oblique hole 5b Horizontal hole 6 Flexible binding injection capillary 7 consolidation area 8 Flexible injection capillary 9 outlets 10 Flexible core material 11 bag packer 12 seals 13 hole wall 14 injection machine 15 winder 16 bands 17 drill head 18 Tip tapered blade 19 packers 20 flexible sheath 21 Perimeter wall 22 Discharge port 23 rubber sleeve 24 packers 25 spaces 26 bowling head 27 inductive antenna 28 boring machine 29 Reach 30 Drilling track 31 connection shaft 32 back reamers 33 swivel 34 Expander chuck 35 Start pit 36 casing 37 Bowling rod

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 500038891             Nobuyuki Construction Co., Ltd.             2-15 Iwamotocho, Chiyoda-ku, Tokyo (71) Applicant 000110000             Tomec Co., Ltd.             7-10-4 Nishigotanda, Shinagawa-ku, Tokyo (72) Inventor Shunsuke Shimada             2-15-10 Hongo, Bunkyo-ku, Tokyo Strengthened soil             Inside Giniering Co., Ltd. (72) Inventor Hitoshi Miura             Toa Construction Works, 5-4 Yonbancho, Chiyoda-ku, Tokyo             Business (72) Inventor Tadao Koyama             6-22 Matsugaeda-cho, Kita-ku, Osaka-shi, Osaka Japan             Foundation Technology Co., Ltd. (72) Inventor Hideo Kitagawa             2-1-15 Iwamotocho, Chiyoda-ku, Tokyo Nobuyuki             Inside the corporation (72) Inventor Ditmer Jenen             Switzerland 4805 Brittnow India             Strestrasse 1 Terra Aage             ー Head office F-term (reference) 2D040 AA01 AA04 AB01 BB01 BB03                       CB03 DA01 DA05 DA12 DC01                       DC02 DC06 FA01

Claims (12)

[Claims] 1. Boring by bending from the ground surface in the vicinity of the ground to be improved into the ground, or by arbitrarily combining bending and straight lines, and inserting a flexible binding injection thin tube into the obtained boring hole, This flexible bundled injection thin tube is formed by binding a plurality of flexible injection thin tubes so that these discharge ports are located at different axial positions, and the injection material should be improved through these discharge ports. A method for improving the ground, which comprises injecting into the ground. 2. The ground improvement method according to claim 1, wherein the flexible bundling injection thin tubes are bound by binding a flexible core material to a plurality of flexible injection thin tubes. 3. The ground improvement method according to claim 1, wherein any one of a plurality of discharge ports of the flexible bundling injection thin tube is covered with a bag packer. 4. The seal according to claim 1, wherein a seal is formed in the gap between the flexible binding injection capillary and the wall of the boring hole, and the injection material is injected into the ground through the respective discharge ports by breaking the seal. The ground improvement method described in 1. 5. 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 guiding system. 6. Boring to the opposite ground surface on the opposite side by bending from the ground surface near the ground to be improved into the ground, or by arbitrarily combining bending and straight lines, and then boring the flexible core material to the boring hole. Of the bundled flexible bundling injection thin tube should be improved by pulling the boring tube while pulling out the boring tube by hooking the core part to the head of the boring tube and filling the sealing material in the boring hole. A method for improving the ground, which is characterized in that the injection material is inserted into a predetermined position of the ground, and the injection material is injected from the discharge port of the flexible binding thin tube by breaking the seal of the sealing material. 7. The ground improvement method according to claim 6, wherein the sealing material is a drilling fluid or a solidifying fluid. 8. The flexible binding thin tube according to claim 6, wherein any one of the plurality of discharge ports is covered with a bag packer, and the flexible binding thin tube is to be improved at a predetermined position in the ground. The ground improvement method according to claim 6, wherein after being inserted into the bag, a solidifying material is injected into the bag packer to form a packer, and then the injecting material is injected from a discharge port of the flexible binding injection thin tube. 9. Boring from the ground surface near the ground to be improved into the ground, or by arbitrarily combining bending and straight lines to the adjacent ground surface on the opposite side, and then inserting a flexible bundling capillary tube inside Improve the flexible bundling injection thin tube by connecting the flexible sheath to the boring head, pulling the sheath into the boring hole, and then pulling out only the sheath while introducing the sealing material into the boring hole. A ground improvement method, which is arranged at a predetermined position to be injected, and injects an injection material from a discharge port of a flexible bundling injection thin tube by breaking a seal formed by the sealing material. 10. Boring from the ground surface near the ground to be improved into the ground or any combination of bending and straight line to the adjacent ground surface on the opposite side, and then having a plurality of discharge ports on the peripheral wall The flexible sheath is connected to a boring head, and the sheath is embedded in the boring hole while introducing the sealing material between the sheath and the boring hole. Insert a flexible bundling injection tubule, some of which are covered with bag puckers, so that the outlets of the pods are located between the bladder puckers of the flexible bundling tubule adjacent to each other. A method for improving a ground, comprising injecting an injection material through a discharge port of a flexible binding injection thin tube after forming a packer by expanding. 11. The flexible sheath according to claim 10, wherein the flexible sheath tube having the flexible binding injection capillary already built therein is connected to a boring head and embedded in the boring hole. Ground improvement method. 12. The bag packer according to claim 10, wherein some of the plurality of discharge ports of the sheath tube are covered with a bag packer, and the bag packer is inflated in advance before the injection material is injected into the ground. The ground improvement method according to claim 10, wherein after being formed, the injection material is injected into the ground through the space formed between the adjacent packers from the outlet of the sheath pipe.