JPH0881950A - Ground improving device and ground improving method - Google Patents

Abstract

PURPOSE: To facilitate construction and to improve construction capacity even when a ground, having a high content of boulder and sand and gravel, and a clayey ground are constructed and to reduce an amount of discharged kneaded material and kneaded slurry as much as possible. CONSTITUTION: A ground improving device comprises a curing material injection pipe 5, a discharge mud pipe 30, a mud separator 35, and a revolution elevation drive device 1. The curing material injection pipe 5 is provided at its upper part with a swivel 6 and at its lower part with a monitor mechanism 7. A peripheral ground is cut by a revolving jet of a curing material G continuously injected from the monitor mechanism 7, and air A or bentnite mud water W and air A. A kneaded material G0 or kneaded slurry W0 is recovered through a discharge mud pipe 30 and the bentnite mus water W is separated away from the kneaded slurry W for recycling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water blocking wall, an underground continuous wall,
The present invention relates to a ground improvement method and a device for constructing a foundation structure in stable construction of foundation ground.

[0002]

2. Description of the Related Art As a ground improvement method for constructing a basic structure, a method disclosed in Japanese Patent Publication No. 4-48894, which is proposed by the present applicant, has been known. In addition, as a modification of the above, the present applicant has previously proposed "a method for manufacturing an underground pile" in Japanese Patent Application No. 5-55230 (hereinafter referred to as "prior invention example"). FIG. 7: shows the Example apparatus which concerns on the prior invention example, and FIG.8 (a)-(e) is a figure which shows the procedure of the ground improvement method which concerns on the prior invention example. Hereinafter, this prior invention example will be described with reference to FIGS.

In the installation / drilling process << FIG. 8 (a) >>, a pile forming device M is installed on the ground and the leading conduit 10 is inserted to a predetermined depth in the ground. This ground improvement device M includes a swivel lift drive device 1, a hardening material ultrahigh pressure supply device 2, an ultrahigh pressure water supply device 3 and a compressed air supply device 4, a front conduit 10 supported by the swivel lift drive device 1, and a tip. And a hardening material injection pipe 5 made of a triple pipe inserted into the conduit 10.

A dedicated swivel 6A is connected to the upper end of the leading conduit 10 and a lower leading conduit 10B having a dedicated metal crown 9 is connected to the lower end of the leading conduit 10. The leading conduit 10 is vertically set at a predetermined construction position, the ultrahigh pressure water supply device 3 is connected to the muddy water inlet 6a of the swivel 6A, and the bentonite muddy water W is discharged downward from the lower leading conduit 10B, and the swivel lifting drive device 1 Actuate the first conduit 1
0 is rotated while descending to form the vertical hole 10a with the metal crown 9, and the front conduit 10 is inserted to a predetermined depth in the ground.

In the injection pipe mounting step << FIG. 8 (b) >>, as shown in FIG. 6 and FIG. 8 (b), the hardening material injection pipe 5 is inserted into the tip conduit 10 and the hardening material injection pipe 5 is inserted. Is protruded from the lower end and the upper end of the front conduit 10, and a sludge collector 20 is attached to the upper end of the front conduit 10.
0 and the hardening material injection pipe 5 are integrally connected. A swivel 6 << FIG. 7 (A) >> is connected to the upper end of the hardening material injection pipe 5, and a monitor mechanism 7 is connected to the lower end of the hardening material injection pipe 5.
<Figure 7 (B)> is connected. The sludge collector 20 has a sludge discharge port 21a, and the sludge discharge port 21a communicates with an insertion gap 20a between the tip conduit 10 and the hardening material injection pipe 5. The sludge is raised from this insertion gap 20a and discharged. Is configured.

As shown in FIG. 7 (A), the swivel body 6 has a first inlet 6a opened on the upper side surface of the swivel body 60 and a swivel body 60 communicating with the first inlet 6a.
A passage 6e extending to the lower end surface along the axis of, an air inlet 6c opened on the lower side surface, a second inlet 6b formed in the intermediate height portion, a passage 6f communicating with the second inlet 6b, An air passage 6g communicating with the inlet 6c is provided. The passage 6f and the air passage 6g are each formed around the passage 6e as an annular passage independently of the passage 6e.

As shown in FIG. 7 (B), the monitor mechanism 7 has a passage 7e vertically penetrating along the axis of the monitor body 70 and a side surface of the monitor body 70 that is radially outwardly opened. A first injection nozzle 7a communicating with the passage 7e,
A first air nozzle 7c that ejects air radially outward from the periphery of the first injection nozzle 7a, and a position higher than the first injection nozzle 7a on the side surface of the monitor body 70 opposite to the opening direction of the first injection nozzle 7a. It is provided with a second jet nozzle 7b which is opened in a direction, and a second air nozzle 7d which jets air radially outward from the periphery of the second jet nozzle 7b. When excavating the vertical hole 10a at the bottom of the monitor body 70,
A water supply hole 75 for discharging the water W downward is opened, and the water supply hole 75 is closed by inserting a ball valve 71 from the first inlet 6a of the swivel 6 when the excavation of the vertical hole 10a is completed. Reference numeral 74 is a check valve, and 8 is a metal crown for excavating the vertical hole 10a.

In the injection test step << FIG. 8 (c) >>, the hardening material ultra-high pressure supply device 2 is attached to the first inlet 6a of the swivel 6,
An ultra high pressure water supply device 3 is connected to the second inlet 6b, a compressed air supply device 4 is connected to the air inlet 6c, and the swivel lifting drive device 1 is operated to try the tip conduit 10 and the hardening material injection pipe 5. The slewing drive is integrally performed at a rotational speed that is set specifically. Then, the super-high pressure water W is continuously jetted from the second jet nozzle 7b at the upper stage of the monitor mechanism 7 and the high pressure air is jetted from the second air nozzle 7d around it in the pipe radial direction to cut the surrounding ground. On the other hand, the monitor mechanism 7
Curing material G is ejected from the lower first ejection nozzle 7a and high-pressure air is ejected from the surrounding first air nozzle 7c. As a result, if the injection test is successful, the process proceeds to the creation process.

In the forming step << FIG. 8 (d) >>, the swivel lifting drive device 1 is actuated to drive the leading conduit 10 and the hardening material injection pipe 5 while swinging them integrally, thereby continuously pulling them up at an ultrahigh pressure. The ultrahigh-pressure water W in the upper stage and the hardened material G in the lower stage which are jetted out are pulled up while swirling, and the ground around the ground is cut by the jetting force, and the cutting mud and water W and the hardened material are cut in the cutting area 11. An uncured pile P filled with a kneading material formed by kneading with G is created. At this time, the excess kneaded material is pushed up by the high pressure of water or air ejected from the injection nozzles 7a, 7b, 7c, 7d, and the front conduit 10
It is discharged from the discharge port 21a of the sludge collector 20 through the insertion gap 20a between the hardening material injection pipe 5 and the hardening material injection pipe 5.

In the drawing and washing step << FIG. 8 (e) >>, the hardening material injection pipe 5 is drawn to the ground, and the inside of the pipe is washed with fresh water. After that, it moves to the next formation point and the uncured pile P is formed in the soil by the same procedure. The foundation structure 13 is formed in the ground by curing the uncured pile P.

[0011]

The ground improvement methods of the prior art example and the prior invention example have the following problems. Excessive kneading material and the like are discharged to the ground through the narrow gaps of the vertical holes 10a and the narrow insertion gaps 20a between the leading conduit 10 and the hardening material injection pipe 5. When creating a ground with a high content of sand, gravel, etc., or a viscous ground, it is difficult to discharge boulders, gravel, and lumps of viscosity from a narrow gap, so construction is difficult and the construction capacity can be increased. There wasn't. Here, the kneading material means a material formed by kneading the cutting mud and the hardening material G. Further, when the amount of discharged kneaded material or the like increases, the cost of sludge treatment becomes expensive. The present invention has been made in consideration of such circumstances, and an object of the present invention is to solve the above-mentioned difficulties.

[0012]

In order to solve the above problems, the present invention is configured as follows. The invention according to claim 1 comprises a hardening material injection pipe 5, a mud discharge pipe 30, a muddy water separator 35, and a swivel lifting drive device 1, and the hardening material injection pipe 5 is provided above the hardening material injection pipe 5. The swivel 6 is attached to the lower part thereof with the monitor mechanism 7, and the swivel 6 is provided with the hardening material ultra-high pressure supply device 2, ultra-high pressure water supply device 3 and compressed air supply device 4.
And the curable material G or bentonite mud W from the monitor mechanism 7 and the air A respectively simultaneously and continuously from the surroundings thereof in the pipe radial direction. The swivel 6A is attached to the upper part of the swivel 6A, and the monitor mechanism 7A is attached to the lower part of the swivel 6A. The kneading material G _{0 of the} cutting mud and the hardening material G or the kneading slurry W ₀ of the cutting mud and the bentonite mud W is sucked in from the monitoring mechanism 7A, From the discharge port 61 of 6A, the kneading material G ₀ or the kneading slurry W
₀ is capable of being discharged, and the swivel lifting drive device 1 swivels the hardening material injection pipe 5 so that the hardening material injection pipe 5 and the sludge pipe 30 can be inserted in parallel from the ground surface into the ground. The kneading material G ₀ and the air A or the bentonite mud water W and the air A, which are configured to be capable of being pulled up and driven to be pulled up in parallel with the hardening material injecting pipe 5, and continuously ejected from the monitor mechanism 7. The ground around it is cut with a swirling jet flow of and the kneading material G ₀ or the kneading slurry W ₀ by the mud discharge pipe 30.
The ground improvement device is characterized in that Here, the kneading slurry W ₀ refers to what is formed by kneading cutting mud and bentonite mud.

According to the second aspect of the present invention, a hardening material injection pipe 5 is provided.
Inserted from the surface to the target depth in the ground
Hardener G and air A from the swivel 6 assembled on top of the
Is press-fitted with ultrahigh pressure, and the hardening material G is supplied from the monitor mechanism 7 assembled to the lower part of the hardening material injection pipe 5, and the air A
Are continuously jetted in the pipe radial direction at the same time, and the hardening material injection pipe 5 is driven to be pulled up while being swung, whereby the swirling jet of the hardening material G and the air A continuously jetted from the monitor mechanism 7 is generated. The ground around the ground is cut, and an uncured pile P filled with a kneading material G ₀ of cutting mud and a hardening material G is created in the cutting area 11, and the uncured pile P is hardened, thereby In the ground improvement method for constructing the foundation structure 13, the mud pipe 30 is inserted in parallel with the hardening material injection pipe 5 from the surface to the target depth in the ground, and the mud pipe 3
In this method, the surplus kneaded material G ₀ is recovered by ₀ .

According to the third aspect of the present invention, the front conduit 10 and the sludge discharge pipe 30 are inserted in parallel from the surface to a target depth in the ground, and the hardening material injection pipe 5 is inserted into the front conduit 10. The hardening material injection pipe 5 is projected from the lower end and the upper end of the leading conduit 10, and bentonite mud water W and air A are press-fitted from the swivel 6 assembled on the upper portion of the hardening material injection pipe 5 at an ultrahigh pressure to The bentonite muddy water W and the air A from its surroundings are continuously jetted continuously in the pipe radial direction simultaneously from the monitor mechanism 7 attached to the lower part, and the leading conduit 10 and the hardening material injection pipe 5 are swivel-driven while being pulled up. Thus, the ground around the bentonite mud water W and the air A continuously jetted from the monitor mechanism 7 is cut to form a cutting area 11 filled with the kneading sludge W _0. 1 Inserting the lead pipe 10 to the bag member 36 soaked with curable material injection pipe 5 within the Haidorokan 30
By collecting the kneading sludge W ₀ in step S1 and injecting the hardening material G into the bag member 36 through the hardening material injection pipe 5, the uncured pile P filled with the hardening material G is cut into the cutting area 11. The ground improvement method is characterized by forming the foundation structure 13 in the ground by forming and curing the uncured pile P.

According to the fourth aspect of the present invention, when the uncured piles P are formed adjacent to each other by the ground improvement method according to the second and third aspects, the ground improvement method according to the second aspect is used. The surplus kneading material G ₀ collected in the sludge pipe 30 is injected into the bag member 36 as the hardening material G through the hardening material injection pipe 5 by the ground improvement method according to claim 3. This is a ground improvement method.

According to a fifth aspect of the present invention, a hardening material injection pipe 5 is provided.
Swivel 6 installed on the upper part of the hardening material injection pipe 5 by inserting the sludge pipe 30 and the sludge pipe 30 in parallel from the surface to a predetermined depth in the ground.
Monitoring mechanism 7 in which bentonite muddy water W and air A are press-fitted at a super high pressure from the
Bentonite muddy water W and air A around it.
Bentonite mud water W and air A are continuously jetted from the monitor mechanism 7 by continuously jetting them simultaneously in the radial direction of the pipe and driving the hardening material jetting pipe 5 to swing down.
While cutting the ground around it with a swirling jet flow of, the excess kneading sludge W ₀ is collected by the drainage pipe 30 and the bentonite mud W is circulated and used to cut the area filled with the kneading sludge W _0. 11, forming a cutting area 1 through the sludge pipe 30
By injecting the hardening material G into 1 to replace the kneading sludge W ₀ with the hardening material G to form the uncured pile P, the uncured pile P is hardened, and the foundation structure 1 is buried in the ground.
3 is a method for improving the ground.

[0017]

According to the invention described in claim 1, the turning and elevating drive device 1 inserts the hardening material injection pipe 5 and the sludge discharge pipe 30 in parallel from the ground surface to the target depth in the ground. Then, the turning / lifting driving device 1 pulls up the hardening material injection pipe 5 while turning it, and also pulls up the sludge mud pipe 30 in parallel with the hardening material injection pipe 5 to continuously eject from the monitor mechanism 7. The ground around the hardened material G and the air A or the bentonite muddy water W and the air A is cut by a swirling jet flow. Excessive kneading material G ₀ or kneading sludge W ₀ generated at that time is collected by the mud discharge pipe 30.

As described above, since the surplus kneading material G ₀ or the kneading sludge W ₀ is collected by the dedicated sludge pipe 30, the ground having a high content ratio of cobblestone, gravel, etc. or the viscous ground is formed. Also in this case, boulders, gravel, and lumps of viscosity are easily discharged, so that the construction is easy and the construction ability can be enhanced.
Since the discharged kneading sludge W ₀ is not kneaded with the hardening material G, the bentonite mud W
Can be separated and reused.

According to the second aspect of the present invention, the hardening material injection pipe 5 and the sludge discharge pipe 30 are inserted in parallel from the ground surface to the target depth in the ground, and the hardening material injection pipe 5 is driven to rotate while being pulled up. At the same time, the sludge discharge pipe 30 is pulled up and driven in parallel with the hardening material injection pipe 5, and the surrounding ground is cut by the swirling jet of the hardening material G and the air A continuously jetted from the monitor mechanism 7. Kneading material G _{0 of} cutting mud and hardening material G generated at that time
Are collected by the sludge pipe 30.

As described above, since the surplus kneading material G ₀ is collected by the dedicated sludge pipe 30, even when the ground having a high content ratio of cobblestone, gravel, etc. or the viscous ground is formed, Cobblestone, gravel and lumps of viscosity are easily discharged, so construction is easy and construction capacity can be enhanced.

In the present invention according to claim 3, the leading conduit 10
And the mud pipe 30 are inserted in parallel from the ground surface to the target depth in the ground, the hardening material injection pipe 5 is inserted in the front conduit 10, and the front conduit 10 and the hardening material injection pipe 5 are integrally driven to rotate. While pulling up, the mud pipe 30 is used as the hardening material injection pipe 5.
And the ground around it is cut by a swirling jet of bentonite mud water W and air A that are continuously driven by the monitor mechanism 7 and are pulled up in parallel. Excessive kneading sludge W ₀ generated at that time is collected by the sludge discharge pipe 30. Next, kneading slurry W ₀
The cutting member 11 is filled with the inside of the tip conduit 10 to immerse the bag member 36 by the hardening material injection pipe 5, and the waste mud pipe 30 collects the kneading sludge W ₀ while the hardening material injection pipe 5 is inserted. The hardening material G is injected into the bag member 36 through the above, and the uncured pile P filled with the hardening material G is formed in the cutting area 11 thereof.

As described above, since the surplus kneading sludge W ₀ is collected by the dedicated sludge pipe 30, even when the ground having a high content of boulders, gravel and the like or the viscous ground is formed, Cobblestone, gravel and lumps of viscosity are easily discharged, so construction is easy and construction capacity can be enhanced. Also, the curing material G
Since the hardener G is not mixed into the discharged kneading sludge W ₀ since it is injected into the bag member 36, the bentonite mud W can be separated from the recovered kneading sludge W ₀ and reused. it can.

According to the present invention described in claim 4, two uncured piles P are formed adjacent to each other at a time by the ground improvement method described in claims 2 and 3. Then, when forming the two uncured piles P, the surplus kneading material G ₀ recovered by the mud pipe 30 by the ground improvement method according to claim 2.
Is injected as a hardening material into the bag member 36 through the hardening material injection pipe 5 by the ground improvement method according to the third aspect.

As described above, since the excess kneading material G ₀ collected in the sludge discharge pipe 30 is injected into the bag member 36 as the hardening material G and used, the amount of the kneading material G ₀ to be treated as sludge is set. It is extremely small, and the sludge treatment cost can be greatly reduced. Further, the surplus kneading material G ₀ is used for the exclusive sludge pipe 30.
Since it is collected at, even when the ground with a high content rate of boulders and gravel, or the ground of viscous nature is created, the boulders, gravel, and lumps of viscosity are easily discharged, so the construction is easy and the construction ability is high. Can be increased.

According to the fifth aspect of the present invention, the hardening material injection pipe 5 and the sludge discharge pipe 30 are inserted in parallel from the ground surface to a predetermined depth in the ground, and the hardening material injection pipe 5 is driven to rotate and descend. , The sludge pipe 30 is driven in parallel with the hardening material injection pipe 5,
The surrounding ground is cut by a swirling jet of bentonite muddy water W and air A continuously jetted from the monitor mechanism 7. Excessive kneading sludge W ₀ generated at that time is collected by the drainage pipe 30, and bentonite mud W is circulated to form the cutting region 11 filled with the kneading sludge W ₀ .
Then, the hardening material G having a high specific gravity is injected into the cutting area 11 through the mud discharge pipe 30 to replace the kneading sludge W ₀ with the hardening material G to form the uncured pile P.

As described above, the surplus kneading sludge W ₀ is collected by the dedicated sludge pipe 30, so that even when the ground having a high content of boulders, gravel, etc. or the viscous ground is formed, Cobblestone, gravel and lumps of viscosity are easily discharged, so construction is easy and construction capacity can be enhanced. Moreover, heavier hardener G specific gravity is injected into the cutting zone 11 via Haidorokan 30, since it is also less cured material G is mixed in the kneading slip W _0, from the kneading slip W ₀ to be discharged Bentonite muddy water W can be separated and reused.

[0027]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 shows a ground improvement device according to an embodiment of the present invention and is a view corresponding to FIG. This ground improvement device M is supported by a swivel lift drive device 1, a hardening material ultrahigh pressure supply device 2, an ultrahigh pressure water supply device 3, a compressed air supply device 4, and a swivel lift drive device 1 similar to the conventional example. The hardened material injection pipe 5, the drainage pipe 30, the drainage pump 32, and the muddy water separator 35 are provided.

A swivel 6 similar to that shown in FIG. 7A is attached to the upper portion of the hardening material injection pipe 5, and a monitor mechanism 7 similar to that shown in FIG. 7B is attached to the lower portion. A swivel 6A is attached to the upper part of the sludge discharge pipe 30, and a monitor mechanism 7A is attached to the lower part thereof. The kneading sludge W ₀ of the cutting mud and bentonite mud W is sucked in from the suction port 7a of the monitor mechanism 7A, and the swivel 6
The discharge mud pump 32 connected to the discharge port 61 of B discharges the kneading sludge W ₀ to the mud separator 35. The swivel lifting drive device 1 allows the hardening material injection pipe 5 and the sludge discharge pipe 30 to be inserted in parallel from the ground surface into the ground so that the hardening material injection pipe 5 can be pulled up while being swung and driven, and The mud pipe 30 can be pulled up and driven in parallel with the hardening material injection pipe 5.

Reference numeral 3A in FIG. 1 is a storage container for bentonite muddy water W, 3B is a three-way valve, and the three-way valve 3B is appropriately switched to collect / separate from the bentonite muddy water W in the storage container 3A or the muddy water separator 35. Bentonite muddy water W
Is configured for use. That is, the swirling jet of bentonite muddy water W and air A continuously jetted from the jet nozzle 7b cuts the ground around the swirling jet, and the drain pipe 3
No. _{0 is used} to collect the kneading sludge W ₀ , and the mud separator 35 separates the bentonite mud W. Next, a ground improvement method for construction using the ground improvement device M will be described.

<< First Ground Improvement Method >> FIGS. 2A to 2D are process diagrams showing the first ground improvement method. Among the (a) installation / drilling process, (b) injection test process, (c) creation process, and (d) extraction / cleaning process, the prior invention example << Fig. 8 (a)-
The description overlapping with (e) >> is omitted as much as possible, and the characteristic part of the present invention will be described.

(A) Installation / drilling process In the installation process, the hardening material injection pipe 5 and the sludge discharge pipe 30 are vertically set up at a predetermined construction position, and the first inlet 6a of the swivel 6 of the hardening material injection pipe 5 and the exhaust pipe are discharged. Discharge port 61 of swivel 6A of mud pipe 30
The ultra high pressure water supply device 3 is connected to. In the drilling process,
Bentonite muddy water W is discharged downward from the monitoring mechanism 7 of the hardening material injection pipe 5 and the monitoring mechanism 7A of the mud discharge pipe 30, and the turning lifting drive device 1 operates the hardening material injection pipe 5 and the mud discharge pipe 30 to turn. While lowering, the metal crown 8 is used to perforate the vertical holes 10a, respectively, and the hardening material injection pipe 5 and the mud discharge pipe 30 are inserted in parallel to the target depth in the ground.

(B) Injection test step In the injection test step, the hardening material super-high pressure supply device 2 is installed at the first inlet 6a and the second inlet 6b of the swivel 6 of the hardening material injection pipe 5.
And the compressed air supply device 4 is connected to the air inlet 6c, and the sludge pump 32 is connected to the discharge port 61 of the swivel 6A of the sludge pipe 30. Then, the swivel lifting drive device 1 is operated to swivel the hardening material injection pipe 5 at a trially set rotation speed. And the monitor mechanism 7
From the first and second injection nozzles 7a and 7b, and the first and second air nozzles 7c and 7c
High-pressure air is continuously jetted from 7d in the pipe radial direction to cut the ground around it. As a result, if the injection test is successful, the process proceeds to the creation process.

(C) Creating Step In the creating step, the turning and elevating and lowering drive device 1 is operated to pull up the hardening material injection pipe 5 while turning and driving the hardening material injection pipe 5, so that the hardening material G continuously ejected at an ultrahigh pressure is obtained. The uncured pile P filled with the kneading material W ₀ formed by kneading the cutting mud and the hardened material G in the cutting area 11 while pulling up while rotating and cutting the ground around the ground with the jetting force
Is created. At this time, while pulling up the sludge discharge pipe 30 in parallel with the hardening material injecting pipe 5, the excess kneading material W ₀ is discharged through this drainage pipe 30.

By the way, in the forming process, the hardening material G
Discharge pressure is 100 ~ 400Kg / cm ² , discharge amount is 70 ~ 30
The discharge pressure of compressed air is 6 to 30 kg / cm ² , and the discharge amount is 1.5 to 15.0 m ³ / min. Further, the radius of the cutting area 11 is measured by an ultrasonic detector (not shown) provided in the monitor mechanism 7, and the work is performed while balancing the injection amount of the hardening material G and the discharge amount of the kneading material. Figure 2
Reference numeral 33 in (C) is a measuring instrument for measuring the discharge amount. An ultrasonic detector (not shown) provided in the monitor mechanism 7 includes the swivel 6, the hardening material injection pipe 5, and the monitor mechanism 7.
Is connected to the measurement cables inserted in the central passages 6e to 7e, and the amount of sludge is measured on the ground.

(D) Extraction cleaning step In the extraction cleaning step, the hardening material injection pipe 5 and the sludge discharge pipe 30 are extracted above the ground, and the inside of the pipe is washed with fresh water. After that, it moves to the next formation point, and the uncured pile P is formed in the ground by the same procedure. By curing this uncured pile P,
The foundation structure 13 is formed in the ground.

<< Second Ground Improvement Method >> FIGS. 3A to 3D are process diagrams showing a second ground improvement method. (a) Installation / drilling process In the installation process, the front conduit 10 and the sludge pipe 3 are placed at the predetermined construction positions.
0 is set vertically, and the ultrahigh-pressure water supply device 3 is connected to the inlet of the swivel 6 of the leading conduit 10 and the outlet 61 of the swivel 6A of the sludge pipe 30. In the perforation step, bentonite mud water W is discharged downward from each monitor mechanism, and the swivel lift drive device 1 inserts the tip conduit 10 and the mud discharge pipe 30 in parallel to a target depth in the ground.

(B) Injecting / Cutting Step In the injecting / cutting step, the hardening material injection pipe 5 having the monitor mechanism 7 assembled therein is inserted into the front conduit 10, and the hardening material injection pipe 5 is inserted into the lower end and the upper end of the front conduit 10. The swivel 6 is attached to the upper part of the hardening material injection pipe 5 so as to further protrude, and the tip conduit 10 and the hardening material injection pipe 5 are integrally rotatably fixed. The ultrahigh pressure water supply device 3 is connected to the first inlet 6a and the second inlet 6b of the swivel 6 of the hardening material injection pipe 5, the compressed air supply device 4 is connected to the air inlet 6c, and the swivel 6 of the sludge pipe 30 is connected.
A muddy water separator 35 is connected to the discharge port 61 of A via the mud pump 32, and the bentonite muddy water W separated by the muddy water separator 35 is reusably connected.

Then, the turning and lifting drive device 1 is operated,
The hardening material injection pipe 5 is driven to rotate at a trially set rotational speed. Then, the bentonite muddy water W of ultra-high pressure is discharged from the first and second injection nozzles 7a and 7b of the monitor mechanism 7,
High-pressure air is continuously jetted in the pipe radial direction from the first and second air nozzles 7c and 7d around them to cut the ground around them. As a result, if the injection test is successful, the cutting process is started. In the cutting process, the tip conduit 10 and the hardening material injection pipe 5 are driven while being swung, and the sludge discharge pipe 30 is also driven in parallel,
The surrounding ground is cut by a swirling jet of bentonite mud water W and air A continuously jetted from the jet nozzles 7a and 7b, and excess kneading sludge W ₀ generated at that time is discharged from the mud pipe 30.
And the bentonite mud water W is circulated and used. In this way, the cutting region 11 filled with the kneading slurry W ₀ is formed.

Incidentally, in the jetting / cutting process, the discharge pressure of the bentonite mud water W is 200 to 600 kg / cm.
² , the discharge rate is 60 to 300 l / min, the discharge pressure of compressed air is 6 to 30 kg / cm ² , and the discharge rate is 1.5 to 15.0 m ³ / min. Also in this case, while measuring the radius of the cutting area 11 by an ultrasonic detector (not shown) provided in the monitor mechanism 7, while balancing the injection amount of bentonite mud W and the discharge amount of the kneading sludge W _0. Can be installed.

(D) Curing material injecting step In the curing material injecting step, the curing material injecting pipe 5 is once pulled up,
The base 37 of the bag member 36 is screwed into and attached to the lower end of the hardening material injection pipe 5 as shown in a partially enlarged view (e). The injection pressure of the hardening material G is set to 0 to 15 kg / by attaching the check valve 37a to the base 37.
It can be set to about cm ² . The bag member 36
Is made of a fiber material such as cloth, synthetic resin, or metal, and has a required size, and a weight is attached to the lower end to facilitate dipping. The bag member 36 is inserted into the front conduit 10 through the hardening material injection pipe 5 and immersed in the central portion of the cutting area 11. Next, while the kneading sludge W ₀ is collected by the sludge discharge pipe 30, the hardening material injection pipe 5 is inserted into the dipped bag member 36.
By injecting the hardening material G through the cutting area 1
The uncured pile P filled with the hardening material G is created in 1.

(D) Extraction / cleaning step In the extraction / cleaning step, the curing material injection pipe 5 is twisted to make the bag member 36.
After removing the base 37, the hardening material injection pipe 5 and the sludge discharge pipe 30 are pulled out to the ground as in FIG. 2D, and the inside of the pipe is washed with fresh water.

<< Third Ground Improvement Method >> FIG. 4 is a partial process diagram showing a third ground improvement method. The third ground improvement method can be applied when the foundation structures 13 are formed adjacent to each other by the first and second ground improvement methods. That is, in forming the uncured piles P and P in the cutting areas 11 and 11 formed adjacent to each other, excess surplus collected in the mud pipe 30 in the first ground improvement method << Fig. 2 (c) Creation step >> Second kneading method for kneading material G ₀ << Fig. 3 (c)
This is a method of injecting into the bag member 35 as a hardening material through the hardening material injection pipe 5 in the hardening material injection step >>.

As described above, since the surplus kneading material G ₀ collected in the sludge discharge pipe 30 is injected into the bag member 36 as a hardening material for use, the amount of the kneading material G ₀ to be treated as sludge is extremely high. Therefore, the sludge treatment cost can be significantly reduced. Further, since the surplus kneading material G ₀ is collected by the dedicated sludge pipe 30, even when the ground having a high content rate of cobblestone or gravel or the viscous ground is created, the cobblestone, gravel, or a lump of viscosity is generated. Is easily discharged, so construction is easy and construction capacity can be enhanced.

<< Fourth Ground Improvement Method >> FIG. 5 is a process diagram showing a fourth ground improvement method. (a) Installation / drilling process In the installation / drilling process, the hardening material injection pipe 5 and the mud discharge pipe 30 are arranged in parallel from the ground surface to a predetermined depth (upper limit depth of the foundation structure 13 to be constructed). Insert up to.

(B) Jetting / Cutting Step In the jetting / cutting step, the surplus kneading sludge W ₀ is cut while cutting the surrounding ground with a swirling jet of bentonite mud W and air A continuously jetted from the jet nozzle. The sludge pipe 3
The bentonite mud water W is circulated and used. In this way, the cutting area 11 filled with the kneading slurry W ₀ is formed.

(C) Hardening Material Injecting Step In the hardening material injecting step, the hardening material injecting pipe 5 is pulled out, and the hardening material ultra-high pressure supply device 2 is connected to the swivel 6A of the mud discharging pipe 30 and the mud discharging pipe 30 is used. By injecting the hardened material G having a high specific gravity into the cutting area 11, the kneading sludge W ₀ is replaced with the hardened material G to form the uncured pile P. Since the vertical hole 10a opens when the hardening material injection pipe 5 is pulled out,
The kneading sludge W ₀ overflows into the pit P formed on the ground surface through the vertical hole 10a. This kneading slurry W ₀ is vacuum V
The bentonite muddy water W is discharged by the muddy water separator 35 and is reused. (d) In the pull-out cleaning step, the hardener injection pipe 5 and the sludge discharge pipe 30 are washed with fresh water as described above.

The present invention is not limited to the above embodiment,
Swivel 6, monitor mechanism 7, or hardening material injection pipe 5
Also, double pipes to triple pipes are appropriately applied to the sludge pipe 30
The structure of can also be implemented with appropriate changes.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a ground improvement device applied to a ground improvement method of the present invention.

FIG. 2 is an explanatory diagram showing a procedure of a first ground improvement method according to the present invention.

FIG. 3 is an explanatory diagram showing a procedure of a second ground improvement method according to the present invention.

FIG. 4 is an explanatory diagram showing a main part of a third ground improvement method according to the present invention.

FIG. 5 is an explanatory diagram showing a procedure of a fourth ground improvement method according to the present invention.

FIG. 6 is a schematic diagram of an apparatus applied to the ground improvement method of the previous invention example.

7A and 7B are cross-sectional views of a swivel and a monitor mechanism used in the ground improvement method, respectively.

FIG. 8 is an explanatory diagram showing a procedure of a ground improvement method according to a prior invention example.

[Explanation of symbols]

5 ... Hardening material injection pipe, 6.6A ... Swivel, 7.7A ... Monitoring mechanism, 10 ... Lead conduit, 11 ... Cutting area, 13 ... Basic structure, 30 ... Mud pipe, 35 ... Mud separator, 36 ... , A ...
Air, G ... hardener, G ₀ ... kneaded material, M ... soil modifying apparatus, P ... uncured pile, W ... bentonite mud, W ₀ ...
Kneading slurry.

Claims (5)

[Claims] 1. A hardening material injection pipe (5), a sludge discharge pipe (30),
It comprises a muddy water separator (35) and a swivel lifting drive device (1), and the hardening material injection pipe (5) has a swivel (6) at its upper part,
Attach the monitor mechanism (7) to the bottom of the swivel (6).
The hardening material ultra-high pressure supply device (2), the ultra-high pressure water supply device (3) and the compressed air supply device (4) are configured to be connectable, and the hardening mechanism (G) or bentonite muddy water ( W)
Are configured so that air (A) can be simultaneously and continuously ejected from their surroundings in the pipe radial direction. The sludge pipe (30) has a swivel (6A) at its upper portion and a monitoring mechanism (at the lower portion thereof). 7A) assembled, monitor mechanism
Kneading material from (7A) and the cutting mud and cured material (G) (G ₀₎ or cutting mud and kneaded mud (W ₀₎ of the bentonite mud (W) suction, kneading material from the swivel (6A) (G ₀ ) Or a kneading sludge (W ₀ ) can be discharged, and the swivel lifting drive device (1) inserts the hardening material injection pipe (5) and the sludge discharge pipe (30) in parallel from the surface to the ground. It is possible to pull up the curable material injection pipe (5) while rotating it,
Moreover, the mud discharge pipe (30) is constructed so that it can be pulled up and driven in parallel with the hardening material injection pipe (5), and the hardening material (G) and the air (A) or bentonite muddy water continuously jetted from the monitoring mechanism (7). The ground around it is cut by a swirling jet of (W) and air (A), and the kneading material (G ₀ ) or the kneading sludge (W ₀ ) can be collected by the drainage mud pipe (30). A characteristic ground improvement device. 2. The hardening material injection pipe (5) is inserted from the surface to the target depth in the ground, and the hardening material (G) and the air (A) are fed from the swivel (6) mounted on the hardening material injection pipe (5). ) And are press-fitted with ultra high pressure, and the monitor mechanism (7) is attached to the bottom of the hardening material injection pipe (5)
The curing mechanism (G) and the air (A) are continuously and simultaneously jetted continuously in the pipe radial direction from the surroundings, and the curing material injection pipe (5) is swivel-driven and pulled up to drive the monitor mechanism (7). The ground around it is cut by the swirling jet of the hardening material (G) and the air (A) that are continuously jetted from the ground, and the kneading material (G) of cutting mud and hardening material (G) is cut in this cutting area (11). _In the ground improvement method for forming a foundation structure (13) in the ground by forming an uncured pile (P) filled with ₀ ) and curing the uncured pile (P), Ground improvement characterized by inserting a sludge pipe (30) in parallel with the pipe (5) from the surface to a target depth in the ground, and collecting excess kneaded material (G ₀ ) by the sludge pipe (30). Method. 3. The front conduit (10) and the sludge discharge pipe (30) are inserted in parallel from the surface to the target depth in the ground, and the hardening material injection pipe (5) is inserted into the front conduit (10). The hardening material injection pipe (5) is protruded from the lower end and the upper end of the front conduit (10), and the swivel (6) attached to the upper part of the hardening material injection pipe (5) is connected to bentonite muddy water (W) and air (A). Monitor mechanism (7) that is press-fitted with ultra-high pressure and is attached to the bottom of the hardening material injection pipe (5).
Bentonite muddy water (W), and air (A) around it
Are continuously ejected simultaneously in the radial direction of the pipe, and the leading conduit (10) and the hardening material injection pipe (5) are driven to be pulled up while being swiveled, so that they are continuously ejected from the monitor mechanism (7). The ground around it is cut by a swirling jet of bentonite muddy water (W) and air (A), and kneaded sludge (W ₀ )
Forming a cutting area (11) filled with the above, and inserting the inside of the leading conduit (10) into this cutting area (11) and immersing the bag member (36) by the hardening material injection pipe (5), While collecting the kneaded slurry (W ₀ ) in the mud pipe (30), the hardening material (G) is put into the bag member (36) through the hardening material injection pipe (5).
By injecting the hardened material (G) into the cutting area (11)
An uncured pile (P) filled with the above is formed, and the foundation structure (13) is formed in the ground by curing the uncured pile (P). 4. When the uncured piles (P) are formed adjacent to each other by the ground improvement method according to claim 2 or 3, the mud pipe (30) is formed by the ground improvement method according to claim 2. excess kneading material recovered in) the (G _0), to inject into the bag member as the curing material via the cured material injection pipe (5) by ground improvement method according to claim 3 (36) A characteristic ground improvement method. 5. A swivel (6) assembled on the upper part of the hardening material injection pipe (5) by inserting the hardening material injection pipe (5) and the sludge discharge pipe (30) in parallel from the ground surface to a predetermined depth in the ground. )) Bentonite muddy water (W) and air (A) were press-fitted, and the monitor mechanism (7) was attached to the lower part of the hardening material injection pipe (5).
Bentonite muddy water (W) from its injection nozzle (7a) and air (A) from the surroundings are simultaneously and continuously injected in the pipe radial direction, and the hardening material injection pipe (5) is swung down and driven, Bentonite muddy water continuously ejected from the monitor mechanism (7)
(W) and air (A) are used to cut the surrounding ground with a swirling jet flow, while collecting excess cutting sludge (W ₀ ) in the mud discharge pipe (30) and circulating bentonite mud (W) By forming the cutting area (11) filled with the kneading slurry (W ₀ ), and by injecting the hardening material (G) into the cutting area (11) through the drainage pipe (30), The kneading sludge (W ₀ ) is replaced with a hardening material (G) to form an uncured pile (P), and the uncured pile (P) is cured to form a basic structure (13) in the ground. A ground improvement method characterized by: