JPH086311B2 - Ground improvement body construction method and its equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a ground improvement body and an apparatus therefor for the purpose of improving soft ground, building structure foundation and the like.

[0002]

2. Description of the Related Art A ground improvement method by spraying a curing agent has been developed through various trials and errors. The inventors of the present invention developed a ground improvement device equipped with a stirring blade and an excavation blade, and further developed a construction method and device using a curing agent and air injection with a rotating function by a spiral groove (July 26, 1991) , And the application filed on August 19, of the same year) made a breakthrough in the construction of a large-diameter and tough ground improvement body. Furthermore, the inventors of the present invention have proposed a construction method and device equipped with a mechanism for eliminating the accumulation of air and slime at the target point of excavation and making the soil mud pressure constant (August 1st, 1991).
4th application) was also developed. We have already applied for these inventions.

[0003]

However, it is an eternal problem for the inventor of the present invention to create a more uniform and tough ground improvement body while maintaining economic efficiency and certainty. I have been studying from various angles. The present invention was devised in the course of such development research, and more smoothly removes slime in the ground, and more smoothly stabilizes the mud pressure in the ground, so that the ground to be excavated is more uniform. The purpose is to create improved ground.

[0004]

In order to achieve the above object, a curing agent injection pipe, a pressurized gas injection pipe, a slime discharge pipe,
With a built-in fresh water injection pipe and / or air injection pipe,
In a hardener injection rod having a monitor part, a rod body part excavating bit, an excavating blade bit, and an excavating blade, a mud exhaust blade is provided, and a slime suction hole that can be opened and closed is provided in the exhaust mud blade.
It is made provided to provide a soil improvement material reclamation device comprising a. In addition, hardener injection pipe, pressurized gas injection pipe, slide
Built-in exhaust pipe, fresh water injection pipe and / or air injection pipe
In addition, monitor part, rod body excavation bit, excavation
Using a hardener injection rod with wing bits and drilling wings
During the construction method, the gas at the tip of the excavation blade was wrapped with pressurized gas
The curing agent was rotated and sprayed while being combined, and it was installed in the mud blade.
Slime was inhaled through the slime suction port and
The upper or lower side by the jet force of fresh water and / or air.
Push it up in the discharge direction, and then use the slime discharge pipe to
Ground improvement body construction work characterized by discharging the soil to the outside
Provide the law.

[0005]

As a result of adopting the above means, it is possible to surely make the soil mud pressure uniform by smooth discharge of slime at the time of excavation, and to make a better ground improvement body.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing an implementation situation of an embodiment according to the present invention. That is, the hardening agent injection pipe 1
1, a pressurized gas injection pipe 12, a slime discharge pipe 13, a fresh water injection pipe 14 and an air injection pipe 15, and an excavation blade 16 having a bit 17 below the main body, and a monitor 22 and excavation further below the excavation blade 16. In the hardening agent injecting rod 10 provided with the working bit 23, the drainage blade 2 is provided above the excavation blade 16.
The ground improvement body construction apparatus which provided 0 is shown. here,
The drainage blade 20 is surrounded by the pressurized gas jetted from the peripheral nozzle 19 at the tip of the excavation blade 16 above the excavation blade 16, and is suitable for not inhaling the hardening agent jetted at high pressure from the nuclear nozzle 18. It must be installed at the height. Further, in the present embodiment, the sludge removal blade 20 is formed such that one of its side ends is relatively thick and the other is relatively thin, and a slime suction hole 21 which can be opened and closed is provided at the side end. At the same time, a slime suction hole 21 that can be opened and closed is also provided at the tip of the sludge discharge blade 20. Of course, this slime suction hole 21 may be provided only at one of the side end portion and the tip end portion, and the size and number of the slime suction hole 21 can be freely provided.

In this structure, the slime suction hole 21 at the side end of the sludge discharge blade 20 is provided in the rotation direction of the rod 10. Of course, it is also possible to provide the suction holes 21 in the reverse direction, but it is desirable to provide the suction holes 21 in the rotation direction of the rod in the ground because the slime suction force can be further enhanced. Accordingly, in combination with the openable and closable structure (not shown), smooth slime intake can be performed while easily adjusting according to the condition of the excavated ground, the slime generation amount, and the like. The slime hole 21 may be provided at an appropriate position above the hardener injection rod body 10 itself, that is, above the excavation blade 16, but such an embodiment has already been applied for.

In the present invention in which the slime suction hole 21 is provided in the excavation blade 16, the slime can be smoothly sucked in and discharged, and the mud pressure in the ground can be made smoother than in the case where the slime suction hole 21 is provided at only one place in the rod body 10. It can be made uniform.
In this case, since there is a distance to the slime discharge pipe 13 communicating with the inside of the rod, it may take longer time to discharge than the case where the slime suction hole 21 is provided in the rod body portion 10. This problem can be solved by increasing the suction power of slime. That is, according to FIG. 1, in addition to the curing agent injection pipe 11, a fresh water injection pipe 14 and an air injection pipe 1
5 is provided in the rod body 10, and the sludge removal blade 2 is further provided.
The slime discharge pipe 13 communicating from 0 to the upper part of the rod main body is mixed with air in order to strongly push the sucked slime upward in the discharge direction at the bent portion of the joint (root) of the mud blade 20. By high-pressure injecting the produced fresh water from an injection port (not shown) provided in the lower portion of the bent portion, the slime is softened and the discharge force is enhanced, so that the muddy water can be smoothly discharged. Further, it is not always necessary to inject the fresh water and the air at the same time, and in some cases, it is possible to inject only the fresh water or only the air. This is because each injection pipe is independent and independent. On the other hand, in order to smoothly discharge the slime, it is of course possible to install a suction motor on the ground.

By using the apparatus of the present invention having the above-mentioned structure, the excavating blade 16 is provided at the improved body forming position.
While rotating and excavating with the excavating blade bit 17 provided at the side end portion of the excavating blade, high-pressure injection of the hardener encapsulated with the pressurized gas is started from the nozzle portions 18 and 19 at the tip of the excavating blade 16 to inject the injection rod. Combined with the rotation, rocking and pulling up of 10, the mud blade 2
Intake slime from the slime suction hole 21 provided in 0,
Further, the jet injection force of Shimizu or / and air smoothly discharges the slime from the slime discharge pipe 13, thereby discharging the mud water which is the surplus water, and performing the ground preparation while keeping the mud pressure in the ground substantially constant. .

2A and 2B are sectional views of the hardener injection rod 10 in one embodiment of the present invention. That is, it shows the configuration of various tubes built in the injection rod 10. Here, (A) has a configuration in which the slime discharge pipe 13, the fresh water injection pipe 14, and the air injection pipe 15 are concentrically configured, while (B) shows the three types of pipes, each of which is a single unit. The configuration as a tube is shown. These can be appropriately selected depending on the geology, depth, etc. of the ground to be excavated, and by extension, the degree and amount of the slime.

[0011]

EFFECTS OF THE INVENTION According to the present invention, slime during excavation can be discharged to the outside more smoothly, so that the soil mud pressure can be made uniform, and an excellent ground improvement body having a large diameter and uniform strength can be constructed. It will be possible.

[0012]

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment of the present invention.

FIG. 2 (A) is a cross-sectional view of a hardener injection rod in one embodiment of the present invention.

FIG. 2B is a cross-sectional view of a hardener injection rod according to another embodiment of the present invention.

[Explanation of symbols]

 10 Curing Agent Injection Rod 11 Curing Agent Injection Pipe 12 Pressurized Gas Injection Pipe 13 Slime Discharge Pipe 14 Fresh Water Injection Pipe 15 Air Injection Pipe 16 Drilling Blade 17 Drilling Blade Bit 18 Nuclear Nozzle 19 Surrounding Nozzle 20 Exhaust Mud Blade 21 Slime Intake Hole 22 Monitor part 23 Rod body excavating bit

Claims (3)

[Claims] 1. Hardener injection pipe (11), pressurized gas injection pipe (12), slime discharge pipe (13), fresh water injection pipe (1)
4) or / and a built-in air injection pipe (15), a monitor part (22), a rod body excavating bit (2)
3), in a hardener injection rod (10) having a drilling blade bit (17) and a drilling blade (16), a mud blade (20)
And has a slime suction hole in the drainage blade (20).
A ground improvement body constructing device characterized by being provided . 2. A ground improvement body constructing device, wherein the slime suction hole (21) of claim 1 is installed so as to be openable and closable. 3. A hardening agent injection pipe (11), a pressurized gas injection pipe (12), a slime discharge pipe (13), and a fresh water injection pipe (1).
4) Incorporating the or / and air injection pipe (15),
Monitor part (22), rod body excavating bit (2
3), a method of using a hardening agent injection rod (10) having an excavation blade bit (17) and an excavation blade (16), in which a curing agent is rotationally jetted while being encapsulated by a pressurized gas from a nozzle portion at the tip of the excavation blade. At the same time, the slime is sucked from the slime suction hole (21) provided in the sludge discharge blade (20), and the sucked slime is pushed upward by the fresh water or / and the jetting force of the air in the discharge direction, and further, the slime discharge pipe. The ground improvement body construction method, wherein the slime is discharged from (13).