JP2937661B2 - Grout injection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grouting method with improved construction efficiency.

[0002]

2. Description of the Related Art There has been a remarkable improvement in grouting methods in recent years. Typical examples are the instantaneous injection method and the so-called composite injection method in which both a slow setting grout having a long setting time and a quick setting grout having a short setting time are injected.

[0003] The idea of the composite injection method is to improve the ground only within the target area without allowing the grout material to escape to the ground surface or out of the target area, and to combine the vein injection and the osmotic injection into the object. The aim is to improve the ground area without fail. On the other hand, in recent years, in this type of grouting method, a drilling injection rod having a drilling bit at the tip is often used as an injection pipe as it is. In particular, in the composite grout injection method, a double pipe composite injection method using an outer tube as a drilled rod is also performed. In this case, the drilling is performed while applying a pushing force and a rotational force to the drilling injection rod and supplying drilling water into the drilling injection rod. Then, after the drilling is completed, the grout material plant is operated to perform the injection, and finally, when the injection at a certain location is completed, a drilling rod installation machine (drilling drill) is provided at the next location. Holding the injection rod, moving a machine that applies a pushing force and a rotational force), and repeatedly starting drilling at that location is repeated.

[0004] On the other hand, in the injection method using a double pipe double packer system represented by the so-called soretanche injection method, a casing is erected using a rotary percussion drill, a seal (sleeve) grout is injected, and a vinyl chloride pipe or the like is injected. A plastic pipe to be the outer pipe for injection is built in the casing, and only the casing is removed, the seal grout is cured, the inner pipe is inserted, and the primary injection with cement bentonite material is performed. It adopts a configuration in which water glass grout is injected at each stage while stepping up only the pipe.

[0005]

However, although the machine for installing a drilling rod is advantageous in that it is relatively small,

[0006] The drilling ability is not large. In particular, for a gravel layer, the drilling speed drops sharply. Therefore, the required boring time occupies a large proportion of the entire pouring operation, which causes a reduction in the overall construction efficiency.

[0007] On the other hand, when the drilling injection rod is merely installed in the ground, grout often flows to the ground from between the drilling injection rod and the drilling hole wall. Therefore, prior to the injection, the instantaneous grout is injected from the drilling injection rod to prevent the outflow of the grout.However, the instantaneous grout is injected for each stage. Is a factor that significantly reduces construction efficiency.

Further, in the so-called soletanche pouring method described above, a casing is erected using a rotary percussion drill. However, this casing is erected because a plastic pipe as an outer tubing is erected. There is no idea that the casing will be used as an injection pipe. In addition, this method has a disadvantage that the number of steps is extremely large and workability is inferior.

[0009] Therefore, an object of the present invention is to improve the overall work efficiency.

[0010]

The object of the present invention is to provide a rotary percussion drill in which a casing is erected in advance at a target ground location, an injection pipe is inserted into the casing, and a casing is provided between the outer surface of the casing and the hole wall and the casing. in a state of flowing out by the action of outflow preventing means for preventing the between gap to the ground grout between the inner surface and the injection tube outer surface, injecting grout through the said injection tube, and the
Grout through the gap between the inner surface of the casing and the outer surface of the injection pipe
Injection is not performed, and when this injection is completed, both the casing and the injection pipe are pulled up to a predetermined length, and injection is performed in the stage that has been pulled up. Outflow prevention means is constituted by injecting instantaneous setting grout after the casing is erected, and the casing inner surface and the injection pipe outer surface are
The means for preventing the gap from flowing out is provided with an injection pipe into the casing.
After the insertion, the caking material is injected directly into the gap.
This problem can be solved by improving the composite injection by injecting the loosening grout after the injection of the instantaneous setting grout in each stage or in each stage.

[0011]

According to the present invention, unlike the conventional installation machine dedicated to the drilling rod, the casing is drilled by rotary percussion, so that the drilling speed is greatly increased. In addition, even a gravel layer can be drilled quickly.

In addition, since the rotary percussion drilling machine has a high drilling speed, drilling can be performed at a large number of locations in advance, and grouting can be set up during that time, and at each position, grouting can be performed. The injection can be performed while the plant for the material is running continuously without shutting down. Therefore, the construction efficiency is extremely high.

On the other hand, in the conventional composite grout injection, since it is necessary to inject the instantaneous connection and the loose connection and to switch between them, it is necessary to consider that the advanced device (monitor) has a complicated structure. Has been forced. In particular, the relationship between the outer tube and the inner tube is structurally complicated. Therefore, it cannot be built by applying a shock to them in the state of their combination. In addition, the complexity of the advanced device not only increases the cost, but also causes clogging of the grout material and lowers the maintainability.

On the other hand, in the present invention, a casing tube is built by a rotary percussion drill, and this is used as an outer injection tube. By feeding each liquid for binding grout to each injection inner tube and joining them at the tip, a grout for instant binding can be formed. In addition, since the injection inner pipe does not need to consider the strength at the time of drilling as in the related art, for example, a plastic pipe or a hose is sufficient.

Further, as described above, when grout is injected, it is necessary to prevent the grout material from flowing out to the ground. As the outflow preventing section, for between the casing and its like an anchor hole wall, by injecting Madokayui grout, and for between gap between the casing and the injection tube,
Direct filling of the caking material (ie
Immediate injection refers to the solidification inside a bag or the like placed in the gap.
Includes injecting and inflating caking material into a packer
Can be provided by no).

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

First, FIG.
The rotary force and the impact force are given to the casing 2 to a predetermined depth by the rotary percussion drill 1 shown in
As shown in FIG. 2, after digging the casing and then digging the casing, the injection pipe 3 is inserted into the casing 2. In this case, at the same time as digging the casing, the injection pipe 3
Can also be inserted. Reference numeral 4 denotes an outer surface of the distal end portion of the injection pipe 3 integrated with a gap between the outer surface of the distal end portion and the inner surface of the casing 2.
It is a packer that closes (details will be described later) .

Thereafter, as shown in FIG. 3, for example, the main agent and the curing agent of the two-liquid curable grout G are supplied via a swivel 5 and mixed and mixed at the tip of the injection pipe 3 while the injection pipe is being mixed. Injection grout Gs is injected from the injection port at the tip of No. 3. By the injection of the instantaneous grout Gs, the gap between the outer surface of the casing 2 and the wall of the installation hole is filled and sealed, and the instantaneous grout Gs is injected into the ground near the injection port.

Next, at this stage, the loose grout GL is injected. This loose grout GL is infused into the improved part of the flash grout Gs and through it to the surroundings.

Thereafter, as shown in FIG.
And the injection tube 3 is simultaneously stepped up by a predetermined length.
In this stepped-up upper stage, flash grout Gs and then loose grout GL are injected from the injection port at the tip of the injection tube 3. After that, step-up and injection are repeated to improve the ground in a certain depth range.

In this example, in each stage, the quick-setting grout Gs and the slow-setting grout GL are injected. After the quick-setting grout Gs is injected, the casing 2 and the injection pipe 3 are connected. Injection for each stage may be performed by stepping up by a predetermined length and injecting the loose grout GL at that position.

In the above example, the tip of the injection pipe 3 is substantially the same as the tip of the casing 2. However, as shown in FIG. 5, the injection is performed with the tip of the injection pipe 3 discharged from the tip of the casing 2. Can also. In this case, after inserting the injection pipe 3 into the casing 2, the casing 2 can be pulled up by a certain length.

On the other hand, the inner surface of the casing 2 and the outer surface of the injection pipe 3
In the present invention, the packer 4 that closes the gap
It can be provided by directly injecting the consolidation material into the gap
it can. For example, as shown in FIG. 6, a spout 3a is formed at the base side of the injection pipe 3, and a sealing material such as a bentonite-cement type or a water glass-hardener type sealing material is poured out from the spout 3a. What is necessary is just to fill the gap between the outer surface of the injection pipe 3 and the inner surface of the casing 2.

On the other hand, in the present invention, as shown in FIG.
As in the above example, one injection pipe
Instead of two injection inner tubes 3A and 3B
For example, add each solution (solution A and solution B)
To feed the inner pipes 3A and 3B and join them at the tip
As a result, a flash grout can be formed. Only
In addition, the injection inner tube has the same strength as
Since there is no need to consider it, for example,
Insufficient or inexpensive tubes, such as ginger, are sufficient.
In the embodiment shown in FIG. 8, each inner injection tube 3A, 3B is discharged.
After issuing, ground while mixing A solution it and B solution is to merge
Injected inside.

[0025] In the present invention, it is understood from each of the above examples.
As described above, the casing 2 is used as a liquid passage for the injection material.
Absent. That is, as shown in FIG.
Used as a liquid feed path for the input material, part of the injection pipe,
For example, at the base of the casing 2 built in the ground,
A body 10 is provided, through which a two-part curable grout A liquid
And the solution B is fed into the injection pipe 3 consisting of a single pipe.
Formed in the board or at the tip of the injection tube 3 as shown
Discharge to the side from the discharge port and mix and mix with liquid A,
Injecting into the ground is not included in the present invention.

[0026]

As described above, according to the present invention, the casing can be dug by the rotary percussion drill, and the injection pipe can be erected using the casing, so that the work efficiency is improved. Benefits are brought.

[Brief description of the drawings]

FIG. 1 is a schematic view of a rotary percussion drill used in the method of the present invention.

FIG. 2 is a schematic view of an installation state of a casing.

FIG. 3 is a schematic view of an injection state.

FIG. 4 is a schematic view of an injection state in an upper stage.

FIG. 5 is a schematic diagram showing an injection state in a different mode.

FIG. 6 is a schematic diagram of a specific example using a caking material as a packer.

FIG. 7 is a schematic vertical sectional view of another example.

FIG. 8 is a schematic longitudinal sectional view of another embodiment.

[Explanation of symbols]

1. High-speed rotary percussion drill, 2. Casing (outer injection tube), 3, 3A, 3B. Injection tube (inner injection tube), 4. Packer , G. Grout.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Naoki Yamamoto, Inventor 2-2-11 Minamisuna, Koto-ku, Tokyo (72) Inventor Yasuo Miyazaki 2-16-6, Oimazato Minami, Higashi-Nari-ku, Osaka-shi, Osaka (72) Invention Person Yasunori Sato 8-11 Nadainmachi, Tennoji-ku, Osaka-shi, Osaka (56) References JP-A-4-14514 (JP, A) JP-A-2-112518 (JP, A) JP-A-4-76109 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 3/12 101

Claims (1)

(57) [Claims] 1. A casing is preliminarily erected by a rotary percussion drill at a target ground location, and an injection pipe is inserted into the casing. The injection pipe is inserted between the outer surface of the casing and the hole wall, and between the inner surface of the casing and the injection pipe. in a state where the outflow preventing section is allowed to act to prevent the outflow of the ground grout between gap the outer surface, injecting grout through the said injection tube, and the casing inner surface and Notes
Grout injection was not performed through the gap with the outer surface of the inlet pipe, and when this injection was completed, both the casing and the injection pipe were raised by a predetermined length, and injection was performed at the stage where the pipe was lifted, and the pulling and injection were repeated. The outflow preventing means between the casing and the hole wall is constituted by injecting instantaneous grout after the casing has been erected, and the flow in the gap between the inner surface of the casing and the outer surface of the injection pipe is provided.
The outflow preventing means is provided after the injection pipe is inserted into the casing.
Then, the caking material is directly injected into the gap, filled and solidified.
A grout injection method , wherein each step or within each stage is improved by a composite injection in which a quick-setting grout is injected after a quick-setting grout is injected.