JPH0853855A - Drilling device and method for placing continuous wall - Google Patents

Abstract

(57) [Abstract] [Purpose] Continuous wall casting that does not cause unevenness in strength and waste of the curing liquid in the continuous wall formed by being able to uniformly knead the body to be excavated and the curing liquid. A drilling device and a drilling method are provided. [Structure] The ground is continuously excavated with an auger device, and the hardening liquid is discharged from the hardening liquid discharge port provided at the tip of the auger shaft, and the auger screw is used to stir the material to be excavated for hardening. In a continuous wall body excavating device for placing a continuous wall body therein, a hardening liquid discharge port is provided near the upper end of the auger screw, and when the auger shaft descends, the hardening liquid discharge port is provided at the tip of the auger shaft. The curing liquid is discharged from the curing liquid discharge port, and when the auger shaft is raised, the curing liquid is discharged from the curing liquid discharge port provided at the upper end of the auger screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous wall body driving excavation device and method for continuously excavating the ground and driving a continuous wall body in the ground.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. 1, which is an embodiment of the present invention. 1 (a) and 1 (b) are external views of an auger device as a continuous wall driving excavator according to the present invention for excavating the ground and driving a continuous wall into the ground. FIG. 1A is a front view, and FIG. 1B is a right side view thereof. In this auger device 1, an auger 3 is attached to a leader 2 suspended from a boom (not shown) so as to be able to move up and down, and in this example, three auger shafts 4a, 4b and 4c are attached in a straight line in this example. However, some of them are uniaxial, and there are also cases where two, four or more auger shafts are provided. In order to excavate the ground with the auger device 1 as described above, the auger 3 is used to form the auger shafts 4a and 4a.
b, 4c are rotated, and this rotating auger shaft 4
auger head 5 attached to the tip of a, 4b, 4c
The ground (not shown) is excavated at a, 5b, and 5c.

During this excavation, the lower curing liquid discharge port 6a,
6c, the curing liquid is discharged from the auger shafts 4a, 4b,
Auger screws 7a, 7 rotated by rotation of 4c
The continuous wall body is placed in the ground by stirring with an object to be excavated such as earth and sand excavated in b and 7c and hardening it.

[0004]

In excavating and stirring the ground for driving such a continuous wall body, first, the auger shafts 4a, 4b, 4c are rotated, and the tip end of the auger shaft 4b is removed. While supplying the air for facilitating the excavation and discharging the curable liquid from the lower curable liquid discharge ports 6a and 6c, as shown in the graph of FIG. ) Point to a deepest point (a) at a predetermined distance, and then the auger heads 5a, 5b, 5c are pulled up from this deepest point (a) to an intermediate point (c), and the deepest point (a) By excavating the auger heads 4a, 4b, 4c to the point d) and finally returning the auger heads 5a, 5b, 5c to the point (e) on the ground surface, excavation and stirring of this portion are completed. The number of times of raising and lowering of the auger shafts 4a, 4b, 4c for this stirring is appropriately adjusted according to the condition of the ground. By performing such excavation and stirring sequentially and continuously at different locations, a continuous wall body is placed in the ground.

As described above, in the prior art, the curing liquid was discharged only from the tip of the auger shaft. Therefore, for example, in FIG. 6, the auger shafts 4a and 4b start from the deepest points (a) and (d). , 4c is pulled up, the discharged curing liquid remains unstirred, so that there is a drawback that the excavated body such as earth and sand and the curing liquid are not uniformly kneaded.

The present invention was devised in view of such problems, and a continuous wall body formed by being able to uniformly knead an excavated body such as earth and sand and a hardening liquid in terms of strength. It is an object of the present invention to provide an excavating device for a continuous wall body and an excavating method in which unevenness does not occur and a curing liquid is not discharged unnecessarily.

Further, in the case of excavating the ground, for example, in an example of excavating using an auger device having the above-mentioned three-axis auger shaft, as shown in FIG. There is a case where the procedure is performed by excavating a portion with a space (3b portion) for one axis and finally excavating the portion using the already excavated holes 1a and 2c as guide holes. In addition to this, for example, the excavation hole at the end of the triaxial excavation hole, for example, the excavation hole 1a is used as a guide hole for new excavation, and the guide hole is excavated twice by sequentially excavating the guide hole twice. When going (,,
Will be excavated in that order).

In any of the excavation procedures, when excavating with an auger device having three auger shafts, for example, in the case of excavating in the above order, when excavating a part, the excavation hole of the part is excavated. May be slightly hardened, so that only the 1a, 3b, and 2c parts are agitated when excavating the parts, and they are adjacent to each other.
Since only the overlapping 1d and 2d portions (hatched portions) are agitated in the portion, a partition wall is formed in the overlapping 1d and 2d portions, and there is a problem in water stopping of this portion. May occur.

The present invention was devised in view of the above problems, and when excavating the ground by an auger device having at least two axes to drive a continuous wall body, the excavation hole and the excavation hole are formed. It is an object of the present invention to provide an excavating device for placing a continuous wall body, which has good water-stopping properties in the portions where and overlap.

[0010]

In order to achieve the above object, an auger screw is used to continuously excavate the ground by an auger device and to discharge a hardening liquid from a hardening liquid discharge port provided at the tip of an auger shaft. In the excavation device for placing a continuous wall body in the ground by stirring and hardening it with the body to be excavated, at a predetermined distance above the hardening liquid discharge port at the tip of the auger shaft. The configuration is such that a hardening liquid discharge port is provided at the position.

Further, the ground is continuously excavated by an auger device having at least two auger shafts, and the hardening liquid is discharged from a hardening liquid discharge port provided at the tip of the auger shaft to be excavated by an auger screw. In an excavating device for placing a continuous wall body in the ground by stirring with the body to cure the solid wall, the curing liquid is discharged from the tip of the auger shaft at a position intermediate between adjacent auger shafts. The curing liquid discharge port is provided at a position separated by a predetermined distance above the outlet.

Further, the ground is continuously excavated by an auger device having at least two auger shafts, and the hardening liquid is discharged from a hardening liquid discharge port provided at the tip of the auger shaft to be excavated by an auger screw. In a continuous wall body excavating device for placing a continuous wall body in the ground by agitating with the body and hardening, the hardening liquid at the tip of the auger shaft located outside each auger shaft on both sides. The curing liquid discharge port is provided at a position separated by a predetermined distance above the discharge port, and the curing liquid discharge port provided at a position separated by a predetermined distance from the curing liquid discharge port at the tip of the auger shaft, Each of them is arranged obliquely downward and outward.

Further, the ground is continuously excavated by an auger device, and the hardening liquid is discharged from a hardening liquid discharge port provided at a position separated by a predetermined distance from the auger shaft end and the auger shaft. A method for placing a continuous wall body in the ground by stirring and hardening the excavated body with a screw, when stirring the hardening liquid and the excavated body with an auger screw. , When the auger shaft is lowered, the hardening liquid is discharged from the hardening liquid discharge port arranged at the tip of the auger shaft, and when the auger shaft is raised, the hardening liquid is provided at a position a predetermined distance above the tip of the auger shaft. The curable liquid is discharged from the curable liquid discharge port.

[0014]

[Operation] The operation of the present invention is as follows. Claim 1
According to the third aspect, since the hardening liquid is discharged from the hardening liquid discharge port provided at a position separated by a predetermined distance above the tip of the auger shaft, the hardening liquid is uniformly mixed with the excavated body such as earth and sand. Kneaded. Further, according to the fourth aspect, the hardening liquid is discharged toward a portion where the drill hole and the drill hole overlap. Further, according to claim 5, when stirring with the auger screw, the hardening liquid is discharged from the upper hardening liquid discharge port when the auger shaft is raised, and the hardening liquid is discharged from the lower hardening liquid discharge port when the auger shaft is lowered. As a result, the excavated body such as earth and sand and the curing liquid are uniformly kneaded, and the curing liquid is not wastefully discharged.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 (a) is a front view of an auger device 1 as a continuous wall body placing excavator according to the first embodiment, and FIG. 1 (b) is a right side view thereof. FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. Although FIG. 1 explains the main points in the description of the conventional technique, this embodiment includes three auger shafts 4a, 4b, and 4c,
The auger shafts 4a, 4b, 4c are connected to the auger 3 at the upper portion thereof, and the auger 3 is actuated to impart a rotational force for excavation and stirring to the auger shafts 4a, 4b, 4c. It has become so.

Further, the auger shafts 4a, 4b, 4
c is rotatably supported by the upper connection bearing 8 and the lower connection bearing 10. That is, A-A in FIG.
As shown in FIG.
a, 4b, and 4c are bushes 9a, 9b, and 9c, respectively.
The front connection bearing 8a and the rear connection bearing 8b each having the same are sandwiched and connected in a sandwich shape. 11a, 1
Reference numeral 1c denotes a curing liquid supply pipe for receiving a supply of a curing liquid from a curing liquid supply plant (not shown), and reference numeral 11b denotes an air supply pipe for receiving a supply of air from an air supply plant (not shown). The lower connecting bearing 10 has a similar structure.

The hardening liquid supplied through the hardening liquid supply pipes 11a and 11c is the lower hardening liquid discharge ports 6a and 6c (see FIG. 1).
(See reference). Similarly, the air supply pipe 11b
Is supplied from the air supply port 6b. In addition, the auger shaft 1 is provided in the auger device 1.
a, 4b, 4c are adjacent to each other, and are separated from the lower curable liquid discharge ports 6a, 6c by a predetermined distance, and near the upper ends of the auger screws 7a, 7b, 7c. 12a and 12b are provided. 13a and 13b are hardening liquid supply pipes therefor,
14a and 14b are hoses connected to a hardening liquid supply plant (not shown).

As described above, by providing the hardening liquid discharge ports at the respective intermediate portions of the adjacent auger shafts, as shown in FIG. 7B, the excavation holes 3b 'to which air is supplied.
Since the hardening liquid discharge ports 6a 'and 6c' are located at the portions and the hardening liquid is discharged to the excavation hole portion to which this air is supplied, the discharged hardening liquid and the excavated body such as earth and sand are agitated. ， Kneading can be performed more reliably.

In the auger device 1 as the excavating device for driving a continuous wall constructed as described above, first, the ground at a predetermined location is excavated by the auger heads 5a, 5b and 5c. While supplying the curing liquid supplied from the curing liquid supply plant not shown through the lower curing liquid discharge ports 6a and 6c and the air supplied from the air supply plant (not shown) through the air supply port 6b, the auger shaft 4
The auger screws 7a, 7b, 7c rotated by the rotation of a, 4b, 4c stir the excavated body such as earth and sand, the discharged hardening liquid and the supplied air. In this state, the auger heads 5a, 5b, 5c are advanced from the ground surface (a) point to the deepest part (a) point (see FIG. 6). Then
The auger heads 5a, 5b, 5c are pulled up from the deepest point (a) to the intermediate point (c). At this time, the auger heads 5a, 5b, 5c are pulled up from the lower hardening fluid discharge ports 6a, 6c by a hardening fluid supply plant not shown. The discharge of the hardening liquid is stopped and the hardening liquid is discharged from the upper hardening liquid discharge ports 12a and 12b.

Next, the auger heads 5a, 5b, 5c
Is again lowered to the deepest point (d), but at this time, by the curing liquid supply plant (not shown),
The discharge of the hardening liquid from the upper hardening liquid discharge ports 12a and 12b is stopped and the hardening liquid is discharged from the lower hardening liquid discharge ports 5a and 5c, and the discharged hardening liquid and the earth and sand are discharged by the auger screws 7a, 7b and 7c. The auger heads 5a, 5b, 5c are lowered while stirring the excavated object such as. further,
By a curing liquid supply plant (not shown), the discharge of the curing liquid from the lower curing liquid discharge ports 6a and 6c is stopped and the curing liquid is discharged from the upper curing liquid discharge ports 12a and 12b, and the auger screws 7a, 7b and 7c are used. The positions of the auger heads 5a, 5b, 5c are raised to the ground surface (e) point while stirring the excavated body such as earth and sand and the hardening liquid. Drilling,
The stirring is completed. In addition, depending on the condition of the ground, etc., when the auger heads 5a, 5b, 5c are both raised and lowered, the curing liquid is discharged from both the lower curing liquid discharge ports 6a, 6c and the upper curing liquid discharge ports 12a, 12b. Sometimes excavation is performed.

In this way, the auger head 5 is used for stirring.
When lowering the positions of a, 5b and 5c, the curable liquid is ejected from the lower curable liquid ejection ports 6a and 6c, and conversely, when it is raised, the curable liquid is ejected from the upper curable liquid ejection ports 12a and 12b. The stirrer uniformly stirs and kneads the hardening liquid and the excavated body such as earth and sand, and at the same time, the auger head 5
When the a, 5b, and 5c are pulled up, the hardening liquid is not left unmixed with the object to be excavated such as earth and sand.

Next, a second embodiment of the present invention will be described. FIG. 3 (a) is a front view of an auger device 1'as a continuous wall body placing excavator according to a second embodiment of the present invention.
(B) is a right side view. Further, FIG. 4 is shown in FIG.
FIG. 7 is a sectional view taken along line AA of FIG. In the second embodiment, the upper hardening liquid outlet 12a in the first embodiment,
The mounting position of 12b (12a ', 12b' in FIG. 3) is on both outer sides of the triaxial auger shafts 4a, 4b, 4c, and is separated by a predetermined distance from the lower curing liquid discharge ports 6a, 6c. The difference from the first embodiment is that the auger screws 7a and 7c are arranged near the upper ends. The rest of the configuration, operation and procedure are the same as in the first embodiment described above and will not be described.

Next, a third embodiment of the present invention will be described. FIG. 5 (a) is a front view of an auger device 1 ″ as an excavating device for placing a continuous wall body according to a third embodiment of the present invention.
(B) is the right view. In the third embodiment, on both outer sides of the auger shafts 4a, 4c located on both sides of the triaxial auger shafts 4a, 4b, 4c,
In the vicinity of the upper ends of the auger screws 7a, 7c, which are spaced a predetermined distance upward from the lower curing liquid discharge ports 6a, 6c,
The upper hardening liquid discharge ports 12a "and 12b" are provided in the same manner as in the second embodiment, but the upper hardening liquid discharge port 1 is provided.
The second embodiment differs from the second embodiment in that 2a "and 12b" are arranged obliquely downward and outward.

That is, in the upper curing liquid discharge ports 12a ', 12b' of the second embodiment, the curing liquid is discharged substantially right below (see FIG. 3), while in the third embodiment. The curable liquid is discharged obliquely downward and outward. By configuring in this way, for example,
In FIG. 7 (b) showing the excavation procedure, as described above, the curing liquid is intensively discharged to the overlapping portions (the portions shown by diagonal lines) of 1d and 2d where partition walls are formed and water blocking is a problem. Therefore, it is possible to prevent the water blocking property of this portion from becoming poor. Other configurations, operations, and procedures are the same as those in the first and second embodiments, and description thereof will be omitted.

[0025]

As described above, according to the present invention, the hardening liquid discharge port is also provided at the upper end of the auger screw, and
When stirring with the auger screw, the curing liquid is discharged from the upper curing liquid discharge port when the auger shaft rises, and the curing liquid is discharged from the lower curing liquid discharge port when the auger shaft descends. It is possible to uniformly knead the object to be excavated and the hardening liquid, so that there is no unevenness in the strength of the formed continuous wall, and the hardening liquid to be discharged is not wasted. The excavating device and the excavating method can be used.

Further, since the hardening liquid is discharged toward the portion where the excavation hole and the excavation hole overlap, a continuous wall body having good water stopping property at the overlap portion between the excavation hole and the excavation hole is placed. It is possible to realize an excavating device for driving a continuous wall body.

[Brief description of drawings]

FIG. 1 (a) is a front view of an auger device as an excavating device for placing a continuous wall body according to a first embodiment, and FIG. 1 (b) is a right side view.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 (a) is a front view of an auger device as a continuous wall body driving excavator according to a second embodiment, and FIG. 3 (b) is a right side view thereof.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 (a) is a front view of an auger device as a continuous wall body placing excavation device according to a third embodiment, and FIG. 5 (b) is a right side view thereof.

FIG. 6 is a graph showing the relationship between the depth of excavation and agitation and time.

FIG. 7 (a) is a diagram for explaining the effect of the first embodiment, and FIG. 7 (b) shows a procedure for excavating the ground by an auger device equipped with three auger shafts and a problem. It is a figure for demonstrating a point.

[Explanation of symbols]

 1, 1 ', 1 "· Auger device 2 · · Reader 3 · · Auger 4a, 4b, 4c · Auger shaft 5a, 5b, 5c · Auger head 6a, 6c · Curing liquid discharge port 6b · Air supply port 7a, 7b , 7c, auger screw 11a, 11a ", 11b, 11b", hardening liquid supply pipe 12a, 12a ', 12a ", hardening liquid discharge port

Claims (5)

[Claims] 1. A method for continuously excavating the ground by an auger device and discharging a hardening liquid from a hardening liquid discharge port provided at the tip of an auger shaft and stirring the hardening liquid with an auger screw to harden the material to be excavated. In the excavating device for placing a continuous wall body in the ground by the method, a hardening liquid discharge port is provided at a position separated by a predetermined distance from the hardening liquid discharge port at the tip of the auger shaft. An excavation device for placing continuous walls. 2. The ground is continuously excavated by an auger device having at least two auger shafts, and the hardening liquid is discharged from a hardening liquid discharge port provided at the tip of the auger shaft to be excavated by an auger screw. In a continuous wall body excavating device for placing a continuous wall body in the ground by agitating with the body and hardening, the curing liquid discharge of the auger shaft tip located at the middle of each adjacent auger shaft. An excavating device for placing a continuous wall body, characterized in that a hardening liquid discharge port is provided at a position separated by a predetermined distance above the exit. 3. The ground is continuously excavated by an auger device having at least two auger shafts, and the hardening liquid is discharged from a hardening liquid discharge port provided at the tip of the auger shaft to be excavated by an auger screw. In a continuous wall body excavating device for placing a continuous wall body in the ground by stirring with the body and hardening, the hardening liquid at the tip of the auger shaft located outside each auger shaft on both sides. An excavating device for placing a continuous wall, wherein a hardening liquid discharge port is provided at a position separated by a predetermined distance above the discharge port. 4. The hardening liquid discharge port according to claim 3, wherein the hardening liquid discharge port is provided at a position separated by a predetermined distance above the hardening liquid discharge port at the tip of the auger shaft, and is arranged obliquely downward and outward. The excavation device for placing a continuous wall body according to claim 3, wherein 5. The auger is used to continuously excavate the ground, and the hardening liquid is discharged from a hardening liquid discharge port provided at a position separated from the tip of the auger shaft by a predetermined distance above the end of the auger shaft. A method for placing a continuous wall body in the ground by stirring and hardening the excavated body with a screw, when stirring the hardening liquid and the excavated body with an auger screw. , When the auger shaft is lowered, the hardening liquid is discharged from the hardening liquid discharge port arranged at the tip of the auger shaft, and when the auger shaft is raised, the hardening liquid is provided at a position a predetermined distance above the tip of the auger shaft. A method for excavating a continuous wall body, characterized in that the hardening liquid is discharged from a hardening liquid discharge port.