JP2505977B2 - Method of forming underground continuous wall - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for forming an underground continuous wall.

[0002]

2. Description of the Related Art Conventionally, a method of forming a continuous underground wall using a multi-axis excavator is known. For example, in the method for forming a continuous underground wall known from Japanese Patent Publication No. 62-54929, first, a multi-axis excavator is used to form a first hole in which excavation round holes are continuously connected to the ground in a bead-like shape. The second hole is formed by leaving the uncut portion on the extension line of the first hole, and then the uncut portion between the first hole and the second hole is excavated. The excavation round holes located at each end of the first and second holes are used as guide holes to insert the excavation shafts located on both sides of the multi-axis excavator, and the unexposed portion is excavated by the central excavation shaft. .

[0003]

However, in the above-mentioned conventional example, the lateral length of the uncut portion between the first hole and the second hole is determined by the distance between the excavating shafts at both ends of the multi-spindle excavator. It is shorter than the distance, that is, the lateral length that can be excavated by the central excavation axis, and therefore, in the conventional method, since the lateral length of the uncut portion is short, the underground wall of the required lateral length is formed. However, there was a problem that the number of excavations increased, and the construction time was long.

The present invention has been made in view of the above-mentioned problems of the conventional example, and its purpose is to obtain the lateral length of the uncut portion, that is, the first hole and the second hole. The distance between the first hole and the second hole can be made the same as the horizontal length, and when excavating the uncut portion, the uncut portion is surely excavated by the excavation device to make the first hole and the second hole. It is an object of the present invention to provide a method for forming an underground continuous wall that can be excavated so as to be continuous with two holes.

[0005]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, the method for forming a continuous underground wall of the present invention is such that the excavation means 4 is provided at the bottom of the apparatus main body 3.
And a stirring means 7 is provided on the upper part of the apparatus main body 3 and
Between the excavation means 4 at the bottom of the body 3 and the stirring means 7 at the top
A drive means 5 is provided and vertically penetrates the apparatus main body 3 to form a lower end.
The opening opens to the side of the excavation means 4 and the upper end opening is a stirring hand.
The excavation rig A is formed by forming the passage 14 that opens to the step 7 side.
Then, the excavator A was inserted into the ground to excavate the ground 2, and the solidifying material was ejected to mix the excavated earth and the solidifying material to fill the mixture of the excavated earth and the solidifying material. The first hole B is formed, and the second hole C is formed in the same manner with the uncut portion D left on the extension line of the first hole B in the lateral direction. When excavating the uncut portion D between the hole C,
In a state where the guide member E is projected downward on both sides of the excavator A and the guide member E is placed along the inner wall of the first hole B and the inner wall of the second hole C on both sides of the undigged portion D. Excavator A
The excavation of the unexposed portion D is performed and the solidifying material is ejected to mix the excavated earth and sand with the solidifying material.

Further, it is preferable that the hole excavated by the excavator A is a square such as a square or a rectangle in plan view.
Further, the guide members E can be detachably attached to the lower portions of both sides of the device body 3 of the excavating device A, and the guide members E can be attached and protrude downward from the device body 3 when the undigged portion D is excavated. preferable.

Further, guide members E are slidably provided at lower portions on both sides of the apparatus main body 3 of the excavator A, and the undigged portion D is left.
It is also preferable that the guide member E is projected downward when excavating the ground.

[0008]

Therefore, according to the present invention having the above-described structure,
IfThe excavation means 4 is provided at the bottom of the device body 3 and the device is also provided.
The stirring means 7 is provided on the upper part of the main body 3 and the lower part of the device main body 3 is provided.
Drive means 5 between the excavation means 4 and the stirring means 7 at the top
It is provided and penetrates the device body 3 vertically, and the lower end opening is a digging hand.
Open to the step 4 side and the upper end opening to the stirring means 7 side
To form the passage 14 to form the excavation rig A,Excavation
Device A is inserted into the ground to excavate the ground 2 and solidifying material
Is ejected to mix the excavated sediment with the solidifying material,
Forming a first hole B filled with a mixture with a binder,
Leaving the uncut portion D on the lateral extension of the first hole B
Similarly, the second hole C is formed, and the first hole B and the second hole C are formed.
When excavating the uncut portion D between C and
The guide member E is projected downward on both sides to
The material E is dug and the inner wall of the first hole B and the second
Uncut by excavator A along the inner wall of hole C
While excavating the ditch D, the solid material is ejected and the excavated earth and sand are removed.
By mixing with the solidifying material,
The drilling equipment can be made to have almost the same horizontal length as the first hole B and the second hole C.
Excavation of the uncut portion D by effectively utilizing the entire lateral length of the table A
And can be guided by the guide member E.
The uncut area is excavated while
Digging even if the horizontal lengths of D and excavator A are almost the same
The remaining portion D should be continuous with the first hole B and the second hole C.
That can be surely excavatedIn addition, excavator A is
And excavate it by the excavation means 4 below the device body 3.
A mixture of excavated earth and sand and a solidifying material through the device body 3 up and down.
By passing it upward through the passage 14, the device main body 3
The driving means 5 and the like are installed between the excavation means 4 and the stirring means 7 of
Mixing of excavated soil and solidified material on the lower side of the equipped device body 3
Through the passage 14 without the thing getting stuck and clogged
Smoothly open the upper opening of the upper part of the device body 3 on the side of the stirring means 7.
It can be concentrated and discharged from the device main body 3 like this
On the device main body 3 without being disturbed by the driving means 5 etc.
Is discharged from the upper opening of the passage 14
A mixture of the excavated sediment and the solidifying material is placed against the passage 14.
The stirring means 7 allows effective stirring and mixing, and all excavated soil
Make sure that the sand and the solidifying material are agitated by the stirring means 7 on the upper part of the apparatus main body.
It will be possible to stir and mix, and pull the device body 3
You Even when raising, the drive means 5 and the like provided in the device body 3 are obstructed.
Passage 1 that vertically penetrates the device body 3 without being disturbed
It is possible to move the stirred mixture at the top downward through
That can be pulled up smoothly.
You.

Further, the hole excavated by the excavator A can have a uniform thickness in each part of the underground continuous wall formed in a square shape such as a square or a rectangle in plan view. Also,
Guide members E can be detachably attached to lower portions of both sides of the device body 3 of the excavating device A. When the guide member E is attached and protrudes downward from the device body 3 when the undigged portion D is excavated, the guide member The guide member E can be protruded when excavating the undigged portion D by the attachment / detachment operation of E so that the guide member E does not get in the way when excavating other than the undigged portion D.

Further, guide members E are slidably provided at lower portions on both sides of the main body 3 of the excavating device A, and the unexposed portion D is left.
If the guide member E is projected downward during excavation of the guide member E, the guide member E is projected during excavation of the undigged portion D only by the sliding operation of the guide member E, and the guide member E interferes during the excavation of the portion other than the undigged portion D. You can prevent it from becoming.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. 4 to 7 show an excavator A used in the present invention.
An example is shown. The apparatus main body 3 has a substantially cubic or rectangular parallelepiped outer shape so as to have a square shape or a rectangular shape in a plan view, is framed by a frame, and an excavation means 4 is provided below the apparatus main body 3. The excavation means 4 includes a plurality of rotary blades 1 for rotary excavation in which a rotary shaft 10 is oriented in a horizontal direction.
The rotary body 11 with a rotary blade for excavation is provided with a plurality of claw portions 16 protruding from the outer peripheral portion thereof, and a blade 17 is provided at the outer end portion of the claw portion 16. In the embodiment shown in the accompanying drawings, a pair of left and right rotary bodies 11 with rotary blades for excavation are arranged in the lower part of the apparatus body 4. Rotating body with a pair of rotary blades for excavation 1
When the ground is excavated while rotating 1, the square or rectangular hole in plan view is formed. The square or rectangular hole in plan view is set so as to correspond to the shape of the apparatus body 3 in plan view. is there. The rotary body 11 with a rotary blade for excavation constitutes the rotating device 1 which constitutes the driving means 5 provided in the main body 3 of the device.
It rotates by 8.

A stirring means 7 is provided on the top of the apparatus main body 3. The stirring means 7 is composed of a plurality of stirring rotators 13 having a rotating shaft 12 oriented laterally, and the stirring rotator 13 has a plurality of claw portions 16 'projectingly provided on the outer periphery of a drum-shaped portion. . A blade may or may not be provided on the outer end portion of the claw portion 16 'of the stirring rotator 13. In the embodiment shown in the accompanying drawings, a pair of left and right stirring rotors 13 are arranged on the upper part of the apparatus body 4. When the excavated earth and sand and the solidifying material are agitated and mixed while rotating the pair of agitating rotary members 13, the agitating and mixing is performed in an area corresponding to the shape of the apparatus body 3 in plan view. The stirring rotator 13 is rotated by a rotator 18 included in the drive unit 5 provided in the apparatus body 3.

When the apparatus main body 3 is inserted into the ground (that is, when it descends), as shown in FIG. 5, the excavated earth and sand are passed between the adjacent rotary bodies 11 with rotary blades for excavation and between the rotary bodies 13 for stirring. The rotary body 11 with a rotary blade for excavation and the rotary body 13 for stirring rotate so that the mixture with the solidifying material moves upward, and conversely, when the device body 3 is pulled up from the ground (that is, when it rises). As shown in FIG. 7, the rotary body 11 with rotary blades for excavation is moved so as to move the mixture of the excavated earth and sand and the consolidating material downward between the rotary bodies 11 with rotary blades for excavation and between the rotary bodies 13 for stirring. Also, the stirring rotator 13 is controlled to rotate.

A vertical passage 14 is formed in the main body 3 for passing a mixture of excavated soil and a solidifying material. This passage 14 is provided with left and right rotary blades for excavation whose lower end openings face each other. The upper end opening is opened between the rotating bodies 11 and the upper end opening is opened between the opposing stirring rotating bodies 13. Further, the guide member E is detachably attached to the lower portions on both sides of the apparatus body 3 by fasteners such as bolts. When the guide member E is attached, the excavation means 4 is attached.
Therefore, when the guide member E is attached, the excavation means 4
It is set so as to project further downward than the rotary body 11 with the rotary blade for excavation. Although not shown, guide members E are slidably attached to both sides of the apparatus main body 3 and a cylinder device is driven to project the guide members E below the rotary body 11 with a rotary blade for excavation. Or
You may be able to raise it. Further, the lower end of the guide member E may be inclined so as to be positioned outward as it goes downward, so that the space between the lower ends of the guide members E facing each other on both sides is expanded in a substantially V shape. In this case, the portion that spreads in a V shape serves as a guide portion, and the guide member E can easily descend smoothly along the wall portions on both sides of the uncut portion D.

The apparatus main body 3 is suspended by a linear member 1 such as a wire, a chain or a chain, and the apparatus main body 3 is provided with a solidifying material spraying section 6 for spraying a solidifying material. . Reference numeral 9 in the drawing denotes a solidifying material supply hose for supplying the solidifying material to the solidifying material injection unit 6, which is connected to a solidifying material supply device (not shown) installed on the ground. The solidifying material supply hose 9 is attached along the linear material 1. The linear material 1 is suspended from the ground by a construction machine installed on the ground, and the linear material 1 is wound around a drum provided on the construction machine.

A rotary body with a rotary blade for excavation which constitutes the excavation means 4 in a state of being suspended by the linear material 1 from a construction machine in which the soil fixing device main body 3 is installed on the ground using the above-mentioned device. While rotating 11 to excavate the ground, the apparatus main body 3 is inserted into the ground by the excavation and the own weight of the apparatus main body 3.
In this case, the above-mentioned excavation is performed while injecting a solidifying material such as cement milk, a mixture containing cement milk as a main material, a synthetic resin liquid, or a mixture of a synthetic resin liquid and another material from the solidifying material spraying part 6. At the same time, the stirring rotating body 13 constituting the stirring means 7 is rotated to stir and mix the excavated earth and sand and the solidifying material. In the embodiment shown in the accompanying drawings, the device main body 3
When it is inserted into the ground, as shown in FIG. 3, the mixture of the excavated earth and sand and the consolidating material is moved upward through the adjacent rotating bodies 11 with rotary blades for excavation, ascending in the passage 14, and a pair of agitators for stirring. By rotating the pair of stirring rotors 13 between the rotors 13 as shown in FIG. 5, the mixture of excavated earth and sand and the solidifying material moves upward while being stirred and mixed through the rotors 13 for stirring. . In this way, the device body 3 is straightly inserted into the ground by excavation and its own weight. When the device body 3 descends to a predetermined depth, the linear body 1 is pulled up to raise the device body 3.
At the time of pulling up from the ground (that is, at the time of rising), the rotating directions of the stirring rotary body 13 and the rotary body 11 with rotary blade for excavation are reversed as shown in FIG. The direction of rotation is reversed, and the mixture of excavated earth and sand and the solidifying material is moved downward through the space between the adjacent agitating rotors 13, and the passage 1
4 is moved downward and is moved downward between the pair of rotary bodies 11 with rotary blades for excavation by the pair of rotary bodies 11 with rotary blades for excavation. When the apparatus body 3 is pulled up, the solidifying material may or may not be ejected. In this way, the apparatus body 3 is pulled up by the linear material 1 to form the first hole B in which the mixture of the excavated earth and sand and the solidifying material is filled (see FIG. 1).

Next, a second hole C is formed in the same manner with the uncut portion D left on the extension line of the first hole B in the lateral direction (see FIG. 2). In this case, the lateral length L of the uncut portion D is the same as the lateral length of the first hole B. After a while, the first
When the mixture of the excavated earth and sand and the solidifying material in the holes B and the second holes C is in an uncured state (this uncured state is not only immediately after the mixture is mixed, but also for several hours or a few after the mixture is mixed). Even after the day has passed, the mixture is much softer than the surrounding ground, so this state is naturally called the uncured state.) Excavator A
The excavation of the uncut portion D is performed and the solidifying material is ejected to mix the excavated earth and sand with the solidifying material. In excavating the undigged portion D, the guide member E is projected downward on both sides of the excavator A, and the guide member E is formed on the inner wall and the second hole of the first hole B on both sides of the undigged portion D. The inner wall of C is ground to form the third hole F (see FIG. 3). In this way, the guide member E is guided by the wall portion of the uncut portion D facing the first hole B and the second hole C, and the excavator A
As the excavation device A advances, the unexcavated portion D is surely excavated without the excavation device A being displaced toward the first hole B or the second hole C side, and at the same time, the unexposed portion D is excavated in the excavation device A. It is possible to effectively utilize the entire excavation means 5 to excavate the undigged portion D.

By the way, when the excavation equipment A is suspended by a linear material, during the process of excavating the first hole B, the second hole C and the uncut portion D by the excavation equipment A, the excavated earth and sand overflows on the ground. The mixture of the solidifying material and the solidifying material is almost the total of the amount of swelling of the excavating earth and sand, the amount of the solidifying material sprayed, and the volume of the apparatus body 3, and the conventional excavating shaft is inserted. There is no possibility that the volume of the inserted excavation shaft will increase proportionally when the insertion depth becomes deeper, like the thing.

By the way, the passage 14 provided in the apparatus main body 3 may be provided with a transfer means 15 for forcibly moving the mixture of earth and sand and the solidifying material through the passage 14. When the transfer means 15 is provided, a pair of rotary bodies with rotary blades for excavation 1
To smoothly transfer the mixture of the excavated earth and sand and the solidifying material between one pair of the rotating bodies for stirring 13 or between the pair of rotating bodies for stirring 13 and the pair of rotating bodies 11 with the rotary blade for excavation. Is something that can be done. An example of the transfer means 15 is shown in FIGS.
By rotating 6 by rotating in the normal or reverse direction, the passage 1
The mixture is transferred upward or downward through the inside of 4. Further, FIGS. 8 and 9 show another embodiment of the transfer means 15, in which a pump 27 for transferring the mixture is provided in the passage 14, and in FIG. 8 and FIG. It is composed of an ascending passage 14a and a descending passage 14b, and a pump 27a for ascending the mixture and a pump 27b for descending the mixture are provided in each of the passages 14a, 14b. Further, as another embodiment of the transfer means 15, FIG.
As shown in 0, the passage 14 is composed of a flexible hose such as rubber, a plurality of arms 29 are radially provided on the rotating body 28, and the rollers 30 are rotatably provided at the tips of the arms 29 to rotate. By rotating the body 28, the roller 30 is rotated while being pressed against the outer surface of the flexible hose one after another, so that the mixture in the hose is transferred in the arrow direction shown by the broken line in FIG. When the rotating body 28 is rotated in the opposite direction, the mixture in the hose is transferred in the opposite direction.

A sled-like posture control member 32, which is driven by a cylinder 31 and can freely change a vertical posture and a tilt posture, is provided on each side surface of the device body 3, and the inclinometer provided in the device body 3 is provided. When the inclination of the apparatus main body 3 is detected by 33, the cylinder 31 is driven by this detection signal to press the upper portion or the lower portion of the attitude control member 32 against the hole wall (for example, in FIGS. 5, 6, and 7). The posture control member 32 is tilted as shown by an imaginary line) to control the posture of the figure apparatus body 3 to maintain vertical accuracy.

[0021]

According to the present invention, as described above, the device
On the lower part of the main body, the excavation means is installed and on the upper part of the device main body.
A stirring means is provided and the excavation means at the bottom of the device main body and the excavation means at the top
A drive means is provided between the stirring means and the device body to move up and down.
The bottom opening opens through to the excavation means side and the top opening.
The excavator is formed by forming a passage whose mouth opens toward the stirring means.
And excavate the ground by inserting this excavating device into the ground and eject the solidifying material to mix the excavated earth and the solidifying material to fill the mixture of the excavated earth and the solidifying material. No. 1 hole is formed, and a second hole is similarly formed by leaving the uncut portion on the extension line in the lateral direction of the first hole, and the second hole is formed between the first hole and the second hole. When excavating the remaining portion, the guide member is projected downward on both sides of the excavation device, and the guide member is placed along the inner wall of the first hole and the inner wall of the second hole on both sides of the uncut portion. Since the excavation device excavates the uncut portion and ejects the solidifying material to mix the excavated soil and the solidifying material, the lateral length of the unexposed portion, that is, the first hole and the second hole. The distance between them can be made the same horizontal length as the first hole and the second hole, and moreover, the uncut portion is surely excavated by the excavation device and the first hole and the second hole. As a result, the horizontal length of the uncut portion is longer than in the past, so the number of times of excavation when forming the underground wall of the required horizontal length is small, and the construction time is long. It is shortened, moreover state, and are not capable of forming a drill part of the digging left portion and the first hole and diaphragm wall continuity and excellent with the second hole, and further drilling instrumentation
The device is inserted into the ground and the excavation means at the bottom of the device body excavates.
Move the equipment body up and down with the mixture of excavated earth and sand and solidifying material.
By passing it upward through a passage that penetrates,
Device equipped with driving means between cutting means and stirring means
The mixture of excavated soil and solidifying material stays in the lower part of the body.
Device book smoothly through the aisle without getting clogged
Concentrated discharge from the upper opening to the stirring means side of the upper part of the body
In this way, the drive means etc. provided in the device body are disturbed.
The upper opening of the passage at the top of the device
A mixture of excavated sediment and solidification material that is discharged intensively from the
The stirrer facing the passage effectively stirs and mixes.
Make sure all the excavated soil and solidification material are on the top of the device body.
It becomes possible to stir and mix by the stirring means of
When pulling up the device body, the drive
Penetration up and down the device body without being disturbed by steps
Moving the upper stirred mixture downward through the passage
It can be pulled up and pulled up smoothly . <br/>

Further, it is possible to make constant the thickness of each part of the underground continuous wall formed when the hole excavated by the excavator is a square such as a square or a rectangle in plan view, and to prevent water stoppage at each part of the underground wall. The strength can be kept constant. In addition, the guide members can be detachably attached to the lower portions of both sides of the device body of the excavator, and when the guide members are attached and protrude downward from the device body when excavating the uncut portion, the guide member can be attached and detached. The guide member is projected during the excavation of the undigged portion, and the guide member does not interfere during the excavation of the portion other than the undigged portion.

Further, guide members are slidably provided at lower portions on both sides of the main body of the excavating device, and when the guide member is projected downward when excavating the undigged portion, only the unoperated portion is slid. It is possible to project the guide member at the time of excavation so that the guide member does not get in the way at the time of excavation except the undigged portion.

[Brief description of drawings]

FIG. 1A is a vertical cross-sectional view showing an excavated state of a first hole in the present invention, and FIG. 1B is a cross-sectional view of the formed first hole.

FIG. 2A is a vertical cross-sectional view showing a construction state of a second hole in the present invention, and FIG. 2B is a cross-sectional view of the formed first hole and second hole.

FIG. 3 (a) is a vertical cross-sectional view showing a state where the uncut portion between the first hole and the second hole is being excavated in the present invention, and FIG. 3 (b) is the formed first portion. Hole, second hole and third hole
It is a cross-sectional view showing the excavation of the hole.

FIG. 4 is a perspective view of an embodiment of an excavating device used in the present invention.

FIG. 5 is a front cross-sectional view showing a state in which the excavation device of the above is inserted into the ground.

FIG. 6 is a side sectional view showing a state in which the excavation device of the above is inserted into the ground.

FIG. 7 is a front cross-sectional view showing a state in which the excavation device of the above is pulled up.

FIG. 8 is a perspective view of another embodiment of the excavator used in the present invention.

FIG. 9 is an explanatory view showing the above-mentioned passage and transfer means.

FIG. 10 is a schematic explanatory diagram of another embodiment of the above passage and transfer means.

[Explanation of symbols]

 A excavator B first hole C second hole D uncut portion E guide member 2 ground 3 device body

Claims (4)

(57) [Claims] 1. When the excavation means is provided at the bottom of the apparatus body,
The upper part of the device body is provided with a stirring means and the lower part of the device body
A drive means is provided between the excavation means of the
The bottom of the excavation means side by penetrating up and down the machine body.
Form a passage with the upper end opening to the stirring means side
To form an excavation device , insert the excavation device into the ground to excavate the ground, and eject a solidifying material to mix the excavated earth and solidifying material to form the excavated earth and solidifying material. A first hole filled with the mixture is formed, and a second hole is similarly formed by leaving an uncut portion on a lateral extension line of the first hole,
When excavating the uncut portion between the first hole and the second hole, the guide member is projected downward on both sides of the excavating device, and the guide member is formed on the inner wall of the first hole on both sides of the uncut portion. And the inner wall of the second hole, the uncut portion is excavated by the excavator and the solidifying material is ejected to mix the excavated earth and sand with the solidifying material. Forming method. 2. The method for forming a continuous underground wall according to claim 1, wherein the hole excavated by the excavation device is a square such as a square or a rectangle in a plan view. 3. A guide member is detachably attachable to lower portions on both sides of a device body of an excavating device, and the guide member is attached to project downward from the device body when excavating an undigged portion. The method for forming an underground continuous wall according to claim 1. 4. The underground continuation according to claim 1, wherein guide members are slidably provided at lower portions of both sides of a main body of the excavating device, and the guide members are projected downward when excavating the undigged portion. How to form a wall.