JP2001336146A - Construction method and device for continuous underground wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method and device for a continuous underground wall capable of continuously excavating ground without drawing up work of an auger excavator and its reinstallation when constructing a continuous underground wall and miniaturizing the equipment for the construction and reducing its weight. SOLUTION: In the construction method for a continuous underground wall, while excavating the ground by the construction device provided with an auger excavator down to a specified depth, cement milk is injected to change excavated soil into soil cement and then while transferring the construction device, the ground is excavated by the auger excavator to construct the underground wall. The construction device is provided with one auger excavator in which a number of excavating bits radially extruding outwards are fitted to the outer periphery of a spiral blade formed around the rotary shaft. After the ground is excavated down to a specified depth by the auger excavator, the construction device is transferred and the auger excavator is moved horizontally to construct the underground wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous underground wall forming method for continuously forming soil cement underground walls by injecting cement milk while excavating the ground and mixing with soil. The present invention relates to a forming apparatus to be used.

[0002]

2. Description of the Related Art A continuous underground wall is formed by excavating the ground (in situ soil) using a forming device having an auger excavator, etc., and simultaneously injecting cement milk into the excavated portion to mix the soil and cement milk. It is performed by stirring and mixing.

As an auger excavator used for forming the continuous underground wall, an auger excavator usually provided with a drilling blade at the tip of a rotating shaft and provided with a spiral blade for stirring and mixing around the rotating shaft. It is well known that a conventional forming apparatus generally has a plurality of auger excavators.

In the formation of a continuous underground wall by such a construction machine, when the ground is excavated and a ground wall is formed to a predetermined depth by an auger excavator, the auger excavator is once pulled up, and then the construction apparatus is moved to the next excavation position. The process of moving, then lowering the auger excavator again to perform excavation was repeated.

[0005] However, in such a conventional continuous underground wall construction method, as described above, the auger excavator is raised every time excavation is performed, so that the time required for the excavation work becomes long, and the underground wall construction work requires a long time. It was also a factor to make it. In addition, the auger excavator itself is long and has a considerable weight, and since a plurality of ordinary auger excavators are provided, it is inevitable to support the auger excavator. The construction device also becomes larger and heavier. Furthermore, lifting, moving, and relocating the auger excavator are dangerous, so it was necessary to minimize these operations as much as possible.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and makes it possible to continuously excavate the underground wall without raising and re-installing the auger excavator. Another object of the present invention is to provide a continuous underground wall forming method and a continuous underground wall forming apparatus which can reduce the size and weight of the apparatus used for the formation.

[0007]

A continuous underground wall forming method according to the present invention comprises excavating soil by injecting cement milk while excavating the ground to a predetermined depth by a construction apparatus having an auger excavator. When the ground is excavated by the auger excavator while the formation device is moved and the underground wall is formed, the formation device is attached to the outer periphery of a spiral wing provided around the rotation axis in the radial direction. A single auger excavator equipped with a number of excavating bits protruding in the direction, after excavating the ground to a predetermined depth by the auger excavator, moving the development device to move the auger excavator in a horizontal direction. The underground wall is created by moving the underground wall.

In the continuous underground wall forming method according to the present invention, as an auger excavator used for excavating the ground, a bit for excavation is attached to a spiral wing provided on a rotating shaft, and agitation of cement milk is performed while excavating the ground. And soil are to be mixed. Therefore, excavation can be performed continuously without raising the auger excavator, and an underground wall can be created, so that work efficiency can be improved and the construction period can be shortened. Moreover, since only one auger excavator is used for the construction, the size and weight of the apparatus itself can be reduced.

[0009] The continuous underground wall construction method according to the present invention comprises:
After excavating the ground to a predetermined depth by the auger excavator, the auger excavator is moved in the horizontal direction by moving the forming device, and the underground wall is moved by reciprocating the auger excavator in the vertical direction. It is characterized by creating. By doing so, excavation by the auger excavator and creation of the underground wall can be performed more efficiently.

Further, the continuous underground wall forming method according to the present invention is characterized in that the ground is excavated by inclining the auger excavator at a predetermined angle with respect to the moving direction of the generating apparatus. Thereby, excavation by the auger excavator and creation of the underground wall can be performed more efficiently. In addition, by inclining the auger excavator, the ground stress acting on the auger excavator in the horizontal direction (moving direction of the creating device) causes a component (component force) acting in the axial direction of the rotating shaft, It can be divided into vertical components. This makes it possible to reduce the ground stress acting in the bending direction of the rotating shaft, that is, in the direction perpendicular to the axis. Therefore, it can contribute to weight reduction of the auger excavator. Further, it is possible to create an underground wall having an inclined wall surface.

[0011] The present invention also relates to a construction apparatus used for construction of a continuous underground wall.

The continuous underground wall forming apparatus according to the present invention includes a rotating shaft, a spiral blade attached around the rotating shaft, rotating means for the rotating shaft, and means for elevating and lowering the rotating shaft. One auger excavator provided with a number of excavating bits protruding radially outward on the outer periphery of the wing, means for moving the auger excavator in a horizontal direction, and means for inclining the auger excavator. It is equipped.

[0013] The continuous underground wall forming apparatus according to the present invention is an auger excavator used for excavating the ground, which is equipped with a bit for excavation on a spiral wing provided on a rotating shaft to excavate the ground. While mixing the cement milk and mixing with the soil. Therefore, excavation can be performed continuously without raising the auger excavator, and an underground wall can be created, so that work efficiency can be improved and the construction period can be shortened. In addition, since this device has only one auger excavator,
The size and weight of the device itself can be reduced.

[0014] The continuous underground wall forming apparatus according to the present invention includes:
One auger including a rotating shaft, a rotating means of the rotating shaft, and a lifting / lowering means of the rotating shaft, and provided on the outer periphery of the rotating shaft with a plurality of drilling bits protruding radially outward. An excavator, means for moving the auger excavator in a horizontal direction, and means for inclining the auger excavator.

In the continuous underground wall forming apparatus according to the present invention, a large number of excavating bits are arranged directly on the outer periphery of the rotating shaft. With this configuration, it is possible to simultaneously and efficiently excavate the ground in the moving direction of the development device and mix and agitate the in-situ soil and the cement milk.

In this case, the drill bits may be spirally arranged. Thereby, the resistance which the auger excavator receives from the ground during the excavation can be reduced, and the excavation of the ground and the mixing and stirring of the excavated soil and the cement milk can be performed simultaneously and efficiently.

In the continuous underground wall forming apparatus according to the present invention, the excavating bits are alternately arranged horizontally upward and downward. By arranging the excavating bits in such a manner, it becomes possible to perform excavation and underground wall formation while reciprocating the auger excavator up and down, thereby enabling more efficient underground wall creation work.

Further, in the continuous underground wall forming apparatus according to the present invention, a plurality of bit holders are mounted around the outer edge of the spiral blade in the axial direction of the rotary shaft, and the bits are mounted on the bit holders. It is characterized by having. Even with such a configuration, it is possible to continuously excavate without raising the auger excavator and to construct an underground wall, thereby improving work efficiency and shortening the construction period. It becomes possible.

Further, the continuous underground wall forming apparatus according to the present invention is characterized in that an outer diameter of a rotary shaft of the auger excavator is formed to be smaller from a base end to a tip. As a result, the rigidity of the auger excavator required for excavation can be ensured and the weight can be reduced.

[0020]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 schematically show an embodiment of a forming apparatus according to the present invention. FIG. 1 is a front view, and FIG. 2 is a side view. You. The illustrated construction device 1 includes an auger excavator (earth auger) 2 and a self-propelled crawler 3 that supports the auger excavator 2. The crawler 3 includes a vehicle body 4, a caterpillar 5, a frame 6 supporting the auger excavator 2, a hydraulic cylinder 7 supporting the auger excavator 2, and hydraulic cylinders 8, 9 supporting the auger excavator 2 and moving the same in a horizontal direction. The self-propelled vehicle is driven by driving the caterpillar 5 by a driving engine (not shown). An actuator (not shown) for raising and lowering the auger excavator 2 up and down is also provided. Further, by making the strokes of the hydraulic cylinders 8 and 9 different, it is possible to tilt the auger excavator 2 as shown by an arrow in FIG.

The auger excavator 2 includes a rotating shaft 10, a slide guide 11, a drive motor 12, and a main shaft reaction force receiver 13. A spiral blade 14 is attached to the rotating shaft 10 in the axial direction, and a bit 15 for vertical excavation is attached to a tip portion.
The slide guide 11 plays a role of guiding the rotating shaft 10 when moving the rotating shaft 10 in the vertical direction, and the rotating shaft reaction force receiver 13 plays a role of receiving a reaction force generated on the rotating shaft during excavation. Further, an injection port (not shown) of cement milk is provided at the tip of the rotating shaft 10. Further, by operating the hydraulic cylinder 7, the auger excavator 2 is
Can be inclined in the direction indicated by the arrow.

FIG. 3 is an enlarged view of a part of the rotating shaft of the auger excavator 2 and shows its details. As shown in the figure, a number of lateral excavation bits 16 are attached to the spiral blade 14 attached to the rotating shaft 10 in the circumferential direction so that the tips project radially outward of the spiral blade 14. ing. In the auger excavator 2, by providing a large number of lateral excavation bits 16 on the spiral blade 14 in this way, excavation and mixing and agitation of in-situ soil and cement milk can be performed simultaneously, and When the excavation proceeds, it is not necessary to raise the auger excavator 2 every time a new place is excavated, and the excavation can be continuously performed in the horizontal direction.

The lateral excavation bit 16 may be provided, for example, so that the tip (edge) is horizontal (parallel to the ground), but in particular, as shown in FIG. The drill bits 16a and the downward drill bits 16b may be provided alternately. By doing so, excavation can be performed by moving the auger excavator 2 in the horizontal direction and also in the vertical direction in order to promote the mixing and agitation of the in-situ soil and the cement milk, and perform the excavation. Become like

FIG. 4 schematically shows a process of forming an underground wall by the continuous underground wall forming method according to the present invention. Less than,
The procedure will be described.

First, as shown in FIG. 4A, the auger excavator 2 is lowered to the excavation start position while rotating the rotating shaft 10 to perform excavation in the vertical direction (vertical excavation). For this excavation, a vertical excavation bit 15 attached to the tip of the rotating shaft 10 is used.

After the shaft excavation is performed to a predetermined depth, FIG.
As shown in the figure, the shaving apparatus 1 (not shown) is moved in the horizontal direction (the direction of the arrow in the figure) while rotating the rotating shaft 10 of the auger excavator 2, and the lateral drilling bit attached to the rotor 14 is Excavation in the horizontal direction is performed according to 16 (see Fig. 3). At this time, at the same time, the cement milk is spouted from the spout provided at the tip of the rotating shaft, and is stirred and mixed with the in-situ soil to produce soil cement. Auger excavator
The second rotation shaft 8 may be moved up and down simultaneously with the horizontal movement as shown by the arrow in the figure. This allows for more effective drilling and soil cement production.

Thereafter, when the horizontal excavation reaches a predetermined distance, the auger excavator 2 is pulled up as shown in FIG. 4 (c). Also, as shown in FIG. 4 (d), excavation is completed, and the core 17 is sequentially inserted into the location where the soil cement has been prepared, thereby completing the construction of the underground wall.

FIG. 5 shows the ground stress applied to the rotary shaft 10 when the auger excavator 2 is vertically excavated and when the auger excavator 2 is inclined and excavated, that is, the ground stress in the moving direction of the development device 1. Things. As shown in FIG.
When the auger excavator 2 is excavated vertically, all ground stresses applied in the horizontal direction act in the direction perpendicular to the axis of the rotating shaft 10, that is, in the bending direction. On the other hand, as shown in FIG.5 (b), when excavating the auger excavator 2 at an angle θ, the ground stress is divided into a component parallel to the rotation axis 10 and a component perpendicular to the rotation axis 10. It acts on the rotation axis. Therefore, the component perpendicular to the rotation axis 10, that is, the force acting in the bending direction can be reduced by cos θ as compared with the case of FIG. 5 (a).

FIG. 6 shows another embodiment of an auger excavator,
A part of the rotation shaft is shown in an enlarged manner. In the figure,
A plurality of spiral wings 21 are arranged on the rotating shaft 20 with a sense of a predetermined distance in the axial direction, and a plurality of lateral drilling bits 22 are arranged on the outer edge of the spiral wing 21 in a row, and bit holders 23a to 23c is installed. With such a configuration, the excavation by the excavation bit 22 and the spiral blade 21
Mixing and agitation of the in situ soil and the cement milk can be performed simultaneously. Note that the lateral drilling bit 22
As in the case of FIG. 3 (c), the blade with the blade edge facing upward and the blade with the blade edge facing downward may be alternately arranged. Also, three bit holders are mounted on one spiral blade in the illustrated example, but it goes without saying that other number of bit holders may be mounted.

FIGS. 7 and 8 show still another embodiment of the auger excavator in which a part of a rotary shaft thereof is enlarged. In FIG. 7, rotating shaft elements 30a to 30c having different outer diameters are
The rotation shaft 30 is formed by connecting the rotation shaft from the base end side of the rotation shaft, that is, the side supported by the forming device (not shown) so that the outer diameter decreases toward the distal end portion. this is,
In order to cope with soil stress that changes depending on the excavation depth,
The outer diameter of the rotation shaft on the proximal end side is made larger. Although only three rotating shaft elements are shown here, it goes without saying that the number can be increased or decreased according to the excavation depth. The spiral blades provided on the rotary shaft element also have a plurality of spiral blades 31a to 31c arranged at intervals in the figure, but as in the example shown in FIG. It goes without saying that a spiral wing over the whole may be used.

The rotary shaft 40 shown in FIG. 8 is also configured so that the outer diameter decreases from the base end toward the distal end, similarly to the rotary shaft shown in FIG. 40a-4
0c is tapered so that the outer diameter changes continuously. In the case of the rotating shaft 40, only three rotating shaft elements are shown in the drawing, but it is needless to say that the number thereof can be increased or decreased according to the excavation depth. Further, the spiral blades provided on each rotary shaft element also have a plurality of spiral blades 41a to 41c arranged at intervals in the figure, but in this case, as in the example shown in FIG. It goes without saying that a spiral wing may be provided over substantially the entire longitudinal direction of the element.

FIG. 9 schematically shows another embodiment of the forming apparatus according to the present invention. The illustrated forming device 51 also has
An auger excavator 52 and a self-propelled crawler 53 that supports the auger excavator 52 are provided. The crawler 53 includes a vehicle body 54, a caterpillar 55, an auger support frame 56, and an auger support link.
57, a horizontal support arm 58 for suspending and supporting the auger excavator 52 by a wire 59.

The auger excavator 52 includes a rotating shaft 60, a slide guide 61, and a drive motor 62, similarly to the one shown in FIG. A plurality of spiral blades 63 are attached to the rotating shaft 60 at predetermined intervals in the axial direction. Although not shown in detail in the drawings, the rotating shaft 60 is assumed to take one of the forms shown in FIGS. 3 and 6 to 8 described above.

In the illustrated device 51, the link arm 57 of the crawler 53 is composed of two links 57a and 57b,
Are connected with each other by the
57b and auger support frame 56 are connected. The auger support frame 56 and the horizontal support arm 58 are connected by a pin 66. Thereby, the auger support frame 56 can be inclined at a predetermined angle, so that the auger excavator 52 can excavate in an oblique direction with respect to the excavation traveling direction. Thereby, excavation of the ground and mixing and stirring of the in situ soil and the cement milk can be performed more effectively.

FIG. 10 shows another embodiment of the auger excavator in the land preparation apparatus according to the present invention, in which a part of the rotation shaft is enlarged. In the figure, a number of lateral excavation bits 71 are randomly arranged and directly attached to the surface of the rotating shaft 70. With this configuration, it is possible to simultaneously and efficiently excavate the ground in the moving direction of the development device and mix and agitate the in-situ soil and the cement milk. In this case, each of the lateral excavation bits 51 may be arranged such that the cutting edge thereof is directed upward and the cutting edge thereof is directed downward.

FIG. 11 shows still another embodiment of the auger excavator in the land preparation apparatus according to the present invention, with a part of its rotating shaft being enlarged. In the figure, a number of lateral excavation bits 81 are spirally arranged in the axial direction of the rotating shaft 60 and directly mounted on the surface of the rotating shaft 80. By adopting such a configuration, the resistance received by the auger excavator from the ground during excavation can be reduced, and the excavation of the ground and the mixing and stirring of the in-situ soil and the cement milk can be performed simultaneously and efficiently. It becomes possible. Also in this case, as in the case of FIG. 3 (c), the lateral excavation bit 81 may be configured such that the one with the cutting edge facing upward and the one with the cutting edge facing downward are alternately arranged.

As described above, according to the continuous underground wall forming method and the continuous underground wall forming apparatus of the present invention, excavation is continuously performed without raising the auger excavator to form the underground wall. This makes it possible to improve work efficiency and shorten the construction period. Moreover, since only one auger excavator is used for the construction, the size and weight of the apparatus itself can be reduced.

The present invention is not limited to the construction of the underground wall,
For example, it is needless to say that the present invention can be applied to trenching work in construction work such as installation and replacement of underground pipes such as water pipes and gas pipes, and ground improvement work at construction sites.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing an embodiment of a continuous underground wall creation device according to the present invention.

FIG. 2 is a side view schematically showing an embodiment of a continuous underground wall creation device according to the present invention.

FIG. 3 is an enlarged view showing a part of a rotation shaft of the auger excavator.

FIG. 4 is a view schematically showing a process of creating an underground wall by the creating device according to the present invention.

FIG. 5 is a diagram showing ground stress applied to a rotating shaft of an auger excavator during excavation.

FIG. 6 is a partially enlarged view showing another embodiment of the rotating shaft of the auger excavator.

FIG. 7 is a view showing still another form of the rotating shaft of the auger excavator.

FIG. 8 is a view showing still another form of the rotating shaft of the auger excavator.

FIG. 9 is a view schematically showing another embodiment of the continuous underground wall creation device according to the present invention.

FIG. 10 is a view showing still another form of the rotating shaft of the auger excavator.

FIG. 11 is a view showing still another form of the rotating shaft of the auger excavator.

[Explanation of symbols]

 1,51 Continuous underground wall creation device 2,52 Auger excavator 3,53 Self-propelled crawler 4,54 Crawler body 5,55 Caterpillar 6,56 Auger support frame 7,8,9 Hydraulic cylinder 10,20,30 , 40,60,70 Rotary shaft 11,61 Slide guide 12,62 Drive motor 13 Rotary shaft reaction force receiving 14,21,31,41,63 Spiral wing 15 Vertical drilling bit 16,22,71,81 Lateral direction Drilling bit 17 Core 23 Bit holder 57 Auger support link 58 Horizontal support arm 59 Wire 64, 65, 66 pin

Claims (9)

[Claims] An excavator equipped with an auger excavator excavates the ground to a predetermined depth, while injecting cement milk to soil-cement the excavated soil, and then moving the excavator by means of the auger excavator. In excavating the ground to create an underground wall, the auger is configured such that the auger is provided with a number of excavating bits protruding radially outward on an outer periphery of a spiral wing provided around a rotation axis. An excavator is provided, and after excavating the ground to a predetermined depth by the auger excavator, the underground wall is created by moving the creating device to move the auger excavator in a horizontal direction. , Continuous underground wall construction method. 2. The method according to claim 1, wherein after the ground has been excavated to a predetermined depth by the auger excavator, the auger excavator is moved horizontally by moving the forming device, and the auger excavation is performed. A method of forming a continuous underground wall, wherein the underground wall is created by reciprocating the machine vertically. 3. The continuous underground method according to claim 1, wherein the auger excavator excavates the ground by inclining the auger excavator at a predetermined angle with respect to a moving direction of the creating device. Wall creation method. 4. A rotating shaft, a spiral blade attached around the rotating shaft, a rotating unit for the rotating shaft, and a lifting / lowering unit for the rotating shaft, the outer periphery of the spiral blade being radially outside the spiral blade. A continuous underground wall forming apparatus, comprising: an auger excavator provided with a number of excavating bits projecting in a direction, a means for moving the auger excavator in a horizontal direction, and a means for inclining the auger excavator. . 5. A rotating shaft, rotating means for the rotating shaft, and elevating means for the rotating shaft, wherein a number of drill bits protruding radially outward are arranged on the outer periphery of the rotating shaft. A continuous underground wall forming apparatus, comprising: one provided auger excavator; means for moving the auger excavator in a horizontal direction; and means for inclining the auger excavator. 6. The continuous underground wall forming apparatus according to claim 5, wherein the plurality of excavating bits are spirally arranged in the axial direction of the rotating shaft. 7. The continuous underground wall forming apparatus according to claim 4, wherein the excavating bits are alternately arranged horizontally upward and downward. 8. The shaping apparatus according to claim 4, wherein a plurality of bit holders are attached to an outer edge of the spiral blade in a direction of an axis of the rotary shaft, and the bits are mounted on the bit holders. A continuous underground wall creation device, characterized by the following. 9. The generating apparatus according to claim 4, wherein an outer diameter of a rotation shaft of the auger excavator is formed to decrease from a base end to a tip. Do
Continuous underground wall creation device.