JP2019138047A - Ground improvement method and ground improvement device using mechanical stirring deep layer mixing method - Google Patents

Abstract

To provide an all directions ground improvement method and device which can construct a ground improvement pile and a ground improvement body with a desired cross section shape such as underground enlarged diameter and underground bent improvement pile in all directions and which can reduce cost with high workability.SOLUTION: An excavation and stirring device 6 is installed at a lower end of a rotation device in which a vertical rotation body 3 including a vertical portion connected to a horizontal axis portion and freely rotating in a vertical plane is installed at a lower end of a horizontal rotating body including a horizontal portion pivotally supported by a vertical axis portion and freely rotating in a horizontal plane. An upper end of the rotation device is attached to a lower end of a rod 1. As necessary, the rotation device makes the excavation and stirring device 6 inclined in a desired direction S in a vertical plane and rotated in a desired direction in a horizontal plane, and stirring deep layer mixing treatment is performed. A ground improvement pile and a ground improvement body with a desired shape are constructed in a desired range in all directions.SELECTED DRAWING: Figure 1

Description

The present invention relates to an omnidirectional ground improvement method and an omnidirectional ground improvement device, and more specifically, a cement-based stabilizer and an in-situ soil are stirred and mixed by a processing machine to form a ground improvement pile or a ground improvement body. The omnidirectional ground improvement method and the omnidirectional ground improvement device suitable for the ground improvement in a desired range in all directions of the original ground using the mechanical stirring deep mixing method that solidifies and improves the soft ground Belongs to the technical field.
In addition, in this specification, the above-mentioned “ground improvement pile” is a vertical pile with a circular cross section, a pile with a node, or a pile with a special shape formed by expanding or tilting a part (an irregular shape). The “soil improvement body” refers to a structure in which the ground improvement pile is continuously formed in one direction and formed into a wall shape.

The cross section of the ground improvement resistance constructed by the mechanical deep mixing method is circular and constant in the depth direction. For example, in the case of liquefaction countermeasures using the grid-like ground improvement method, the stress is most severe in the deep part, but the cross-section cannot be changed in the depth direction. It is not possible to construct a wall with a large cross section (expanded diameter).
In order to enlarge the cross-section only in the deep part, it is necessary to construct two rows of improvements. However, for that purpose, it is necessary to perform the blanking work even in the shallow part, which is uneconomical. Although the compressive strength of the ground improvement body is high, the tensile strength can be expected only about 10 to 15% of the compressive strength. In addition, since an upper limit is set for the tensile strength, the allowable tensile stress does not increase no matter how much the compressive strength is increased. If the tensile stress becomes a critical stress, the cross section is enlarged to cope with it. However, it is uneconomical. In such a case, as shown in FIG. 9B, if it is possible to construct a cross section provided with ribs, it is not necessary to place extra improvement resistors, leading to cost reduction. Moreover, if the direction can be changed in the ground as shown in FIG. 9C by the construction of mechanical improvement resistance, it can be used for seismic reinforcement of existing structures.

  On the other hand, when the jet stirring method is used, it is possible to change the cross section in the ground by changing the discharge pressure of cement milk and the rotation speed of the rod. However, in the jet type agitation method, there is no guarantee that the predetermined shape can be improved in the ground, and the reliability for construction is low. On the other hand, if the mechanical type is improved, the portion through which the stirring blade has passed is definitely improved, so that the reliability of the work on the finished shape is high.

  Here, for example, in the ground improvement method described in Patent Document 1 below, as shown in FIGS. 1 to 4 of the same Document 1, excavation / stirring provided with a stirring blade 3 capable of excavating / stirring the ground. An improvement method for soft ground using the device, after drilling with the stirring blade 3 closed to the soft ground 2 requiring improvement (FIG. 1), the soft ground excluding the improvement unnecessary layer 1 From the upper end to the lower end of 2, the agitating blade 3 is opened at a predetermined angle (FIG. 2), the excavation process for drilling the ground, and the agitating blade 3 is further opened at a predetermined angle or fully opened (FIG. 3) and pulled up while rotating. The pulling process for drilling is repeated alternately. And the improvement method of the soft ground which rotates the stirring blade 3 while discharging the improved material into the soft ground 2 and improves the ground to create the improved body 4 to the upper end of the soft ground 2 that needs to be improved (FIG. 4). Is disclosed.

  Further, in Patent Document 2, as shown in FIG. 1 of Patent Document 2, the entire shape is formed in a substantially conical shape, a pre-excavated blade 4 having an appropriate shape is attached to the tip portion, and a spiral shape is formed on the upper portion. One of the auger heads 3 is provided at the upper part of the auger head 3 formed integrally with the wing pieces 5 and by a hinge 6 or the like below the casing 1 formed by integrally attaching the spiral convex part 2 to the peripheral part. The foundation ground digging hole in which the auger head 3 as a whole is attached to the casing 1 axis so that it can be folded and closed at a fixed inclination angle by expanding and contracting a movable rod such as a hydraulic jack 7. The apparatus is disclosed (the left figure of FIG. 1). Using this digging device, the digging is carried out in the ground, and when the digging reaches a predetermined depth, the auger head 3 portion is bent and expanded to a required hole diameter d width (right figure in FIG. 1). A ground improvement method is described in which a large-diameter bulb hole is drilled in the ground and a ground layer having a strong bearing force is built by rotating and excavating the ground by bending and expanding the head 3.

Japanese Patent No. 3697348 JP-A-7-71033

In the method according to Patent Document 1 described above, since only a circular cross section can be constructed, it is difficult to construct a cross section in which ribs are provided on the wall as described above (FIG. 9B), and the diameter expansion width is also limited.
Further, in the digging hole device of Patent Document 2, a part of the auger head 3 is supported by a hinge 6 below the casing 1 and the other is expanded and contracted by a movable rod such as a hydraulic jack 7, and only the auger head 3 at the tip is provided. Is bent at an inclination angle within a certain range with respect to the casing 1 axis, and the casing 1 as a whole cannot be inclined greatly. Therefore, even if a large bulb portion can be created immediately below the vertical pile hole, an improved pile cannot be created in an oblique direction with a desired angle as shown in FIG. 9C. Construction of a cross section provided with ribs is also difficult.
The purpose of the present invention is to improve the mechanical ground by rotating the excavator and agitator in a desired angle and direction, so that a desired cross-sectional shape can be obtained in all directions such as diameter expansion in the ground and improvement resistance bent in the ground. The object is to provide an omnidirectional ground improvement method using a mechanical stirring deep mixing method and an omnidirectional ground improvement device suitable for it, which can create ground improvement piles and ground improvement bodies, and have excellent workability and economy. .
The object of the present invention is also suitable for construction in a narrow area (narrow area), realizes construction under an existing structure, can be applied to seismic reinforcement of the existing structure, etc., and is excellent in convenience. An object of the present invention is to provide an omnidirectional ground improvement method using an agitated deep mixing method and an omnidirectional ground improvement device suitable for it.

As a means for solving the above-mentioned problem, the omnidirectional ground improvement method using the mechanical stirring deep mixing method according to the invention described in claim 1 is a method in which the excavation stirring device attached to the lower end of the rod is placed in the soft ground. In addition to excavating and penetrating into the ground, a stable material is discharged by penetrating discharge or lifting discharge, and stirring and mixing with the in-situ soil to create a ground improvement pile or ground improvement body in the desired range in all directions. A processing method,
The excavating and stirring device is installed at the lower end of the rotating device, and the upper end of the rotating device is attached to the lower end of the rod. The ground improvement pile or the ground improvement body having a desired shape is formed in a desired range by performing a stirring deep layer mixing process.

The omnidirectional ground improvement method using the mechanical stirring deep layer mixing method according to the invention described in claim 2 allows the excavation and stirring device attached to the lower end of the rod to be excavated and penetrated into the soft ground, It is a mechanical agitated deep mixing method that discharges a stabilizer by pulling up and agitates and mixes with the original soil to create a ground improvement pile or ground improvement body in the desired range in all directions,
The excavating and stirring device is installed at the lower end of a vertical rotating body that is a rotating device that is connected to a horizontal shaft portion and has a vertical portion that is rotatable on a vertical surface, and the upper end of the vertical rotating body is attached to the lower end of a rod. If necessary, the excavating and stirring device is tilted in the desired direction of the vertical surface by the vertical rotating body, and the mixing depth mixing process is performed to create a ground improvement pile or a ground improvement body having a desired shape within a desired range. Features.

The omnidirectional ground improvement method using the mechanical stirring deep layer mixing method according to the invention described in claim 3 allows the excavation stirring device attached to the lower end of the rod to be excavated and penetrated into the soft ground, It is a mechanical agitated deep mixing method that discharges a stabilizer by pulling up and agitates and mixes with the original soil to create a ground improvement pile or ground improvement body in the desired range in all directions,
A vertical rotating body that is connected to the horizontal shaft portion and has a vertical portion that is rotatable on a vertical surface is installed at the lower end of a horizontal rotating body that is pivotally supported by the vertical shaft portion and has a horizontal portion that is rotatable on a horizontal plane. The excavator stirring device is installed at the lower end of the rotating device, and the upper end of the rotating device is attached to the lower end of the rod, and if necessary, the rotating device tilts the excavated stirring device in the desired direction of the vertical plane. And rotating in a desired direction on a horizontal plane, and performing a stirring depth mixing process to form a ground improvement pile or a ground improvement body having a desired shape in a desired range in all directions.

  The omnidirectional ground improvement method using the mechanical stirring depth mixing processing method according to the invention described in claim 4 is such that the upper end of the rotating device having the excavating stirring device installed at the lower end is the lower end of the backhoe arm instead of the rod. It is characterized by being attached to.

The omnidirectional ground improvement device according to the invention described in claim 5 is excavated and penetrated into the soft ground, and a stable material is ejected by intrusion discharge or uplift discharge, and is agitated and mixed with the in-situ soil, and omnidirectional An omnidirectional ground improvement device used in a mechanical stirring deep mixing method for creating a ground improvement pile or ground improvement body in a desired range of
A drilling and stirring device is installed at the lower end of the vertical rotating body, which is a rotating device connected to the horizontal shaft portion and having a vertical portion that is rotatable on the vertical plane, and the upper end of the vertical rotating body is attached to the lower end of the rod or backhoe arm. The excavating and stirring device is tilted in a desired direction on the vertical plane as necessary, and a ground improvement pile or a ground improvement body having a desired shape is formed in a desired range.

The omnidirectional ground improvement device according to the invention described in claim 6 is excavated and penetrated into the soft ground, and the stable material is ejected by the intrusion discharge or the uplift discharge, and is agitated and mixed with the in-situ soil. An omnidirectional ground improvement device used in a mechanical stirring deep mixing method for creating a ground improvement pile or ground improvement body in a desired range of
A vertical rotating body that is connected to the horizontal shaft portion and has a vertical portion that is rotatable on a vertical surface is installed at the lower end of a horizontal rotating body that is pivotally supported by the vertical shaft portion and has a horizontal portion that is rotatable on a horizontal plane. An excavator and agitation device is installed at the lower end of the vertical portion of the rotating device, and the upper end of the vertical shaft portion can be freely attached to the lower end of the rod or backhoe arm. The structure is characterized in that the ground improvement pile or the ground improvement body having a desired shape is formed in a desired range in all directions while being inclined in a desired direction and rotated in a desired direction on a horizontal plane.

  The omnidirectional ground improvement device according to the invention described in claim 7 is characterized in that the excavating and stirring device is a hydraulic auger or an electric auger.

  According to the omnidirectional ground improvement method and the omnidirectional ground improvement device using the mechanical stirring depth mixing method according to the present invention, the excavation and stirring device can be tilted and rotated in a desired direction by the rotating device, so that it can freely move in all directions. A ground improvement pile (ground improvement body) with a simple cross-sectional shape can be constructed efficiently, contributing to cost reduction. For example, it is possible to rationally implement lattice walls with improved lattice shapes and under existing structures, suitable for construction in narrow areas (narrow areas), and can be applied to seismic reinforcement of existing structures. Very good.

It is the schematic which showed the important process of the omnidirectional ground improvement construction method using the mechanical stirring deep layer mixing processing method by the omnidirectional ground improvement apparatus which concerns on this invention. FIG. 2 is an overall view showing a different embodiment of FIG. 1. A is a plan view showing a so-called long type omnidirectional ground improvement device, B is a front view thereof, and C is a development view thereof. A is an elevation view showing how to use a so-called short type omnidirectional ground improvement device, and B is a perspective view showing different rotating devices installed in the omnidirectional ground improvement device. AC is explanatory drawing which showed roughly the construction point of the omnidirectional ground improvement construction method. FIGS. 6A and 6B are explanatory diagrams schematically showing a process following FIG. It is explanatory drawing which showed roughly the construction point of the inclined ground improvement body. AC is explanatory drawing which showed roughly the construction point of the ground improvement body which provided the rib. AC is explanatory drawing which illustrated schematically the various improvement piles or improvement bodies constructed | assembled by the omnidirectional ground improvement construction method. It is the elevation which showed a different Example.

Next, an embodiment of an omnidirectional ground improvement method using the mechanical stirring depth mixing method according to the present invention and an omnidirectional ground improvement device suitable for the method will be described with reference to the drawings.
This omnidirectional ground improvement method allows excavation and agitation device 6 appropriately attached to the lower end of arm 70 of rod 1 or backhoe 7 to be excavated and penetrated into soft ground 2 and also used for cement milk or the like by intrusion discharge or uplift discharge. Suitable for mechanical agitation deep mixing process that discharges a stabilizer (not shown), mixes with in-situ soil, and creates ground improvement pile A or ground improvement body B in the desired range in all directions To be implemented.

FIG. 1 and FIG. 2 are important process diagrams of the omnidirectional ground improvement method using the omnidirectional ground improvement device. The configuration of the omnidirectional ground improvement device will be described with reference to FIG.
In this omnidirectional ground improvement device, a vertical rotating body 3 as a rotating device is installed on the upper part of the excavating and stirring device 6. The vertical rotating body 3 is based on the type shown in FIGS. 3 and 4A (hereinafter sometimes referred to as a two-dimensional type). This two-dimensional type vertical rotating body 3 is connected to a horizontal shaft portion 30, and left and right vertical portions 31 and 31 via bearings that are rotatable on a vertical surface on both sides of the horizontal shaft portion 30 are arranged vertically. It is the structure supported by the support parts 32 and 32. FIG. The left and right vertical portions 31 and 31 can rotate 90 degrees on the left and right on the vertical plane, respectively, and rotate at a desired angle in a range of 180 degrees at the maximum. The lower ends of the vertical portions 31, 31 are connected to a horizontal plate-like lower surface portion 34, and an excavating and stirring device 6 described later is connected to the lower surface of the lower surface portion 34.
On the other hand, the upper ends of the support portions 32, 32 are connected to a horizontal disk-shaped upper surface portion 33, and a shaft portion 50 protruding upward is provided at the center of the upper surface portion 33. The height of the vertical rotating body 3 is about 0.5 m as an example in the present embodiment. The shaft portion 50 can be appropriately attached to a rod 1 and an arm 70 of the backhoe 7 described later (see FIG. 4A).

Moreover, the form which applies the rotation apparatus 5 of the type (henceforth a three-dimensional type) as shown to FIG. 4B to an omnidirectional ground improvement apparatus is also implemented suitably.
In other words, this omnidirectional ground improvement device has the vertical rotation described above at the lower end of the horizontal portion 41 of the horizontal rotating body 4 provided with the horizontal portion 41 that is supported by the vertical shaft portion 40 and is rotatable on a horizontal plane. In this configuration, the upper ends of the vertical portions 32 and 32 of the body 3 are connected. A shaft portion 50 is protruded from the vertical shaft portion 40 (see FIG. 4A), and the rotation device 5 can be appropriately attached to the arm 70 of the rod 1 or the backhoe 7 by the shaft portion 50 as in the two-dimensional type. Become.
Therefore, according to this three-dimensional type rotating device 5, the excavating and stirring device 6 to be described later is tilted in the range of 180 degrees at the maximum by the vertical portion 31 of the vertical rotating body 3 on the vertical plane, and the horizontal rotating body on the horizontal plane. The four horizontal portions 41 can be rotated in a range of 360 degrees, and free three-dimensional ground improvement can be performed by a combination of the inclination angle and the rotation angle.

Next, the excavating and stirring device 6 connected to the lower end of the rotating device 5 will be described. In this embodiment, the excavating and stirring device 6 is implemented by a hydraulic auger. For example, the hydraulic auger 6 includes a motor and is configured to operate by receiving hydraulic pressure from a hydraulic device provided in the backhoe 7. It can be similarly implemented by using an electric auger instead of the hydraulic auger.
As shown in FIG. 3, the excavating and agitating device 6 includes an inner cylinder 60 and an outer cylinder 61 having a height of about 2 m. The inner cylinder 60 is installed on the lower surface portion 34 at the lower end of the rotating device 5 described above. Yes. A stirring blade 63 is attached to the outer peripheral surface 62 of the rotating outer cylinder 61, and a long-type spiral excavation body 64 (for example, about 1 m in height) having a tip excavation bit 65 at the lower end of the outer peripheral surface 62. ) Is attached.
Specifically, in the figure, reference numeral 66 denotes a cement milk discharge port, reference numeral 67 denotes an intermediate discharge port for cement milk, reference numeral 68 denotes a cement milk connection port, a switching portion for normal discharge and downward discharge, and reference numeral 69 denotes a hydraulic pipe. ing.
FIG. 4 shows a short type (as an example, a height of about 40 cm) of the excavated body 64 at the tip of the excavating and agitating device 6 of FIG. 3, and other configurations are the same as the long type of FIG. 3 ( Detailed description is omitted).

Therefore, according to the above-described two-dimensional type omnidirectional ground improvement device, as shown in FIG. 1, only by installing the upper end of the vertical rotating body (rotating device) 3 having the above-described configuration at the lower end of the rod 1, The vertical rotating body 3 can construct the ground improvement pile A having a desired shape as illustrated in FIG. 9 by inclining the excavating and stirring device 6 in the desired direction S on the vertical surface as necessary.
Moreover, according to the omnidirectional ground improvement device provided with the three-dimensional type rotating device 5 described above, the rotating device 5 causes the excavating and stirring device 6 to incline in the desired direction S of the vertical plane as necessary, and in the horizontal plane. The ground improvement body B (or ground improvement pile A) rotated in a desired T direction and having a desired shape can be created in a desired range in all directions. For example, the ground improvement body B as shown in FIGS. 6-8 can be created.
As shown in FIG. 1, the rotating device 5 can be directly attached to the arm 70 of the backhoe 7 in addition to installing the rotating device 5 on the rod 1 attached to the arm 70 of the backhoe 7. Moreover, the upper end of the rotation device 5 of the omnidirectional ground improvement device can be attached to the lower end of the rod 1 operated by a stationary boring machine (base machine) 8 as shown in FIG. In addition, the boring machine can be similarly implemented not only as a stationary type but also as a movable type capable of traveling on a laying rail. In particular, when building a wall-like ground improvement body, a movable type that can move regularly is preferable.

Hereinafter, the Example of the omnidirectional ground improvement construction method by the omnidirectional ground improvement apparatus especially provided with the three-dimensional type rotation apparatus 5 is demonstrated using FIGS. It should be noted that the procedure described below is merely an example, just in case.
As shown in FIG. 5A, after inserting the hydraulic auger (excavation stirrer) 6 substantially vertically into the ground, the hydraulic auger 6 is inclined 90 degrees on the vertical plane by the rotating device 5 (FIG. 5B). After that, as shown in FIG. 5C, the hydraulic auger 6 is rotated 360 degrees in the T direction in the horizontal plane to improve the ground, and a ground improvement body B having a circular shape in plan view is formed. As the horizontal T-direction rotating means, the horizontal rotating body 4 of the rotating device 5 may be used. However, it can also be performed by rotating the rod 1.
Next, as shown in FIG. 6A, the position of the hydraulic auger 6 is sequentially lowered, and by repeating the ground improvement work of rotating 360 degrees on the horizontal plane as shown in FIG. 5C, the cylindrical ground improvement is performed. Body B can be created. Thus, the improved body B with a large cross section can be created by the small omnidirectional ground improvement device.
In addition, as shown to FIG. 6B, by setting and constructing the depth which performs the ground improvement work rotated 360 degree | times on the horizontal surface of the said FIG. It is also possible to create an improved body B that alternately forms.

FIG. 7 shows a construction example of an inclined ground improvement body.
The rod 1 is inserted into the ground in an inclined state, and the hydraulic auger 6 is inclined 90 degrees by the rotating device 5 (see FIGS. 5A and 5B). In such a state, large-scale ground improvement with a diagonal two-dimensional cross section can be performed.
In order to improve the ground with a three-dimensional cross section, if the hydraulic auger 6 is further rotated 360 degrees in a horizontal plane and is constructed as shown in FIG. 5B, an oblique ground improvement body B with a large cross section can be created. The 360-degree rotation of the horizontal plane may be performed using the rotating device 5 as described above, but may be performed by rotating the rod 1.

FIG. 8 shows a construction example in which ribs are provided on the underground wall (including a grid-like improvement wall).
The rod 1 (not shown) is inserted substantially vertically into the ground, and the ground is improved as it is (see FIG. 5A). When the predetermined depth is reached, the hydraulic auger 6 is inclined 90 degrees by the rotating device 5 (see FIG. 5B) to improve the ground. Thereafter, the hydraulic auger 6 is returned to the original substantially vertical state by the rotating device 5 to improve the ground. The cross section is shown in FIG. 8B. The cross section taken along the line II in FIG. 8A is a ground improvement in a narrow range. Thereafter, the hydraulic auger 6 is inclined 90 degrees by the rotating device 5 to improve the ground. The cross section is shown in FIG. 8C, which is a wide range of ground improvement in the II-II cross section in FIG. 8A. In this way, by performing the ground improvement in a state where the hydraulic auger 6 is inclined 90 degrees by the rotating device 5 and the case of performing the ground improvement in a substantially vertical state alternately, the rib C is formed at a predetermined depth. The provided underground wall (improved body B) can be created (FIG. 8A).

The embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the illustrated examples, and variations of design changes and application that a person skilled in the art normally performs without departing from the technical idea thereof. Note that it includes the range.
For example, with respect to the vertical rotating body 3 used for the two-dimensional type and the three-dimensional type, in the above embodiment, the horizontal shaft portion 30 and the vertical portion 31 are joined by a (ball) bearing type, but the invention is not limited to this. As shown in FIG. 10, it can be implemented by a gear type 15. In addition, the code | symbol 16 in FIG. 10 has shown the Example from which the said excavation stirring apparatus 6 differs. Thus, the form of the excavation and stirring device is not particularly limited, and the versatility of the present invention is high, such as the conventional excavation and stirring device that is generally used (no operating part is mounted).

DESCRIPTION OF SYMBOLS 1 Rod 2 Soft ground 3 Vertical rotator 30 Horizontal shaft part 31 Vertical part 4 Horizontal rotator 40 Vertical shaft part 41 Horizontal part 5 Rotating device 50 Shaft part 6 Excavation stirring apparatus 60 Inner cylinder 61 Outer cylinder 62 Outer surface 63 Stir blade 64 Excavated body 7 Backhoe 70 Arm A Ground improvement pile B Ground improvement body S Desired direction T Desired direction

The present invention relates to a ground plate improved method and earth plate improved apparatus and, more, a stable material and in situ soil cement stirred and mixed to the processor to construct a ground improvement pile or soil improvement material, soft using a mechanical stirrer deep mixing method to improve by solidifying a raw soil, belongs to the technical field of suitable land Release modifying apparatus of ground improvement and its row cormorants land Release improved method in the range of Nozomu Tokoro the original ground .
In addition, in this specification, the above-mentioned “ground improvement pile” is a vertical pile with a circular cross section, a pile with a node, or a pile with a special shape formed by expanding or tilting a part (an irregular shape). The “soil improvement body” refers to a structure in which the ground improvement pile is continuously formed in one direction and formed into a wall shape.

The cross section of the ground improvement pile constructed by the mechanical deep mixing method is circular and constant in the depth direction. For example, in the case of liquefaction countermeasures using the grid-like ground improvement method, the stress is most severe in the deep part, but the cross-section cannot be changed in the depth direction. It is not possible to construct a wall with a large cross section (expanded diameter).
In order to enlarge the cross section only in the deep part, it is necessary to construct two rows of improved piles. However, for that purpose, it is necessary to carry out the construction in the shallow part, which is uneconomical. Although the compressive strength of the ground improvement body is high, the tensile strength can be expected only about 10 to 15% of the compressive strength. In addition, since an upper limit is set for the tensile strength, the allowable tensile stress does not increase no matter how much the compressive strength is increased. If the tensile stress becomes a critical stress, the cross section is enlarged to cope with it. However, it is uneconomical. In such a case, as shown in FIG. 9B, if it is possible to construct a cross section provided with ribs, it is not necessary to place extra piles for improvement, leading to cost reduction. Moreover, if a direction can be changed in the ground as shown in FIG. 9C by the construction of the mechanical improved pile , it can be used for seismic reinforcement of the existing structure.

On the other hand, when the jet stirring method is used, it is possible to change the cross section in the ground by changing the discharge pressure of cement milk and the rotation speed of the rod. However, in the injection type agitation method, there is no guarantee that an improved pile of a predetermined shape is made in the ground, and the reliability for construction is low. On the other hand, if the mechanical type is improved, the portion through which the stirring blade has passed is definitely improved, so that the reliability of the work on the finished shape is high.

In the method according to Patent Document 1 described above, since only a circular cross section can be constructed, it is difficult to construct a cross section in which ribs are provided on the wall as described above (FIG. 9B), and the diameter expansion width is also limited.
Also, the Juana device of Patent Document 2, a portion of the auger head 3 and the support shaft by a hinge 6 of the lower casing 1, to extend and retract the other movable扞such as a hydraulic jack 7, auger head 3 of the distal end Only the case 1 is bent at a certain range of inclination angle with respect to the casing 1 axis, and the entire casing 1 is not structured to be greatly inclined. Therefore, even if a large bulb portion can be created immediately below the vertical pile hole, an improved pile cannot be created in an oblique direction with a desired angle as shown in FIG. 9C. Construction of a cross section provided with ribs is also difficult.
An object of the present invention, by a mechanical ground improvement for performing excavating stirrer rotated at a desired angle and direction, and enlarged in the ground, improved pile, etc. Nozomu Tokoro sectional shape bent in the ground soil can construct a improved pile and soil improvement material, workability, excellent economic efficiency, it is to provide an earth plate improved method and a suitable ground Release modifying apparatus thereto using a mechanical stirrer deep mixing method.
The object of the present invention is also suitable for construction in a narrow area (narrow area), realizes construction under an existing structure, can be applied to seismic reinforcement of the existing structure, etc., and is excellent in convenience. It is to provide an earth plate improved method and a suitable ground Release modifying apparatus thereto with stirring deep mixing method.

As a means for solving the above problems, the earth plate improved method using a mechanical stirrer Deep Mixing method according to the invention described in claim 1, drilling stirring device which is mounted via a rotation device at the lower end of the rod and causes penetrate into soft in the ground while excavating the soft ground, to eject a stable material by penetration discharge or pulling discharge, to construct a ground plate improved pile or soil improvement material is stirred and mixed with the original position soil machinery A method of mixing deep mixing process,
The rotating device is a vertical rotating body including a horizontal shaft portion and left and right vertical portions that are connected to both ends of the horizontal shaft portion and are rotatable on a vertical surface , and the left and right vertical portions are vertical surfaces. Rotating 90 degrees left and right and rotating in a range of 180 degrees at the maximum , the upper end of the vertical rotating body is connected to the lower end of the rod, and the left and right vertical parts of the vertical rotating body are connected to the excavating and stirring device And
Tilting the said drilling stirring device by the vertical portion of the right and left front Symbol vertical rotation body in the desired direction of the vertical plane in the range of rotation of the up to 180 degrees, stirring is carried out for Deep Mixing, ground improvement pile or ground of a desired shape The improved body is formed in a desired range.

Land Release improvement method using a mechanical stirrer Deep Mixing method according to the invention described in claim 2, drilling stirring device which is mounted via a rotation device at the lower end of the rod, soft while drilling soft soil ground together to penetrate into, discharged and stable material by penetration discharge or pulling discharge, a mechanical stirrer deep mixing method to construct a ground plate improved pile or soil improvement material is stirred and mixed with the original position soil,
The rotating device is a combination of a vertical rotating body and a horizontal rotating body,
The vertical rotating body includes a horizontal shaft portion and left and right vertical portions that are connected to both ends of the horizontal shaft portion and are rotatable on a vertical surface. The left and right vertical portions rotate 90 degrees left and right on the vertical surface. In a configuration that rotates within a range of 180 degrees at the maximum, the upper end of the vertical rotating body is connected to the horizontal rotating body, the left and right vertical parts of the vertical rotating body are connected to the excavation and stirring device,
The horizontal rotating body includes a vertical shaft portion and a horizontal portion that is pivotally supported by the vertical shaft portion and is rotatable within a range of 360 degrees in a horizontal plane, and connects the horizontal portion of the horizontal rotating body to the vertical rotating body. And connecting the vertical shaft portion of the horizontal rotating body to the lower end of the rod ,
With tilting the digging stirring device in the desired direction of the vertical plane in the range of rotation of the up to 180 degrees by said left and right vertical portions of the vertical rotation body before Symbol rotating device, the horizontal of the horizontal rotary member of the rotary device The excavating and agitating device is rotated in a desired direction on a horizontal plane by a section, and a stirring depth mixing process is performed to create a ground improvement pile or a ground improvement body having a desired shape within a desired range.

Land Release improvement method using a mechanical stirrer Deep Mixing method according to the invention described in claim 3, wherein the rotary device is characterized in that attached to the lower end of the rod to the cash forte, backhoe arm.

Engaging Ru land Release improved method to the invention as set forth in claim 4, soft soil is penetrated into soft in the ground while excavating the stable material is discharged by the penetration discharge or pulling discharge, stirred and mixed to the original position soil Te, a ground plate improved apparatus that is used in mechanical stirrer deep mixing method to construct a ground plate improved pile or soil improvement material,
The ground improvement device comprises a rotating device and an excavating and stirring device,
The rotating device is a vertical rotating body including a horizontal shaft portion and left and right vertical portions that are connected to both ends of the horizontal shaft portion and are rotatable on a vertical surface , and the left and right vertical portions are vertical surfaces. configuration rotated in a range of up to 180 degrees and rotated by the left and right 90 degrees, wherein the left and right of the vertical rotation body is connected to the drilling stirring device to the vertical portion, the vertical rotary body upper rod or backhoe arm Can be attached to the lower end,
The excavating and stirring device is tilted in the desired direction of the vertical plane within the range of rotation of the maximum 180 degrees by the left and right vertical portions of the vertical rotating body, and a ground improvement pile or a ground improvement body having a desired shape is formed in the desired range. It is the structure which is characterized by the above-mentioned.

Engaging Ru land Release improved method to the invention as set forth in claim 5, soft soil is penetrated into soft in the ground while excavating the stable material is discharged by the penetration discharge or pulling discharge, stirred and mixed to the original position soil Te, a ground plate improved apparatus that is used in mechanical stirrer deep mixing method to construct a ground plate improved pile or soil improvement material,
The ground improvement device is composed of a rotating device and an excavating and stirring device, and the rotating device is a combination of a vertical rotating body and a horizontal rotating body,
The vertical rotating body includes a horizontal shaft portion and left and right vertical portions that are connected to both ends of the horizontal shaft portion and are rotatable on a vertical surface. The left and right vertical portions rotate 90 degrees left and right on the vertical surface. In the configuration that rotates in a range of 180 degrees at the maximum, the upper end of the vertical rotating body is connected to the horizontal rotating body, the excavation and stirring device is connected to the left and right vertical parts of the vertical rotating body ,
The horizontal rotating body includes a vertical shaft portion and a horizontal portion that is pivotally supported by the vertical shaft portion and is rotatable in a range of 360 degrees on a horizontal plane, and the horizontal portion of the horizontal rotating body is connected to the vertical rotating body. The vertical shaft portion of the horizontal rotating body is freely attachable to the lower end of a rod or a backhoe arm,
The left and right vertical portions of the vertical rotating body of the rotating device tilt the excavating and stirring device in a desired direction on the vertical plane within the range of rotation of the maximum 180 degrees, and the horizontal rotating body of the rotating device is horizontally the drilling stirring device by section is rotated in the desired direction of the horizontal plane, and wherein the ground improvement pile or soil improvement material having a desired shape is configured to be reclamation to a Nozomu Tokoro range.

Engaging Ru land Release improved method to the invention as set forth in claim 6, characterized in that soil improvement apparatus Ioite according to claim 4 or 5, wherein the drilling stirring device is a hydraulic auger, or an electric auger.

According to the earth board improved method and earth plate improved apparatus using a mechanical stirrer Deep Mixing method according to the present invention, the drilling stirrer is inclined and rotating in the desired direction by rotating device, the freedom of the cross-sectional shape The improved ground pile (ground improvement body) can be constructed efficiently, contributing to cost reduction. For example, it is possible to rationally implement lattice walls with improved lattice shapes and under existing structures, suitable for construction in narrow areas (narrow areas), and can be applied to seismic reinforcement of existing structures. Very good.

The present invention is a schematic diagram showing a pivotal step of the earth plate improved method using a mechanical stirrer Deep Mixing Method according engagement Ru land Release modifying apparatus. FIG. 2 is an overall view showing a different embodiment of FIG. 1. A is a plan view showing a ground plate improved apparatus of the so-called long type, B is a front view thereof, C is a similar exploded view. A is an elevational view illustrating the use of the ground plate modifying apparatus of a so-called short type, B is a perspective view illustrating a different rotary devices installed on the ground board improved apparatus A. A~C is an explanatory view schematically showing the construction procedure of the earth plate improved method. FIGS. 6A and 6B are explanatory diagrams schematically showing a process following FIG. It is explanatory drawing which showed roughly the construction point of the inclined ground improvement body. AC is explanatory drawing which showed roughly the construction point of the ground improvement body which provided the rib. A~C is an explanatory view schematically showing various improvements pile or improved body is reclamation in the land board improved method. It is the elevation which showed a different Example.

Then, the earth plate improved method using a mechanical stirrer Deep Mixing method according to the present invention will be described with reference to the drawings an embodiment of a suitable land Release modifying apparatus in the method.
Land Release improvement method of this are the drilling stirrer 6 mounted properly to the lower end of the arm 70 of the rod 1 and backhoe 7, dissipate penetrate into soft in the ground while excavating the soft ground 2, penetration discharge or pulling discharge stable material such as cement milk (not shown) is ejected, and stirred and mixed with the original position soil, to a Nozomu Tokoro range, mechanical stirrer deep mixing method to construct a ground improvement pile a and soil improvement material B Is preferably implemented.

Figure 1 and Figure 2 is a pivotal step diagram of that by the land board improved apparatus ground board improvement method. The configuration of this 該地 Release modifying apparatus will be described focusing on Figure 3.
Land Release modifying apparatus of this is serving rotator vertical rotation body 3 is installed on the top of the excavation stirrer 6. The vertical rotating body 3 is based on the type shown in FIGS. 3 and 4A (hereinafter sometimes referred to as a two-dimensional type). This two-dimensional type vertical rotating body 3 is connected to a horizontal shaft portion 30, and left and right vertical portions 31 and 31 via bearings that are rotatable on a vertical surface on both sides of the horizontal shaft portion 30 are arranged vertically. It is the structure supported by the support parts 32 and 32. FIG. The left and right vertical portions 31 and 31 can rotate 90 degrees on the left and right on the vertical plane, respectively, and rotate at a desired angle in a range of 180 degrees at the maximum. The lower ends of the vertical portions 31, 31 are connected to a horizontal plate-like lower surface portion 34, and an excavating and stirring device 6 described later is connected to the lower surface of the lower surface portion 34.
On the other hand, the upper ends of the support portions 32, 32 are connected to a horizontal disk-shaped upper surface portion 33, and a shaft portion 50 protruding upward is provided at the center of the upper surface portion 33. The height of the vertical rotating body 3 is about 0.5 m as an example in the present embodiment. The shaft portion 50 can be appropriately attached to a rod 1 and an arm 70 of the backhoe 7 described later (see FIG. 4A).

Also, the type shown in FIG. 4B (hereinafter also referred to as 3-dimensional type.) Forms of applying the rotating device 5 on the ground board improved apparatus may be suitably implemented.
That is, the ground plate modifying apparatus this is the lower end of the horizontal portion 41 of the horizontal rotary member 4 having a horizontal portion 41 through the rotatable bearings is supported by a vertical shaft 40 horizontal, vertical rotation described above In this configuration, the upper ends of the vertical portions 32 and 32 of the body 3 are connected. A shaft portion 50 is protruded from the vertical shaft portion 40 (see FIG. 4A), and the rotation device 5 can be appropriately attached to the arm 70 of the rod 1 or the backhoe 7 by the shaft portion 50 as in the two-dimensional type. Become.
Therefore, according to the rotating device 5 of the three-dimensional type, drilling stirrer 6 which will be described later, it is inclined in a range of up to 180 degrees by the vertical portion 31 of the vertical rotation body 3 in a vertical plane Rutotomoni, horizontal rotation in a horizontal plane the horizontal portion 41 of the body 4 can Rukoto rotated in a range of 360 degrees, it is possible to perform a free 3-dimensional ground improvement in combination with their tilt angle rotation angle.

Therefore, according to the earth board improved apparatus of the two-dimensional type described above, as shown in FIG. 1, a vertical rotating body (rotating apparatus) 3 of the upper end of the structure only be installed in the lower end of the rod 1, the vertical The rotary body 3 can be used to construct the ground improvement pile A having a desired shape as illustrated in FIG. 9 by inclining the excavating and stirring device 6 in the desired direction S on the vertical surface as necessary.
Further, according to the earth board improved apparatus equipped with a rotating device 5 of the three-dimensional type described above, optionally with tilting of the drilling stirrer 6 in the desired direction S of the vertical plane by the rotating device 5, a desired in the horizontal plane rotate the T-direction, a desired shape of the soil improvement material B (or ground improvement pile a), can be reclamation to a Nozomu Tokoro range. For example, the ground improvement body B as shown in FIGS. 6-8 can be created.
As shown in FIG. 1, the rotating device 5 can be directly attached to the arm 70 of the backhoe 7 in addition to installing the rotating device 5 on the rod 1 attached to the arm 70 of the backhoe 7. Further, the lower end of the rod 1 to operate in stationary boring machines (base machine) 8 as shown in FIG. 2, can also be performed by attaching an upper end of the rotating device 5 of the earth board improvement device. In addition, the boring machine can be similarly implemented not only as a stationary type but also as a movable type capable of traveling on a laying rail. In particular, when building a wall-like ground improvement body, a movable type that can move regularly is preferable.

Hereinafter, with reference to FIGS, particularly described embodiment of the by that the earth plate improved method to the earth board improved apparatus equipped with a rotating device 5 of the three-dimensional type. It should be noted that the procedure described below is merely an example, just in case.
As shown in FIG. 5A, after inserting the hydraulic auger (excavation stirrer) 6 substantially vertically into the ground, the hydraulic auger 6 is inclined 90 degrees on the vertical plane by the rotating device 5 (FIG. 5B). After that, as shown in FIG. 5C, the hydraulic auger 6 is rotated 360 degrees in the T direction in the horizontal plane to improve the ground, and a ground improvement body B having a circular shape in plan view is formed. As the horizontal T-direction rotating means, the horizontal rotating body 4 of the rotating device 5 may be used. However, it can also be performed by rotating the rod 1.
Next, as shown in FIG. 6A, the position of the hydraulic auger 6 is sequentially lowered, and by repeating the ground improvement work of rotating 360 degrees on the horizontal plane as shown in FIG. 5C, the cylindrical ground improvement is performed. Body B can be created. This way the size of the earth plate modifying apparatus, it is possible to construct a improved material B having a large cross-section.
In addition, as shown to FIG. 6B, by setting and constructing the depth which performs the ground improvement work rotated 360 degree | times on the horizontal surface of the said FIG. It is also possible to create an improved body B that alternately forms.

Claims (7)

The excavator and agitation device attached to the lower end of the rod is excavated and penetrated into the soft ground, and the stabilizing material is ejected by penetrating discharge or pulling up and discharged to the desired range in all directions by stirring and mixing with the original soil. It is a mechanical stirring deep mixing treatment method for creating an improved pile or ground improvement body,
The excavating and stirring device is installed at the lower end of the rotating device, and the upper end of the rotating device is attached to the lower end of the rod. The omnidirectional ground improvement method using the mechanical stirring depth mixing method is characterized in that the ground improvement pile or ground improvement body having a desired shape is formed in a desired range by rotating the mixture to a desired depth. The excavator and agitation device attached to the lower end of the rod is excavated and penetrated into the soft ground, and the stabilizing material is ejected by penetrating discharge or pulling up and discharged to the desired range in all directions by stirring and mixing with the original soil. It is a mechanical stirring deep mixing treatment method for creating an improved pile or ground improvement body,
The excavating and stirring device is installed at the lower end of a vertical rotating body that is a rotating device that is connected to a horizontal shaft portion and has a vertical portion that is rotatable on a vertical surface, and the upper end of the vertical rotating body is attached to the lower end of a rod. If necessary, the excavating and stirring device is tilted in the desired direction of the vertical surface by the vertical rotating body, and the mixing depth mixing process is performed to create a ground improvement pile or a ground improvement body having a desired shape within a desired range. An omnidirectional ground improvement method using a mechanical stirring deep mixing method. The excavator and agitation device attached to the lower end of the rod is excavated and penetrated into the soft ground, and the stabilizing material is ejected by penetrating discharge or pulling up and discharged to the desired range in all directions by stirring and mixing with the original soil. It is a mechanical stirring deep mixing treatment method for creating an improved pile or ground improvement body,
A vertical rotating body that is connected to the horizontal shaft portion and has a vertical portion that is rotatable on a vertical surface is installed at the lower end of a horizontal rotating body that is pivotally supported by the vertical shaft portion and has a horizontal portion that is rotatable on a horizontal plane. The excavator stirring device is installed at the lower end of the rotating device, and the upper end of the rotating device is attached to the lower end of the rod, and if necessary, the rotating device tilts the excavated stirring device in the desired direction of the vertical plane. And rotating in a desired direction on a horizontal plane, performing a stirring deep mixing process, and creating a ground improvement pile or ground improvement body having a desired shape in a desired range in all directions, a mechanical stirring deep mixing process method Omnidirectional ground improvement method using   The mechanical stirring deep mixing process according to any one of claims 1 to 3, wherein an upper end of a rotating device having a drilling stirring device at the lower end is attached to a lower end of a backhoe arm instead of a rod. Omni-directional ground improvement method using construction method. Mechanical type that excavates and penetrates into soft ground, stabilizes the material by intrusion discharge or pull-up discharge, and stirs and mixes with the original soil to create ground improvement piles or ground improvement bodies in the desired range in all directions It is an omnidirectional ground improvement device used in the stirring deep mixing method,
A drilling and stirring device is installed at the lower end of the vertical rotating body, which is a rotating device connected to the horizontal shaft portion and having a vertical portion that is rotatable on the vertical plane, and the upper end of the vertical rotating body is attached to the lower end of the rod or backhoe arm. The omnidirectional ground is characterized in that the excavating and stirring device is tilted in a desired direction on the vertical plane as necessary, and a ground improvement pile or ground improvement body having a desired shape is created in a desired range. Improved device. Mechanical type that excavates and penetrates into soft ground, stabilizes the material by intrusion discharge or pull-up discharge, and stirs and mixes with the original soil to create ground improvement piles or ground improvement bodies in the desired range in all directions It is an omnidirectional ground improvement device used in the stirring deep mixing method,
A vertical rotating body that is connected to the horizontal shaft portion and has a vertical portion that is rotatable on a vertical surface is installed at the lower end of a horizontal rotating body that is pivotally supported by the vertical shaft portion and has a horizontal portion that is rotatable on a horizontal plane. An excavator and agitation device is installed at the lower end of the vertical portion of the rotating device, and the upper end of the vertical shaft portion can be freely attached to the lower end of the rod or backhoe arm. An omnidirectional ground improvement device characterized in that the ground improvement pile or the ground improvement body having a desired shape is formed in a desired range in all directions while being inclined in a desired direction and rotated in a desired direction on a horizontal plane.   The omnidirectional ground improvement device according to claim 5 or 6, wherein the excavating and stirring device is a hydraulic auger or an electric auger.

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