JPH1193156A - Ground improving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a device and an equipment cost. SOLUTION: A ground improving device comprises a leader 5 erected at the front of a base machine 2; and three agitating shafts 6 supported in a manner to be rotated and elevated along the leader 5. The agitating shaft 6 is provided at a lower end part with an agitating vane 63. By lowering the agitating shaft with the agitating shaft 6 rotated, an excavated hole is formed in a ground and a ground improving material is fed in the excavated hole. The leader 5 is fixed at a base machine 2 such that the lower end part thereof is positioned in a level upper than that of the front end part of the base machine 2. A rotation drive means 8 is mounted on the base machine 2 in a position below the lower end part of the leader 5. The leader 5 is supported at the base machine 2 through a portal member 4. A drive motor 81 for a rotation drive means 8 disposed at a central part is disposed between the stays of the portal member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement apparatus for forming a drilling hole from the ground to the ground and injecting a ground improvement material into the drilling hole to improve the ground.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Laid-Open Publication No. 59-16368.
There is known a ground improvement device disclosed by Japanese Patent Publication No. 3 (JP-A) No. 3 (1998) -301. This ground improvement device is a self-propelled base machine, a support member protruding forward from a front portion of the base machine, and a vertically extending column mounted on the front side of the support member. A stirrer fixed to this reader, a stirrer shaft provided vertically penetrating through the stirrer, and provided with a stirrer at its lower end, mounted on the stall, and It is provided with a driving unit for driving the shaft to rotate around the axis, and a lifting unit for raising and lowering the stirring shaft.

[0003] By rotating the stirring shaft around the axis by the driving means and lowering it by the driving of the elevating means, the rotating stirring blade at the leading end excavates the soil.
As a result, an excavation hole is formed in the ground. When a drilling hole with a preset depth is formed, a ground improvement material such as ready-mixed concrete is injected into it,
Then, the stirring shaft is pulled upward while the rotation is continued, so that the soil improvement material is left in the excavation hole while being stirred. Usually, the gantry is provided with a plurality of stirring shafts, and a number of drive means corresponding to the number of stirring shafts are attached to the gantry.

[0004]

By the way, in the conventional ground improvement apparatus as described above, the driving means is interposed between the stirring shaft and the reader, so that the stirring shaft and the leader are not provided. The distance to the reader is longer by the interposition of the driving means. Therefore, in order to cope with the increased moment, it is necessary to make the support structure of the pedestal for the leader rugged, and as a result, the ground improvement device becomes generally heavy equipment, and the equipment cost increases accordingly. Had problems.

Further, since the distance between the stirring shaft and the leader is long, the distance from the driver's seat of the base machine to the stirring shaft is long, so that the driving operation can be performed in a state close to the construction position. There is also a problem that the erroneous operation can be easily performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the weight of the apparatus, thereby contributing to a reduction in equipment costs, and to improve the conventional equipment. Another object of the present invention is to provide a ground improvement device capable of performing work in a state close to a construction position, thereby preventing erroneous operation.

[0007]

According to a first aspect of the present invention, there is provided a ground improvement apparatus comprising: a leader erected on a front end of a base machine; And one or more stirring shafts supported by the reader so as to ascend and descend along the leader, the stirring shaft has a stirring blade at a lower end, and the stirring shaft is A ground improvement device configured to drill an excavation hole in the ground by rotating by the drive of the rotary drive unit and lowering by the drive of the elevation drive unit, and to feed a ground improvement material to the excavation hole. A connecting member for supporting the reader is provided at a front end of the base machine, the reader is provided upright on the connecting member, and the connecting member defines a storage space for storing the rotation driving means. And it is characterized in that it is.

According to this ground improvement apparatus, since the rotary driving means is mounted in the storage space of the connecting member and is mounted below the reader, interference between the rotary driving means and the reader is avoided. When the stirring shaft provided at the position in front of the driving means can be disposed closer to the reader, it is possible to arrange the rotary driving means and the stirring shaft sequentially in front of the reader as in the related art. The distance between the leader and the stirring shaft is shorter than that of, and the action of the moment is correspondingly reduced, so that the support structure of the stirring shaft can be simplified, which contributes to reduction of equipment cost. .

[0009] In addition, since the distance between the leader and the stirring shaft is shortened, it becomes possible for an operator operating the base machine to work closer to the work position than before. As a result, visual confirmation of the construction position can be performed more reliably, and as a result, erroneous operation of the base machine, such as excavation work at an incorrect construction position, can be avoided.

[0010] The ground improvement device according to claim 2 of the present invention comprises:
The ground improvement device according to claim 1, wherein the connecting member is formed by a portal member having two columns, and the storage space is formed between the columns.

According to this ground improvement device, the portal member is
The structural strength is excellent due to the two columns, the reader is reliably supported, and the rotation driving means is possible by disposing the rotation driving means between the two columns. As far as possible, it can be brought closer to the center of the base machine, whereby the stirring shaft on the tip side is brought closer to the reader.

A ground improvement device according to a third aspect of the present invention comprises:
3. The ground improvement device according to claim 1, wherein the plurality of stirring shafts are configured such that the distance between the respective shafts can be changed.

[0013] According to this ground improvement apparatus, by changing the center distance of the stirring shaft in accordance with the drilling pitch of the drilling hole set in advance, the drilling hole is drilled at the set position, and the drilling pitch is set. The degree of freedom increases.

[0014]

FIG. 1 is a side view showing an embodiment of a ground improvement apparatus according to the present invention. As shown in this figure, a ground improvement device 1 includes a base machine 2 that is configured to run freely, a leader base 3 provided at a front end of the base machine 2, and a gate standing on the leader base 3. A mold member (connecting member) 4, a leader 5 erected on the portal member 4, a stirring shaft 6 that moves up and down while rotating around the axis along the leader 5, and a top of the stirring shaft 6. It has a basic configuration including a provided thrust bearing structure 7, and rotary drive means 8 and lift drive means 9 for rotating and raising and lowering the stirring shaft 6.

The base machine 2 includes a machine body 21 having a driver's seat, a pair of crawlers 22 supporting the machine body 21 in the width direction (front and back directions on the paper surface of FIG. 1), and a front portion of the machine body 21 ( A deck 23 protruding forward from the right side of FIG. 1), and a pair of left and right deck arms 24 protruding from the deck 23 in the width direction.
And a pair of widthwise front legs 25 integrally attached to the distal ends of the deck arms 24 and a pair of widthwise rear legs 26 provided at the rear of the machine body 21. The machine body 21 includes driving means such as a diesel engine for driving the crawler 22 or a hydraulic mechanism (not shown), and moves or agitates the base machine 2 by the operation of an operator riding on the machine body 21. Excavation work is performed by raising and lowering the shaft 6 and rotating the shaft 6.

The front leg 25 is a movable front leg 25a composed of a hydraulic cylinder fixed to the deck arm 24 so as to extend in the vertical direction, and a piston rod protruding downward from the cylinder chamber of the fixed front leg 25a. And the front leg 25b.
Is a fixed rear leg 26a composed of a hydraulic cylinder fixed to the rear frame of the machine body 21 so as to extend in the vertical direction.
And a movable rear leg 26b composed of a piston rod protruding downward from the cylinder chamber of the fixed rear leg 26a.

When the base machine 2 travels, the movable legs 25b, 26b are immersed in the corresponding fixed legs 25a, 26a by the driving of the hydraulic mechanism, whereby the crawler 22 lands and the base machine 2 2 is placed at a predetermined excavation site and is used for excavation work, the movable legs 25b, 2 are moved from the fixed legs 25a, 26a to the movable legs 25b, 2a.
6b is projected so as to reliably support the base machine 2.

The reader base 3 is provided with a leader support shaft 2 mounted on the tip end of the deck portion 23 so as to extend in the width direction.
7 while being rotatably supported around the
A multi-stage cylinder device 28 is interposed between a substantially middle position in the up-down direction and a rear end position of the machine main body 21.
Rotates forward and backward about the leader support shaft 27, whereby the leader 5 stands upright on the deck portion 23 via the leader base 3 and the gate-shaped member 4, and a reclined posture lying on the machine body 21. The posture can be changed between.

The reader 5 has a pair of guides 51 extending in the vertical direction over substantially the entire length on the front surface thereof, while the thrust bearing structure 7 can be moved up and down while being guided by the guides 51. It is mounted on the guide 51.
Such a thrust bearing structure 7 has a top and a leader 5.
Of the thrust bearing structure 7 and the leader base 3 via a predetermined sheave while being lifted by the ascending wire rope 62 stretched through a predetermined sheave between the top of the thrust bearing structure 7 and the leader base 3. The lowering is performed by towing by the provided lowering wire rope 61. Each of the wire ropes 61 and 62 is towed or relaxed by the drive of an unillustrated elevating drive unit provided at an appropriate position of the reader base 3, the portal member 4, or the reader 5.

The stirring shaft 6 has a prismatic shape. In the present embodiment, these prismatic stirring shafts 6 are used.
Are used in three rows in the width direction. These stirring shafts 6 have their upper ends rotatably supported by the thrust bearing structure 7 about the axis thereof, and penetrate through a rotation transmitting member 84 to be described later so as to be movable up and down.
The rotation of the thrust bearing structure 7 around the axis of the thrust bearing structure 7 of the rotation transmitting member 84 by the driving of the rotation of the rotation transmitting member 84 can be performed.

Such a stirring shaft 6 has stirring blades 63 provided at the lower end thereof in two stages vertically and projected in the radial direction, and is rotated around the axis by the driving of the rotation driving means 8. Descent wire rope 61 driven by lifting drive means
As the stirring blade 63 rotates, the stirring blade 63 descends and excavates the ground B at the excavation position, so that an excavation hole is obtained. Ground improvement material such as ready-mixed concrete is supplied to the borehole from a ground improvement material supply means (not shown),
As a result, the shaved soil and the soil improvement material are mixed and stirred in the excavation hole, and a columnar soil improvement body is formed in the excavation hole with the stirring shaft 6 pulled out of the excavation hole. .

Hereinafter, the structure of the rotation drive means according to the present invention will be described with reference to FIGS. FIG. 2 is a perspective view showing one embodiment of the structure for disposing the rotation drive means, and FIG.
FIG. 4 is a sectional view of a main part in a side view, FIG. 4 is a front view of FIG.
FIG. 3 is a sectional view of a main part in plan view of FIG. 2. In FIG. 2, the XX direction is referred to as the width direction, the YY direction is referred to as the front-back direction, and in particular, the -X direction is referred to as the left, the + X direction is referred to the right, the -Y direction is referred to as the front, and the + Y direction is referred to as the rear.

As shown in these figures, the reader base 3 includes a base 30, a support plate 31 integrally provided on the base 30, and having a trapezoidal shape in plan view, and a support plate 31. A rectangular front frame 32 suspended from the front end of 31
Are formed.

On the other hand, the deck portion 23 is tapered so that the width decreases toward the tip, and a mounting groove 23a (FIG. 4) extending vertically is formed at the tip. The reader base 3 has a columnar body 29, and the columnar body 29 extends downward from the lower portion of the base 30, concentrically with the reader 5. Then, in a state where the columnar body 29 is fitted in the mounting groove 23a, the leader support shaft 27 is provided on the deck portion 23 so as to cross the mounting groove 23a in the width direction and penetrate the columnar body 29. , Whereby the reader 5 is mounted on the base 3
0, it is attached to the base machine 2 via the support plate 31 and the gate member 4.

At the front end of the support plate 31, a locking protrusion 33 (FIGS. 2 and 3) protruding upward and extending in the width direction is provided. A support member 34 made of H-shaped steel is fixed to the upper surface of the support plate 31 so as to extend in the front-rear direction.
The above-mentioned portal member 4 is supported by the above.

The portal member 4 is formed with a pair of column members 41 in the width direction formed by processing an H-shaped steel, and a top plate 42 bridged between the tops of the column members 41. The member 41 is supported and fixed by the pair of support members 34 and thus stands on the reader base 3. In addition, the reader 5 is fixed in a state of being erected on the top plate 42. Then, in a state where the gate-shaped member 4 is fixed on the support member 34, a drive means storage space 43 for storing the central rotation drive means 8 is formed between the pair of support members 41 and between the support members 34. I have.

In the present embodiment, the rotation driving means 8 comprises a pair of side driving means 8b in the width direction, and a central portion disposed between the side driving means 8b and disposed in the driving means storage space 43. Drive means 8a. These rotation driving means 8 include a driving motor 81, a reduction gear 82 for reducing the driving rotation of each driving motor 81, and a rotation transmitting member 84 for transmitting the reduced rotation driving by the reduction gear 82 to each of the stirring shafts 6. .

The speed reducer 82 has a casing formed in a rectangular parallelepiped shape when viewed from the outside, and a drive motor 81 is provided upright on one side thereof. And a speed reducer 8 for the side driving means 8b.
2 is supported by a box-shaped pedestal 83 attached to the front frame 32 and the locking ridge 33, while the speed reducer 82 for the central driving means 8 a
The drive motor 81 is supported by the support plate 31 of the reader base 3 in the inside 3, and the drive motor 81 is erected on the speed reducer 82 so as to be located in the drive means storage space 43 of the portal member 4.

Each of the pedestals 83 is externally fitted to the locking ridge 33 of the reader base 3 from above in a sliding state.
It has a U-shaped coupling piece 83a at the rear upper edge, and is fixed to the reader base 3 by fastening a bolt (not shown) in a state where the coupling piece 83a is fitted into the locking ridge 33. It has become. Therefore, it is possible to move the gantry 83 in the width direction by loosening the bolts.
The distance between the center axes of the stirring shaft 6 on the side b and the stirring shaft 6 on the side of the central driving means 8a can be adjusted.

Each of the drive motors 81 of the pair of side drive means 8b is provided on a respective one of the speed reducers 82 and is erected on a side remote from each other. Is provided on the side opposite to the side on which the drive motor 81 is provided. On the other hand, the central driving means 8
The speed reducer 82a is disposed with the side on which the rotation transmitting member 84 is provided fitted in the gap between the pair of side speed reducers 82 for the side driving means 8b. The front of the base 3 is aligned in a line in the width direction.

The rotation transmitting member 84 is provided with a bearing cylinder 8 projecting upward from the upper surface of the casing of the speed reducer 82.
5, a rotating disk 86 fitted in the bearing cylinder 85 in a sliding contact state and supported rotatably around its own axis, and a friction cutter 87 provided upright on the upper surface of the rotating disk 86. Have been.

The rotating disk 86 receives the rotation of the drive motor 81 via a speed reducer 82, thereby rotating the disk 86 in a predetermined direction around its own axis (in this embodiment, clockwise in plan view).
It is designed to rotate. Such a rotating disk 86
Has an insertion hole 86a extending in the up-down direction in the axial center portion, and the prismatic stirring shaft 6 is inserted into the insertion hole 86a. In the case of the central driving means 8a, the stirring shaft 6 penetrates the casing of the speed reducer 82, and in the case of the side driving means 8b, the stirring shaft 6 passes through the casing of the speed reducer 82 and the gantry 83 thereunder. Are protruding and hanging outward.

The friction cutter 87 has a pair of inverted trapezoidal support plates 87a erected on the rotating disk 86 so as to face each other, and protrudes outward from the respective support plates 87a. Each pair of brackets 87b and a pair of first rollers 87c that are rotatably supported around the axis so as to face each other at the upper portion between the shaft support plates 87a.
And a pair of second rollers 87d rotatably supported around the axis between the pair of brackets 87b.

A second roller 87 is attached to each shaft support plate 87a.
d is provided in the portion provided with d, and each second window 87e is opened.
The rollers 87d enter the inside of the shaft support plate 87a with their peripheral surfaces facing each other via these through windows 87e. The distance between the peripheral surfaces of the first roller 87c and the second roller 87d facing each other is
The size of the stirring shaft 6 is set to be equal to the length of one side in a plan view, whereby the pair of first rollers 87 is set.
In a portion surrounded by c and the pair of second rollers 87d, a square space is formed in a plan view into which the stirring shaft 6 can be inserted. The stirring shaft 6 is inserted into this space.

Accordingly, when the rotating disk 86 rotates around the axis, this rotation is transmitted to the stirring shaft 6 via the pair of first roller 87c and second roller 87d, and the stirring shaft 6 moves up and down. At this time, the rollers 87c and 87d that are in contact with the surface of the stirring shaft 6 rotate, so that the stirring shaft 6 can be moved up and down smoothly.

A cylindrical rotor shaft 64 is connected to a lower end of each of the stirring shafts 6 via a predetermined connection fitting. Each rotor shaft 64 is provided with a stirring blade 63 projecting radially in two stages in the upper and lower directions, and a disc-shaped excavating blade 65 is provided at the lower end of the rotor shaft 64. The soil is excavated by the roundness of the blade 65 around the rotor shaft 64, and the rotor shaft 6 of the stirring blade 63 thereon is excavated.
By the four rotations, the excavated soil and the ground improvement material separately loaded in the excavation hole are mixed and stirred.

A connecting member 66 for rotatably supporting and connecting three rotor shafts 64 is provided between the upper and lower stirring blades 63.
The connection by the connection member 66 prevents the distance between the three rotor shafts 64 from changing even if the three rotor shafts 64 enter the soil during excavation work. The connecting member 66 is mounted on the rotor shaft 64 by bolting, and can be easily replaced with another connecting member when the distance between the shafts is changed.

Each of the stirring shafts 6 is supported at its upper end by a thrust bearing structure 7.
It goes up and down by going up and down. FIG. 6 is a perspective view showing one embodiment of the thrust bearing structure 7. In FIG. 6, the XX direction is referred to as the width direction, the YY direction is referred to as the front-back direction, and in particular, the -X direction is referred to as left, the + X direction is referred to right, the -Y direction is referred to as front, and the + Y direction is referred to as rear. As shown in this figure, the thrust bearing structure 7 has a central support frame 71
A pair of widthwise side support frames 72 provided on both sides of the center support frame 71, and these support frames 71, 72;
And a cylindrical thrust bearing 73 supported on the base member.

The center support frame 71 is provided with a pair of side plates 71a in the width direction, a pair of upper and lower horizontal plates 71b bridged between the side plates 71a, and extends rearward from upper and lower edges of the side plates 71a. And a pair of upper and lower connection arms 74. The rear end side of each connection arm 74 is C
A gripping piece 74a having a U-shape is provided, and the gripping piece 74a grips a pair of widthwise guides 51 arranged in parallel with the reader 5 in a sliding contact state, thereby forming a thrust bearing structure. 7 can be moved up and down while being guided by the guide 51.

Each of the side supporting frames 72 is formed in a rectangular parallelepiped shape including a pair of side plates 72a in the width direction and a pair of horizontal plates 72b in the vertical direction bridged between the side plates 72a. Such a side support frame 72 includes a central support frame 71.
Is connected via a trapezoidal attachment 75 to the side plate 71a.

The thrust bearing 73 has a thrust shaft 73a vertically penetrating the cylindrical main body, and is restricted from moving in the axial direction.
The upper and lower horizontal plates 71b and 72b are rotatable around the axis.
Are attached to the support frame bodies 71 and 72 in a state where they pass through. Among the thrust shafts 73a, those extending downward are provided with a flange 73b at the lower end, and a flange 67 is also provided at the upper end of the stirring shaft 6, and these flanges 73b and 67 are bolted together. The stirring shaft 6 is connected to the thrust bearing 73 by being connected to each other by a stopper or the like.

FIG. 7 is a perspective explanatory view for explaining the mechanism for moving the stirring shaft 6 up and down, that is, the mechanism for moving the thrust bearing structure 7 up and down. Note that XX in FIG.
The direction is called the width direction, the YY direction is called the front-back direction,
In particular, the -X direction is referred to as left, the + X direction as right, the -Y direction as front, and the + Y direction as rear. Hereinafter, the lifting mechanism of the thrust bearing structure 7 will be described with reference to FIGS. 2 and 6 based on FIG. By the way, thrust bearing structure 7
The vertical movement involves many horizontal axes extending in the width direction and many sheaves rotatably supported around these horizontal axes. Therefore, the horizontal axis and sheave will be described first.

The column member 4 (FIG. 2) includes a column member 4
A pair of bearing plates 45 are provided in the width direction and project from the bridge plate 44 toward the front. 91 are provided. The first horizontal shaft 91 has a left first sheave 95a and a right first
Each sheave 95b is pivotally supported.

Each connecting arm 74 below the central support frame 71 (FIG. 6) is provided with a pair of second horizontal shafts 92 extending in the width direction.
The left second sheave 96a and the right second sheave 96b are rotatably supported around the shaft.

A pedestal 52 is provided at the top of the stirring shaft 6.
(FIG. 6), a pair of bearing members 53 in the width direction are provided on the upper surface of the pedestal 52, and a third horizontal shaft 93 extending in the width direction is supported on each of the pair of bearing members 53. I have. And the left third horizontal axis 93
The left third sheave 97a is rotatably supported about the third horizontal axis 93, and the right third sheave 97b is rotatable about the third horizontal axis 93 on the right third horizontal axis 93. It is pivoted on.

Further, a fourth horizontal shaft 94 extending in the width direction is bridged between the connection arms 74 on the upper part of the central support frame 71 (FIG. 6). The left fourth sheave 98a and the right fourth sheave 98b are rotatably supported about the axis.

In addition, a fifth extending in the front-rear direction between the bearing plates 45 is provided on the front surface of the bridge plate 44 (FIG. 2) of the portal member 4.
A horizontal axis 90a (FIG. 7) is provided.
A fifth sheave 99a is rotatably supported around a, and a sixth horizontal shaft 90b (FIG. 6) extending in the front-rear direction is provided below the pedestal 52.
A sixth sheave 99b is rotatably supported around 0b.

On the other hand, the descent drum 910 and the ascending wire 910 on which the descending wire rope 61 which is rotated by the driving of a driving means (not shown) are wound at appropriate places of the leader base 3, the gate member 4 and the leader 5, respectively. A lifting drum 920 around which the rope 62 is wound is provided. Then, the lowering wire rope 61 pulled out from the lowering drum 910 is, as shown in FIG. 7, a left first sheave 95a, a left second sheave 96a, a fifth sheave 99a, a right second sheave 96b, and a right The distal end portion is fixed to an appropriate position such as the reader base 3 while being sequentially wound around the first sheave 95b.

The ascending wire rope 62 pulled out from the ascending drum 920 is connected to the left third sheave 97a, the left fourth sheave 98a, the sixth sheave 99b, and the right fourth sheave 9
The distal end portion is fixed to a proper position of the reader 5 in a state where the distal end portion is wrapped around the second sheave 8b and the right third sheave 97b sequentially.

According to the above structure of the lifting mechanism, when the driving means of the lowering drum 910 is driven in a state where the driving means of the raising drum 920 is free, and the lowering wire rope 61 is wound up, the lowering mechanism becomes lower. The wire rope 61 pulls the second horizontal shaft 92 downward while rotating the left second sheave 96a and the right second sheave 96b around the second horizontal shaft 92, whereby the thrust bearing structure 7 descends. Conversely, when the driving means of the ascending drum 920 is driven while the driving means of the descending drum 910 is free, and the ascending wire rope 62 is wound, the ascending wire rope 62 is moved to the left fourth sheave 98a. In order to pull the fourth horizontal shaft 94 upward while rotating the right fourth sheave 98b around the fourth horizontal shaft 94, the thrust bearing structure 7 is raised.

According to the ground improvement apparatus 1 having the above structure, the rotation transmitting member 84 is rotated by the drive of the rotation drive means 8 while the stirring shaft 6 is lowered by the lowering of the thrust bearing structure 7 by the rotation of the lowering drum 910. Since the stirring shaft 6 descends while rotating about the axis, the soil at the excavation position is excavated by the rotation of the disc-shaped excavating blade 65 around the rotor shaft 64, and the excavated soil is excavated by the stirring blade 63 in the excavation hole. Stir. Therefore, by supplying a ground improvement material such as ready-mixed concrete from a ground improvement material supply means (not shown) to the excavation hole, the ground improvement material and the excavated soil are stirred and mixed by the stirring blade 63.

Then, in a state in which a drilling hole having a predetermined depth is formed, the rotation of the lowering drum 910 is made free and the raising drum 920 is rotated, so that the stirring blade 63 rotates the rotor shaft. While rotating around 64, the soil improvement material and the excavated soil rise while stirring, and when the disc-shaped excavation blade 65 is pulled up from the excavation hole, the excavation hole has a columnar shape composed of the soil improvement material and the excavated soil. The ground improvement body is formed.

In the present invention, the reader 5 is supported by the machine main body 21 via the gate-shaped member 4 and the drive motor 81 of the central driving means 8a is connected to the gate-shaped member 4
Since the leader 5 and the drive motor 81 are prevented from interfering with each other by being disposed in the drive means storage space 43, the stirring shaft 6 can be disposed closer to the reader 5 by that much. As a result, as shown in FIG. 8, the moment (F × L1) that the leader 5 receives from the stirring shaft 6 via the guide 51 during the excavation work is indicated by a two-dot chain line because the portal member 4 does not exist. It is necessary to make the portal type member 4 and the leader 5 structurally robust because the stirring shaft can be made smaller than the conventional moment (F × L2) in which the stirring shaft cannot be brought close to the leader 5. And the weight of the equipment can be reduced, which can contribute to reduction of the equipment cost.

Further, since the stirring shaft 6 can be brought closer to the cab of the base machine 2 as compared with the related art, the operation operation becomes easier accordingly.

Further, the distance between the three agitating shafts 6 can be changed by replacing the attachment member 75 provided on the side plate 71a of the central support frame 71 and the connecting member 66 bridged between the rotor shaft 64 and the side. The pair of pedestals 83 for the unit driving means 8b can be easily changed by moving in the width direction while being guided by the locking ridges 33 and fastened, so that the pitch of the excavation position by the three stirring shafts 6 can be changed. The degree of freedom in setting can be increased.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above-described embodiment, three stirring shafts 6 are employed. However, the present invention does not limit the number of stirring shafts 6 and less than three stirring shafts. Or four or more.

(2) In the above embodiment,
The central part of the three stirring shafts 6 is targeted, and only the drive motor 81 of the central part drive means 8a is accommodated in the drive means storage space 43 of the portal member 4. Instead, the drive motors 81 for any two adjacent stirring shafts 6 may be accommodated in the drive means housing space 43, or the drive motors 81 for all three stirring shafts 6 may be housed in the drive means housing space 43. You may put it.

(3) Further, when the number of the stirring shafts 6 becomes four or more, any one of the driving motors 81 is driven by the driving means housing space 4.
3 can be arbitrarily set as appropriate according to the facility condition of the ground improvement apparatus.

(4) In the above embodiment, the lower end of the reader 5 is located at the front end of the base machine 2 (deck 23).
It is fixed to the base machine 2 via the portal member 4 so as to be located at a higher position.
Is not limited to adopting
The character-shaped structure is fixed to the deck portion 23 of the base machine 2 to form an overhang portion projecting forward on the upper portion of the structure, and the leader 5 is erected on the upper surface of the overhang portion. Alternatively, a drive motor 81 for rotating the stirring shaft 6 may be provided below the overhang portion.

[0061]

According to the ground improvement apparatus of the first aspect of the present invention, a connecting member for supporting the leader is provided at the front end of the base machine, and the leader is provided upright on the connecting member. Since the storage space for accommodating the rotation driving means is provided, by mounting the rotation driving means in the storage space of the connecting member and mounting it below the reader, interference between the rotation driving means and the reader is avoided,
The stirring shaft provided at a position in front of the rotation driving means can be arranged at a position closer to the reader, whereby when the rotation driving means and the stirring shaft are sequentially arranged in front of the reader as in the conventional case, In comparison, the distance between the leader and the stirring shaft is shortened, and the effect of the moment is correspondingly reduced, thereby simplifying the support structure of the stirring shaft and contributing to a reduction in equipment cost. .

Further, since the distance between the leader and the stirring shaft is shortened, the operator operating the base machine can work closer to the work position than before, so that the work position can be reduced. Can be more reliably visually checked, and as a result, erroneous operation of the base machine can be reliably prevented, for example, excavation work at an incorrect construction position can be avoided.

According to the ground improvement apparatus of the second aspect of the present invention, the leader is supported on the base machine via the portal member having two columns, and the rotary driving means for the stirring shaft is portal-type. Because it was arranged between the pillars of the member,
Structurally superior strength due to the two columns, the reader can be reliably supported, and the rotation driving means is possible by arranging the rotation driving means between the two columns. It is possible to make the stirring machine as close as possible to the center of the base machine, so that the stirring shaft on the tip side can be easily brought closer to the reader.

According to the ground improvement device of the third aspect of the present invention, since the distance between the plurality of stirring shafts can be changed, the stirring shafts can be adjusted in accordance with a preset drilling hole excavation pitch. Can be changed, and the degree of freedom in setting the excavation pitch can be increased.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a ground improvement device according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a structure for arranging rotation driving means.

FIG. 3 is a cross-sectional view of a main part of the rotation drive unit arrangement structure of FIG. 2 when viewed from the side.

FIG. 4 is a front view of the rotation drive unit arrangement structure of FIG. 2;

FIG. 5 is a cross-sectional view of a main part of the structure of the rotation driving unit provided in FIG. 2 in plan view.

FIG. 6 is a perspective view showing one embodiment of a thrust bearing structure.

FIG. 7 is an explanatory perspective view for explaining a mechanism of elevating and lowering the thrust bearing structure.

FIG. 8 is an explanatory diagram for explaining the operation of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground improvement apparatus 2 Base machine 21 Machine main body 22 Crawler 23 Deck part 24 Deck arm 25 Fore leg 25a Fixed fore leg 25b Movable fore leg 26 Hind leg 26a Fixed hind leg 26b Movable hind leg 27 Leader support shaft 28 Multistage cylinder device 29 Columnar body 3 Leader base 30 Base part 31 Support plate 32 Front frame 33 Locking ridge 34 Support member 4 Portal member (connection member) 41 Support member 42 Top plate 43 Driving means storage space 44 Cross-link plate 45 Bearing plate 5 Leader 51 Guide 52 Pedestal 53 Bearing member 6 Stirrer shaft 61 Lowering wire rope 62 Ascending wire rope 63 Stirrer blade 64 Rotor shaft 65 Disc-shaped excavating blade 66 Connecting member 67 Flange 7 Thrust bearing structure 71 Central support frame 71a Side plate 71b Horizontal plate 72 Side Support frame 73 Thrust bearing 73a Last shaft 73b Flange 74 Connection arm 74a Grip piece 75 Attachment 8 Rotation drive means 8a Central drive means 8b Side drive means 81 Drive motor 82 Reduction gear 83 Mount 83a Coupling piece 84 Rotary transmission member 85 Bearing cylinder 86 Rotating disk 87 Friction Cutter 87a Shaft support plate 87b Bracket 87c First roller 87d Second roller 90a Fifth horizontal axis 90b Sixth horizontal axis 91 First horizontal axis 92 Second horizontal axis 93 Third horizontal axis 94 Fourth horizontal axis 95a Left first sheave 95b Right first sheave 96a Left second sheave 96b Right second sheave 97a Left third sheave 97b Right third sheave 98a Left fourth sheave 98b Right fourth sheave 99a Fifth sheave 99b Sixth sheave 910 Lowering drum 920 For raising drum

Claims (3)

[Claims] 1. A reader erected at a front end of a base machine and supported by the reader so as to rotate around an axis by driving a rotation driving unit and a lifting driving unit and to move up and down along the reader. One or more stirring shafts are formed, and the stirring shaft has a stirring blade at a lower end portion, and the stirring shaft is rotated by the rotation drive unit while being driven by the elevation drive unit. In the ground improvement apparatus configured to drill a drilling hole in the ground by lowering and to feed a ground improvement material to the drilling hole, a connecting member supporting the leader is provided at a front end of the base machine. The ground improvement device, wherein the leader is provided upright on the connecting member, and the connecting member has a storage space for storing the rotation driving means. 2. The ground improvement apparatus according to claim 1, wherein the connecting member is formed by a gate-shaped member having two columns, and the storage space is formed between the columns. 3. The ground improvement device according to claim 1, wherein the plurality of stirring shafts are configured such that the distance between the respective shafts can be changed.