JP3373815B2 - Ground improvement equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ground improvement, which is a type of civil engineering and construction work, by forcibly stirring and mixing an improving material such as lime and cement and soft soil of the foundation ground in the ground. The present invention relates to ground improvement for forming mixed treated soil in the form of solid columns, walls, blocks, and the like. More specifically, the present invention relates to a ground improvement device for performing ground improvement by mechanically stirring and mixing an improving material and soft soil with a mixer.

[0002]

2. Description of the Related Art Conventionally, as a ground improvement device of this type, for example, one document (“Ground Improvement Manual by Cement-based Solidifying Material [Second Edition]”, page 84, FIG. 3.26, Japan Cement Association, There is a self-propelled backhoe type device disclosed by August 30, 1996).

As shown in FIGS. 34 and 35, this type of apparatus includes a backhoe 62, which is a construction work machine including a working arm 61, and a mixer 6 attached to the arm 61.
3, 64. Alternatively, some mixers may further include a hose (not shown) for supplying the improving material and the like near the mixers 63 and 64. In the apparatus provided with the hose and the like, the mixers 63 and 64 are driven, and at the same time, the improving material is supplied to stir and mix the soft soil and the improving material. In a device not provided with a hose or the like, the improving material is sprayed on the target ground in advance, and then the mixers 63 and 64 are driven to stir and mix the soft soil and the improving material.

The first mixer 63 shown in FIG. 34 is provided with a rotary shaft 65 that is erected vertically to the ground and a plurality of stirring blades 66 that rotate horizontally at the lower end of the shaft 65. In the mixer 63, the shape of the improved body formed by the stirring blade 66 once is a circular column shape, and the improved bodies are arranged in the required number in an orderly manner on the target ground.

A second mixer 64 shown in FIG. 35 includes a support frame 67 that is vertically erected on the ground and a plurality of stirring blades 68 that are coaxially rotated vertically at the tip of the frame 67.
With. In this mixer 64, 1
The shape of the improved body is a square quadrangular column.

[0006]

However, in the former device including the first mixer 63, the columnar improvement body is theoretically applied vertically to the ground, but the backhoe 62 is used. The vertical construction by operating the arm 61 requires a high degree of skill in operating the arm 61. Therefore, it was not easy to perform the vertical construction of the improved body. In the former device, when the backhoe 62 is stopped at a fixed position, the movement of the mixer 63 is restricted by the turning and vertical movement of the arm 61. Therefore, movements other than turning and vertical movement cannot be added to the movement of the mixer 6, and the degree of freedom of movement cannot be increased. For this reason as well, it can be said that the former device is unsuitable for the polygonal improvement method and unsuitable for ground improvement in a narrow place. For this reason, in order to compensate for the movement of the mixer 63, the backhoe 61 has to be frequently moved back and forth and left and right, which causes a construction loss.

Even in the latter device having the second mixer 64, a high degree of skill is required to operate the arm 61 for vertical installation by operating the arm 61 of the backhoe 62. Therefore, it is not easy to carry out vertical construction of the improved bodies, and when the vertical construction is insufficient, some of the adjacent improved bodies overlap each other, which causes construction loss. Further, even in the latter device, when the backhoe 62 is stopped at a fixed position, the mixer 6 is operated for the same reason as in the former device.
4 is restricted, and the degree of freedom of movement of the mixer 64 cannot be increased outside the restricted movement range. Therefore,
When the latter device is used for the polygonal modification method, the mixer 6
In order to supplement the movement of 4, the backhoe 62 also has to be frequently moved back and forth and left and right.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a ground improvement device which enables easy and smooth vertical construction of an improved body. . A second object of the present invention is to provide, in addition to the first object, a ground improvement device capable of reducing construction loss during ground improvement and facilitating ground improvement in a narrow place. It is in. A third object of the present invention is, in addition to the second object, is to provide a ground improvement apparatus capable of increasing the degree of freedom of movement of the mixer.

[0009]

In order to achieve the above first to third objects, the ground improvement device of the invention according to claim 1 is provided with a mixer including a stirring section which is driven to rotate, By pushing the machine against the ground and driving the stirring unit,
In the ground improvement device, which agitates the ground and agitates and mixes the improving material and the soft soil given to the ground, an elevator for vertically moving the mixer vertically with respect to the ground, and an elevator , a support frame, It is supported so that it can move up and down with respect to its support frame
And include a lifting pillar mixer is attached to the lower end, an elevating drive mechanism for the lifting column lifting drive is Te, the lifting
The drive mechanism is provided on the support frame so that the lifting column can be raised and lowered.
Along the longitudinal direction of the lifting column and the guide roller for entering
Between the stretched driven chain and the lifting column and the driven chain
And a drive sprocket connected to the driven chain,
The drive sprocket is located above and below the drive sprocket.
A pair of pressers that press the driven chain between
And a motor for rotating the drive sprocket.
Including and mixing machine horizontally around the axis of the lifting column
And a horizontal rotating means for rotating the elevator to
Attached to the construction work machine, the construction work machine swings and
It is a backhoe including an arm that can move downward
Place the machine near the tip of the arm and to the side of the arm.
The purpose is to attach it to the arm .

[0010] According to the above soil modifying apparatus, the apparatus, by operating the elevator is stopped at a predetermined position of the current field, the mixer is raised and lowered perpendicular to the ground. In other words, elevator is attached to the arm provided in the construction設作industry machines. Then, by stopping the construction work machine at a predetermined position on the site and operating the lifting drive mechanism, the lifting pillar is lifted and the mixer at the lower end of the lifting pillar is lifted vertically to the ground. Therefore, the ground is agitated with the descending of the elevating column, and the improving material and the soft soil given to the ground are agitated and mixed only by operating the elevating drive mechanism while pushing the mixer against the ground and driving the agitation unit. vertical construction of one of the improved body Ru is carried out. In addition, the elevator drives the motor.
Drive actuates the drive sprocket,
Driven chain operates between the press and each press roller,
Along with this, the elevating column is guided by the guide rollers and the supporting frame
It is moved up and down with respect to the ground
Lifted vertically. In this device, the driven chain is pushed
Since it is pressed by the roller, the driven chain
It is difficult to fall off the drive sprocket. In addition,
Drive sprocket and driven chain with driven chain
Because it is connected to the drive sprocket and the driven Ji
The connecting part with the vane is not directly exposed to the earth and sand,
Sediment becomes difficult to bite. In addition, activate the horizontal rotation means.
This allows the mixer to move horizontally around the axis of the lifting column.
The mixer can be rotated in any direction to freely set the horizontal orientation of the mixer.
be changed. In addition, the lift is at the end of the backhoe arm.
It is placed near the edge and on the side of the arm and
Since it can be attached, the backhoe is stopped at a predetermined position on the site.
With it stopped, rotate the arm or move the arm up and down.
By moving it so that it stays within the range of movement of the arm.
The elevator and mixer are moved by the
Can be changed easily. Furthermore, how the arm is moved
The elevator and mixer and the arm may interfere with each other.
The movement of the arm is limited by the elevator and mixer.
Never receive.

In order to achieve the above first to third objects, the ground improvement apparatus of the invention according to claim 2 is provided with a mixer including a rotationally driven stirring section, and the mixer is pushed against the ground. By driving the above part by stirring, the ground is stirred,
In the ground improvement device for stirring and mixing the improving material and the soft soil given to the ground, an elevator for vertically moving the mixer vertically with respect to the ground, an elevator, a support frame,
An elevating column that is supported so as to be able to elevate and lower with respect to the support frame and has a lower end to which the mixer is attached; and an elevating drive mechanism for vertically moving the elevating column, and the elevating drive mechanism is provided on the support frame. The upper hydraulic cylinder and the lower hydraulic cylinder that include a telescopic rod that expands and contracts in the direction of raising and lowering the elevating column, the upper chuck and the lower chuck that are provided to clamp the elevating column between the upper and lower positions, and the upper chuck is the upper part. It is provided on the telescopic rod of the hydraulic cylinder, and the lower chuck is provided on the telescopic rod of the lower hydraulic cylinder, and the upper chuck and the lower chuck are alternately closed to sandwich the lifting column, and at least one of the chucks is held. By vertically moving by expanding and contracting the telescopic rod of the corresponding hydraulic cylinder, it is possible to raise and lower the elevating column continuously with the mixer. And a horizontal rotating means for rotating the mixer in a horizontal direction around the axis of the elevating column, the elevating machine is attached to the construction work machine, and the construction work machine is capable of turning and vertical movement. It is a backhoe including the above-mentioned arm, and it is intended that the elevator is attached to the arm by being arranged near the tip of the arm and on the side of the arm.

According to the above soil modifying apparatus, the temperature descending machine,
In a state where the lifting pillar is held by one of the upper chuck and lower chuck were supported lifting column vertically, the upper hydraulic cylinder
By vertically expanding and contracting the telescopic rods of the da and lower hydraulic cylinders to move up and down, the elevating column is moved up and down vertically with the mixer with respect to the ground. After that, both chucks
Sandwiching the more lifting columns towards, while releasing the holding by the hand of the chucks, by raising and lowering the respective hydraulic cylinders each chuck by stretching the extensible rod of writing, the position of said one chuck source Return to. At the same time, by vertically expanding and contracting the telescopic rod of the other hydraulic cylinder to raise and lower, the elevating column is moved up and down together with the mixer with respect to the ground. After that, again, the clamping of the lifting column by the other chuck is released, the lifting column is clamped by one chuck and returned to the original position, and the telescopic rod is vertically supported with the lifting column supported vertically. By expanding and contracting, the elevating column is further moved up and down together with the mixer. Thus, the upper and lower chucks are alternately closed to sandwich the lifting column, and at least one of the chucks is moved up and down by the expansion and contraction of the telescopic rod of the corresponding hydraulic cylinder , so that the mixer can be operated together with the lifting column. Raise and lower. Furthermore,
By operating the horizontal rotation means, the mixer will move up and down.
Is rotated horizontally about the axis of
The orientation in can be changed freely. In addition, the elevator
Place it on the side of the arm near the tip of the arm.
Since it is placed and attached to the arm,
With the arm stopped at a predetermined position on the site, turn the arm.
By moving it or moving the arm up and down.
The elevator and mixer are moved within the movement range of the
The construction position by the mixer can be easily changed. In addition,
No matter how the system is moved,
Do not interfere with each other and the movement of the arm
And it is not limited by the mixer.

In order to achieve the first to third objects, the ground improvement device of the invention according to claim 3 is a rotary drive.
Equipped with a mixer that includes
Stir the ground by standing and driving the stirring unit,
Stir and mix the improvement material given to the ground and soft soil
In the improved soil improvement device, the mixer is suspended against the soil.
The elevator for direct elevation and the elevator are mixed at the lower end.
The lifting column to which the machine is attached and the lifting column
And it includes an elevating drive mechanism for elevating driving mechanism,
And it includes a support frame for vertically movably supporting the lifting column, and a screw jack provided between the lift columns and the supporting frame in order to a lifting column vertically driving the screw Ja
The stick is fixed to the support frame and the hydraulic motor fixed to the support frame.
The drive shaft connected to the output shaft of the hydraulic motor.
When placed along the central axis of the abox and support frame
Both ends are screw-coupled to the gearbox.
And the screw rod that is fixed to the lifting column
Including a screw bearing fitted on top of
Rotate the copier horizontally around the axis of the lifting column.
And a horizontal rotation means for turning the elevator into a construction work machine.
Mounting and construction work machines allow swivel and vertical movement
It is a backhoe that includes
Place on the side of the arm near the tip and attach it to the arm.
The purpose is to attach it.

According to the above soil modifying apparatus, the temperature descending machine,
By operating the screw jack, the elevating column is moved up and down while being supported by the support frame, and accordingly, the mixer is vertically moved with respect to the ground. That is, the hydraulic motor
By moving the screw through the gearbox
The rod rotates and the screw bearing moves on the rod.
It Along with the movement of this screw bearing, the lifting column
Driven up and down along. In addition, activate the horizontal rotation means.
This allows the mixer to move horizontally around the axis of the lifting column.
The mixer can be rotated in any direction to freely set the horizontal orientation of the mixer.
be changed. In addition, the lift is at the end of the backhoe arm.
It is placed near the edge and on the side of the arm and
Since it can be attached, the backhoe is stopped at a predetermined position on the site.
With it stopped, rotate the arm or move the arm up and down.
By moving it so that it stays within the range of movement of the arm.
The elevator and mixer are moved by the
Can be changed easily. Furthermore, how the arm is moved
The elevator and mixer and the arm may interfere with each other.
The movement of the arm is limited by the elevator and mixer.
Never receive.

In order to achieve the above first to third objects, the ground improvement device of the invention according to a fourth aspect is the ground improvement device according to the third aspect.
The ground improvement apparatus according to claim 1, further comprising: an outer frame attached to a predetermined mounting body, and an inner frame that is rotatably assembled to the outer frame so as to be rotatable in a horizontal direction and supports the elevating column. Includes a driven portion provided on the outer periphery of the inner frame, a drive portion provided on the outer frame and connected to the driven portion, and a motor provided on the outer frame for rotating the drive portion. The purpose is.

According to the ground improvement device described above, in addition to the operation of the ground improvement device according to the third aspect , the operation of the horizontal rotating means is embodied. That is, when the drive unit is operated by the motor and the driven unit is operated, the inner frame is rotated with respect to the outer frame, and the elevating column is rotated together with the inner frame.

[0017] To achieve the above first to third objects, the soil improvement apparatus of the invention described in claim 5, claim 1
In the ground improvement device of the invention described in (1), an outer frame attached to a predetermined mounting body and an inner frame that is rotatably assembled to the outer frame in a horizontal direction and supports the elevating column and the horizontal rotation means. The horizontal rotation means includes a driven portion provided on the outer periphery of the inner frame, a drive portion provided on the outer frame, a motor provided on the outer frame for rotating the drive portion, and a driven portion. The purpose is to provide a connecting means for connecting to the section.

According to the above ground improvement apparatus, the operation of the horizontal rotation means is embodied in addition to the operation of the ground improvement apparatus according to the first aspect . That is, the drive unit is activated by the motor,
When the driven portion operates via the connecting means, the inner frame is rotated with respect to the outer frame, and the elevating column and the horizontal rotating means are rotated together with the inner frame.

In order to achieve the above first to third objects, the ground improvement device of the invention described in claim 6 is the ground modification device according to claim 2
In the ground improvement device of the invention described in (1), a support frame mounted to a predetermined mounting body is provided, and the horizontal rotating means is provided so as to be rotatable in the horizontal direction with respect to the support frame, and holds the elevating column. It is intended to include a sandwiching portion and a horizontally rotating telescopic portion that is provided on the support frame and that includes a telescopic rod that is telescopically extended to rotate the sandwiching portion in the horizontal direction.

According to the above ground improvement apparatus, the operation of the horizontal rotation means is embodied in addition to the operation of the ground improvement apparatus according to the second aspect. That is, when the elevating column is sandwiched by the sandwiching unit, the telescopic rod of the horizontally rotating telescopic unit is expanded and contracted, so that the elevating column is horizontally rotated together with the sandwiching unit with respect to the support frame. The machine is rotated horizontally.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A first embodiment embodying a ground improvement apparatus and a ground improvement method according to the present invention will be described below in detail with reference to the drawings.

1 and 2 show a schematic structure of the ground improvement device of the present embodiment. This ground improvement device includes a backhoe 1 as a construction work machine, an elevator 3 provided at the tip of an arm 2 thereof, and a mixer 4 provided in the elevator 3.

As is well known, the backhoe 1 includes a turning frame 5 provided so as to be turnable, and a boom 6 provided on the turning frame 5. The arm 2 is connected to the boom 6 and is connected to an arm cylinder 7 provided on the boom 6. The boom 6 is moved up and down by a boom cylinder 8 provided on the swing frame 5. By driving the arm cylinder 7, the inclination of the arm 2 with respect to the boom 6 can be changed. The bucket cylinder 9 provided on the arm 2 is connected to the elevator 3 via a link mechanism 10.
Then, by driving the bucket cylinder 9,
The inclination of the elevator 3 with respect to the arm 2 can be changed. Here, by appropriately driving the cylinders 7 to 9,
The boom 6, the arm 2 and the elevator 3 are moved,
The mixer 4 is moved up and down together with the elevator 3, and the inclinations of the elevator 3 and the mixer 4 are changed.

The mixer 4 includes drive wheels 12, guide wheels 13 and 14 and auxiliary wheels 15 and 16 provided on the support frame 11. A pair of drive wheels 12 are provided in parallel on the same drive shaft 17. Each guide wheel 13, 14 and each auxiliary wheel 15, 16
Also, a pair is provided in parallel on the same axis. Drive wheels 12, guide wheels 13, 14 and auxiliary wheels 15, 16 in each row
An agitation chain 18 is hung on each. A plurality of stirring blades 19 are attached to the outer circumference of each chain 18 at predetermined intervals. In this embodiment, the stirring chain 18 including each stirring blade 19 constitutes the stirring section of the present invention. A hydraulic motor 20 is provided on the support frame 11. Hydraulic oil is supplied to the hydraulic motor 20 through a supply pipe (described later). A sprocket 21 fixed on the output shaft of the hydraulic motor 20 is connected to a sprocket 22 fixed on the drive shaft 17 via a drive chain 23. A discharge nozzle 24 for discharging a cement-based improvement material for ground improvement, water and air is provided in the vicinity of both guide wheels 13, 14. The improver, water, and air are supplied to the discharge nozzle 24 through a supply pipe (described later).

By driving the hydraulic motor 20,
The sprocket 21 on the output shaft is rotationally driven, and the drive wheel 12 is rotationally driven via the drive chain 23, the sprocket 22 and the drive shaft 17. As a result, the stirring chain 18 is rotationally driven in the vertical direction, and each stirring blade 19 is orbitally driven along the rotation locus of the stirring chain 18.

Therefore, in order to improve the ground by using the mixer 4, as shown in FIG. 1, the mixer 4 is pushed against the ground, the stirring chain 18 is driven, and the improvement material is discharged from the discharge nozzle 24. Etc. are discharged. As a result, as shown in FIG. 2, the ground is agitated vertically and in a planar quadrangular shape, and the improving material and the like applied to the ground and the soft ground are agitated and mixed to form a columnar improved body. Ground improvement is performed by constructing a plurality of the improved bodies on the target ground.

The elevator 3 is for raising and lowering the mixer 4 vertically with respect to the ground. FIG. 3 is a plan view (partially broken) showing a state in which the elevator 3 is attached to the arm 2 and the like. FIG. 4 shows a side view of the elevator 3 of FIG. 3 viewed from the D direction. FIG. 5 shows a vertical sectional view of the elevator 3. FIG. 6 shows a cross-sectional view taken along the line EE of FIG. FIG. 7 shows an enlarged view of a portion surrounded by a circle in FIG. 8 is a sectional view taken along line AA of FIG. 6, FIG. 9 is a sectional view taken along line BB of FIG. 6, and FIG. 10 is a bottom view taken along line CC of FIG. Shown respectively.

As shown in FIG. 3, the elevator 3 includes an arm 2
Is arranged near the tip of the arm 2 and laterally of the arm 2 and attached to the arm 2 and the link mechanism 10. Figure 4,
As shown in FIG. 5, the elevator 3 includes a support frame 31 and a lifting column 32.
And a lifting drive mechanism 33. The support frame 31 is attached to the arm 2 and the link mechanism 10. Lifting column 32
Is supported so that it can move up and down with respect to the support frame 31, and the mixer 4 is attached to the lower end thereof. In this embodiment, the mixer 4 is detachably attached to the lower end of the lifting column 32 via bolts and nuts. The elevating drive mechanism 33 is for elevating the elevating column 32 with respect to the support frame 31. The support frame 31 includes an outer frame 34 and an inner frame 3.
Including 5. The outer frame 34 is attached to the arm 2 or the like.
The inner frame 35 is rotatably assembled to the outer frame 34, and supports the elevating column 32 and the elevating drive mechanism 33. The support frame (outer frame 34) 31 is provided with a horizontal rotation drive mechanism 36 for rotating the inner frame 35.

As shown in FIGS. 3, 5 and 9, the support frame 31
Includes a plurality of guide rollers 37 arranged above and below as guide portions. These guide rollers 37 are used for raising and lowering columns 32.
For guiding up and down (the illustration of the guide roller 37 is omitted in FIGS. 6 and 7). The lift drive mechanism 33 includes a driven chain 38 as a connecting means stretched along the longitudinal direction of the lift column 32, a drive sprocket 39 as a drive unit provided in the support frame (inner frame 35) 31, and a pressing unit. The pair of pressing rollers 40 and the motor 41 are provided. Both ends of the driven chain 38 are connected to brackets 32b provided at the upper and lower ends of the lifting column 32, respectively. The drive sprocket 39 is mounted on the lifting column 32.
And the driven chain 38 are connected to the same chain 38. The pair of pressing rollers 40 includes a support frame (inner frame 35) 3
The drive chain 38 is provided above and below the drive sprocket 39 and holds the driven chain 38 between itself and the drive sprocket 39. The motor 41 drives the drive sprocket 39.
To drive the rotation.

When the motor 41 is driven, the drive sprocket 39 is rotated, and the driven chain 38 runs between the sprocket 39 and each pressing roller 40. Along with this, the elevating column 32 moves the guide rollers 37
While being guided to, it is moved up and down with respect to the support frame 31. As a result, the mixer 4 attached to the lower end of the lifting column 32
Is lifted vertically to the ground.

As shown in FIGS. 5, 7, and 9, the horizontal rotation drive mechanism 36 includes a driven sprocket 42 as a driven portion of the present invention, a drive sprocket 43 as a driving portion of the present invention, and
A motor 44 and a drive chain 45 as a connecting means of the present invention are provided. The driven sprocket 42 is integrally provided on the outer periphery of the inner frame 35. The drive sprocket 43 is provided on the outer frame 34. The motor 44 is provided on the outer frame 34 and rotates the drive sprocket 43. The drive chain 45 is for connecting the driven sprocket 42 to the drive sprocket 43.

When the motor 44 is driven, the drive sprocket 43 rotates and the drive chain 45
The driven sprocket 42 is rotated via the. As a result, the inner frame 35 is rotated in the horizontal direction with respect to the outer frame 34,
The elevating column 32 and the elevating drive mechanism 33 are horizontally rotated together with the inner frame 35. As described above, in order to change the direction of the mixer 4 in the horizontal direction, the horizontal rotating means for rotating the elevating column 32 in the horizontal direction about its axis is configured.

FIG. 11 is a sectional view of the lifting column 32. The elevating column 32 has a rectangular cross section and a hollow shape. Lifting pillar 3
The plurality of supply pipes 46, 47, 4 are provided in the second hollow portion 32a.
8, 49 are accommodated and arranged along the longitudinal direction. The first supply pipe 46 is for supplying the discharge nozzle 24 of the mixer 4 with the cement-based improving material C as a material necessary for ground improvement. The second supply pipe 47 is also for supplying the discharge nozzle 24 with water W as a material necessary for ground improvement. The third supply pipe 48 is also for supplying the discharge nozzle 24 with air A as a material necessary for ground improvement. Fourth supply pipe 49
Is for supplying the hydraulic motor 20 of the mixer 4 with hydraulic pressure (working oil) required for ground improvement.

FIG. 12 shows a schematic structure in which the elevating column 32 and the driven chain 38 provided in the elevator 3 are the elevating column 32A and the driven chain 38A longer than those shown in FIGS. That is, in this embodiment, the driven chain 38 and the lifting column 32, which are a part of the lifting drive mechanism 33, are shortened by cutting off some of them or extended by adding another part to the ground. The length is set according to different required improvement depths for improvement. Here, FIG. 12 shows a state in which the elevating column 32A and the driven chain 38A that have been extended and lengthened by replenishment are attached to the support frame 31.

As described above, in this embodiment, the driving force required for mixing and stirring by the mixer 4 is not transmitted to the elevating column 32. That is, the drive sources of the mixer 4 and the elevator 3 are configured as separate entities. Accordingly, it is not necessary to drive the elevator 3 to drive the mixer 4 to raise and lower the elevating column 32, and the driving force when elevating the elevating column 32 does not act on the drive of the mixer 4. . Therefore, the movements of the elevating column 32 and the mixer 4 can be independent of each other. As a result, the elevator 3 can have a relatively simple structure.

Next, the operation of the ground improvement device configured as described above will be described. To improve the target ground using this ground improvement device, backhoe 1
Is sequentially moved to a required place to drive the elevator 3 and the mixer 4. For example, in order to perform one construction work at a certain place, as shown in FIG. 1, the backhoe 1 is stopped at that position, and the revolving frame 5, the boom 6 and the arm 2 are moved, so that the mixer 4 and Push the elevator 3 vertically to the ground. Then, by driving the stirring chain 18 and discharging the improving material or the like from the discharge nozzle 24, as shown in FIG. 2, the ground is stirred, and the improving material or the like given to the ground and the soft ground are mixed by stirring. A columnar improvement is formed. Ground improvement is performed by continuously constructing a plurality of the improved bodies on the target ground.

Here, in order to perform the ground improvement uniformly on the target ground in a predetermined range, it is necessary to construct each improved body vertically to the ground. According to this ground improvement device, by operating the elevator 3, the mixer 4 is lifted and lowered so as to be accurately perpendicular to the ground. That is, when the elevating drive mechanism 33 is operated, the elevating column 32 is elevated with respect to the support frame 31, and the mixer 4 at the lower end of the elevating column 32 is vertically elevated with respect to the ground. Therefore, the ground is agitated by only pushing the mixer 4 against the ground and driving the agitation chain 18 and the agitation blade 19, and the ground is agitated, and the improving material and the soft soil applied to the ground are agitated and mixed, Vertical construction of one improved body is performed. Therefore, the vertical construction of one improved body can be easily and smoothly performed. That is, in the conventional ground improvement device, the vertical construction of the improved body by operating the arm 61 of the backhoe 62 requires a high degree of skill to operate the arm 61, and the work is not easy. On the contrary,
According to the ground improvement device of the present embodiment, it is possible to easily and smoothly perform the vertical construction of one improved body simply by operating the elevator 3 together with the mixer 4. Therefore, even when a plurality of improvement bodies are continuously vertically constructed on the target ground, adjacent improvement bodies do not accidentally lap each other. In that sense, the ground can be improved uniformly within a predetermined range, and the construction loss can be reduced.

In the elevator drive mechanism 33 of the elevator 3 of this embodiment, the driven chain 38 is pressed by the pressing roller 40, so that the driven chain 38 does not easily fall off the drive sprocket 39. Further, since the drive sprocket 39 is connected to the driven chain 38 between the elevating column 32 and the driven chain 38, the connecting portion of both 39 and 38 is not directly exposed to the earth and sand, and the earth and sand are caught in the portion. It becomes difficult to be crowded. Therefore, it is possible to reduce the burden of maintenance of the elevating drive mechanism 33 due to biting of sand or the like, and it is possible to improve the durability of the elevating machine 3.

According to this ground improvement device, as shown in FIG. 11, in the elevator 3, the improvement material necessary for the ground improvement,
The supply pipes 46 to 49 for supplying materials such as water and air, or hydraulic oil (hydraulic pressure) are respectively provided in the lifting column 32.
It is housed in and protected by the hollow portion 32a. From this, even when the sand and the like are stirred and mixed by the mixer 4, the supply pipes 46 to 49 are less likely to be worn by the sand and the like. Further, when the plurality of supply pipes 46 to 49 are provided as described above, the plurality of supply pipes 46 to 49 are bundled by the elevating column 32, so that the plurality of supply pipes 46 to 49 are easily handled. Therefore, the supply pipes 46 to 49 can be prevented from being damaged, durability can be improved, and construction work for ground improvement can be smoothly performed.

Here, the depth required for vertical construction differs depending on the purpose of ground improvement, and it is desirable that this ground improvement device can also be adapted to construction depending on the difference in required improvement depth. In this ground improvement device, in the elevator 3, the existing elevator columns 32 and the driven chains 38 provided on the support frame 31 are partially cut off as necessary to reduce the overall length, or another one. The parts are replenished to extend the entire length. Then, as shown in FIG. 12, the elevating column 32A and the driven chain 38A, which are extendedly set to have lengths corresponding to different required improvement depths for ground improvement, are used. Therefore, it is possible to commonly use one support frame 31 to perform ground improvement according to different required improvement depths. As a result, the use range of the ground improvement device can be expanded with a small equipment cost. In addition, by using the elevating column 32 having a length corresponding to the required improvement depth, the own weight of the elevating machine 3 can be minimized. Therefore, the weight of the entire ground improvement device including the backhoe 1 can be reduced, the sinking of the backhoe 1 at the time of construction can be minimized, and the durability of the elevator 3 can be improved. Like

In this ground improvement apparatus, the mixer 4 is removably attached to the lower end of the elevating column 32 by means of bolts and nuts. From this, it becomes possible to selectively use a mixer having a structure suitable for various soil types, for example, various mixers such as a trencher type, a tine type, and a horizontal stirring type, which are selectively attached to the elevating column 32. Therefore, the optimum mixer can be selectively used for various soil types, and the application range of the ground improvement apparatus can be expanded.

According to this ground improvement device, the support frame 31
Includes an outer frame 34 attached to the arm 2 and the like, and an inner frame 35 assembled to the outer frame 34 so as to be rotatable in the horizontal direction. The lifting column 32 and the lifting drive mechanism 33 are supported by the inner frame 35. Then, the inner frame 35 is horizontally rotated by a horizontal rotation drive mechanism 36 including a driven sprocket 42, a drive sprocket 43, a motor 44, and a drive chain 45. Therefore, by operating the horizontal rotation drive mechanism 36, that is, by rotating the drive sprocket 43 by the motor 44 and rotating the driven sprocket 42 via the drive chain 45, the inner frame 35 is moved with respect to the outer frame 34. 3 and is rotated, as shown by the arrow in FIG.
3 is rotated together with the inner frame 35. As a result, the lifting column 3
The orientation in the horizontal direction of the mixer 4 attached to the 2 can be freely changed. As a result, for example, as shown in FIG.
As shown in (b), it is effective when constructing an improved area surrounded by obstacles such as structures. That is, in the case of improving the range of a narrow place where the construction work machine (backhoe 1) cannot be freely moved because it is surrounded by obstacles, etc., as shown in FIG. In the improved device, a gap is created between an obstacle such as a structure and the mixer 64, and untreated soil remains. On the other hand, according to the ground improvement device of the present embodiment, unlike the conventional case, as shown in FIG. 13A, the elevating column 32 is rotated horizontally to change the direction of the mixer 4. As a result, the mixer 4 can be arranged parallel to each side of the improvement range. As a result, even if the ground is improved in a narrow place, the mixer 4 becomes parallel to each side of the improvement range, so that an unimproved part remains or another improvement in which a part of the improved body is adjacent. I do not wrap it on my body. Therefore, it becomes possible to improve work efficiency in a narrow place. In other words, in the latter ground improvement device of the related art, the backhoe 62 itself had to be moved in order to change the direction of the stirring blade 68 at a specific construction point, but in the ground improvement device of the present embodiment, According to this, the stirring blade 19 without moving the backhoe 1
The direction can be changed, and in that sense, construction loss can be reduced, and ground improvement in a narrow place can be facilitated.

In addition, according to this ground improvement device, as shown in FIG.
As shown in FIG. 4, it is also effective when implementing the polygonal modification method.

Here, as described above, by rotating the elevating column 32 in the horizontal direction to change the direction of the mixer 4, the direction of the planar quadrangular improved body DP formed by the mixer 4 is changed to the wall. It can be easily adjusted to the construction direction of the improved body DW. Moreover, in this ground improvement device, the elevator 3
The mixer 4 is provided at the tip of the arm 2 of the backhoe 1. Therefore, the positions of the elevator 3 and the mixer 4 together with the backhoe 1 can be easily changed. Backhoe 1
By rotating the arm 2 or moving the arm 2 up and down in a state in which the arm 2 is stopped at a fixed position, the elevator 3 and the mixer 4 are moved within the movement range of the arm 2 by the mixer 4. The construction position can be easily changed. Therefore, the construction work of one improved body group DM shown in FIG. 14 is performed with the arm 2 while the backhoe 1 is stopped at a fixed position.
It can be done easily just by moving the etc. In this sense, it becomes possible to efficiently carry out ground improvement in a predetermined range centered on the backhoe 1.

That is, in the conventional ground improvement device, it is impossible to perform the ground improvement by the polygon improvement method as described above unless the backhoe 62 is frequently moved vertically and horizontally.
Work efficiency was poor. On the other hand, in the present embodiment, the above-mentioned ground improvement device is used to carry out the polygon improvement method, so that the backhoe 1 is not frequently moved vertically and horizontally, and a plurality of columnar improvement bodies are used. It is possible to perform continuous construction of DP, continuous construction of a plurality of wall-like improved bodies DW, and construction of one improved body group DM. In this sense, it is possible to reduce the construction loss and efficiently carry out the polygonal modification method.

In this ground improvement apparatus, the elevator 3 is arranged near the tip of the arm 2 and on the side of the arm 2 and attached to the arm 2 and the link mechanism 10. Therefore, no matter how the arm 2 is moved, the elevator 3 and the mixer 4 do not interfere with the arm 2 and the movement of the arm 2 is not restricted by the elevator 3 and the mixer 4. . Therefore, even when the ground improvement is performed by the polygonal improvement method having a complicated shape as described above, the degree of freedom of movement of the elevator 3 and the mixer 4 can be increased. In this sense as well, it is possible to reduce construction loss for ground improvement.

[Second Embodiment] Next, a second embodiment of the ground improvement device of the present invention will be described with reference to the drawings.

15 and 16 show a schematic structure of the ground improvement device of the present embodiment. This ground improvement device differs from the ground improvement device of the first embodiment in that the mixer 4 is attached to the tip of the arm 2 via another elevator 90 different from the elevator 3 described above.

The elevator 90 is for raising and lowering the mixer 4 with respect to the ground. The elevator 90 is shown in FIGS.
Shows the configuration of. The elevator 90 includes a support frame 92, an upper hydraulic cylinder 93 as a set of four elevating telescopic parts,
Lower hydraulic cylinder 94 as a set of four telescopic parts for lifting
An upper chuck 95 as an upper sandwiching portion, a lower chuck 96 as a lower sandwiching portion, a turning chuck 97 as a sandwiching portion, and an elevating column 98 vertically supported with respect to each of the chucks 95 to 97. Prepare In this embodiment, the four upper hydraulic cylinders 93, the four lower hydraulic cylinders 94, the upper chuck 95, and the lower chuck 96 constitute a lifting drive mechanism.

As shown in FIGS. 15 and 16, the support frame 92
Is arranged near the tip of the arm 2 and on the side of the arm 2 and is attached to the arm 2. Each upper hydraulic cylinder 9
The base end of 3 is fixed to a pair of lower girders 92a provided in parallel to the lower side of the support frame 92, and a cylinder rod 93a as an extendable rod thereof is provided so as to be able to extend and contract upward. A base end portion of each lower hydraulic cylinder 94 is fixed to an upper girder 92b provided in parallel on the upper side of the support frame 92, and a cylinder rod 94a as a telescopic rod thereof.
Is provided so that it can extend and contract downward. FIG. 20 shows a positional relationship in plan view regarding each upper hydraulic cylinder 93, each lower hydraulic cylinder 94, lower girder 92a, and upper girder 92b in the support frame 92.

The upper chuck 95 is fixed to the tip of the cylinder rod 93a of each upper hydraulic cylinder 93, and the lower chuck 96 is fixed to the tip of the cylinder rod 94a of each lower hydraulic cylinder 94. The turning chuck 97 is
It is fixed to the main body of the support frame 92. Each chuck 95-97
Are arranged with the same axis as the elevating column 98. The mixer 4 is attached to the lower end of the elevating column 98. FIG.
As shown in, the cylinder rod 93a of each upper hydraulic cylinder 93 expands and contracts, so that the upper chuck 95 moves up and down above the support frame 92. Similarly, as shown in FIG. 19, the cylinder rod 9 of each lower hydraulic cylinder 94 is
The lower chuck 96 moves up and down below the support frame 92 as the 4a expands and contracts.

Each of the chucks 95 to 97 is hydraulically driven so as to sandwich or lift the lifting column 98. FIG. 22 shows each chuck 95-9.
7 is a plan view and FIG. 23 is a side view of the chucks 95 to 97. Each chuck 95-97 includes a support plate 99,
A pair of clamping arms 100 and 101 and a hydraulic cylinder 10
2 and. The base ends of the two holding arms 100 and 101 are rotatably attached to the support plate 99 via a support shaft 103. The tip of one holding arm 100 is
At the base end of the hydraulic cylinder 102, the other holding arm 10 is provided.
The tip of the cylinder rod 1 is a cylinder rod 1 of the hydraulic cylinder 102.
Each of the tip ends of 02a is rotatably connected via a support shaft 104. Both holding arms 100, 101 have arc-shaped holding portions 100a, 101a for holding the outer periphery of the elevating column 98 in the middle portions thereof. Therefore, FIG.
As shown by the solid line, when the cylinder rod 102a of the hydraulic cylinder 102 is contracted, both clamping portions 100a,
101a is closed and the elevating column 98 is clamped, and as shown by the chain double-dashed line in FIG. 22, the cylinder rod 102a extends so that both clamping parts 100a, 101a are opened and the elevating column 98 is separated.

As described above, each of the chucks 95 to 97 has a holding mechanism of the same structure, but the turning chuck 97 is
In addition to the sandwiching mechanism, the rotating mechanism 113 shown in FIG. 24 is also provided. The rotation mechanism 113 is for rotating the mixer 4 around an axis line that is perpendicular to the ground surface.
As shown in FIG. 24, the rotating mechanism 113 is provided rotatably below the connecting portion 113B with the support frame 92, the fixed portion 113A provided below the connecting portion 113B, and the fixed portion 113A. And a rotating unit 113C. Fixed part 1
A fixed arm 113D protruding outward is attached to 13A. The rotating arm 113C includes a fixed arm 113.
A rotary arm 113E that is protruded outwardly corresponding to D is attached. At the tip of the fixed arm 113D, a base end of a turning hydraulic cylinder 113F as a horizontal turning telescopic unit is rotatably attached. The hydraulic cylinder 113F is provided with a cylinder rod 113G as a telescopic rod that can expand and contract by hydraulic pressure. Cylinder rod 113G
Is rotatably attached to the tip of the rotary arm 113E.

According to the rotating mechanism 113 having the above-described structure, the cylinder rod 113G of the hydraulic cylinder 113F extends in the direction of arrow C, so that the rotating portion 113C rotates in the direction of arrow E via the rotating arm 113E. This rotation causes the mixer 4 to rotate in the same direction by a predetermined angle. On the other hand, when the cylinder rod 113G of the hydraulic cylinder 113F contracts in the direction of arrow D, the rotating portion 113C rotates in the direction of arrow F via the rotating arm 113E. This rotation causes the mixer 4 to rotate in the same direction by a predetermined angle. FIG. 21 shows a turning hydraulic cylinder 113F in the rotating mechanism 113. In the turning chuck 97,
The lifting column 98 is clamped by the clamping mechanism, and the hydraulic cylinder 113F for rotation is driven in a state where the mixer 4 is arranged vertically to the ground surface, whereby the lifting column 98 is rotated and provided at the lower end thereof. The mixer 4 is rotated integrally with the elevating column 98 at a fixed position around an axis perpendicular to the ground surface. As a result, the orientation of the mixer 4 can be freely changed within the range of the predetermined angle at the fixed position. Further, when it is desired to change only the direction of the mixer 4 at the same excavation position, the direction of the mixer 4 can be changed without moving the backhoe 1. in this way,
In order to change the direction of the mixer 4 in the horizontal direction, horizontal rotating means for rotating the elevating column 92 in the horizontal direction about its axis is configured.

Incidentally, even in the ground improvement device of this embodiment,
Similar to that of the first embodiment, the elevating column 98 is set to a length according to a different required improvement depth for ground improvement by shortening by partial excision or extension by partial addition. ing. Further, also in this ground improvement device, as in the first embodiment, the lifting column 98
Is formed into a hollow shape, and a supply pipe (not shown) for supplying all or any one of the material and hydraulic oil required for ground improvement to the mixer 4 is housed in the hollow portion. .

Next, the procedure for lowering the mixer 5 with the maximum stroke by using the elevator 90 described above will be described. 15 and 16
(A) shows a state before the descent is started. In this state,
The elevating column 98 is erected vertically to the ground surface, the cylinder rod 93a of each upper hydraulic cylinder 93 is extended, and the cylinder rod 94a of each lower hydraulic cylinder 94 is contracted. In this state, the upper chuck 95 is opened,
The lower chuck 96 is closed. From this pre-start state,
As shown in FIG. 16B, each process up to the completion of descent will be described with reference to FIGS. 17A to 17E.

First, FIG. 17 (a) shows the same state as in FIG. 16 (a) before the descent is started. From this state, the cylinder rod 94a of each lower hydraulic cylinder 94 is extended while operating the mixer 4. By this first step, the elevating column 98 clamped by the lower chuck 96 descends by the extension of the cylinder rod 94a, the mixer 4 digs to the depth D1, and the state shown in FIG. can get.

Next, from the state shown in FIG. 17B, the upper chuck 95 is closed, the lower chuck 96 is opened, and the cylinder rod 9 of each of the upper and lower hydraulic cylinders 93, 94.
Shrink 3a and 94a respectively. By this second step, the elevating column 98 clamped by the upper chuck 95 descends by the amount of contraction of the cylinder rod 93a, the mixer 4 digs to the depth D2, and the state shown in FIG. can get.

Next, from the state shown in FIG. 17C, the upper chuck 95 is opened, the lower chuck 96 is closed, and the cylinder rod 9 of each of the upper and lower hydraulic cylinders 93, 94.
3a and 94a are extended. By this third step, the elevating column 98 clamped by the lower chuck 96 descends by the extension of the cylinder rod 94a, the mixer 4 digs to the depth D3, and the state shown in FIG. can get.

Finally, from the state shown in FIG. 17 (d), the upper chuck 95 is closed, the lower chuck 96 is opened, and the cylinder rods 93a, 94a of the upper and lower hydraulic cylinders 93, 94 are contracted, respectively. By the fourth step, the elevating column 98 clamped by the upper chuck 95 descends by the amount of contraction of the cylinder rod 93a, the mixer 4 digs to the depth D4, and the state shown in FIG. can get. This depth D4 corresponds to the maximum stroke that the elevator 90 can be used to lower the mixer 4.

In this embodiment, as described above, the lifting column 98 is sandwiched by the upper chuck 95 or the lower chuck 96 provided on the cylinder rods 93a, 94a of the upper or lower hydraulic cylinders 93, 94. By expanding and contracting the corresponding cylinder rods 93a, 94a, the elevating column 98 is moved up and down together with the mixer 4. More specifically, the upper chuck 95 and the lower chuck 96 are alternately closed to sandwich the elevating column 98, and one of the chucks 95 and 96 is moved up and down by the expansion and contraction of the corresponding cylinder rods 93a and 94a, thereby mixing. The elevator pillar 98 is continuously moved up and down together with the machine 4. ,

In this embodiment, in order to lower the mixer 4 by the maximum stroke as described above, the first to fourth steps can be continuously performed. On the other hand, in order to raise the mixer 4 vertically with respect to the ground, the above first to fourth steps may be performed in reverse order.

In order to rotate the mixer 4 about the elevating column 98, the upper and lower chucks 95 and 96 are opened, the turning chuck 97 is closed, and the turning hydraulic cylinder 113F is operated. As a result, the mixer 4 is rotated in the horizontal direction at the same position and the same height by a predetermined angle.

As described above, also in the ground improvement apparatus of this embodiment, the mixer 4 is provided on the arm 2 of the backhoe 1 via the elevator 90. Therefore, by stopping the backhoe 1 at a predetermined position on the site and operating the hydraulic cylinders 93, 94 and the chucks 95, 96, the elevating column 98 is moved up and down with respect to the support frame 92, and the elevating column 98 moves. The mixer 4 provided at the lower end is vertically moved up and down with respect to the ground. Therefore, only by operating the elevator 90 while pushing the mixer 4 against the ground and operating it, the ground is agitated by the mixer 4 as the elevator pillar 98 descends, and the improving material and the soft soil given to the ground are agitated and mixed. Then, one improved body is vertically installed. As a result, it becomes possible to easily lower and raise the mixer 4 while accurately maintaining the verticality, as compared with the case where only the arm 2 of the backhoe 1 is operated to lower and raise the mixer 4. Therefore, it becomes possible to easily and smoothly perform vertical construction of the improved body.

According to the ground improvement device of this embodiment,
With the upper chuck 95 or the lower chuck 96 closed and the lift column 98 is sandwiched, and the lift column 98 is vertically supported, the cylinder rods 93a and 94a of the upper hydraulic cylinder 93 or the lower hydraulic cylinder 94 are moved up and down the lift column 98. By elongating and contracting in the direction, that is, in the vertical direction, the lifting column 98 is lifted and lowered vertically with respect to the ground together with the mixer 4. Therefore, unlike the elevator 3 in the first embodiment, it is possible to omit the labor of attaching the driven chain along the longitudinal direction of the elevator column 98. This is convenient when exchanging the elevating columns 98 having different lengths, and it is not necessary to prepare and exchange a driven chain suitable for the length each time the elevating columns 98 are exchanged.

Particularly, according to this ground improvement device, FIG.
As described in accordance with (a) to (e), by using the upper and lower hydraulic cylinders 93, 94 and the upper and lower chucks 95, 96, the elevating column 98 continuously ascends and descends together with the mixer 4. Will be done. Therefore, it is possible to continuously excavate the ground by the mixer 4, and in this sense, the vertical construction of the improved body can be efficiently performed.

In the ground improvement device of this embodiment, since the lifting chuck 90 is provided with the turning chuck 97, by operating the chuck 97, the lifting pillar 98 is horizontally rotated about its axis. The orientation of the mixer 4 in the horizontal direction can be freely changed. Particularly, in the elevator 90 of this ground improvement device, the lifting rod 98 is sandwiched by the turning chuck 97, and the cylinder rod of the hydraulic cylinder 113F for turning is expanded and contracted, so that the lifting column 98 is lifted together with the turning chuck 97. Is rotated in the horizontal direction with respect to the support frame 92, whereby the mixer 4 is rotated in the horizontal direction. That is, the turning chuck 97
The hydraulic cylinder 113 with the lifting column 98 being clamped by the
By extending or contracting the cylinder rod of F,
The turning chuck 97 is turned forward. Next, by contracting or extending the cylinder rod of the hydraulic cylinder 113F in a state where the lifting chuck 98 is not clamped by the turning chuck 97, the turning chuck 97 is turned in the backward direction in the direction opposite to the forward direction. . Then, by repeating the forward rotation and the backward rotation as described above, the elevator pillar 98 together with the mixer 4 is rotated in the same direction without limitation. As a result, as in the first embodiment, the work efficiency of the lap construction can be improved. That is, the direction of the stirring blade 19 can be changed without moving the backhoe 1, and in that sense, the construction loss can be reduced and the ground improvement in a narrow place can be facilitated. Become.

In addition to this, in the ground improvement device of the present embodiment, the same operation and effect can be obtained for the same configuration as that of the first embodiment.

[Third Embodiment] Next, a third embodiment of the ground improvement device of the present invention will be described with reference to the drawings.

FIG. 25 shows a schematic structure of the ground improvement device of this embodiment. This ground improvement device uses a different elevator 200 different from the above-mentioned elevators 3 and 90, and the mixer 4
Is attached to the tip of the arm 2, which is different from the ground improvement devices of the first and second embodiments. The configuration of the mixer 4 of the present embodiment is the same as that of each of the above embodiments, and detailed illustration and description of the structure are omitted.

The elevator 200 is for raising and lowering the mixer 4 with respect to the ground. The elevator 2 is shown in FIGS.
00 configuration is shown. As shown in FIGS. 25 to 27, the elevator 200 includes an outer frame 201, an inner frame 202 rotatably assembled to the outer frame 201 in a horizontal direction, and a vertical frame fixed to the inner frame 202. The outer post 203 extending in the direction, the inner rod 204 as the elevating column of the present invention supported by the inner frame 202 so as to be able to ascend and descend along the inner side of the outer post 203, and the inner rod 2 thereof.
Screw jack 205 provided between the inner rod 204 and the outer post 203 in order to vertically drive 04, and a swing mechanism 20 for horizontally swinging the inner rod 204 together with the outer post 203.
6 and 6. In this embodiment, the outer frame 201 and the inner frame 2
02 and the outer post 203 constitute a support frame of the present invention for supporting the inner rod 204 so that it can be raised and lowered. Furthermore, in this embodiment, the outer frame 201, the inner frame 202, the outer post 203, and the screw jack 205 constitute the lifting drive mechanism of the present invention for driving the inner rod 204 up and down.

As shown in FIGS. 25 and 26, the outer frame 201
Is arranged near the tip of the arm 2 and on the side of the arm 2 and is attached to the arm 2. Outer post 203
Is a metal frame tower structure. Outer post 20
3 includes a first frame 207 for accommodating / guiding the inner rod 204, and a second frame 208 arranged on the front side of the first frame 207 for accommodating / guiding the hose 209. The inner rod 204 forms a tubular body having a rectangular cross section. The mixer 4 is attached to the lower end of the inner rod 204. Each hose 209
Is for supplying to the mixer 4 the materials, hydraulic oil and the like necessary for ground improvement, as in the first embodiment. As shown in FIGS. 25 to 28, a part of these hoses 209 is housed and arranged in the hollow portion of the inner rod 204, and one end thereof is connected to the mixer 4.

As shown in FIG. 27, in this embodiment,
The screw jack 205 includes a hydraulic motor 210 fixed to the inner upper end of the first frame 207 of the outer post 203, and a gear box fixed to the inner upper end of the outer post 203 and drivingly connected to the output shaft of the hydraulic motor 210. 211, a screw rod 212 that is disposed inside the outer post 203 along the central axis thereof, and has one end drivingly connected to and supported by the gearbox 211, and is fixed to the upper end of the inner rod 204, and the screw rod. And a screw bearing 213 fitted on the surface 212. A spiral screw groove 212 a is formed on the outer periphery of the screw rod 212. A screw groove (not shown) that matches the screw groove 212a is formed on the inner circumference of the screw bearing 213. Therefore, when the hydraulic motor 210 is driven, the screw rod 212 rotates via the gear box 211, and the screw bearing 2 moves on the rod 212.
13 moves. With the movement of the screw bearing 213, the inner rod 204 is driven up and down along the outer post 203 between the lowermost position shown by the solid line and the uppermost position shown by the two-dot chain line in FIG.

As shown in FIGS. 28 to 30, the turning mechanism 20 is provided.
Reference numeral 6 denotes a hydraulic motor 214 as a drive source attached to the outer frame 201, and an output shaft 214 of the hydraulic motor 214.
The drive gear 215 fixed to a and the driven gear 216 fixed to the inner frame 202 and connected to the drive gear 215 are provided. The inner frame 202 includes a tubular body 217 that penetrates the inner rod 204, and a flange 218 fixed to the upper end of the tubular body 217. The outer frame 201 includes a ring body 219 arranged on the outer periphery of the inner frame 202, a motor bracket 220 fixed to the ring body 219 to support the hydraulic motor 214, and a ring body to be attached to the arm 2 of the backhoe 1. And an arm bracket 221 fixed to 219. The driven gear 216 is the flange 218 of the inner frame 202.
Fixed to the underside of. The inner peripheral surface of the driven gear 216 is
It is provided so as to be rotatable relative to the outer frame 201 via a swivel bearing 222 fixed to the upper end of the ring body 219 of the outer frame 201. Therefore, when the hydraulic motor 214 is driven, the drive gear 215 rotates, the driven gear 216 rotates, and the inner frame 202 rotates in the horizontal direction with respect to the outer frame 201 together with the outer post 203 and the inner rod 204. In this embodiment, the swiveling mechanism 206 corresponds to the horizontal rotating means of the invention for horizontally rotating the mixer 4 about the axis of the inner rod 204. The drive gear 215 corresponds to the drive unit of the present invention, and the driven gear 21.
6 corresponds to the driven portion of the present invention, and the hydraulic motor 214 corresponds to the motor of the present invention.

As shown in FIGS. 27 to 30, at the upper end of the flange 218 of the inner frame 202, a total of four guide rollers 2 corresponding to the square of the inner rod 204 having a quadrangular cross section is formed.
23 are arranged. Each guide roller 223 is fixed to the flange 218 via a bracket 224.
Similarly, at the lower end of the inner frame 202, the inner rod 204
A total of four guide rollers 223 corresponding to the squares are arranged. Each guide roller 223 has a bracket 22
It is fixed to the cylindrical body 217 of the inner frame 202 via the connector 4. The upper and lower matching rollers 223 are connected to the inner rod 204.
Is for guiding the vertical movement of the vertical movement.

As shown in FIG. 27, a scraper 225 for scraping off mud or the like adhering to the outer surface of the inner rod 204 is provided below each guide roller 223 provided on the lower side of the inner frame 202. As shown in the conceptual diagrams of FIGS. 31 and 32, the support shaft 223a of the guide roller 223 is
Another bracket 226 is attached, and a pair of plates 226a, 2 provided at the lower end of the bracket 226 is attached.
A scraper 225 is supported via bolts 227 between 26b. In this way, the scraper 225 becomes
The outer surface of the inner rod 204 is slidably provided.

As described above, also in the ground improvement apparatus of this embodiment, the mixer 4 is provided on the arm 2 of the backhoe 1 via the elevator 200. Therefore, the backhoe 1 is stopped at a predetermined position on the site and the hydraulic motor 2
By operating 10, the inner rod 204 is moved up and down along the outer post 203 and the inner frame 202, and the mixer 4 provided at the lower end of the rod 204 is moved vertically up and down with respect to the ground. Therefore, only by operating the elevator 200 while operating the mixer 4 by pushing it against the ground, the ground is agitated by the mixer 4 as the inner rod 204 descends, and the improving material and the soft soil given to the ground are agitated and mixed. Then, one improved body is vertically installed. As a result, it becomes possible to easily lower and raise the mixer 4 while accurately maintaining the verticality, as compared with the case where only the arm 2 of the backhoe 1 is operated to lower and raise the mixer 4. Therefore, it becomes possible to easily and smoothly perform vertical construction of the improved body.

According to the ground improvement device of this embodiment,
By operating the screw jack 205, the inner rod 204 is raised and lowered while being supported by the outer post 203 and the like, and accordingly, the mixer 4 is continuously raised and lowered vertically to the ground. Therefore, it is possible to continuously excavate the ground by the mixer 4, and in this sense, the vertical construction of the improved body can be efficiently performed. In addition, in this embodiment, by operating the screw jack 205, the inner rod 204 is moved up and down along the outer post 203 while being guided by each guide roller 223. The accuracy can be improved.

In this embodiment, the inner rod 20
When the rod 4 is moved up and down, the scraper 225 scrapes off the mud attached to the outer surface of the rod 204, especially the square. Therefore, between the inner rod 204 and each guide roller 223, between the inner rod 204 and the inner frame 20.
No mud or the like will be caught between the two and the smooth movement of the inner rod 204 will not be impaired by the mud or the like.

In the ground improvement device of this embodiment, since the elevator 200 is provided with the turning mechanism 206, the inner rod 204 is horizontally rotated about its axis by the mechanism 206, so that the mixer 4 moves horizontally. The orientation in the direction can be changed freely. Therefore, as in the first and second embodiments, the work efficiency of lap construction can be improved. That is, the direction of the stirring blade 19 can be changed without moving the backhoe 1, and in that sense, construction loss can be reduced and ground improvement in a narrow place can be facilitated.

The present invention is not limited to the above-mentioned embodiments, but can be carried out as follows within the scope of the invention.

(1) In each of the above-described embodiments, the lifting drive mechanism is constituted by the driven chain 38, the drive sprocket 39, the pressing roller 40, the motor 41, etc., and the upper and lower hydraulic cylinders 93, 94 and the upper and lower hydraulic cylinders 93, 94. Although the lower chucks 95, 96 and the like are used, the present invention is not limited to these structures.

(2) In each of the above-mentioned embodiments, the horizontal rotating means is the driven sprocket 42, the drive sprocket 43,
Composed of a motor 44 and a drive chain 45,
Although it is configured by the turning chuck 97, it is not limited to these configurations.

(3) In each of the above-described embodiments, the mixer 4 attached to the elevator 3 is embodied as a mixer having a stirring chain 18 and a stirring blade 19 which are rotationally driven in the vertical direction. On the other hand, a mixer equipped with a rotating shaft that is vertically pierced to the ground and a plurality of stirring blades that are horizontally rotated at the lower end of the shaft, or a support frame that is vertically pierced to the ground is used. It can also be embodied as a mixer equipped with a plurality of stirring blades that coaxially rotate in the vertical direction at the tip of the frame.

(4) In the first or second embodiment, a cover for covering the mixer 4 may be provided.

(5) In the second embodiment, the upper and lower hydraulic cylinders 93, 94 are provided in the support frame 92 as the lifting drive mechanism, and the upper and lower hydraulic cylinders 9 are provided.
Upper and lower chucks 95, 96 corresponding to 3, 94
And each chuck 95, 96 is configured to be movable in the vertical direction. On the other hand, one of the upper chuck and the lower chuck may be fixed to the support frame, and only the other chuck may be movable in the vertical direction by the hydraulic cylinder.

(6) The following structure can be added to the ground improvement device of each of the above-mentioned embodiments. That is, FIG.
As shown in, the mixer 4 is provided on the arm 2 of the backhoe 1 as a construction work machine, and the inclinometer 140 for measuring the verticality of the mixer 4 is provided. According to this configuration, the operator of the panel improvement device can know the verticality of the mixer 4 by reading the measurement result of the inclinometer 140. Therefore, it is not necessary to separately arrange personnel to measure the verticality of the mixer 4. As a result, the workability of ground improvement can be improved.

(7) The ground improvement device of the second embodiment can be used to perform ground improvement as shown in FIG.

(8) In the ground improvement device of each of the above-mentioned embodiments, the elevators 3, 90, 200 are arranged near the tip of the arm 2 and beside the arm 2 and attached to the arm 2. May be disposed near the tip of the arm and in front of the arm and attached to the arm.

[0090]

According to the ground improvement device of the invention described in claim 1, the ground is agitated with the descending of the elevating column only by operating the elevating drive mechanism while driving the agitating section of the mixer, and the ground is agitated. The given improvement material and soft soil are mixed by stirring, and one improvement body is vertically constructed. As a result, the effect that the vertical construction of the improved body can be performed easily and efficiently is exhibited . Also, the operation of the elevator is a guide roller,
Driven chain, drive sprocket, pressure roller and model
Data is embodied by the data. In addition, the driven chain drives
Difficult to fall off the sprocket, and driven chain and drive
It becomes difficult for dirt to be caught in the connection part with the sprocket.
Therefore, the durability of the elevator can be improved.
Be effective. Furthermore, to activate the horizontal rotation means.
Allows the mixer to rotate horizontally around the axis of the lifting column.
And the horizontal orientation of the mixer can be freely changed.
It Therefore, it is possible to reduce construction loss during ground improvement.
It is possible that the plane improvement axis of the polygon improvement method is not straight.
Ground improvement of complicated and complicated plane shape, and ground improvement in a narrow space
Has the effect of making it easy
It In addition, no matter how the arm is moved,
The movement of the arm without the mixer interfering with the arm
Is not restricted by lifts and mixers. This
Therefore, it is possible to increase the freedom of movement of the elevator and mixer.
It is possible to improve the ground improvement within a predetermined range centered on the backhoe.
The effect that can be implemented efficiently
It

In the ground improvement device according to the second aspect of the present invention, the elevating column is continuously moved up and down together with the mixer. As a result, it is possible to carry out the excavation of the ground by the mixed-machine continuously exerts an effect that it is possible to smoothly perform the normal construction of the improved body. Also, activate the horizontal rotation means.
This allows the mixer to move horizontally around the axis of the lifting column.
Is turned to, and the horizontal orientation of the mixer can be freely changed.
available. Therefore, the construction loss at the time of ground improvement is reduced.
It is possible, and the plane improvement axis of the polygon improvement method etc. is straight
Not complicated ground improvement of the ground shape,
It has the effect of making it easier to improve the board.
Volatile. In addition, no matter how the arm is moved,
And the mixer does not interfere with the arm
Movement shall not be restricted by elevators and mixers.
Yes. For this reason, the freedom of movement of the elevator and mixer is increased.
It is possible to improve the ground within a predetermined range centered on the backhoe.
Has the effect that good can be implemented more efficiently
Volatile.

[0092] In soil improvement apparatus of the invention described in claim 3, the excavation of the ground by the mixed-machine can be continuously carried out, to exert an effect that it is possible to smoothly perform the normal construction of the improved body. Also, to activate the horizontal rotation means
The mixer is rotated horizontally around the axis of the lifting column.
And the orientation of the mixer in the horizontal direction can be freely changed.
It For this reason, it is possible to reduce the construction loss at the time of ground improvement
It is possible that the plane improvement axis of the polygon improvement method is not straight.
Ground improvement of complicated and complicated plane shape, and ground improvement in a narrow space
Has the effect of making it easy
It In addition, no matter how the arm is moved,
The movement of the arm without the mixer interfering with the arm
Is not restricted by lifts and mixers. This
Therefore, it is possible to increase the freedom of movement of the elevator and mixer.
It is possible to improve the ground improvement within a predetermined range centered on the backhoe.
The effect that can be implemented efficiently
It

In the ground improvement device according to the fourth aspect of the present invention, the function and effect of the ground improvement device according to the third aspect can be obtained by the embodied horizontal rotating means.

In the ground improvement apparatus according to the fifth aspect of the invention, the function and effect of the ground improvement apparatus according to the first aspect can be obtained by the embodied horizontal rotating means.

In the ground improvement device according to the sixth aspect of the invention, the function and effect of the ground improvement device according to the second aspect can be obtained by the embodied horizontal rotating means.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a ground improvement device according to a first embodiment.

FIG. 2 is also a schematic configuration diagram showing a ground improvement device.

FIG. 3 is a partially cutaway plan view showing how the elevator is attached to the arm.

FIG. 4 is a side view showing a state where the elevator of FIG. 3 is viewed from a D direction.

FIG. 5 is likewise a vertical cross-sectional view showing an elevator.

FIG. 6 is likewise a cross-sectional view taken along the line EE of FIG.

FIG. 7 is an enlarged sectional view of a portion surrounded by a circle in FIG.

FIG. 8 is likewise a cross-sectional view taken along the line AA of FIG.

FIG. 9 is likewise a sectional view taken along the line BB of FIG.

10 is likewise a bottom view taken along the line CC of FIG.

FIG. 11 is likewise a cross-sectional view showing a lifting column.

12 (a) and 12 (b) are schematic configuration diagrams of the ground improvement device showing a state in which an elevator column and a driven chain of different sizes are attached to the elevator.

13 (a) and 13 (b) are plan views showing construction using the ground improvement device.

FIG. 14 is likewise a plan view showing a polygon improving method which is performed using the ground improving apparatus.

FIG. 15 is a schematic configuration diagram showing a ground improvement device according to the second embodiment.

16 (a) and 16 (b) are front views showing the operation of the elevator and the like.

17 (a) to 17 (e) are front views showing a series of operations of the elevator and the like.

FIG. 18 is likewise a front view showing the configuration of the elevator.

FIG. 19 is likewise a front view showing the configuration of an elevator.

FIG. 20 is likewise a plan view showing the arrangement of the hydraulic cylinders of the elevator.

FIG. 21 is a plan view showing the arrangement of the turning hydraulic cylinders of the elevator.

FIG. 22 is a plan view showing the structure of the chuck of the elevator.

FIG. 23 is likewise a front view showing the structure of the chuck of the elevator.

FIG. 24 is a plan view showing the structure of the rotating mechanism of the elevator.

FIG. 25 is a schematic configuration diagram showing a ground improvement device according to the third embodiment.

FIG. 26 is likewise a front view showing an elevator and a mixer.

FIG. 27 is likewise a side view showing a partially broken structure of the elevator.

FIG. 28 is likewise a plan view showing a turning mechanism and the like with a part thereof broken away.

FIG. 29 is a side view showing a turning mechanism and the like in a partially broken manner.

FIG. 30 is likewise a front view showing a turning mechanism and the like.

FIG. 31 is also a side view conceptually showing the structure of the scraper.

FIG. 32 is likewise a plan view showing a scraper.

FIG. 33 is a schematic configuration diagram showing a ground improvement device according to another embodiment.

FIG. 34 is a schematic configuration diagram showing a conventional ground improvement device.

FIG. 35 is a schematic configuration diagram showing another conventional ground improvement device.

[Explanation of symbols]

1 backhoe Two arms 3 elevators 4 mixer 18 stirring chain 19 Stirrer (18 and 19 compose stirrer) 31 Support frame 32 lifting columns 33 Lifting drive mechanism 34 outer frame 35 Inner frame 37 Guide roller (guide part) 38 Driven chain (connecting means) 39 Drive sprocket (drive unit) 40 Pressing roller (pressing part) 41 motor 42 Driven sprocket (driven part) 43 Drive sprocket (drive unit) 44 motor 45 drive chain 46 First supply pipe 47 Second supply pipe 48 Third supply pipe 49 Fourth supply pipe 90 elevator 92 Support frame 93 Upper hydraulic cylinder (elevating part for lifting) 93a Cylinder rod (expandable rod) 94 Lower hydraulic cylinder (elevating telescopic part) 94a Cylinder rod (expandable rod) 95 Upper chuck (upper clamping part) 96 Lower chuck (lower clamp) 97 Rotating chuck (holding part) 201 outer frame 202 inner frame 204 Inner rod (elevation column) 205 screw jack 206 Turning mechanism (horizontal turning means) 210 hydraulic motor 211 gearbox 212 screw rod 213 screw bearing 214 hydraulic motor 215 Drive gear (drive unit) 216 Driven gear (driven part)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-10-227028 (JP, A) JP-A-10-219734 (JP, A) JP-A-7-279157 (JP, A) JP-A-9- 184132 (JP, A) JP-A-10-68124 (JP, A) Actually developed 62-103838 (JP, U) Actually published 50-12888 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 3/12 102-103

Claims (6)

(57) [Claims] 1. A improver provided with a mixer including a rotationally driven stirrer, the mixer being pushed against the ground to drive the stirrer to stir the ground and to provide the ground. In a soil improvement device configured to stir and mix soft soil, an elevator for vertically moving the mixer vertically to the ground, the elevator is a support frame, and is supported so as to be vertically movable with respect to the support frame. And a lowering column to which the mixer is attached at a lower end thereof, and an elevating and lowering driving mechanism for vertically moving the elevating and lowering column; A guide roller for guiding the movable guide chain, a driven chain stretched along the longitudinal direction of the lifting column, a drive sprocket connected to the driven chain between the lifting column and the driven chain, and A pair of pressing rollers arranged above and below the drive sprocket to press the driven chain between the drive sprocket and the drive sprocket; and a motor for rotating the drive sprocket; And a horizontal rotating means for rotating in the horizontal direction about the axis of, the elevator is attached to a construction work machine, the construction work machine is a backhoe including an arm capable of turning and vertical movement. A ground improvement device, characterized in that the elevator is arranged near the tip of the arm and laterally of the arm and attached to the arm. 2. A improver which is provided with a mixer including a stirring section which is rotationally driven, and which stirs the ground by driving the mixer by pushing the mixer against the ground to drive the stirring section. In a soil improvement device configured to stir and mix soft soil, an elevator for vertically moving the mixer vertically to the ground, the elevator is a support frame, and is supported so as to be vertically movable with respect to the support frame. And a lowering column to which the mixer is attached at a lower end thereof, and an elevating and lowering driving mechanism for vertically moving the elevating and lowering column; An upper hydraulic cylinder and a lower hydraulic cylinder that include a telescopic rod that expands and contracts in a direction in which the upper and lower rods are clamped, and an upper chuck and a lower chuck that are provided to clamp the elevating column between upper and lower positions. And a lower chuck is provided on the telescopic rod of the lower hydraulic cylinder, wherein the upper chuck and the lower chuck are alternately closed to provide the lifting column. And vertically moving the at least one of the chucks by expanding and contracting the telescopic rod of the corresponding hydraulic cylinder so as to continuously elevate the elevating column together with the mixer. And a horizontal rotating means for horizontally rotating about the axis of the elevating column, the elevating machine is attached to a construction work machine, and the construction work machine is capable of turning and vertical movement. A backhoe including an arm, wherein the elevator is mounted on the arm by arranging the elevator near the tip of the arm and on the side of the arm. Soil improvement and wherein the digit. 3. An improving material provided with a mixer including a rotationally driven stirring section, the mixer being pushed against the ground to drive the stirring section, thereby stirring the ground and imparting the ground to the ground. In a soil improvement device adapted to stir and mix soft soil, an elevator for vertically elevating the mixer with respect to the ground, the elevator, an elevating column to which the mixer is attached at the lower end, the elevating and lowering An elevating and lowering drive mechanism for vertically moving the column; the elevating and lowering drive mechanism includes a support frame for supporting the elevating and lowering column so that the elevating and lowering column can be vertically moved; A screw jack provided between the support frame and the support frame; the screw jack being fixed to the support frame; and the hydraulic motor fixed to the support frame. A gear box drivingly connected to the output shaft; a screw rod disposed along the central axis of the support frame and having one end drivingly connected to the gear box; and a screw rod fixed to the elevating column and on the screw rod. And a horizontal rotation means for horizontally rotating the mixer about an axis of the elevating column, and mounting the elevator on a construction work machine. The construction work machine is a backhoe including an arm capable of turning and moving up and down, and the elevator is attached to the arm by arranging the elevator near a tip of the arm and laterally of the arm. A characteristic ground improvement device. 4. The ground improvement device according to claim 3, wherein the outer frame is attached to a predetermined mounting body, and the outer frame is rotatably attached to the outer frame in a horizontal direction.
An inner frame that supports the elevating column, wherein the horizontal rotation unit includes a driven unit provided on an outer periphery of the inner frame, and a driving unit provided on the outer frame and connected to the driven unit. A ground improvement device, comprising: a motor provided on the outer frame and configured to rotate the drive unit. 5. The ground improvement device according to claim 1, wherein the outer frame is attached to a predetermined mounting body, and the outer frame is rotatably attached to the outer frame in a horizontal direction.
An inner frame that supports the elevating column and the horizontal rotating unit, wherein the horizontal rotating unit includes a driven unit provided on an outer periphery of the inner frame, a driving unit provided on the outer frame, and A ground improvement device, comprising: a motor provided on an outer frame for rotating the drive unit; and a connecting means for connecting the driven unit to the drive unit. 6. The ground improvement device according to claim 2, further comprising a support frame attached to a predetermined mounting body, wherein the horizontal rotation means is provided so as to be horizontally rotatable with respect to the support frame. A holding unit for holding the lifting column, and a horizontal rotation telescopic unit provided on the support frame and including a telescopic rod that extends and contracts to rotate the holding unit in the horizontal direction. A characteristic ground improvement device.