JPH0738368Y2 - Ground improvement machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a ground improvement machine for mixing a hardening agent such as cement milk into soft ground or the like, and more particularly to a positioning mechanism for a stirring shaft.

(Prior Art) As shown in the plan view of FIG. 5, a conventional ground improvement machine is provided with one or more in front of an upper revolving structure 3 installed on a lower traveling structure 1 through a revolving device 2. As described above, the reader 5 for guiding the two stirring shafts 4 is attached, and the lower end of the stirring shaft 4 is provided with a stirring blade having a rotating region as indicated by a circle 6. The stirrer shaft 4 is lowered while pouring the curing agent into the ground, and the soil in which the curing agent is injected is stirred by the stirring blades to uniformly disperse the curing agent.

Such a ground improvement machine performs work in the order shown in FIG. 5 or FIG. 6, for example. The example in FIG.
This is a method of performing work while changing the work point by retracting the ground improvement machine in the direction of arrow a. When the work is stopped, the upper swing body 3 is swung to rotate the leader 5 and the stirring shaft 4 from the b position around the center to the left and right c, Swing to the d position, press the stirring shaft 4 into the ground and stir at each position. When the work at these points is completed, the lower traveling body 1 is driven and the ground is moved by a distance close to the diameter of the circle 6. The improved machine is moved in the direction of arrow a, and the same work is repeated. The method shown in FIG. 5 is a method used when the improved land is narrow.

In addition, Fig. 6 shows the target improvements e, f, g along the line h.
This is a method in which the work points are moved by running the ground improvement machine along the direction a (these points are marked in advance before work).

(Problems to be solved by the invention) However, according to this conventional ground improvement machine, in the case of FIG.
It is not possible to improve the areas near the boundary 7a indicated by the shaded areas A and B where the work is performed first. In order to improve the A and B areas, the ground improvement machine can be moved to the right and left sides of the drawing, but since there is an obstacle 8 near the boundary line 7b of the land to be improved,
When the ground improvement machine cannot cross the boundary line 7b, it is impossible to work in the area A of the corner portion 7c, and even if there is no obstacle 8 and work is possible, Since the position has to be changed in the width direction of the lower traveling body 1, there is a problem that it is difficult to adjust the position of the stirring shaft 4.

Further, in the case of FIG. 6, when the stirring shaft 4 should be located at the center of the area indicated by the chain double-dashed line f as shown in FIG. The position of the stirring shaft 4 must be adjusted by trial and error by the operation of the traveling motor and the operation of the turning motor of the turning device 2, and there is a problem that the position of the stirring shaft 4 is difficult.

Further, conventionally, when the position of the stirring shaft 4 is deviated, as described above, the traveling motor of the lower traveling body 1 and the swing motor of the swinging device 2 are operated to align the stirring shaft 4 and the outrigger. Is extended and fixed, and the vertical posture of the leader 5 is held by operating a cylinder (not shown) of the back stay.
Since the ground to be improved has unevenness, it is difficult to run the ground improving machine in a straight line.
It is necessary to perform the position alignment and the vertical posture of the reader 5 each time the working point is moved. Therefore, there is a problem that work efficiency is poor.

The present invention has been made in view of these problems,
It is an object of the present invention to provide a ground improvement machine that enables improvement of the ground in a corner portion, enables quick and easy positioning of the stirring shaft and posture control, and achieves improvement in work efficiency.

(Means for Solving the Problem) In order to achieve this object, the ground improvement machine of the present invention has a frame projecting from the front of an upper revolving structure installed on a lower traveling structure via a revolving device, A movable support that is moved back and forth by a drive is attached to the frame, a turning device with a drive is installed on the movable support, and a leader that is attached to a swivel body of the turning device so that it can be tilted back and forth and left and right, The undulating drive device of the leader and the left and right tilting drive device of the leader are independently installed, and a plurality of stirring shafts are attached so as to be vertically movable along the leader. A plurality of the stirring blades are provided, and the leader is not limited to a circular shape, but a rectangular shape or the like is used.

(Operation) After pushing the stirring shaft and injecting the hardening agent with the upper revolving structure in the same direction as the direction of the ground improvement machine or in a direction that makes a right angle to the ground improvement machine, The swivel is activated to swing the upper swing structure to the left (or right), the movable support is pushed forward, the swivel on the movable support is activated, and the next improvement point is one row across from the previous improvement point. Set to line up with, push in the agitator, inject the curing agent,
Next, the upper revolving structure is swung to the right (or left), the revolving device on the movable support is operated in the opposite direction to set the next improvement point, and the three improvement points are placed on the straight line.
The order of this improvement may be left (or right), center, right (or left). Further, the posture of the leader before the pushing of the stirring blade is set such that the leader raising and lowering drive device and the left and right tilting drive device, which are independently provided, are operated so that the leader takes a vertical posture. .

(Embodiment) FIG. 1 and FIG. 2 are a side view and a front view showing an embodiment of a ground improvement machine according to the present invention, respectively, and the same symbols as those in FIG. 5 and FIG. 6 are the components having the same functions. Is. In FIGS. 1 and 2, reference numeral 10 denotes a frame projecting from the front of the upper swing body 3, and a movable support base 11 is mounted on the frame 10 so as to be movable back and forth. A hydraulic cylinder 12 for moving the movable support base 11 back and forth is interposed between and.

A swing device 14 having a swing hydraulic motor 13 is installed on the movable support 11. In the swivel body 14a of the swivel device 14,
The first bracket 15 for supporting the leader is fixed, and the bracket is fixed.
2nd to be able to undulate in the front-back direction centering on the horizontal pin 16
Attach the bracket 17 and attach the vertical pin 18 to the second bracket 17.
As shown in FIG. 3, a reader 19 having a rectangular cross section is attached so as to be tiltable around the center. First bracket 15
A hydraulic cylinder 20 for undulating the leader 19 is attached between the leader 19 and the leader 19. In this case, in order to allow the left and right tilting of the leader 19, the connecting portion of the hydraulic cylinder 20 by the pins 21 and 22 is structured to allow the left and right tilting with respect to the pins 21 and 22. Further, between the left and right end portions of the second bracket 17 and the left and right side surfaces of the leader 19, hydraulic cylinders 31 and 31 for tilting the leader 19 to the left and right are attached. A drive device 23 for inserting and rotating the two stirring shafts 4 is attached to each stirring shaft 4.
A stirring blade 24 is detachably attached to each of the lower ends of the.

Further, the leader 19 is provided with a rotary chuck device 25 for pushing the stirring shaft 4 up and down along a guide 19a provided on the leader 19 (the guide is formed of a steel rib unlike the conventional pipe). A drive sprocket that is freely mounted and rotated by a motor 26 attached to the lower back side of the reader 19.
A chain 29 is hooked on a driven sprocket 28 mounted on the upper end of the reader 27 and the leader 19, and the chain 29 is connected to the rotary chuck device 25. A hose (not shown) for supplying a hardening agent is connected to the swivel device 32, and the hardening agent is injected into the stirring shaft 4 through the hose and the swivel device 32 at the time of working, and the lower end of the stirring shaft 4 goes into the ground. Configured to be injected.

Outriggers 30 that support the vehicle body during work are attached to both sides of the frame 10 and both sides of the rear portion of the upper swing body 3.

In this embodiment, as shown in FIG.
The operation of the turning device 2 of the improved machine and the leader by the hydraulic cylinder 12 so that 24 is at the position of the mark (not shown)
By adjusting the front-back position of 19 and expanding / contracting the hydraulic cylinder 20 as shown in FIG.
Is tilted about the pin 16 as shown by an arrow i or j to adjust the tilt in the front-back direction, and as shown in FIG.
By extending one of the left and right hydraulic cylinders 31, 31 and contracting the other to tilt the leader 19 as shown by arrows k and l, the left and right tilts are adjusted to make the leader 19 vertical, and the outrigger 30 is tensioned. The stirring shaft 4 is activated by the operation of the hydraulic motor 26.
While pushing in, inject the curing agent.

Next, the revolving device 2 of the main body is operated to rotate the upper revolving structure 3 as indicated by m in FIG. 4, and the hydraulic cylinder 12 shown in FIG. 1 is extended to indicate the leader 19 by the arrow p. While moving forward, the turning device 14 on the movable support 11 is moved to the fourth position.
By stirring in the direction shown by arrow n in the figure, the stirring blade
The position of the reader 19 or the stirring shaft 4 is set so that the previous improvement point o and the present improvement point q indicated by the shaded area 24 are aligned in the direction of the line r, the outrigger 30 is tensioned, and the improving agent is injected.

Next, the revolving device 2 of the main body is operated to move the upper revolving structure to the fourth position.
By rotating the swivel device 14 on the movable support base 11 in the direction shown by the arrow t in FIG. 4 while rotating the hydraulic cylinder 12 as shown in FIG.
Is set in a shaded area to set the position of the reader 19 or the stirring shaft 4 so that the previous improvement point o and the previous improvement point q are aligned in the direction of the line r, and the outrigger 30 is attached.
Improving agent injection. By such an operation, it is possible to perform the improvement in a straight line in which the improvement points are arranged along the line r. The order of work may be q, o, r or vice versa.

When the work is performed with the upper revolving superstructure 3 in a direction substantially orthogonal to the lower traveling structure 1, after the improvement points q, o, r are improved, the improvement points q, o, r in the direction of the arrow D are shown. The improvement machine body is moved by a distance corresponding to the width, and the same work as described above is performed.

On the other hand, when the work is performed with the lower traveling structure 1 and the upper revolving structure 3 in substantially the same direction, the lower traveling structure 1 and the upper revolving structure 3 are moved backward by a distance corresponding to the improved circle diameter by substantially one stirring blade 24 as shown by the arrow E, and the same as the previous time. Then, the improvement points are arranged in the direction of the line r.

In either work mode, the hydraulic cylinder of the leader 19
By the forward / backward movement by 12 and the operation of the turning device 14 on the movable support 11, the stirring blades are brought close to the corners 7c of the boundaries 7a, 7b.
24 can be positioned to perform the modifier injection.

When traveling after finishing the work, as shown in v of FIG. 1, the leader undulating cylinder 20 is contracted so that the leader 19 is placed on the upper swing body 3.

The present invention can also be applied to the case where the lower traveling body is a wheel type or a float type.

(Effects of the Invention) According to claim 1, a frame is provided so as to project from a front portion of an upper revolving structure installed on the lower traveling structure via a revolving device, and a movable support table is moved back and forth on the frame by a driving device. Install,
A swivel device with a drive device is installed on the movable support base, and a plurality of stirring shafts are guided to a swivel body of the swivel device so as to be capable of tilting forward and backward and horizontally by a drive device for tilting the leader and a drive device for tilting left and right, respectively. Since a leader is attached, the positions of the three improvement points can be arranged in a straight line by the swing of the upper swing body, the swing of the leader, and the forward / backward movement of the leader. It can be performed easily and quickly without requiring.
Further, according to the present invention, since the plurality of stirring shafts are guided by the reader, the improvement agent can be injected efficiently, and the improvement point becomes long in the arrangement direction of the stirring axis. The agitation axis is 1 for horizontal and linear operation.
Compared with the case of the book, there is an effect that the operation can be performed efficiently at one time and the operation of the operator becomes easy.

Further, the ground can be improved evenly in the corner portion by the turning of the upper-part turning body, the turning of the leader, and the back-and-forth movement of the leader.

In addition, since it is possible to adjust the inclination angle of the front, rear, left, and right of the leader, the vertical control of the leader can be easily performed, and the ground can be improved evenly.

According to the second aspect, since the leader is formed in a square shape, it is possible to easily and inexpensively provide the leader by combining steel materials, as compared with the case where a cylindrical leader is used.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a ground improvement machine according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a horizontal sectional view of a reader, and FIG. 4 is this embodiment. 5 and 6 are plan views showing a working state by the conventional ground improvement machine.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Fujisawa 216-3 Miyanuma Benten-cho, Soka City, Saitama Prefecture, Tokyo Service Factory, Hitachi Construction Machinery Co., Ltd. (56) References: Sho 64-47839 Actual Development Sho 64-47840 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A frame is projectingly provided on a front portion of an upper revolving structure installed on a lower traveling structure via a revolving device, and a movable supporting base which is moved back and forth by a driving device is attached to the frame, and the movable supporting base. A turning device with a driving device is installed in the device, and a leader mounted on the body to be swung of the turning device so as to be capable of tilting forward and backward and left and right, a driving device for raising and lowering the leader, and a driving device for tilting left and right of the reader. While installing each independently,
A ground improvement machine having a plurality of stirring shafts attached so as to be vertically movable along the leader. 2. The ground improvement machine according to claim 1, wherein the leader is formed in a rectangular shape.