JP2919209B2 - Soft ground improvement method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for improving the hardening of a soft ground by injecting and stirring a solidified material into the soft ground.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5 and FIG. 6, a method of building up a solidified material on a soft ground and squeezing the solidified material into the ground with stirring blades provided on a rotating hollow rod is used. Used.

[0003] In the above method, due to the centrifugal force, the solidified material is little mixed into the center portion of the stirring blade and the mixing depth is not only shallow, but also the solidification degree is large near the surface and it is difficult to solidify to the deep part. There is a problem that the ground surface bulges due to the concentration in the vicinity (see FIG. 6), and a leveling operation is required.

[0004]

DISCLOSURE OF THE INVENTION The present invention aims at uniformly mixing a solidified material from a deep portion to the ground surface into soft ground to form a uniform hardened layer from the ground surface to the deep portion and to prevent the ground surface from rising. Aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a crawler arm which is detachably provided at the tip of an arm thereof.
A horizontal axis is provided between the two forked legs at the lower end of the fixed frame,
The agitating blade is rotated around the horizontal axis, moved up and down in the soft ground, and solidified material is supplied from the opening provided at the upper part of the bifurcated leg.
And mixed into the ground by the rotation of the stirring blade, and when the stirring blade rises, the solidified material is evenly distributed within the rotation range of the stirring blade.
A horizontal axis is provided between the two forked lower ends of a fixed frame detachably provided at the tip of the arm of the crawler arm, the method comprising a plurality of agitators rotating about the horizontal axis. A soft ground improvement device having a blade provided with a lower end opening of a solidified material supply pipe piped to the frame opened to the upper part of the bifurcated leg and provided toward the rotation range of the stirring blade. The soft ground improvement device arm according to the second aspect of the present invention, wherein the stirring blade is rotated by a motor, is a long arm, a fixed frame is detachably provided at a tip of the arm, and the frame is attached to a lower end portion of the vertical rod by a two-arm. The soft ground improvement device according to the second or third aspect of the invention is provided with a crotch leg.

[0006]

According to the present invention, a fixed frame 8 is provided at the tip of the arm 7 of the crawler 6, and the agitating blade 2 is rotated about the horizontal axis 1 provided at the lower fork leg 8 ", 8". It descends into the ground 3 at a certain depth. Thereafter, the solidifying material 4 is supplied from lower end openings 10 ′, 10 ′ of the solidifying material supply pipe 10 provided above the forked legs 8 ″, 8 ″. , Fixed frame 8
And the above-described pouring and mixing are performed up to the ground surface 12, and the inside of the rotation region 5 can be hardened and improved by mixing the solidified material 4.

The solidified material 4 injected into the rotation region 5 is rotated around the horizontal axis 1 of the stirring blade 2 and slides up and down to rotate the rotation region 5.
The unevenness of mixing due to the action of centrifugal force is leveled by the above-mentioned sliding in the front-rear, left-right and up-down directions, and the solidified material 4 subjected to the centrifugal force is discharged to the outside of the rotation zone 5 and
No two will rise.

[0008]

[Example] Crawler 6 is placed on embankment 13 such as a river,
A long arm 7 is provided at the tip of a long boom 14 provided on the crawler 6, and a pin 15
The upper end of the fixed frame 8 is detachably pivotally attached to the mounting bracket 16 pivotally supported by the main pin 17, and the middle of the arm 7 and the operating pin 18 at the upper end of the frame 8 are connected by a hydraulic cylinder 19. Thus, the hanging angle of the fixed frame 8 can be adjusted, and the frame 8 can be fixed in the vertical direction.

The fixed frame 8 has a double-legged bifurcated leg 8 ", 8" formed at the lower end of a vertical rod 8 '. The rotating horizontal shaft 1 is pivotally mounted on a bearing 9 at the lower end of one leg 8 ". A rotating disk 19 is provided at the inner end of the horizontal shaft 1, and a horizontal rotating cylinder 20 sharing the center line c with the horizontal shaft 1 is connected to the disk 19, and fitted into the cylinder 20. One end of the fixed cylinder 21 to be fitted is fixed to the lower end of the other leg 8 ″ by welding.

The hydraulic motor 1 is provided inside the fixed cylinder 21.
1 is provided, the center line c of the output shaft 11 ′ of the motor 11 is matched with the center line c of the horizontal shaft 1, and the output shaft 11 ′ is connected to the rotary cylinder 20 by spokes or disks 22. The rotating cylinder 20 can rotate around the center line c by the output shaft 11 '.

The rotating cylinder 20 is provided with four pairs of stirring arms 2 'and 2' having an opening angle of 90 degrees.
The stirring blade 2 is formed by bridging the horizontal rod 2 ″ for stirring at the tip of 2 ′, and the horizontal rod 2 ″ is provided with a plurality of excavating blades 23, respectively. Instead of the arms 2 ′ and 2 ′, a stirring blade 2 can be formed by providing a horizontal, vertical or oblique digging blade or stirring plate (not shown) at the tips of the plurality of arms.

A solidification material supply pipe 10 is provided along the vertical rod 8 ', and the lower end openings 10', 10 'are opened toward the rotation area 5 of the stirring blade 2, that is, into the imaginary line in FIG. Dry powder, cement milk, slurry, or the like is used as the solidifying material 4. The supply pipe 10 is supported by the long arm 7 and the long boom 14 and connected to a pressure pump 24. The parts 10 ′ and 10 ′ are injected and mixed into the stirring ground.

Such injection is carried out when the stirring blade 2 is rotated down into the ground 3 to stir the ground 3 for a time and then when the ground 3 is lifted up. This operation is performed while the vehicle reaches the ground surface 12, and the operation is performed by opening the on-off valve of the supply pipe 10. However, it may be performed at the time of descent depending on the properties of the ground 3, such as hardness and softness, viscosity, and the like. Further, the ascending speed at the time of ascent can be adjusted.

Reference numeral 26 in the figure denotes a hydraulic oil pipe for the hydraulic motor 11, reference numeral 27 denotes a hydraulic cylinder for elevating and lowering the long arm,
Reference numeral 8 denotes a long boom lifting hydraulic cylinder.

[0015]

As described above, according to the present invention, the hardened ground 3 can be hardened evenly from the deep part of the soft ground 3 to the ground 12 and not only the thickness of the improved layer can be made large but also the rise of the ground 12 is small. There is an effect that the ground leveling operation can be simplified. Further, according to the present invention, the rotation range 5 of the stirring blade 2 is made to reach a certain depth from the ground surface 12 by the fixed frame 8 by the above-mentioned device, and the solidified material 4 is injected and mixed into the stirred ground 3 from the deepest part by the solidified material supply pipe 10. Not only can the ground 3 be hardened and improved evenly from the deep portion to the ground surface, but also the solidified material 4 can be uniformly mixed in the rotation region 5 by the upward sliding of the stirring blade 2.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a soft ground improvement method of the present invention.

FIG. 2 is a partial front view of FIG. 1 as viewed from the left.

FIG. 3 is a side view of the embodiment when FIG. 2 is viewed from the left.

4 (a), (b), (c), (d), and (e) are side views of a soft ground improvement state.

5 (a) and (b) are a front view and a plan view of a conventional stirring blade and a hollow rod.

FIG. 6 is a longitudinal sectional view of a ground improvement state using a conventional stirring blade.

FIG. 7 is a plan view of a conventional improved continuous wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal axis 2 Stirrer blade 3 Soft ground 4 Solidification material 5 Rotation area 6 Crawler 7 Arm 8 Fixed frame 8 'Hanging rod 8 "Bifurcated leg 10 Solidification material supply pipe 10' Lower end opening 11 Hydraulic motor

Claims (4)

(57) [Claims] 1. A crawler arm which is detachably attached to a tip of an arm of the crawler.
A horizontal axis is provided between the two legs of the fixed frame at the lower end.
Then , the stirring blade is rotated around the horizontal axis, moved up and down into the soft ground, and the solidified material is supplied from the opening provided at the upper part of the bifurcated leg, and mixed into the ground by the rotation of the stirring blade.
And, soft ground improvement method characterized by uniformly injected into the rotation region of the stirring blade of the solidifying material during elevation of the stirring blade. 2. A horizontal axis is provided between two forked legs of a lower end of a fixed frame detachably provided at a tip of an arm of a crawler, and a plurality of stirring blades rotating around the horizontal axis are provided.
Top bottom opening of solidifying material supply pipe which is the piping to the frame
The soft ground improvement device which is provided at the upper part of the forked leg and is provided toward the rotation range of the stirring blade. 3. The soft ground improvement device according to claim 2, wherein the stirring blade is rotated by a hydraulic motor. 4. The arm according to claim 1, wherein the arm is a long arm, a fixed frame is detachably provided at an end of the arm, and the frame has a bifurcated leg at a lower end of the vertical rod.
The soft ground improvement device according to (2) or (3).