KR0134572B1 - Apparatus for increasing bearing capacity of soft soil - Google Patents

Abstract

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Description

Ground Stabilization Device

1 is an overall side view of the ground stabilizer according to the present invention.

2 is a vertical cross-sectional view of the ground stabilizer.

3 is an enlarged cross-sectional view of a main part of the ground stabilizer.

4 and 5 are cross-sectional views taken along the line I-I of FIG.

4 shows the bottom and side discharge valves located in the open position.

5 shows the bottom and side discharge valves positioned in the closed position.

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

* Description of the symbols for the main parts of the drawings *

A: ground stabilization device, B: powder reloading device,

C: ground modifier injection device, 1: gas,

2: Hardener supply device 4: Rotating shaft,

5: hydraulic motor, 6: cutting edge,

7: stirring blade, 9: outer shaft,

10: inner shaft, 11: double reverse gear mechanism,

27: bottom discharge valve, 32: side discharge valve

The present invention relates to a ground stabilization device. Conventionally, in order to improve a very soft ground, an upright or vertical hole is formed in the ground using an excavation apparatus mounted on a body, and the soil excavated by the excavation apparatus is stirred to harden and improve the ground. Was mixed.

In the above ground improvement work, the ground stirring and mixing work is carried out by auger (agitating ber) or the like fixedly mounted on the auger (auger) of the drilling device or the rotary shaft.

However, in such a structure, since all the stirring rods rotate with the rotating shaft, the soil excavated by the stirring structure also rotates with the rotating shaft in the same direction so that the soil cannot be sufficiently stirred.

Particularly, in the work to improve the ground by using a powder hardener on the ground composed of extremely soft soil such as clay, which contains a large amount of water, the soil excavated by the stirring structure adheres to the stir bar and is spherical soil. The formation of a soak ball makes the soil agitating and mixing impossible at all.

Accordingly, an object of the present invention is to provide a ground stabilization device which can solve the drawbacks of the above-described conventional stirring structure and which can perform the stirring and mixing operation very efficiently even with extremely soft ground.

Another object of the present invention is to provide a ground stabilization device that can be manufactured at low cost, and another object of the present invention is ground stabilization that can be loaded into the soil near the ground hardener as well as a powder material such as sand. To provide a device.

In summary, the present invention discloses a ground stabilization device comprising a plurality of concentric rotary shafts alternately or sequentially rotating in opposite directions, and a plurality of stirring blades fixedly mounted on the rotary shafts respectively and rotating in opposite directions corresponding to the rotation of the rotary shafts. do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the ground stabilization device A includes a movable gas 1 and a transition agent supply device 2. As shown in FIG.

The base 1 supports the axis of rotation 4 vertically by a leader 3.

In addition, a cutting blade 6 fixedly attached to the tip of the rotary shaft 4 and a stirring blade fixed to the rotary shaft 4 by a hydraulic motor 5 installed between the reader 3 and the rotary shaft 4 ( 7) Rotate the rotary shaft 4 along the reader 3 to drill a vertical hole H in the ground G.

The rotary shaft 4 has a redundant or double shaft structure, ie a tubular inner shaft 10 inserted into the hollow tubular outer side 9 and the outer shaft 9, as shown in FIG. 2.

The outer shaft 9 and the inner shaft 10 are rotated in opposite directions by a double reverse gear mechanism 11 provided between the upper end of the rotary shaft 4 and the hydraulic motor 5.

The tubular state shaft 10 extends further downward from the lower end of the outer shaft 9, and the red flesh blade 0 is fixedly attached to the tip of the inner shaft 10.

The stirring blade 7 is arranged on the cutting blade 6.

The stirring blade 7 is comprised by the stirring blades 7a, 7b, 7c of large, medium, and small.

The large and intermediate stirring blades 7a and 7b have a trapezoidal shape, and the small stirring blade 7c has a rectangular shape.

These stirring blades 7a, 7b, 7c are radially mounted on the rotary shaft 4.

The small stirring blade 7c is fixedly mounted on the rotatable cylindrical sleeve 37, and the cylindrical sleeve has an upper end rotatably mounted on the lower end of the outer side 9.

As shown in FIG. 2 and FIG. 6, the rotational angle of the cylindrical sleeve about the outer axis 9 is movable in the circumferential direction in the pair of holes 37b and 37b extending laterally on the inner axis 10. It is limited by a pair of stoppers (37a) (37b) arranged so as to.

As shown in FIG. 2, the intermediate stirring blade 7b surrounds the outer periphery of the small stirring blade 7c.

The intermediate stirring blade 7b has an upper end rotatably mounted on the outer circumference of the outer shaft 9, and the lower end of the intermediate stirring blade is fixedly mounted on the outer circumference of the inner shaft 10.

The large stirring blade 7a surrounds the outer periphery of the intermediate stirring blade 7b, and the large stirring blade 7a is rotatably mounted on the outer periphery of the upper and inner shafts 10 fixedly mounted on the outer periphery of the outer shaft 9. Holds the bottom.

Therefore, the intermediate stirring blade 7b rotates in the opposite direction with respect to the large and small stirring blades 7a and 7c.

In the case of ground improvement work on the ground composed of extremely soft soil such as clay, which contains a large amount of water, the hardener in powder form is preferred, while the soil excavated by the stirring blades 7a, 7b, and 7c Since the shear force is required to be greater than the soil around the vertical hole, the soil excavated by the conventional stirring structure is attached to the stirring rod to form a spherical soil mass, which makes it impossible to agitate and mix the soil at all.

In the present invention, since the stirring blades 7a, 7b, 7c rotate in opposite directions to each other, the formation of spherical soil masses is prevented from being exchanged, and the stirring and mixing of the soil are actively performed.

As shown in FIG. 2, referring to the powder reloading device B for supplying the powder material into the rotating shaft 4, the powder reloading device B is shown in FIG. 2 and FIG. Is installed.

Reference numeral 35 denotes a specific device for measuring the powder material supplied to the rotating shaft 4.

The hopper 14 is mounted on the upper end of the outer shaft 9 below the measuring device 35, and the outer shaft 9 is in communication with the inside of the hopper 14.

A screw 15 made up of a spirally elongated blade is mounted on the outer circumferential surface of the inner shaft 10 at a position disposed below the hopper 14.

The lower end of the screw 15 is surrounded by a conical inner transfer cylinder 16 having an upper end fixedly connected to the inner surface of the outer shaft 10.

The lower end of the inner transfer cylinder 16 prevents the powder material that falls and accumulates on the powder re-discharge valve 36 installed below the inner transfer cylinder 16 and accumulates on the upper end of the open end of the inner transfer cylinder 16. It is cut obliquely to make.

The powder re-discharge valve 36 has a valve plate 36a located in the rotating cylindrical sleeve 37.

A plurality of valve openings 36b and 36c are formed in the valve plate 36a and the cylindrical sleeve 37, respectively.

Further, under the valve plate 36a, a cylindrical valve box 36d is fixedly mounted on the outer surface of the inner shaft 10.

The valve openings 36e and 36f open and close the valve openings 35b, 36c, 36e and 36f which are switched by switching clockwise rotation or counterclockwise rotation of the outer shaft 9 and the inner shaft 10. It is formed in the upper wall and the peripheral wall of the cylindrical valve box 36d so that closing is possible.

By the above switching operation, the powder refilling device B can select the discharge of the powder material or the discharge stop of the powder material near the small stirring blade 7c.

Under the powder re-discharge valve 36, not only the side discharge valve 32 of the ground improvement agent injection apparatus c but also the bottom discharge valve 27 are provided.

The side discharge valve 32 has a cylindrical structure in which the base has a diameter equal to the diameter of the tubular outer shaft 9.

The side discharge valve 32 has an upper open end slidably engaged with the lower end of the outer shaft 9 and a lower end to which the outer surface of the inner shaft 10 is loosely received.

A side discharge valve opening portion 32b is formed on the side wall of the side discharge valve 32, and is circumferentially mounted and movable along the inner circumferential surface of the side wall of the valve discharge portion 32b. It is opened or closed by the shutter 32a of the shape.

4 and 5, reference numerals 32c and 32c denote stoppers for controlling the rotational range of the shutter 32a about the inner shaft 10 caused by the resistance of the soil acting on the side cabbage 32. Indicates.

That is, as the shutter 32a rotates, the stoppers 32c and 32c cause the side discharge valve opening 32b to be in the open position or the closed position.

In the open position, the soil hardener passes through the annular space defined between the tubular outer shaft 9 and the tubular inner shaft 10 and then enters into the excavated soil passing through the side discharge valve opening 32b.

A bottom discharge valve 27 having a cylindrical wall and a circular bottom plate is rotatably installed inside the inner shaft 10 at the same height as the lower end position of the outer shaft 9.

Below the bottom discharge valve 27, a circular disk 12 is fixedly mounted on the inner circumference of the inner shaft 10 to support the bottom discharge valve 27.

As shown in FIGS. 4 and 6, a fan opening 27a fixed in a fan shape and a plurality of rotating valve openings 27b are provided on the bottom plate of the circular disk 12 and the bottom discharge valve 27. Formed.

The bottom discharge valve 27 and the side discharge valve 32 are interlocked by a projection 27c protruding from the cylindrical side wall of the bottom discharge valve 27 and a strut mounted on the inner plate of the side discharge valve 32. ) Are integrally rotated together.

The soil hardener supplied into the inner side 10 is vertical through the bottom discharge valve opening portion 27e provided near the cutting edge 6 at the lower end of the inner shaft 10 when the valve opening portions 27a, 27b of both sides are in line. It is charged into the hole H.

The bottom discharge valve opening 27e is formed on each side wall of the bottom discharge valve 27 and the inner shaft 10 so as to be opened and closed in the same manner as the side discharge valve 32 described above.

In FIG. 2, reference numeral 40 denotes a discharge opening for a slurry-type hardener such as milky white cement, and the discharge opening 40 denotes a powder re-discharge valve 36 and It communicates with the bottom discharge valve 27.

Therefore, due to the resistance of the soil and the soil hardener, when rotated in one direction of the inner shaft 10, the bottom discharge valve 27 is closed and the side discharge valve 32 is stirred near the lower end of the small stirring blade 7c. When the inner shaft 10 is rotated in the opposite direction, the side discharge valve 32 is closed and the bottom discharge valve 27 is opened into the stirring soil near the cutting edge 6 when the inner shaft 10 is rotated in the opposite direction. It is open for charging.

As described above, by switching the rotational direction of the tubular inner shaft 10, the supply of the powder material can be started or stopped, so that the loading position of the soil hardener can be changed to the upper position or the lower position.

Therefore, in order to stabilize the soft ground, first load a powder material having good fluidity such as sand into the excavated soil, and then load a soil hardener such as cement into the excavated soil while alternating the soil loading position to the upper position or the lower position. Let's do it.

The soil excavated in this way, the powdered material and the hardener are vigorously stirred, uniformly and sufficiently mixed so that the stabilized ground can have sufficient strength throughout. Therefore, the efficiency and reliability of the ground stabilization work are greatly improved.

Claims (1)

A plurality of concentric rotating shafts 4, which are alternately or sequentially rotated in opposite directions, having an internal rotary shaft 10 and an external rotary shaft 9 having a soil hardener supply passage therein, fixed on the respective rotary shafts The rotating shaft rotates in the opposite direction as the rotating shaft rotates, and a plurality of stirring blades (7a) (7b) (7c), the size of which increases in proportion to the radial direction, increases concentrically, the plurality of rotating shafts It is disposed adjacent to the gas (1) installed on the ground surface, the above-described gas (1), the soil hardener supply device (2) for supplying the soil hardener to the rotating shaft, the plurality of rotating shafts opposite to each other A means 11 for rotating in the direction, which is located under the stirring blade and is rotatable together with the innermost rotating shaft of the plurality of rotating shafts. It is attached to the cutting edge 6 connected to the lower end of the rotary shaft in the innermost of the front shaft, the lower end of the rotary shaft, wherein the soil hardener is in the vicinity of the stirring blade (7a) (7b) (7c) from the rotary shaft Soil comprising a valve means having a valve element (27) (32) to start or stop the action to be discharged into the soil, powder supply device (B) and a powder supply passage formed in the outer rotary shaft Stabilizer.

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