JPH1136767A - Soil-improved post body preparation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adopt driving structure, in which revolution is transmitted to an auger screw and a casing respectively from one driving section while independently rotating and stopping the casing apart from the auger screw in a soil- improved post body preparation machine. SOLUTION: One driving section with one or a pair of motors 15 is loaded on a holder 4 supported to a mast in a freely vertically movable manner and in an unturned manner. An internal output shaft 9, to which rotation is transmitted from the motors 15, and a cylindrical external output shaft 10 surrounding the internal output shaft 9 are projected to lower sections respectively, and the upper end section of one auger screw 11 in a casing 12 having an opening in an upper-end section side wall and the auger screw 11 rotatably inserted into the casing 12 is connected to the internal output shaft 9, and the upper end section of the other casing 12 is Joined detachably with the external output shaft 10 through a clutch device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement column forming machine for forming a column in a ground with a ground improvement material such as sand or lime.

[0002]

2. Description of the Related Art Generally, in order to construct a ground improvement column, a casing having an opening in a side wall at an upper end and a casing inserted into a casing including a motor and a reduction gear supported on a mast so as to be movable up and down. Using a ground improvement column building machine to which auger screws are connected respectively, in the formation, the casing and the auger screw are rotated in opposite directions, and the casing is excavated by the auger screw while the casing is pressed into the ground. Then, the excavated earth and sand is discharged upward, and when the casing is pressed into the predetermined depth, the rotation of the casing is stopped, and the ground improvement material (eg, sand) is introduced into the casing through the opening and the auger screw is rotated in the reverse direction. Thus, a method of back-filling the sand into the casing is performed.

[0003] In this case, the rotation of the casing and the auger screw are different from each other. Therefore, in the conventional ground improvement column building machine, two driving units independent of each other are arranged in the mast in an up-down arrangement. Support it up and down freely,
A drive structure in which an auger screw is connected to an upper drive unit and a casing is connected to a lower drive unit is used.

However, in the conventional machine having two independent driving units as described above, the driving units are vertically long, and accordingly, the mast needs to be lengthened. .

[0005]

The invention of claim 1 of the present application employs a drive structure for transmitting rotation from one drive unit to a casing and an auger screw, and independently rotates and stops the casing. The challenge is to be able to

As a means for solving the problem, the invention of claim 1 of the present application mounts one drive unit having one or one set of motors on a holder supported on a mast so as to be able to move up and down and not to turn. Among the casing and the auger screw that are rotatably inserted into the casing and the casing that has an opening in the upper end side wall and protrudes the inner output shaft transmitted from the motor and the cylindrical outer output shaft that surrounds it downward, respectively. A ground improvement column forming machine is proposed in which an upper end of one auger screw is connected to the inner output shaft, and an upper end of the other casing is connected to the outer output shaft via a clutch device so as to be freely connected to and separated from the outer output shaft.

A third object of the present invention is to prevent the casing from rotating together when the auger screw is rotated while the rotation of the casing is stopped and the ground improvement material is charged into the casing. As means for achieving the object, the invention according to claim 3 of the present application provides a counter-rotation prevention device at the upper end of the casing, and the counter-rotation prevention device includes a detent stopper member at the upper end of the casing, Each of the holders is provided with a locking member to be locked with the stopper member to prevent rotation of the stopper member, and the stopper member and the locking member are locked when the clutch device is disengaged to form the casing. Put it in a rotation impossible,
A ground improvement column building machine having a clutch device according to claim 2, wherein the clutch device is detached when the clutch device is connected and the casing is rotatable. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0008]

1 and 2, a mast (2) is held upright at the front of a base machine (1).
A guide rail (3), which is laid on the (3), a holder (4) mounted with a drive unit (5) on a slide bracket (6)
… Through the…
It is suspended by a wire (8) suspended from a top sheave (7) so as to be able to move up and down, and an inner output shaft (9) and a cylindrical outer output shaft (10) surrounding the inner output shaft (9) protrude downward from the driving portion (5). The upper end of an auger screw (11) having a drilling head (13) at the lower end is connected to the inner output shaft (9), and the outer output shaft (10) is rotatable and slidable on the auger screw (11). The upper end of the freely fitted cylindrical casing (12) is connected to the clutch device (14).
Are connected so as to be able to freely contact and separate via.

The driving section (5) is provided with the holder (4).
A pair of motors (15) installed on both right and left sides of the upper part,
(15) and the reduction gears (1
6) and (16), wherein the inner output shaft (9) is rotatably supported at an intermediate position between the inner output shaft (9) and the lower output shaft (10) via bearings, and rotation is transmitted to these output shafts. First, the deceleration rotation of the two reduction gears (16) and (16) is applied to the gears (17) and (17) fixed to the drive shafts of the two reduction gears, respectively, and to the inner output shaft (9) engaged with them. It is transmitted to the inner output shaft (9) via the fixed gear (18), and then from the gear (19) fixed to the inner output shaft (9), the idle gears (20), (2)
0), and transmitted to the outer output shaft (10) via the internal gear (21) fixed to the inner peripheral surface at the upper end of the outer output shaft (10).

The clutch device (14) is as follows. 2 and 3, hydraulic cylinders (22), (2) for lifting and lowering are provided on the lower left and right sides of the drive unit holder (4).
2) is connected and suspended, and the support rings (2) are attached to the lower ends of the piston rods (23) and (23) of both cylinders.
4), while suspending an auxiliary plate (25) fixed to the lowermost rear surface of the drive unit holder (4), and suspending the auxiliary plate (25) in a vertical cross-section. A slide piece (27) having an L-shaped cross section protruding from the back surface of the support ring (24) on L-shaped rails (26) and (26);
(27) is slidably engaged with the support ring (2).
4) is supported so that it cannot turn during the up-and-down stroke.
4) A rotary cylinder (28) is mounted on a bearing (29) (FIG. 2).
(See (a)) and rotatably supported through the rotary cylinder (2).
8) At the lower end of the opening, an opening (31) for discharging and soil improvement material,
An auxiliary cylinder (30) having (31), a casing (12) is sequentially and concentrically connected to the lower end thereof. (32),
(32) is a slide bracket fixed to the lower part of the auxiliary plate (25), and the guide rails (3), (3) of the mast.
Is engaged.

At the lower end of the outer output shaft (10), a cylindrical female spline shaft (33) having eight spline grooves on its inner peripheral surface is connected concentrically to the lower end of the outer output shaft (10). At the upper end of 28), a cylindrical male spline shaft (34) having four spline ridges on the outer peripheral surface is concentrically connected to the upper end of the hydraulic cylinders (22) and (22) and supported by reduction driving. When the ring (24) and the casing (12) are raised, the male spline shaft (34) is inserted into the female spline shaft (33), and the spline ridges are splined as shown in FIG. And the casing (12) is connected to the outer output shaft (10) so as to be able to transmit rotation, and the support ring (24) and the casing (12) are driven by extension driving of the hydraulic cylinders (22) and (22). When you drop it, Spline ridges is disengaged from engagement with the spline grooves outer output shaft casing (12) (1
Disconnect from 0).

The casing (12) is connected to the outer output shaft (1).
As means for preventing co-rotation of the casing (12) when the auger screw (11) is rotated in a state where the auger screw (11) is separated from the rotary cylinder (0), four pieces as shown in FIGS. The plate-like stoppers (35) are arranged at 90 ° intervals from each other with the plate surfaces oriented vertically.
The auxiliary plate (25) is fixed in a radiating state slightly outwardly, and a locking groove (36) to be locked with the stopper (35) is provided on the front surface of the auxiliary plate (25). When the male spline shaft (34) is lowered from the clutch connection state shown in FIG. 2, the stopper (35) engages with the locking groove (36) before the spline ridge separates from the spline groove. When the male spline shaft (34) is raised from the clutch disengaged state in FIG. 3, the stopper (35) is disengaged from the locking groove (36) after the spline ridge is sufficiently engaged with the spline groove. is there.

When the casing (12) is raised and the clutch device (14) is in the connected state,
As shown in FIG. 1, the excavating head (13) of the auger screw (11) projects downward from the lower end of the casing (12) to enable pre-excavation on the casing (12), and lowers the casing (12). When the clutch device (14) is in the disengaged state, the excavating head (13) is almost retracted into the casing (12).

The operation of the above example will be described next together with a usage example. 1 and 2 with the clutch device (14) connected, the motors (15) and (15) are started to rotate the auger screw (11) clockwise and the casing (12) counterclockwise to go underground. When excavation starts, as shown in FIG. 4A, the excavation head (13) conveys the excavated earth and sand upward in the casing (12) while excavating below the lower end of the casing (12). It discharges out of a casing from opening (31), (31). The casing (12) easily excavates into the above-mentioned excavation hole.

After excavating to a predetermined depth, each rotation of the auger screw (11) and the casing (12) is stopped,
Then, the clutch device (14) is disengaged by the extension driving of the lifting hydraulic cylinders (22), (22), and the casing (12) is pushed down, whereby the casing extends to the bottom of the hole as shown in FIG. (12) will be sufficient.

Next, the leading end of the opening of the ground improvement material supply hose (H) is connected to the opening (31) of the casing as shown in FIG.
In this example, sand is supplied into the casing (12) from the hose (H), and the auger screw (11) is rotated in the reverse direction so that the supplied sand is supplied into the casing (12). It is fed backward and filled into the bottom of the casing.

Then, while continuing the supply of sand and the reverse rotation of the auger screw (11), the auger screw (11) and the casing (12) are gradually wound by winding the wire (8) as shown in FIG. To the ground.
The casing (1) in the process of FIGS. 5 (c) and (d)
2) Since the casing (12) is stopped during the supply of the sand into the inside, the hose (H) can be held at the supply position and supplied reliably. Thus, a sand pile (P) in which the hole is filled with sand is obtained as shown in FIG.

In the reverse rotation of the auger screw (11) shown in FIGS. 4 (c) and 5 (d), the casing (1)
2) may rotate together with the auger screw (11) using the internal sand as a rotation transmission medium. When the casing (12) is lowered for the clutch disengagement, the stopper (35) is engaged with the locking groove (36). To prevent the casing (12) from rotating, so that the sand supply operation from the opening (31) can be continued without any trouble.

[0019]

According to the first aspect of the present invention, there is provided a drive structure for transmitting rotation from one drive unit to the auger screw and the casing, respectively, and the casing is rotated independently of the auger screw by the contact and separation of the clutch device. Thus, various operations such as excavation for rotating the casing together with the auger screw and supply of a ground improvement material for rotating the auger screw but stopping the casing can be effectively performed.

According to the invention of claim 3 of the present application, in the operation of rotating the auger screw in the reverse direction while supplying the ground improvement material into the casing, the co-rotation preventing device prevents the casing from rotating together with the auger screw. Thus, the operation of supplying the ground improvement material into the casing can be continued without any trouble.

[Brief description of the drawings]

FIG. 1 is a partially omitted side view of a ground improvement column forming machine.

FIG. 2 (a) is an enlarged partial longitudinal front view of a drive unit and a clutch device. (B) It is sectional drawing on the AA line of (a) figure.

FIG. 3A is a side view of a drive unit and a clutch device. It is a BB sectional drawing of (b) and (a) figure.

FIG. 4 is a schematic cross-sectional view of an excavation step in (a) sand pile formation. (B) It is an approximate line sectional view of the above-mentioned excavation completion state. (C) It is an approximate line sectional view of a sand supply process same as the above.

FIG. 5 is a schematic cross-sectional view of a step of drawing out the auger screw and the casing in the same. (E) It is an approximate line sectional view of the above-mentioned sand pile completion state.

[Explanation of symbols]

 2 Mast 4 Holder 9 Inner output shaft 10 Outer output shaft 11 Auger screw 12 Casing 14 Clutch device 15 Motor 22 Hydraulic cylinder for lifting / lowering 31 Opening for discharging and ground improvement material 35 Stopper 36 Locking groove

Claims (3)

[Claims] 1. A drive unit having one or a set of motors is mounted on a holder supported on a mast so as to be able to move up and down and not to rotate, and an inner output shaft to which rotation is transmitted from the motor and surrounding the inner output shaft. The upper end of one auger screw of the casing having an opening in the upper end side wall and the auger screw rotatably inserted into the casing is connected to the inner output shaft. Then, the upper end of the other casing is connected to the outer output shaft via a clutch device so as to be freely contactable and detachable,
Ground improvement column building machine. 2. The clutch device according to claim 1, wherein the upper end portion of the casing and the outer output shaft are formed in a cylindrical body that is removably fitted to each other, and extends in one of the fitting surfaces of the two cylindrical bodies in the axial direction. One or more keys are provided on the other side, and one or more key grooves are provided on the other side so as to be detachable therefrom, and the casing and the outer output shaft are relatively axially moved to fit and disengage the casing and the outer output shaft. The ground improvement column building machine according to claim 1, further comprising a driving means for causing the ground to be improved. 3. An anti-rotation device is provided at an upper end of the casing, and the anti-rotation device includes a detent stopper member at an upper end of the casing.
The holder of the drive unit is provided with a locking member that locks with the stopper member to prevent rotation of the stopper member, and the stopper member and the locking member lock when the clutch device is disengaged. The ground improvement column building machine according to claim 2, wherein the casing is in a state where the casing is unrotatable and the casing is rotatable by disconnecting when the clutch device is connected.