JP2001311139A - Ground improvement agitator provided with corotation prevention blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means capable of securely preventing corotation and preparing high quality improved soil when constructing an improved columnar body to enhance the bearing force of the ground. SOLUTION: A ground improvement agitator 10 provided with a corotation prevention blade has a hollow rotary shaft 14 in which a delivery opening 14a is formed at the tip, a drilling head 11 having an excavating tip 110 at the front end and preventing the delivery opening 14a from being clogged at the tip of the rotary shaft 14, a pair of mutually opposite excavating agitating blades 12H, 12L so as to have an inclination slanting at a certain angle with respect to the horizontal face at every specified interval on the roraty shaft, a hollow shaft 15 in which the rotary shaft 14 of the more basal end side than the excavating agitating blade 12H is internally inserted, and a corotation prevention blade 101 provided at the tip of the hollow shaft 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement stirrer for constructing an improved column for increasing the ground support force.

[0002]

2. Description of the Related Art Generally, when a house or the like is constructed on soft ground, an improved pillar 6 as shown in FIG.
The ground improvement method of improving the bearing capacity of the ground by constructing a plurality of grounds is constructed. Further, in order to improve the supporting force per one of the improved pillars 6, as shown in FIG. 5 (b), an improved pillared body 7 having a plurality of knots 8 is formed on the improved pillared body. There is also a ground improvement method to be established. Since the improved columnar member 7 has the node portion 8 in which the outer diameter of the improved columnar member is increased, the frictional force with the ground increases as compared with the ordinary improved columnar member 6. For this reason, the number of the improved pillars to be constructed can be reduced or the length of the improved pillars can be shortened, and the ground improvement method can be simplified.

The improved column 6 or the knotted improved column 7 is
It is constructed using an apparatus as shown in FIG. That is,
A ground improvement stirrer 1 having an excavation stirrer for excavating and stirring the ground is provided on a column 3 fixed by a construction machine 2 so as to be able to move up and down and rotate freely, and a mixer 4 kneads water and a solidifying agent. A solidifying agent slurry is produced, and the solidifying agent slurry is pumped to the ground improvement stirrer 1 by a pump 5, and the ground improvement stirrer 1 penetrates into the ground while rotating the excavation stirring blade. Then, after digging the ground on which the improved pillar 6 or 7 is to be constructed, the drilling and stirring blades are rotated while discharging the solidifying agent slurry, and the solidifying agent slurry is mixed with earth and sand. The soil is prepared, the ground improvement stirrer 1 is pulled up, and the improved soil is solidified to construct the improved column 6 or the improved knotted column 7. In addition, when adding the improved column 7 with a node, the ground improvement stirrer provided with the expansion wing whose rotation outer diameter expands or contracts according to the rotation direction of the ground improvement stirrer is used.

The above-mentioned soil improvement method depends on the solidification reaction of the improved soil obtained by mixing earth and sand with a solidifying agent slurry.
It is an important requirement that the earth and sand and the solidifying agent slurry be mixed well, but when the earth and sand is clayey, etc., when mixing and stirring the earth and sand and the solidifying agent slurry using the ground improvement stirrer 1 The phenomenon that the unimproved soil turns into a dumpling and rotates together with the excavating and stirring blades of the ground improvement stirrer 1, a so-called co-rotational phenomenon, occurs, and the unimproved soil remains as a lump or solidifies only on the outside. Could be. In order to prevent this, a ground improvement stirrer equipped with anti-corotating blades has been devised.

Hereinafter, the ground improvement stirrer 9 provided with the co-rotation prevention blade will be described. As shown in FIG. 7, the ground improvement stirrer 9 has a hollow rotary shaft 10 having a discharge port 10 a formed at the distal end thereof, and a drilling tip 110 at the distal end thereof. And a pair of drilling heads 11 provided so as not to block the discharge ports 10a, and a pair of counterparts provided at regular intervals on the rotating shaft 10 so as to be inclined at a constant angle with respect to a horizontal plane. Excavating stirring blade 12H,
12M, 12L, excavating and stirring blade 12M and excavating and stirring blade 12
L and the anti-corotating wing 13 provided on the rotating shaft 10. The excavating stirring blades 12H, 12M,
12L are provided so as to protrude in the horizontal direction, respectively, and the direction in which the excavating and stirring blades 12H and 12L protrude and the direction in which the excavating and stirring blades 12M protrude have a phase difference of 90 degrees about the rotation axis 10. Has become. A drilling tip 110 is provided on one edge side of the drilling stirring blade 12L.

The anti-corotating wing 13 is formed by a pair of rectangular flat plates from the side of a tubular body 31 externally fitted so as to be inscribed in the rotating shaft 10, the surfaces of which are flush with the axis of the rotating shaft 10. The tubular body 31 is sandwiched by a stopper 32 fixed to the rotating shaft 10 so as to protrude in the horizontal direction so as to include the above. Thereby, the co-rotation prevention wing 13
Are rotatable with respect to the rotating shaft 10.
In addition, the co-rotation prevention blade 13 has a length in the longitudinal direction longer than the excavation and stirring blades 12H, 12M, and 12L.
It is located outside the rotation outer diameter of 12M and 12L.

FIG. 8 shows the state of use of the ground improvement stirrer 9. After digging the ground in which an improved pillar is to be constructed, the soil and the solidifying agent slurry are mixed and stirred to improve the ground. 1 shows a ground improvement stirrer 9 in a step of producing soil. As shown in the figure, the rotating shaft 10 rotates clockwise, and accordingly, the excavating and stirring blades 12H, 12M, 12L
Also rotates clockwise. On the other hand, since the tip of the co-rotation prevention blade 13 penetrates and is held in the unexcavated ground, the earth and sand and the solidifying agent slurry cause the rotation shaft 10 to rotate by the rotation of the excavation stirring blades 12H, 12M, and 12L. Even if it rotates clockwise as the center and applies pressure in the clockwise direction to the surface of the anti-corotating wing 13,
Does not rotate with earth and sand, etc., and maintains a stationary state. As a result, clay soil and the like are excavated and stirred by the impeller 12H,
Even if it starts rotating together with 12M and 12L, its rotation is suppressed by the co-rotation prevention wings 13, and soil and the like are forcibly sheared. The slurry and the slurry can be surely mixed and stirred.

[0008]

However, in the ground improvement stirrer 9, when there is an obstacle such as a rock in the ground, the tip of the corotation prevention blade 13 hits the obstacle, and the ground improvement stirring is performed. It is possible that the aircraft 9 cannot be pushed into the ground. When the ground around the improved pillar is soft, the ground cannot keep the anti-corotating wings 13 in a stationary state, and the anti-corotating wings 13 may rotate together with earth and sand. The present invention has been made in view of the above points, and when constructing an improved pillar for increasing the ground support force, reliably preventing the co-rotation phenomenon from occurring, and improving the quality. It is intended to provide a means for producing soil.

[0009]

According to a first aspect of the present invention, there is provided a ground improvement stirrer having anti-corotating blades, wherein a hollow rotary shaft and a tip of the rotary shaft are provided. A drilling head provided, a drilling and stirring blade protruding from the tip end side of the rotary shaft to perform one or both of excavating and stirring the ground, and interpolating the rotary shaft proximal to the drilling and stirring blade. A hollow shaft having a counter-rotating wing provided at the tip of the hollow shaft, and a counter-rotating wing rotating in a direction opposite to the rotation direction of the excavating stirring wing, The anti-corotating wing is a part exposed from the hollow shaft, a sun gear fixed to the rotating shaft near the tip of the hollow shaft, and a sun gear parallel to the axial direction of the hollow shaft from the tip of the hollow shaft. Rotates on a fixed shaft that projects in the direction A satellite gear that is provided and meshes with the sun gear, an internal gear that is rotatably provided at the tip of the hollow shaft and meshes with the satellite gear, and a direction that intersects the axis of the outer peripheral surface of the internal gear. And a plate-like body protruding from the main body.

[0010] The ground improvement stirrer with anti-corotating wings according to claim 2 of the present invention is the ground improvement stirrer with anti-corotation wings according to claim 1, wherein Is equal to or smaller than the rotation outer diameter of the excavating stirring blade.

[0011]

Embodiments of the present invention will be specifically described below with reference to the drawings. Drawing 1 is a figure for explaining the composition of the ground improvement stirrer with counter-rotating wings concerning an embodiment of the invention, and shows the front and side of ground improvement stirrer 100 with counter-rotating wings. is there. As shown in FIG. 1, the ground improvement stirrer 100 with the co-rotation preventing blade has a hollow rotary shaft 14 having a discharge port 14a formed at the tip thereof.
And a drilling tip 110 at its tip,
4, at a fixed interval between the drilling head 11 and the rotating shaft 14, which are provided so as not to block the discharge port 14a at the tip of the nozzle 4.
A pair of excavating and stirring blades 12H and 12L provided to face each other so as to have a certain angle of inclination with respect to a horizontal plane, and a hollow shaft 15 into which the rotating shaft 14 closer to the base end than the excavating and stirring blades 12H is inserted; And an anti-corotating wing 101 provided at the tip of the hollow shaft 15.

Although not shown, the ground improvement stirrer 100 with the co-rotation-preventing wings is also provided on the column 3 fixed by the construction machine 2 so as to be able to move up and down in the same manner as described above. A solidifying agent slurry in which the mixing agent is kneaded is produced, and the solidifying agent slurry is pumped by a pump 5 to a ground improvement stirrer 100 with anti-corotating wings, and is rotated by an appropriate driving source. The shaft 14 is to be rotated.

The excavating and stirring blades 12H and 12L are provided so as to protrude in the horizontal direction, and the direction in which the excavating and stirring blades 12H protrude and the direction in which the excavating and stirring blades 12L protrude are centered on the rotating shaft 14. The phases are different by 90 degrees. Also, on one edge side of the excavation stirring blade 12L,
A drilling tip 110 is provided. The direction in which the excavating and stirring blades 12H protrude and the direction in which the excavating and stirring blades 12L protrude need not necessarily be provided differently, and can be freely designed in consideration of the efficiency of mixing and stirring the improved soil. it can.

FIG. 2 is a sectional perspective view showing a detailed configuration of the anti-corotating blade 101 of the ground improvement stirrer 100 with anti-corotating blade according to the present invention. , A sun gear 16 fixed to the rotating shaft 14 near the tip of the hollow shaft.
A satellite gear 18 rotatably provided on a fixed shaft 17 protruding from a tip of the hollow shaft 15 in a direction parallel to the axial direction of the hollow shaft 15 and meshing with a sun gear 16; And an internal gear 19 meshing with the satellite gear 18 and a plate-shaped body 20 protruding from the outer peripheral surface of the internal gear 19 in a direction intersecting the axis thereof.

Although not shown in the figure, the rotary shaft 14 and the sun gear 16 are provided with keys and the like which are fitted to both.
As a result, the sun gear 16 rotates with the rotating shaft 14. Further, three satellite gears 18 are provided around the sun gear 16, and three fixed shafts 17 are provided so as to protrude from the cross section of the distal end of the hollow shaft 15 in a direction parallel to the axis of the hollow shaft 15. Are rotatably provided at predetermined positions so as to mesh with the sun gear 16.

The internal gear 19 has a smooth inner peripheral surface near its upper end, and has a convex portion provided at the upper end in contact with the hollow shaft 15 and at the upper end of the internal gear 19. The protrusion 91 is sandwiched between a convex portion 51 provided on the outer peripheral surface near the tip of the hollow shaft 15 and an annular stopper 52 fixed to the outer peripheral surface of the hollow shaft 15. on the other hand,
The lower end of the internal gear 19 is supported by an annular stopper 41 fixed to the outer peripheral surface of the rotating shaft 14. Thus, the internal gear 19 is provided rotatably with respect to the rotating shaft 14 and the hollow shaft 15. Note that the shape of the stopper 41 and the stopper 52 is not particularly limited as long as the internal gear 19 can be rotatably maintained at the tip of the hollow shaft 15. Rotating shaft 14
Alternatively, it may be one that projects horizontally from the outer peripheral surface of the hollow shaft 15.

The plate-shaped body 20 is provided so as to protrude horizontally from the outer peripheral surface of the internal gear 19 so that the surface thereof has a constant angle with respect to the horizontal plane. The rotation outer diameter of the prevention blade 101 is smaller than that of the excavation stirring blade 12.
H and 12L are equivalent to the rotation outer diameter. The size of the plate-shaped body 20 may be freely designed within the range as long as the rotation outer diameter of the co-rotation prevention blade 101 is equal to or less than the rotation outer diameter of the excavating and stirring blades 12H and 12L. Can be.

The operation of the ground improvement stirrer 100 with the anti-corotating blade will be described below. FIG. 3 shows that after excavating the ground on which the improved pillar is to be constructed, the discharge port 14 of the rotating shaft 14 is formed.
This shows the ground improvement stirrer 100 with the anti-corotating wings in a state where the rotating shaft 14 is rotated while discharging the solidifying agent slurry from FIG. Here, the rotation of the sun gear 16, the satellite gear 18, and the internal gear 19 will be described with reference to FIG. Assuming that the rotating shaft 14 is rotated clockwise, as shown in FIG.
The sun gear 16 fixed to 4 also rotates clockwise, and the rotation is transmitted to each satellite gear 18 meshing with the sun gear 16, and each satellite gear 18 rotates with the rotation of the sun gear 16. The rotation of each satellite gear 18 is transmitted to an internal gear 19 that meshes with each satellite gear 18, so that the internal gear 19 rotates in a direction opposite to the sun gear 16, that is, counterclockwise. At this time, the internal gear 1 with respect to the sun gear 16
The ratio of the rotational force of No. 9 is equivalent to the ratio of the circumferential length of the sun gear 16 to the circumferential length of the internal gear 19. In this way, the rotation of the rotation shaft 14 is transmitted to the internal gear 19 through the sun gear 16 and the satellite gear 18 with the rotation direction reversed, and the plate-like body 20 is rotated in the opposite direction to the rotation direction of the rotation shaft 14. Rotate in the direction. Thereby, even if the clayey soil and the like start rotating together with the excavating and stirring blades 12H and 12L, the co-rotation preventing blade 10 that rotates in the opposite direction to the excavating and stirring blades 12H and 12L.
Due to 1, the rotation of earth and sand is suppressed, and the earth and sand are forcibly sheared.

As described above, according to the ground improvement stirrer 100 with the anti-corotating blade according to the present embodiment, the portion exposed from the hollow shaft 15 and fixed to the rotating shaft 14 near the tip of the hollow shaft. A sun gear 16, a satellite gear 18 rotatably provided on a fixed shaft 17 protruding from a tip end of the hollow shaft 15 in a direction parallel to the axial direction of the hollow shaft 15 and meshing with the sun gear 16, and a hollow shaft 1.
5, an internal gear 19 rotatably provided to mesh with the satellite gear 18, and a plate-shaped body 20 protruding from the outer peripheral surface of the internal gear 19 in a direction intersecting the axis thereof. The rotation of the rotating shaft 14 is transmitted to the internal gear 19 via the sun gear 16 and the satellite gear 18 in a reverse direction, so that the plate 20 is excavated. It rotates in the opposite direction to the stirring blades 12H and 12L. Accordingly, the mixed and stirred earth and sand are forcibly sheared, and the rotation of the earth and sand together with the excavating and stirring blades 12H and 12L is suppressed, so that the earth and sand and the solidifying agent slurry can be surely mixed and stirred. . In addition, since the rotation outer diameter of the anti-corotation wing 101 is equal to or less than the rotation outer diameter of the excavating and stirring wings 12H and 12L, there is no interference between the anti-corotation wing 101 and rocks and other obstacles in the ground. In addition, the corotation phenomenon can be reliably prevented without depending on the strength of the ground.

In this embodiment, two excavating and stirring blades 12H and 12L are provided in the vicinity of the tip of the rotary shaft 14. Even if it is reduced, the same effect as described above can be obtained.

[0021]

As described above, according to the ground improvement stirrer with anti-corotating blades according to the present invention, the portion exposed from the hollow shaft and fixed to the rotating shaft near the tip of the hollow shaft. A sun gear, a satellite gear that is rotatably provided on a fixed shaft that protrudes from a tip of the hollow shaft in a direction parallel to an axial direction of the hollow shaft, and meshes with the sun gear, and is rotatable at a tip of the hollow shaft. And an internal gear that meshes with the satellite gear, and an anti-rotation wing having a plate-like body protruding in a direction intersecting the axis of the internal gear on the outer peripheral surface of the internal gear. Therefore, the rotation of the rotating shaft is transmitted to the internal gear by reversing the direction of rotation via the sun gear and the satellite gear, and the plate-like body rotates in the opposite direction to the excavating and stirring blades, forcing soil and sand etc. To prevent co-rotation

Further, according to the present invention, since the rotation outer diameter of the anti-corotating blade is equal to or smaller than the rotation outer diameter of the excavating and stirring blade, the anti-corotating blade and the rocks in the ground are removed. Obstacles do not interfere, and the co-rotation phenomenon can be reliably prevented without depending on the strength of the ground.

[Brief description of the drawings]

FIG. 1 is a front view and a side view showing a configuration of a ground improvement stirrer 100 with anti-corotating blades according to an embodiment of the present invention.

FIG. 2 is a cross-sectional perspective view showing a detailed internal configuration of the anti-corotating blade 101 of the ground improvement stirrer 100 with anti-corotating blade.

FIG. 3 is a schematic diagram for explaining a use state of the ground improvement stirrer 100 with the anti-corotating blade.

FIG. 4 is a conceptual diagram showing a relationship among a sun gear 16, a satellite gear 18, and an internal gear 19;

FIG. 5 is a schematic view showing an improved pillar 6 and a knotted improved pillar 7 for increasing the ground supporting force.

FIG. 6 is a schematic view showing an apparatus used for a ground improvement method.

FIG. 7 is a front view and a side view showing a configuration of a ground improvement stirrer 9 having a co-rotation prevention blade.

FIG. 8 is a schematic diagram for explaining a use state of the ground improvement stirrer 9;

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Ground improvement stirrer with anti-rotational wings 101 Anti-rotational wings 11 Drilling heads 12H, 12L Drilling and stirring wings 14 Rotating shaft 15 Hollow shaft 16 Sun gear 17 Fixed shaft 18 Satellite gear 19 Internal gear 20 Plate-like body

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Hori 1-1-88 Oyodonaka, Kita-ku, Osaka Sekisui House Co., Ltd. F-term (reference) 2D040 AA01 AB05 AC02 EA04 EA13 EA16

Claims (2)

[Claims] 1. A hollow rotary shaft, a drilling head provided at a tip of the rotary shaft, and a protruding portion provided at a tip side of the rotary shaft,
Excavating and stirring blades for excavating and / or stirring the ground, a hollow shaft for inserting the rotating shaft proximal to the excavating and stirring blade, and a hollow shaft provided at the tip of the hollow shaft, A counter-rotating wing-equipped ground improvement stirrer comprising: a counter-rotating wing that rotates in a direction opposite to the rotation direction, wherein the counter-rotating wing is a portion exposed from the hollow shaft, A sun gear fixed to the rotating shaft near the tip of the shaft; and a rotatable fixed shaft protruding from the tip of the hollow shaft in a direction parallel to the axial direction of the hollow shaft;
A satellite gear that meshes with the sun gear; an internal gear that is rotatably provided at the tip of the hollow shaft and meshes with the satellite gear; and an outer peripheral surface of the internal gear that protrudes in a direction that intersects the axis thereof. A ground improvement stirrer with anti-corotating wings, comprising: 2. The improved ground stirrer with anti-corotating wings according to claim 1, wherein the anti-corotating wing has a rotational outer diameter equal to or less than the rotational outer diameter of the excavating stirring wing.