JP3241192U - soil improvement equipment - Google Patents

Abstract

A soil improvement device capable of rotating a pair of stirring blades rotating in mutually opposite directions by a single rotary drive device and less likely to fail due to the resistance force received from the soil.
A driving shaft (1), a first stirring blade (3) fixed to the driving shaft for stirring soil in an excavated hole, and a driven portion (7b) rotating in a direction opposite to the rotating direction of the driving shaft. a gear box 7 equipped with a gear box 7, a driven shaft 2 extending from the driven portion and rotating in the opposite direction together with the driven portion, and a second stirring blade 4 fixed to the driven shaft and stirring the soil, ground improvement equipment.
[Selection drawing] Fig. 1

Description

The present invention relates to a ground improvement device.

When constructing a building on soft ground, ground improvement work is carried out to improve the bearing capacity of the ground. In soil improvement work, a hardening agent such as cement slurry and soil are mixed while digging a hole, and a hardening improvement body is formed in the hole by hardening them. If the agitation between the hardening agent and the soil is insufficient, the hardened improved body after hardening does not satisfy the appropriate hardness standard, resulting in defective construction.

The ground improvement equipment used in such ground improvement work has agitation blades for agitating the soil and the hardening agent in addition to the excavating teeth for excavating the excavation holes. By using a pair of stirring blades rotating in opposite directions, the soil and hardening agent can be well stirred. For example, by fixing one stirring blade to the outer tube, fixing the other stirring blade to the inner tube provided inside the outer tube, and rotating the outer tube and the inner tube in opposite directions, each stirring The wings can rotate in opposite directions to each other.

In a double-type heavy machine, a rotary drive device for rotating the outer tube and a rotary drive device for rotating the inner tube are provided to rotate the outer tube and the inner tube in opposite directions. However, the double-type heavy machine has a drawback that the total weight increases due to the presence of two rotary drive units.

On the other hand, a soil improvement device called a single-type heavy machine is lighter and more compact than a double-type heavy machine because it is provided with only one rotary drive device that rotates the stirring blades. Therefore, single-type heavy machinery is suitable for ground improvement in narrow work sites. However, in a single-type heavy machine, the agitating blade rotates only in one direction, so there is a risk that the agitation between the soil and the hardening agent will be insufficient, resulting in poor construction.

A technique using planetary gears has been proposed as a technique for rotating a pair of stirring blades in opposite directions with only one rotary drive device (Patent Document 1). In this technique, agitating blades are fixed to a rotating shaft, an external gear is provided on the outer peripheral surface of the rotating shaft, and planetary gears that mesh with the external gear are provided. An internal gear meshing with the planetary gear is provided on the inner peripheral surface of the outer cylinder, and the reversing blade is fixed to the outer peripheral surface of the outer cylinder. According to this, since the planetary gear rotates the outer cylinder in the direction opposite to the rotating shaft, the stirring blade and the reversing blade rotate in the opposite direction to each other, so that the soil and the hardening agent can be satisfactorily stirred.

Japanese Utility Model Laid-Open No. 5-71232

However, in the technique disclosed in Patent Document 1, the resistance force that the reversing blades receive from the soil may directly act on the outer cylinder, causing the outer cylinder to be distorted. As a result, the planetary gear, the internal gear, and the external gear inside the outer cylinder do not mesh with each other, which may cause the device to malfunction.

The present invention has been made in view of such a situation, and it is possible to rotate a pair of stirring blades that rotate in opposite directions with a single rotary drive device, and to prevent failure due to the resistance force received from the soil. It aims at providing the ground improvement apparatus which is hard to carry out.

The present application includes a plurality of means for solving at least part of the above problems, and examples thereof are as follows.

In order to solve the above problems, a soil improvement device according to one aspect of the present invention includes a drive shaft, a first stirring blade fixed to the drive shaft and stirring the soil in the excavation hole, and the drive shaft. A gearbox having a driven portion that rotates in a direction opposite to a rotational direction, a driven shaft that extends from the driven portion and rotates in the opposite direction together with the driven portion, and is fixed to the driven shaft to agitate the soil. and a second stirring impeller.

In the above soil improvement device, the gearbox includes a sun gear fixed to the outer periphery of the drive shaft, a planetary gear meshing with the sun gear, and rotatable with respect to the driven part, and rotates the planetary gear It may further include a fixed portion for pivotal support and an internal gear fixed to an inner surface of the driven portion and meshing with the planetary gear.

In the above soil improvement device, a rotation prevention wing that is rotatably provided on the drive shaft and sticks into the wall of the excavation hole, and a rotation prevention wing fixed to the fixing part so as to face the main surface of the rotation prevention wing with a gap therebetween. and a restricting plate that restricts rotation of the fixed portion accompanying rotation of the drive shaft by coming into contact with the main surface.

In the above ground improvement apparatus, the driven part may have a tapered shape with a diameter decreasing in the depth direction of the excavated hole, and the driven shaft may extend from the tip of the tapered driven part.

In the above soil improvement device, the drive shaft is inserted through the driven shaft, and the tip of the drive shaft is exposed from the driven shaft and fixed to the tip of the drive shaft to excavate the soil. a digging tooth for forming said digging hole.

ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide a soil improvement device that can rotate a pair of stirring blades that rotate in opposite directions with one rotary drive device and that is less likely to fail due to the resistance force received from the soil. .

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

FIG. 1 is a perspective view of an example of a soil improvement device according to this embodiment. FIG. 2 is a top view of an example of the soil improvement device according to this embodiment. FIG. 3 is a perspective view of an example of each gear housed in a gearbox. FIG. 4 is a partially cross-sectional perspective view of the gearbox and its surroundings.

An embodiment according to the present invention will be described below with reference to the drawings. Note that, in principle, the same members are denoted by the same reference numerals in all the drawings for describing one embodiment, and repeated description thereof will be omitted. In addition, in the following embodiments, it goes without saying that the constituent elements (including element steps and the like) are not necessarily essential unless otherwise specified or clearly considered essential in principle. stomach. In addition, when saying "consisting of A", "consisting of A", "having A", or "including A", other elements are excluded unless it is explicitly stated that only those elements are included. It goes without saying that it is not something to do. Similarly, in the following embodiments, when referring to the shape, positional relationship, etc. of components, etc., unless otherwise explicitly stated or in principle clearly considered to be otherwise, the actual shape, etc. shall include those that are similar or similar to

<This embodiment>
FIG. 1 is a perspective view of an example of a soil improvement device according to this embodiment. This ground improvement apparatus is an apparatus for agitating a hardening agent such as cement slurry and soil while digging an excavated hole to form a hardening improvement body in which the hardening agent and the soil are hardened. As an example, the soil improvement device has a double-tube structure driving shaft 1 and driven shaft 2, and from the top, a first stirring blade 3, a rotation preventing blade 6, a gear box 7, and a second stirring blade 4. , and digging teeth 5 .

The drive shaft 1 is connected to a rotation drive device such as a motor (not shown), and rotates in a first rotation direction A. As shown in FIG. Only one rotary drive device for rotating the drive shaft 1 is required. Therefore, this soil improvement equipment is a single type heavy machine.

The first stirring impeller 3 is fixed to the middle portion of the drive shaft 1 and rotates in the first rotation direction A like the drive shaft 1 .

The gearbox 7 houses a plurality of gears that convert a first direction of rotation A into a second direction of rotation B opposite thereto. In this example, the gearbox 7 comprises a fixed portion 7a and a driven portion 7b. The fixing portion 7a is a portion that rotatably supports the drive shaft 1 and is fixed without rotating with respect to an excavation hole (not shown). On the other hand, the driven portion 7b is rotatable with respect to the fixed portion 7a, and rotates in the second rotational direction B when the drive shaft 1 rotates in the first rotational direction A. As shown in FIG.

The shape of the driven portion 7b is tapered such that the diameter decreases in the depth direction D of the excavated hole (not shown). More preferably, the driven portion 7b is conical. Such a tapered or conical shape can reduce the resistance that the gearbox 7 receives from the soil during excavation, and can suppress the load applied to the gears in the gearbox 7 .

The rotation prevention blade 6 is a blade for preventing the fixed portion 7a from rotating in the first rotation direction A as the drive shaft 1 rotates, and is rotatably provided on the drive shaft 1. FIG. The blade length of the rotation prevention blade 6 is longer than the blade length of each of the stirring blades 3 and 4 and the digging teeth 5 . Therefore, during excavation, the tip of the anti-rotation wing 6 sticks into the wall of the excavated hole, and the anti-rotation wing 6 is fixed to the excavated hole.

A regulating plate 8 is fixed to the upper surface of the fixed portion 7a so as to sandwich both main surfaces of the rotation preventing blade 6. As shown in FIG. Thereby, the fixed part 7a is fixed to the excavated hole (not shown) together with the anti-rotation wing 6 during excavation.

The driven shaft 2 is formed by molding a tapered driven portion 7b into a tubular shape extending in the depth direction D, and rotates in the second rotation direction B together with the driven portion 7b.

A second stirring blade 4 is fixed in the middle of the driven shaft 2 . The second impeller 4 rotates in a second direction of rotation B opposite to the first impeller 3 . By rotating the stirring blades 3 and 4 in opposite directions to each other in this way, the soil and hardening agent in the excavated hole (not shown) can be well stirred by the stirring blades 3 and 4, and the ground improvement work is poor. Construction work can be prevented.

Further, the drive shaft 1 is inserted through the interior of the tubular driven shaft 2 in the depth direction D, and the tip of the drive shaft 1 is exposed from the driven shaft 2 . A digging tooth 5 is fixed to the tip of the drive shaft 1 thus exposed. The digging tooth 5 rotates in the first direction of rotation A like the drive shaft 1 and digs the soil to form a dig hole.

FIG. 2 is a top view of an example of the soil improvement device according to this embodiment. 2, the stirring blades 3 and 4 and the digging teeth 5 are omitted.

As shown in FIG. 2, the restricting plate 8 is fixed to the fixing portion 7a so as to face the main surface 6a of the anti-rotation blade 6 with a gap S therebetween. The fixing means is not particularly limited, and the regulation plate 8 can be fixed to the fixing portion 7a by any means such as fastening with a fastening member (not shown), welding, welding, or adhesion. Alternatively, the restricting plate 8 and the fixing portion 7a may be integrally molded. The main surface 6a and the main surface of the restricting plate 8 are both perpendicular to the horizontal plane and parallel to the direction in which the drive shaft 1 extends. Two regulating plates 8 form one set, and two sets of regulating plates 8 are provided in total. A pair of restricting plates 8 are arranged so as to face each other, and sandwich a pair of left and right wings of the rotation preventing blade 6 with a gap S therebetween. Furthermore, the rotation prevention blade 6 is arranged above the regulation plate 8, and the lower side of the regulation plate 8 is fixed to the fixing portion 7a.

Since the tip of the rotation preventing blade 6 is fixed by sticking into the wall (not shown) of the excavation hole, even if the fixing portion 7a tries to rotate with the rotation of the drive shaft 1 during excavation, the restricting plate 8 prevents the rotation preventing blade 6 from rotating. , and the rotation of the fixing portion 7a can be regulated by the regulating plate 8. As shown in FIG.

Since the anti-rotation wing 6 advances through the wall of the excavated hole during excavation, a large force acts from the wall and causes distortion. If the distortion is directly transmitted to the fixing portion 7a, the gearbox 7 will also be distorted. Since each gear in the gear box 7 is meshed with high precision and is delicate, there is a possibility that the gears may not mesh with each other if the gear box 7 is distorted.

In this embodiment, as described above, the anti-rotation blades 6 are rotatable with respect to the drive shaft 1, and the gap S exists between the regulation plate 8 and the anti-rotation blades 6, so that the anti-rotation blades 6 are not distorted. However, the distortion is not directly transmitted to the gearbox 7. As a result, the gear box 7 is less likely to be distorted, and it is possible to prevent the gears inside the gear box 7 from meshing with each other.

FIG. 3 is a perspective view of an example of each gear housed in the gearbox 7. FIG. As shown in FIG. 3 , the gearbox 7 accommodates a sun gear 9 , planetary gears 10 and an internal gear 11 .

The sun gear 9 is fixed to the outer circumference of the drive shaft 1, and planetary gears 10 are arranged in a star shape around it. The planetary gear 10 is a small gear that meshes with the sun gear 9 and is rotatably supported by the fixed portion 7a. Although the number of planetary gears 10 is not particularly limited, three planetary gears 10 are provided here. The internal gear 11 is fixed to the inner surface of the driven portion 7b so as to mesh with each planetary gear 10. As shown in FIG.

When the driving shaft 1 rotates in the first rotation direction A with the fixed part 7a fixed to the excavation hole (not shown) by the action of the rotation preventing wing 6, the internal gear 11 and the driven part 7b fixed thereto are rotated. and are rotated in the second rotation direction B by the planetary gear 10 . As a result, the driven shaft 2 and the drive shaft 1 extending from the driven portion 7b can be rotated in opposite directions.

FIG. 4 is a partially cross-sectional perspective view of the gearbox 7 and its surroundings. As shown in FIG. 4, the internal gear 11 and the driven portion 7b are fixed to each other by screws 19. As shown in FIG. Further, as described above, the tubular driven shaft 2 extends from the tip of the tapered driven portion 7b. The drive shaft 1 and the driven shaft 2 have a double tube structure, and the drive shaft 1 is inserted through the driven shaft 2 in a rotatable state. The anti-rotation blade 6 is rotatably provided on the drive shaft 1 at a position where it does not come into contact with the regulation plate 8 in the initial state. Further, the fixed part 7a and the driven part 7b are rotatably connected to each other without being separated. As an example, by providing a flange on the outer peripheral side surface of the driven portion 7b and providing a groove in the fixed portion 7a in which the flange fits, the fixed portion 7a and the driven portion 7b can be rotatably connected to each other without being separated. can.

According to the soil improvement device described above, as shown in FIG. 1, instead of fixing the second stirring blade 4 to the outer peripheral side surface of the gearbox 7, the A second stirring blade 4 is fixed to the driven shaft 2 . Therefore, the force applied from the soil or hardening agent to the second stirring blade 4 during stirring does not directly act on the gear box 7 , and the gear box 7 is less likely to be distorted. As a result, it is possible to prevent the gears 9 to 11 densely arranged in the gear box 7 from being disengaged due to the distortion of the gear box 7, and it is possible to suppress the failure of the ground improvement device.

Moreover, since the stirring blades 3 and 4 rotating in opposite directions can be rotated by only one rotary drive device, the soil and the hardening agent can be well stirred, and the ground improvement device can be made lightweight. and can be made compact.

The present invention is not limited to the embodiments and modifications described above, and various modifications are possible. For example, the above-described embodiments and modifications have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, it is possible to replace a part of a given modified example with another modified example, or combine modified examples.

For example, the ground improvement device according to the above-described embodiment is a single-type heavy machine that rotates the drive shaft 1 only with one rotary drive device, but removes one rotary drive device provided in the rotary drive device of the double-type heavy machine. , the drive shaft 1 may be rotated by the remaining one rotary drive device.

In addition, the above soil improvement device may be used as a stirring device for purposes other than soil improvement. For example, the above soil improvement device may be used as a stirring device for stirring a viscous liquid and a semi-solid substance. For example, the building industry may use a ground improvement device as an agitating device to agitate cement, plaster, asphalt, inks, and adhesives, for example.

Furthermore, in the food industry, the soil improvement device may be used as a stirring device for stirring bread dough such as wheat flour, noodle dough, and dairy products such as butter and cheese.

DESCRIPTION OF SYMBOLS 1... Drive shaft, 2... Driven shaft, 3... 1st stirring blade, 4... 2nd stirring blade, 5... Excavating tooth, 6... Anti-rotation blade, 6a... Main surface, 7... Gearbox, 7a... Fixed Part, 7b... Driven part, 8... Regulating plate, 9... Sun gear, 10... Planetary gear, 11... Internal gear, 19... Screw.

Claims (5)

a drive shaft;
a first stirring blade fixed to the drive shaft and stirring the soil in the excavated hole;
a gearbox having a driven portion that rotates in a direction opposite to the direction of rotation of the drive shaft;
a driven shaft extending from the driven portion and rotating in the opposite direction together with the driven portion;
a second stirring blade fixed to the driven shaft and stirring the soil;
Soil improvement equipment having. The ground improvement device according to claim 1,
The gearbox is
a sun gear fixed to the outer periphery of the drive shaft;
a planetary gear meshing with the sun gear;
a fixed portion that is rotatable with respect to the driven portion and that rotatably supports the planetary gear;
an internal gear fixed to the inner surface of the driven portion and meshing with the planetary gear;
A ground improvement device further comprising: The ground improvement device according to claim 2,
a rotation-preventing wing rotatably provided on the drive shaft and sticking into the wall of the excavation hole;
a restricting plate fixed to the fixed portion so as to face the main surface of the rotation preventing blade with a gap therebetween, and a regulating plate that abuts against the main surface to restrict rotation of the fixed portion accompanying rotation of the drive shaft; and,
A ground improvement device further comprising: The ground improvement device according to any one of claims 1 to 3,
The driven portion has a tapered shape whose diameter decreases in the depth direction of the excavated hole, and the driven shaft extends from the tip of the tapered driven portion.
Soil improvement device. The ground improvement device according to any one of claims 1 to 3,
the drive shaft is inserted through the interior of the driven shaft, and a tip end of the drive shaft is exposed from the driven shaft;
an excavating tooth fixed to the tip of the drive shaft for excavating the soil to form the excavation hole;
A ground improvement device further comprising:

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