JP2003301450A - Soil improving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil improving apparatus which can reduce manufacturing costs and can enhance efficiency of execution of work, because an increase in the strength of the whole apparatus is made unnecessary and the constitution of the whole apparatus is simplified. <P>SOLUTION: This soil improving apparatus 1, in which soil is improved by excavating an excavated groove 9 by means of a rotary drive part (rotary means) 10 which is provided at a lower end of an ascending/descending device 4 ascendable/descendable along a guide rail 2 supported on a base machine 3, is characterized a follows: the drive part 10 is equipped with an upper hollow motor (first hollow motor) 30, an inner shaft (first rotating shaft) 13 which is coupled to the hollow motor 30, a lower hollow motor (second hollow motor) 40, and an outer shaft (second rotating shaft) 14 which is coupled to the hollow motor 40; the respective hollow motors 30 and 40 are provided so as to be vertically aligned in a row; the inner shaft 13 is internally inserted into the outer shaft 14; and the inner shaft 13 and the outer shaft 14 are constituted so as to be rotatable in mutually opposite directions. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to excavating a trench,
The present invention relates to a ground improvement device for improving the ground in the excavation trench.

[0002]

2. Description of the Related Art Conventionally, as an example of a ground improvement apparatus for improving the ground by excavating an excavation trench, injecting a soil improvement agent such as a solidifying agent into the excavated soil and agitating in the excavation trench, FIG. As shown in FIG. 2, two shafts 51, 51 rotatable in opposite directions to each other about a vertical axis are supported by a base machine (not shown) installed on the ground, and the two shafts 51, 5 are
There is a ground improvement device 50 for excavating the excavation groove 9 by the excavation blades 52 installed at the lower end portions of the No. 1 and stirring the excavated soil by the stirring blades 53, 53 mounted above the excavation blade 52. . In this configuration, each shaft 51, 51
Since the stirring blades 53, 53 attached to the rotor rotate in the opposite directions around the vertical axis, the excavated soil can be efficiently stirred by the shearing effect between the stirring blades 53, 53.

[0003]

However, the conventional ground improvement device 50 has the following problems. To rotate the two shafts 51, 51, each shaft 51,
Install a motor for each 51 or 1 as shown in FIG.
It is necessary to install a gear mechanism 55 capable of rotating the two shafts 51, 51 by the base motor 54. At this time, the gear mechanism 5
5 or a motor (hereinafter, referred to as “gear mechanism or the like”) acts on the gear mechanism 55 because the rotational reaction force of each shaft 51, 51 acts.
It is necessary to firmly fix the gears, etc., and normally, the gear mechanism 55 and the like are directly fixed to the base machine to secure the strength. As a result, the shafts 51, 51 connecting the gear mechanism 55 and the like to the excavating blade 52 become long, so that the respective shafts 51, 5
By increasing the rigidity of No. 1, the stirring blade 53 and the excavating blade 52 during construction are stabilized.

Therefore, in the conventional ground improvement device 50, it is necessary to firmly fix the gear mechanism 55 and the like for rotating the shafts 51, 51, and the weight of each shaft 51 having high rigidity increases. Therefore, it is necessary to increase the strength of the entire device 50, and there is a problem that the manufacturing cost increases. Further, in order to prevent the rigidity of the shaft 51 from being lowered when the shaft 51 is replenished corresponding to the depth of the excavation groove 9, it is necessary to firmly connect the shafts 51 to each other and reduce the connection interval. However, there is a problem that the construction efficiency is reduced.

Therefore, the present invention has been made in order to solve the above problems, and it is not necessary to increase the strength of the entire apparatus, and the structure of the entire apparatus is simplified, so that the manufacturing cost can be reduced. It is an object of the present invention to provide a ground improvement device that can improve the construction efficiency as well as the construction.

[0006]

The present invention is configured to solve the above problems, and the invention according to claim 1 is a base machine, and a guide rail supported by the base machine. A ground improvement device that includes an elevating device that can be moved up and down along a guide rail, and a rotating unit that is provided at a lower end of the elevating device, excavates an excavation groove by the rotating unit, and improves the ground in the excavation groove. And the rotating means is
A first hollow motor having a first through hole, a hollow first rotating shaft connected to the output portion of the first hollow motor in the first through hole, and a second hollow motor having a second through hole A hollow second rotating shaft connected to the output portion of the second hollow motor in the second through hole, wherein the first hollow motor and the second hollow motor are arranged in a row in the vertical direction, The first rotary shaft is inserted in the hollow portion of the second rotary shaft, and the first rotary shaft and the second rotary shaft are configured to be rotatable in mutually opposite directions.

Here, the structure of the base machine is not limited to a self-propelled type or a fixed type, as long as it can reliably support the support shaft. Further, the rotating means is an existing hollow motor having a through hole, and the drive system such as hydraulic type or electric type is not limited.

According to the present invention, by rotating the first rotary shaft and the second rotary shaft in concentric positions in opposite directions, the rotational reaction force acting on the first hollow motor and the second hollow motor is canceled. Since it is not necessary to firmly fix each hollow motor, each hollow motor can be easily installed at the lower end of the lifting device. Also, by using a hollow motor, the rotation center of the output part of the motor and the rotation center of each shaft that excavates the excavation groove are at the same position without installing a gear mechanism, etc. Can be increased.

The invention described in claim 2 is the same as claim 1.
A ground improvement device according to claim 1, wherein a stirring blade is attached to each of the first rotating shaft and the second rotating shaft,
A digging blade for digging a digging groove is attached to the lower end of the first rotary shaft or the second rotary shaft.

According to the present invention, when the stirring blade and the excavating blade are moved up and down by the elevating device, the hollow motors of the first rotating shaft and the second rotating shaft also move up and down, so that the stirring blade and the excavating blade are moved. With this, the distance between each hollow motor is always small, and the stirring blade and the excavating blade are stable during construction. Therefore, it is not necessary to increase the rigidity of the first rotating shaft and the second rotating shaft, and the weight of each shaft can be reduced.

Therefore, in the ground improvement device of the present invention,
By disposing the first rotating shaft and the second rotating shaft at concentric positions and rotating the shafts in mutually opposite directions, it is possible to reduce the rotational reaction force acting on the hollow motor of each shaft.
It is not necessary to increase the strength of the entire device, the structure of the device is simplified, the manufacturing cost can be reduced, and the construction efficiency can be improved.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In this embodiment, a case will be described as an example in which a ground improvement device is used to excavate a vertical excavation groove and the soil in the excavation groove is improved.

FIG. 1 is a side view showing a ground improvement device according to an embodiment of the present invention. FIG. 2 is a side sectional view showing a rotation drive unit of the ground improvement device according to the embodiment of the present invention. FIG. 3 is a side view showing another configuration of the ground improvement device according to the embodiment of the present invention.

First, the structure of the ground improvement device according to the embodiment of the present invention will be described. As shown in FIG. 1, the ground improvement device 1 includes a base machine 3 supporting a vertical guide rail 2, an elevating device 4 capable of ascending and descending along the guide rail 2, and a lower end portion of the elevating device 4. The rotary drive unit (rotating means) 10 is installed.
This is a device for excavating the excavation trench 9 by and stirring the excavated soil in the excavation trench 9.

Next, each component will be described. As shown in FIG. 1, the base machine 3 includes an arm 5 that supports the guide rail 2 in the vertical direction, a caterpillar 6 that is a moving unit of the base machine 3, and an operator cab 7. The lifting device 4 is, as shown in FIG.
Is fixed to one end of a wire (not shown) suspended via a pulley 8 installed at the upper end of the guide rail 2, and a drum (not shown) installed in the base machine 3 runs the wire. By winding or unwinding, the entire device can be vertically moved up and down along the guide rail 2.

As shown in FIGS. 1 and 2, the rotary drive unit 10 includes a support shaft 11 whose upper end is fixed to the lifting device 4, and
The through holes 31 and 41 in the vertical direction are provided, and the through holes 31 and 4 are provided.
Upper hollow motors (first hollow motors) vertically arranged in line at the lower end of the support shaft 11 so that 1 is in a concentric position.
30 and a lower hollow motor (second hollow motor) 40, a hollow outer shaft 14 axially supported by an output portion 42 of the lower hollow motor 40, and a drilling blade 12 at a lower end portion thereof.
0 and a hollow inner shaft 13 axially supported by the output unit 32, the inner shaft 13 being inserted in the outer shaft 14,
And the drilling blade 12 and the lower hollow motor 40 in the outer shaft 14
Stirring blades 15 and 16 are attached between and.

The support shaft 11 is a lightweight column whose upper end is fixed to the elevating device 4, and a plurality of support shafts 11 can be extended by connecting them in the vertical direction. Since the support shaft 11 does not require high rigidity, it has a structure that can be easily connected and the connection interval is also large. The upper hollow motor 30 and the lower hollow motor 40 have through holes 3 in the vertical direction.
A hydraulic hollow motor having 1, 41, each through hole 3
The output parts 32 and 42 installed in the intermediate parts of the parts 1 and 41 are configured to rotate about the vertical axis in mutually opposite directions. In addition, reference numerals 33 and 43 are bearings for rotatably supporting the shafts 13 and 14 inserted in the through holes 31 and 41, respectively.

The outer shaft 14 has a lower hollow motor 40 at the upper end.
It is a hollow tube that is rotatable around a vertical axis by being supported by the output part 42 of the bearing via a bearing 43. Further, the lower end portion 20 of the outer shaft 14 is divided at a predetermined interval,
Outer stirring blades 16, 16 attached to both sides of the outer shaft 14.
Are connected by. The inner shaft 13 is a hollow tube that is rotatable in the opposite direction at the concentric position with the outer shaft 14 by having the upper end supported by the output part 32 of the upper hollow motor 30 via the bearing 33. 14 is inserted in the hollow part, and a drilling blade 12 for drilling the drilling groove 9 is installed at the lower end, and both sides of the inner shaft 13 above the drilling blade 12 are exposed to the outside. Inner stirring blades 15 and 15 are attached. In addition, the inner shaft 13 is provided with a hollow portion 17 communicating with a ground improvement agent supply device (not shown), and a discharge port 18 is provided at the lower end of the hollow portion 17, and An inflow port 19 is provided at the upper end.

The outer stirring blade 16 has two blade pieces 22, 2 inside a pair of frames 21 formed in a substantially U shape.
2 is installed at a predetermined interval, and the frame 2
Both ends of 1 are arranged vertically, and the lower end is the outer shaft 1
The outer shaft 14 in a divided state is connected by being attached to the lower end portion 20 of the No. 4 and the upper end portion is attached to the outer shaft 14 main body, and the wing piece is provided inside the central portion of the frame 21 in the vertical direction. 22 and 22 are attached. The inner stirring blade 15 has a configuration in which one blade piece 24 is installed on the outer side of a pair of frames 23 formed in a substantially U shape, and both end portions of the frame 23 are vertically arranged. The wing portion 24 is attached to the inner shaft 13 and is attached to the outside of the central portion of the frame 23 in the vertical direction. The vertical width of the inner stirring blade 15 is set within the space between the lower end portion 20 of the outer shaft 14 and the main body of the outer shaft 14, and the horizontal width is set outside the inner stirring blade 15. The blade piece 24 is located between the upper and lower blade pieces 22, 22 installed inside the outer stirring blade 21, and is formed so that the blade pieces 22, 24 are alternately arranged.

Therefore, in the ground improvement device 1 according to the embodiment of the present invention, when the inner shaft 13 and the outer shaft 14 are rotated, they are arranged concentrically outside the rotating inner stirring blade 15. Since the outer stirring blade 16 rotates in the opposite direction,
The rotational reaction force acting on the upper hollow motor 30 and the lower hollow motor 40 is significantly reduced. As a result, it is not necessary to firmly fix the upper hollow motor 30 and the lower hollow motor 40. Therefore, by simply installing the hollow motors 30 and 40 at the lower end of the support shaft 11 and moving the support shaft 11 up and down, The hollow motors 30 and 40 can be moved up and down together with the stirring blades 15 and 16 and the excavating blade 12. Therefore, the intervals between the stirring blades 15 and 16 and the digging blade 12 and the hollow motors 30 and 40 are always small, and there is no need to increase the rigidity of the inner shaft 13 and the outer shaft 14.
3 and the outer shaft 14 are lightweight. That is, the device 1
Since it is not necessary to increase the overall strength, the overall configuration of the device 1 is simplified and the manufacturing cost is reduced.

Next, a ground improvement method using the ground improvement apparatus 1 according to the embodiment of the present invention will be described. First, as shown in FIG. 1, the base machine 3 is moved to the side of a predetermined position for ground improvement, and the guide rail 2 in the vertical direction is installed. Then, the elevating device 4 is lowered to rotate the rotary drive unit 10.
The excavating blade 12 installed at the lower end of the is contacted with the ground surface. Further, the upper hollow motor 30 and the lower hollow motor 4
0 is driven to rotate the inner shaft 13 and the outer shaft 14, and the ground is excavated by the excavating blade 12 installed at the lower end of the inner shaft 13,
The elevating device 4 sequentially lowers the excavation blade 12 to construct the excavation groove 9 having a predetermined depth. At this time, each hollow motor 3
The distance between 0 and 40 and the digging blade 12 is always small and constant, and the hollow motors 30 and 40 are driven to descend into the digging groove 9 together with the digging blade 12, so that the digging blade 12 is in a stable state. Here, when the excavating blade 12 does not reach the predetermined depth even if the elevating device 4 is lowered to the lower end portion of the guide rail 2, the support shaft 11 is added to lower the excavating blade 12. The support shaft 11 is lightened due to low rigidity, is easily joined, and has a large joining interval, so that the support shaft 11 can be easily replenished. Further, since the hollow motors 30 and 40 are installed at the lower end of the support shaft 11, even if the support shaft 11 is added, the distance between the hollow motors 30 and 40 and the excavating blade 12 is always kept small and constant. The excavating blade 12 becomes stable.

Next, after the excavating blade 12 reaches a predetermined depth, the ground improvement agent is injected into the excavated earth and sand accumulated in the excavated trench 9 through the discharge port 18 of the inner shaft 13. Then, the excavated earth and sand are mixed with the stirring blades 15 and 16 rotating in opposite directions.
It is efficiently stirred due to the shearing effect between them. Finally, while the ground improvement agent is being injected and the excavated earth and sand are being stirred, the rotary drive unit 10 is moved up and down to be removed from the excavation groove 9. As a result, the excavated soil in the excavation trench 9 is hardened by the ground improving agent, and the ground at a predetermined position is improved.

Therefore, in the ground improvement device 1 according to the embodiment of the present invention, the construction of the entire device 1 is simplified, and therefore the ground improvement work efficiency is increased.

An example of the preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and design changes can be appropriately made without departing from the spirit of the present invention. For example, as shown in FIG. 3, an existing earth auger 3 ′ may be used for the base machine, and in this configuration, the auger screw 25 is used as a part of the lifting device, and each hollow motor 30 is provided at the lower end portion thereof. , 40,
Since the stirring blades 15 and 16, the excavating blade 12 and the hollow motors 30 and 40 are moved up and down by raising and lowering the auger screw 25, and the existing device is used, the manufacturing cost of the ground improvement device 1 is significantly reduced. It

[0026]

According to the ground improvement device of the present invention, by rotating the first rotating shaft and the second rotating shaft in concentric positions in opposite directions, the rotational reaction force acting on the hollow motor of each shaft is canceled. Therefore, it is not necessary to firmly fix each hollow motor, and the hollow motor can be easily installed at the lower end of the support shaft. Further, in the configuration in which the stirring blade and the excavating blade are installed on each rotating shaft, when the stirring blade and the excavating blade are moved up and down, the hollow motor of each shaft can be moved up and down together with the stirring blade and the excavating blade, so the stirring blade Also, the distance between the digging blade and the rotating means is always small, and the stirring blade and the digging blade are stable during construction. Therefore, it is not necessary to increase the rigidity of the inner shaft and the outer shaft, and the weight of each shaft can be reduced. Therefore, the structure of the device can be simplified, the manufacturing cost can be reduced, and the construction efficiency can be improved. it can.

[Brief description of drawings]

FIG. 1 is a side view showing a ground improvement device according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a rotation drive unit of the ground improvement device according to the embodiment of the present invention.

FIG. 3 is a side view showing another configuration of the ground improvement device according to the embodiment of the present invention.

FIG. 4 is a front view showing a conventional ground improvement device.

[Explanation of symbols]

1 ... Ground improvement device 2 ... Guide rail 3 ... Base machine 4 ··· Lifting device 9 ... Drilling trench 10 ... Rotation drive unit 11 ... Support shaft 12 ... Drilling blade 13 ... Inner shaft 14 ... Outer shaft 15 ... Inside stirring blade 16 ... Outside stirring blade 30 ··· Upper hollow motor 40 ... Lower hollow motor

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 395021723             Light Industry Co., Ltd.             2-9-8 Aoki, Kawaguchi City, Saitama Prefecture (72) Inventor K. Suzuki             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Masao Arai             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Ryo Takekawa             1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Makoto Yamashita             1-6-17 Meguro, Meguro-ku, Tokyo Stock market             Shatone (72) Inventor Kenichi Endo             2-14 Yobacho, Shinjuku-ku, Tokyo Seiwa Machinery Co., Ltd.             Inside the company (72) Inventor Koichi Togawa             4 2-35, Kudankita 4-chome, Chiyoda-ku, Tokyo             Within Ito Industry Co., Ltd. F-term (reference) 2D040 AB05 BA08 BC01 DB07 EA11                       EA16 EA21

Claims (2)

[Claims] 1. A base machine, a guide rail supported by the base machine, an elevating device capable of ascending and descending along the guide rail, and a rotating means provided at a lower end portion of the elevating device. A ground improvement device for excavating an excavation groove by the rotating means to improve the ground in the excavation groove, wherein the rotating means comprises a first hollow motor having a first through hole, and the first penetrating motor. A hollow first rotating shaft connected to the output part of the first hollow motor in the hole; a second hollow motor having a second through hole; and a second hollow motor in the second through hole. A hollow second rotary shaft connected to the output part of the first hollow motor, the first hollow motor and the second hollow motor are vertically arranged in a line, and the first rotary shaft is the second rotary shaft. Inserted in the hollow part of the shaft, and Wherein the first rotary shaft second rotation axis is soil improvement apparatus characterized by being rotatable in opposite directions to each other. 2. A stirring blade is attached to each of the first rotary shaft and the second rotary shaft, and the excavation groove is provided at a lower end portion of the first rotary shaft or the second rotary shaft. The ground improvement device according to claim 1, further comprising an excavating blade for excavating.