JP3034227B2 - Splicing device for agitating device and rotating mechanism of ground improvement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer and a rotation mechanism in a soil improvement device capable of excavating a hole in the ground and improving the ground by rotating the inner and outer double rotation shafts for stirring in mutually opposite directions. Related to a splicing device.

[0002]

2. Description of the Related Art In order to improve soft ground, a method has been used in which a hole is excavated in the ground, excavated soil and a hardening agent are stirred and kneaded in the hole, and the ground is improved by hardening. . For excavation of the hole, a base machine or the like is used, and a plurality of agitating bodies such as a plurality of agitating rods are vertically protruded in the vertical direction of a single axis of rotation, and the plurality of agitating rods are attached to the axis. With the rotation of the rotating shaft, the method of rotating the shaft together (together) and mixing the excavated soil and the hardening agent while stirring and kneading the hardening agent while spraying the hardening agent as described above is used to improve the ground by hardening. I have. However, a ground improvement device in which a plurality of agitating rods are provided vertically in the vertical direction of such a single rotating shaft so as to project in a direction perpendicular to the axis, and the plurality of agitating rods are integrally rotated with the rotation of the rotating shaft. In this case, since all of the plurality of stirring rods rotate integrally with the rotating shaft, a so-called co-rotation phenomenon that the excavated soil rotates integrally with the coaxial axis occurs, and sufficient stirring and kneading cannot be performed. In the case where the hardening agent is difficult to knead like the ground made of soil, the excavated soil will be in a dumpling state wrapping around the stirring rod,
There is a disadvantage that stirring and kneading cannot be performed.

[0003] Therefore, a rotating shaft for stirring is constituted by a double shaft of an inner shaft and an outer shaft, and a stirring blade body and a stirring rod are protruded from the inner and outer shafts so that the inner and outer double shafts are moved in opposite directions. A ground improvement device having a stirring structure adapted to be rotated has been proposed. Next, an example of ground improvement using the ground improvement device will be described. As shown in FIG. 9, the ground improvement device 1 includes a base machine 2 and a hardening agent supply pump 3 which are configured to be movable.
The base machine 2 supports the rotating shaft 5 vertically by the leader 4 and is attached to the rotating shaft 5 and its distal end by a driving motor 6 interposed between the reader 4 and the rotating shaft 5. The rotating shaft 5 is lowered along the leader 4 while rotating the excavating blade portion 7 so as to excavate a circular column-shaped excavating hole 9 perpendicular to the ground 8. Swivel joint 10 and hose 1
1, the hardening agent is supplied from the pump 3 to the swivel joint 10 via the hose 11 at the time of ground improvement work, and is further injected from the hardening agent injection nozzle via the rotary shaft 5. It has become. Some examples of the stirring body structure below the rotating shaft 5 of the stirring device in the ground improvement device include, as shown in FIGS. A plurality of stages of stirring blades, each of which includes a middle blade 13 and an outer blade 15 projecting at right angles to each other, are connected in series at a plurality of stages. Inner and outer shafts 12, 1
4, the rotational direction is different according to the forward / reverse rotation, or the middle blade 13 and the outer blade 15 adjacent to each other in a plurality of stages of the stirring blades are connected,
In accordance with the forward and reverse rotation of the inner and outer shafts 12 and 14, the rotation direction of the connected body A of the one connected middle wing 13 and the outer wing 15 and the rotation direction of the connected body of the other middle wing 13 and the outer wing 15 are different. What is constituted is mentioned. Internal and external dual rotation shaft 1 for stirring
The rotating members 2 and 14 are rotated in opposite directions as described above by a rotating mechanism 16 composed of, for example, a counter-rotating gear mechanism. According to the device, the co-rotation phenomenon and the formation of dumpling soil are prevented, and the shearing force, the excavation speed, the stirring and kneading effect, and the like are improved. In addition, as an example of a patent describing the ground improvement device, Japanese Patent Publication No. 3-40166, Japanese Patent Application Laid-Open No. 8-109
628 publication.

[0004] However, when deep excavation is to be performed using the ground improvement device, for example, when operation is required under an elevated line or when operation under a bridge is required, the above-described operation is performed. The length of the reader 4 may be limited, for example, because the overhead line in the direction is touched. Further, ground improvement at a depth greater than the length of the leader 4 may be required. In this case, it is difficult to make the rotary shaft 5 too long just because of the deep excavation from the viewpoint of transportation and the like, and the rotary shaft 5 has to be connected to a plurality of the appropriate lengths. In such a case, the ground improvement device having a stirring structure in which the rotating shaft for stirring as described above is configured as a double shaft of the inner shaft and the outer shaft, and the inner and outer double shafts are rotated in opposite directions, Even though the joint between the inner shafts is relatively easy, it is difficult to joint between the outer shafts.
Anyway, the rotating shaft is configured as a double shaft of the inner shaft and the outer shaft, and the inner and outer double shafts are rotated in opposite directions to take advantage of the ground improvement device that improves the stirring and kneading effect as described above. There is a problem that you can not.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique capable of solving the above technical problems.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a stirrer and a rotating mechanism in which a double inner and outer rotary shaft for stirring of a ground improvement device capable of excavating a hole in the ground to improve the ground has a rotating shaft in opposite directions to each other. Having a connecting portion capable of being connected to the outer shaft, being interposed between the inner shaft and the outer shaft, and capable of transmitting rotation to the outer shaft of the joined rotating shaft. A joint between a stirring device and a rotation mechanism of a ground improvement device, comprising: an outer shaft rotation transmitting member; and an elevating device for the member that can transfer the member in a joining direction and does not hinder rotation of the member. It concerns the device.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a configuration diagram including a splicing device according to an embodiment of the present invention. FIG. 1B is a perspective view of an outer shaft rotation transmitting member of the joining device. Further, FIG. 1C is a cross-sectional view taken along the line AA of FIG. FIG. 2 is an explanatory diagram of the rotation mechanism 19 side. FIG.
(A)-(C) is explanatory drawing of the operation example which shows each Example of this invention. It should be noted that the splicing device and the like shown in FIG. FIG. 4 is a perspective view of an elevating device for elevating the joining device. FIG. 5 is an explanatory diagram of a ground improvement device showing an embodiment of the present invention. FIG. 6 is a main part configuration diagram showing another embodiment of the present invention.

As shown in FIG. 5, a pulley device 18 for raising and lowering the auger 17 is provided above the leader 4 of the base machine 2 of the ground improvement device. The auger 17 is suspended along the leader 4 by the pulley device 18. The auger 17 contains a swivel joint, a drive motor, and the like. Also,
Inside the rotation mechanism 19 below the auger 17, for example, a contra-rotating gear mechanism or the like is housed. As shown in FIG. 5, the rotation mechanism 19 and the rotation shaft 20 are connected.
In the present embodiment, the rotating shaft 20 includes two rotating shafts 20.
An example in which A and 20B are connected vertically is shown,
It is also possible to connect three or more. Upper rotating shaft 20A
Is connected to the upper end of the lower rotating shaft 20B, and the upper end of the upper rotating shaft 20A is connected to the rotating mechanism 19 side.

As shown in FIG. 2, the stirring inner and outer dual rotating shafts 12 and 14 are rotated in opposite directions by a rotating mechanism 19 such as a contra-rotating gear mechanism. For example, the inner shaft 12 rotates right and the outer shaft 14 rotates left.

As shown in FIGS. 5 and 2, the rotating mechanism 19 and the rotating shaft 20 are connected by a splicing device (attachment) 21 according to the present invention. As shown in FIGS. 1A and 1C, the joining device 21 includes a middle rod portion 220 and an outer rod portion 230 which are connected to the inner shaft 22 at the upper end of the rotating shaft 20A as shown in FIG. Having. An outer shaft rotation transmitting member 24 as shown in FIG. 1B is interposed between the middle rod portion 220 and the outer rod portion 230. That is, as shown in the sectional view along the line AA in FIG. 1C, the outer rod portion 23 extends along the outer periphery of the middle rod portion 220.
The member 24 is interposed inside 0. At the lower part of the member 24, there is provided a connecting portion 25 necessary for connecting to the outer shaft 23 at the upper end of the rotating shaft 20A as shown in FIG.
The outer shaft 2 at the upper end of the rotating shaft 20A via the connecting portion 25
3, the rotation of the outer rod portion 230 is transmitted to the rotation shaft 20A, and in turn, to the rotation shaft 20B,
Further, the rotation is transmitted to the agitator 26 attached to the lower end of the rotating shaft 20B. The lower connecting portion 25 of the transmission member 24 is transferred in the joining direction (downward in the drawing) to be connected to the male joint 27 of the connecting portion 25 and the outer casing 28 of the rotary shaft 20A to be connected. By connecting the female joint 29 on the upper part of the outer shaft 23 with a pin or the like, a plurality of rotating shafts 20A, 20
Deep digging is possible by joining B. This can be achieved by lowering the length (X), for example, 830 mm, as shown in FIG.

The splicing device 21 will be described in further detail. As shown in FIG. 1 (A) and FIG.
Connecting portion 25 below outer shaft rotation transmitting member 24 of splicing device 21
Is connected to the end of the elevating device 30 of the member 24. As shown in FIG. 4, the end of the elevating device 30 is configured as a split joint 31, and the upper part of the connection portion 25 of the rotation transmitting member 24 is housed in the fastened split joint 31. In the upper part of the main body of the lifting device 30, FIG.
As shown in (A), an elevating cylinder 32 is provided, and as the elevating cylinder 32 descends, the rotation transmitting member 24 also descends. The rotation transmitting member 24 is rotatably housed inside the split joint 31 at the end of the lifting device 30 so that the rotation of the rotation transmitting member 24 is not hindered by the lifting device 30. The lifting cylinder 32 in the lifting device 30
3A is connected to a slide plate 33 as shown in FIG. 3A, and the slide plate 33 slides on a slide rail 34 provided in parallel with the reader 4.

An example of the operation of the present invention is as follows. First, from the state shown in FIG. 3A, as shown in FIG. 3B, the auger 17 is lowered by the pulley device 18 as shown in FIG. The male joint 35 and the female joint 36 at the upper end of the inner shaft 22 of the rotating shaft 20A are connected by a pin or the like. Next, or simultaneously, the elevating cylinder 32 is extended to transfer the lower portion of the outer shaft rotation transmitting member 24 downward, and the rotation transmitting member 24 is moved downward.
Male joint 27 of the lower connecting part 25 of FIG. 1 (A)
And the female joint 29 on the upper part of the outer shaft 23 inside the outer casing 28 of the rotary shaft 20A are connected by a pin or the like. At this time, the illustrated rod pin 37 is removed, and after the rotation transmitting member 24 is connected to the rotation shaft 20A, the rod pin 37 is set. Thus, by being connected to the rotating mechanism 19 side via the joining device 21, the rotation of the outer rod portion 230 is also transmitted to the outer shaft 23 of the joined rotating shaft 20A via the rotation transmitting member 24, and the ground improvement During the operation, the double reverse rotation of the rotation mechanism 19 causes the rotation shaft 20 to rotate.
A, the rotation shaft 20B, and the stirring device 26 are transmitted to the stirring device.

FIG. 6 is a structural view of a main part showing another embodiment of the present invention, in which a plurality of splicing devices 21 are used, and other than that, the structure is the same as that described above. By providing the plurality of joining devices 21 around the elevating device 30 as shown in the figure, the efficiency of excavation work and the like is remarkably improved.

[0016]

As described above, according to the present invention, in the case where deep excavation is to be performed using the ground improvement device, even if the length of the leader 4 is limited due to, for example, being below an elevated line. , A plurality of rotation shafts of appropriate length can be connected, and in this case, in particular, a rotation shaft for stirring is configured as a double shaft of an inner shaft and an outer shaft,
It can be suitably used in a ground improvement apparatus having a stirring structure in which the inner and outer dual shafts are rotated in opposite directions.
The present invention provides a stirring blade body including a middle blade 13 and an outer blade 15 projecting up and down in each axial direction of the inner and outer shafts 12 and 14 in a direction perpendicular to the shafts as shown in FIGS. The middle blade 13 and the outer blade 15 of each of the plurality of stages of stirrer blades are arranged in such a manner that the rotation directions of the inner blades 13 and the outer blades 15 are different with the forward / reverse rotation of the inner and outer shafts 12 and 14. Adjacent stepped middle blades 1 in individual stirring blade bodies connected in stages
3 and the outer wing 15, and a connected body A of one of the connected middle wings 13 and the outer wing 15 and the other middle wing 13 and the outer wing 15 due to forward and reverse rotation of the inner and outer shafts 12 and 14. Not only can it be applied to a soil improvement device that is configured to have a different rotation direction from the connecting body, but also a projecting device that projects vertically in the direction of each of the inner and outer shafts as shown in FIG. A plurality of stages of stirring blades composed of blades and outer blades are connected in series, and the rotation direction of the middle blade and the outer blade in each of the stirring blades connected in multiple stages is changed with forward and reverse rotation of the inner and outer shafts. The present invention can be applied to a different ground improvement device or the like.

[Brief description of the drawings]

FIG. 1A is a configuration diagram including a splicing device according to an embodiment of the present invention. FIG. 1B is a perspective view of an outer shaft rotation transmitting member of the joining device. Further, FIG. 1C is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is an explanatory diagram of a rotation mechanism 19 side.

FIGS. 3A to 3C are explanatory diagrams of operation examples showing an embodiment of the present invention, respectively.

FIG. 4 is a perspective view of an elevating device for elevating the joining device.

FIG. 5 is an explanatory diagram of a ground improvement device showing an embodiment of the present invention.

FIG. 6 is a main part configuration diagram showing another embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a stirring device used in the present invention.

FIG. 8 is a side view of a main part of the stirring device.

FIG. 9 is an explanatory diagram of a ground improvement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground improvement apparatus 2 Base machine 3 Hardening agent supply pump 4 Leader 5 Rotating shaft 6 Hydraulic motor 7 Drilling blade part 8 Ground 9 Drilling hole 10 Swivel joint 11 Hose 12 Inner shaft 13 Stirring rod (Middle wing) 14 Outer shaft 15 Stirrer blade Body (outer wing) 16 Double reversing gear mechanism 17 Auger 18 Pulley device 19 Rotating mechanism 20 Rotating shaft 21 Splicing device 22 Inner shaft 23 Double reversing gear mechanism 24 Rotation transmitting member 25 Connecting part 26 Stirrer 27 Joint 28 Outer casing 29 Joint 30 Elevating device 31 Split joint 32 Elevating cylinder 33 Slide plate 34 Slide rail 35 Joint 36 Joint 37 Rod pin 220 Middle rod 230 External rod A Connected body (rotation direction) B Connected body (rotation) direction)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-127048 (JP, A) JP-A-2-279817 (JP, A) JP-A-3-79331 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) E02D 3/12

Claims (1)

(57) [Claims] A stirrer and a rotating mechanism, wherein a double inner and outer rotary shaft for stirring of a ground improvement device capable of excavating a hole in the ground to improve the ground, wherein the rotation shafts rotate in mutually opposite directions, An outer shaft rotation transmitting member having a connecting portion capable of being connected to the outer shaft, being interposed between the inner shaft and the outer shaft, and capable of transmitting rotation to the outer shaft of the joined rotating shaft; A joining device for a stirring device and a rotation mechanism of a ground improvement device, comprising: a member elevating device that can transfer a member in a joining direction and does not hinder rotation of the member.