JP3924191B2 - Ground improvement device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground improvement device for excavating a digging groove and improving the ground in the digging groove.
[0002]
[Prior art]
Conventionally, as an example of a ground improvement device that excavates a drilling groove and improves the ground by injecting a ground improvement agent such as a solidifying agent into the excavated soil and stirring in the drilling groove, as shown in FIG. Two shafts 51, 51 that are rotatable around the vertical axis in opposite directions are supported by a base machine (not shown) installed on the ground, and installed at the lower ends of the two shafts 51, 51. There is a ground improvement device 50 that excavates the excavation groove 9 with the excavating blade 52 and agitates the excavated soil with the agitating blades 53 and 53 attached above the excavating blade 52. In this configuration, since the stirring blades 53 and 53 attached to the shafts 51 and 51 rotate around the vertical axis in opposite directions, the excavated sediment is efficiently stirred by the shear effect between the stirring blades 53 and 53. Can do.
[0003]
[Problems to be solved by the invention]
However, the conventional ground improvement device 50 has the following problems.
In order to rotate the two shafts 51, 51, a motor is installed for each shaft 51, 51, or the two shafts 51, 51 can be rotated by one motor 54 as shown in FIG. It is necessary to install the gear mechanism 55. At this time, since the rotational reaction force of the shafts 51 and 51 acts on the gear mechanism 55 or the motor (hereinafter referred to as “gear mechanism or the like”), it is necessary to firmly fix the gear mechanism 55 or the like. The gear mechanism 55 and the like are directly fixed to the base machine to ensure strength. As a result, the shafts 51 and 51 connecting the gear mechanism 55 and the excavating blade 52 become long. Therefore, by increasing the rigidity of the shafts 51 and 51, the stirring blade 53 and the excavating blade 52 at the time of construction are used. Is stabilized.
[0004]
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 and 51, and the weight of the highly rigid shafts 51 increases. There is a problem that it is necessary to increase the strength of the entire 50 and the manufacturing cost increases.
Further, when adding the shaft 51 corresponding to the depth of the excavation groove 9, it is necessary to firmly connect the shafts 51 and reduce the connection interval in order not to lower the rigidity of the shafts 51. There is a problem that the construction efficiency is reduced.
[0005]
Therefore, the present invention has been made to solve the above problems, and it is not necessary to increase the strength of the entire apparatus, and the configuration of the entire apparatus is simplified, so that the manufacturing cost can be reduced. An object of the present invention is to provide a ground improvement device that can increase the construction efficiency.
[0006]
[Means for Solving the Problems]
The present invention is configured to solve the above problems, and the invention according to claim 1 is capable of moving up and down along a base machine, a guide rail supported by the base machine, and the guide rail. A ground improvement device comprising a lifting device and a rotating means provided at a lower end portion of the lifting device, wherein the rotating means excavates a digging groove and improves the ground in the digging groove, A first hollow motor having one through hole, a hollow first rotating shaft connected to an output portion of the first hollow motor in the first through hole, a second hollow motor having a second through hole, In the 2nd through-hole, it has the hollow 2nd rotating shaft connected with the output part of the 2nd hollow motor, the 1st hollow motor and the 2nd hollow motor are arranged in the up-and-down direction, and the 1st The rotating shaft is inserted into the hollow portion of the second rotating shaft; and A first rotary shaft and the second rotation axis is characterized by being rotatable in opposite directions to each other.
[0007]
Here, the configuration of the base machine is not limited as long as it can reliably support the support shaft, such as a self-propelled type and a fixed type.
Further, the rotating means is an existing hollow motor having a through hole, and a driving method such as a hydraulic type or an electric type is not limited.
[0008]
According to the present invention, the rotation reaction force acting on the first hollow motor and the second hollow motor is canceled by rotating the first rotation shaft and the second rotation shaft in opposite directions at the concentric position. There is no need to firmly fix the motor, and each hollow motor can be easily installed at the lower end of the lifting device.
Also, by using a hollow motor, the rotational center of the output part of the motor and the rotational center of each shaft that excavates the excavation groove are located at the same position without installing a gear mechanism or the like, so that the rotational efficiency of each shaft Can be increased.
[0009]
Further, the invention described in claim 2 is the ground improvement device according to claim 1, wherein the first rotating shaft and the second rotating shaft are each provided with a stirring blade, and the first rotating shaft. Alternatively, a digging blade for digging a digging groove is attached to the lower end of the second rotating shaft.
[0010]
According to the present invention, when the agitating blade and the excavating blade are moved up and down by the lifting device, the hollow motors of the first rotating shaft and the second rotating shaft are also moved up and down in conjunction with each other. The distance from the hollow motor is always small, and the agitating blade and the excavating blade are stabilized 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.
[0011]
Therefore, in the ground improvement device of the present invention, the first rotation shaft and the second rotation shaft are arranged in concentric positions, and the rotation reaction force acting on the hollow motor of each shaft is generated by rotating the respective shafts in opposite directions. Since it can be reduced, it is not necessary to increase the strength of the entire apparatus, the structure of the apparatus is simplified, the manufacturing cost can be reduced, and the construction efficiency can be increased.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
In this embodiment, a case where a vertical excavation groove is excavated using the ground improvement device and the ground in the excavation groove is improved will be described as an example.
[0014]
FIG. 1 is a side view showing a ground improvement device according to an embodiment of the present invention. FIG. 2 is a cross-sectional side view showing a rotation driving 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.
[0015]
First, the configuration 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 that supports a guide rail 2 in the vertical direction, a lifting device 4 that can be lifted and lowered along the guide rail 2, and a lower end portion of the lifting device 4. The rotary drive unit (rotating unit) 10 is installed, and the rotary drive unit 10 excavates the excavation groove 9 and agitates the excavated soil in the excavation groove 9.
[0016]
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 means of the base machine 3, and a cab 7.
As shown in FIG. 1, the lifting device 4 is fixed to one end of a wire (not shown) suspended from a base machine 3 via a pulley 8 installed at the upper end of the guide rail 2. A drum (not shown) installed in the machine 3 winds or feeds the wire, so that the entire apparatus can be moved up and down along the guide rail 2 in the vertical direction.
[0017]
As shown in FIGS. 1 and 2, the rotation driving unit 10 includes a support shaft 11 having an upper end fixed to the lifting device 4, and vertical through holes 31 and 41. The upper hollow motor (first hollow motor) 30 and the lower hollow motor (second hollow motor) 40 arranged in the vertical direction at the lower end of the support shaft 11 so as to be concentric, and the output of the lower hollow motor 40 The hollow outer shaft 14 is pivotally supported by the portion 42, and the hollow inner shaft 13 is provided with the excavating blade 12 at the lower end portion and pivotally supported by the output portion 32 of the upper hollow motor 30. Agitating blades 15 and 16 are attached between the excavating blade 12 and the lower hollow motor 40 on the inner shaft 13 and the outer shaft 14.
[0018]
The support shaft 11 is a lightweight support whose upper end is fixed to the lifting device 4, and can be extended by connecting a plurality of support shafts 11 in the vertical direction. Since the support shaft 11 does not require high rigidity, the support shaft 11 can be easily connected and has a large connection interval.
The upper hollow motor 30 and the lower hollow motor 40 are hydraulic hollow motors having vertical through holes 31, 41, and output units 32, 42 installed at intermediate portions of the through holes 31, 41 are opposite to each other. It is configured to rotate around the vertical axis. Reference numerals 33 and 43 are bearings for rotatably supporting the shafts 13 and 14 inserted into the through holes 31 and 41.
[0019]
The outer shaft 14 is a hollow tube that is rotatable about a vertical axis by having an upper end portion supported by an output portion 42 of the lower hollow motor 40 via a bearing 43. The lower end portion 20 of the outer shaft 14 is divided at a predetermined interval, and is connected by outer stirring blades 16 and 16 attached to both sides of the outer shaft 14.
The inner shaft 13 is a hollow tube whose upper end portion is pivotally supported by the output portion 32 of the upper hollow motor 30 via a bearing 33 so that the inner shaft 13 can rotate in the opposite direction at a concentric position with the outer shaft 14. 14, a drilling blade 12 for excavating the excavation groove 9 is installed at the lower end, and exposed to the outside on both sides of the inner shaft 13 above the drilling blade 12. Inner stirring blades 15 are attached. The inner shaft 13 is provided with a hollow portion 17 communicating with a ground improvement agent supply device (not shown), and a lower end portion of the hollow portion 17 is provided with a discharge port 18. An inlet 19 is provided at the upper end.
[0020]
The outer stirring blade 16 has a configuration in which two blade pieces 22 and 22 are installed at predetermined intervals inside a pair of frames 21 formed in a substantially U-shape, and both end portions of the frame 21 are vertical. The lower end portion is attached to the lower end portion 20 of the outer shaft 14 and the upper end portion is attached to the main body of the outer shaft 14 so that the divided outer shaft 14 is connected to the frame. The wing pieces 22 and 22 are attached to the inside of the center portion in the vertical direction of 21.
The inner stirring blade 15 has a configuration in which one blade piece 24 is installed outside a pair of frames 23 formed in a substantially U shape, and both ends of the frame 23 are arranged in a vertical direction. It is attached to the inner shaft 13, and a wing part 24 is attached to the outside of the center part in the vertical direction of the frame 23. The width in the vertical direction of the inner stirring blade 15 is a size that fits within the distance 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 pieces 24 are positioned between the upper and lower blade pieces 22 and 22 installed inside the outer stirring blade 21 and are formed so that the blade pieces 22 and 24 are alternately arranged.
[0021]
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, the outer stirring blades arranged at the concentric positions outside the rotating inner stirring blades 15. Since 16 rotates in the opposite direction, the rotational reaction force acting on the upper hollow motor 30 and the lower hollow motor 40 is greatly reduced. Thereby, since it becomes unnecessary to fix the upper hollow motor 30 and the lower hollow motor 40 firmly, each hollow motor 30 and 40 is simply installed in the lower end part of the support shaft 11, and the support shaft 11 is moved 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 distance between the stirring blades 15 and 16 and the excavating blade 12 and the hollow motors 30 and 40 is always reduced, and it is not necessary to increase the rigidity of the inner shaft 13 and the outer shaft 14. 14 is reduced in weight. That is, since it is not necessary to increase the strength of the entire device 1, the configuration of the entire device 1 is simplified, and the manufacturing cost is reduced.
[0022]
Next, the ground improvement method using the ground improvement apparatus 1 which concerns on embodiment of this invention is demonstrated.
First, as shown in FIG. 1, the base machine 3 is moved to the side of a predetermined position where the ground improvement is performed, and the vertical guide rail 2 is installed. And the raising / lowering apparatus 4 is lowered | hung and the excavation blade 12 installed in the lower end part of the rotational drive part 10 is contact | abutted on the ground surface.
Further, the upper hollow motor 30 and the lower hollow motor 40 are driven to rotate the inner shaft 13 and the outer shaft 14, the ground is excavated by the excavating blade 12 installed at the lower end portion of the inner shaft 13, and excavated by the lifting device 4. The blade 12 is sequentially lowered to construct the excavation groove 9 having a predetermined depth. At this time, the distance between the hollow motors 30 and 40 and the excavation blade 12 is always small and constant, and the hollow motors 30 and 40 are driven down into the excavation groove 9 together with the excavation blade 12, so that the excavation blade 12 is stable. It will be in the state. Here, even if the lifting device 4 is lowered to the lower end of the guide rail 2, if the excavation blade 12 does not reach a predetermined depth, the support shaft 11 is added to lower the excavation blade 12. The support shaft 11 is reduced in weight by being reduced in rigidity, and is easily joined. Further, since the joining interval is large, the support shaft 11 can be easily added. Further, since the hollow motors 30 and 40 are installed at the lower end of the support shaft 11, even when the support shaft 11 is added, the distance between the hollow motors 30 and 40 and the excavation blade 12 is always kept small and constant. The excavating blade 12 is in a stable state.
[0023]
Next, after the excavation blade 12 reaches a predetermined depth, the ground improvement agent is injected into the excavation soil accumulated in the excavation groove 9 from the discharge port 18 of the inner shaft 13. And excavated earth and sand are efficiently stirred by the shear effect between each stirring blade 15 and 16 rotating in the mutually opposite direction.
Finally, the rotary drive unit 10 is lifted and lowered from the excavation groove 9 while the ground improver is injected and the excavated soil is agitated. Thereby, the excavated earth and sand in the excavation groove 9 is hardened by the ground improving agent, and the ground at a predetermined position is improved.
[0024]
Therefore, in the ground improvement apparatus 1 which concerns on embodiment of this invention, since the structure of the whole apparatus 1 is simplified, the construction efficiency of ground improvement is increasing.
[0025]
As mentioned above, although an example about the suitable embodiment of the present invention was explained, the present invention is not limited to the above-mentioned embodiment, and design change is possible suitably in the range which does not deviate from the meaning of the present invention.
For example, as shown in FIG. 3, an existing earth auger 3 ′ may be used in the base machine. In this configuration, an 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, and the agitator blades 25 and 16 and 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 equipment is diverted. Cost is greatly reduced.
[0026]
【The invention's effect】
According to the ground improvement device of the present invention, the rotation reaction force acting on the hollow motor of each shaft is canceled by rotating the first rotation shaft and the second rotation shaft in opposite directions at the concentric position. There is no need to firmly fix the motor, and the motor can be easily installed at the lower end of the support shaft.
Further, in the configuration in which the agitating blade and the excavating blade are installed on each rotating shaft, when the agitating blade and the excavating blade are raised and lowered, the hollow motor of each axis can be raised and lowered together with the agitating blade and the excavating blade. In addition, the distance between the excavating blade and the rotating means is always small, and the stirring blade and the excavating blade are stabilized 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 configuration of the apparatus can be simplified, the manufacturing cost can be reduced, and the construction efficiency can be increased. it can.
[Brief description of the 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 a ground improvement device according to an 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]
DESCRIPTION OF SYMBOLS 1 ... Ground improvement apparatus 2 ... Guide rail 3 ... Base machine 4 ... Lifting device 9 ... Excavation groove 10 ... Rotary drive part 11 ... Support Shaft 12 ... Excavation blade 13 ... Inner shaft 14 ... Outer shaft 15 ... Inner stirring blade 16 ... Outer stirring blade 30 ... Upper hollow motor 40 ...・ Lower hollow motor

Claims (2)

A base machine,
A guide rail supported by the base machine;
A lifting device that can be lifted and lowered along the guide rail;
Rotation means provided at the lower end of the lifting device,
A ground improvement device for excavating a trench by the rotating means and improving the ground in the trench,
The rotating means includes
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;
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;
The first hollow motor and the second hollow motor are arranged in a vertical direction,
The first rotating shaft is inserted into a hollow portion of the second rotating shaft, and the first rotating shaft and the second rotating shaft are configured to be rotatable in directions opposite to each other. Ground improvement device. A stirring blade is attached to each of the first rotating shaft and the second rotating shaft, and
The ground improvement device according to claim 1, wherein an excavation blade for excavating the excavation groove is attached to a lower end portion of the first rotation shaft or the second rotation shaft.

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