JP2021011759A - Ground improvement device comprising attachment - Google Patents

Abstract

To make a work of connecting an attachment to a rotation output shaft of a ground improvement machine easy.SOLUTION: A ground improvement device comprises an attachment 10 detachably attached to a ground improvement machine and excavating an underground. The ground improvement machine comprises: a leader; a driving device attached to the leader and capable of ascending/descending along a shaft line of the leader; and holding means 42 ascending/descending integrally with the driving device. The attachment 10 comprises a connection portion 26 provided at its one end and detachably connected to a rotation output shaft 27 driven to rotate by the driving device. The holding means 42 holds the connection portion 26 of the attachment at a vicinity of the rotation output shaft when connecting the attachment 10 to the rotation output shaft 27.SELECTED DRAWING: Figure 3

Description

The technique disclosed in the present specification relates to a ground improvement device including a ground improvement machine and an attachment detachably attached to the ground improvement machine.

Drilling holes may be formed in the ground to improve the ground. For example, a permeable pipe or the like is installed in the excavation hole, or crushed stone is filled to form a crushed stone column. A ground improvement device for forming an excavation hole is disclosed in, for example, Patent Document 1. The ground improvement device of Patent Document 1 includes a ground improvement machine and an attachment attached to the ground improvement machine. The ground improvement machine includes a leader and a drive device attached to the leader. The drive device can be raised and lowered along the axis of the reader. One end of the attachment is connected to a rotary output shaft that is rotationally driven by a drive. By rotating the attachment while lowering the drive device along the leader, the attachment is inserted into the ground while excavating the ground. As a result, an excavation hole is formed in the ground.

Japanese Unexamined Patent Publication No. 7-127044

In the ground improvement device, various attachments can be attached and detached according to the size of the excavation hole. When connecting the attachment to the ground improvement machine, first, as shown in FIG. 13, the drive device 72 is raised to the upper end of the reader 70. Next, the wire 78 is wound around the attachment 74, and the wire 78 is wound around the winch 76. As a result, the attachment 74 is pulled up. While pulling up the attachment 74, the connecting portion 75 of the attachment 74 is aligned with the rotation output shaft 73 of the drive device 72. At the same time as this alignment work, the connecting portion 75 is connected to the rotary output shaft 73 by interlocking the winding operation of the wire 78 and the lowering operation of the drive device 72. As a result, the attachment 74 is connected to the drive device 72. As is clear from the above description, in order to connect the attachment 74 to the ground improvement machine, the winding operation of the wire 78 and the lowering operation of the drive device 72 must be linked. Since the attachment 74 lifted by the wire 78 is not stable, the work of connecting the attachment 74 to the ground improvement machine has been a very difficult work.

The present specification discloses a technique for facilitating the work of connecting an attachment to a rotary output shaft of a ground improvement machine.

The present specification discloses a ground improvement device including a ground improvement machine and an attachment that is detachably attached to the ground improvement machine and excavates the ground. The ground improvement machine includes a leader, a drive device that is attached to the leader and can move up and down along the axis of the reader, and a holding means that can move up and down together with the drive device and hold an attachment. The attachment is provided at one end thereof and includes a connecting portion that is detachably connected to a rotary output shaft that is rotationally driven by a drive device. Then, when the attachment is connected to the rotation output shaft, the holding means holds the connecting portion of the attachment in the vicinity of the rotation output shaft.

This ground improvement device includes a holding means for holding the connecting portion of the attachment in the vicinity of the rotation output shaft, and the holding means moves up and down integrally with the drive device. Therefore, when connecting the attachment to the rotary output shaft, the attachment is pulled up by raising the drive device, and the connecting portion of the attachment is held in the vicinity of the rotary output shaft by the holding means. Since the connecting portion of the attachment can be positioned in the vicinity of the rotary output shaft only by raising and lowering the drive device, the work of connecting the attachment to the rotary output shaft of the ground improvement machine can be facilitated.

Further, the present specification discloses a suitable method for connecting the connecting portion of the attachment to the rotating output shaft of the driving device in the above-mentioned ground improvement device. In this method, in the first moving step of moving the drive device to the lower end side of the reader, and with the drive device moved to the lower end side of the reader, the connecting portion of the attachment is moved near the rotation output shaft by the holding means. The holding step of holding the attachment, the second moving step of moving the drive device to the upper end side of the reader while holding the connecting portion of the attachment in the vicinity of the rotation output shaft, and the connecting portion of the attachment after the second moving step. It is provided with a connecting step of connecting the above to the rotary output shaft. By executing such a method, in the above-mentioned ground improvement device, the connecting portion of the attachment can be easily connected to the rotating output shaft of the driving device.

When the ground improvement machine further includes a driver's seat arranged behind the leader, the second moving step may be performed with the upper end of the leader tilted toward the driver's seat. When the second moving step is performed in this way, the attachment is pulled upward while the lower end of the attachment is in contact with the ground and the attachment is tilted toward the driver's seat, so that the posture of the attachment is more stable. .. Therefore, the connecting portion of the attachment can be easily positioned closer to the rotation output shaft.

It is a side view which shows the schematic structure of the ground improvement apparatus which concerns on an Example, and shows the state which the attachment for forming a crushed stone pile is attached. The figure which shows the schematic structure of the attachment for forming a crushed stone pile which concerns on Example. It is a partially enlarged view of the ground improvement device which concerns on embodiment, and is the figure which looked at the rotation input shaft, the motor output shaft, and the holding mechanism from the front. It is a partially enlarged view of the ground improvement apparatus which concerns on embodiment, and is the figure which looked at the rotation input shaft, the motor output shaft, and the holding mechanism from the side. The figure for demonstrating the positional relationship between the chain attachment part (through hole) on the attachment side, and the chain attachment part (through hole) on the holding mechanism side. The figure for demonstrating the outline of the procedure of connecting the rotation input shaft of an attachment to the motor output shaft of a drive device. The figure which shows one procedure when positioning the rotation input shaft of an attachment with respect to the motor output shaft of a drive device (when the attachment and the reader are positioned while keeping parallel state). The figure which shows one other procedure when positioning the rotation input shaft of an attachment with respect to the motor output shaft of a drive device (when the attachment and the reader are not kept parallel). The figure for demonstrating the influence by the position of the chain attachment part (through hole) on the holding mechanism side. The figure which shows an example of the chain length adjustment mechanism for adjusting the length of a chain. The figure which shows another example of the chain length adjustment mechanism for adjusting the length of a chain. It is a partially enlarged view of the ground improvement device which concerns on the modification, and is the figure which looked at the rotation input shaft, the motor output shaft, and the holding mechanism from the front. The figure for demonstrating the state at the time of connecting the connecting part of the attachment to the rotary output shaft of a drive device in the conventional ground improvement apparatus.

The main features of the examples described below are listed. It should be noted that the technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Feature 1) In the ground improvement device disclosed in the present specification, the holding means is a frame attached to a drive device, one end of which is attached to the frame, and the other end is detachably attached to the attachment. It may be provided with one or more wire-like members for lifting. According to such a configuration, the connecting portion of the attachment can be held in the vicinity of the rotation output shaft with a simple configuration of a frame and a wire-shaped member (for example, a wire, a chain, etc.).

(Feature 2) In the ground improvement device disclosed in the present specification, the attachment is provided with an attachment-side attachment portion provided in the vicinity of the connecting portion, and the other end of the wire-shaped member can be attached to and detached from the attachment-side attachment portion. It may be attached to. Further, the frame may be provided with a frame-side mounting portion to which one end of the wire-shaped member is mounted. According to such a configuration, the attachment can be freely rotationally driven by removing the wire-shaped member from the attachment side attachment portion after connecting the attachment to the drive device. The distance from the axis of the rotary output shaft to the frame-side mounting portion may be longer than the radius from the axis of the attachment to the outer peripheral surface.

(Feature 3) In the ground improvement device disclosed in the present specification, a recess into which a connecting portion is inserted may be formed on the lower end surface of the rotary output shaft. The rotation output shaft and the attachment may be connected by inserting the connecting portion of the attachment into the recess. The position of the frame-side mounting portion in the height direction may be set in the vicinity of the position in the height direction of the lower end surface of the rotation output shaft. According to such a configuration, the end of the wire-shaped member on the frame side is close to the height of the lower end surface of the rotation output shaft, so that the length of the wire-shaped member can be shortened. This makes it easier to insert the connecting portion of the attachment into the recess of the rotary output shaft.

(Feature 4) In the ground improvement device disclosed in the present specification, the axis of the rotation output shaft extends in the vertical direction, the axis of the rotation output shaft and the axis of the attachment coincide with each other, and the lower end surface of the rotation output shaft. When the ground improvement machine and the attachment are viewed from the side with the height of the above and the height of the upper end surface of the attachment connecting part being the same, the straight line connecting the attachment side mounting part and the frame side mounting part and the axis of the rotary output shaft The angle between the two may be in the range of 30 to 80 °. According to such a configuration, the wire-shaped member can have an appropriate length, and the connecting portion of the attachment can be easily connected to the rotary output shaft.

(Feature 5) The ground improvement device disclosed in the present specification may further include a length adjusting mechanism for adjusting the length of the wire-shaped member attached to the attachment side mounting portion and the frame side mounting portion. According to such a configuration, the length of the wire-shaped member can be adjusted so that the connecting portion of the attachment and the rotary output shaft can be easily connected.

(Feature 6) In the ground improvement device disclosed in the present specification, the frame-side mounting portion may be provided with a plurality of mounting holes to which one end of a wire-shaped member is mounted. The length adjusting mechanism may adjust the length of the wire-shaped member by selecting any one of the plurality of mounting holes. According to such a configuration, the length of the wire-shaped member can be adjusted with a simple configuration.

(Feature 7) In the ground improvement device disclosed in the present specification, the frame may include a main body frame and a moving frame movably attached to the main body frame. The frame-side mounting portion may be formed on the moving frame. The length adjusting mechanism may adjust the length of the wire-shaped member by adjusting the position of the moving frame with respect to the main body frame. According to such a configuration, the length of the wire-shaped member can be easily finely adjusted.

(Feature 8) In the ground improvement device disclosed in the present specification, the attachments are a first attachment side attachment portion provided in the vicinity of the connecting portion and a second attachment side attachment portion provided in the vicinity of the connecting portion. And may be provided. The holding means includes a first wire-like member whose other end is detachably attached to the first attachment side attachment portion and a second wire-like member whose other end is detachably attached to the second attachment side attachment portion. And may be provided. The frame may include a first frame-side mounting portion to which one end of the first wire-shaped member is mounted, and a second frame-side mounting portion to which one end of the second wire-shaped member is mounted. According to such a configuration, since the attachment is lifted by the two wire-shaped members, the posture of the attachment can be stabilized.

(Feature 9) In the ground improvement device disclosed in the present specification, when the ground improvement machine and the attachment are viewed from the front with the attachment connected to the rotation output shaft, the first attachment side attachment portion and the second attachment side attachment are attached. The first frame-side mounting portion and the second frame-side mounting portion, and the first wire-shaped member and the second wire-shaped member are arranged symmetrically with respect to the axis of the rotation output shaft. You may. According to such a configuration, the posture when the attachment is lifted can be stabilized.

(Feature 10) In the ground improvement device disclosed in the present specification, the frame may include a first portion attached to the drive device and a second portion extending downward from the first portion. One end of the wire-shaped member may be attached to the second portion. According to such a configuration, the position of one end (end on the frame side) of the wire-shaped member can be provided below the drive device. Therefore, the connecting portion of the attachment and the rotary output shaft can be easily connected.

(Feature 11) In the ground improvement device disclosed in the present specification, the wire-shaped member may be a metal wire, a metal chain, a band for hanging loads, or the like.

Hereinafter, the ground improvement device according to the embodiment will be described. As shown in FIG. 1, the ground improvement device 100 includes a ground improvement machine 40 and an attachment 10 for forming a crushed stone pile mounted on the ground improvement machine 40. As shown in FIG. 1, the ground improvement machine 40 includes a ground improvement machine main body structure 1, a cabin 7 as a driver's seat, a crawler 6 which is an endless track capable of moving on rough terrain with low ground pressure, and a construction time. The outrigger 5 that suppresses the swing of the ground improvement machine 40 is provided.

The ground improvement machine 40 further includes a configuration for operating the attachment 10. That is, the ground improvement machine 40 moves up and down together with the drive device 11 that supplies the rotation drive force to the attachment 10 via the motor output shaft 27 (an example of the rotation output shaft), and also moves the attachment 10. A reader 4 having a holding mechanism 42 (an example of holding means (not shown in FIG. 1 but shown in FIGS. 3 to 5)), a lifting guide rail 9 for guiding the lifting operation of the drive device 11, and a leader 4 for holding. It is provided with a leader mounting base 2 for supporting the leader 4, a hydraulic cylinder 3 for controlling the inclination of the leader 4, and an extension pedestal 8 integrally formed with the leader 4 at the lower end of the leader 4. There is.

The attachment 10 includes a cylindrical portion 12 provided with fins 13, a spiral portion 14, a surrounding frame 30 for holding the cylindrical portion 12, a top cover case 16 attached to the upper end of the cylindrical portion 12, and a crushed stone throwing device. 32, a mounting plate 37 for supporting the surrounding frame 30, a support arm 39 for supporting the crushed stone throwing device 32, and a construction management device 41 for managing the construction state by the attachment 10.

A crushed stone input hole 15 is formed in the cylindrical portion 12, and the crushed stone input hole 15 is closed by an opening / closing lid 20. The crushed stone throwing device 32 includes a hopper portion 33 and a chute portion 34 arranged below the hopper portion 33. The crushed stone input hole 15 is closed by the opening / closing lid 20 when the attachment 10 excavates the ground. As a result, it is possible to prevent earth and sand from entering through the crushed stone input hole 15. Further, when the crushed stone is put into the cylindrical portion 12, the opening / closing lid 20 is opened. As a result, the crushed stone charged into the crushed stone charging device 32 can be charged into the cylindrical portion 12 through the crushed stone charging hole 15. The commonly used crushed stone is not a fixed shape because it is crushed rock, and has a diameter of about 2 to 50 mm, but is not limited to this. The crushed stone may include one having a diameter smaller than 2 mm, or may include one having a diameter larger than 50 mm. By changing the shape of the attachment, it is possible to handle objects with a diameter larger than 50 mm.

The spiral portion 14 is connected to the rotation input shaft 26 (an example of the connecting portion) via a core rod (not shown). The rotary input shaft 26 is detachably connected to the motor output shaft 27 of the drive device 11. The rotation input shaft 26 rotates according to the rotation driving force of the motor output shaft 27, and transmits the rotation driving force to the spiral portion 14. An excavation blade is provided at the tip of the spiral portion 14. The excavation blade is formed in a spiral shape in which the diameter increases toward the tip of the spiral portion 14. Almost the entire excavation blade is arranged in the cylindrical portion 12, and only a part of the tip of the excavation blade protrudes from the tip of the cylindrical portion 12.

Spiral fins 13 are formed around the cylindrical portion 12. The fin 13 has a spiral shape in the same direction as the spiral of the spiral portion 14 (that is, the excavation blade). As will be described later, when the attachment 10 excavates the ground, the cylindrical portion 12 and the spiral portion 14 rotate in the same direction. As a result, the excavated earth and sand generated by the excavation of the spiral portion 14 is carried upward by the fins 13.

A one-way clutch mechanism (not shown) is provided inside the top cover case 16. The one-way clutch mechanism automatically puts the spiral portion 14 and the cylindrical portion 12 into an operating state in which the spiral portion 14 and the cylindrical portion 12 rotate together when driven in the rotational direction during excavation. On the other hand, in the rotational drive in the direction opposite to the rotational direction during excavation, the one-way clutch mechanism transmits the rotational driving force of the driving device 11 to the spiral portion 14, while the rotational driving force of the driving device 11 is transmitted to the cylindrical portion 12. Is not transmitted. As a result, the spiral portion 14 applies pressure to the crushed stone, while the cylindrical portion 12 stops rotating. Hereinafter, the direction in which the cylindrical portion 12 and the spiral portion 14 rotate in the same direction, that is, the rotation direction during excavation is referred to as a "forward rotation direction", and the direction in which the cylindrical portion 12 and the spiral portion 14 rotate in the direction opposite to the rotation direction during excavation, that is, the spiral portion. The direction of rotation in which pressure is applied to the crushed stone at 14 is sometimes referred to as the "reversal direction".

Here, a procedure for forming a crushed stone pile in the ground using the attachment 10 will be briefly described. First, the drive device 11 lowers the attachment 10 while rotating it in the forward rotation direction. As a result, the attachment 10 is inserted into the ground and excavated in the ground. The earth and sand discharged by excavation is carried to the outer circumference of the cylindrical portion 12 and is carried upward by the fins 13. When the attachment 10 reaches a predetermined depth, the driving of the forward rotation of the driving device 11 is stopped, and the excavation is completed. Next, with the opening / closing lid 20 open, crushed stone is charged into the crushed stone loading device 32. The crushed stone thrown into the crushed stone throwing device 32 is thrown into the cylindrical portion 12 through the crushed stone throwing hole 15. Next, the drive device 11 is driven so that the spiral portion 14 rotates in the reverse direction. Then, the attachment 10 rises while rotating in the reverse direction, and discharges the crushed stone thrown into the cylindrical portion 12 while pressing it from the spiral portion 14. As a result, a crushed stone pile is formed in the ground, and the attachment 10 is pushed out from the ground.

Next, the holding mechanism 42 will be described. The holding mechanism 42 has a function of holding the rotary input shaft 26 in the vicinity of the motor output shaft 27 when the rotary input shaft 26 of the attachment 10 is connected to the motor output shaft 27. That is, as shown in FIGS. 3 and 4, a fitting hole 27a is formed on the lower end surface of the motor output shaft 27. The rotation input shaft 26 is inserted into the fitting hole 27a, and the rotation input shaft 26 is coupled to the motor output shaft 27 by a connecting pin (not shown), whereby the motor output shaft 27 and the attachment 10 are connected. Therefore, in order to connect the rotary input shaft 26 and the motor output shaft 27, it is necessary to align the rotary input shaft 26 with respect to the motor output shaft 27. The holding mechanism 42 holds the rotary input shaft 26 in the vicinity of the motor output shaft 27 when the rotary input shaft 26 is connected (that is, aligned) with the motor output shaft 27.

As shown in FIGS. 3 and 4, the holding mechanism 42 includes a frame (44,46) and two hanging chains 50a, 50b for connecting the attachment 10 to the frame (44,46). Since the frames (44, 46) are attached to the housing (not shown) that supports the drive device 11, when the drive device 11 moves up and down along the elevating guide rail 9 of the reader 4, the holding mechanism 42 also moves along the axis of the reader 4. Ascend and descend along.

The frames (44, 46) include a horizontal frame 44 attached to a housing that supports the drive device 11, and vertical frames 46a, 46b extending downward from the horizontal frame 44. In the present specification, when the vertical frame 46a and the vertical frame 46b are distinguished, they are described separately by using the subscripts a and b, but when it is not particularly necessary to distinguish them, they are simply referred to as the vertical frame 46 without using the subscript. (The same applies to the subscripts of other components (for example, hanging chains 50a and 50b)). In this embodiment, the horizontal frame 44 and the vertical frames 46a and 46b are formed separately, but these may be integrally formed.

As is clear from FIGS. 3 and 4, the horizontal frame 44 is arranged at a position slightly above the lower end surface of the motor output shaft 27. The horizontal frame 44 is provided in a portion extending in the front-rear direction (hereinafter, simply referred to as the front-rear direction) of the ground improvement machine 40 (the portion shown in FIG. 4) and in the width direction of the ground improvement machine 40 (hereinafter, simply referred to as the width direction). It has an extending portion (the portion shown in FIG. 3). When the horizontal frame 44 is viewed from the front (that is, as shown in FIG. 3), the portion extending in the width direction of the horizontal frame 44 is arranged symmetrically with respect to the axis A, and both ends thereof are attached to the attachment 10. It is located outside the outer peripheral surface. Further, when the horizontal frame 44 is viewed from the side (that is, when viewed as shown in FIG. 4), the tip thereof is located outside the outer peripheral surface of the attachment 10. That is, the tip of the portion extending in the front-rear direction of the horizontal frame 44 is arranged on the front side of the ground improvement machine 40 with respect to the outer peripheral surface of the attachment 10. The tips of the portions extending in the front-rear direction of the horizontal frame 44 are connected to both ends of the portions extending in the width direction of the horizontal frame 44. That is, the portions extending in the front-rear direction of the two horizontal frames 44 are arranged at intervals in the width direction, and the attachment 10 is arranged between them. Therefore, the horizontal frame 44 is arranged so as to surround the axis A of the rotation input shaft 26. The base end of the portion extending in the front-rear direction of the horizontal frame 44 is attached to a housing (not shown) that supports the drive device 11.

The vertical frames 46a and 46b are arranged at both ends of the portion extending in the width direction of the horizontal frame 44 (that is, the tip of the portion extending in the front-rear direction of the horizontal frame 44). Therefore, the two vertical frames 46a and 46b are arranged at intervals in the width direction, and the attachment 10 is located between them. Further, the vertical frames 46a and 46b are arranged on the front side of the ground improvement machine 40 in the front-rear direction with respect to the attachment 10. When the horizontal frame 44 is viewed from the front, the portion extending in the width direction of the horizontal frame 44 is arranged symmetrically with respect to the axis A, so that the two vertical frames 46a and 46b are also arranged symmetrically with respect to the axis A. Further, since both ends of the portion extending in the width direction of the horizontal frame 44 are arranged outside the outer peripheral surface of the attachment 10, the vertical frames 46a and 46b are also arranged outside the outer peripheral surface of the attachment 10, and the motor output shaft 27 The distance from the axis A of the (rotational input shaft 26) to the vertical frames 46a and 46b is longer than the radius from the axis of the attachment 10 to the outer peripheral surface.

A through hole 48a (an example of a first frame-side mounting portion) that penetrates the vertical frame 46a in the width direction is formed at the lower end of the vertical frame 46a. At the lower end of the vertical frame 46b, a through hole 48b (an example of a second frame-side mounting portion) that penetrates the vertical frame 46b in the width direction is formed. One end of the suspension chain 50a (an example of the first suspension chain) is connected to the through hole 48a, and one end of the suspension chain 50b (an example of the second suspension chain) is connected to the through hole 48b. .. The vertical position (that is, the height direction) of the through hole 48a is the same as the vertical position of the through hole 48b, and is substantially the same as the position of the lower end surface of the motor output shaft 27. The hanging chains 50a and 50b may be detachably attached to the through holes 48a and 48b, or may be detachably attached to the through holes 48a and 48b.

The hanging chains 50a and 50b are metal chains used for lifting the attachment 10. That is, the other ends of the hanging chains 50a and 50b are connected to the attachment 10. Since one end of the hanging chains 50a, 50b is connected to the vertical frames 46a, 46b, the attachment 10 is connected to the frame (44, 46) by the hanging chains 50a, 50b. Therefore, when the drive device 11 rises along the elevating guide rail 9 of the leader 4 and the frames (44, 46) also rise, the attachment 10 is lifted in the air. When the attachment 10 is lifted, the rotation input shaft 26 of the attachment 10 is positioned in the vicinity of the motor output shaft 27 by the hanging chains 50a and 50b. As will be described in detail later, in this embodiment, the lengths of the suspension chains 50a and 50b are set when the upper end surface of the rotary input shaft 26 and the lower end surface of the motor output shaft 27 coincide with each other (that is, the rotary input shaft 26). The rotation input shaft 26 is set to be positioned at a position where it can be inserted into the fitting hole 27a at the moment when the motor is inserted into the fitting hole 27a (state shown in FIG. 5). Specifically, the size of the fitting hole 27a is slightly larger than the size of the rotary input shaft 26. Therefore, at the moment when the rotation input shaft 26 is inserted into the fitting hole 27a, the rotation input shaft 26 is suspended so that the upper end surface of the rotation input shaft 26 is positioned inside the fitting hole 27a. The lengths of the chains 50a and 50b are set. This makes it possible to easily connect the rotary input shaft 26 and the motor output shaft 27.

First, the connection structure between the other ends of the hanging chains 50a and 50b and the attachment 10 will be described. As shown in FIGS. 3 and 4, two projecting pieces 28a and 28b are provided on the upper end surface of the attachment 10. The two protruding pieces 28a and 28b are arranged at positions adjacent to the rotation input shaft 26 and symmetrical with respect to the axis A of the rotation input shaft 26. Through holes 29a and 29b that penetrate the projecting pieces 28a and 28b in the front-rear direction are formed in the projecting pieces 28a and 28b, respectively. The other end of the hanging chain 50a is detachably attached to the through hole 29a (that is, an example of the first attachment side attachment portion), and the through hole 29b (that is, an example of the second attachment side attachment portion) is attached. The other end of the hanging chain 50b is detachably attached. As described above, when the horizontal frame 44 is viewed from the front (as shown in FIG. 3), the two vertical frames 46a and 46b are arranged symmetrically with respect to the axis A, and the two projecting pieces 28a, 28b is arranged symmetrically with respect to the axis A. Therefore, the hanging chains 50a and 50b are also arranged symmetrically with respect to the axis A. As a result, when the state in which the attachment 10 is connected to the vertical frames 46a and 46b by the hanging chains 50a and 50b is viewed from the front (as shown in FIG. 3), the attachment 10 and the motor output shaft 27 are connected to the horizontal frame 44. It will be located in the center of. As the structure for attaching and detaching the hanging chains 50a and 50b to the through holes 29a and 29b, various known structures can be adopted. For example, a hook body provided at the other end of the hanging chain and a hook body provided at the other end of the hanging chain. It can be configured by a stopper that closes the opening of the hook body.

As described above, in the present embodiment, the lengths of the suspension chains 50a and 50b are the lengths of the motor output shaft 27 in a plan view when the upper end surface of the rotary input shaft 26 and the lower end surface of the motor output shaft 27 coincide with each other. The upper end surface of the rotation input shaft 26 is set to be located inside the fitting hole 27a. That is, at the moment when the rotation input shaft 26 is inserted into the fitting hole 27a of the motor output shaft 27 (specifically, the upper end surface of the rotation input shaft 26 coincides with the lower end surface of the motor output shaft 27, and the rotation input shaft The distance from the through hole 48 to the through hole 29 (when the upper end surface of 26 is positioned inside the fitting hole 27a of the motor output shaft 27) can be calculated from the respective dimensions of the holding mechanism 42 and the attachment 10. .. Therefore, by setting the length of the suspension chain 50 to be the same as the calculated distance, when the upper end surface of the rotation input shaft 26 matches the lower end surface of the motor output shaft 27, the rotation input shaft 26 The upper end surface of the motor output shaft 27 can be positioned inside the fitting hole 27a of the motor output shaft 27. Therefore, the rotary input shaft 26 can be easily inserted into the fitting hole 27a of the motor output shaft 27.

Next, a procedure for connecting the rotary input shaft 26 to the motor output shaft 27 will be described with reference to FIG. First, as shown in FIG. 6A, the vertical frame 46 and the attachment 10 are connected by the hanging chains 50a and 50b. That is, one end of the hanging chains 50a and 50b is connected to the through holes 48a and 48b of the vertical frames 46a and 46b, and the other end of the hanging chains 50a and 50b is connected to the through holes 29a and 29b of the protruding pieces 28a and 28b. ..
Next, as shown in FIG. 6B, the drive device 11 is raised along the elevating guide rail 9 of the leader 4. As a result, the attachment 10 is lifted while the tip of the attachment 10 is in contact with the ground. When lifting the attachment 10, for example, as shown in FIG. 6C, the reader 4 may be tilted toward the cabin 7. By tilting the leader 4 toward the cabin 7, the direction in which the attachment 10 is tilted becomes a constant direction (cabin side), and the posture of the attachment 10 at the time of lifting is stabilized.
Next, as shown in FIG. 6D, the upper end surface of the rotary input shaft 26 and the motor output shaft are adjusted by adjusting the tilting operation of the reader 4 and the raising / lowering operation of the drive device 11 in the state where the attachment 10 is lifted. Align with the lower end surface of 27. Then, the rotation input shaft 26 is positioned at a position where it can be inserted into the fitting hole 27a of the motor output shaft 27. Next, the drive device 11 is lowered, and the rotary input shaft 26 is inserted into the fitting hole 27a of the motor output shaft 27. When the rotary input shaft 26 is inserted into the fitting hole 27a, the rotary input shaft 26 and the motor output shaft 27 are connected by a connecting pin (not shown), and the connection between the drive device 11 and the attachment 10 is completed. When the connection between the drive device 11 and the attachment 10 is completed, the other ends of the suspension chains 50a and 50b are removed from the through holes 29a and 29b of the protruding pieces 28a and 28b. This allows the attachment 10 to rotate about its axis.

The operation of the ground improvement device 100 when aligning the motor output shaft 27 and the rotation input shaft 26 will be described in detail with reference to FIGS. 7 and 8. In the example shown in FIG. 7, the reader 4 and the attachment 10 are aligned while being maintained in parallel. First, as shown in FIG. 7A, the holding mechanism 42 is raised along the elevating guide rail of the leader 4, and the attachment 10 is lifted until the tip of the attachment 10 is separated from the ground. As a result, the attachment 10 is completely lifted from the ground, and the attachment 10 is lifted. At the position of the vertical frame 46, it is orthogonal to the ground. At this time, the leader 4 is also in a state orthogonal to the ground.
Next, as shown in FIG. 7B, the holding mechanism 42 is lowered to bring the tip of the attachment 10 into contact with the ground. Next, the holding mechanism 42 is further lowered while tilting the leader 4 toward the cabin 7. Since the holding mechanism 42 is lowered while tilting the leader 4 toward the cabin 7, the direction in which the attachment 10 is tilted can also be set to the cabin 7 side. As a result, the posture of the attachment 10 can be stabilized. By linking the lowering motion of the holding mechanism 42 and the tilting motion of the reader 4, the reader 4 and the attachment 10 can be maintained in a parallel state.
By lowering the holding mechanism 42 while adjusting the position of the ground improvement machine 40 in the front-rear direction while the leader 4 is tilted, the upper end surface of the rotary input shaft 26 and the lower end surface of the motor output shaft 27 are aligned ( The state shown in FIG. 7 (d)). In this state, the upper end surface of the rotary input shaft 26 is located directly below the lower end surface of the motor output shaft 27. That is, in this embodiment, since the length of the fishing chain 50 is set as described above, when the upper end surface of the rotary input shaft 26 and the lower end surface of the motor output shaft 27 are matched, the motor output shaft 27 The rotary input shaft 26 is aligned in a plane with respect to the motor output shaft 26, and the upper end surface of the rotary input shaft 26 is located inside the fitting hole 27a of the motor output shaft 27.
Next, as shown in FIG. 7E, the holding mechanism 42 is further lowered along the elevating guide rail 9. As a result, the rotary input shaft 26 is inserted into the fitting hole 27a of the motor output shaft 27, and the motor output shaft 27 and the rotary input shaft 26 are connected to each other. Then, as shown in FIG. 7 (f), the hanging chain 50 is separated from the attachment 10, and the attachment 10 can rotate around its axis.

In the example shown in FIG. 7, the rotation input shaft 26 is aligned with the motor output shaft 27 while maintaining the state in which the reader 4 and the attachment 10 are parallel, but the present invention is not limited to such an example. For example, as shown in FIG. 8, when the rotation input shaft 26 is aligned with the motor output shaft 27, the reader 4 and the attachment 10 do not have to be kept parallel. That is, even in the example shown in FIG. 8, after the attachment 10 is lifted (after the state shown in FIG. 8A), the holding mechanism 42 is lowered to bring the tip of the attachment 10 into contact with the ground (FIG. 8 (FIG. 8). The state shown in b)). After that, the holding mechanism 42 is lowered while tilting the leader 4. At that time, the attachment 10 may be tilted more with respect to the tilt of the reader 4 from the state in which the reader 4 and the attachment 10 are parallel (the state shown in FIG. 8C) (FIG. 8D). State shown in). Even in such a case, by lowering the holding mechanism 42 while adjusting the position in the front-rear direction of the ground improvement machine 40 and / or the tilt angle of the reader 4, the upper end surface of the rotation input shaft 26 and the motor output shaft Align with the lower end surface of 27. Then, the rotary input shaft 26 is aligned in a plane with respect to the motor output shaft 27, and the upper end surface of the rotary input shaft 26 is located inside the fitting hole 27a of the motor output shaft 27 (that is, the position where it can be inserted). It is matched (state shown in FIG. 8 (e))). Therefore, the rotation input shaft 26 can be inserted into the fitting hole 27a of the motor output shaft 27 simply by further lowering the holding mechanism 42 (state shown in FIG. 8F).

As described above, in the present embodiment, when the upper end surface of the rotary input shaft 26 and the lower end surface of the motor output shaft 27 are made to coincide with each other by setting the lengths of the suspension chains 50a and 50b to appropriate lengths. The rotation input shaft 26 is positioned so that it can be inserted into the fitting hole 27a. Therefore, the motor output shaft 27 and the rotation input shaft 26 can be easily connected only by lowering the holding mechanism 42 (driving device 11) from this state. This makes it possible to facilitate the work of connecting the rotation input shaft 26 of the attachment 10 to the motor output shaft 27 of the ground improvement machine 40.

Further, in this embodiment, the axis of the motor output shaft 27 extends in the vertical direction, the axis of the motor output shaft 27 and the axis of the attachment 10 coincide with each other, and the height and rotation of the lower end surface of the motor output shaft 27. When the ground improvement machine 40 and the attachment 10 are viewed from the side (that is, when viewed as shown in FIG. 5) with the heights of the upper end surfaces of the input shaft 26 being the same, the through hole 29 on the attachment 10 side The angle θ formed by the straight line l connecting the through holes 48 on the frame (44, 46) side and the axis A of the motor output shaft 27 is adjusted to be within the range of 30 to 80 °. By setting the position of the through hole 48 so that the angle θ is 30 ° or more, even if a dimensional error occurs in the holding mechanism 42 and the hanging chains 50a and 50b, the attachment 10 is placed inside the fitting hole 27a. The rotary input shaft 26 can be positioned.

That is, when the angle θ is smaller than 30 ° (for example, in the state shown in FIG. 9B), if a dimensional error occurs in the holding mechanism 42 or the hanging chains 50a and 50b, the upper end surface of the rotary input shaft 26 and the motor The position of the rotary input shaft 26 when aligned with the lower end surface of the output shaft 27 is largely displaced in the horizontal direction with respect to the fitting hole 27a of the motor output shaft 27. As a result, the rotary input shaft 26 cannot be positioned directly below the motor output shaft 27, and it becomes difficult to insert the rotary input shaft 26 into the fitting hole 27a. On the other hand, when the angle θ is larger than 30 ° (for example, in the state shown in FIG. 9A), if a dimensional error occurs in the holding mechanism 42 or the hanging chains 50a and 50b, the upper end surface of the rotary input shaft 26 and the motor The position of the rotary input shaft 26 when aligned with the lower end surface of the output shaft 27 is largely displaced in the vertical direction with respect to the fitting hole 27a of the motor output shaft 27, and is not significantly displaced in the horizontal direction. Therefore, the rotary input shaft 26 can be positioned directly under the motor output shaft 27, and the work of connecting the rotary input shaft 26 to the motor output shaft 27 can be facilitated.

When the angle θ is larger than 80 ° (for example, 90 °) (when the vertical position of the through hole 48 coincides with the vertical position of the through hole 29), the length of the suspension chain 50 has a margin. Therefore, the rotary input shaft 26 cannot be inserted into the fitting hole 27a of the motor output shaft 27. Therefore, by adjusting the position of the through hole 48 so that the angle θ is smaller than 80 °, the rotation input shaft 26 can be inserted into the fitting hole 27a of the motor output shaft 27.

In the above-described embodiment, one through hole 48 is formed in the vertical frame 46, but the technique disclosed in the present specification is not limited to such an example. For example, as shown in FIG. 10, a plurality of through holes 148 may be formed in the vertical frame 46 so that the position of the through holes 148 can be finely adjusted according to the length of the hanging chain 50 and the like. That is, even if there is a dimensional error in the holding mechanism 42 or the suspension chain 50, the position of the through hole 148 is adjusted according to the dimensional error, and the rotation input shaft 26 is preferably aligned with the motor output shaft 27. be able to.

Alternatively, as shown in FIG. 11, a slide member 150 may be slidably attached to the vertical frame 46 to form a through hole 154 in the slide member 150. That is, in the example shown in FIG. 11, the slide member 150 is formed with a through hole 152 extending in the longitudinal direction. The slide member 150 is fixed to the vertical frame 46 by connecting bolts 49 via the through holes 152. Therefore, the position of the slide member 150 fixed to the vertical frame 46 is adjusted within the range in which the through hole 152 is formed. Thereby, the position of the through hole 154 to which the suspension chain 50 is connected can be finely adjusted according to the length of the suspension chain 50.

Further, in the above-described embodiment, the suspension chain 50 is attached to the vertical frame 46 extending downward from the horizontal frame 44, but the present invention is not limited to such an example. For example, as shown in FIG. 12, through holes 148a and 148b may be formed in the horizontal frame 144, and suspension chains 150a and 150b may be connected to the through holes 148a and 148b. Further, in order to make the holding mechanism 142 compact, the positions of the through holes 148a and 148b in the width direction may be positioned inside the outer peripheral surface of the attachment 10.

In this embodiment, the attachment 10 has a crushed stone injection hole 15 formed on the side surface thereof, but the attachment 10 is not limited to such a form. For example, an attachment for forming a crushed stone pile having a crushed stone input hole at the upper end may be used. Further, the technique disclosed in the present specification can be applied to various attachments that can be attached to the ground improvement machine. Further, in this embodiment, a metal chain is used as the wire-like member for suspending the attachment 10, but the present invention is not limited to such an example, and for example, a metal wire, a band, or the like can be used. Further, in this embodiment, two wire-shaped members are used to suspend the attachment 10, but the number of wire-shaped members is not limited to two, and may be one or three or more. You may.

Although specific examples of the disclosed techniques have been described in detail in the present specification, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing.

10: Attachment 11: Drive device 12: Cylindrical part 13: Fin 14: Spiral part 15: Crushed stone input hole 20: Opening and closing lid 32: Crushed stone input device 40: Ground improvement machine 42: Holding mechanism 100: Ground improvement device

Claims (5)

Ground improvement machine and
It is detachably attached to the ground improvement machine and is equipped with an attachment for excavating the ground.
The ground improvement machine
With the leader
A drive device that is attached to the reader and can move up and down along the axis of the reader.
It is provided with a holding means that can move up and down integrally with the drive device and hold the attachment.
The attachment is provided at one end thereof and includes a connecting portion that is detachably connected to a rotary output shaft that is rotationally driven by the drive device.
The holding means is a ground improvement device that holds the connecting portion of the attachment in the vicinity of the rotary output shaft when the attachment is connected to the rotary output shaft. The holding means is
The frame attached to the drive device and
The ground improvement device according to claim 1, wherein one end thereof is attached to the frame and the other end is detachably attached to the attachment, and one or a plurality of wire-shaped members for lifting the attachment. The attachment includes an attachment-side mounting portion provided in the vicinity of the connecting portion.
The other end of the wire-shaped member is detachably attached to the attachment side attachment portion.
The ground improvement device according to claim 2, wherein the frame includes a frame-side mounting portion to which one end of the wire-shaped member is mounted. A recess into which the connecting portion is inserted is formed on the lower end surface of the rotary output shaft.
The rotating output shaft and the attachment are connected by inserting the connecting portion of the attachment into the recess.
The ground improvement device according to claim 2 or 3, wherein the position of the frame-side mounting portion in the height direction is set in the vicinity of the position in the height direction of the lower end surface of the rotation output shaft. The axis of the rotary output shaft extends in the vertical direction, the axis of the rotary output shaft coincides with the axis of the attachment, and the height of the lower end surface of the rotary output shaft and the upper end surface of the connecting portion of the attachment. When the ground improvement machine and the attachment are viewed from the side while the heights of the above are the same,
The ground improvement device according to claim 4, wherein the angle formed by the straight line connecting the attachment side mounting portion and the frame side mounting portion and the axis of the rotation output shaft is within the range of 30 to 80 °.

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