JP5535279B2 - Ground compaction device - Google Patents

Description

  The present invention relates to a ground compaction device that improves soft soil in a columnar shape, and more particularly to a ground compaction device that further improves the compaction performance.

  As one method for consolidating soft ground, a columnar consolidation method (also called a sand pile method) based on an excavation earth auger is known. In this method, after excavating the ground to the required depth with an earth auger, the earth and sand added to the ground soil previously dug by reverse rotation of the earth auger is sent to the bottom of the excavation hole and consolidated, The ground auger is gradually pushed up from the excavation hole against the load applied from the work machine side, and a columnar consolidated foundation (also called a columnar foundation or sand pile) is created in the ground. is there.

  However, in the above construction method, earth and sand are fed along the longitudinal direction of the earth auger by reverse rotation of the earth auger, but due to the mounting angle of the spiral blade of the earth auger, the component in the vertical direction of the pressure becomes higher, Does not spread so much in the lateral direction (outwardly of the digging hole), and the sediment immediately compacts in the vertical direction to generate a consolidation reaction force. It is difficult to create.

  Further, in the above construction method, since a difference in the degree of consolidation occurs due to a load that resists the consolidation reaction force that pushes up the earth auger, it is necessary to apply a sufficient load from the work machine side. About 10 tons are necessary, and this is a limitation when trying to develop a small machine in accordance with the circumstances of a narrow residential area in an urban area.

  In order to solve such a problem, the present inventor has previously proposed a ground compaction device that can easily form a columnar base body having a sufficient strength in the lateral direction (see Patent Document 1). This ground compaction device is supported by a work machine so that the base end portion can be moved up and down, and a rotary shaft having a rotation driving unit at the base end portion, and a rotary shaft so as to convey earth and sand such as excavated sediment along the rotary shaft. The transport part (spiral wing) provided on the tip and the tip of the rotating shaft, the ground can be excavated by forward rotation, and the earth and sand from the transport part is moved outward in the radial direction of the excavation hole by reverse rotation A compression cam having a predetermined shape having at least two cam surfaces having a circular arc cross-section to be pressed and consolidated.

  However, in the ground compaction device, while excavating the ground, the excavated soil is carried to the ground by a spiral wing and excavated to the required depth, and only pure sand (for example, mountain sand) for sand pile formation is transported to the compaction cam. When trying to create a high-strength sand pile by feeding in, not only pure sand but also soil in the hole wall will be sent by the spiral wing, and a sand pile mixed with sand and soil will be created. May not be suitable for high-strength columnar foundations. As a countermeasure, the present inventor has also proposed an invention in which a cylindrical casing is provided so as to surround the periphery of the rotating shaft, and only pure sand is fed to the compaction cam by the casing. In this case, since the outer peripheral surface of the casing is in surface contact with the hole wall, it sticks to the hole wall and the frictional resistance increases, which may be a great resistance to digging the ground.

  Moreover, when constructing a sand pile of pure sand only, it is necessary to treat excavated earth and sand carried to the ground. In addition, when sand is fed and consolidated by a compaction cam, the hole wall is not consolidated, so the sand may be pushed inwardly in the radial direction of the drilling hole and a large amount of sand may be required. It is possible that there is. Moreover, although the hopper for supplying sand is provided in the upper end part of the said casing, it is necessary to supply sand with respect to the hopper with heavy machinery, such as a bucket crane, and an operation | work is difficult.

Japanese Patent No. 3259910

  The present invention has been made in consideration of the above circumstances, and by rotating the rotating shaft and the casing together during excavation, the excavated sediment is pushed radially outward without bringing it to the ground to consolidate the hole wall. It is possible to easily construct the columnar foundation by feeding the replenishment material to the bottom of the hole by rotating only the rotating shaft when pushing the replenishment material such as sand, gravel or aggregate and solidified material into the hole. An object of the present invention is to provide a possible ground compaction device.

  In order to achieve the above-mentioned object, the present invention has a work machine that has a base end portion that can be lifted and lowered, and an opening for feeding supplemental materials such as sand, gravel or aggregate and solidified material to the peripheral wall. A plurality of cylindrical casings formed at appropriate intervals in the direction and the axial direction, and rotation that is rotated forward or reversely by a rotation drive unit that is inserted along the axial center in the casing and provided at the base end of the casing. A shaft and a tip provided at the tip of the rotating shaft excavate the ground by forward rotation to create a consolidation hole in which the excavated soil is consolidated on the hole wall side, and reverse rotation causes the replenishment material in the casing to pass through the consolidation hole. A screw part that is compacted to the bottom side of the hole to form a columnar foundation, and an upper end part of the casing, and when the consolidation hole is formed, the casing and the rotating shaft are connected together to rotate forward, and the columnar foundation The casing at the time of body construction It is characterized in that a clutch mechanism for reverse rotation only the rotary shaft with and uncoupled the rotary shaft to prevent rotation of the casing in the frictional resistance between the bore wall.

  At the time of forming the consolidation hole, it is preferable that the inside of the casing is filled with the replenishment material to form a pseudo non-hole casing, and the casing, the rotating shaft, the screw portion, and the replenishment material are integrally rotated and press-fitted into the ground.

  The clutch mechanism is fitted in a rotary plate provided on the rotary shaft in proximity to the lower surface of the upper end portion of the casing, and a hole formed in the rotary plate through the upper end portion of the casing. It is preferable to include a lock pin that prevents the rotation shaft from rotating, and an operation unit that allows the lock pin to be fitted into or removed from the hole.

  It is preferable that the operation portion has an operation lever, and the operation lever is formed with a hook portion for engaging the engagement portion at the tip of the operation rod.

  According to the present invention, by rotating the rotating shaft and the casing together during excavation, the excavated earth and sand can be pushed outward in the radial direction without being transported to the ground, and the hole wall can be consolidated. When a replenishing material such as a solidifying material is pushed into the hole, only the rotating shaft is rotated, so that the replenishing material can be fed into the hole bottom and the columnar foundation can be easily formed.

It is a figure showing roughly the state at the time of ground excavation of the ground compaction device concerning the embodiment of the present invention. It is a figure showing roughly the state at the time of columnar foundation construction of a ground compaction device concerning an embodiment of the present invention. (A) is a top view of a screw part, (b) is a XX arrow side view of (a). It is a fragmentary sectional view showing a clutch mechanism, (a) is a figure of a release state, and (b) is a figure of an engagement state. It is a top view which shows an example of a hopper. It is a figure explaining the operation | work by a ground compaction apparatus, (a) is a figure at the time of ground excavation work, (b) is a figure at the time of ground excavation work completion, (c) is a figure at the time of ground compaction work, (d) is a ground It is a figure at the time of completion | finish of consolidation operation | work.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is explained in full detail based on an accompanying drawing.

  As shown in FIGS. 1 and 2, the ground compaction apparatus 1 of the present embodiment is a cylindrical casing 3 that is long in the vertical direction and supported by a work machine 2 [see FIG. Is provided. The casing 3 is made of, for example, a cylindrical steel pipe. The length of the casing 3 depends on the columnar base body 18 to be created, but is 5 to 8 m, for example, and the diameter of the casing 3 is 300 to 500 mm. The upper end portion (base end portion) of the casing 3 is closed by detachably attaching an end plate 3a by bolting, and the lower end portion (tip end portion) of the casing 3 is an open end.

  The peripheral wall of the casing 3 has an opening 5 in the casing 3 in which the supply material 4 such as sand, gravel or aggregate and solidified material can be supplied (injected) at the height position of the ground G. A plurality are formed at appropriate intervals in the direction. As the replenishment material 4, a wide variety of materials can be used including a combination of a plurality of materials, and aggregates and various solidification materials (cement etc.) that can be flowed by the ground compaction device 1. Thus, it is possible to create the columnar base body 18 having a necessary strength.

  In order to ensure the strength of the casing 3, it is preferable that the adjacent openings 5 are arranged so as to be shifted in the circumferential direction so as not to be aligned in the axial direction of the casing 3. For example, the opening 5 is formed in a so-called honeycomb shape in which turtle shell-shaped ones are arranged in a staggered manner as in the illustrated example. By forming in this way, the strength of the casing 3 can be improved and the replenishment material 4 can be smoothly fed. The opening 5 may be rectangular as shown in FIG. 6, or may be triangular, circular, elliptical, or the like.

  In addition, the outer peripheral surface of the lower end side of the casing 3 has a predetermined range, for example, W = 1 m, in order to prevent inflow and circulation of the excavated earth and sand from the opening portion 5 into the casing 3 during excavation by driving the screw portion 6 described later. It is preferable that the non-hole part 7 which does not have the opening part 5 is formed.

  A rotation shaft 8 is inserted into the casing 3 along the axis, and a rotation drive capable of switching the rotation direction for rotating the rotation shaft 8 forward or backward is provided above the end plate 3 a at the upper end of the casing 3. Part 9 is provided. This rotational drive part 9 consists of a hydraulic motor with a gear, for example.

  An upper portion of the rotation drive unit 9 is provided with a locked portion 11 that is locked to the lifting / lowering hook 10 of the work machine 2 and suspends the ground compaction device 1. The rotating shaft 8 penetrates the end plate 3 a of the casing 3 loosely, and a rotating plate 20 described later is attached to the rotating shaft 8 in the casing 3. When the rotary drive unit 9 is lifted by the work implement 2, the rotary plate 20 can come into contact with the lower surface of the flange portion 3 b of the casing 3 to lift the casing 3.

  As shown in FIG. 6A, the work machine 2 has a lead portion 12 that is held upright on the ground, and a lifting hook 10 is attached to the lead portion 12 via an endless chain (not shown). An elevating rotation driving unit (not shown) for elevating operation is provided. In addition, as the work machine 2, as long as the ground compaction apparatus 1 can be lifted and pushed downward, for example, a truck crane for burying a power pole may be used.

  The lower end portion of the rotating shaft 8 protrudes from the lower end portion of the casing 3. The ground G is excavated by the forward rotation at the lower end portion of the rotating shaft 8, and the consolidation hole 13 in which the excavated earth and sand is consolidated to the hole wall 13 a side. The replenishing material 4 in the casing 3 is pushed into the hole bottom 13b side of the consolidation hole 13 and radially outward by consolidation by reverse rotation, and the screw portion 6 is a consolidation portion for creating the columnar foundation 18. Is provided. The screw portion 6 is composed of two semi-disc-shaped blade members 14 and 15 in this embodiment, and the two blade members 14 and 15 intersect the rotation shaft 8 in an X shape when viewed from the side. It is preferable that lower ends 14b and 15b opposite to each other as viewed from above are provided so as to protrude outward from the casing 3 [FIGS. 1 and 3 (a)]. reference〕.

  In order to make it easy to carry out the replenishment material 4 from the casing 3, the upper end edges 14 a and 15 a of the blade members 14 and 15 are provided in a state of being inserted into the casing 3, or a non-hole portion in the rotary shaft 8. It is preferable that at least one spiral blade 16 is provided in a portion corresponding to 7. Further, in order to smoothly transport the replenishment material 4 charged into the casing 3 from the hopper 17 through the opening 5 downward, the rotating shaft 8 is provided with a plurality of spiral blades 16 intermittently at predetermined intervals. Or are provided continuously. The tip of the lower end portion of the rotating shaft 8 is a sharp portion 8a protruding at an acute angle.

  On the ground G around the casing 3, a hopper 17 for introducing the replenishment material 4 into the casing 3 from the opening 5 is installed as shown in FIG. The hopper 17 of the present embodiment is formed in a planar semi-annular shape having an opening at the bottom and top and spreading upward as shown in FIG. 2 or 5, for example.

  During excavation, the replenishment material 4 can be easily charged and filled from the opening 5 into the casing 3 below the ground G by the hopper 17. When the replenishment material 4 is filled in the casing 3, the opening 5 of the casing 3 below the ground G is closed with the replenishment material 4, and the excavated earth and sand of the hole wall 13 a is prevented from entering the casing 3. It is possible to reduce the friction resistance when the surface of the casing 3 is in close contact with the hole wall 13a and digs.

  At the upper end of the casing 3, the casing 3 and the rotating shaft 8 are coupled together when the consolidation hole 13 is formed and rotated together (co-rotates), and when the columnar foundation 18 is formed, the connection between the casing 3 and the rotating shaft 8 is released. Thus, a clutch mechanism 19 is provided for preventing the rotation of the casing 3 by the frictional resistance with the hole wall 13a and for rotating only the rotating shaft 8 in the reverse direction.

  As shown in FIGS. 4A and 4B, the clutch mechanism 19 includes a rotary plate 20 provided on the rotary shaft 8 near the lower surface of the end plate 3 a that is the upper end portion of the casing 3, and the upper end of the casing 3. A lock pin 22 that passes through the end plate 3a that is a part and is fitted into a hole 21 formed in the rotary plate 20 and prevents the rotation of the rotary shaft 8 through the rotary plate 20, and the lock pin 22 through the hole 21 and an operation lever 23 that is an operation unit that is fitted to or detached from the hole 21. The hole 21 is preferably formed as a long circular arc slit in the circumferential direction so that the lock pin 22 can be easily fitted. An inward flange portion 3b is provided at the upper end of the casing 3, and an end plate 3a is bolted to the inward flange portion 3b.

  The operation lever 23 is extended in the horizontal direction, and the base end portion of the operation lever 23 is pivotally supported by a bracket bearing 24 erected on the end plate 3 a at the upper end portion of the casing 3 so as to be rotatable in the vertical direction. Is done. An upper end portion of the lock pin 22 is pivotally supported in the middle portion in the longitudinal direction of the operation lever 23, and a guide hole 25 through which the lock pin 22 is vertically inserted is formed in the flange portion 3 b and the end plate 3 a at the upper end of the casing 3. .

  On the end plate 3a, there is provided a positioning holding portion 26 for holding the operation lever 23 at either a lock position where the lock pin 22 is inserted into the hole portion 21 of the rotating plate 20 or a release position where the lock pin 22 is released from the hole portion 21. It is done. As shown in a partially enlarged view, the positioning holding unit 26 includes, for example, a sphere (for example, a steel ball) 29 held via springs 28 at two upper and lower positioning holding positions in the positioning holding frame 27, and the operation lever 23. It is mainly composed of a recess 30 that is formed on one side surface and engages with a sphere 29.

  For example, the operation lever 23 moves the clutch mechanism 19 to the locked position after the columnar foundation 18 is formed as shown in FIG. 6 (d) or before the excavation of the ground is started as shown in FIG. 6 (a). It is turned downward to operate, and after the excavation of the ground as shown in FIG. 6B, it is turned upward to operate the clutch mechanism 19 to the unlocked position. After the excavation of the ground G, the operation lever 23 is in a position close to the ground G, that is, at a height at which the operator can directly operate, whereas after the columnar foundation 18 is formed or before the excavation of the ground G is started. Since the operation lever 23 is at a position far from the ground G, that is, at a height that cannot be directly operated by the operator, the operation rod 31 for remote operation is used. The operating rod 31 has a hook portion 31 a at the tip portion, like the shutter rod, and a hook portion 32 for hooking the hook portion 31 a at the tip portion of the operation rod 31 is formed at the tip portion of the operation lever 23.

  Next, the operation of the ground compacting device 1 having the above configuration will be described. First, as shown in FIG. 6A, the ground compaction device 1 is vertically set up by the work machine 2 on the ground G to be ground compacted, and the screw portion 6 at the lower end portion of the rotary shaft 8 is casing by the rotary drive unit 9. 3 and rotate in the excavation direction. Then, the ground G is excavated by applying a downward load to the ground compaction device 1 by the up-and-down rotation drive unit of the lead unit 12 of the work machine 2.

  In this excavation process, as shown in FIG. 4B or FIG. 6D, the operation lever 23 of the clutch mechanism 19 is pulled downward by the operation rod 31 in advance, and the lock pin 22 is inserted into the hole of the rotary plate 20. By being fitted to 21 and kept in a locked state, the rotating shaft 8 and the casing 3 rotate together, and the ground G can be excavated by the blade members 14 and 15 constituting the screw portion 6. Since the screw portion 6 at the tip of the rotary shaft 8 and the casing 3 rotate together, unlike the case where they do not rotate together, the excavated earth and sand (ground soil) hardly flows into the casing 3, and the earth and sand are dotted arrows E in FIG. As shown in Fig. 6, the hole wall 13a of the excavation hole (consolidation hole) 13 can be consolidated with the excavation earth and sand by being pushed tangentially or radially outward without flowing into the casing 3.

  When forming the consolidation hole 13 as this excavation process, as shown in FIG. 6A, a hopper 17 is installed on the ground G to supply the replenishment material 4 into the casing 3 from the hole 5 of the casing 3. It is preferable that the casing is filled with the replenishment material 4 to form a pseudo non-porous casing, and the casing 3, the rotating shaft 8, the screw portion 6, and the replenishment material 4 are integrally rotated and press-fitted into the ground. When the ground G is excavated to a predetermined excavation depth in this way, the operation lever 23 of the clutch mechanism 19 is lifted upward as shown in FIGS. Is extracted from the hole 21 of the rotating plate 20, and the rotation direction of the rotation drive unit 9 is switched to reversely rotate the rotating shaft 8 as shown in FIG. 6C, whereby the blade members 14 and 15 of the screw unit 6 are rotated. As a result, the replenishment material 4 in the casing 3 is supplied and pushed in toward the hole bottom 13b (downward) and tangentially or radially outward to be compacted, and the columnar foundation 18 is formed.

  As a result, the columnar foundation 18 is successively formed upward from the hole bottom 13b, and the ground compaction device 1 is raised by the reaction force as the columnar foundation 18 is formed. Since the replenishment material 4 in the casing 3 also decreases with this rise, the replenishment material 4 is sequentially supplied to the hopper 17 so that the replenishment material 4 is always filled in the casing 3 below the ground G. In this way, as shown in FIG. 6 (d), the columnar basic body 18 is formed to the hole opening, thereby completing the formation.

  In the formation process of the columnar foundation 18, since the hole wall 13 a of the excavation hole (consolidation hole) 13 is previously consolidated using excavation earth and sand in the excavation (drilling) process, the replenishment material 4 has a diameter larger than necessary. There is no fear of being pushed outward in the direction, and the usage amount of the replenishment material 4 can be reduced. Moreover, since excavated earth and sand are used for consolidation of the hole wall 13a and are not carried to the ground, processing of excavated earth and sand is not required. Moreover, since the columnar foundation body 18 can be formed only with the pure supply material 4 without mixing the earth and sand of the ground with the supply material 4 or mixing the excavated earth and sand, the columnar foundation body 18 having high strength can be easily formed. Can be created.

  The blade members 14 and 15 of the screw portion 6 receive a consolidation reaction force from the hole bottom 13b side, but receive a greater consolidation reaction force from the hole wall 13a side (the radial direction of the drilling hole). The ground compaction device 1 is not pushed up unintentionally like the conventional construction method. For this reason, it is not necessary to apply a load against the consolidation reaction force to the ground compacting device 1, and therefore the working machine 2 is not necessarily enlarged and the working machine 2 can be downsized. The degree of compaction can be inferred from the torque applied to the rotary drive unit 9 and the columnar foundation 18 can be formed by gradually pulling up the ground compacting device 1 while maintaining a desired compaction density. .

  Thus, according to the ground compaction device 1, the base end is supported by the work machine 2 so as to be movable up and down, and the opening for introducing the replenishment material 4 such as sand, gravel or aggregate and solidified material to the peripheral wall 5 is forwardly rotated by a cylindrical casing 3 in which a plurality of cylinders 5 are formed at appropriate intervals in the circumferential direction and the axial direction, and a rotary drive unit 9 that is inserted along the axis of the casing 3 and provided at the base end of the casing 3. Alternatively, the rotating shaft 8 is rotated in the reverse direction, and the consolidation hole 13 is formed by excavating the ground G by forward rotation and consolidating the excavated soil on the hole wall 13a side. 3 is provided with the screw portion 6 for forming the columnar foundation 18 by pressing and pressing the replenishment material 4 in the consolidation hole 13 into the hole bottom 13b side, so that the excavated earth and sand are not carried to the ground during excavation. The hole wall 13 is pushed radially outward In addition, only the sand or gravel replenishment material 4 can be easily supplied to the hole bottom 13b side and the hole wall 13a side, and the columnar base body 18 can be easily created, thereby simplifying the structure and work. Can be planned.

  When the consolidation hole 13 is formed, the casing 3 is filled with the replenishment material 4 to form a pseudo non-hole casing, and the casing 3, the rotating shaft 8, the screw portion 6 and the replenishment material 4 are integrally rotated and press-fitted into the ground. The consolidation hole 13 can be formed by easily excavating the ground.

  Further, since a hopper 17 for introducing the replenishment material 4 into the casing 3 from the opening 5 near the ground G is installed on the ground G around the casing 3, the hopper 17 is used without using a bucket crane or the like. The replenishment material 4 can be easily supplied, and the remaining amount of the replenishment material 4 in the hopper 17 can be easily confirmed visually.

  Further, a non-hole portion 7 having no opening 5 is formed in a predetermined range on the outer peripheral surface on the lower end side of the casing 3 in order to prevent the inflow and circulation of excavated earth and sand into the casing 3 during excavation. It is possible to prevent a situation in which it becomes difficult to push the excavated earth and sand into the hole wall 13a when the excavated earth and sand flows from the opening 5 and circulates.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the embodiments, and various design changes can be made without departing from the gist of the present invention. For example, instead of the hopper 17, a plate material such as a steel plate may be placed on the ground and the replenishment material 4 may be placed, and the replenishment material 4 may be thrown into the casing 3 from the opening 5 while being scraped by a scoop or the like. .

  In addition, the casing may be formed in a rectangular tube shape in order to suppress a problem that the excavated earth and sand enters the casing 3 and adheres to the inner wall of the casing to hinder the rotation of the spiral blade. The spiral blade 16 may be provided continuously along the longitudinal direction of the rotating shaft 8. Thereby, the replenishment material 4 thrown in in the casing 3 from the hopper 17 through the opening part 5 can be smoothly conveyed below.

  The clutch mechanism 19 may be a one-way clutch provided between the rotary plate 20 provided on the rotary shaft 8 and the end plate 3 a of the casing 3. The operation lever 23 may be remotely operated by an electric part.

  In order to ensure a larger friction force between the casing 3 and the ground G than the friction force generated through the supply material between the rotary shaft 8 having the spiral blade 16 and the casing 3 during sand pile formation press-fitting, the casing 3 It is preferable that a friction resistance member 40 such as a flat bar is provided on the outer side of the flat plate within a predetermined range in the longitudinal direction from the tip (see FIG. 2).

DESCRIPTION OF SYMBOLS 1 Ground compaction apparatus 2 Working machine 3 Casing 3a End plate 3b Flange part 4 Replenishment material 5 Opening part 6 Screw part 7 Non-hole part 8 Rotating shaft 8a Sharp part 9 Rotation drive part 10 Hook 11 Locked part 12 Lead part 13 Consolidation Hole 13a Hole wall 13b Hole bottom 14, 15 Blade member 16 Spiral blade 17 Hopper 18 Columnar base body 19 Clutch mechanism 20 Rotating plate 21 Hole 22 Lock pin 23 Operation lever (operation section)
24 Bracket bearing 25 Guide hole 26 Positioning operation portion 27 Holding frame 28 Spring 29 Sphere 30 Recess 31 Operation rod 31a Hook portion 32 Hook portion 40 Friction resistance member

Claims (2)

The base end is supported by the work machine so that it can be raised and lowered, and a plurality of openings are formed on the peripheral wall at appropriate intervals in the circumferential direction and the axial direction for supplying replenishing materials such as sand, gravel or aggregate and solidified material. A cylindrical casing, a rotary shaft that is inserted along the axial center in the casing and rotated forward or reversely by a rotation drive unit provided at a base end portion of the casing, and a distal end portion of the rotary shaft. The ground is excavated by forward rotation, and a consolidation hole is formed by consolidating the excavated earth and sand to the hole wall side, and the replenishment material in the casing is consolidated to the bottom of the consolidation hole by reverse rotation to form a columnar foundation. A screw portion that is connected to the casing, and the casing and the rotating shaft are connected to each other when the compaction hole is formed, and the casing and the rotating shaft are connected to each other when the columnar foundation is formed. To release the case A soil compaction apparatus comprising a clutch mechanism for reverse rotation only the rotary shaft as well as prevent rotation of the ring in frictional resistance between the bore wall,
The clutch mechanism is fitted in a rotary plate provided on the rotary shaft in proximity to the lower surface of the upper end portion of the casing, and a hole formed in the rotary plate through the upper end portion of the casing. A lock pin that prevents the rotation of the rotating shaft, and an operation lever that allows the lock pin to be fitted into or removed from the hole,
The operation lever is pivotally supported at the upper end portion of the casing. When the operation lever is rotated, the lock pin is moved up and down in the axial direction of the casing and fitted into the hole. Or removed from the hole,
The distal end portion of the operation lever protrudes radially outward of the casing from the upper end portion of the casing, and a locking portion at the distal end of the operation rod for rotating the operation lever is provided at the distal end portion. A ground compaction device, wherein a hook portion to be locked is formed .   2. The ground according to claim 1, wherein when forming the consolidation hole, the inside of the casing is filled with the replenishment material to form a pseudo non-hole casing, and the casing, the rotating shaft, the screw portion, and the replenishment material are integrally rotated to press-fit into the ground. Compaction device.