JP2006316592A - Ground consolidation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To consolidate a hole wall by pressing excavated earth and sand outward in the diametral direction without carrying the earth and sand to the ground surface upon excavation, and to easily form a sand pile containing only unmixed sand. <P>SOLUTION: The ground consolidation device comprises; a drive shaft 3 which is supported so as to be liftable by a working machine 2 at its base end and driven to rotate in right and reverse directions; a conveying part 5 formed on the outer periphery of the drive shaft 3 for conveying the sand to the front end side by its reverse rotation; a consolidating cam 7 which is provided on the front end of the drive shaft 2 capable of excavating the ground by its right rotation, and provided with at least two cam surfaces 7a for pressing the sand coming from the conveying part 5 toward the hole bottom of an excavated hole 6 and outward in the direction of the diameter by the reverse rotation; and a casing 9 formed to be a hollow square-column and provided in a manner of covering the outer periphery of the drive shaft 3 including the conveying part 5. The casing 9 presses and consolidates the hole wall 6a of the excavated hole 6 outward in the diametral direction by rotating together with the drive shaft 3 upon its right rotation, and stops its rotation upon the reverse rotation of the drive shaft 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ground compaction apparatus that improves compaction of soft ground into a columnar shape, and more particularly to a ground compaction apparatus that improves consolidation 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 compacting reaction force resists the load applied from the work machine side and the earth auger gradually pulls up from the excavation hole, thereby creating a columnar consolidated foundation (sand pile) in the ground.

  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, The soil does not spread so much in the lateral direction (outside of the borehole), and the sediment is immediately compacted in the vertical direction to produce a compaction 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.

  Therefore, in order to solve such a problem, the present inventor previously proposed a ground compaction device that can easily form a column compaction foundation having a sufficient strength and having a lateral extension (see Japanese Patent No. 3259910). ). The ground compaction device is provided so that a base end portion can be moved up and down by a working machine, a drive shaft having a rotation drive unit at the base end portion, and earth and sand such as excavated sediment along the drive shaft. It is provided at the tip of the transporting part (spiral wing) and the drive shaft, and excavation of the ground is possible by forward rotation, and the sand and sand from the transporting part is pushed outward in the radial direction of the excavation hole by reverse rotation And a compacting cam having a predetermined shape having at least two cam surfaces having an arcuate cross section.

Japanese Patent No. 3259910

  By the way, 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 then only pure sand (for example, mountain sand) for sand pile formation is brought 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 building high-strength sand piles. 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 drive 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.

  Therefore, the present invention has been made in consideration of the above circumstances, and it is possible to consolidate the hole wall by pushing the excavated earth and sand radially outward without excavating it to the ground during excavation, and also sand of pure sand only An object of the present invention is to provide a ground compaction device capable of easily creating a pile.

  In order to achieve the above object, an invention according to claim 1 is provided on a drive shaft that is supported by a work machine so that the base end portion can be moved up and down and is rotated in forward and reverse directions, and on an outer periphery of the drive shaft. , A conveying unit that conveys sand to the tip side by the reverse rotation, and a tip of the drive shaft, the ground can be excavated by the normal rotation, and the sand from the conveying unit is drilled by the reverse rotation A compaction cam having at least two cam surfaces that are compacted by being pushed to the bottom side and radially outward, and an outer periphery of the drive shaft including the conveying portion are provided so as to be integrated with the drive shaft when the drive shaft is rotated forward. A hollow prismatic casing is provided which rotates to consolidate the hole wall of the excavation hole radially outwardly and stops rotating when the drive shaft rotates in the reverse direction.

  According to a second aspect of the present invention, in the ground compaction device according to the first aspect, the base end portion of the casing is provided with a one-way clutch that transmits only the power in the forward rotation direction from the drive shaft to the casing. Features.

  The invention according to claim 3 is the ground compaction apparatus according to claim 1, wherein the casing is provided with a plurality of inlets with lids that can be opened and closed to allow sand to enter in the longitudinal direction at appropriate intervals. To do.

  According to a fourth aspect of the present invention, in the ground compaction device according to the third aspect, a hopper is detachably attached to the charging port.

  According to a fifth aspect of the present invention, in the ground compaction apparatus according to the first aspect, the working machine includes a guide portion that suppresses a shake during forward rotation of the casing and a co-rotation of the casing during the reverse rotation of the drive shaft. An auxiliary mechanism having a rotation stop portion that can be selectively used is provided.

  According to the first aspect of the present invention, the base end portion is supported by the work machine so as to be movable up and down, and the drive shaft is rotationally driven in the forward and reverse directions, and is provided on the outer periphery of the drive shaft. Is provided at the front end of the drive shaft and the front end of the drive shaft, and excavation of the ground is possible by forward rotation, and sand from the transfer portion is removed from the bottom of the excavation hole and radially outside by reverse rotation. A compaction cam having at least two cam surfaces that are pushed inward and compacted, and an outer periphery of the drive shaft including the conveying portion, and is rotated integrally with the drive shaft when the drive shaft is rotated forward. A hollow prismatic casing that does not carry excavated earth and sand to the ground during excavation because it has a hollow prismatic casing that consolidates the hole wall radially outward and stops rotating when the drive shaft rotates backward The hole wall is pushed radially outward by the rotation of It can be compacted, a sand pile only pure sand is fed into only pure sand through the casing until the compaction cam can be easily reclamation.

  According to the invention of claim 2, since the one-way clutch that transmits only the power in the forward rotation direction from the drive shaft to the casing is provided at the base end portion of the casing, a complicated rotation mechanism is not required. The casing can be rotated only during excavation, and the structure can be simplified and the cost can be reduced.

  According to the third aspect of the present invention, since the casing is provided with a plurality of inlets with lids that can be opened and closed at appropriate intervals in the longitudinal direction, the casings are sequentially formed as the sand piles are consolidated. Even if pushed up, sand can be easily poured into the casing on the ground.

  According to the invention which concerns on Claim 4, since the hopper is attached to the said insertion port so that attachment or detachment is possible, the injection | throwing-in operation | work of the sand in a casing can be performed still more easily.

  According to the invention which concerns on Claim 5, the said working machine selectively has the guide part which suppresses the shake | fluctuation at the time of forward rotation of a casing, and the rotation stop part which suppresses the joint rotation of a casing at the time of reverse rotation of a drive shaft. Since the auxiliary mechanism which can be used is provided, workability | operativity improves.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional side view schematically showing a configuration of a main part of a ground compaction apparatus according to an embodiment of the present invention. 2 is an enlarged sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged sectional view taken along line BB in FIG. 1, FIG. 4 is a side view of the casing when a hopper is attached, and FIG. FIG. 6 is a sectional view taken along line C, FIG. 6 is an enlarged sectional view taken along line DD of FIG. 4, and FIG. 7 is a side view of the hopper. FIGS. 8A and 8B are diagrams showing an auxiliary mechanism, in which FIG. 8A is a plan view in which a rotation stop portion is selected and used, FIG. 8B is a side view thereof, FIG. 8C is a plan view in which a guide portion is selected and used, and FIG. FIG. 9 is a diagram for explaining the work by the ground compaction device, (a) is a figure at the time of ground excavation work, (b) is a figure at the end of the ground excavation work, and (c) is a figure at the end of the ground excavation work. The figure at the time of ground consolidation work, (d) is the figure at the end of the ground consolidation work.

  In these drawings, reference numeral 1 denotes a ground compacting device. The ground compacting device 1 is supported by a work machine 2 (see FIG. 9A) so that the base end portion can be moved up and down and is driven to rotate in forward and reverse directions. The shaft 3 is provided on the outer periphery of the drive shaft 3 and is provided at the front end portion of the drive shaft 3 to convey the sand 4 to the front end side by reverse rotation thereof. The ground G can be excavated by forward rotation. And a compaction cam 7 having at least two cam surfaces 7a for compacting the sand from the transport unit 5 by pushing it inward and radially outward of the excavation hole 6 by reverse rotation, and the transport unit 5. It is provided so as to cover the outer periphery of the drive shaft 3, and rotates integrally with the drive shaft 3 when the drive shaft 3 rotates forward to consolidate the hole wall 6 a of the excavation hole 6 radially outward, and when the drive shaft 3 rotates reversely And a hollow prismatic casing 9 whose rotation is stopped.

  As shown in FIG. 9A, the work machine 3 is provided with a lead portion 10 that is held upright on the ground, and can be moved up and down on the lead portion 10, and a base end portion (upper end) of the drive shaft 3. A rotation drive unit 11 that grips and rotates. The rotation drive unit 11 is composed of, for example, a hydraulic motor. The lead portion 9 is provided with an elevating drive unit (not shown) that moves the rotary drive unit 11 up and down via a chain. The transport unit 5 is constituted by, for example, a spiral blade 12 provided in a spiral shape on the outer periphery of the drive shaft 3.

  As shown in FIGS. 1 and 2, the compaction cam 7 is composed of two cam plates 8 having a circular arc cross section and a side inverted triangular shape. These cam plates 8 are formed, for example, by cutting a side surface of a large diameter steel pipe into a triangular shape. The two cam plates 8 are arranged so as to face the inside and sandwich the drive shaft 3 at the tip of the drive shaft 3 and are symmetrically displaced with respect to the drive shaft 3 left and right. It is fixed to the drive shaft 3.

  Accordingly, as shown in FIG. 2, when the consolidation cam 7 is rotated (forward rotation) in the clockwise direction (arrow A), the inner surface 8x of the side protrusion 8a of the cam plate 8 protruding outward in the radial direction is grounded. G can be excavated and, conversely, when the compaction cam 7 is rotated in the counterclockwise direction (arrow B) (reverse rotation), the sand is moved downward and tangentially on the outer surface 8y of the side protrusion 8a of the cam plate 8. It can be compressed by pushing outward in the radial direction. The cam plate 8 is preferably integrally fixed to the drive shaft 3 by welding or the like, but may be detachably attached by a coupling means such as a bolt and a nut.

  The casing 9 is made of, for example, a steel pipe having a square cross section, that is, a steel square pipe (square tube body). The casing (square tube body) 9 has a length that covers the entire length of the spiral blade 12, and a portion having the spiral blade 12 of the drive shaft 3 is rotatably accommodated in the casing 9. The consolidation cam 7 is provided at a protruding portion of the drive shaft 3 protruding from the tip of the casing 9. As shown in FIG. 2, the side protrusion 8 a on the proximal end side of the consolidation cam 7 preferably protrudes outward in the radial direction from the side surface 9 a of the casing 9.

  In addition, it is preferable that the rotation radius of the corner | angular part 9b of the four corners of the casing 9 and the rotation radius of the side protrusion part 8a of the base end side of the consolidation cam 7 are substantially the same. As shown in FIG. 2, the casing 9 rotates in the same clockwise direction as the drive shaft 3 during excavation by the compaction cam 7, so that the corner portion of the casing 9 is not carried out to the ground without excavating excavated earth and sand excavated by the compaction cam 7. The hole wall 6a can be consolidated by pushing it in the tangential direction or radially outward on the rotation direction side surface near 9b and the corner.

  As a means for rotationally driving the casing 9 in the same direction as the drive shaft 3 during ground excavation by the compaction cam 7, only one direction of power in the forward rotation direction is transmitted from the drive shaft 3 to the casing 9 to the base end portion of the casing 9. A clutch 13 is provided. As shown in FIGS. 1 to 3, the one-way clutch 13 has a cylindrical clutch case 13a that rotatably supports the drive shaft 3, and an outer periphery of the drive shaft 3 is provided on the inner periphery of the clutch case 13a. A plurality of, for example, four groove portions 15 that individually accommodate a plurality of, for example, four rollers 14 that are rotatable clutch members are provided. Each groove portion 15 is formed by gradually reducing the diameter in a wedge shape in the clockwise direction, and each groove portion 15 is provided with a spring 16 as an urging means for urging the roller 14 in the clockwise direction.

  As a result, when the drive shaft 3 rotates in the clockwise direction, the roller 14 moves to the reduced diameter side of each groove portion 15 so that the rotational force is transmitted from the drive shaft 3 to the clutch case 13a by the wedge action. When rotating in the counterclockwise direction, the roller 14 moves against the urging force of the spring 16 toward the diameter expansion side of each groove portion 15, so that the rotational force is not transmitted from the drive shaft 3 to the clutch case 13a.

  In order to detachably connect the one-way clutch 13 and the casing 9, flange portions 13 f and 9 f that are detachably connected to each other by bolts and nuts 17 are provided on the clutch case 13 a and the casing 9 so as to face each other. Yes. In the illustrated example, the drive shaft 3 on the one-way clutch 13 side and the casing 9 side are integrally formed, but may be formed separately.

  After excavating the ground G to a predetermined depth (design depth) h, the drive shaft 3 is rotated counterclockwise, and pure sand (for example, mountain sand) 4 is consolidated through the casing 9 by the rotation of the rotary blades 12 of the transport unit 5. An inlet 19 is provided in the casing 9 in order to feed the sand 4 into the casing 9 in order to feed the sand 7 into the cam 7 and to form the sand pile 18 by compacting the sand 4 by rotation of the compacting cam 7. Further, it is preferable that a lid 20 is provided at the insertion port 19 so as to be opened and closed. A hopper 21 is preferably attached to the insertion port 19.

  In this case, in order to enable the sand to be easily poured into the casing 9 on the ground even when the casing 9 is sequentially raised upward as the sand pile 18 is consolidated, the casing 9 includes sand. It is preferable that a plurality of inlets 19 with lids 20 that can be opened and closed are provided at appropriate intervals in the longitudinal direction. The insertion port 19 is formed in a rectangular shape on one side surface of the casing 9, and the lid 20 is provided on one side of the insertion port 19 via a hinge 22 so as to be horizontally rotatable. As locking means for fixing the lid 20 in a closed state, cylindrical lock members 23a and 23b having shaft holes that coincide with each other when the lid 20 is in a closed state are provided on the front end portion of the lid 20 and one side surface of the casing 20. The lid 20 can be fixed in a closed state by inserting a pin 24 across the shaft holes of the locking members 23a and 23b.

  A hopper 21 is detachably attached to the insertion port 19 with the lid 20 opened. The hopper 21 includes a bottom plate 21 a and side plates 21 b on both sides, and the tip is inserted and engaged with the insertion port 19. The bottom plate 21a is provided with a reinforcing plate 25 that abuts on one side of the casing 9 below the inlet 19 and the both side plates 21b between the reinforcing plate 25 and the lower wall of the inlet 19 of the casing 9. A holding plate 26 is provided to hold and hold.

  As shown in FIGS. 9 (a) to 8, the working machine 2 has a steady stop portion 27 a that restricts the shake of the casing 9 during forward rotation and the casing 9 when the drive shaft 3 rotates backward. An auxiliary mechanism 27 having a restricting rotation stop portion 27b that can be selectively used is provided. The reason why the co-rotation of the casing 9 is restricted during the reverse rotation is that if the casing rotates together with the drive shaft, it becomes difficult to convey sand by the rotation of the spiral blade 12. The auxiliary mechanism 27 includes a substantially U-shaped base portion 28 having a mounting portion 28 a attached to the lower front portion of the lead portion 10 of the work machine 2 and left and right sides of the base portion 28 via support shafts 29. And a pair of arc-shaped arm portions 30 provided to be openable and closable.

  Both arm portions 30 are formed in a closed state so that the tip portions overlap each other vertically, and are fixed in a closed state by inserting a pin 32 into a hole 31 formed in the overlapping portion. It has become. In this state, as shown in FIG. 8 (c), a circular opening that restricts the lateral casing 9 from supporting the rectangular casing 9 so as to be rotatable and movable in the longitudinal direction by the base portion 28 and the both arm portions 30 is prevented. A steady rest 27a is formed.

  Further, as shown in FIG. 8A, four restriction pins 33a to 33d are inserted into the base portion 28 and the arm portion 30 so as to be in contact with the four surfaces of the rectangular casing 9 to form a drive shaft. Insertion holes 34a to 34d for forming a rotation stop portion 27b that suppresses the co-rotation of the casing 9 at the time of reverse rotation of 3 are provided. A pin hole 35 for inserting a retaining pin (not shown) for preventing the inserted restriction pins 33a to 33d from coming off is formed in the base portion 28 and the arm portion 30 and the restriction pins 33a to 33d. The cross sections of the regulation pins 33a to 33d are circular. Although the rotation of the casing 9 is restricted by the restriction pins 33a to 33d that are inserted and arranged in the form of a cross beam, the movement along the longitudinal direction of the casing 9 is not restricted, so the consolidation reaction force accompanying the formation of the sand pile And can be moved up by the lifting force by the lifting drive.

  Next, the operation of the ground compacting device 1 having the above configuration will be described. When excavating the ground G, as shown in FIG. 8A, the compaction cam 7 at the front end is rotated forward via the drive shaft 3 by rotational drive, and a hollow prismatic shape is formed via the one-way clutch 13. The casing 9 is also rotated forward, and the ground G is excavated by applying a downward load to the ground compaction device 1 by the lifting drive unit of the work implement 2. In this excavation process, the ground G is excavated by the inner surface 8x of the lateral protrusion 8a of the cam plate 8 constituting the consolidation cam 7, and the excavated earth and sand (ground soil) is not carried out to the ground, but has a hollow prismatic shape. As the casing 9 is rotated, each corner 9b of the casing is pushed tangentially or radially outward to consolidate the hole wall 6a. In this excavation process, as shown in FIG. 8 (c), the casing 9 is supported by the circular opening steadying portion 27a of the auxiliary mechanism so as to be rotatable and movable in the axial direction. It is regulated. Further, since the square casing 9 is in contact with the hole wall 6a by line contact with the corner wall 9a, unlike the circular casing that is in surface contact with the hole wall 6a, the square casing 9 has less frictional resistance and can be easily driven to rotate. Can do.

  In this way, as shown in FIG. 8B, when the ground G is excavated to a required depth, the restriction pin 33a is formed on the auxiliary mechanism 27 so as to form a rotation stop portion 27b that suppresses the co-rotation of the casing 9. -33d are inserted in a cross-beam shape, and a retaining pin (not shown) is inserted into the pin hole 35 to hold the restriction pin. Further, the lid 20 of the inlet 19 near the ground in the casing 9 is opened and a hopper 21 is attached, and sand is introduced into the casing 9 from the hopper 21. By switching the rotation direction of the rotary drive unit 11 and rotating the drive shaft 3 in the reverse direction as shown in FIG. 9C, the sand is fed to the lower compaction cam 7 by the spiral blade 12 and the compaction cam 7 is configured. The sand is pushed downward and tangentially or radially outward on the outer surface 8y of the lateral protrusion 8a of the cam plate 8 to be consolidated.

  As a result, the sand piles 18 are successively formed upward from the hole bottom, and the ground compaction device 1 rises as the sand piles 18 are formed. As this rises, it is only necessary to replace the hopper 21 in the lower inlet 19 and throw sand into it. Thus, the sand pile 18 is completed by forming the sand pile 18 to a hole opening as shown in FIG.9 (d).

  In the consolidation process of the sand pile 18, since the hole wall 6a is preliminarily consolidated using excavated earth and sand in the excavation (drilling) process, there is no fear that the sand 4 is pushed outward in the radial direction more than necessary. The amount of sand 4 used can be reduced. Moreover, since excavated earth and sand are used for consolidation of the hole wall 6a and are not carried to the ground, processing of excavated earth and sand is not required. Moreover, since the sand pile 18 can be created only with pure sand without mixing the ground earth and sand or the excavated earth and sand, a high-strength sand pile can be easily created.

  The consolidation cam 7 receives a consolidation reaction force from the hole bottom side, but receives a greater consolidation reaction force from the hole wall 6a side (in the radial direction of the drilling hole), so that the ground consolidation is performed as in the conventional ground auger method. The device will not be pushed up unintentionally. For this reason, it is not necessary to apply a load against the consolidation reaction force to the ground compaction device, and therefore the work machine 2 is not necessarily enlarged and can be miniaturized. The degree of consolidation can be inferred from the torque applied to the rotary drive unit 11 and the sand pile 18 which is a columnar consolidation foundation can be obtained by gradually pulling up the ground compacting device 1 while maintaining a desired compaction density. Can be created.

  Thus, according to the ground compaction device 1, the base end portion is supported by the work machine 2 so as to be movable up and down, and is provided on the outer periphery of the drive shaft 3 that is driven to rotate in the forward and reverse directions. It is provided at the tip of the drive shaft 3 that transports sand to the tip side by the reverse rotation, and the ground G can be excavated by the forward rotation, and the sand from the transport unit 5 is excavated by the reverse rotation. A compaction cam 7 having at least two cam surfaces 7 a that are pushed inward and radially compacted to the bottom side of the hole and the outer periphery of the drive shaft 3 including the transport unit 5 is provided so as to cover the outer periphery of the drive shaft 3. A hollow prismatic casing 9 is provided which rotates integrally with the hole 6a during the forward rotation to consolidate the hole wall 6a of the excavation hole 6 radially outward, and stops rotating when the drive shaft 3 rotates backward. For this reason, during excavation, the hollow square columnar The hole 9a can be pressed radially outward by the rotation of the ring 9 to consolidate the hole wall 6a. During consolidation, only pure sand is fed through the casing 9 to the consolidation cam 7 and high strength sand piles 18 made of pure sand only. Can be easily created.

  Although the casing 9 is a consumable product, since a commercially available square steel pipe such as a building material can be used as the casing 9, the cost can be reduced. Further, since the compaction cam 7 which is a consumable item can be produced using a steel pipe, the cost can be reduced. As the consolidation cam 7, a consolidation cam described in Japanese Patent No. 3259910 may be used.

  A one-way clutch 13 is provided at the base end portion of the casing 9 to transmit only the power in the forward rotation direction from the drive shaft 3 to the casing 9, so that the casing 9 is driven during excavation without requiring a complicated rotation mechanism. It can rotate integrally with the shaft 3, and the structure can be simplified and the cost can be reduced. Since the casing 9 is provided with a plurality of inlets 19 with lids 20 that can be opened and closed at appropriate intervals in the longitudinal direction, the casing 9 is sequentially raised as the sand pile is consolidated. Even in this case, the sand can be easily poured into the casing 9 on the ground.

  Further, since the hopper 21 is detachably attached to the charging port 19, the sand can be charged into the casing 9 more easily. Further, the work implement 2 is selectively provided with a tactile anti-vibration portion 27a that suppresses vibration when the casing 9 is rotated forward and a rotation stop portion 27b that suppresses co-rotation of the casing 9 when the drive shaft 3 rotates reversely. Since the auxiliary mechanism 27 that can be used is provided, the workability can be further improved.

  FIG. 10 is a cross-sectional view showing a modification of the ground compaction device. In the present embodiment, the same parts as those in the previous embodiment are denoted by the same reference numerals and the description thereof is omitted. In the present embodiment, in order to suppress wear of the corner portion 9b of the hollow square-shaped casing 9, each corner portion 9b has a reinforcing member 36 made of a small diameter steel pipe having a notch portion 36a having an opening angle of 90 degrees, for example. Is provided by welding or the like. According to this, wear of the corner 9b of the casing 9 can be suppressed or prevented, and durability can be improved.

  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 above-described embodiments, and various design changes and the like can be made without departing from the scope of the present invention. is there. For example, in the above embodiment, a consolidation cam having two cam surfaces is illustrated, but three or more cam surfaces may be provided. It is preferable to provide a cemented carbide tip for preventing wear on the cam surface. As the cross-sectional shape of the casing, a quadrangle is preferable, but if it is other than a circle, it may be a triangle, pentagon, polygon, or a corner of which is formed into a curved surface, an ellipse or an oval good. A bearing that rotatably supports the drive shaft may be provided at the tip of the casing in a state that does not interfere with the conveyance of sand.

It is a partial cross section side view which shows roughly the structure of the principal part of the ground compaction apparatus which concerns on embodiment of this invention. It is an AA line expanded sectional view of FIG. It is a BB line expanded sectional view of Drawing 1. It is a side view of a casing at the time of attaching a hopper. It is CC sectional view taken on the line of FIG. FIG. 5 is an enlarged sectional view taken along line DD of FIG. 4. It is a side view of a hopper. It is a figure which shows an auxiliary mechanism, (a) is a top view which selects and uses a rotation stop part, (b) is the same side view, (c) is a top view which selects and uses a steady part, (d) is an arm part. It is the expanded top view. 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 | finish, (c) is a figure at the time of ground consolidation work, (d) is a figure. It is a figure at the time of the ground consolidation work completion | finish. It is a cross-sectional view showing a modification of the ground compaction device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground compaction apparatus 2 Working machine 3 Drive shaft 4 Sand 5 Conveying part 6 Excavation hole 6a Hole wall 7 Consolidation cam 7a Cam surface 9 Casing 13 One-way clutch 19 Input port 20 Lid 21 Hopper 27 Auxiliary mechanism 27a Stabilization part 27b Rotation stop Part

Claims (5)

  A driving shaft that is supported by the work machine so that the base end portion can be moved up and down, and is driven to rotate in forward and reverse directions; a conveying portion that is provided on the outer periphery of the driving shaft and conveys sand to the distal end side by the reverse rotation; At least two cams that are provided at the tip of the drive shaft, can excavate the ground by forward rotation, and compress sand by pushing the sand from the conveying unit to the bottom of the excavation hole and radially outward by reverse rotation A confining cam having a surface and an outer periphery of the drive shaft including the conveying portion are provided so as to rotate integrally with the drive shaft when the drive shaft is rotated forward, thereby consolidating the hole wall of the excavation hole radially outward. A ground compaction device comprising a hollow prismatic casing that stops rotating when the drive shaft rotates in the reverse direction.   The ground compaction device according to claim 1, wherein a one-way clutch that transmits only power in a forward rotation direction from the drive shaft to the casing is provided at a base end portion of the casing.   2. The ground compaction device according to claim 1, wherein a plurality of inlets with lids that can be opened and closed are provided in the casing at appropriate intervals in the longitudinal direction.   The ground compaction device according to claim 3, wherein a hopper is detachably attached to the charging port.   The working machine is provided with an auxiliary mechanism that can selectively use a guide portion that suppresses vibration during forward rotation of the casing and a rotation stop portion that suppresses co-rotation of the casing during reverse rotation of the drive shaft. The ground compaction device according to claim 1, wherein:

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