JP2015124498A - Ground compaction method for soft sandy ground and ground compaction device used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground compaction method for a soft sandy ground that can make the soft ground vibrate easily and reliably and compact the ground efficiently and at a low cost.SOLUTION: In a ground compaction method for a soft sandy ground in which a shaft 20 is penetrated into a soft sandy ground 1 to a prescribed depth and a surrounding ground 2 in which the shaft 20 has been penetrated is compacted, the shaft 20, having a magnet 25 in the lower side with a vibrator 22, an N pole and an S pole magnetized alternately in a ring form from the edge side, as well as a magnet 27 on the upper side with an N pole and an S pole magnetized alternately in a ring form, is used to generate a vibration H in the vertical direction and an impact with the vibrator 22, by having the magnet 25 on the lower side repel against and attracted to the magnet 27 on the upper side as a result of a rotary motion of the magnet 27 on the upper side, after penetrating the shaft 20 to the prescribed depth into the soft sandy ground 1, and the volume of the surrounding ground 2, into which the shaft 20 has been penetrated, is compressed by the vibration H in the vertical direction and the impact by the vibrator 22, to compact the soft ground of the surrounding ground 2.

Description

  The present invention relates to a soft sandy ground compaction method and a ground compaction device used for the method.

  As this kind of soft sandy ground compaction method, a rod is penetrated into the soft sandy ground by vibro hammer, and the soft sandy material is caused by vibration in the soft sandy ground by an eccentric body (vibrating body). A construction method (for example, refer to Patent Document 1) for compacting the ground is known.

Japanese Patent Laid-Open No. 1-127716

  However, in the construction method described in Patent Document 1, the construction machine that compacts the soft sandy ground is large, and for example, if an attempt is made to install a vibrating body at the tip of the rod, a device is required and the cost is high. There was a problem.

  Accordingly, the present invention has been made to solve the above-described problems, and a compact device using the magnetic force of a magnet can vibrate soft ground easily and reliably and can be compacted efficiently and at low cost. An object of the present invention is to provide a soft sandy ground compaction method and a small ground compaction device used in the method.

  In the soft sandy ground compaction method of the present invention, at least two magnets alternately magnetized with N and S poles are inserted into the soft sandy ground, and the other magnet is moved by moving one of the magnets. The gist is to increase the density of the surrounding ground that has penetrated the magnet and to compact it by repelling and attracting the magnet to the one magnet to generate vibration and impact.

  Further, the ground compaction apparatus using the soft sandy ground compaction method of the present invention includes a hollow sand as a shaft penetrating into the soft sandy ground to a predetermined depth, and the surrounding ground into which the hollow pipe is penetrated. In the ground compaction device used for the soft sandy ground compaction method, a hollow tube provided with magnets alternately magnetized with N poles and S poles facing each other on the tip side is provided. The gist is that the empty pipe can be inserted into and pulled out from the soft sandy ground by the lifting mechanism.

  According to the soft sandy ground compaction method of the present invention, the movement of one magnet penetrating into the soft sandy ground makes the other magnet repelled and attracted to the one magnet, thereby causing vibration and impact. Since the density of the surrounding ground that has penetrated the magnet is increased and compacted, the small ground using the magnetic force of the magnet can vibrate the soft ground easily and reliably and tighten it efficiently and at low cost. Can be hardened.

  Further, according to the ground compaction apparatus used in the soft sandy ground compaction method of the present invention, the hollow tube provided with the magnets alternately magnetized with the N pole and the S pole facing the tip side is provided. In addition, since this hollow tube is made to be able to penetrate into and pull out from the soft sandy ground by an elevating mechanism, a small ground compaction device in which the tip side of the hollow tube vibrates can be provided at low cost. As a result, the soft ground can be vibrated easily and reliably and compacted efficiently and at low cost. In addition, it is not necessary to install hydraulic power supply pipes, etc., simply by installing a magnet on the tip side of the hollow pipe, and it is possible to add / remove an additional hollow pipe to / from the hollow pipe. Becomes easy.

It is explanatory drawing which shows the state before the ground compaction by the soft sandy ground compaction construction method of 1st Embodiment of this invention. It is explanatory drawing which shows the ground compaction state by the soft sandy ground compaction construction method of the said 1st Embodiment. It is explanatory drawing which shows the state before the ground compaction by the soft sandy ground compaction construction method of 2nd Embodiment of this invention. It is explanatory drawing which shows the ground compaction state by the soft sandy ground compaction construction method of the said 2nd Embodiment. It is sectional drawing of the principal part of the axis | shaft used for the soft sandy ground compaction method of 3rd Embodiment of this invention. It is sectional drawing which shows the state which rotated the upper magnet provided in the said axis | shaft. It is a top view of the upper magnet. It is a top view of the lower magnet opposite to the upper magnet. It is explanatory drawing which shows the state which penetrates the said axis | shaft into soft sandy ground and compacts soft sandy ground. It is a side view which shows the ground compaction apparatus used for the soft sandy ground compaction construction method of the said 3rd Embodiment. It is sectional drawing of the principal part of the axis | shaft used for the soft sandy ground compaction construction method of 4th Embodiment of this invention. It is sectional drawing which follows the XX line in FIG. It is explanatory drawing which shows the state which penetrates the said axis | shaft into a soft sandy ground. It is explanatory drawing which shows the state which draws out the said axis | shaft and compacts a soft ground.

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

<First Embodiment>
FIG. 1 is an explanatory diagram showing a state before ground compaction by the soft sandy ground compaction method of the first embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a ground compacted state.

  In the soft sandy ground compaction method according to the first embodiment, as shown in FIGS. 1 and 2, first, predetermined means (for example, a small ground compaction device 10 described later) is provided in the soft sandy ground 1. ), Two magnets 4 and 5 alternately magnetized with N and S poles are penetrated to a predetermined depth with the plate-like non-magnetic material 3 interposed. The nonmagnetic body 3 is fixed by a fixing means (not shown) so as to be in a horizontal state at a predetermined position in the soft sandy ground 1, and two magnets 4 are arranged above and below the horizontal nonmagnetic body 3. 5 are arranged so as to face each other.

  Next, the upper magnet 4 is reciprocated in the horizontal direction by driving means (not shown). Repulsion (repulsion between N poles and S poles) / adsorption (by N poles and S poles) due to magnetic forces between the N poles and S poles of the upper magnet 4 By vibration), vibration is generated in the lower magnet 5. By compressing the vertical vibration H of the lower magnet 5 and the impact of the vertical vibration H, the volume of the soft ground of the surrounding ground 2 penetrating the two magnets 4 and 5 is compressed to increase its density. And compact the soft ground.

  In this way, the lower magnet 5 is vibrated by the reciprocating movement of the upper magnet 4 in the horizontal direction on the non-magnetic body 3, and the lower magnet 5 gives vertical vibration and impact to the surrounding ground 2, Since the soft ground of the ground 2 is compacted, the soft ground of the peripheral ground 2 can be easily and surely vibrated and compacted efficiently and at low cost by a small device using magnetic force.

  Further, the magnetic force of the upper magnet 4 is varied (for example, the magnitude of the upper magnet 4 is made larger or smaller than that of the lower magnet 5 to vary the magnetic force, or the N pole and the S pole) The magnetic force is varied by changing the width of the magnets 4 and 5 between the upper and lower magnets), thereby changing the displacement amount and amplitude of the lower magnet 5 to generate an impact rather than micro vibrations. By giving to soft ground containing gravel, the effect of compacting soft ground containing gravel can be further improved.

Second Embodiment
FIG. 3 is an explanatory diagram showing a state before ground compaction by the soft sandy ground compaction method of the second embodiment of the present invention, and FIG. 4 is an explanatory diagram showing a ground compacted state.

  In the soft sandy ground compaction method of the second embodiment, as shown in FIGS. 3 and 4, first, predetermined means (for example, a small ground compaction device 10 described later) or the like is placed in the soft sandy ground 1. ), Two magnets 4 and 5 alternately magnetized with N and S poles are penetrated to a predetermined depth with the plate-like non-magnetic material 3 interposed. The non-magnetic member 3 is fixed in a vertical position at a predetermined position in the soft sandy ground 1 by a fixing means (not shown), and two magnets 4 are provided on the left and right sides of the non-magnetic member 3 in the vertical state. 5 are arranged so as to face each other.

  Next, the left magnet 4 is reciprocated in the vertical direction by driving means (not shown). Repulsion of magnetic force between N pole and S pole of right magnet 5 (repulsion by N poles and S poles) and adsorption (adsorption by N poles and S poles) due to magnetic forces of N pole and S poles of left magnet 4 ) To cause the right magnet 5 to vibrate. By compressing the volume of the soft ground of the surrounding ground 2 penetrating the two magnets 4 and 5 by the horizontal vibration G of the right magnet 5 and the impact of the horizontal vibration G, the density is increased. Compact the soft ground.

  Thus, the right magnet 5 is vibrated by the reciprocating movement of the left magnet 4 along the non-magnetic body 3 along the non-magnetic material 3, and the right magnet 5 applies horizontal vibration and impact to the surrounding ground 2, Since the soft ground of No. 2 is compacted, the soft ground of the peripheral ground 2 can be easily and surely vibrated and compacted efficiently and at low cost by a small device using magnetic force.

  Further, the magnetic force of the left magnet 4 is varied (for example, the size of the left magnet 4 is made larger or smaller than that of the right magnet 5, and the magnetic force is varied, or the N pole and the S pole are changed. By making the width different between the left and right magnets 4 and 5, the magnetic force is varied) to change the displacement and amplitude of the right magnet 5 to generate an impact rather than a slight vibration. By giving to soft ground containing slag, the effect of compaction of soft ground containing gravels can be further improved.

  In the first embodiment, the non-magnetic material 3 is inserted into the soft sandy ground 1 so as to be horizontal, and in the second embodiment, the non-magnetic material 3 is inserted into the soft sandy ground 1. The surrounding ground has penetrated two magnets 4 and 5 in all directions of 360 degrees by changing the penetration direction of the non-magnetic material 3 with respect to the soft sandy ground 1. 2 soft ground can be compacted.

<Third Embodiment>
FIG. 5 is a cross-sectional view of the main part of the shaft used in the soft sandy ground compaction method of the third embodiment of the present invention, FIG. 6 is a cross-sectional view showing a state where the upper magnet provided coaxially is rotated, FIG. 7 is a plan view of the upper magnet, FIG. 8 is a plan view of the lower magnet opposite to the upper magnet, and FIG. 9 is a diagram showing a soft sandy ground by coaxially penetrating the soft sandy ground. FIG. 10 is a side view showing a ground compacting device used in the soft sandy ground compaction method.

  First, the ground compaction apparatus 10 used for the soft sandy ground compaction method of the third embodiment will be described.

  As shown in FIG. 10, the ground compaction device 10 is a construction machine that compacts the soft sandy ground 1, and includes a construction machine main body 11 in which a leader 12 is erected on the front side. The front surface 12a of the leader 12 is provided with a movable holding body 13 that moves up and down along the front surface 12a while holding the upper end side of the hollow tube (shaft) 20. A fixed holding body 14 that holds the hollow tube 20 is attached to the lower end side of the front surface 12 a of the leader 12. Further, an elevating mechanism 15 for elevating and lowering the hollow tube 20 is provided on the side surface side of the leader 12. A rotation drive mechanism 19 that rotates the hollow tube 20 in the forward and reverse directions is provided below the movable holding body 13.

  The elevating mechanism 15 includes a drive sprocket 16 provided at the upper end portion of the side surface of the leader 12, a driven sprocket 17 provided at the lower end portion of the side surface of the leader 12, and a chain 18 stretched between these sprockets 16, 17. It consists of and. A movable holding body 13 is fixed to a part of the chain 18, and the movement holding body 13 moves in the vertical direction along the front surface 12 a of the leader 12 by the rotation of the chain 18. 20 is penetrated and pulled out in the soft sandy ground 1 without vibration and noise.

  As shown in FIGS. 5, 6, and 9, the hollow tube (shaft) 20 is formed in a cylindrical shape, and a pair of excavation bits 21 and 21 are provided on the periphery of the tip thereof.

  Further, the hollow tube 20 has an oscillator 22, a compression coil spring (elastic body) 24, a guide 20 b protruding from the inner peripheral surface 20 a of the hollow tube 20, and a recess 25 b from the front end side in the vertical direction. A cylindrical lower magnet 25 in which the amount of protrusion is restricted, and a cylindrical upper magnet 27 that rotates into the hollow tube 20 via a non-magnetic material 26 as a partition plate.

  As shown in FIG. 8, the lower magnet 25 has N and S poles alternately magnetized in a ring shape, and a disc-shaped vibrator is provided at the center of the lower surface 25 c via a support shaft 23. 22 is fixed. Further, the lower magnet 25 and the vibrator 22 are placed upward (upper magnet) between the lower surface 25c of the lower magnet 25 and the bent portion 20c protruding to the distal end side of the inner peripheral surface 20a of the hollow tube 20. A compression coil spring (elastic body) 24 that urges toward the 27th side is interposed.

  As shown in FIG. 7, the upper magnet 27 has N and S poles alternately magnetized in a ring shape, and the lower end of the rotary shaft 28 is fixed at the center of the upper surface 27a. As shown in FIG. 5, the upper end side of the rotary shaft 28 is connected to a drive actuator 29 such as an electric motor or a hydraulic motor. The drive actuator 29 is operated by an operation panel (not shown) provided in a driver's seat of the construction machine main body 11 of the ground compacting device 10. By this operation, the upper magnet 27 is rotated in a predetermined direction.

  The hollow tube 20 provided with the vibrator 22, the compression coil spring 24, and the two magnets 25 and 27 attached to the leader 12 of the construction machine main body 11 of the ground compaction device 10 is connected via the lifting mechanism 15. The soft sandy ground 1 can be penetrated and pulled out without vibration and noise. When the upper magnet 27 is rotated after penetrating the hollow tube 20 to the predetermined depth in the soft sandy ground 1, the lower magnet 25 of the upper magnet 27 due to the magnetic force of the north and south poles is rotated. The vibrator 22 is caused to generate vertical vibration H and impact by repulsion of the magnetic force of the N and S poles (repulsion by the N and S poles) and adsorption (adsorption by the N and S poles). It is configured.

  Next, the compacting process of the soft sandy ground ground 1 by the soft sandy ground compaction method of the third embodiment will be described based on the drawing of FIG.

  First, the hollow tube 20 in which the vibrator 22, the compression coil spring 24, the lower magnet 25, and the upper magnet 27 are provided inside is installed in the leader 12 of the construction machine main body 11 of the ground compacting device 10. Next, as shown in FIG. 9, the hollow tube 20 is inserted through the lifting mechanism 15 and the rotation drive mechanism 19 of the construction machine body 11 while being rotated to a predetermined depth in the soft sandy ground 1. When the hollow tube 20 penetrates, the drive actuator 29 is turned off.

  Then, as shown in FIG. 9, after penetrating the hollow tube 20 to a predetermined depth in the soft sandy ground 1, the drive actuator 29 is operated (ON) to rotate the upper magnet 27. By the rotational movement of the upper magnet 27, the lower magnet 25 is repelled and attracted to the upper magnet 27 to generate vertical vibration H and impact, and the vertical vibration and impact cause the hollow tube The volume of the surrounding ground 2 penetrating 20 is compressed by the vertical vibration and impact of the vibrator 22 to increase the density thereof, and the soft ground of the surrounding ground 2 is compacted.

  Thus, after penetrating the hollow tube 20 into the soft sandy ground 1 via the forced lifting mechanism 15 of the construction machine main body 11, the upper magnet 27 is rotated in the vertical direction to the vibrator 22 by rotational movement. Since H and impact are generated and the soft ground of the surrounding ground 2 is compacted by the vertical vibration and impact of the vibrator 22, the small ground compaction device 10 using the magnetic force of the two magnets 25 and 27 is used. Thus, the soft ground of the surrounding ground 2 can be vibrated easily and reliably and compacted efficiently and at low cost.

  In addition, by generating vertical vibration and impact at the distal end side of the hollow tube 20 penetrating into the soft sandy ground 1, the improvement effect can be greatly improved in compaction and chemical injection.

  Furthermore, since the vibrator 22, the compression coil spring 24, the lower magnet 25, and the upper magnet 27 are provided in order from the tip of the hollow tube 20, it is not necessary to install a supply pipe for power such as hydraulic pressure, It is easy to attach and detach the hollow tube for addition to the hollow tube 20 and to remove it. Further, by adding the hollow tube for addition to the hollow tube 20 even in the small ground compaction device 10, The hollow pipe 20 can be deeply penetrated into the ground to compact the soft ground easily and at low cost.

<Fourth embodiment>
11 is a cross-sectional view of the main part of the shaft used in the soft sandy land compaction method of the fourth embodiment of the present invention, FIG. 12 is a cross-sectional view taken along the line XX in FIG. 11, and FIG. FIG. 14 is an explanatory view showing a state of penetrating into the sandy ground, and FIG. 14 is an explanatory view showing a state where the coaxial ground is pulled out and the soft ground is compacted.

  In the soft sandy ground compaction method of the fourth embodiment, the ground compaction is performed using the ground compaction device 10 shown in FIG. 10 as in the case of the third embodiment.

  As shown in FIGS. 11 to 14, the hollow tube (shaft) 30 is non-magnetic and is formed in a cylindrical shape, and its tip is closed by a disk-shaped bottom plate 31. A pair of excavation bits 32, 32 project from the periphery of the disc-shaped bottom plate 31.

  Further, as shown in FIGS. 11 and 12, a cylindrical inner magnet 33 is slidably provided on the inner peripheral surface 30a slightly above the tip of the hollow tube 30. Furthermore, a plurality of (for example, eight) rectangular cutouts 30b are formed at the position of the hollow tube 30 opposite to the inner magnet 33, and a plurality of rectangular cutouts 30b are provided outside the cutouts 30b. The outer magnets 34 and 35 are disposed. A plate-like vibrator 36 is attached to the outer surfaces of the outer magnets 34 and 35. Each of the outer magnets 34 and 35 and the vibrator 36 are provided with a plurality of sets at a predetermined distance (in this embodiment, eight sets at 45 degree intervals as shown in FIG. 12). The vibrator 36 positioned outside the outer peripheral surface 30c is covered with a stretchable rubber body (elastic body) 37 so as to be sealed. The outer magnets 34 and 35 are attached so as to be reciprocally movable in the horizontal direction by a guide 30d protruding around the notch 30b of the outer peripheral surface 30c of the hollow tube 30.

  Further, as shown in FIG. 12, the inner magnet 33 has N and S poles alternately magnetized in a ring shape, and the lower end of the rotating shaft 38 is fixed at the center of the upper surface 33a. As shown in FIG. 11, the upper end side of the rotary shaft 38 is connected to a drive actuator 39 formed of an electric motor, a hydraulic motor, or the like. The drive actuator 39 is operated by an operation panel (not shown) provided in a driver's seat of the construction machine main body 11 of the ground compacting device 10. By this operation, the inner magnet 33 rotates in a predetermined direction.

  Further, as shown in FIG. 12, the outer magnets 34 and 35 are configured by alternately arranging N-pole magnets 34 and S-pole magnets 35 in a ring shape. As a result, when the outer S pole magnet 34 is positioned at the N pole of the inner magnet 33 and the outer N pole magnet 35 is positioned at the S pole of the inner magnet 33, as shown in FIG. Further, the outer magnets 34 and 35 are attracted to the inner magnet 33 by the N pole and the S pole, and the outer N pole of the inner magnet 33 is rotated by the rotation of the inner magnet 33. When the magnet 35 is located and the outer S pole magnet 34 is located at the S pole of the inner magnet 33, each of the outer magnets 34 with respect to the inner magnet 33 by the N poles and the S poles. , 35 repels, and the vibrator 36 attached to each of the outer magnets 34, 35 moves outward. By repeating this, a vibration G in the horizontal direction is generated by the vibrator 36.

  The hollow tube 30 attached to the leader 12 of the construction machine main body 11 of the ground compaction device 10 is penetrated / pulled out into the soft sandy ground 1 via the lifting mechanism 15 without vibration and noise. It is like that. Further, as shown in FIG. 14, when the hollow tube 30 is pulled out after penetrating to the predetermined depth in the soft sandy ground 1, or at a fixed position after penetrating to the predetermined depth, the inner magnet 33 is disposed. The horizontal vibration G is generated in the vibrator 36 by repeating the adsorption of the inner magnet 33 and the outer magnets 34 and 35 and the repulsion of the inner magnet 33 and the outer magnets 34 and 35 by the rotational movement of It is constituted as follows.

  Next, the compacting process of the soft sandy ground ground 1 by the soft sandy ground ground compacting method of the fourth embodiment will be described based on the drawings of FIGS. 13 and 14.

  First, the hollow tube 30 provided with the inner magnet 33 and the plurality of sets of outer magnets 34 and 35 and the vibrator 36 is installed in the leader 12 of the construction machine main body 11 of the ground compaction device 10. Next, as shown in FIG. 13, the hollow tube 30 is inserted through the lifting mechanism 15 and the rotation drive mechanism 19 of the construction machine main body 11 while being rotated to a predetermined depth in the soft sandy ground 1. When the hollow tube 30 penetrates, the drive actuator 39 is turned off.

  And after penetrating the hollow tube 30 to the predetermined depth in the soft sandy ground 1, as shown in FIG. 14, the hollow tube 30 is passed through the elevating mechanism 15 and the rotation drive mechanism 19 of the construction machine main body 11. When pulling out while rotating backward to a predetermined height, the drive actuator 39 is operated (ON) to rotate the inner magnet 33. By rotating the inner magnet 33, the outer magnets 34 and 35 are repelled and attracted to the inner magnet 33 to generate horizontal vibrations G and shocks. The volume of the surrounding ground 2 is compressed by the horizontal vibration and impact of the vibrator 36 while the empty tube 30 is pulled out, and the density is increased and the soft ground of the surrounding ground 2 is compacted.

  Further, the outer magnets 34 and 35 are moved relative to the inner magnet 33 by the rotational movement of the inner magnet 33 at a fixed position after the hollow tube 30 has penetrated to a predetermined depth in the soft sandy ground 1. By repelling and adsorbing, the vibrator 36 generates horizontal vibration G and impact, and the volume of the peripheral ground 2 penetrating the hollow tube 30 is compressed by the horizontal vibration and shock of the vibrator 36 to thereby compress the peripheral ground 2. May be compacted.

  Thus, when pulling out after inserting the hollow tube 30 into the soft sandy ground 1 through the forced lifting mechanism 15 of the construction machine body 11, or at a fixed position after penetrating to a predetermined depth, Due to the repulsion and adsorption of the outer magnets 34 and 35 due to the rotation of the inner magnet 33, the vibrator 36 generates horizontal vibration G and impact, and the soft ground of the surrounding ground 2 due to the horizontal vibration and impact. Is compressed and the density thereof is increased and compacted, so that the soft ground of the surrounding ground 2 can be vibrated easily and reliably by the small ground compaction device 10 using the magnetic force of each magnet 33, 34, 35. Can be compacted efficiently and at low cost.

  That is, a hollow tube 30 provided with a plurality of sets of vibrators 36, magnets 34 and 35, and an inner magnet 33 and covered with a rubber body 37 in order from the outer side of the distal end side is provided. 15, the small sand compacting device 10 in which the distal end side of the hollow tube 30 vibrates can be provided at low cost. Thereby, the surrounding ground 2 which penetrated the hollow pipe 30 of the soft sandy ground 1 can be vibrated easily and reliably and can be compacted efficiently and at low cost.

  Further, by generating horizontal vibration and impact at the distal end side of the hollow tube 30 penetrating into the soft sandy ground 1, the improvement effect can be greatly improved in compaction and chemical injection.

  Furthermore, since a plurality of sets of vibrators 36, magnets 34 and 35, and an inner magnet 33 are provided in order from the outer side of the distal end side of the hollow tube 30, a supply pipe for power such as hydraulic pressure is not installed. Thus, it is easy to add or remove a hollow tube for addition to or from the hollow tube 30. Further, the small ground compaction device 10 can add a hollow tube for addition to the hollow tube 30. As a result, the hollow pipe 30 can penetrate deeply into the ground, and the soft ground can be compacted easily and at low cost.

  Further, around the inner magnet 33 of the hollow tube 30, eight sets of outer magnets 34, 35 and vibrators 36 are provided at intervals of 45 degrees, and vibrations located outside the outer peripheral surface 30 c of the hollow tube 30. By covering the child 36 with the elastic rubber body 37, water can be surely sealed without entering the hollow tube 30, and horizontal vibration can be generated efficiently. .

  In addition, according to the said embodiment, although the raising / lowering mechanism which raises / lowers a hollow tube was comprised with the drive sprocket, the driven sprocket, and the chain, you may comprise an raising / lowering mechanism with a rack, a drive pinion, etc. Further, the shaft penetrating into the ground is not limited to a hollow tube or the like, but may be a rod-like body such as a metal rod.

  Further, according to the third embodiment, eight sets of vibrators and outer magnets that generate horizontal vibration in the hollow tube are provided at intervals of 45 degrees, but may be four sets at intervals of 90 degrees.

  Further, by changing the moving speed of the magnet, the frequency of vibration and impact may be varied to increase the density of the surrounding ground and more effectively compact the surrounding ground.

DESCRIPTION OF SYMBOLS 1 Soft sandy ground 2 Peripheral ground 4,5 Two magnets 10 Ground compaction device 15 Lifting mechanism 20 Hollow pipe (shaft)
22 vibrator 24 compression coil spring (elastic body)
25 Lower magnet 27 Upper magnet 30 Hollow tube (shaft)
33 Inner magnet 34 N-pole magnet (outer magnet)
35 S pole magnet (outside magnet)
36 vibrator 37 elastic rubber body (elastic body)
H Vertical vibration G Horizontal vibration

Claims (8)

A soft sandy ground compaction method in which at least two magnets are inserted into the soft sandy ground, and the surrounding ground into which each magnet has penetrated is compacted.
Using at least two magnets in which N and S poles are alternately magnetized, the movement of one magnet causes the other magnet to be repelled and attracted to the one magnet to generate vibration and impact. And a soft sandy ground compaction method characterized by increasing the density of the peripheral ground by impact and compacting the peripheral ground. It is a soft sandy ground compaction method that penetrates magnets into the soft sandy ground at the upper and lower positions, and compacts the surrounding ground that has penetrated each magnet,
Using the upper and lower magnets in which the north and south poles are alternately magnetized in a ring shape, the upper magnet is repelled and attracted to the upper magnet by the rotational movement of the upper magnet. A soft sandy ground compaction method characterized in that vibration and impact are generated, and the density of the surrounding ground is increased by the vertical vibration and impact to compact the surrounding ground. A soft sandy ground compaction method that penetrates magnets into the left and right positions respectively in the soft sandy ground, and compacts the surrounding ground that has penetrated each magnet,
Using an inner magnet in which N poles and S poles are alternately magnetized in a ring shape, and a plurality of outer magnets in which N pole magnets and S pole magnets are alternately arranged in a ring shape, rotational movement of the inner magnets A plurality of outer magnets are repelled and attracted to the inner magnets to generate horizontal vibration and impact, and the density of the surrounding ground is increased by the horizontal vibration and impact to compact the surrounding ground. A soft sandy ground compaction method. The soft sandy ground compaction method according to any one of claims 1 to 3,
A soft sandy ground compaction method characterized in that by changing the speed of moving the magnet, the frequency of vibration and impact is varied to increase the density of the peripheral ground and compact the peripheral ground. In the ground compaction device used in the soft sandy ground compaction method, which penetrates the shaft into the soft sandy ground to a predetermined depth and compacts the surrounding ground penetrating the shaft,
From the tip side, there is provided a lower magnet that moves vertically, with the vibrator, N pole, and S pole magnetized alternately in a ring shape, and a rotating upper magnet that alternately magnetizes the N pole and S pole in a ring shape. A hollow tube as the shaft is provided, and the hollow tube can be penetrated and pulled out into the soft sandy ground by an elevating mechanism, and the hollow tube is penetrated to a predetermined depth in the soft sandy ground. After that, the ground is configured to generate vertical vibration and impact on the vibrator by repulsion / adsorption of the lower magnet with respect to the upper magnet by the rotational movement of the upper magnet. Compaction device. The ground compaction device according to claim 5,
A ground compaction device characterized in that an elastic body for biasing the lower magnet toward the upper magnet is interposed between the vibrator and the lower magnet. In the ground compaction device used for the soft sandy ground compaction method, which penetrates the shaft into the soft sandy ground to a predetermined depth and compacts the surrounding ground penetrating the shaft,
A magnet in which N poles and S poles are alternately magnetized in a ring shape is provided on the inner side, and a plurality of magnets formed by alternately arranging a vibrator, N pole magnets, and S pole magnets in a ring shape are provided on the outer side. A hollow tube as the shaft is provided, and the hollow tube can be penetrated and pulled out into the soft sandy ground by an elevating mechanism, and the hollow tube is penetrated to a predetermined depth in the soft sandy ground. After that, at least when pulling out, the vibrator is configured to generate horizontal vibration and impact by repulsion and adsorption of the plurality of outer magnets with respect to the inner magnet due to the rotational movement of the inner magnet. A ground compaction device characterized by A ground compaction device according to claim 7,
The ring-shaped magnet, the plurality of magnets, and the vibrator are respectively disposed from the inner side to the outer side of the hollow tube, and the vibrator located outside the outer peripheral surface of the hollow tube is formed as an elastic elastic body. Ground compaction device characterized by being coated with

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