JP6145010B2 - Soft sandy ground compaction method and ground compaction device used for the method - Google Patents

Description

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

  In this kind of soft sandy ground compaction method, a rod is inserted into the soft sandy ground with a vibro hammer, and the soft sandy ground is tightened by vibration in the soft sandy ground. Solidification method (for example, refer to Patent Document 1), and sand discharge method from the hollow pipe (casing) for sand pile construction, and a method for compacting sand discharged from the hollow tube and the surrounding ground (for example, refer to Patent Document 2) .)It has been known.

Japanese Patent Laid-Open No. 1-127716 JP 2001-32256 A

  However, the methods described in Patent Documents 1 and 2 have problems in that when soft sandy ground is compacted, vibrations are generated in the vicinity, the ground is displaced, and the construction machine is large. It was.

  Therefore, the present invention has been made to solve the above-described problems, and provides a soft sandy ground compaction method with less vibration and ground displacement and a small ground compaction device used in the method. Objective.

  The soft sandy ground compaction method of the present invention is a soft sandy ground compaction method in which a magnetic source is inserted into the soft sandy ground and the surrounding ground that has penetrated the magnetic source is compacted. Generating the magnetic force of the magnetic source in the soft sandy ground, attracting the soil particles containing iron in the surrounding ground with the magnetic force of the magnetic source, and the soil particles not containing iron also The gist is to increase the density of the surrounding ground and compact by moving it to the vicinity of the magnetic force generation source.

  Further, the ground compaction apparatus using the soft sandy ground compaction method of the present invention penetrates a shaft such as a hollow tube or a double hollow tube into the soft sandy ground to a predetermined depth, and In the ground compaction device used for the soft sandy ground compaction method that compacts the surrounding ground that has penetrated, it is equipped with a shaft with a magnetic force generation source such as a permanent magnet or an electromagnet, and the shaft with this magnetic force generation source is a lifting mechanism The gist is that it can be freely inserted into and pulled out from the soft sandy ground.

  According to the soft sandy ground compaction method of the present invention, the soil particles containing iron in the surrounding ground penetrating the magnetic force generation source are attracted by the magnetic force of the electromagnet, and at the same time, the soil particles not containing iron are attracted by the magnetic force generation source. By moving to the vicinity and compacting the soft ground of the surrounding ground, compaction of the soft ground with less vibration and displacement of the ground can be performed reliably and at low cost in a short time.

  Further, according to the ground compaction device used for the soft sandy ground compaction method of the present invention, a hollow tube provided with a magnetic force source inside, a shaft provided with an electromagnet at the tip, an inner tube and an outer tube A double hollow tube with an electromagnet in between is made to be freely penetrated and pulled out into the soft sandy ground by an elevating mechanism, so that a small ground compaction device can be used for hollow tubes, shafts, and double hollow tubes. Can be smoothly and reliably penetrated into and pulled out from the soft sandy ground, and the soft ground can be compacted quickly and reliably at low cost. Furthermore, by installing an electromagnet, a battery and a receiver on the tip of the hollow tube or double hollow tube, there is no need to install a power supply tube such as hydraulic pressure. It is easy to attach and detach a hollow tube for addition or a double hollow tube to the tube or to remove it.

It is explanatory drawing which shows the ground compaction state 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 2nd Embodiment of this invention. It is explanatory drawing which shows the ground compaction state by the soft sandy ground compaction construction method of 3rd Embodiment of this invention. It is explanatory drawing which shows the ground compaction state by the soft sandy ground compaction construction method of 4th Embodiment of this invention. It is a side view which shows the ground compaction apparatus used for the soft sandy ground compaction construction method of the said 4th Embodiment. It is sectional drawing of the principal part of the hollow pipe used for the soft sandy ground compaction construction method of 5th Embodiment of this invention. It is explanatory drawing which shows the state which penetrates the said hollow pipe into a soft sandy ground. It is explanatory drawing which shows the state which pulls out the said hollow tube. It is explanatory drawing which shows the state which re-penetrates the said hollow tube. It is sectional drawing of the principal part of the double hollow tube used for the soft sandy ground compaction method of 6th Embodiment of this invention. It is explanatory drawing which shows the state which penetrates the said double hollow pipe into a soft sandy ground. It is explanatory drawing which shows the state which pulls out the said double hollow tube. It is explanatory drawing which shows the state which re-penetrates the said double hollow tube.

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

<First Embodiment>
FIG. 1 is an explanatory view showing a ground compaction state by the soft sandy ground compaction method according to the first embodiment of the present invention.

  In the soft sandy ground compaction method of the first embodiment, as shown in FIG. 1, first, an electromagnet is provided in the soft sandy ground 1 via a predetermined means (for example, ground compaction device 10 described later). (Magnetic force generation source) 6 is penetrated to a predetermined depth.

Next, the electromagnet 6 is operated in the soft sandy ground 1 to generate a magnetic force, and the soil particles 3 including the iron 4 in the surrounding ground 2 penetrating the electromagnet 6 are attracted by the magnetic force of the electromagnet 6, and the iron The soil particles 3 that do not contain are also moved to the vicinity of the electromagnet 6 together with the earth particles 3 containing the iron 4 attracted by the magnetic force of the electromagnet 6, thereby compressing the volume of the soft ground of the surrounding ground 2 and its density To soften the soft ground.

  In this way, the soil particles 3 including the iron content 4 in the surrounding ground 2 penetrating the electromagnet 6 are attracted by the magnetic force of the electromagnet 6, and at the same time, the soil particles 3 not including the iron content are also moved to the vicinity of the electromagnet 6, By compacting the soft ground of No. 2, compaction of the soft ground with less vibration and ground displacement can be performed reliably and at low cost in a short time.

Second Embodiment
FIG. 2 is an explanatory view showing a ground compaction state by a soft sandy ground compaction method according to a second embodiment of the present invention.

  In the soft sandy ground compaction method of the second embodiment, as shown in FIG. 2, first, an electromagnet is provided in the soft sandy ground 1 via a predetermined means (for example, ground compaction device 10 described later). (Magnetic force generation source) 7 is penetrated to a predetermined depth.

Next, the electromagnet 7 is operated in the soft sandy ground 1 to generate a magnetic force, and the electromagnet 7 is moved through the ground compaction device 10 so that the iron 4 in the surrounding ground 2 penetrating the electromagnet 7 can be obtained. A state in which the contained earth particles 3 are attracted by the magnetic force of the electromagnet 7 and the earth particles 3 not containing iron are moved to the vicinity of the electromagnet 7 together with the earth particles 3 containing the iron 4 attracted by the electromagnet 7. Then, by further moving the electromagnet 7 through the ground compacting device 10, the volume of the soft ground around the moved electromagnet 7 is compressed, the density is increased and the soft ground is compacted.

  Thus, the soil particles 3 including the iron content 4 in the surrounding ground 2 penetrating the electromagnet 7 are moved by the magnetic force of the electromagnet 7, and at the same time, the soil particles 3 not including the iron content are also moved in the vicinity of the electromagnet 7. By moving these, the soft ground of the peripheral ground 2 is compacted, so that the soft ground with less vibration and ground displacement can be compacted reliably and at low cost in a short time.

<Third Embodiment>
FIG. 3 is an explanatory view showing a ground compaction state by the soft sandy ground compaction method according to the third embodiment of the present invention.

  In the soft sandy ground compaction method according to the third embodiment, as shown in FIG. 3, first, inside the soft sandy ground 1 through a predetermined means (for example, a ground compaction device 10 described later). A non-magnetic (for example, titanium) hollow tube (shaft) 9 provided with an electromagnet (magnetic force source) 8 is penetrated to a predetermined depth.

Next, the electromagnet 8 is actuated to generate a magnetic force from substantially the entire circumference of the hollow tube 9, and this magnetic force attracts the soil particles 3 including the iron content 4 in the surrounding ground 2 penetrating the hollow tube 9, and The soil particles 3 that do not contain the iron particles 4 that are attracted by the magnetic force of the electromagnet 8 are moved to the vicinity of the hollow tube 9 together with the earth particles 3 to compress the volume of the soft ground of the surrounding ground 2, Increase density and compact soft ground.

  Thus, the soil particles 3 containing the iron content 4 in the surrounding ground 2 penetrating the hollow tube 9 provided with the electromagnet 8 are attracted by the magnetic force of the electromagnet 8, and at the same time, the soil particles 3 not containing the iron content are also hollow tube. By moving to the vicinity of the entire circumference of 9 and compacting the soft ground of the surrounding ground 2, compaction of the soft ground with less vibration and ground displacement can be performed in a short time reliably and at low cost. Can do.

<Fourth embodiment>
FIG. 4 is an explanatory view showing a ground compaction state by the soft sandy ground compaction method according to the third embodiment of the present invention, and FIG. 5 is a side view showing a ground compaction device used in the construction method.

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

  As shown in FIG. 5, 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 (casing pipe) 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. The hollow tube 20 provided with the permanent magnet (magnetic force generation source) 25 is penetrated and pulled out into the soft sandy ground 1 without vibration and noise.

  As shown in FIG. 4, the hollow tube 20 is formed in a nonmagnetic cylindrical shape by titanium or the like, and the tip side (lower end side) is closed by a nonmagnetic circular bottom plate 21. A pair of excavation bits 22 and 22 project from the periphery of the bottom plate 21. A permanent magnet (magnetic force generation source) 25 is suspended in the hollow tube 20 via a wire rope (suspending member) 29. The wire rope 29 is wound around a motor-driven winding drum (not shown) provided at the top of the leader 12, and the wire rope 29 moves up and down by winding and rewinding the winding drum. The permanent magnet 25 moves up and down in the hollow tube 20.

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

First, the hollow tube 20 in which the permanent magnet 25 is installed is installed in the leader 12 of the construction machine main body 11 of the ground compaction device 10. Next, as shown in FIG. 4, the hollow tube 20 is penetrated to a predetermined depth in the soft sandy ground 1 through the lifting mechanism 15 of the construction machine main body 11. Next, the permanent magnet 25 is moved in the vertical direction in the hollow tube 20 via the wire rope 29. Thereby, the soil particles 3 containing the iron content 4 in the surrounding ground 2 penetrating the hollow tube 20 are attracted by the magnetic force of the permanent magnet 25, and the soil particles 3 not containing the iron content are attracted by the magnetic force of the permanent magnet 25. The volume of the soft ground of the surrounding ground 2 is compressed by moving the permanent magnet 8 in the vertical direction in the hollow tube 20 in the state of being moved to the vicinity of the permanent magnet 8 together with the soil particles 3 containing To increase the density and compact the soft ground.

  In this way, the soil particles 3 including the iron content 4 in the surrounding ground 2 penetrating the hollow tube 20 provided with the permanent magnet 25 are moved by the magnetic force of the permanent magnet 25, and at the same time, the soil particles 3 not including the iron content are also included. Since the soft ground of the surrounding ground 2 is compacted by moving the permanent magnet 25 in the vicinity of the hollow tube 20 provided with the permanent magnet 25, the soft ground with less vibration and displacement of the ground is provided. Can be reliably and inexpensively performed in a short time.

<Fifth Embodiment>
FIG. 6 is a cross-sectional view of a main part of a hollow pipe used in the soft sandy ground compaction method of the fifth embodiment of the present invention, and FIG. 7 shows a state in which the hollow pipe penetrates into the soft sandy ground. FIG. 8 is an explanatory view showing a state where the hollow tube is pulled out, and FIG. 9 is an explanatory view showing a state where the hollow tube is re-penetrated.

  In the soft sandy ground compaction method of the fifth embodiment, the ground compaction is performed using the ground compaction device 10 shown in FIG. 5 as in the case of the fourth embodiment.

  As shown in FIG. 6, the hollow tube (shaft) 30 has a nonmagnetic cylindrical bottom plate with at least a tip portion 30a formed of titanium or the like in a nonmagnetic cylindrical shape. It is blocked by 31. A pair of excavation bits 32, 32 project from the periphery of the circular bottom plate 31. A cylindrical electromagnet 35, a battery 36 for supplying power to the electromagnet 35, and a receiver 37 for operating the electromagnet 35 are disposed above the bottom plate 31 in the hollow tube 30 via a partition plate 38. And a wire rope (suspending member) 39 fixed to the upper end side of the hollow tube 30. The receiver 37 is remotely operated wirelessly 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.

  The hollow tube 30 provided with the electromagnet 35 attached to the leader 12 of the construction machine main body 11 of the ground compaction device 10 has no vibration and noise in the soft sandy ground 1 via the lifting mechanism 15. It is designed to penetrate and withdraw.

  Next, the compacting process of the soft sandy ground ground 1 by the soft sandy ground compaction method of the fifth embodiment will be described based on the drawings of FIGS.

  First, the hollow tube 30 in which the electromagnet 35, the battery 36, and the receiver 37 are provided is installed in the leader 12 of the construction machine main body 11 of the ground compaction device 10. Next, as shown in FIG. 7, the hollow pipe 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. At this time, the electromagnet 35 is kept in an OFF state where it does not operate.

Then, as shown in FIG. 8, the hollow tube 30 is pulled out while being reversely rotated to a predetermined height via the elevating mechanism 15 and the rotation drive mechanism 19 of the construction machine body 11 without operating the electromagnet 35. Next, as shown in FIG. 9, when the electromagnet 35 is operated (ON) and the hollow tube 30 is re-penetrated into the soft sandy ground 1, the hollow tube 30 is re-penetrated in the surrounding ground 2. The soil particles 3 containing iron 4 are attracted by the magnetic force of the electromagnet 35, and the soil particles 3 not containing iron are also moved to the vicinity of the electromagnet 35 together with the soil particles 3 containing the iron 4 attracted by the magnetic force of the electromagnet 35. In this state, by moving the hollow tube 30 downward, the volume of the soft ground of the peripheral ground 2 is compressed, the density is increased, and the soft ground of the peripheral ground 2 is compacted. The drawing and re-penetration of the hollow tube 30 are sequentially repeated up to the ground surface, and the soft ground of the entire surrounding ground 2 penetrating the hollow tube 30 is compacted.

  Thus, when the hollow pipe 30 is penetrated into the soft sandy ground 1 through the forced lifting mechanism 15 of the construction machine main body 11 or pulled out, and the hollow pipe 30 is re-entered, the surrounding ground The soil particles 3 containing iron 4 in 2 are attracted by the magnetic force of the electromagnet 35 and moved downward. At the same time, the soil particles 3 not containing iron are also moved downward, so that the soft ground of the surrounding ground 2 is compacted. Therefore, compaction of soft ground with less vibration and ground displacement can be performed reliably and at low cost in a short time.

  In addition, since the electromagnet 35, the battery 36, and the receiver 37 are provided on the distal end side in the hollow tube 30, it is not necessary to install a power supply pipe such as a hydraulic pressure. It is easy to attach and detach the hollow tube, and the small ground compaction device 10 also adds the hollow tube for addition to the hollow tube 30 so that the hollow tube 30 can be deepened underground. The soft ground can be compacted easily and at low cost.

<Sixth Embodiment>
FIG. 10 is a cross-sectional view of the main part of the double hollow tube used in the soft sandy ground compaction method of the sixth embodiment of the present invention, and FIG. 11 shows the double hollow tube penetrating into the soft sandy ground. FIG. 12 is an explanatory view showing a state where the double hollow tube is pulled out, and FIG. 13 is an explanatory view showing a state where the double hollow tube is re-penetrated.

  In the soft sandy ground compaction method of the sixth embodiment, the ground compaction is performed using the ground compaction device 10 shown in FIG. 5 as in the case of the fourth embodiment.

As shown in FIG. 10, a double hollow tube (casing pipe) 40 includes a cylindrical inner tube 41 for supplying sand, and a cylindrical shape in which at least a tip 42a covering the inner tube 41 is made of titanium or the like. And the outer tube 42. And between the front-end | tip (lower end) of the inner tube | pipe 41 and the front-end | tip (lower end) of the outer tube | pipe 42, it is obstruct | occluded with the nonmagnetic and annular | circular shaped bottom plate 43. A pair of excavation bits 44, 44 project from the periphery of the annular bottom plate 43. In addition, above the bottom plate 43 between the inner tube 41 and the outer tube 42 of the double hollow tube 40, an annular columnar electromagnet 45, a battery 46 for supplying power to the electromagnet 45, and the electromagnet 45 are operated. The receiver 47 is suspended by a wire rope (suspending member) 49 fixed to the upper end side between the inner tube 41 and the outer tube 42 of the double hollow tube 40 through an annular plate-shaped partition plate 48. It is lowered. The receiver 4 7, adapted to be remotely operated by radio by the operation panel (not shown) provided in the driver's seat or the like of the construction machine body 11 of the ground compaction device 10.

  Then, the double hollow tube 40 attached to the leader 12 of the construction machine main body 11 of the ground compaction device 10 is penetrated and pulled out into the soft sandy ground 1 through the lifting mechanism 15 without vibration and noise. It has become so. The sand (pile material) 5 is supplied to the inner tube 41 of the double hollow tube 40 via a sand supply tube (not shown).

  Next, the compacting process of the soft sandy ground ground 1 by the soft sandy ground compaction method of the sixth embodiment will be described based on the drawings of FIGS.

  First, the double hollow tube 40 in which the electromagnet 45, the battery 46, and the receiver 47 are provided between the inner tube 41 and the outer tube 42 is installed in the leader 12 of the construction machine body 11 of the ground compaction device 10. Next, as shown in FIG. 11, the double hollow tube 40 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. . At this time, a predetermined amount of sand is put into the inner tube 41 of the double hollow tube 40. Further, the electromagnet 45 is kept in an OFF state where it does not operate.

Then, as shown in FIG. 12, the double hollow tube 40 is reversely rotated to a predetermined height via the forced lifting mechanism 15 and the rotation drive mechanism 19 of the construction machine body 11 without operating the electromagnet 45, and is pulled out. The sand 5 in the inner tube 41 of the heavy hollow tube 40 is discharged. Next, as shown in FIG. 13, the electromagnet 45 is actuated (ON), the double hollow tube 40 is re-penetrated into the soft sandy ground 1, the discharged sand 5 is compacted, and the sand pile (Material pile) The soil particle 3 containing the iron content 4 in the surrounding ground 2 re-penetrating the double hollow tube 40 is moved downward by the magnetic force of the electromagnet 45, and at the same time, the soil not containing iron content. The particles 3 are moved downward together with the soil particles 3 containing iron 4 by the magnetic force of the electromagnet 45 to compress the volume of the soft ground of the surrounding ground 2 to increase its density, and tighten the soft ground of the surrounding ground 2 Solidify. The extraction and re-penetration of the double hollow tube 40 are sequentially repeated up to the ground surface, so that the surrounding soil 2 penetrating the double hollow tube 40 does not contain the sand pile S and the soil particles 3 including iron 4 and iron. The soft ground is further compacted by the movement of the soil particles 3.

  Thus, when the double hollow tube 40 is penetrated into the soft sandy ground 1 through the lifting mechanism 15 of the construction machine main body 11 or pulled out, and the double hollow tube 40 is re-penetrated. The sand pile S is created in the surrounding ground 2 and the soil particles 3 containing iron 4 and the soil particles 3 not containing iron in the surrounding ground 2 are moved downward by the magnetic force of the electromagnet 45 to tighten the soft ground. Since it is hardened, the soft ground with less vibration and ground displacement can be compacted reliably and at low cost in a short time.

  In addition, since the electromagnet 45, the battery 46, and the receiver 47 are provided on the distal end side between the inner tube 41 and the outer tube 42 of the double hollow tube 40, a power supply tube such as a hydraulic pressure is not installed. Therefore, it is easy to attach and remove the double hollow tube for addition to the double hollow tube 40, and the small ground compaction device 10 can be used to add to the double hollow tube 40. By adding the empty pipes, the double hollow pipe 40 can penetrate deeply into the ground, and the soft ground can be compacted easily and at low cost.

  Furthermore, when the surrounding ground 2 has a small amount of iron, the above-mentioned soft ground is compacted by filling the sand 5 with a material containing a large amount of iron. Thereby, when there is little iron content in the surrounding ground 2, the soft ground of the surrounding ground 2 can be more reliably compacted.

  In addition, according to the said embodiment, although the raising / lowering mechanism which raises / lowers a hollow tube etc. 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. The shaft penetrating into the ground is not limited to a hollow tube or a double hollow tube, but may be a rod-shaped body such as a metal rod. Furthermore, although sand was used as the pile material, the pile material is not limited to sand.

1 Soft sandy ground 2 Surrounding ground 3 Soil particles 4 Iron 5 Sand (pile material)
6,7,8 Electromagnet (Magnetic force source)
9 Hollow tube (shaft)
DESCRIPTION OF SYMBOLS 10 Ground compaction device 15 Elevating mechanism 20 Hollow tube 25 Permanent magnet (Magnetic force generation source)
29 Wire rope (suspending member)
30 Hollow tube (shaft)
30a Tip 35 Electromagnet 36 Battery 37 Receiver 40 Double hollow tube 41 Inner tube 42 Outer tube 45 Electromagnet 46 Battery 47 Receiver

Claims (11)

A soft sandy ground compaction method that penetrates a magnetic source through a ground compaction device into a soft sandy ground and compacts the surrounding ground that has penetrated the magnetic source,
A magnetic force of the magnetic source is generated in the soft sandy ground, and the soil particles containing iron in the surrounding ground are attracted by the magnetic force of the magnetic source, and soil particles not containing iron are also generated by the magnetic force. The volume of the soft ground of the surrounding ground is compressed by moving it in the vicinity of the magnetic force generation source together with the soil particles containing iron that are attracted by the magnetic force of the source , and the density is increased and compacted. A soft sandy ground compaction method. A soft sandy ground compaction method that penetrates a magnetic source through a ground compaction device into a soft sandy ground and compacts the surrounding ground that has penetrated the magnetic source,
A magnetic force is generated by the magnetic force generation source in the soft sandy ground, and the magnetic force generation source is moved through the ground compaction device, so that the soil particles containing iron in the surrounding ground are moved to the magnetic force generation source. together attract in the magnetic force, in a state of even soil particles not containing iron is moved in the vicinity of the magnetic force generating source together with soil particles containing the iron which is attracted by the magnetic force of the magnetic force source, the said magnetic force generating source The soft sandy ground is characterized in that by further moving through a ground compaction device, the volume of the soft ground in the vicinity of the moved magnetic force generation source is compressed, and the density is increased and compacted. Compaction method. A soft sandy ground compaction method in which a shaft is penetrated into a soft sandy ground through a ground compaction device to a predetermined depth, and the surrounding ground penetrating the shaft is compacted,
Using a shaft provided with a magnetic force generation source, penetrating the shaft to a predetermined depth in the soft sandy ground, and then generating a magnetic force from substantially the entire circumference of the shaft with the magnetic force generation source. The soil particles containing iron in the surrounding ground penetrating the shaft are attracted, and the soil particles not containing iron move to the vicinity of the shaft together with the soil particles containing iron attracted by the magnetic force of the magnetic force generation source. A soft sandy ground compaction method characterized by compressing the volume of the soft ground of the surrounding ground and increasing the density thereof . A soft sandy ground compaction method in which a hollow tube is penetrated into a soft sandy ground through a ground compaction device to a predetermined depth and the surrounding ground penetrated through the hollow tube is compacted.
A hollow tube provided with a magnetic force generation source is used, the hollow tube provided with the magnetic force generation source is penetrated to a predetermined depth in the soft sandy ground, and then the magnetic force generation source is inserted into the hollow It is moved in the vertical direction in the pipe to attract the soil particles containing iron in the surrounding ground penetrating the hollow pipe with the magnetic force of the magnetic force generation source, and the soil particles not containing iron are also attracted by the magnetic force of the magnetic force generation source. The volume of the soft ground of the surrounding ground is compressed by moving the magnetic force source in the vertical direction in the hollow tube while being moved to the vicinity of the magnetic force source together with the attracted soil particles containing iron. And the soft sandy ground compaction method, characterized by increasing its density and compacting. After penetrating the shaft to a predetermined depth via a ground compaction device in soft sandy ground , the shaft is pulled out to a predetermined height, the shaft is pulled out and re-penetrated repeatedly, and the surrounding ground penetrating the shaft is removed. In the soft sandy ground compaction method to compact,
Using a shaft provided with an electromagnet at the tip, this shaft penetrates to a predetermined depth in the soft sandy ground without operating the electromagnet, and then the shaft is pulled out to a predetermined height without operating the electromagnet Next, the electromagnet is actuated to re-penetrate the shaft into the soft sandy ground, and the soil particles containing iron in the surrounding ground re-penetrated with the shaft are attracted by the magnetic force of the electromagnet. By moving the shaft downward through the ground compaction device in a state where the soil particles not containing the iron particles are also moved to the vicinity of the electromagnet together with the iron particles containing the iron particles attracted by the magnetic force of the electromagnet. A soft sandy ground compaction method characterized by compressing the volume of the soft ground of the surrounding ground and increasing its density. After penetrating the hollow tube to a predetermined depth through a ground compaction device into the soft sandy ground , the hollow tube is pulled out to a predetermined height, and the hollow tube is pulled out and re-penetrated repeatedly, In the soft sandy ground compaction method that compacts the surrounding ground penetrating the empty pipe,
Using a double hollow tube with an electromagnet provided between the inner tube and the outer tube, a predetermined amount of pile material is put into the inner tube of this double hollow tube, and the electromagnet is operated by operating the double hollow tube. Without penetrating to the predetermined depth in the soft sandy ground, and then pulling out the double hollow tube to a predetermined height without operating the electromagnet, pile material in the inner tube of the double hollow tube Next, the electromagnet is operated to re-penetrate the double hollow tube into the soft sandy ground, and the discharged pile material is compacted to form a material pile. The soil particles containing iron in the surrounding ground that re-penetrated the heavy hollow tube are moved downward together with the soil particles not containing iron by the magnetic force of the electromagnet to compress the volume of the soft ground in the surrounding ground. The soft sandy ground compaction method, characterized by increasing its density and compacting. The soft sandy ground compaction method according to claim 6,
A soft sandy ground compaction method, wherein the pile material is filled with a high iron content when the iron content in the surrounding ground is low. In the ground compaction device used for the soft sandy ground compaction method, which penetrates the hollow pipe into the soft sandy ground to a predetermined depth and compacts the surrounding ground penetrating the hollow pipe,
A hollow tube provided with a magnetic force generation source is provided inside, and the hollow tube provided with the magnetic force generation source is freely moved into and out of the soft sandy ground by an elevating mechanism .
A ground compaction device characterized in that the magnetic force generation source can be suspended in the hollow tube by a suspension member, and the magnetic force generation source can be moved in the vertical direction in the hollow tube by the vertical movement of the suspension member . A soft sandy ground that penetrates the shaft into a soft sandy ground to a predetermined depth, then pulls out the shaft to a predetermined height, repeats the pulling out and re-penetration of the shaft, and compacts the surrounding ground that has penetrated the shaft. In the ground compaction device used for compaction method,
Provided with a shaft provided with an electromagnet at the tip, the shaft provided with this electromagnet can be penetrated and pulled out into the soft sandy ground by an elevating mechanism ,
A ground compaction device using a hollow tube as the shaft, and a battery for supplying power to the electromagnet and a receiver for operating the electromagnet are provided inside the hollow tube . After the hollow tube has penetrated to a predetermined depth in the soft sandy ground, the hollow tube is pulled out to a predetermined height, and the hollow tube is pulled out and re-penetrated to repeat the surrounding ground. In the ground compaction device used for soft sandy ground compaction method
It consists of an inner tube that supplies pile material and an outer tube that covers the inner tube, and has a double hollow tube with an electromagnet between the inner tube and the outer tube. A ground compaction device characterized in that it can be freely inserted into and pulled out from the soft sandy ground. A soil compaction apparatus according to claim 1 0, wherein,
A ground compaction device, wherein a battery for supplying power to the electromagnet and a receiver for operating the electromagnet are provided between an inner tube and an outer tube of the double hollow tube.

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