Ground improvement systems and construction equipment

Abstract

A ground improvement system is provided that can supply power to a battery in a casing pipe and appropriately control a driving device. [Solution] The ground improvement system 10 is a ground improvement system 10 that constructs pillar-shaped structures and includes a control device 20 and a construction device 30. The construction device 30 includes a casing pipe 33 that penetrates the ground and a rotation drive device 32 that controls the rotation of the casing pipe 33. The construction device 30 also includes a lifting device 31 that controls the elevation of the casing pipe 33, a wireless power transmitting unit 230, and a wireless power receiving unit 330 that receives power wirelessly transmitted from the wireless power transmitting unit 230. The construction device 30 also includes a first battery 320 that stores the power received by the wireless power receiving unit 330, and a first communication control unit 310 that controls a drive device 340 and a sensor 350 that are driven based on the power stored in the first battery 320.

Description

[Technical Field]

[0001] The present invention relates to a ground improvement system and a construction device. [Background technology]

[0002] In a conventional method for compacting the surrounding ground by constructing sand piles underground, a technique has been proposed in which a casing filled with granular material such as sand or crushed stone is inserted to a predetermined depth and the material inside the casing is appropriately discharged into the ground. Patent Document 1 discloses a compaction ground improvement method using a ground improvement system equipped with a casing pipe. The compaction ground improvement method disclosed in Patent Document 1 involves penetrating a casing pipe into the ground to a predetermined depth while rotating it, discharging the sand material, and then driving it back in to create a compacted sand pile. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-105455 Summary of the Invention [Problem to be solved by the invention]

[0004] The casing pipe of the ground improvement system used in the compaction ground improvement method disclosed in Patent Document 1 is mechanically connected to a rotary drive device and an elevator device, and is a device that penetrates into the ground while rotating using the force transmitted from the rotary drive device and the elevator device. Therefore, during ground improvement work, it is difficult to collect construction data from the casing pipe in real time, control the drive device attached to the casing pipe, supply power, etc.

[0005] The present invention has been made in view of the problems inherent in the prior art, and an object of the present invention is to provide a ground improvement system that can supply power to the battery of the casing pipe and appropriately control the drive device. [Means for solving the problem]

[0006] A ground improvement system according to an embodiment of the present invention is a ground improvement system that uses a construction method of compacting the ground by constructing pillar-shaped objects underground to drive a construction device under control from a control device to construct pillar-shaped objects.The construction device comprises a casing pipe that penetrates the ground, a rotary drive device that is located at a position in contact with the upper longitudinal end of the casing pipe and controls the rotation of the casing pipe, a lifting device that controls the raising and lowering of the casing pipe, a wireless power transmission unit, a wireless power receiving unit that receives power wirelessly transmitted from the wireless power receiving unit, a first battery that stores the power received by the wireless power receiving unit, and a first communication control unit that controls the drive device and sensor that operate based on the power stored in the first battery.The control device comprises a second communication control unit that sends a control signal to the first communication control unit of the construction device based on user input, a control panel that controls the lifting device and rotary drive device provided in the construction device based on user operation instructions, and a second battery that transmits power to the wireless power transmission unit.

[0007] Another aspect of the present invention relates to a construction device that is driven by control from a control device to create pillar-shaped structures in a method of compacting the ground by creating pillar-shaped structures underground, and that includes a casing pipe that penetrates the ground, a rotary drive device that is located at a position in contact with the upper longitudinal end of the casing pipe and controls the rotation of the casing pipe, a lifting device that controls the raising and lowering of the casing pipe, a wireless power transmitting unit that wirelessly transmits power sent from the control device or power source, a wireless power receiving unit that receives power wirelessly transmitted from the wireless power transmitting unit, a first battery that stores the power received by the wireless power receiving unit, and a first communication control unit that controls a drive device and a sensor that operate based on the power stored in the first battery. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a ground improvement system that can supply power to the battery of the casing pipe and appropriately control the drive device. [Brief explanation of the drawings]

[0009] [Figure 1] This is a diagram for explaining the compaction method using sand pile driving in the ground improvement system of this embodiment. [Figure 2] FIG. 10 is a diagram for explaining a compaction method using sand pile installation. [Figure 3] FIG. 1 is a block diagram showing the configuration of a ground improvement system according to this embodiment. [Figure 4] FIG. 2 is a schematic diagram for explaining wireless power supply in the ground improvement system according to the present embodiment. [Figure 5] FIG. 2 is a schematic diagram for explaining wireless power supply in the ground improvement system according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The ground improvement system 10 according to this embodiment will be described in detail below with reference to the drawings. Note that the dimensional proportions in the drawings are exaggerated for the sake of explanation and may differ from the actual proportions.

[0011] (Compaction method using sand piles) 1 is a diagram for explaining a compaction method using sand pile driving in a ground improvement system 10 according to this embodiment. The method to which the ground improvement system 10 is applied in this embodiment is a method in which pillar-shaped objects are constructed in the ground and the ground is compacted using the ground improvement system 10, which is a compaction pile construction machine.

[0012] The ground improvement system 10 includes a control device 20 and a construction device 30. Specifically, the ground improvement system 10 drives the construction device 30 under control of the control device 20 based on operation instructions from a user, etc., to construct compaction piles.

[0013] The method of compacting the ground by constructing pillars underground corresponds to, for example, the sand compaction pile method, sand drain method, or static compaction method, which involves driving back granular material discharged into the ground using a casing to expand the pile diameter and compact the surrounding ground. The method may also be a press-in static compaction method or compaction grouting method, in which a mixture of granular material with a fluidizing agent and cement is injected into the ground.

[0014] The control device 20 of the ground improvement system 10 includes a wireless system operation panel 100, an operation panel 200, a wireless communication system (second communication control unit 110), a control panel 210, and a second battery 220. Details of the wireless system operation panel 100, the operation panel 200, the wireless communication system (second communication control unit 110), the control panel 210, and the second battery 220 will be described later.

[0015] The construction device 30 of the ground improvement system 10 includes a lifting device 31, a rotary drive device 32, a casing pipe 33 that penetrates the ground, and a hopper 34. The hopper 34 is provided at the upper end of the longitudinal direction of the casing pipe 33, and is a portion for introducing granular material into the casing pipe 33. In this embodiment, the granular material is, for example, sand.

[0016] The lifting device 31 has a lifting motor and a power transmission means for transmitting the rotational force of the lifting motor to the casing pipe 33, and raises and lowers the casing pipe 33 into the ground. In other words, the lifting device 31 controls the raising and lowering of the casing pipe 33. The lifting device 31 is also provided with a hydraulic sensor (not shown) that detects the hydraulic pressure during the raising and lowering operation of the casing pipe 33. The lifting device 31 is also provided with a depth gauge (not shown) that detects the depth of the lower end of the casing pipe 33.

[0017] The rotation drive device 32 is equipped with a rotation motor and is a mechanism for rotating the casing pipe 33 in any direction. That is, the rotation drive device 32 is provided at a position in contact with the upper end of the casing pipe 33 in the longitudinal direction, and controls the rotation of the casing pipe 33. The rotation drive device 32 is also provided with a current sensor (not shown) that detects the current value of the rotation motor.

[0018] The ground improvement system 10 penetrates a casing pipe 33 into the ground to a predetermined depth using a lifting device 31 and a rotary drive device 32. The ground improvement system 10 also discharges granular material from the lower end of the casing pipe 33, and compacts the discharged granular material by repeating the process of pulling out and re-penetrating the casing pipe 33. The construction device 30 may also be equipped with a device (speedometer) that measures the penetration speed when the casing pipe 33 is penetrated into the ground.

[0019] In the example shown in Figure 1, a casing pipe 33 attached to a construction device 30 is penetrated to a predetermined depth into the ground by a lifting device 31 and a rotary drive device 32, and then fine waving is performed to expand the diameter of the pile body and simultaneously increase the N-value between the piles. The N-value is a numerical value that serves as a reference for determining the compaction and strength of the soil.

[0020] Figure 2 is a diagram illustrating the construction method. In step A in Figure 2, the casing pipe 33 is placed in a predetermined position, and a certain amount of sand is poured in through a hopper 34. In step B, the casing pipe 33 is rotated by the rotary drive device 32 while being penetrated into the ground. In step C, it is penetrated to a predetermined depth. In step D, the casing pipe 33 is raised to a specified height while the sand inside the casing pipe 33 is discharged. In step E, the casing pipe 33 is driven back, and the discharged sand and the surrounding ground are compacted. In step F, construction is carried out by wave construction, in which steps D and E are repeatedly performed in small increments to expand the diameter.

[0021] As described above, the casing pipe 33 is mechanically connected to the rotary drive device 32 and penetrates into the ground while rotating due to the force transmitted from the lifting device 31 and the rotary drive device 32. Therefore, in conventional ground improvement systems, the rotation of the casing pipe, which is a rotating body, must be stopped in order to send power and control signals to the casing pipe. Furthermore, in configurations in which measuring devices such as sensors are attached to the casing pipe, the rotation of the casing pipe, which is a rotating body, must also be stopped when checking acquired data. Therefore, in conventional configurations, it is difficult to collect data from the casing pipe in real time, control the drive device attached to the casing pipe, and supply power during ground improvement work.

[0022] The ground improvement system 10 of this embodiment makes it possible to appropriately control the drive unit 340 in the above-mentioned ground compaction method by supplying power to the casing pipe 33, for example, during breaks or when the machine is stopped at night.

[0023] (Configuration of Ground Improvement System 10) Next, a description will be given of the details of this ground improvement system 10. Fig. 3 is a block diagram showing the configuration of the ground improvement system 10 according to this embodiment. The ground improvement system 10 includes a control device 20 and a construction device 30.

[0024] (Configuration of control device 20) 3, the control device 20 includes a wireless system operation panel 100 and an operation panel 200. The wireless system operation panel 100 is configured by, for example, a touch panel or a switch box, and transmits and receives data to and from the construction device 30 via a wireless communication system (second communication control unit 110). The second communication control unit 110 corresponds to the wireless communication system shown in FIG. 3.

[0025] The wireless system operation panel 100 acquires information input by a user's operation, which is information related to the control of the construction device 30. The user corresponds to the operator of the compaction pile construction machine, which is the ground improvement system 10. The information input by the user is sent to the construction device 30 via the second communication control unit 110.

[0026] Furthermore, the user may obtain information acquired by the sensor 350 provided in the construction device 30 via the second communication control unit 110. In this case, the information acquired via the second communication control unit 110 may be configured to be displayed on the wireless system operation panel 100 so that the user can obtain the information. Alternatively, the information acquired via the second communication control unit 110 may be configured to be acquired via a display device (not shown) such as a display connected to the second communication control unit 110.

[0027] The operation panel 200 is connected to a control panel 210 that controls the lifting device 31, the rotary drive device 32, and the hopper 34. The control panel 210 sends information input by user operation to the lifting device 31, the rotary drive device 32, and the hopper 34, which are provided on the upper part of the casing of the construction device 30, as control signals to the lifting device 31, the rotary drive device 32, and the hopper 34. In addition, the second battery 220 is a device for storing power to be supplied to the construction device 30.

[0028] (Configuration of construction device 30) 3, the construction device 30 includes a lifting device 31, a rotation drive device 32, a casing pipe 33, and a hopper 34. In this embodiment, the construction device 30 also includes a wireless power transmission unit 230.

[0029] The casing pipe 33 is equipped with an installation control unit 300. The installation control unit 300 includes a first communication control unit 310, a first battery 320, a wireless power receiving unit 330, a drive unit 340, and a sensor 350. The sensor 350 corresponds to the oil pressure sensor, depth gauge, current sensor, and / or speedometer described above. In addition, the first communication control unit 310 corresponds to the wireless communication system in which the installation control unit 300 is provided in FIG. 3.

[0030] The first communication control unit 310 of the construction control unit 300 transmits and receives data via wireless communication with the second communication control unit 110. Specifically, the first communication control unit 310 of the construction control unit 300 drives the drive device 340 in response to a control instruction from the second communication control unit 110. The first communication control unit 310 of the construction control unit 300 also transmits data acquired by the sensor 350 to the second communication control unit 110. In other words, the first communication control unit 310 and the second communication control unit 110 can communicate with each other via wireless communication, and data is transmitted and received in both directions.

[0031] The first battery 320 is a battery that stores power received by wireless power feeding from the control device 20 via the wireless power transmitting unit 230 and the wireless power receiving unit 330. Based on the power stored in this first battery 320, the first communication control unit 310, the driving device 340, and the sensor 350 are driven.

[0032] Fig. 4 is a diagram for explaining wireless power supply in the ground improvement system 10 according to this embodiment, and is a diagram that schematically shows a side view of the lifting device 31, the rotary drive device 32, and a part of the casing pipe 33. Fig. 5 is a diagram for explaining wireless power supply in the ground improvement system 10 according to this embodiment, and is a diagram that schematically shows a plan view of the rotary drive device 32 as seen from above.

[0033] 4 and 5, the casing pipe 33 is provided on its side with a power transmission unit 331 that is connected to the wireless power receiving unit 330 and receives power received by the wireless power receiving unit 330. That is, the wireless power receiving unit 330 is provided on the side of the casing pipe 33 via the power transmission unit 331. The wireless power transmitting unit 230 is provided at a position spaced a predetermined distance from the wireless power receiving unit 330.

[0034] 5, when the wireless power transmitting unit 230 and the wireless power receiving unit 330 face each other, wireless power transmission (wireless power feeding) is performed from the wireless power transmitting unit 230 to the wireless power receiving unit 330. Therefore, when the casing pipe 33, which is a rotating body, and the casing pipe 33 are stationary, power feeding to the casing pipe 33 is performed at a predetermined timing.

[0035] That is, the ground improvement system 10 according to this embodiment is capable of supplying power to the first battery 320 of the construction control unit 300 provided in the casing pipe 33. Furthermore, the ground improvement system 10 is capable of controlling (driving) the driving device 340 provided in the casing pipe 33 in real time and collecting data from the sensor 350, based on the power supplied to the casing pipe 33 and stored in the first battery. That is, in the ground improvement system 10 according to this embodiment, the driving device 340 and the sensor 350 can be driven when the casing pipe 33 is rotating.

[0036] The wireless power supply (wireless power transmission) method according to this embodiment applies a high-frequency electromagnetic coupling method using a general electromagnetic induction. Wireless power supply methods include a high-frequency electromagnetic coupling method using electromagnetic induction, a magnetic resonance method, an electric field coupling method, and a microwave wireless method. By applying the high-frequency electromagnetic coupling method as the wireless power supply method according to this embodiment, it is possible to realize wireless power supply with superior environmental resistance to noise, dirt, etc., and high power supply efficiency compared to other methods.

[0037] As described above, the ground improvement system 10 according to this embodiment is a ground improvement system 10 that drives a construction device 30 to construct pillars under control of a control device 20 in a construction method for compacting the ground by constructing pillars underground. The construction device 30 includes a casing pipe 33 that penetrates the ground, a rotation drive device 32 that is provided at a position in contact with the upper end of the casing pipe 33 in the longitudinal direction and controls the rotation of the casing pipe 33, and an elevation device 31 that controls the elevation of the casing pipe 33. The construction device 30 also includes a wireless power transmitting unit 230 and a wireless power receiving unit 330 that receives power wirelessly transmitted from the wireless power transmitting unit 230. The construction device 30 also includes a first battery 320 that stores the power received by the wireless power receiving unit 330, and a first communication control unit 310 that controls a drive device 340 and a sensor 350 that are operated based on the power stored in the first battery 320. The control device 20 includes a second communication control unit 110 that sends a control signal to a first communication control unit 310 of the construction device 30 in response to a user's input. The control device 20 also includes a control panel 210 that controls the lifting device 31 and the rotation drive device 32 provided in the construction device 30 in response to a user's operation instruction, and a second battery 220 that transmits power to the wireless power transmission unit 230.

[0038] As a result, the ground improvement system 10 of this embodiment can appropriately control the drive device 340 based on the electricity supplied to the casing pipe 33 and charged to the battery, even when the casing pipe 33 is in operation.

[0039] The wireless power receiving unit 330 may be provided on the side of the casing pipe 33 via a power transmitting unit 331. Furthermore, the wireless power transmitting unit 230 may be provided at a position separated by a predetermined distance from the wireless power receiving unit 330. This makes it possible for the ground improvement system 10 according to this embodiment to supply power to the casing pipe 33 both when the casing pipe 33 is moving and when it is stationary. In other words, the ground improvement system 10 can supply power to the first battery 320 of the construction control unit 300 provided on the casing pipe 33 without stopping the rotation of the casing pipe 33, which is a rotating body.

[0040] The first communication control unit 310 and the second communication control unit 110 may be able to communicate with each other via wireless communication. This allows the ground improvement system 10 according to this embodiment to drive the driving device 340 even when the casing pipe 33 is rotating. Furthermore, the ground improvement system 10 can recognize information acquired by the sensor 350 via the first communication control unit 310 and the second communication control unit 110 even when the casing pipe 33 is rotating.

[0041] Power may be supplied by the wireless power transmitting unit 230 and the wireless power receiving unit 330 using a high-frequency electromagnetic coupling power supply system. As a result, the ground improvement system 10 according to this embodiment employs the high-frequency electromagnetic coupling system, which makes it possible to realize wireless power supply with excellent environmental resistance to noise, dirt, etc., and high power supply efficiency compared to other systems.

[0042] (Other embodiments) Although the embodiments have been described in detail with reference to the drawings, the present embodiments are not limited to the contents described in the above embodiments. Furthermore, the components described above include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the configurations described above can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configurations can be made without departing from the spirit of the embodiments.

[0043] In the above-described embodiment, a configuration has been shown in which power is supplied to the battery of the casing pipe 33 and charged during breaks or when the machine is stopped at night, thereby enabling real-time control of the drive device 340 and data collection. However, the supply of power to the battery of the casing pipe 33 is not limited to when the machine is stopped at breaks or night. For example, a trolley-type configuration that can supply power while the machine is rotating may also be used. This makes it possible to supply power to the battery of the casing pipe 33 in real time.

[0044] Furthermore, in the above-described embodiment, a configuration has been shown in which power stored in the second battery 220 provided in the control device 20 is transmitted to the wireless power transmission unit 230 of the construction device 30, but this configuration does not limit the configuration of the embodiment. For example, if a power source is provided near the ground improvement system 10, the power source and the wireless power transmission unit 230 of the construction device 30 may be connected by a power line, and power may be transmitted directly from the power source to the wireless power transmission unit 230 of the construction device 30. In this configuration, there is no need to provide the second battery 220 in the control device 20, and it is possible to reduce the number of steps, such as charging the second battery 220.

[0045] (Actions, effects, etc.) The effects of this embodiment will be described below.

[0046] (1) A ground improvement system 10 according to a first aspect of this embodiment is a ground improvement system 10 that drives a construction device 30 to construct pillars under control of a control device 20 in a construction method for compacting the ground by constructing pillars underground. The construction device 30 includes a casing pipe 33 that penetrates the ground, a rotation drive device 32 that is provided at a position in contact with the upper end of the casing pipe 33 in the longitudinal direction and controls the rotation of the casing pipe 33, and an elevation device 31 that controls the elevation of the casing pipe 33. The construction device 30 also includes a wireless power transmitting unit 230 and a wireless power receiving unit 330 that receives power wirelessly transmitted from the wireless power transmitting unit 230. The construction device 30 also includes a first battery 320 that stores the power received by the wireless power receiving unit 330, and a first communication control unit 310 that controls a drive device 340 and a sensor 350 that are operated based on the power stored in the first battery 320. The control device 20 includes a second communication control unit 110 that sends a control signal to a first communication control unit 310 of the construction device 30 in response to a user's input. The control device 20 also includes a control panel 210 that controls the lifting device 31 and the rotation drive device 32 provided in the construction device 30 in response to a user's operation instruction, and a second battery 220 that transmits power to the wireless power transmission unit 230.

[0047] With this configuration, the ground improvement system 10 can appropriately control the drive device 340 based on the electricity supplied to the casing pipe 33 and charged to the battery, even when the casing pipe 33 is in operation.

[0048] (2) The wireless power receiving unit 330 of the ground improvement system 10 according to the second aspect of this embodiment may be provided on the side of the casing pipe 33 via the power transmitting unit 331. In addition, the wireless power transmitting unit 230 may be provided at a position separated from the wireless power receiving unit 330 by a predetermined distance.

[0049] This configuration enables the ground improvement system 10 to supply power to the casing pipe 33 both when the casing pipe 33 is moving and when it is stationary. That is, the ground improvement system 10 can supply power to the first battery 320 of the construction control unit 300 provided in the casing pipe 33 without stopping the rotation of the casing pipe 33, which is a rotating body.

[0050] (3) The first communication control unit 310 and the second communication control unit 110 of the soil improvement system 10 according to the third aspect of this embodiment may be capable of communicating with each other via wireless communication.

[0051] This configuration enables the ground improvement system 10 to drive the driving device 340 even when the casing pipe 33 is rotating. Also, the ground improvement system 10 can recognize the information acquired by the sensor 350 via the first communication control unit 310 and the second communication control unit 110 even when the casing pipe 33 is rotating.

[0052] (4) Power supply by the wireless power transmitting unit 230 and the wireless power receiving unit 330 of the ground improvement system 10 according to the fourth aspect of this embodiment may be implemented by a high-frequency electromagnetic coupling type power supply method.

[0053] With this configuration, the ground improvement system 10 applies a high-frequency electromagnetic coupling method, which makes it possible to achieve wireless power supply with high power supply efficiency and superior environmental resistance to noise and dirt compared to other methods.

[0054] (5) A construction device 30 according to a fifth aspect of this embodiment is a construction device 30 that is driven by control from the control device 20 to construct pillars in a construction method of compacting the ground by constructing pillars underground. The construction device 30 includes a casing pipe 33 that penetrates the ground, a rotation drive device 32 that is provided at a position in contact with the upper end of the casing pipe 33 in the longitudinal direction and controls the rotation of the casing pipe 33, and an elevation device 31 that controls the elevation of the casing pipe 33. The construction device 30 also includes a wireless power transmission unit 230 that wirelessly transmits power sent from the control device 20 or a power source, and a wireless power receiving unit 330 that receives power wirelessly transmitted from the wireless power transmission unit 230. The construction device 30 also includes a first battery 320 that stores the power received by the wireless power receiving unit 330, and a first communication control unit 310 that controls a drive unit 340 and a sensor 350 that operate based on the power stored in the first battery 320.

[0055] With this configuration, even when the casing pipe 33 is being driven, the construction device 30 can appropriately control the drive device 340 based on the power supplied to the casing pipe 33 and charged in the battery. [Explanation of symbols]

[0056] 10 Ground Improvement System 20 Control device 30 Construction equipment 31 Lifting device 32 Rotational drive unit 33 Casing pipe 34 Hopper 100 Wireless system control panel 110 Second communication control unit 200 Control panel 210 Control Panel 220 Second Battery 230 Wireless Power Transmission Unit 300 Construction Control Unit 310 First communication control unit 320 First Battery 330 Wireless power receiving unit 331 Power Transmission Section 340 Drive Unit 350 sensors

Claims

1. In a construction method for compacting the ground by constructing pillars underground, a ground improvement system is provided in which a construction device is driven by control from a control device to construct the pillars, The construction device is a casing pipe that penetrates the ground; a rotation drive device provided at a position in contact with an upper end of the casing pipe in the longitudinal direction and configured to control the rotation of the casing pipe; a lifting device for controlling the lifting and lowering of the casing pipe; a wireless power transmission unit; a wireless power receiving unit that receives power wirelessly transmitted from the wireless power transmitting unit; a first battery that stores the power received by the wireless power receiving unit; a first communication control unit that controls a drive device and a sensor that are driven based on the power stored in the first battery, The control device A second communication control unit that sends a control signal to the first communication control unit of the construction device in response to a user input; a control panel that controls the lifting device and the rotation drive device provided in the construction device in response to an operation instruction from the user; a second battery that transmits power to the wireless power transmitting unit, Ground improvement system.

2. the wireless power receiving unit is provided on a side of the casing pipe via a power transmission unit, The ground improvement system according to claim 1 , wherein the wireless power transmitting unit is provided at a position separated by a predetermined distance from the wireless power receiving unit.

3. The ground improvement system according to claim 1 , wherein the first communication control unit and the second communication control unit are capable of communicating with each other via wireless communication.

4. The ground improvement system according to any one of claims 1 to 3, wherein power supply by the wireless power transmitting unit and the wireless power receiving unit is carried out by a high-frequency electromagnetic coupling power supply method.

5. In a construction method for compacting the ground by constructing pillar-shaped objects underground, a construction device that is driven by control from a control device and constructs the pillars, The construction device is a casing pipe that penetrates the ground; a rotation drive device provided at a position in contact with an upper end of the casing pipe in the longitudinal direction and configured to control the rotation of the casing pipe; a lifting device for controlling the lifting and lowering of the casing pipe; a wireless power transmission unit that wirelessly transmits power sent from the control device or a power source; a wireless power receiving unit that receives power wirelessly transmitted from the wireless power transmitting unit; a first battery that stores the power received by the wireless power receiving unit; a first communication control unit that controls a drive device and a sensor that are driven based on the power stored in the first battery.

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