JP6702678B2 - Deformation detector for ground improvement wing - Google Patents

Description

The present invention relates to a soil improvement device with a stirring blade, which relates to a soil improvement device rotation detection device for detecting and monitoring the rotation of the soil improvement blade. More specifically, the present invention relates to a soil improvement device for preventing soil rotation of excavated soil, which relates to a rotation detection device for soil improvement blades for detecting relative rotation between a rotation prevention blade and a stirring blade. ..

Various methods have been proposed as construction methods for ground improvement, but a drilling hole is formed in the ground, a coagulant such as cement is injected into the excavated soil, and the mixture is mixed and stirred by a stirring blade to solidify the pile, etc. The method of forming the soil improvement pillar is known and constructed. When mixing and stirring with the stirring blades, the stirring blades and the improved soil may be integrated into a lump and be circulated together. In order to prevent this rotation, it is also known to provide a rotation prevention blade having a structure in which a bearing on a rotating rod is freely rotated, and fix the rotation prevention blade to the wall surface of the excavation hole during construction.

However, even with the ground agitating blade having this structure, the anti-rotation blade and the agitating blade may rotate together, and there is no guarantee that the anti-rotation blade and the agitating blade do not rotate relative to each other. For this reason, it has been proposed that the relative rotation speed between the anti-rotation blade and the stirring blade is detected by a sensor and is monitored (Patent Documents 1 and 2).

The device described in Patent Document 1 transmits a signal from a sensor that detects the rotation of the anti-rotation blade to the ground as a radio signal emitted from a transmitting device. The radio signal is received by the receiving device on the ground. The detection device described in Patent Document 2 sends a signal from a sensor that detects the rotation of the anti-rotation blades underground to the ground through a transmission wire in the rotating rod, and then to a counter device via a slip ring at the upper end of the rotating rod. Connected.

JP 2000-144703 A JP, 2001-323454, A

However, when a wireless signal is transmitted from the transmitter installed at the lower end of the rotating rod to the ground and is received by the receiver, the wireless signal passes through the ground and is attenuated. The deeper the excavation depth, the thicker the ground that passes through, and in some cases, the presence of rock formations may prevent the reception of radio signals. Further, when the slip ring at the upper end of the rotating rod is started and a signal is taken out, the rotating rod rotates and it is limited to the wire connection structure up to the transmission signal counter.

The present invention has been made under the technical background as described above, and achieves the following objects.
It is an object of the present invention to provide a ground improvement blade accompaniment detection device that detects a rotation state of a rotation prevention blade and reliably transmits a detection signal to a ground receiving device in a ground improvement device having a stirring blade. It is in.
Another object of the present invention is, in a ground improvement device having a stirring blade, a rotation improvement device for a ground improvement blade that detects relative rotation between a non-rotating blade and a stirring blade and transmits a detection signal to a ground receiving device. To provide.

The present invention adopts the following means in order to achieve the above object.
The present invention, in a ground improvement device having a ground stirring blade to excavate a drilling hole to improve the ground in the drilling hole, the ground of the ground improving device for detecting and monitoring the rotation of the ground improving blade. This is a combined wing detection device.

The substation detection device for ground improvement wing according to Invention 1 of the present invention is
A ground improvement device having a ground stirring rotor, which excavates an excavation hole to improve the soil in the excavation hole,
A single shaft that is driven to rotate by a rotation driving device and has a discharge hole for discharging the ground improvement material,
A stirring blade fixed to this single shaft, which stirs the excavated soil excavated in the excavation hole,
A drill bit provided at the end of the ground bottom side of the single shaft and having a plurality of drilling blades for drilling the drilling hole,
It is rotatably provided on the single shaft between the stirring blade and the drill bit, and the outer peripheral end portion is engaged with the peripheral wall of the drilling hole to stop rotation, and the stirring blade and the drill bit are In a soil improvement device comprising an anti-rotation blade for mixing and stirring excavated soil excavated by rotating relative to rotation with the soil improvement material,
In order to detect the relative rotation between the single shaft and the anti-rotation blade, a detection object arranged on the anti-rotation blade and a detection unit arranged on the single shaft corresponding to the detection object And a sensor
An electric wire for transmitting a relative rotation signal due to relative rotation of the single shaft and the non-rotation prevention blade detected by the sensor, to an upper portion of the single shaft,
It is arranged on the upper part of the single shaft and comprises a wireless means for converting the relative rotation signal into a wireless signal ,
The electric wire is connected by a non-contact terminal arranged on the single shaft,
The wireless means is arranged to be mounted on a rotating part of a water swivel provided at an upper end of the single shaft in order to continuously feed the ground improvement material into the rotating single shaft. To do.

A ground improvement wing subrotation detection device according to a second aspect of the present invention is the same as the first aspect, wherein the detected body is a magnet, and the detection means is a coil. When rotating, the magnetic flux of the magnetic field of the magnet passing through the coil changes, and a voltage due to electromagnetic induction is generated in the coil to generate the relative rotation signal.
In a ground improvement wing subrotation detection device according to a third aspect of the present invention, in the second aspect, the magnet is fixed to an upper end or a lower end of a blade body of the anti-rotation wing, and the coil is fixed to the bearing. It is characterized by

In a second aspect of the present invention, there is provided a ground improvement wing subrotation detecting device according to the second aspect, wherein in the magnet, the subrotation preventing wing is fixed to an inner peripheral surface of a blade body, and the coil is provided to an outer peripheral surface of the bearing. The magnet is fixed so as to face the magnet.
In the ground improvement wing sub-rotation detection device of the fifth aspect of the present invention, in the first aspect, the wire is a ZigBee (registered trademark) standard-compliant ZigBee Coordinator and ZigBee End Device, or a ZigBee Coordinator, ZigBee Router and ZigBee End. It is characterized by being connected by Device.

According to the present invention, the following effects are exhibited. According to the present invention, it has become possible for the manager or operator of the ground improvement device to recognize the rotation by detecting the rotation of the non-rotation prevention blade of the ground improvement device. Also, since the wireless communication is used, it is possible to monitor the rotation of the anti-rotation wing even at a place away from the ground improvement device.

FIG. 1 is an external view showing a stirring head A according to a first embodiment of the present invention. FIG. 2 is an external view showing the upper part of the rotary rod that drives the stirring head A in the first embodiment of the present invention. FIG. 3 is a vertical cross-sectional view of the rotating rod according to the first embodiment of the present invention. FIG. 4 is an enlarged view of a broken line portion of the vertical sectional view of the rotating rod of FIG. 3 in the first embodiment of the present invention. FIG. 5 illustrates an example of installing the sensor 25 and the magnet 24 according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line AA′ of FIG. 3 in the first embodiment of the present invention. FIG. 7 is a block diagram showing an outline of the sub-rotation detection device 20 of the ground improvement wing according to the first embodiment of the present invention. FIG. 8 is a block diagram illustrating an outline of the wireless transmitter 22 according to the first embodiment of this invention. FIG. 9: is the figure which showed an example which displays the rotation condition of the non-rotation prevention blade 4 of the 1st Embodiment of this invention on the screen of the receiver 26. As shown in FIG. FIG. 10 is a conceptual diagram showing a state in which the non-contact terminals 27a and 27b are provided at the connecting portion of the upper end single shaft and the lower end single shaft in the third embodiment of the present invention. In the fourth embodiment of the present invention, FIG. 11 shows a ZC (ZigBee Coordinator) 60 and a ZED (ZigBee End Device) 62 provided at the connecting portion of the upper end single axis and the lower end single axis, and the cables 23a and 23b are connected. It is a conceptual diagram which shows a mode that it does.

[First Embodiment]
Next, a first embodiment of the present invention will be described with reference to the drawings. Although not shown in the drawings, the sub-conditioning detection device for a ground improvement wing according to the present invention (hereinafter referred to as the sub-direction detection device) is incorporated into an improved main body of the ground improvement device that is movable on the ground to operate. That is, the rotary rod is connected to the drive motor provided in the improvement machine body, and the stirring head A of the ground improvement apparatus is rotationally driven by the rotary rod that is rotated by the rotational drive of the drive motor.

The ground is excavated by the drill bit 2 at the tip of the stirring head A, and the excavated soil is transferred upward. The mixing blades 3a and 3b fixed to the single shaft 1 of the stirring head A and the non-rotating blades 4 rotatably provided on the single shaft 1 mix the excavated soil with the ground improvement material while stirring the mixed soil. To Here, the stirring blades 3a and 3b and the anti-rotation blade 4 function as a ground improvement blade. FIG. 1 is an external view showing the external appearance of a stirring head A according to the first embodiment of the present invention, and FIG. 2 is an external view showing the upper part of a rotating rod that drives the stirring head A.

FIG. 3 is a vertical cross-sectional view of the lower portion of the rotating rod of the stirring head A. As can be understood from this longitudinal sectional view, the rotary shaft of the present embodiment is a tubular single shaft 1 and is not a double pipe. A drill bit 2 is arranged on the ground bottom side of the single shaft 1, and the drill bit 2 is driven to rotate integrally with the single shaft 1 by driving a drive motor (not shown) that drives the single shaft 1. .. The drilling bit 2 has a rotating outer diameter that matches the outer diameter of the ground improvement column (inner diameter of the excavation hole 5).

In the drill bit 2, a plurality of blade portions 2a are arranged on a straight line in the radial direction of the drill bit 2, and this is advanced while excavating while lowering the lower surface of the ground bottom of the ground improvement column. A discharge hole 8 for pouring the ground improvement material into the excavation hole is arranged at the tip of the single shaft 1 near the drill bit 2. The ground improvement material is supplied from a supply unit on the ground through the hollow portion 1a of the pipe arranged at the center of the single shaft 1, and is discharged into the excavated hole 5 on the ground bottom side.

On the upper part of the drill bit 2, there is provided a stirring blade 3b which is a blade which is integrally fixed to the single shaft 1 by welding and is provided in the radial direction. That is, the stirring blade 3b is composed of two blades each having a twisted plate shape, and the two blades are arranged to face each other with the single shaft 1 interposed therebetween in the radial direction. On the single shaft 1 above the stirring blade 3b, the stirring blade 3a having the same structure but different in 90 degree angular phase is arranged. A bearing 7 is fixed to the unitary shaft 1 between the drill bit 2 and the stirring blade 3b arranged at the lower part of the unitary shaft 1.

The anti-rotation blade 4 is rotatably provided on the bearing 7. This non-rotation prevention blade 4 has two plate-shaped blades extending in the radial direction of 180 degrees by fastening bolts 6 with the single shaft 1 interposed therebetween, and the blade surface of the non-rotation prevention blade 4 is excavated. The holes 5 are arranged parallel to the center line direction. The outer peripheral tip portion 4a of the non-rotating blade 4 bites into the excavation hole 5 in the vertical direction and comes into contact therewith. That is, the tip of the tip portion 4a of the anti-rotation blade 4 is set to have a diameter larger than the rotational circle locus of the drill bit 2.

[Water swivel 10]
A water swivel 10 is mounted on the top of the single shaft 1. The water swivel 10 is a joint for continuously supplying the ground improvement material to the rotating single shaft 1. Therefore, the water swivel 10 includes a part that rotates integrally with the single shaft 1, a shaft that does not rotate, a bearing, a seal part, and the like. This structure and function are publicly known, and the description thereof will be omitted.

The rotating part of the water swivel 10 is integral with the single shaft 1 and rotates together. A radio 22 (see FIG. 7) that receives a detection signal from a sensor 25 described later and transmits the detection signal to the outside is mounted on the rotating part of the water swivel 10. A hose locking member 11 is integrally provided on the fixed portion of the water swivel 10. The hose locking member 11 fixes a hose that supplies the ground improvement material.

[Example of ground improvement method]
Next, a method of performing ground improvement by the ground improvement device will be described. When penetrating into the ground, the single shaft 1 is rotated in the normal direction by the drive device of the ground improvement machine. This rotation moves the excavated soil, which has been excavated by the drill bit 2 and the plurality of blades of the blade body 2a, into the ground to the upper side.

With the progress of the ground penetration, the central portion of the anti-rotation blade 4 is rotatably supported on the bearing 7, but the outer peripheral end circular locus of the anti-rotation blade 4 is set larger than the excavation hole 5. Therefore, during excavation, the outer peripheral end portion 4a of the anti-rotation blade 4 bites into the inner peripheral wall surface of the excavation hole 5, and the anti-rotation blade 4 stops rotating. Since the drill bit 2 and the stirring blades 3a and 3b continue to excavate, the anti-rotation blade 4 is in a relative rotation state, that is, only the anti-rotation blade 4 is in the rotation stop state, and the surface of the excavation hole 5 is It advances in the excavation direction while biting in the direction of the rotation axis.

At the same time, the ground improvement material is injected and discharged from the discharge holes 8. The excavated soil excavated by this injection is agitated by the agitating blades 3a and 3b and the anti-rotation vane 4 simultaneously with the excavation, becomes mixed soil with the ground improvement material, and is gradually brought upward as it is agitated. .. In this agitation, the excavated soil is agitated between the rotating agitating blades 3a and 3b and the non-rotating sub-rotation preventing blade 4, and is agitated while convection occurs in the rotation direction and the vertical direction. The structure and function of the stirring head A described above are known techniques.

[Ground Improvement Wing Deflection Detection Device]
In the stirring head A described above, a first embodiment of the ground rotation wing under rotation detection device 20 will be described. FIG. 7 is a block diagram showing the outline of the sub-rotation detecting device 20 for the ground improvement wing. The ground improvement wing subrotation detection device 20 includes a detection unit 21 for detecting the rotation of the subrotation prevention wing 4 and outputting a detection signal, a wireless transmitter 22 for transmitting the detection signal to a user, and both of which are connected to each other. An electric wire 23 for receiving the detection signal, a receiving device 26 for receiving the detection signal, performing signal processing and displaying the signal, and the like.

Each part will be described in detail. The detection unit 21 is for detecting the rotation of the anti-rotation blade 4, and includes a magnet 24 installed on the anti-rotation blade 4 and a sensor 25 installed in the lower end of the single shaft 1. The sensor 25 is connected to the electric wire 23 and transmits a detection signal to the wireless transmitter 22. Since the magnet 24 is fixed to the anti-rotation blade 4 and the sensor 25 is fixed to the single shaft 1, the detection signal indicates relative rotation between the anti-rotation blade 4 and the single shaft. The absolute rotation of the anti-rotation blade 4 is determined by subtracting the detected relative rotation speed from the rotation speed of the single shaft 1.

The sensor 25 is a sensor for detecting a change in the magnetic flux of the magnet 24 based on the principle of electromagnetic induction. The sensor 25 is not limited to the principle of electromagnetic induction, and a sensor having a known principle and structure can be used, but some examples will be shown here. For example, the sensor 25 is composed of a coil, and when the magnet 24 passes near the sensor 25, the magnetic flux of the magnet 24 changes across the coil, so that an induced electromotive voltage is generated in the coil and becomes a detection signal. As shown in FIG. 3 and FIG. 4, which is a partially enlarged view of the magnet 24 and the sensor 25, the magnet 24 is installed on the blade body of the anti-rotation blade 4, and the sensor 25 is installed on the bearing 7.

The electric wire 23 is installed in the inter-pipe hollow portion 1b which is the hollow portion between the pipes in the tubular single shaft 1 (see FIGS. 3 and 6). In order to install the electric wire 23 from the single shaft 1 to the bearing 7, a through hole 1c and a through hole 7a are provided as shown in FIG. The through hole 1c is a hole that penetrates through the pipe wall at the lower end of the single shaft 1, and is connected to the inter-pipe hollow portion 1b and penetrates to the bearing 7. The electric wire 23 passes through the through hole 1c. The through hole 7a is a through hole or a through hole provided in the bearing 7, and the electric wire 23 and the sensor 25 connected to the tip of the electric wire 23 are installed in the through hole 7a, as shown in an enlarged view in FIG.

A sensor 25 is installed at the bottom of the through hole 7a. As shown in FIGS. 3 and 4, the magnet 24 is installed in the groove 4 a provided at the upper end of the blade body of the anti-rotation blade 4. The magnet 24 and the sensor 25 are arranged so as to face each other. Since the blade body and blade surface of the anti-rotation blade 4 are constantly in contact with the excavated soil and the ground improvement material, it is preferable that the magnet 24 is installed so as not to protrude from the blade surface as much as possible. It is preferable to seal with a filler or the like so as not to enter.

The magnet 24 is preferably a permanent magnet such as a ferrite magnet, a neodymium magnet, or samarium cobalt, and in particular, it is preferable to use a neodymium magnet having characteristics that it has high hardness, high durability against impact, and has a strong magnetic force. The magnet 24 is fixed to the blade surface by a mechanical fixing means such as a bolt (not shown). Further, the magnet 24 may be fixed to the blade surface with an adhesive. If the magnet 24 is fixed to the blade surface with an adhesive, no additional parts are required and the cost is low. Since the magnet 24 is fixed to the blade surface of the anti-rotation blade 4, when the anti-rotation blade 4 rotates, the magnet 24 rotates together with it.

[Wireless transmitter 22]
FIG. 8 is a block diagram showing an outline of the wireless transmitter 22. The radio transmitter 22 is mounted in the water swivel 10, especially in its rotating part. The wireless transmitter 22 can be used as an analog communication device or a digital communication device as long as it has a function of receiving a detection signal from the detection unit 21 and transmitting it by wireless communication. The structure and function of the wireless transmitter 22 will be described with reference to FIG. The wireless transmitter 22 includes a wireless transmitter main body 30 and an antenna 37 which are housed in a housing (not shown).

The wireless transmitter main body 30 is a device for performing signal processing on a detection signal detected by the sensor 25 and transmitting the signal by wireless communication. The wireless transmitter main body 30 is a central processing unit (CPU) 31 for executing a predetermined command and controlling the entire apparatus, a memory 32 for storing a control program and data including the command, and a communication unit 33 for controlling communication. , A receiving unit 34 for receiving the detection signal and converting it into a digital signal. The wireless transmitter 22 has a power supply unit 36 from a battery installed in the wireless transmitter main body 30 or a power supply unit 39 separated from the wireless transmitter main body 30.

The power supply unit 36 and the power supply unit 39 are secondary power storage devices for supplying power to the wireless transmitter main body 30, and the secondary power storage devices are alkaline batteries, lithium ion batteries, and the like. The power supply unit 39 can also use a solar cell or the like. In this case, the solar cell is installed outside the water swivel 10. The wireless transmitter 22 has a connection terminal 38 for connecting the electric wire 23 in order to receive the detection signal of the sensor 25. The connection terminal 38 is connected to the receiving unit 34, so that the receiving unit 34 receives the detection signal of the sensor 25.

The detection signal is signal-processed by the reception unit 34, digitized, converted into a digital detection signal, and sent to the transmission unit 33. The transmitter 33 converts this digital detection signal for communication and transmits it as a wireless signal from the antenna 37. The radio signal transmitted from the antenna 37 is received and processed by the reception device 26. The receiving device 26 receives the radio signal, processes the signal, and displays the rotation status of the anti-rotation wing 4. It is premised that the sensor 25 rotates with the single shaft 1 and the magnet 24 is basically stationary with the anti-rotation vane 4.

When the anti-rotation blade 4 is stationary as described above, the sensor 25 passes through the magnet 24 at the same cycle as the rotation speed of the single shaft 1. Therefore, the relative speed obtained from the detection signal detected by the sensor 25 is the single shaft. It is the same as the rotation speed of 1. The rotation speed of the anti-rotation blade 4 becomes 0 when the relative speed obtained from the rotation speed of the single shaft 1 is subtracted from this value. When the anti-rotation blade 4 rotates, the anti-rotation blade 4 has a lower rotation speed than the single shaft 1. At this time, the detection signal detected by the sensor 25 has a lower rotation speed than the rotation speed of the single shaft 1.

This is because the anti-rotation blade 4 rotates in the direction of the single shaft 1. The relative speed obtained from the detection signal is lower than the rotation speed of the single shaft 1. The rotation speed of the anti-rotation blade 4 is obtained by subtracting this rotation speed obtained from the rotation speed of the single shaft 1. In this example, the receiving device 26 uses a general-purpose electronic computer such as a personal computer, a tablet terminal, or a smartphone. As the rotation status of the anti-winging blade 4, whether the anti-winging blade 4 is rotating, the rotation speed, or the like is displayed.

FIG. 9 shows an example of displaying the rotation state of the anti-rotation blade 4. The display area 50 of FIG. 9 is displayed on the screen of the receiving device 26, and includes a basic information area 51, a display area 52 for displaying the rotation status of the anti-rotation blade 4, and the like. The basic information area 51 is for displaying information on a construction site when using the ground improvement device, and is a construction site showing the name of the place where construction is being performed, a person showing the name of a construction worker or an excavation worker, The construction period indicating the construction period, the start time on the day indicating the start time of the current work, and the like are displayed.

The display area 52 is an area showing the situation of the anti-rotation blade 4. The rotation status indicating whether or not the non-rotation prevention blade 4 is rotating, the rotation speed indicating the speed of rotation, the rotation direction indicating the direction of rotation, and the depth of the excavation hole 5 in which the rotation prevention blade 4 is located are shown. Excavation depth etc. are displayed in this area. Further, in the display area 52, there is a graph area 53 which is graphically displayed for easy viewing of the rotation state of the anti-rotation blade 4.

As an example, the graph area 53 displays the rotation status of the non-rotation prevention blade as a graph with the rotation speed on the elapsed time axis. In the example of the graph region 53, the horizontal axis represents the elapsed time and the vertical axis represents the rotation speed of the anti-rotation blade 4. This rotation speed is obtained by subtracting the relative speed obtained from the detection signal detected by the sensor 25 from the rotation speed of the single shaft 1. In the example of the graph area 53, the elapsed time on the horizontal axis is displayed at predetermined intervals by performing signal processing on the detection data from the sensor 25.

The elapsed time may be displayed in real time the rotation speed of the anti-rotation blade 4 obtained from the detection signal of the sensor 25, or may be displayed at the time interval at which the detection signal of the sensor 25 is received. This is set according to the worker's request, work site, etc. In the display area 50 of FIG. 9, in addition to the above-mentioned data, weather information at the site, information such as the type of ground, information about the depth and radius of the drill bit 2, the number of revolutions of the drive motor and the rotating rod, Data such as the information of the stirring head A, the strength of the detection signal of the sensor 25, the strength of the wireless signal, and the like can be displayed.

In this example, the receiving device 26 is a general-purpose computer having a central processing unit, a memory, and an input/output device. However, the receiving device 26 processes a wireless signal from the wireless transmitter 22 and, at a minimum, a non-rotation prevention wing. Any device can be used as long as it displays the rotation status of 4 in a manner that is easy for the user to understand. For example, a simple electronic device that displays only the presence or absence of rotation of the anti-rotation blade 4 or the status of its rotation speed may be used.

[Second Embodiment]
A second embodiment of the present invention will be described. The second embodiment of the present invention is basically the same as the above-described first embodiment, and only different parts will be described. FIG. 5 illustrates an example of installing the sensor 25 and the magnet 24. As shown in FIG. 5, a through hole is provided at the lower end of the single shaft 1 so as to communicate with the bearing 7, and the electric wire 23 is passed through the through hole.

A small hole 4b is provided at a position in the middle of the blade body of the anti-rotation blade 4 that comes into contact with the bearing 7, and the magnet 24 is installed. The sensor 25 is installed on the outer surface of the bearing 7 and on the portion of the anti-rotation blade 4 that comes into contact with the blade body so as to face the magnet 24. For that purpose, a through hole 7b is provided in the bearing 7, an electric wire 23 is installed in the through hole 7b, and a sensor 25 is installed at the tip thereof.

[Third Embodiment]
A third embodiment of the present invention will be described. The third embodiment of the present invention is basically the same as the first and second embodiments described above, and only different parts will be described. When the unit shaft 1 is long, as shown in FIG. 10, it is composed of an upper unit shaft and a lower unit shaft, and the upper unit shaft and the lower unit shaft may be connected in a male-female form.

At this connection portion, the hollow portion 1b between pipes, which is the hollow portion between the pipes in the single shaft 1, is not continuous, but the lower end portion of the upper end single shaft and the upper end portion of the lower end single shaft come into contact with each other and have a predetermined thickness. It becomes the metal wall 1d. In this portion, a through hole (not shown) is provided so that the electric wire 23 can pass through. Further, as shown in FIG. 10, recesses 1e and 1f are provided at the lower end of the upper end single shaft and the upper end of the lower end single shaft, respectively, and non-contact terminals 27a and 27b connected to the electric wire 23 are provided.

[Fourth Embodiment]
A fourth embodiment of the present invention will be described. The fourth embodiment of the present invention is basically the same as the above-described third embodiment, and only different parts will be described. When the unit shaft 1 is long, as shown in FIGS. 10 and 11, the upper unit shaft and the lower unit shaft may be connected, and the upper unit shaft and the lower unit shaft may be connected in a male and female form. This connecting portion becomes a metal wall 1d having a predetermined thickness, which is indicated by reference numeral 1d in FIG.

Recesses 1e and 1f are provided in the lower end of the upper end single shaft and the upper end of the lower end single shaft, respectively, and a ZigBee Coordinator (hereinafter referred to as ZC) 60 and a ZigBee End Device (hereinafter referred to as ZED) 62 are installed. , Send a detection signal. The ZED 62 is connected to the sensor 25 by the electric wire 23b, and the ZC 60 is connected to the wireless transmitter 22 by the electric wire 23a. The ZED 62 receives the detection signal detected by the sensor 25. The ZED 62 transmits the received detection signal to the ZC 60 by wireless communication.

The ZC 60 transmits the detection signal received from the ZED 62 to the wireless transmitter 22. The wireless communication between ZC60 and ZED62 is performed by the antenna 63 and the antenna 61 respectively connected. The ZC60 and ZED62 are communication devices compliant with the short-range wireless communication standard ZigBee (registered trademark). ZigBee is standardized as IEEE 802.15.4 in the specifications of the lowest physical layer and data link layer among the seven layers of the communication protocol based on the OSI reference model established by the International Organization for Standardization (ISO). ing.

ZigBee has the characteristics of short communication data transfer distance, low transfer speed, and low power consumption. ZigBee-compliant devices are inexpensive and consume less power, so they have the advantage of being usable over a long period of time, and are mainly used for sensor networks. ZigBee-compliant devices operate in the frequency bands of 2.4 GHz, 902-928 MHz and 868-870 MHz.

ZC60 and ZED62 are a wireless circuit for controlling wireless communication, a microcomputer for controlling the entire device, a memory for storing data, and a peripheral circuit for controlling communication with an external device connected to the device. , An internal antenna for wireless communication with an external device, and an external antenna connector for connecting an antenna for wireless communication with an external device. The microcomputer includes a central processing unit (CPU), RAM, flash memory and the like.

The ZC60 and ZED62 include a power supply connector for supplying necessary power to the device, a serial input/output connector for data communication, an analog input/output connector, a digital input/output connector, a pulse input/output connector, and the like. Since the present invention is not a ZigBee-compliant device invention, an outline of operation using the ZC60 and ZED62 will be described, and detailed description of the internal structure and operation thereof will be omitted. The sensor 25 is connected to the input connector of the ZED 62.

The antenna 63 is connected to the external antenna connector of the ZED 62, and the battery 64 is connected to the power connector of the ZED 62. Specifically, the ZED 62 is mounted and fixed on the substrate 65, and the power connector of the ZED 62 is connected to the battery connection terminal of the substrate 65. The battery 64 is fixed to the substrate 65, and its electrode is connected to the battery connection terminal of the substrate 65. Therefore, the battery 64 is connected to the power supply connector of the ZED 62. The battery 64 may be any battery, but is preferably a small button battery.

If a button battery is used, in one example, a device having a size of a small coin (for example, a 1-yen coin) can be formed. The ZED 62, the battery 64, the substrate 65, and the antenna 63 are integrally stored in the housing 66. Depending on the sizes of the ZED 62 and the substrate 65 including the case 66, a general-purpose device having a size of about 1 to 1.5 cm can be produced. The ZED 62 receives a detection signal from the sensor 25 at intervals of milliseconds to several seconds and tens of seconds. Depending on the usage environment, such button batteries can be powered by standard ZigBee devices for at least a few days to a few months.

Further, the ZED 62 can operate according to the request received from the ZC 60 and receive the detection signal from the sensor 25. The ZED 62, the battery 64, the antenna 63, and the substrate 65 are housed in the housing 66 and mounted on the upper end of the lower end single shaft. The radio transmitter 22 of the ZC60 is connected to its output connector by an electric wire 23a. The antenna 61 is connected to the external antenna connector of the ZC60, and power is supplied from the wireless transmitter 22 to the power connector of the ZC60 by the electric wire 23a.

The electric wire 23a preferably includes a communication wire for data communication and an electric wire for supplying power. The ZC 60 and the antenna 61 are housed in a housing 67 and mounted on the lower end of the upper end single shaft. Further, power can be supplied to the power connector of the ZC60 by a button battery as in the ZED62 (not shown). The ZC 60 wirelessly communicates with the antenna 63 of the ZED 62 by the antenna 61, receives the detection signal, and transmits it to the wireless transmitter 22. The ZC 60 also receives a detection signal from the ZED 62 at a preset interval.

Alternatively, when the wireless transmitter 22 requests the detection signal, the ZC 60 transmits a request to the ZED 62, receives the detection signal from the ZED 62 as a response, and transmits this to the wireless transmitter 22. As described above, the ZC 60 and the ZED 62 use the external antennas 61 and 63 because they have good reception sensitivity, but if sufficient reception sensitivity can be realized, a built-in antenna (not shown) is used. be able to.

As described above, the data communication by the pair of ZC60 and ZED62 conforming to the ZigBee standard has been described, but a ZigBee Router (ZR) that is a device for relaying data between the ZC60 and ZED62 can be used. The ZR having the same structure as the ZC60 can be used and is set as a router. The ZC60 is mounted in the vicinity of the wireless transmitter 22 by being connected to the wireless transmitter 22 by an electric wire, and the ZR is mounted on the lower end portion of the single upper end shaft. In other words, the ZR is mounted at the position of ZC60 shown in FIG.

The ZC 60 is mounted in the vicinity of the wireless transmitter 22 in the water swivel 10 or in the hollow portion 1a of the single shaft 1 below the water swivel 10. Like the ZED 62, the ZR has a structure of a button battery with an antenna and a substrate. Upon receiving the request from ZC60, ZR transmits the detection signal of ZED62 to ZC60. As described above, the ZC60, ZED62, and ZR can use a match stick antenna or a wire antenna as an external antenna.

A... Stirring head 1... Single shaft 2... Drilling bit 3a, 3b... Stirring blade 4... Winding prevention blade 5... Drilling hole 8... Discharge hole 10... Water swivel 20... Winding detection device 21... Detection unit 22... Wireless Transmitter 23... Electric wire 26... Receiving device 24... Magnet 25... Sensor 37... Antenna 60... ZigBee Coordinator (ZC)
62...ZigBee End Device (ZED)

Claims (5)

A ground improvement device having a ground stirring rotor, which excavates an excavation hole to improve the soil in the excavation hole,
A single shaft that is driven to rotate by a rotation driving device and has a discharge hole for discharging the ground improvement material,
A stirring blade fixed to this single shaft, which stirs the excavated soil excavated in the excavation hole,
A drill bit provided at the end of the ground bottom side of the single shaft and having a plurality of drilling blades for drilling the drilling hole,
It is rotatably provided on the single shaft between the stirring blade and the drill bit, and the outer peripheral end portion is engaged with the peripheral wall of the drilling hole to stop rotation, and the stirring blade and the drill bit are In a soil improvement device comprising an anti-rotation blade for mixing and stirring excavated soil excavated by rotating relative to rotation with the soil improvement material,
In order to detect the relative rotation between the single shaft and the anti-rotation blade, a detection object arranged on the anti-rotation blade and a detection unit arranged on the single shaft corresponding to the detection object And a sensor
An electric wire for transmitting a relative rotation signal due to relative rotation of the single shaft and the non-rotation prevention blade detected by the sensor, to an upper portion of the single shaft,
It is arranged on the upper part of the single shaft and comprises a wireless means for converting the relative rotation signal into a wireless signal,
The electric wire is connected by a non-contact terminal arranged on the single shaft,
The wireless means is arranged to be mounted on a rotating part of a water swivel provided at an upper end of the single shaft in order to continuously feed the ground improvement material into the rotating single shaft. Deformation detector for ground improvement wing. The submersion detection device for ground improvement wing according to claim 1,
The detected body is composed of a magnet, and the detection means is composed of a coil,
When the single shaft and the anti-rotation blade rotate relative to each other, the magnetic flux of the magnetic field by the magnet passing through the coil changes, and a voltage due to electromagnetic induction is generated in the coil to become the relative rotation signal. A characteristic of the improved wing detection device for ground improvement wings. The submergence detection device for ground improvement wing according to claim 2,
The magnet is fixed to the upper end or the lower end of the blade body of the anti-rotation blade,
The coil is fixed to the bearing. The submergence detection device for ground improvement wing according to claim 2,
The magnet, the anti-rotation blade is fixed to the inner peripheral surface of the blade body,
The said coil is fixed to the outer peripheral surface of the said bearing so that it may oppose the said magnet. The subrotation detection apparatus of the ground improvement wing characterized by the above-mentioned. The submersion detection device for ground improvement wing according to claim 1,
The said electric wire is connected by ZigBee Coordinator and ZigBee End Device or ZigBee Coordinator, ZigBee Router and ZigBee End Device that comply with the ZigBee (registered trademark) standard.

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