JP6626972B2 - Specific resistance detection device using ground improvement wing - Google Patents

Description

  The present invention relates to a specific resistance detection device using a ground improvement wing. More specifically, the present invention relates to a specific resistance detecting device using a ground improvement blade for monitoring changes in the ground in a ground improvement device having a rotation preventing blade and a stirring blade. More specifically, the present invention relates to a specific resistance detection device using a ground improvement wing for monitoring a change in the ground by detecting and monitoring the specific resistance of the ground improvement excavated soil.

  Various methods have been proposed as a construction method for improving the ground.However, a drilling hole is formed in the ground, a solidified material such as cement is poured into the excavated soil of the drilling hole, and the mixture is stirred and solidified by a stirring blade. There is known a method of forming ground improvement columns such as piles. At the time of the construction, in particular, the stirring blade and the improved soil may be integrally formed into a lump to be carried around. In order to prevent this rotation, there is also known a construction method in which a rotation prevention blade having a structure that can freely rotate by a bearing on a rotating rod is provided, and the rotation prevention blade is fixed to a wall surface of a drilled hole during construction.

  Under such circumstances, when mixing and stirring the coagulant and excavated soil with the stirring blade, we want to understand how the properties of the ground are changing and whether the excavated soil and the ground improvement material are properly agitated There is a request. A specific resistance measurement sensor is installed on the peripheral surface of the hollow rod between the drilling wing and the lower stirring blade, and the specific resistance in the vicinity is measured to grasp the mixed state of the excavated soil and solidified material in real time. It has been proposed to do this (Patent Document 1).

  The technology of measuring the physical properties of the ground using its specific resistance (electrical resistance) is a well-known technology generally used for excavation of oil and hot springs, investigation of groundwater, and the like. When measuring the physical properties of the ground with the specific resistance using the specific resistance, two electrodes are basically installed at the measurement target, the electric current flows, and the electric potential is measured with the other two electrodes installed around it. I do. From the measured current and voltage, a resistance value is obtained using Ohm's law or the like. Since the resistance varies depending on the physical properties between the electrodes, the specific resistance is used for measuring the physical properties of the ground. When the distance between the electrodes and the type of ground are the same, and when other conditions such as moisture are the same, the specific resistance becomes the same. The type of the ground can be specified from the change in the specific resistance.

JP 2010-24675 A

  However, in the conventional one, a specific resistance measuring sensor is installed on the peripheral surface of the hollow rod, and since the rod is constantly in contact with the ground improvement material while rotating, the specific resistance measuring sensor is worn, or There is a problem of peeling. In addition, since the specific resistance measurement sensor and the electrode are installed adjacent to the peripheral surface of the hollow rod, the specific resistance measurement sensors on the ground are close to each other and accurately detect changes in the surrounding ground improvement material. Can not.

The present invention has been made based on the background art as described above, and achieves the following objects.
SUMMARY OF THE INVENTION An object of the present invention is to provide a specific resistance detecting device using a ground improvement wing, which monitors changes in improved soil, ground, and the like, in a ground improvement device having a rotation preventing blade and a stirring blade.

  Another object of the present invention is to measure a specific resistance value of an improved soil, a ground, etc., in a ground improvement device having a rotation prevention blade and a stirring blade, using a specific resistance detection electrode installed on the rotation prevention blade. Another object of the present invention is to provide a specific resistance detection device using a ground improvement wing that transmits a detection signal to a computer on the ground.

  Another object of the present invention is to provide a ground improvement device having a rotation prevention blade and a stirring blade, in which a detection signal measured by a specific resistance detection electrode installed on the rotation prevention blade is signal-processed by a computer, and the specific resistance value is calculated. Another object of the present invention is to provide a specific resistance detection device using a ground improvement wing, which observes the improved soil, the ground, and the like from the rate of change.

  Another object of the present invention is to provide a ground improvement device having a counter-rotating wing and a stirring blade, wherein a specific resistance detection electrode installed on the counter-rotating wing is used to improve the specific resistance of the improved soil in the digging hole and the digging hole. It is an object of the present invention to provide a specific resistance detecting device using a ground improvement wing, which can detect a specific resistance of an outer ground and can observe a ground improvement work online.

The present invention employs the following means to achieve the above object.
The specific resistance detecting device using the ground improvement wing of Invention 1 of the present invention includes:
A ground improvement apparatus for digging a ground and digging a digging hole, mixing the digged excavated soil and a ground improvement material, and improving the ground in the digging hole,
A single shaft having a discharge hole for discharging the ground improvement material, which is rotationally driven by a rotary driving device,
A wing body fixed to the single shaft, for stirring the excavated soil and the ground improvement material in the excavation hole,
A drill bit that is provided at an end on the ground bottom side of the single shaft and has a plurality of drill blades and drills the drill hole.
The excavated soil that is rotatably provided on the single shaft, an outer peripheral end of which is engaged with a peripheral wall of the excavation hole, is stopped from rotating, and is excavated by rotating relative to the rotation of the wing body and the drilling bit. And a counter-rotating wing that mixes and stirs with the ground improvement material.
In order to measure physical properties of the ground or the improved soil obtained by mixing the excavated soil and the ground improvement material, an electrode installed on the circling prevention wing and a measuring unit connected to the electrode, wherein A specific resistance measuring means for measuring a first specific resistance which is a specific resistance and / or a second specific resistance which is a specific resistance of the improved soil and outputting a measurement signal;
Connected to said resistivity measuring means, Ri Do and a communication means for transmitting the measurement signal ground or on top of the single shaft
The electrode is installed on a portion of the counter-rotating wing located on the outer periphery of the excavation hole in order to measure the specific resistance of the ground on the outer periphery of the excavation hole.

The specific resistance detection device using the ground improvement wing of Invention 2 of the present invention is the specific resistance detection device according to Invention 1.
Receiving the measurement signal from the communication means and calculating the first specific resistance and / or the second specific resistance and / or the change rate of the first specific resistance and / or the second specific resistance from the ground or It is characterized by comprising a judgment means for judging the physical properties of the improved soil and outputting a judgment result signal, and a display means for displaying the judgment result signal on a display.

The specific resistance detecting device using the ground improvement wing according to the third aspect of the present invention,
The determination means is characterized by making a determination based on an absolute value of the first specific resistance and / or the second specific resistance, or a change rate of the first specific resistance and / or the second specific resistance.

In the specific resistance detecting device using the ground improvement wing of the fourth aspect of the present invention, in the second or third aspect, the specific resistance measuring means converts analog data of the measurement signal detected by the electrode into digital data and converts the analog data into digital data. It is characterized by having data processing means for transmitting to the communication means.

  The specific resistance detecting device using the ground improvement wing according to Invention 5 of the present invention is the invention according to any of Inventions 1 to 3, wherein the electrode is located in the excavation hole for measuring the specific resistance of the improved soil. It is characterized by being installed in the part of the prevention wing.

In the resistivity detector using the ground improvement wing of the sixth aspect, in the fourth aspect, the resistivity detector is disposed above the single axis, and receives the measurement signal from the communication unit to perform the measurement. A wireless communication unit for converting a signal into a wireless signal and transmitting the signal to the determination unit is provided.

In the specific resistance detecting device using the ground improvement wing of the seventh invention, in the sixth invention,
The communication means includes: (a) a receiving means installed in a lower end of the single shaft for receiving the measurement signal from the resistivity measuring means; and (b) a hollow portion between pipes in the single shaft. And an electric wire for transmitting the measurement signal from the receiving means to the wireless communication means.

In the specific resistance detecting device using the ground improvement wing of the eighth invention, in the sixth invention,
The communication means is provided in the lower end of the single shaft, is connected to the resistivity measurement means, receives the measurement signal from the resistivity measurement means, and transmits the measurement signal to the radio communication means by wireless communication. It is a wireless relay means.

The specific resistance detecting device using the ground improvement wing of the ninth aspect of the present invention is the specific resistance detecting device according to the eighth aspect, wherein the communication means is a ZigBee Coordinator and a ZigBee End Device or a ZigBee Coordinator based on ZigBee (registered trademark) of a short-range wireless communication standard . It is a ZigBee Router and ZigBee End Device.

A tenth aspect of the present invention is the specific resistance detecting device using the ground improvement wing according to the eighth aspect, wherein the communication means conforms to a Bluetooth (registered trademark) standard of a short-range wireless communication standard .

In the eleventh aspect of the present invention, in the specific resistance detecting device using the ground improvement wing according to the sixth aspect , the wireless communication means includes an upper end of the single shaft for continuously feeding the ground improvement material into the rotating single shaft. And a water swivel fixed to the water swivel.

In a twelfth aspect of the present invention, the electric resistance detecting apparatus using the ground improvement wing is characterized in that, in the seventh aspect , the electric wires are connected by electromagnetic connection terminals at a connection portion of the single shaft.

In the specific resistance detecting device using the ground improvement wing according to a thirteenth aspect, in the sixth aspect , the communication means is for communicating with the wireless communication means by magnetic resonance coupling, and includes a second coil. The means is for communicating with the communication means by magnetic resonance coupling, and is characterized by comprising a wireless signal receiving means comprising a first coil.

In a thirteenth aspect of the present invention, in the thirteenth aspect, the first coil is fixed to an upper end of the single shaft in order to continuously send the ground improvement material into the single shaft. A water swivel, or a hose locking member that supplies the ground improvement material, and is installed. The second coil is wound around the outer circumference of the single shaft with the counter-rotating wing. It is characterized by being arranged.

Resistivity sensing device using a ground improvement blade of the present invention 15 is the invention 1 to 14, wherein the test rotation preventing blade is cross-shaped.

  According to the present invention, using a specific resistance detection electrode installed to monitor changes in the ground on the rotation prevention wing, the specific resistance of the ground is detected, a detection signal is transmitted to a computer on the ground, and the ground improvement material It is now possible to measure and monitor ground improvement works in real time, such as whether the soil and excavated soil are optimally mixed and whether they have landed on the support layer. In addition, the detection signal detected by the specific resistance detection electrode installed on the anti-rotation wing is processed by a computer, and the change in the ground of the excavated ground can be observed from the change in the specific resistance.

FIG. 1 is an external view showing a stirring head A according to the first embodiment of the present invention. FIG. 2 is an external view showing an upper part of a rotating rod for driving the stirring head A in the first embodiment of the present invention. FIG. 3 is a vertical cross-sectional view of the lower part of the rotating rod of the stirring head A in the first embodiment of the present invention. FIG. 4 is a diagram showing a state in which the electrode 9 is installed on the anti-rotational wing 4 in the first embodiment of the present invention, and FIG. (B) is a front view of the turning prevention blade 4. FIG. 5 is a block diagram showing an outline of the ground change monitoring device 20 constituting the present invention. FIG. 6 is a block diagram showing an outline of the receiver 25 in the ground change monitoring device 20 constituting the present invention. FIG. 7 is a flowchart showing an example of measuring the specific resistance by the ground change monitoring device 20 constituting the present invention. FIG. 8 is a diagram illustrating the electrical connection of the electrodes 9 according to the first embodiment of the present invention. FIG. 9 is a diagram conceptually illustrating a point electrode buried underground. FIG. 10 is a diagram illustrating an example in which two current electrodes and two potential electrodes are arranged in a square shape. FIG. 10A is a plan view, and FIG. 10B is a cross-sectional view. . FIG. 11 is a diagram illustrating an example in which the electrode 9 is provided at the center of the blade body 4a of the rotation prevention wing 4 in the first embodiment of the present invention. FIG. 12 is a diagram schematically illustrating a ground change monitoring device according to the third embodiment of this invention. FIG. 13 is a diagram illustrating an example of an installation position of the specific resistance measurement unit 50 of the ground change monitoring device according to the third embodiment of this invention. FIG. 14 is a diagram illustrating an example of an installation position of the communication unit 51 of the ground change monitoring device according to the third embodiment of this invention. FIG. 15 is a diagram illustrating an arrangement example of the electrodes 9 of the ground change monitoring device according to the third embodiment of the present invention. FIG. 16 is a graph showing an example of data obtained by measuring specific resistance by the ground change monitoring device according to the third embodiment of the present invention. FIG. 17 is a circuit diagram illustrating an example of a magnetic field resonance circuit of the ground change monitoring device according to the third embodiment of this invention. FIG. 18 is a block diagram illustrating an outline of a circuit example of the magnetic field resonance coupling communication of the ground change monitoring device according to the third embodiment of the present invention. FIG. FIG. 18B is a block diagram illustrating a configuration example of the receiving circuit 75. FIG. 19 is a block diagram illustrating an outline of the specific resistance signal processing unit 52 of the ground change monitoring device according to the third embodiment of this invention. FIG. 20 is a block diagram illustrating an outline of a circuit example of the magnetic field resonance coupling communication of the ground change monitoring device according to the fourth embodiment of this invention.

[First Embodiment]
Next, a first embodiment of the present invention will be described with reference to the drawings. Although not shown, the ground change monitoring device 20 of the present invention is incorporated in an improved machine body of a ground improvement device movable on the ground and operates. That is, a rotating rod is connected to an output shaft of a driving motor provided in the main body of the improvement machine, and the stirring head A of the ground improvement apparatus is rotationally driven by a rotating rod driven by the driving motor. FIG. 1 is an external view showing an appearance of the stirring head A, and FIG. 2 is an external view showing an upper part of a rotating rod for driving the stirring head A. With the drill bit 2 at the tip of the stirring head A, the ground to be improved is excavated by rotary driving, and the excavated soil is transferred upward.

  Then, the excavated soil is mixed with the ground improving material while stirring the excavated soil by the stirring blades 3 a and 3 b fixed to the single shaft 1 of the stirring head A and the rotation prevention blade 4 rotatably provided on the single shaft 1. Make mixed soil. Here, the stirring blades 3a and 3b and the rotation prevention blade 4 function as ground improvement blades. FIG. 3 is a longitudinal sectional view when the lower part of the rotating rod of the stirring head A is cut. As can be understood from this longitudinal sectional view, the rotating shaft of the present embodiment is a tubular single shaft 1, not a so-called double tube. A drill bit 2 is arranged on the ground bottom side of the single shaft 1, and the drill bit 2 is rotated integrally with the single shaft 1 by driving a drive motor (not shown) for driving the single shaft 1. . The drilling bit 2 has a rotation outer diameter that matches the outer diameter (the inner diameter of the excavation hole 5) of the ground improvement column formed in the ground.

  The drill bit 2 has a plurality of blades 2a arranged linearly in the radial direction of the drill bit 2. This drills forward into the ground below while shaving the lower surface of the ground bottom of the ground improvement column. I do. A discharge hole 8 for injecting the ground improvement material into the excavation hole is disposed at the tip of the single shaft 1 near the drill bit 2. The ground improvement material is supplied from a supply device on the ground through a hollow portion 1a of a pipe disposed at the center of the single shaft 1, and is discharged into a drilled hole 5 on the bottom of the ground. At the upper part of the drill bit 2, there is provided a stirring blade 3 b which is a blade which is fixed to the single shaft 1 by welding at one end and which is provided in a 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. A stirring blade 3a having a similar structure with a different 90-degree angle phase is disposed on the single shaft 1 above the stirring blade 3b (see FIG. 1). A bearing 7 is fixed to the single shaft 1 between the drill bit 2 disposed below the single shaft 1 and the stirring blade 3b. The antirotation wing 4 is rotatably provided on the bearing 7. 4A and 4B are views showing a state in which the electrode 9 is installed on the anti-rotational wing 4. FIG. 4A is a plan view of the anti-rotational wing 4, and FIG. FIG.

  In this example, the four blade-shaped wings 4a extend in the radial direction at 90 degrees to each other by the bolts 6 with the single shaft 1 interposed therebetween. The blade surface is arranged in parallel with the center line direction of the excavation hole 5. Thereby, the center part 4b of the blade body 4a forms 1/4 of a cylinder as shown by the inner peripheral surface 4c (see FIG. 4). The center 4b of the four blades 4a forms one cylinder. The outer peripheral end 4d of the outer periphery of the co-rotation prevention wing 4 is adapted to bite into the excavation hole 5 in a vertical direction (see FIG. 1).

  That is, the outer diameter of the tip of the outer peripheral end 4 d of the co-rotation prevention blade 4 is set to be larger than the rotation circular locus of the outer periphery of the drill bit 2. The end 4e on the side of the center portion 4b of the rotation preventing wing 4 is a surface parallel to the center portion 4b of the adjacent rotation preventing wing 4, and the end 4e is fastened to the center portion 4b by a bolt 6. The electrode 9 of the ground change monitoring device 20 according to the present invention is installed on the outer peripheral end 4d of each blade 4a. The resistivity of the ground is measured with a total of four electrodes 9 (details will be described later).

[Water swivel 10]
A water swivel 10 is mounted on the upper part of the single shaft 1. The water swivel 10 is a joint for continuously supplying a ground improvement material to the rotating single shaft 1. Therefore, the water swivel 10 includes a portion that rotates integrally with the single shaft 1, a shaft that does not rotate, a bearing, a seal portion, and the like. This structure and function are known, and the description thereof is omitted. The rotating part of the water swivel 10 is integral with the single shaft 1 and rotates together. A wireless transmitter 22 that receives a measurement signal from an underground receiver 25 described later and transmits the measurement signal to the outside is mounted on a rotating unit of the water swivel 10. A hose locking member 11 is provided integrally with a fixed portion of the water swivel 10. The hose locking member 11 fixes a hose for supplying a ground improvement material.

[Example of ground improvement method]
Next, a method for improving the ground by the ground improvement device will be described. When penetrating the ground, the single shaft 1 is rotationally driven by the driving device of the ground improvement machine. Due to this rotation, the plurality of blades of the drill bit 2 and the wing body 2a bite into the ground, and the excavated soil is transferred upward. As the ground penetrates, the center portion of the rotation prevention blade 4 is supported by a bearing 7 in a rotatable state.

  Since the outer end circle locus of the turning prevention wing 4 is set larger than the excavation hole 5, the outer end 4 d (FIG. 4) of the turning prevention wing 4 bites into the inner wall surface of the excavation hole 5 during excavation. Then, the rotation prevention wing 4 is in a rotation stopped state. The rotation prevention wing 4 is in a rotation stopped state, and the specific resistance of the ground is measured by the electrode 9 of the ground change monitoring device 20 constituting the present invention both when the excavation head A advances to the excavation hole 5 and when it retreats. Thereby, the state of the ground is grasped. Since the drill bit 2 and the stirring blades 3a and 3b are continuously excavated, the counter-rotating wing 4 is in a relative rotation state, that is, only the counter-rotating wing 4 is in a rotation stopped state. It advances in the direction of excavation while biting in the direction of the rotation axis.

  At this time, the ground improvement material is simultaneously injected and discharged from the discharge holes 8. The excavated soil excavated by this injection is agitated by the stirring blades 3a, 3b and the rotation preventing wing 4 at the same time as the excavation, and becomes a mixed soil with the ground improvement material, and is relatively gradually brought upward with the agitation. . In this stirring, the excavated soil is cut by the shearing force between the rotating stirring blades 3a and 3b and the rotation preventing blade 4 stopped rotating, and is stirred while convection in the rotation direction and the vertical direction. The structure and function of the stirring head A described above are known technologies.

[Soil change monitoring device 20]
In the stirring head A described above, the ground change monitoring device 20 constituting the present invention will be described. An outline of the ground change monitoring device 20 is shown in a block diagram in FIG. The ground change monitoring device 20 includes an electrode 9, a receiving unit 21, a wireless transmitter 22, a computer 24, and the like, which are provided on an outer peripheral end 4 d of the rotation prevention wing 4. The receiving unit 21 includes a receiver 25 connected to the electrode 9 by an electric wire, and a repeater 26. The receiver 25 converts an analog signal detected by the electrode 9 into digital data, and uses the converted signal as a measurement signal as a measurement signal. To the repeater 26.

  The repeater 26 transmits the measurement signal to the wireless transmitter 22. The wireless transmitter 22 transmits the measurement signal received from the receiving unit 21 to the computer 24. The computer 24 receives and analyzes this measurement signal, and outputs the status of the ground improvement to its display for display. The wireless transmitter 22 and the repeater 26 are connected by any communication means such as wired or wireless. In the example of FIG. FIG. 3 is a diagram showing a state in which the receiving unit 21 is installed on the rotation prevention wing 4. The repeater 26 is installed in the lower end of the single shaft 1.

  Since the lower end of the single shaft 1 is located underground during normal excavation work, the repeater 26 is located underground and relays a signal transmitted from the receiver 25. The repeater 26 is connected to the electric wire 23, and transmits a measurement signal to the wireless transmitter 22 via the electric wire 23. The electric wire 23 is installed in an inter-pipe hollow portion 1b which is a hollow portion between pipes in the tubular unitary shaft 1. The receiver 25 is fixed to the rotation prevention wing 4, and the repeater 26 is fixed to the single shaft 1. A receiver 25 is provided on the blade body 4 a or the bearing 7 of the co-rotation prevention wing 4, and a repeater 26 is provided on the bearing 7.

  The electric wire 23 is wired in the hollow portion between pipes 1b which is the hollow portion between the pipes in the tubular single shaft 1. As shown in FIG. 3, a through hole 1c and a through hole 7a are provided for wiring the electric wire 23 between the single shaft 1 and the bearing 7. The through hole 1c is a hole that penetrates the pipe wall at the lower end of the single shaft 1, is connected to the hollow portion 1b between the pipes, and further penetrates to the through hole 7a of 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 repeater 26 connected to the end thereof are installed in the through-hole 7a.

  As shown in FIG. 1, grooves are arranged in the radial direction on the blade body 4 a of the rotation prevention wing 4 to arrange electric wires (not shown). Since the blade body 4a and the blade surface of the turning prevention wing 4 always contact the excavated soil and the ground improvement material, it is preferable that the electric wire and the receiver 25 are installed so as not to protrude from the blade surface as much as possible. It is also preferable to seal with a filler or the like so that excavated soil does not enter. As shown in FIG. 4, the electrode 9 is provided in front of the outer peripheral end 4 d of the blade body 4 a of the rotation prevention wing 4. The electrode 9 is connected to the receiving unit 21 by an electric wire (not shown).

  Since the blade body 4a and the blade surface of the rotation prevention blade 4 always contact the excavated soil and the ground improvement material, the electrode 9 is disposed so as to be embedded in the blade surface or the blade, and mechanical fixing means such as a screw is used. (Not shown). Further, the electrode 9 and its electric wire may be fixed to the blade surface with an adhesive. In this case, no additional parts are required and the cost is reduced. Further, the electrode 9 and its electric wire may be embedded in a blade surface or a groove provided in the blade, and fixed with a seal from above. Since the electrode 9 is fixed to the blade surface of the rotation prevention blade 4, when the rotation prevention blade 4 rotates, the electrode 9 rotates together with the rotation prevention blade 4.

  FIG. 6 is a block diagram illustrating an outline of the receiver 25. As the receiver 25, an analog communication unit, a digital communication unit, or the like can be used as long as it has a function of transmitting a measurement signal by wireless communication. The structure and function of the receiver 25 will be described with reference to, but not limited to, the receiver 25 shown in FIG. The receiver 25 includes a wireless transmitter main body 40, an antenna 47, a receiver 48, a power supply unit 46, and the like stored in a housing (not shown). The wireless transmitter main body 40 is for processing the measurement signal detected by the receiver 48 and transmitting the processed signal via the antenna 47 by wireless communication.

  The radio transmitter main body 40 includes a central processing unit (CPU) 41 for executing a predetermined command and controlling the entire apparatus, a memory 42 for storing a control program and data including the command, and a communication unit 43 for controlling communication. , A receiving unit 44 for receiving signals detected by the electrodes 9 and converting the signals into digital signals, and a bus 45 connected to each other so that these components can exchange data. The power supply unit 46 is a secondary battery for supplying power to the wireless transmitter main body 30, and an alkaline battery, a lithium ion battery, or the like can be used as the secondary battery. The power supply section 46 is preferably a small-sized and large-capacity one such as a button battery.

  The detection signal detected by the receiver 48 is signal-processed by the receiving unit 44, digitized, converted into a digital measurement signal, and sent to the communication unit 43. The communication unit 43 converts the measurement signal into a communication signal, and transmits the signal from the antenna 47 as a wireless signal. The wireless signal transmitted from the antenna 47 is received by the repeater 26. The receiver 25 has an antenna, and performs wireless communication with the repeater 26. For this reason, the casing of the receiver 25 is preferably made of a material that does not interfere with the radio waves of wireless communication. When the housing is made of a metal material having a property of blocking radio waves, a portion of the housing corresponding to the position where the antenna is installed is preferably made of a nonmetallic material.

[Repeater 26]
The repeater 26 (see FIGS. 3 and 5) may be an analog communication unit, a digital communication unit, or the like, if it has a function of receiving the measurement signal transmitted from the receiver 25 and transferring it to the wireless transmitter 22. Can be used. For example, the repeater 26 includes a main body stored in a housing (not shown) and an antenna. Although not shown, the main body includes a central processing unit (CPU) for executing predetermined instructions and controlling the entire apparatus, a memory for storing control programs and data including the instructions, a communication unit for controlling communication, and a measurement signal. And a receiving unit for receiving the information. A connection terminal (not shown) of the repeater 26 is connected to the wireless transmitter 22 via the electric wire 23, thereby transmitting a measurement signal. Note that the present invention is not an invention having the repeater 26 as a gist, and thus a detailed description thereof will be omitted.

[Wireless transmitter 22]
The wireless transmitter 22 is mounted in the water swivel 10, particularly on a rotating part thereof. The wireless transmitter 22 can be used in either analog communication means or digital communication means as long as it has a function of receiving the measurement signal transmitted from the receiving section 21 and transmitting the signal by wireless communication. For example, the wireless transmitter 22 and the computer 24 communicate with each other by using a communication method conforming to an arbitrary wireless communication standard such as Wi-Fi or Buletooth (registered trademark). The wireless transmitter 22 includes, for example, a wireless transmitter main body and an antenna stored in a housing (not shown). The wireless transmitter main body is a device for processing a measurement signal and transmitting the signal by wireless communication.

  The main body of the wireless transmitter includes a central processing unit (CPU) for executing a predetermined command and controlling the entire apparatus, a memory for storing a control program and data including the command, a communication unit for controlling communication, and a measurement signal. It comprises a receiving section for receiving and converting into a digital signal. The connection terminal of the wireless transmitter 22 is connected to the repeater 26 via the electric wire 23, so that the measurement signal of the receiver 25 is received. Note that the present invention is not an invention of the wireless transmitter 22, and a detailed description thereof will be omitted.

[Computer 24]
The computer 24 includes a central processing unit (CPU) for executing a predetermined instruction and controlling the entire apparatus, a memory for storing a control program and data including the instruction, a communication unit for communicating with the wireless transmitter 22, and an input / output unit. It is a general-purpose computer equipped with. As the computer 24, for example, a general-purpose computer such as a personal computer, a tablet terminal, and a smartphone is used. The computer 24 communicates with the wireless transmitter 22 by employing a communication method conforming to an arbitrary wireless communication standard such as Wi-Fi, Buletooth, or the like. Since these wireless communication standards are publicly known descriptions, detailed description will be omitted.

  When the stirring head A is lowered, the specific resistance of the ground is measured using the electrode 9 installed on the outer peripheral end 4d of the rotation prevention blade 4 (step 3). The measured measurement signal is transmitted to the computer 24 via the receiver 25, the repeater 26, and the wireless transmitter 22, as shown in FIG. 5 (Step 4). The computer 24 accumulates the received measurement signals and stores them in the auxiliary storage device in association with the working depth of the stirring head A, the elapsed time, and the like (step 5). As described above, when the ground is excavated with the drill bit 2 of the stirring head A and reaches a predetermined depth while being mixed and stirred with the improved material, the descent is stopped (step 6). Then, the drill bit 2 of the stirring head A starts to rise while rotating and performing ground improvement (step 6). When the stirring head A is raised, the specific resistance of the ground is measured using the electrode 9 installed on the outer peripheral end 4d of the rotation prevention blade 4 (step 7).

  The measured measurement signal is transmitted to the computer 24 via the receiver 25, the repeater 26, and the wireless transmitter 22 as shown in FIG. 5 (Step 8). The computer 24 accumulates the received measurement signals and stores them in the auxiliary storage device in association with the working depth of the stirring head A, the elapsed time, and the like (step 9). Thus, the computer 24 obtains a measurement signal when the stirring head A descends and rises. By comparing the measurement signal when descending and the measurement signal when ascending, the state of the ground and the state of ground improvement are grasped (step 10).

[About measurement]
FIG. 8 illustrates the arrangement of the electrodes 9. In the present embodiment of the present invention, four electrodes 9 are used, and FIG. 8 is provided with reference numerals of electrodes 9a, 9b, 9c, 9d, respectively. An electric current is applied to two electrodes 9 arranged around the single shaft 1, and a voltage is measured by the remaining two electrodes 9. In the example of FIG. 8, a current flows through the electrodes 9a and 9b, and a voltage is measured by the electrodes 9c and 9d. A current can be applied to the electrodes 9c and 9d, and the voltage can be measured by the electrodes 9a and 9b. Generally speaking, a current is applied to two electrodes 9 arranged adjacent to each other, and a voltage is measured by the remaining two electrodes. As conceptually illustrated in FIG. 8, the voltage is measured with a voltmeter, and the current is measured with an ammeter. In one example, a constant current can be applied to the electrodes 9a and 9b, and the voltage can be measured by the electrodes 9c and 9d. In this case, only the voltage needs to be measured, and the number of measurement signals can be reduced.

  In one example, when changing the current of the electrodes 9a and 9b, the current is measured by an ammeter and the voltage is measured by a voltmeter. The measured signal is finally transmitted from the receiver 25 to the computer 24. The computer 24 processes the received measurement signal to obtain a change in specific resistance from the current and the voltage. The resistance of the ground is inversely proportional to the electrode spacing, which is the distance between the electrodes installed on the ground. In the case of the ground, a method of obtaining a specific resistance (resistivity) ρ, more specifically, a method of obtaining a theoretical formula based on a buried electrode and a method of obtaining an apparent resistance by arranging an underground square will be described with reference to FIG.

ここで、ＶＰは点Ｐでの理論電位、ρは比抵抗、Ｉは点Ｃでの電流、ｒ₁は点Ｃと点Ｐ間の距離、ｒ₂は仮想電極Ｃ＊と点Ｐ間の距離である。FIG. 9 conceptually illustrates a buried point electrode. Here, z indicates the burial depth of the point electrode. If there is a point current electrode where + I current flows at the point C in the ground, the theoretical potential VP at the point P is obtained by considering the virtual electrode (mirror image) C * in the air as follows: Can be

Here, VP is the theoretical potential at the point P, ρ is the specific resistance, I is the current at the point C, r ₁ is the distance between the points C and P, r ₂ is the distance between the virtual electrode C * and the point P It is.

  FIG. 10 is a diagram illustrating an example in which two current electrodes and two potential electrodes are arranged in a square shape. FIG. 10A is a plan view, and FIG. 10B is a cross-sectional view. . In FIG. 10B, the point C is shown on the near side, and the point A is located on the far side of the paper surface and overlaps the point C, so that it cannot be seen in the figure. In FIG. 10, points A and B are positions where current electrodes are arranged, and points C and D are positions where potential electrodes are arranged.

ここで、Ｖは点Ｄと点Ｃ間の理論電位、ρは比抵抗、Ｉは点Ａと点Ｂを流れる電流、ａは供回り防止翼４の中心点Ｏから点Ａ，点Ｂ，点Ｃ及び点Ｄまでの距離、ｚは電極の埋設深度である。Point A, point B, point C and point D shown in FIG. 10 conceptually represent the electrode 9 installed on the outer peripheral end 4d of the blade body 4a of the co-rotation prevention wing 4, as shown in FIG. FIG. Let z be the embedding depth of points A, B, C and D. As shown in FIG. 10, the theoretical potential detected by the potential electrode in the ground is as follows.

Here, V is the theoretical potential between the points D and C, ρ is the specific resistance, I is the current flowing through the points A and B, and a is the point A, the point B, the point The distance to C and point D, z is the burial depth of the electrode.

The apparent specific resistance ρ _a obtained from Expression 2 is as follows.

  The calculation uses Equations 1 to 3 to determine the change in apparent resistivity ρa. In particular, at each location of the ground, the specific resistance when the stirring head A descends and the apparent specific resistance when the stirring head A rises are compared to calculate how much the ground has changed. Thereby, it can be grasped whether or not the ground has been properly improved.

[Others]
When the single shaft 1 is long, the single shaft 1 includes an upper single shaft and a lower single shaft, and the upper single shaft and the lower single shaft may be connected in a male and female form. In this connection portion, a through hole is provided, and the electric wire 23 can be passed through. Further, a concave portion or the like may be provided at the lower end of the upper single shaft and the upper end of the lower single shaft, respectively, and the electric wires 23 may be connected by non-contact terminals. Since the non-contact terminal is a known technique, a detailed description is omitted.

  As the repeater 26 and the wireless transmitter 22, it is possible to use a ZigBee Coordinator (hereinafter, referred to as ZC) and a ZigBee End Device (hereinafter, referred to as ZED), which are communication devices conforming to the short-range wireless communication standard ZigBee. it can. The ZC as the repeater 26 is connected to the wireless transmitter 22 via the electric wire 23. The receiver 25 is connected to the ZED. The ZED receives the measurement signal detected by the receiver 25 and transmits the signal to the ZC by wireless communication. The ZC transmits the measurement signal received from the ZED to the wireless transmitter 22.

  Wireless communication between ZC and ZED is performed by antennas connected to each. ZigBee is standardized as IEEE 802.15.4 in the specification of the lowest physical layer and data link layer among the seven layers of the communication protocol based on the OSI reference model (OSI reference model) formulated by the International Organization for Standardization (ISO). ing. ZigBee is characterized by a short transfer distance of communication data, a low transfer speed, and low power consumption. A device conforming to ZigBee is inexpensive and has low power consumption, and thus has an advantage that it can be used for a long time, and is mainly used for a sensor network.

  ZigBee-compliant devices operate in the operating frequency bands of 2.4 GHz, 902-928 MHz, and 868-870 MHz. ZC and ZED 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. , A built-in antenna for wireless communication with an external device, an external antenna connector for connecting an antenna for wireless communication with an external device, and the like.

  The microcomputer includes a central processing unit (CPU), a RAM, a flash memory, and the like. As described above, the data communication based on the pair of ZC and ZED according to the ZigBee standard has been described. However, a ZigBee Router (ZR) which is a device for relaying data between ZC and ZED can be used. The ZR has basically the same structure as the ZC, and is set as a router. Since ZC, ZED, ZR, and the communication between them are known technologies, detailed description will be omitted.

The relay 26 and the wireless transmitter 22 can perform communication based on the Bluetooth standard of the short-range wireless communication standard. The Bluetooth standard is a standard that enables communication over a distance of about several tens of meters and is known as IEEE 802.15.1. Bluetooth standard is a standard which performs wireless communication at a relatively low rate between information devices using a 2.4 GHz _Z bands. Each of the repeater 26 and the wireless transmitter 22 has a built-in communication module based on the Bluetooth standard, and communicates with each other. The Bluetooth standard used for communication between the repeater 26 and the wireless transmitter 22 can employ any version from version 1 to version 5, but version 3 or 4 in which the communication device operates with low power consumption is particularly preferable. Since the Bluetooth standard is widely spread and used worldwide, detailed description is omitted.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. The ground change monitoring device constituting the present invention in the second embodiment is basically the same as the ground change monitoring device in the first embodiment, and only different portions will be described here. FIG. 11 is a diagram illustrating a state in which the electrode 9 is installed inside the counter-rotating wing 4 in the ground change monitoring device according to the second embodiment.

  The anti-rotational wing 4 has the same structure as that of FIG. 4, and a detailed description of the structure is omitted. An electrode 9 is provided at the center of each blade body 4a of the co-rotation prevention wing 4. With a total of four electrodes 9, the specific resistance of the ground is measured. When the electrode 9 is installed in this way, the specific resistance inside the ground improvement pile where the ground improvement is being performed is measured. In this case, the measurement of the specific resistance is performed as follows. When the stirring head A is lowered, the specific resistance of the ground is measured using the electrode 9 installed at the center of the blade body 4a of the rotation prevention blade 4.

  The measured measurement signal is transmitted to the computer 24 via the receiver 25, the repeater 26, and the wireless transmitter 22. When the ground reaches a predetermined depth while excavating the ground with the drill bit 2 of the stirring head A, the descent is stopped. And it starts to rise while rotating and improving the ground. When the stirring head A is raised, the specific resistance of the ground is measured using the electrode 9. The measured measurement signal is transmitted to the computer 24 via the receiver 25, the repeater 26, and the wireless transmitter 22, as in the first embodiment. The computer 24 accumulates measurement signals when the agitating head A descends and ascends, and stores them in the auxiliary storage device in association with the working depth of the agitating head A, elapsed time, and the like. By analyzing these measurement signals, the state of the ground improvement is grasped.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to the drawings. The ground change monitoring device constituting the present invention in the third embodiment is basically the same as the ground change monitoring device in the first or second embodiment except for the communication means, and differs therefrom. Only the part will be described.

  FIG. 12 illustrates an outline of a ground change monitoring device according to the third embodiment of this invention. The ground change monitoring apparatus according to the third embodiment of the present invention includes a resistivity measurement unit 50 installed near the non-turning wing 4 and a communication unit 51 installed above the single shaft 1. The specific resistance measuring unit 50 is installed at the tip of a single shaft in the excavation hole 5 as shown in FIG. 13, and the electrodes 9 for detecting the specific resistance of the ground, and the signals detected by the electrodes 9 are signaled. It comprises a specific resistance signal processing section 52 for processing and a second coil 53 for transmitting and receiving signals to and from the communication section 51 by magnetic resonance coupling. The electrode 9 is provided on the rotation prevention wing 4 as described in the first embodiment of the present invention. The electrode 9 is a sensor for detecting the specific resistance of the ground during ground improvement. Since the electrode 9 has been described in detail above, a detailed description thereof will be omitted.

  The specific resistance signal processing unit 52 performs signal processing on the signal detected by the electrode 9 to generate a transmission signal to be transmitted, and transmits the transmission signal to the communication unit 51 via the second coil 53. Further, the specific resistance signal processing unit 52 analyzes the signal received by the second coil 53 and controls the specific resistance measurement unit 50. The communication unit 51 includes a first coil 54 for receiving a signal from the resistivity measurement unit 50, a transceiver 55 for processing the received signal, and a wireless transceiver 56 for transmitting a signal from the transceiver 55 to the outside by wireless communication. Consists of The communication unit 51 is installed on the water swivel 10 or the like above the single shaft 1 as shown in FIG. 14 showing the transceiver 55 and the first coil 54.

(Magnetic resonance coupling)
In magnetic field resonance coupling, when two remotely located resonance circuits operate at the same frequency, a phenomenon of magnetic field resonance occurs, and power can be transmitted from one resonance circuit to another resonance circuit. Specifically, the two resonance circuits are a primary side resonance circuit and a secondary side resonance circuit. By setting both resonance frequencies to the same frequency, magnetic field resonance occurs and high-efficiency power can be transmitted. The present invention utilizes such a principle of the magnetic field resonance coupling to use the primary side resonance circuit having the first coil 54 and the secondary side resonance circuit on the side of the second coil 53, but since the resonance frequency is the same. Conversely, a secondary-side resonance circuit having the first coil 54 and a secondary-side resonance circuit on the second coil 53 side can be used.

  In this example, communication is performed using the primary resonance circuit on the first coil 54 side and the secondary resonance circuit having the second coil 53. In the example illustrated in FIG. 13, the second coil 53 is disposed so as to wind around the single shaft 1 at the center of the co-rotation prevention wing 4. The detection signal from the electrode 9 is processed by the specific resistance signal processing unit 52. The signal output from the specific resistance signal processing unit 52 is transmitted from the second coil 53 to the first coil 54 of the communication unit 51.

  Therefore, the present invention is not limited to this, but it is preferable that the second coil 53 be installed at a location close to the specific resistance signal processing unit 52. The communication unit 51 including the first coil 54 is disposed above the water swivel 10, the clamp, and the single shaft 1. The first coil 54 is installed so as to wind the single shaft 1 from outside. The installation location may be any location as long as it does not interfere with the operation function of the machine. As shown in FIG. 14, the first coil 54 is installed below the water swivel 10, and the transceiver 55 is installed on the water swivel 10. The first coil 54 and the second coil 53 are composed of electric wires having an insulating coating. The first coil 54 and the second coil 53 are arranged at such positions as to be wound from the outer circumference with the single shaft 1 concentric. However, if the sensitivity is sacrificed, the first coil 54 and the second coil 53 need not always be arranged concentrically.

  FIG. 15 illustrates the arrangement of the electrodes 9. In the present embodiment of the present invention, eight electrodes 9 are used, and as shown in FIG. 15, each of the electrodes 9e, 9f, 9g, 9h, 9i, 9j, 9k, 9l and 9l is denoted by a reference number. Has been granted. The electrodes 9e, 9f, 9i, and 9j are installed in front of the outer peripheral end 4d of the blade body 4a of the co-rotation prevention wing 4. The electrodes 9g, 9h, 9k and 9l are installed in front of the end 4e on the side of the center 4b of the anti-corotating wing 4. The electrode 9e and the electrode 9f are provided so as to face each other.

  Similarly, electrodes 9i and 9j, electrodes 9g and 9h, and electrodes 9k and 9l are arranged. The electrodes 9g, 9h, 9k, and 91 installed near the center portion 4b of the anti-rotation wing 4 measure the specific resistance in the excavation hole 5 and around the single axis 1. In other words, the electrodes 9g, 9h, 9k and 9l measure the mixed state of the ground improvement material and the excavated soil in the excavation hole 5. In this example, the voltage is measured by the two electrodes 9k and 9l, and the current is measured by applying a current to the two electrodes 9g and 9h.

  Since the electrodes 9e, 9f, 9i and 9j installed on the outer peripheral end 4d of the blade body 4a of the swirl prevention wing 4 are located outside the excavation hole 5, the specific resistance of the ground outside the excavation hole 5 is measured. I do. In this example, a voltage is measured by the two electrodes 9i and 9j, and a current is measured by flowing a current through the two electrodes 9e and 9f. Thus, the specific resistance in the wellbore 5 is measured by both voltage and current. Similarly, the specific resistance outside the borehole 5 is measured by both voltage and current. When each electrode 9 is installed on the blade body 4a of the rotation prevention wing 4, the electrode 9 is isolated from the blade body 4a by an insulating material, and the measurement surface directly contacts the ground, excavated soil, ground improvement material, and the like.

  FIG. 16 is a graph showing an example of data when the specific resistance of the ground is measured by the ground change monitoring device. The horizontal axis of the graph illustrated in FIG. 16 indicates the specific resistance value [Ω · m], and the vertical axis indicates the excavation depth. The specific resistance of the ground changes depending on the proportion and type of clay, sand, stone, and the like constituting the ground. In this method, data is obtained while excavating in advance, and the same data is taken for comparison during ground improvement. This example is illustrated in FIG. At the time of excavation without soil improvement, the resistance increases as the excavation depth increases.

  In the first example of excavation for ground improvement, the resistance is constant as the excavation depth increases. This indicates that the ground improvement material, eg, cement, and the excavated soil were uniformly mixed in the excavation pile during the ground improvement. In a second example of excavation during ground improvement, the excavation depth suddenly decreases at first, and is nearly constant, but increases at the end. This indicates that the specific resistance is greatly deviated from the surroundings, and thus, there is a possibility that the stirring is not performed.

  In other words, during ground improvement, when the ground improvement material is injected in the excavated soil, it indicates the possibility that the rotation preventing wings are rotating together. As described above, by using the monitoring system of the present invention to measure the specific resistance during ground improvement, it is possible to confirm whether the ground improvement material and the excavated soil are correctly mixed. In addition, when the stratum constituting the ground is different, it is possible to confirm whether the stratum has landed on the support layer. This is because the specific resistance changes when the support layer is landed. As understood from the above description, the suitability of the improved soil and the geology of the ground are determined by comparing the absolute value or the rate of change of the measured resistivity value with the known resistivity value in advance. it can.

[Circuit example of magnetic resonance coupling communication]
FIG. 17 is a diagram illustrating an outline of a circuit example of magnetic resonance coupling communication of the ground change monitoring device according to the third embodiment of the present invention. This magnetic resonance coupling communication includes a transmission circuit unit 70 and a reception circuit unit 71. In FIG. 17, the single shaft 1 is indicated by a broken line, and the second coil 53 and the first coil 54 are installed at a distance L around the single shaft 1. The transmission circuit unit 70 includes a second coil 53, a capacitor 72, and a transmission circuit 72. The second coil 53 is shown in FIG. The second coil 53 and the capacitor 72 are adjusted so as to resonate at a predetermined frequency, forming a resonance circuit.

  The second coil 53 and the capacitor 72 are connected in parallel, and the output terminal thereof is connected to the transmission circuit 72. The transmission circuit 72 is a load of the resonance circuit, is included in the specific resistance signal processing unit 52 illustrated in FIG. 12, and is a communication unit. The transmission signal output from the specific resistance signal processing unit 52 is transmitted via a resonance circuit including the second coil 53 and the capacitor 72. The receiving circuit unit 71 is for receiving the transmission signal output from the transmitting circuit unit 70, and includes a first coil 54, a capacitor 74, and a receiving circuit 75. The first coil 54 is shown in FIG.

  The first coil 54 and the capacitor 74 are adjusted so as to resonate at a predetermined frequency, forming a resonance circuit. The first coil 54 and the capacitor 74 are connected in parallel, and the output terminal thereof is connected to the receiving circuit 75. The receiving circuit 75 is a load of the resonance circuit, is included in the transceiver 55 shown in FIG. 12, and is a receiving unit for magnetic resonance coupling communication. The receiving circuit 75 receives the above-described transmission signal via a resonance circuit including the second coil 53 and the capacitor 72, processes the received signal, and transmits the processed signal to the wireless transceiver 56.

  The resonance circuit consisting of the second coil 53 and the capacitor 72 and the resonance circuit consisting of the first coil 54 and the capacitor 74 operate at the same frequency and communicate with each other by magnetic resonance coupling. In other words, in the magnetic field resonance coupling, two resonance circuits couple by a magnetic field in the resonance state of the coil and the capacitor to perform power transmission. As described above, the wireless power transmission is a non-radiation type, but a coupling type power transmission. The magnetic resonance coupling used in the present invention operates at a frequency between 10 kHz and 100 MHz.

  FIG. 18 is a block diagram illustrating an outline of a circuit example of the magnetic field resonance coupling communication of the ground change monitoring device according to the third embodiment of the present invention. FIG. FIG. 18B is a block diagram illustrating a configuration example of the receiving circuit 75. The transmitting circuit 73 includes a modulating unit 80 for modulating a digital signal so that it can communicate, an amplifying unit 81 for amplifying the digital signal, and the like, and is connected to a resonance circuit including the second coil 53.

  As shown in FIG. 18A, a digital signal which is a signal detected by the electrode 9 is modulated by the modulation unit 80, and the modulated signal is amplified by the amplification unit 81 until a predetermined intensity is obtained. Data is transmitted by magnetic resonance coupling communication via the second coil 53 of the resonance circuit. The receiving circuit 75 includes a tuning unit 82 for receiving a signal in synchronization with the first coil 54, an amplifying unit 83 for amplifying the signal, a demodulating unit 84 for demodulating and outputting a digital signal from the received and amplified signal, and the like. Consists of The modulation unit 80 can employ a modulation method such as intensity modulation or load modulation of the digital signal.

  As shown in FIG. 18B, the first coil 54 is magnetically resonantly coupled with the second coil 53. Then, the tuning unit 82 tunes with the first coil 54 to receive a signal. This signal is a signal modulated by the modulation unit 80 described above. The amplification unit 83 amplifies the signal output from the tuning unit 82 until the signal has a predetermined strength. The demodulation unit 84 demodulates the amplified signal and outputs a digital signal. This digital signal is the same signal as the digital signal before being modulated by the modulator 80 described above. The digital signal output from demodulation section 84 is transmitted to radio transceiver 56 (see FIG. 12).

[Specific resistance signal processing unit 52]
FIG. 19 is a block diagram showing an outline of a specific configuration example of the specific resistance signal processing unit 52. The specific resistance signal processing section 52 includes a potential measurement amplification circuit section 60, a control operation circuit section 61, a current generation circuit section 62, a current detection circuit section 63, a battery 64, a drive circuit section 65, a detection circuit section 66, and an amplification circuit section 67. Etc. The potential measurement amplification circuit section 60 is a circuit for measuring the potential of the electrode 9 and amplifying the measured electric signal.

  The control operation circuit unit 61 is a circuit for receiving, controlling, and calculating output signals of the potential measurement amplification circuit unit 60 and the control operation circuit unit 61. The current generation circuit section 62 is a circuit for generating a current flowing to the electrode 9. The current detection circuit section 63 is a circuit for detecting a current of the electrode 9. The battery 64 is a battery for supplying necessary power to the specific resistance signal processing unit 52, and includes an arbitrary power storage means such as a primary battery and a secondary battery. The drive circuit section 65 controls the second coil 53, the control operation circuit section 61, and the like. In particular, the drive circuit section 65 is a circuit that controls the second coil 53 and adjusts the resonance frequency.

  The detection circuit section 66 is a circuit that detects a signal relating to specific resistance from the operation signal output from the control operation circuit section 61. The control operation circuit 61 converts a specific resistance signal from a signal such as a high-frequency signal into a DC signal and outputs the DC signal. This specific resistance signal is amplified by the amplifier circuit section 67 and transmitted to the second coil 53. Communication between the first coil 54 and the second coil 53 is performed by magnetic resonance coupling via the single shaft 1. Although not shown in FIG. 19, the first coil 54 is connected to a capacitor to form a resonance circuit (see FIG. 17).

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to the drawings. In the fourth embodiment, the ground change monitoring device constituting the present invention is basically the same as the ground change monitoring device in the third embodiment, and only different portions will be described here. FIG. 20 is a block diagram illustrating an outline of another example of a circuit for magnetic resonance coupling communication of the ground change monitoring apparatus according to the fourth embodiment of this invention.

  The circuit 90 illustrated in FIG. 20 is one in which the transmission circuit and the reception circuit of the magnetic resonance coupling communication are realized by one circuit. The circuit 90 includes a coil 91, a switch 92, an amplifier 93, a modulator 94, a tuning unit 95, an amplifier 96, and a demodulator 97. The coil 91 has a function as both a transmission coil and a reception coil for the magnetic resonance coupling communication. By switching the switch 92, the circuit 90 can be switched between a transmission circuit having a transmission function and a reception circuit having a reception function. In the example of FIG. 20, the circuit 90 becomes a transmission circuit when the switch 92 is connected to the first node side, as indicated by a solid line. As shown by the broken line, when the switch 92 is connected to the second node, the circuit 90 becomes a receiving circuit. Here, a case where the circuit 90 is a transmission circuit will be described. First, the switch 92 is connected to the first node side, and the circuit 90 operates as a transmission circuit. The digital signal is modulated by the modulator 94, amplified by the amplifier 93, and transmitted by magnetic resonance coupling communication via a resonance circuit including the coil 91.

  Next, a case where the circuit 90 is a receiving circuit will be described. The switch 92 is connected to the second node, and the circuit 90 operates as a receiving circuit. The coil 91 is magnetically resonantly coupled with the coil of the communication partner, and the tuning unit 95 tunes with the coil 91 to receive a signal. The signal output from the tuning unit 95 is amplified by the amplifying unit 96, and is amplified until the signal has a predetermined strength. Demodulation section 97 demodulates the amplified signal and outputs a digital signal. In this manner, by simply switching the switch 92 of the circuit 90, the circuit 90 can be used as both a transmission circuit and a reception circuit. As the switch 92, an arbitrary type of switch such as a two-contact (bidirectional contact switch, a double throw switch) push button switch, a toggle switch, and the like, which can be turned on and off, can be used.

[Other embodiments]
In the above-described embodiment, the specific resistance value measures the physical properties of the ground and the improved soil. However, if necessary, the specific resistance value of the excavated soil may be measured. Although the measurement of the physical properties is performed when the excavated soil and the ground improvement material are mixed and ascended, the physical properties of the ground may be measured during the first excavation of the ground. In addition, when the agitation is performed a plurality of times, the physical properties of the improved soil may be measured for each agitation to verify the agitation effect.

  The present invention is preferably used in the fields of civil engineering and construction. In particular, the present invention can be used in the field of ground improvement of foundations of structures such as bridges and foundations of buildings that require soil improvement to maintain stability in soft ground.

A: stirring head 1: single shaft 2: drill bit 3a, 3b: stirring blade 4: rotation prevention blade 4a: blade body 4d: outer peripheral end (of the outer periphery of rotation prevention blade 4) 5: excavation hole 7: Bearing 8 ... Discharge hole 9 ... Electrode 10 ... Water swivel 11 ... Hose locking member 20 ... Soil change monitoring device 21 ... Receiving unit 22 ... Wireless transmitter 23 ... Electric wire 24 ... Computer 25 ... Receiver 26 ... Repeater 50 ... Ratio Resistance measuring unit 51 Communication unit 52 Resistive signal processing unit 53 Second coil 54 First coil 55 Transceiver 56 Wireless transceiver 60 Potential measurement amplification unit 61 Control operation circuit unit 62 Current generation circuit Unit 63: Current detection circuit unit 64: Battery 65: Drive circuit unit 66: Detection circuit unit 67: Amplifier circuit unit 70: Transmission circuit unit 71: Receiving circuit unit 72: Capacitor 73: Transmission circuit 75: Receiving circuit 80 ... Modulation unit 81 ... Amplification unit 82 ... Tuning unit 83 ... Amplification unit 84 ... Demodulation unit 90 ... Circuit 91 ... Coil 92 ... Switch 93 ... Amplification unit 94 ... Modulation unit 95 ... Tuning unit 96 ... Amplification unit 97 ... Demodulation unit

Claims (15)

A ground improvement apparatus for digging a ground and digging a digging hole, mixing the digged excavated soil and a ground improvement material, and improving the ground in the digging hole,
A single shaft having a discharge hole for discharging the ground improvement material, which is rotationally driven by a rotary driving device,
A wing body fixed to the single shaft, for stirring the excavated soil and the ground improvement material in the excavation hole,
A drill bit that is provided at an end on the ground bottom side of the single shaft and has a plurality of drill blades and drills the drill hole.
The excavated soil that is rotatably provided on the single shaft, an outer peripheral end of which is engaged with a peripheral wall of the excavation hole, is stopped from rotating, and is excavated by rotating relative to the rotation of the wing body and the drilling bit. And a counter-rotating wing that mixes and stirs with the ground improvement material.
In order to measure physical properties of the ground or the improved soil obtained by mixing the excavated soil and the ground improvement material, an electrode installed on the circling prevention wing and a measuring unit connected to the electrode, wherein A specific resistance measuring means for measuring a first specific resistance which is a specific resistance and / or a second specific resistance which is a specific resistance of the improved soil and outputting a measurement signal;
It is connected to the specific resistance measuring means, and comprises communication means for transmitting the measurement signal to the ground or to the upper part of the single axis,
The ground improvement wing, wherein the electrode is installed on a portion of the counter-rotating wing located on the outer circumference of the digging hole to measure the specific resistance of the ground on the outer circumference of the digging hole. Resistivity detection device using A resistivity detector using the ground improvement wing according to claim 1,
The specific resistance detection device,
Receiving the measurement signal from the communication means and calculating the first specific resistance and / or the second specific resistance and / or the change rate of the first specific resistance and / or the second specific resistance from the ground or Determining means for determining the physical properties of the improved soil and outputting a determination result signal;
Display means for displaying the determination result signal on a display device. A specific resistance detection device using ground improvement wings. A resistivity detector using the ground improvement wing according to claim 2,
Wherein the determination means determines the absolute value of the first specific resistance and / or the second specific resistance or a change rate of the first specific resistance and / or the second specific resistance. A specific resistance detection device using wings. A resistivity detector using the ground improvement wing according to claim 2 or 3,
The resistivity measuring means has data processing means for converting analog data of the measurement signal detected by the electrode into digital data and transmitting the digital data to the communication means. apparatus. A specific resistance detecting device using the ground improvement wing according to claim 1 selected from claim 1,
The electrode is provided at a portion of the counter-rotating wing located in the excavation hole to measure the specific resistance of the improved soil. . A resistivity detector using the ground improvement wing according to claim 4,
The specific resistance detection device,
A ground disposed above the single axis, comprising a wireless communication unit for receiving the measurement signal from the communication unit, converting the measurement signal into a wireless signal, and transmitting the wireless signal to the determination unit. Resistivity detector using improved wings. A resistivity detector using the ground improvement wing according to claim 6,
The communication means includes: (a) a receiving means installed in a lower end of the single shaft for receiving the measurement signal from the resistivity measuring means; and (b) a hollow portion between pipes in the single shaft. And a wire for transmitting the measurement signal from the receiving means to the wireless communication means through the receiving means and the wireless communication means. apparatus. A resistivity detector using the ground improvement wing according to claim 6,
The communication means is provided in the lower end of the single shaft, is connected to the resistivity measurement means, receives the measurement signal from the resistivity measurement means, and transmits the measurement signal to the radio communication means by wireless communication. A specific resistance detecting device using a ground improvement wing, which is a wireless relay means. A resistivity detector using the ground improvement wing according to claim 8,
The communication means is a ground improvement wing characterized by being a ZigBee Coordinator and a ZigBee End Device compliant with the ZigBee (registered trademark) standard of the short-range wireless communication standard , or a ZigBee Coordinator, a ZigBee Router and a ZigBee End Device. Specific resistance detector. A resistivity detector using the ground improvement wing according to claim 8,
A specific resistance detecting device using a ground improvement wing, wherein the communication means conforms to a Bluetooth (registered trademark) standard of a short-range wireless communication standard . A resistivity detector using the ground improvement wing according to claim 6,
The wireless communication means is arranged on a water swivel fixed to the upper end of the single shaft to continuously send the ground improvement material into the rotating single shaft. The specific resistance detector used. A resistivity detector using the ground improvement wing according to claim 7,
The electric wire is connected by an electromagnetic connection terminal at a connection portion of the single shaft. A specific resistance detection device using a ground improvement wing. A resistivity detector using the ground improvement wing according to claim 6,
The communication means is for communicating with the wireless communication means by magnetic resonance coupling, and comprises a second coil;
The specific resistance detecting device using a ground improvement wing, wherein the wireless communication means is for communicating with the communication means by magnetic resonance coupling and includes a wireless signal receiving means including a first coil. A resistivity detector using the ground improvement wing according to claim 13,
The first coil is wound around a water swivel fixed to the upper end of the single shaft to continuously feed the ground improvement material into the single shaft, or a hose locking member that supplies the ground improvement material. Has been installed,
The said 2nd coil is wound and arrange | positioned so that it may be located in the outer periphery of the said single axis | shaft with the said rotation prevention wing, The specific resistance detection apparatus using the ground improvement wing characterized by the above-mentioned. A specific resistance detecting device using the ground improvement wing according to claim 1 selected from among claims 1 to 14,
The specific resistance detecting device using a ground improvement wing, wherein the rotation prevention wing is a cross shape.

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