JP6272404B2 - Ground cutting condition monitoring device - Google Patents

Description

  The present invention is a soft ground improvement method, the ground cutting state when creating a ground improvement body by stirring and mixing the solidifying agent and the raw soil injected with high pressure from the injection nozzle of the injection pipe inserted into the ground Is to be used by being inserted into a measurement pipe buried in the ground at a predetermined interval from the injection pipe.

In general, the high-pressure jet agitation method is a method in which a solidified material is injected at a high pressure from an injection nozzle at its tip through an injection pipe inserted into the ground, and the ground is cut and collapsed by its powerful energy, and the solidified material and the soil This is a method for forcibly stirring and mixing to create a cylindrical improvement body, and is known as a ground improvement method that can be used for multiple purposes from temporary installation to main construction.
However, since the stirring and mixing of the raw earth and the solidified material is performed in the ground and cannot be visually observed, it is necessary to confirm the construction status by some method. Conventionally, this type of confirmation has been performed by methods such as check boring performed after construction or a part of the head of the ground improvement body that has been created.
Further, for example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 07-18660), the resistivity of the ground improvement column and soil around it is measured by an electrode group in a sonde suspended from the tip of the injection tube, and the measurement is performed. A confirmation method for estimating the completion status of the ground improvement body being formed based on the value is described.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2007-182695) discloses a high pressure in which a slurry containing a cement-based solidified material mainly composed of oxidized calcium is jetted and stirred into the ground to form a cylindrical ground improvement body. In the jet agitation method, a method is described in which the diameter of the ground improvement body is estimated from the content of calcium oxide by utilizing the relationship that the diameter of the ground improvement body formed is smaller as the content ratio of calcium oxide is larger. .
In Patent Document 3 (Japanese Patent Laid-Open No. 2012-62626), a plurality of built-in pipes inserted around the injection pipe, and a high-pressure jet from the injection nozzle at the tip of the injection pipe are installed in the built-in pipe, respectively. Sound collectors that monitor the sound that strikes the built-in pipe of the solidified material, a hoisting device that steps up the sound collector in conjunction with stepping up the injection nozzle, and sound data monitored by the sound collector A monitoring device is described that includes a management device that centrally manages the sound and a recording device that records monitored sound data.

Japanese Patent Application Laid-Open No. 07-18660 JP 2007-182695 A JP 2012-62626 A

However, check boring and the method of confirming the diameter of the ground improvement body by partially exposing the head of the ground improvement body are methods that are performed after the ground improvement body is created. However, it was not possible to respond immediately, and it was necessary to install a new device for construction.
Moreover, the detection apparatus of patent document 1 measures the specific resistance of the surrounding ground improvement pillar and soil with the electrode group in the sonde hung at the front-end | tip of an injection tube, and estimates the situation from the result of a geological improvement body Therefore, the diameter of the ground improvement body cannot be measured instantaneously and accurately.
In Patent Document 2, since the calcium oxide content of the ground improvement body is measured, it cannot be said to be real-time processing, and it is difficult to accurately predict the diameter of the ground improvement body. I have to say.

Further, in Patent Document 3, the sound hitting the built-in pipe of the solidifying material jetted at high speed spreads in the vertical direction or resonates in the built-up pipe, so that the position hitting the built-in pipe of the solidifying material is accurately determined. There is a problem that it cannot be detected.
Further, in Patent Document 3, the sound collecting microphone can be fixed at an arbitrary position, but in order to move, a packer with an air hose dropped from the ground in a packer equipped with a sound collector is used. It is inconvenient that it is forced to carry out the troublesome work of drawing out the air inside and storing it, and then injecting it into the packer and fixing it by inflating it. Since a blower tube must be provided, the manufacturing cost and work cost increase.

The present invention has been made in view of the above-described circumstances, and a first object is to provide a solidified material, which is injected at high pressure from an injection nozzle of an injection pipe inserted into the ground, around the injection pipe. It is to provide a monitoring device that can accurately detect during construction that it hits a measuring pipe inserted into the pipe, and thereby can grasp the cutting state of the original ground in real time.
The second object is to cut the ground which can smoothly and continuously move the acceleration converter fixed to the main body part arbitrarily or in conjunction with the movement of the injection nozzle of the injection tube. The third purpose is to provide a condition monitoring device. Even if the rising speed of the injection nozzle of the injection pipe, the starting point of the rising, and stop information cannot be known, it is inserted into the measuring pipe. An object of the present invention is to provide a ground cutting state monitoring device capable of causing the position of a main body portion with an acceleration transducer to follow the position of an injection nozzle.

In order to achieve the first and second objects described above, the ground cutting state monitoring device according to the invention described in claim 1 is provided.
In order to monitor the cutting state of the ground due to the solidified material sprayed at high speed from the injection nozzle of the injection pipe inserted into the ground, it is inserted into a measurement pipe embedded in the ground at a predetermined interval from the injection pipe. In the monitoring device used,
A main body held by a plurality of arms with rollers to which an expanding elasticity is applied toward the inner wall of the measuring pipe;
An acceleration transducer attached to the main body so that the sensing axis is directed vertically to the inner wall surface of the measurement pipe;
A weight provided below the main body,
A hanging wire for suspending the main body,
An electrical cable for deriving a detection signal sent from the acceleration converter to the ground side,
It is characterized in that the acceleration received by the measurement pipe by the solidified material jetted at a high speed from the jet nozzle can be detected by the acceleration converter via the arm with a roller.

According to the ground cutting state monitoring device according to the invention described in claim 1,
In order to monitor the cutting state of the ground due to the solidified material sprayed at high speed from the injection nozzle of the injection pipe inserted into the ground, it is inserted into a measurement pipe embedded in the ground at a predetermined interval from the injection pipe. In the monitoring device used,
A main body held by a plurality of arms with rollers to which an expanding elasticity is applied toward the inner wall of the measuring pipe;
An acceleration transducer attached to the main body so that the sensing axis is directed vertically to the inner wall surface of the measurement pipe;
A weight provided below the main body,
A hanging wire for suspending the main body,
An electrical cable for deriving a detection signal sent from the acceleration converter to the ground side,
Since the acceleration applied to the measurement pipe by the solidified material jetted at high speed from the spray nozzle can be detected by the acceleration converter via the arm with the roller, the first is inserted into the ground. It is possible to accurately detect during solidification that the solidified material injected from the injection nozzle of the injection pipe hits the measurement pipe inserted into the ground around the injection pipe. While creating the improved body, it is possible to grasp the outer shape of the ground improved body being created at the same time,
Secondly, the acceleration converter attached to the main body can be moved smoothly and continuously along the inner wall of the measurement pipe as the injection nozzle of the injection tube moves.

It is a longitudinal cross-sectional view which shows the structure of the principal part of the ground cutting state monitoring apparatus which concerns on the 1st Embodiment of this invention. It is a whole block diagram including the longitudinal cross-sectional structure of the cutting condition monitoring apparatus of the ground which concerns on the 2nd Embodiment of this invention. It is a whole block diagram which shows the longitudinal cross-sectional structure of the cutting condition monitoring apparatus of the ground which concerns on the 3rd Embodiment of this invention. The structure of the ground cutting state monitoring apparatus which concerns on the 4th Embodiment of this invention is shown, (a) is a longitudinal cross-sectional view which shows the structure of the whole monitoring apparatus, (b) is the inside of a storage box. The top view seen from the upper part, (c) is the front view which looked at the inside of a storage box from the front. It is a longitudinal cross-sectional view which shows the equipment set of high-pressure jet stirring construction, and the measurement pipe embed | buried adjacent to the injection pipe of this equipment. It shows the arrangement relationship between the injection pipe and the measuring pipe of the monitoring device in the equipment for high-pressure jet agitation construction, (a) is a plan view seen from above, (b) is a vertical cross-sectional view taken along the line XX. It is. It shows the state that the ground improvement body has been formed by forcibly mixing and mixing the soil and solidified material, and (a) shows the state where the ground improvement body has been formed halfway. , (B) shows a state in which the ground improvement body is formed as prescribed. It is the wave form diagram detected and processed by the acceleration converter in the ground cutting state monitoring apparatus which concerns on this invention each inserted in three measurement pipes. It is a graph which shows the prediction display image processed by the prediction conversion circuit of the ground cutting state monitoring apparatus which concerns on the 2nd Embodiment of this invention, and was displayed on the monitor part.

Hereinafter, based on an embodiment of the present invention, a ground cutting state monitoring device according to the present invention will be described in detail with reference to the drawings.
First, equipment for high-pressure injection work in which the ground cutting state monitoring device of the present invention is used will be described with reference to FIGS.
In the high-pressure jet agitation method, the solidified material is injected at a high pressure from the injection nozzle 51 at the tip thereof through the injection pipe 50 inserted into the ground, the raw ground is cut and collapsed by the powerful energy, and the solidified material and the raw soil Are forcibly stirred and mixed to form a cylindrical improvement body.
At the tip of the injection pipe 50, there are provided an injection nozzle 51 for high-pressure injection of the solidified material to the side and a water discharge port (not shown) for discharging the drilling water below.
Note that the cement is sent from the cement supply wheel 58 and the water sent from the water supply wheel 60 is pressurized by the mixing machine and high-pressure pump 59 and the solidification material is injected from the solidification material inlet 52 to the injection pipe 50. Injected into.

Further, the drilling water is sent from the water supply vehicle 60, a part is supplied to the mixing machine / high pressure pump 59, the rest is pressurized by the high pressure pump 61, and the rest is pressurized by the high pressure pump 61. Then, it is injected into the injection pipe 50 from the high-pressure water injection port 53.
The compressed air is appropriately pressurized by the compressor 62 and injected from the compressed air inlet 54.
55 is a construction machine for creating a cylindrical ground improvement body 66 (see FIG. 7) made of raw soil and solidified material in the ground via the injection pipe 50 at the upper end (ground side) of the injection pipe 50. It is.
In such a configuration, the drilling water pressurized from the water outlet at the tip of the injection pipe 50 is inserted into the ground while the injection pipe 50 is rotated by the construction machine 55.
In addition, the solidification material is injected into the side from the injection nozzle 51 at the tip of the injection tube 50 at a high pressure, and the solid material and the soil are removed by rotating the injection tube 50 while cutting and collapsing the raw ground by the strong energy. The ground improvement body 66 can be created by forcibly stirring and mixing.
Furthermore, the ground improvement body 66 can be formed in a cylindrical shape by gradually pulling up the injection tube 50.
A plurality of (in this case, three) measuring pipes 64 are embedded in or near the planned diameter of the ground improvement body 67 created in this way.
Inside the measuring pipe 64, a ground cutting state monitoring device 65 according to the present invention, which will be described later, is provided so as to be movable up and down.

[First Embodiment]
Next, the monitoring apparatus according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a longitudinal sectional view showing a configuration of a main part of a ground cutting state monitoring device according to a first embodiment of the present invention, and FIG. 2 is a diagram of the monitoring device of FIG. 1 according to a second embodiment. It is a whole lineblock diagram showing a longitudinal section configuration and a block configuration.
In FIG. 1 and FIG. 2, the main body 4 has a first roller-equipped arm 1 and a second roller-equipped arm 2 to which an expansion tension is applied toward the inner wall of the measuring pipe 64. Is pivotally supported.
The rollers 3 and 3 are pivotally supported at both ends of the first arm 1 with a roller, and move along the inner wall of the measurement pipe 64.

A spring 7 is stretched between the first arm 1 and the second arm 1 with rollers 2 between the spring hook 8 and the first arm 1 implanted in the main body 4. The roller-equipped arm 1 is spring-biased counterclockwise,
The second arm 2 with a roller is spring-biased clockwise,
In the state of being inserted into the measurement pipe 64, the four rollers 3 are given pressure expansion elasticity toward the inner wall of the measurement pipe 64, and can move in close contact.
In order to satisfy this condition, the total length of the two pairs of arms 1 and 2 with rollers, that is, (the length of arm 1) + (the radius of roller 3 × 2) is sufficiently larger than the inner diameter of measuring pipe 64. Need to be long.
Further, in the middle part of the main body part 4 in the vertical direction, the two first acceleration converters 5a and the second acceleration converters 5b are disposed on the main body part 4 at an angular relationship of 90 degrees with respect to each other when viewed from above. It is attached.
The first acceleration transducer 5a and the second acceleration transducer 5b are respectively attached to the main body 4 by screws or other means so that the sensitive axis is perpendicular to the inner wall surface of the measurement pipe 64. The outer periphery is covered with a cover member 6.
Each acceleration converter 5 (5a, 5b) outputs a detection signal corresponding to the acceleration, and the detection signal is derived to the ground side via the electric cable 14.

Suspension rings 10 and 11 are connected to the upper end and lower end of the main body 4, respectively. A suspension wire 13 for suspending the main body 4 is connected to the upper suspension ring 10, and the lower end of the suspension ring 11 is connected to the suspension ring 11. The weight 12 is connected.
The acceleration detection unit 22 including the arms 1 and 2 with rollers, the acceleration converter 5, the weight 12, and the like attached to the main body portion 4 having the above-described configuration is moved up and down by moving the suspension wire 13 up and down. It is assumed that the spring constant of the spring 7, the weight of the weight 12, the frictional force of each other part, etc. are adjusted in an integrated manner so that the can respond smoothly.

[Second Embodiment]
Next, the whole structure of the ground cutting state monitoring apparatus according to the second embodiment of the present invention will be described with reference to FIG.
In the ground cutting state monitoring apparatus according to the second embodiment, the acceleration detection unit 22 has the same configuration as that of the first embodiment of FIG. 1, but the acceleration detection unit 22 is moved up and down. For this purpose, a hoisting machine (hereinafter referred to as “electric hoisting machine”) 24, a switch 25, a predictive conversion circuit 26, a processing circuit 27, a recording unit 28, and a monitor unit 29 are added.
Here, the operation of the ground cutting state monitoring apparatus according to the second embodiment will be described together with the procedure for carrying out the jet stirring method.
First, the equipment for high-pressure jet agitation work has been described with reference to FIGS.
First, a vertical hole is drilled using boring at a plurality of points in the planned range of the ground improvement body 66 (see FIG. 7) to be created.
Three measuring pipes 64 (64A, 64B, 64C) are inserted and fixed in each vertical hole.

One measuring pipe 64 may be used, but if a plurality of measuring pipes 64 are embedded, the frequency of confrontation with the injection nozzle 51 increases, so the number of signals obtained from the acceleration converter increases and more accurate monitoring can be performed.
Next, the construction machine 55 is installed at the center of the formation position of the ground improvement body 66, and the injection pipe 50 is suspended and inserted into the construction machine 55 using a crane or the like.
And drilling water is inject | poured from the high voltage | pressure water injection port 53 of the upper end of the injection pipe 50, and it inserts to the planned depth in the ground, rotating the injection pipe 50 with the construction machine 55. FIG.
Next, as shown in FIGS. 1 and 2, a second roller is attached with the weight 12 from the upper end of each measuring pipe 64A, 64B, 64C (hereinafter collectively referred to as “64”). While maintaining the state in which the arm 2 is rotated in the counterclockwise direction so as to extend the spring 7, the arm 1 with the roller 1 is maintained in the state in which it is rotated in the clockwise direction while extending the spring 7, The entire acceleration detection unit 22 is inserted into the measurement pipe 64.
In this inserted state, the first arm 1 with a roller and the second arm 2 with a roller are pressed against the inner wall of the measuring pipe 64 by the elastic force of the springs 7 and 7, so that vibration is transmitted directly. Will receive.

At this time, since the weight of the weight 12 is set to be larger than the frictional force of the first and second roller arms 1 and 2, the weight 12 falls if the hanging wire 13 is released, but the position is adjusted. Is performed by controlling the lifting amount of the suspension wire 13, that is, the winding amount of the electric hoist 24.
Next, by injecting the solidified material at a high pressure from the injection nozzle 51 via the injection pipe 50 and rotating the injection pipe 50 at a constant speed by the construction machine 55 while cutting and collapsing the original ground by its strong impact force, The ground improvement body 66 is formed by forcibly mixing and mixing the raw soil and the solidified material.
During this time, if the solidified material injected at high pressure from the injection nozzle 51 at the tip (lower end) of the injection pipe 50 reaches each measurement pipe 64 (64A, 64B, 64C), the ground at each measurement point is cut and collapsed. Thus, the solidification material hits the measurement pipe 64 inserted at each measurement point, and an impact (vibration) is applied to each measurement pipe 64A, 64B, 64C.
The impact (acceleration) at each measurement point is converted into two acceleration converters through the first and second arms 1 and 2 with rollers and the main body 4 of the acceleration detection unit 22 inserted in each measurement pipe 64 in this order. Directly responding to vibration (acceleration) transmitted directly to 5a and 5b and received by the measurement pipe 64, an accurate acceleration is detected.

That is, the vibrations received by the measurement pipe 64 are received by the acceleration converters 5a and 5b via the rigid rollers 3, the arms 1 and 2, and the main body 4 in this order, so that there is no attenuation or spread in transmission unlike sound. There is an advantage that the impact position and the acceleration level can be accurately detected.
In this way, the acceleration (vibration) received from the measurement pipe 64 can be generated by the acceleration converters 5a and 5b arranged toward the inner wall of the measurement pipe 64 so as to be orthogonal to each other, and a detection signal corresponding to the acceleration is generated. The detection signal is transmitted to the prediction conversion circuit 26, the processing circuit 27, the recording unit 28, and the monitor unit 29 provided on the ground side via the electric cable 14.
As will be described in detail later, the predictive conversion circuit 26 amplifies the detection signal by an amplifier provided therein, converts it to a digital quantity by an A / D converter, and converts the maximum value of the digital quantity into a time series. Then, the prediction of the maximum value is calculated, the data after the prediction conversion is returned to an analog signal by the D / A converter, and output to the processing circuit 27, the recording unit 28, and the monitor unit 29.
On the other hand, the detection signals output from the acceleration converters 5a and 5b are appropriately subjected to amplification processing, A / D conversion processing, and arithmetic processing for acceleration values by the processing circuit 27, and various data are stored in the recording unit. 28 and, if necessary, to the monitor unit 29. For example, a waveform diagram (see FIG. 8) processed by the processing circuit 27 and the recording unit 28 is displayed on the monitor unit 29 based on the detection signals of the acceleration converters 5a and 5b. By confirming the waveform diagram of FIG. 8, the diameter of the ground improvement body being created can be easily determined in real time at the construction stage.

The acceleration detection unit 22 including the acceleration transducers 5a and 5b configured as described above is suspended in the measurement pipe 64 via the suspension wire 13 and is lowered and raised in association with the lowering and raising of the injection tube 50. It is supposed to be.
The hoisting wire 13 is adjusted for hoisting by an electric hoisting machine 24 via a pulley 23 provided on the ground side.
That is, when the construction of the ground improvement body in the first stage is completed, the construction machine 55 is operated, and the ground improvement body is formed in a cylindrical shape into the injection pipe 50 to the second, third stage,. (See FIGS. 6 and 7).
In the meantime, at each stage, the vibration (impact) hitting the solidifying material against the measurement pipe 64 can be accurately monitored by the acceleration converters 5a and 5b of the acceleration detection unit 22.

The minute output signals output from the acceleration converters 5a and 5b are input to the processing circuit 27, amplified by an amplifier, further converted into digital data by an A / D converter, and acceleration data is calculated by an arithmetic circuit. Are stored in the recording unit 28. The acceleration data obtained by the processing circuit 27 is stored as a digital value and also as analog data. If necessary, the monitor unit 29 displays the acceleration value numerically in real time, or displays the acceleration data. Waveform data can be displayed in real time.
On the other hand, the vertical position of the main body 4 to which the acceleration converters 5a and 5b are attached is adjusted by the electric hoist 24 through the suspension 13, for example, as shown in FIG. In the second embodiment, the vertical position (hereinafter referred to as “sensor position”) of the acceleration converters 5 a and 5 b is collided with the measurement pipe 64 by the solidified material injected at high pressure from the injection nozzle 51. If the position coincides with the position (hereinafter referred to as “collision position”), the maximum acceleration level is detected. However, if the sensor position deviates from the collision position, the acceleration level decreases. By applying this, the prediction conversion circuit 26 amplifies the detection signal of the acceleration converter, accumulates the maximum value of the A / D converted digital value in time series, and predicts the maximum value by the monitor unit 29. On the top, it is displayed in an easy-to-understand format such as a graph as shown in FIG. Accordingly, it is visually confirmed that the maximum value starts to decrease, and the switch 25 that controls the electric hoist 24 is operated in the winding direction (upward direction) so that the detection signal becomes large.

Here, a circuit for controlling the hoisting of the electric hoist 24 will be described in detail.
First, the predictive conversion circuit 26
An amplifier for amplifying the detection signals of the acceleration converters 5a and 5b;
An A / D converter for converting an analog signal of the amplifier into a digital signal;
A recording unit for accumulating the maximum value of the digital signal in time series;
Calculate the increase / decrease from each maximum value accumulated in the recording unit multiple times, judge the numerical trend, average the maximum value, and predict the up and down based on the averaged digital numerical value An arithmetic circuit for performing
A D / A converter that converts a predicted digital value output from the arithmetic circuit into an analog voltage;
Have
A monitor unit 29 for receiving an output from the D / A converter of the prediction conversion circuit 26 and displaying a prediction display image;
And a switch 25 for controlling energization of the hoisting machine 24 that moves the hanging wire 13 up and down.

Based on the prediction display of the monitor unit 29, the switch 25 can be operated to follow the vertical movement of the injection nozzle.
That is, an example of the prediction display of the monitor unit 29 will be described with reference to FIG.
In FIG. 9, the horizontal axis represents time (minutes), and the vertical axis represents voltage.
An example of the predicted display image output from the D / A converter in the predictive conversion circuit 26 is as shown in FIG. 9. For example, during the period from the time point t1 to the time point t2, the sensor position is “collision position”. The voltage drop in the process of shifting in the vertical direction from the “sensor position” (time point t1) facing “” is shown. During this time, the winding is in a stopped state.
When the time t2 is reached, the “sensor position” is greatly deviated from the “collision position”, so the switch 25 is operated to drive and control the hoisting machine 24 in the direction in which the acceleration detection unit 22 is raised, Continue until time t3.
When reaching the time point t3, the “sensor position” and the “collision position” face each other (closest to each other), and therefore the voltage value becomes maximum. Therefore, the switch 25 is operated and the suspension wire 13 by the hoisting machine 24 is operated. Stop the hoisting operation.

From the time point t3 to the time point t4, the “sensor position” moves away from the “collision position”, and thus the voltage decreases. At time t4, the switch 25 is operated again to control the hoisting machine 24 in the upward direction.
Then, since the “sensor position” gradually approaches the “collision position”, the voltage rises and the voltage value reaches the maximum value at time t5. Therefore, the switch 25 is operated to stop the winding machine 24 from rotating.
With such a configuration, even if information regarding the vertical movement of the injection nozzle 51 cannot be obtained, the injection nozzle is provided with the prediction conversion circuit 26, the processing circuit 27, the recording unit 28, the monitor unit 29, and the like. The vertical position of the acceleration converters 5a and 5b can be made to follow the vertical position of 51.

Of course, when the injection nozzle 51 has a structure that rises at a constant speed, for example, the acceleration speed of the acceleration converters 5a and 5b by the electric hoist 24 is set to be a constant winding speed. You can also.
In that case, when the decrease in the maximum value is confirmed based on the prediction information obtained by the prediction conversion circuit 26 described above, the switch 25 is operated so as to increase the rotation speed of the electric hoist 24, and the reverse At this stage of operation, the sensor position is excessively raised from the collision position, and the maximum value decreases again. Therefore, the switch 25 is operated so as to reduce the rotational speed of the electric hoist 24.
As the above-described acceleration converter 5, the first acceleration converter 5a and the second acceleration converter 5b are composed of two, for example, each of the first acceleration converters is perpendicular to the inner wall of the measurement pipe 64. And the second acceleration converter 5b (Y-axis direction) with respect to the direction of the acceleration converter 5a (X-axis direction) as viewed from above at an interval of 90 degrees. It is attached to the main body 4 at a distance.

In this way, the first acceleration converter 5a is attached to the main body 4 in the X-axis direction and the second acceleration converter 5b in the Y-direction orthogonal to the X-axis, and is connected to both acceleration converters 5a and 5b. By connecting two electrical cables in parallel (for example, two bridge circuits connected in parallel), a combined signal of the acceleration signal in the X-axis direction and the acceleration signal in the Y-axis direction can be obtained. There are advantages that detection is possible and that only one amplifier or A / D converter is required.
The monitor unit 29 receives the detection signals of the acceleration converters 5a and 5b and the signals processed by the processing circuit 27, and displays the waveform graph of the acceleration data in real time.
On the other hand, the monitor unit 29 receives detection signals from the acceleration converters 5a and 5b and outputs a prediction display signal indicating amplification, A / D conversion, maximum value accumulation, and decrease in the maximum value. It is desirable to display the prediction display in the form of a broken line display, for example.

[Third Embodiment]
Next, a ground cutting state monitoring apparatus according to a third embodiment of the present invention will be described with reference to FIG.
The ground cutting state monitoring apparatus according to the third embodiment has two main body parts 4 including acceleration converters 5a and 5b, and arms 1 and 2 with rollers, each having a hanging ring 11 in a vertical line. In a state of being connected and inserted into the measurement pipe 64, the acceleration transducers 5a and 5b provided in the upper and lower two stages (a total of four acceleration transducers 5a and 6b directed in the X-axis direction and the Y-axis direction are combined). ) Detection signals are input to the automatic hoisting device 31.
In the automatic hoisting device 31, detection signals from the acceleration converters 5a and 5b connected in a vertical row in the upper and lower two stages are amplified by an amplifier 32, A / D converted by a controller 33, 2 When the signal level of the acceleration converter provided in the upper direction (upper stage) is large, for example, the servo When the servo motor 34 is rotated by the motor 34 in the upward direction of the main body 4 and the outputs of the acceleration converters 5a and 5b provided in the upper and lower two stages are equal or within a certain range, the servo motor It is comprised so that rotation of 34 may be stopped.

On the other hand, for example, when it is determined that the detection signal output from the acceleration converters 5a and 5b provided in the lower stage has a higher level, the servo motor 34 is controlled, and the main body 4 is controlled. In the process, the rotation of the servo motor 34 is stopped when the outputs of the upper and lower acceleration converters become equal or within a certain range.
In FIG. 3, the acceleration detection units 30 arranged in the upper and lower stages are duplicated because the acceleration detection units 22 shown in FIG. 1 and FIG. Description is omitted.
In addition, the processing circuit 27, the recording unit 28, and the monitor unit 29 in the third embodiment have the same configuration as that of the second embodiment, but an analog signal is supplied from the processing circuit 27 to the automatic hoisting device 31. Is different.
According to the ground cutting state monitoring apparatus according to the third embodiment configured as described above, the rising speed of the injection nozzle 51 of the injection pipe 50, the rising start time, stop information, etc. cannot be known. Even if it exists, the position of the main-body part 4 with the acceleration converters 5a and 5b inserted in the measurement pipe 64 can be made to follow the position of the injection nozzle 51 smoothly and automatically.

[Fourth Embodiment]
Next, a ground cutting state monitoring apparatus according to a fourth embodiment of the present invention will be described with reference to FIG.
4A is a longitudinal sectional view showing the configuration of the main part of the cutting state monitoring device, FIG. 4B is a plan view of the inside of the storage box 47 as viewed from above, and FIG. 4C is the storage box 47. It is the front view which looked at the inside from the front.
In the fourth embodiment, only the configuration of the acceleration detection unit according to the first to third embodiments is different.
That is, in the acceleration detection unit 40 according to the fourth embodiment of the present invention, the arm with rollers is composed of three sets, the arm 41 with the first roller (44), and the arm 42 with the second roller (44). Are attached to the main body 46 in the same direction (in the right direction in FIG. 4A) at a predetermined interval, and the arm 43 with the third roller (44) is an arm with the first and second rollers. 41 and 42 are attached to the main body portion 46 on the 180-degree reflection side so as to be swingable, so that the arm 43 with the third roller expands outward, that is, presses the inner wall of the measuring pipe 64. Further, a spring 48 as an elastic member is configured to be suspended between a spring hook 49 planted on the main body 46 and the third arm 43 with a roller.
A weight 12 having a predetermined weight is connected to the lower end of the main body 46 via a suspension ring 11.

As shown in FIG. 4B, of the two acceleration transducers, the first acceleration transducer 45a is attached to the main body 46 so that the direction of sensitivity is perpendicular to the inner wall of the measurement pipe 64. The second acceleration converter 45b is attached to the first acceleration converter 45a at an interval of 90 degrees as viewed from above.
Thus, by arranging the two acceleration converters 45a and 45b so as to be shifted by 90 degrees, stable measurement can be performed regardless of the rotation of the acceleration detection unit 40 in the measurement pipe 64.
The detection signals output from the acceleration converters 45a and 45b of the acceleration detection unit 40 in the fourth embodiment are sent to the processing circuit 27, the recording unit 28, and the monitor unit 29 in the same manner as the signal processing shown in FIG. Since they are used and processed in the same manner, repeated description is omitted.
Although not shown, a rotation pulse generator is attached to the rotation shaft of the pulley 23 shown in FIGS. 2 and 13 or another pulley on which the hanging wire 13 is stretched, and the output of the rotation pulse generator. Is provided to monitor the amount of movement of the suspending wire 13, and hence the amount of movement of the main body 4, and associate the height position information of the waveform diagram with the detection signal of the acceleration converter. It can also be recorded.

1 First arm (arm with roller)
2 Second arm 3 Roller 4 Body 5 Acceleration converter 5a First acceleration converter 5b Second acceleration converter 6 Cover member 7 Spring (elastic member)
8 Spring hook 9 Support shaft 10, 11 Suspension ring 12 Weight 13 Suspension wire 14 Electric cable 15 Pulley 22 First acceleration detection unit 23 Pulley 24 Electric hoist 25 Switch 26 Predictive conversion circuit 27 Processing circuit 28 Recording unit 29 Monitor Part 30 Acceleration detection unit 31 Third embodiment 31 Automatic hoisting device 32 Amplifier 33 Controller 34 Servo motor 40 Fourth acceleration detection unit 41 Arm with first roller 42 Arm with second roller 43 Third roller Arms 44 Rollers 45, 45a, 45b Accelerometer 46 Main body 46a Support shaft 47 Storage box 48 Spring 49 Spring hook 64 Measuring pipe

Claims (10)

In order to monitor the cutting state of the ground due to the solidified material sprayed at high speed from the injection nozzle of the injection pipe inserted into the ground, it is inserted into a measurement pipe embedded in the ground at a predetermined interval from the injection pipe. In the monitoring device used,
A main body held by a plurality of arms with rollers to which an expanding elasticity is applied toward the inner wall of the measuring pipe;
An acceleration transducer attached to the main body so that the sensing axis is directed vertically to the inner wall surface of the measurement pipe;
A weight provided below the main body,
A hanging wire for suspending the main body,
An electrical cable for deriving a detection signal sent from the acceleration converter to the ground side,
A ground cutting state monitoring device configured to be able to detect the acceleration received by the measurement pipe by the solidified material jetted at high speed from the spray nozzle by the acceleration converter via the arm with a roller. The arm with roller is composed of two sets, each supporting a roller at both ends, and an intermediate part is attached to the main body part so as to be swingable at a predetermined interval, and its total length is the measuring pipe. Is set larger than the inner diameter of
The ground cutting state monitoring device according to claim 1, wherein an elastic member is provided between the arm and the main body, and the roller presses an inner wall of the measurement pipe.   The arm with roller is composed of three sets, the first and second arm with roller are attached to the main body in the same direction at a predetermined interval, and the third arm with roller is the first and second arms. An elastic member is attached to the main body portion and the first arm so as to be swingably attached to the main body portion on a side opposite to the second roller-equipped arm by 180 degrees, and the third roller-equipped arm extends outward. The ground cutting state monitoring device according to claim 1, wherein the ground cutting state monitoring device is configured to be suspended between three arm with rollers.   The acceleration converter is composed of two, and the first acceleration converter is attached to the main body so that the sensing direction is perpendicular to the inner wall of the measurement pipe, and the second acceleration converter is 2. The ground cutting state monitoring device according to claim 1, wherein the ground acceleration state monitoring device is attached to the first acceleration transducer at an interval of 90 degrees as viewed from above.   The acceleration detection unit comprising the acceleration converter, the arm with roller, and the main body is connected in series in the vertical direction in the measurement pipe in two sets. The ground cutting state monitoring device according to item. On the ground side where the measurement pipe is buried,
A hoisting machine that moves the hanging wire up and down; and a controller that controls the rotation of a motor that drives the hoisting machine;
A processing circuit that receives a detection signal output from the acceleration converter via the electric cable, appropriately performs amplification processing, A / D conversion processing, and arithmetic processing, and calculates an acceleration value;
The ground cutting state monitoring device according to claim 1, wherein the ground cutting state monitoring device is provided.   The controller is configured to be linked to the vertical movement speed of the injection nozzle of the injection pipe inserted in the ground provided separately or to control the rotation of the motor in accordance with the movement speed. The ground cutting state monitoring device according to claim 6. An amplifier for amplifying a detection signal from the acceleration converter;
An A / D converter for converting an analog signal of the amplifier into a digital signal;
A recording unit for accumulating the maximum value of the digital signal in time series;
Calculate the increase / decrease from each maximum value accumulated in the recording unit multiple times, judge the numerical trend, average the maximum value, and predict the up and down based on the averaged digital numerical value A D / A converter that converts the predicted digital value output from the calculation circuit into an analog voltage;
And a predictive conversion circuit having
A monitor unit that receives the output from the D / A converter and displays a predicted display image;
A manual switch for energization control of the hoist you move up and down the suspension wire,
Further comprising
The cutting state monitoring apparatus according to claim 1, wherein the cutting state monitoring apparatus is configured to be able to follow up and down movement of the injection nozzle by operating the manual switch based on a prediction display of the monitor unit. Two acceleration detection units composed of the acceleration converter and the arm with the roller are connected in a vertical line in the vertical direction and inserted into the measurement pipe, and the detection signals of the two upper and lower acceleration converters was treated respectively compare the two detection signals, said main body portion in a direction acceleration greater converter output signal is provided is configured to control the rotation of the motors to move The ground cutting state monitoring device according to claim 5, wherein the ground cutting state monitoring device is provided.   The ground cutting state monitoring device according to claim 6, further comprising a monitor that receives an output of the processing circuit and displays an output waveform of the acceleration converter in real time.

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