JP2019191024A - Measuring method and measuring device for underground sound source position - Google Patents

Abstract

To provide a measuring method and a measuring device for detecting a sound generated in a sound source only with a sensor provided on the ground surface that can perform ground sound source positioning without taking a priced cost and measurement time by analyzing this without providing a sensor or an artificial sound source in the ground.SOLUTION: Data recording means 9 identifies an individual sound 11 generated at a sound source position 5 in the ground 2 and records them with a frequency component, and has at least three sensors 7 arranged on the ground surface 3, the sensor 7 detects sound information including sound waves in which the individual sounds 11 reach the ground surface 3 by propagating in the ground 2, filters the sound information detected by the sensor 7 by the data recording means 9 to remove specific frequency components to identify the individual sound 11, and the analysis means 9 measures the underground sound source position to three-dimensionally identify the position of the sound source S1 by the phase difference between the identified individual sounds 11, 12, 13 of the respective sensor 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a measurement method and a measurement apparatus for specifying a position where underground sound is generated by detecting underground sound generated from a sound source in the ground with a sensor.

  2. Description of the Related Art Conventionally, an underground sound source position measuring apparatus and measuring method for specifying a ground improvement position in a ground, a position of a drilling rod, and the like have been proposed.

  As such a technique, apart from the position of the improved range, a technique is known in which a sensor is installed in a hole excavated in the ground in advance to check the improved range (for example, see Patent Document 1). In this technique, a sensor installed in another hole detects the sound of the ground improvement agent sprayed into the ground and identifies the ground improvement position.

  In addition, a technique has been proposed in which an artificial sound source is installed at the tip of the excavation rod of the excavation construction machine and the underground sound generated by the artificial sound source is detected by a sensor (see, for example, Patent Documents 2 and 3). . In this technology, underground sound generated from an artificial sound source propagates through the ground, and when it reaches the ground surface, multiple sensors detect the sound waves and calculate the phase difference of the sound waves detected by multiple sensors. The position of the excavation rod is specified by the calculation by the apparatus.

JP2012-62626 JP2012-58025A JP2012-58038

  However, in the measurement method of the underground sound source position described in Patent Document 1, it is necessary to excavate another hole in the ground in order to install the sensor in the ground. There has been a problem that the number of processes takes a lot.

  Moreover, in the method for measuring the position of the underground sound source described in Patent Documents 2 and 3, it is necessary not only to provide a plurality of sensors on the ground surface, but also to provide an artificial sound source on the cutting rod of the excavation machine. The problem was that the price cost of the measurement increased.

  Therefore, the present invention generates a sound source using only a sensor with the minimum configuration, without providing a sensor with a separate hole in the ground or providing an artificial sound source at the tip of a drilling rod of a drilling machine. It is an object of the present invention to provide an underground sound source position measuring method and a measuring apparatus that can be performed without detecting the sound to be analyzed and analyzing the sound without multiplying the cost and the number of measurement steps.

  In view of the above problems, the invention described in claim 1 is characterized in that an individual sound generated at a sound source position in the ground is specified by a frequency component and recorded in data recording means, and at least three sensors are provided. Disposed on the ground surface, the sensor detects sound information including sound waves that propagate through the ground and reach the ground surface, and the sound information detected by the sensor is filtered by the data recording means. The specific sound component is extracted to identify the individual sound, and the analysis means determines the sound source position three-dimensionally based on the phase difference of the identified individual sound of each of the sensors. It is characterized by the method.

  Further, the invention according to claim 2 is characterized in that a solid sound generated at a sound source position in the ground and generated when a predetermined liquid hits the ground is specified by a frequency component and recorded in a data recording means. The predetermined liquid is ejected in a substantially horizontal direction from an ejecting portion provided at a position dug down by a predetermined length in the vertical direction, and at least two sensors are arranged on the ground surface, Sound information including sound waves propagating in the ground and reaching the ground surface is detected, and the sound information detected by the sensor is filtered by the data recording means to extract a specific frequency component and the individual sound The analysis means determines the sound source position in a three-dimensional manner based on the phase difference of the individual sound specified by each of the sensors and the vertical length of the ejection unit from the ground surface. Characterized in that the measuring method of ground source position specified.

  Furthermore, the invention described in claim 3 is a method for measuring the position of an underground sound source in which the sensor is arranged in close contact with or buried in the ground in addition to the configuration described in claim 1 or 2. It is characterized by that.

  Furthermore, the invention according to claim 4 is arranged on the ground surface with data recording means for recording the individual sound generated at the sound source position in the ground by specifying the frequency component, and the individual sound is the ground A plurality of sensors that detect sound information including sound waves that propagate through the ground and reach the ground surface, and the sound information detected by the sensors is filtered by the data recording means to extract specific frequency components. An underground sound source position measuring device that is adapted to identify the individual sound and has analysis means for three-dimensionally identifying the sound source position based on the phase difference between the identified individual sounds of the sensors. It is characterized by that.

  According to the invention described in claim 1 or 4, at least three sensors are arranged on the ground surface, sound information detected by the sensors is filtered by the data recording means, and a specific frequency component is extracted to obtain an individual sound. The identification and analysis means identify the sound source position by the phase difference of the identified solid sound of each sensor, so that the individual sound source can be obtained only by the surface sensor without installing the sensor and the artificial sound source in the ground. Sound can be detected, and the sound source position can be specified in three dimensions without multiplying the cost of the measuring device and the number of measurement steps.

  According to the second aspect of the present invention, at least two sensors are applied to the ground surface for the individual sound generated by spraying liquid from the spraying part whose vertical length is known by boring and hitting the ground. The sound information detected by the sensor is filtered by the data recording means to extract a specific frequency component to identify the individual sound, and the analysis means determines the phase difference of each identified solid sound and the injection unit The price of the measuring device is determined by detecting the individual sound of the sound source only by the depth of the ground surface sensor and the injection part, without installing a sensor and an artificial sound source in the ground in order to specify the sound source position by the depth. It is possible to specify the sound source position in three dimensions without multiplying the cost and the number of measurement steps.

  According to the third aspect of the invention, the individual sound at the sound source position can be detected more accurately by arranging the sensor in close contact with the ground or buried in the ground.

It is a schematic diagram of the underground sound source position measuring apparatus in the injection system ground improvement method according to Embodiment 1 of the present invention. It is a block diagram of a sensor, an amplifier, and a data recording / analysis device of the underground sound source position measuring device according to the first embodiment. It is a figure which shows the superimposition waveform of the sound source S1 which the sensor of the underground sound source position measuring device which concerns on the same Embodiment 1 detected. It is the figure which carried out the Fourier transformation of the superposition | polymerization waveform of the sound source S1 which the sensor of the underground sound source position measuring device which concerns on the same Embodiment 1 detected, and showed it with the waveform of the frequency domain. The frequency domain waveform of the sound source S1 in the frequency domain detected by the sensor of the underground sound source position measuring apparatus according to the first embodiment is inversely Fourier transformed and shown in the time domain, (a) to (c). Are examples of different waveforms of specific frequency components of the sound source S1. It is the schematic explaining the principle which the data recording and analysis apparatus which concerns on the same Embodiment 1 specifies the position of a ground improvement agent. It is a schematic diagram of the underground sound source position measuring device in specifying the tip position of the excavation rod of the boring machine according to Embodiment 2 of the present invention.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention
1 to 6 show a first embodiment of the present invention.

  As shown in FIG. 1, the underground sound source position measuring apparatus 100 according to the first embodiment injects a ground conditioner at a high pressure from a ground conditioner injection position 4 at the tip of a rod of the construction machine 1 to improve the ground. In the injection system ground improvement method for performing the above, the position of the ground improvement agent as the sound source is specified. In the first embodiment, the underground sound source position measuring apparatus 100 is configured to generate an individual sound generated when the ground improving agent injected at a high speed on the extended portion of the improved range hits the ground 2. The position of the ground improvement agent is specified by detecting and analyzing with the six sensors 7 installed in the.

  Moreover, in this Embodiment 1, as shown in FIG. 1, the ground improvement agent is injected in one place in the ground 2, and the sound information captured by the sensor 7 includes a sound source S1 described later. Yes.

  Further, in the first embodiment, sound information is detected in a state where the ground improving agent is sprayed into the ground 2, and the ground improving agent is moving in the ground 2. The sound source position is measured.

  The underground sound source position measuring apparatus 100 according to the first embodiment generates sound waves that reach the ground surface 3 including the individual sound 11 generated at the individual sound generation position 5 as the sound source position, as shown in FIG. Sensor 7 that detects as information and transmits the signal of the sound information, amplifier 8 that amplifies the signal of sensor 7, receives the signal amplified by amplifier 8, records the data, analyzes it, and analyzes the ground improvement agent A data recording / analyzing device 9 for specifying the position is provided. In the first embodiment, the data recording / analyzing device 9 is a device having both data recording means and analyzing means.

  The sensor 7 detects sounds having a wide frequency range from 20 Hz to 20000 Hz that can measure individual sounds. In the first embodiment, a sound field sound pressure type microphone is provided. The sensor 7 may be not only a sound field sound pressure type microphone but also a sound field sound pressure type geophone or an accelerometer. As shown in FIG. 1, six sensors 7 are provided in a planar array form on the ground surface 3 to detect three-dimensionally spread individual sounds via the individual sound propagation path 6 in the ground 2. . Further, these sensors 7 detect the individual sound 11 generated by the ground improvement agent as the sound source S1 at the individual sound generation position 5, and the noise generated by the individual sound 11 of the sound source S1 shown in FIG. 3 is transmitted to the data recording / analyzing device 9 via the amplifier 8 as sound information (in this case, converted into a signal) as shown in FIG.

  On the other hand, as shown in FIG. 2, the amplifier 8 is connected to each of the six sensors 7, amplifies the signal of the individual sound 11 detected and transmitted by each sensor 7, and sends it to the data recording / analyzing device 9. Configured to send.

  On the other hand, the data recording / analyzing device 9 receives the sound wave signal of the individual sound 11 amplified by the amplifier 8, performs A / D conversion, separates each frequency component, and a plurality of individual sounds in real time. 11 is provided with a computer that analyzes specific frequency components and phases possessed by 11 and identifies individual sound generation positions 5 of the respective ground improvement agents.

  As shown in FIG. 3, the data recording / analyzing device 9 receives signals from the six sensors 7 by this computer in the time domain where the horizontal axis is the detection time and the vertical axis is the component of voltage, current, etc. The waveform of the sound source S1 is configured to be detected as a superposed waveform.

  Further, this computer is configured to perform Fourier transform on the time domain waveform of the sound source S1 and to calculate a frequency domain waveform having a frequency component on the horizontal axis and an amplitude or phase on the vertical axis, as shown in FIG. Has been.

  Further, this computer records a plurality of characteristic specific frequencies of the individual sound 11 generated on the contact surface between the ground improvement agent and the ground. The computer analyzes the specific frequency component 11 of the sound source S1 by comparing the characteristic frequency recorded with the frequency having the amplitude in the waveform of the sound source S1 as shown in FIG. By filtering the waveforms of the other frequency components among the waveforms in this frequency domain, the specific frequency component 11 of the sound source S1, the specific frequency component 12 of the sound source S2, which is a characteristic frequency component of each sound source, The waveform of only the specific frequency component 13 of S3 is separated and extracted.

  Further, the computer performs inverse Fourier transform on the waveform in the frequency domain of the specific frequency component 11 of the sound source S1 extracted separately, as shown in FIGS. 5A, 5B, and 5C, respectively. The time domain waveform is calculated.

  Furthermore, the computer filters and separates and extracts the specific frequency component 11 of the sound source S1 from each of the sound wave waveforms of the individual sound of the sound source S1 detected by the six sensors 7, and FIG. Each of the sound source waveforms as shown in (a), (b), and (c) is detected six by six.

  Further, the computer analyzes the difference in the phase of the time component in the horizontal axis direction of the waveform of each of the six sound sources S1 obtained by analyzing the signals from the sensors 7, and the ground improver that is the sound source S1. It is comprised so that each position may be specified. The principle and analysis procedure by which the data recording / analyzing apparatus identifies the position of the ground improvement agent by the computer will be described in detail in the measuring method.

  Further, the data recording / analyzing device 9 records the frequency data of the individual sound 11 generated on the contact surface between the ground improvement agent of a plurality of types having different components and the ground 2, and the individual sound 11 is recorded by a computer. Is compared with the frequency characteristics of a specific frequency component possessed, and the material characteristics of the ground improvement agent such as the hardness and the material component of the ground improvement agent are specified.

  Further, the data recording / analyzing device 9 uses a computer to analyze the signal of the solid sound 11 generated on the contact surface when the ground improving agent that is sprayed and constantly moves in the ground 2 collides with the ground 2 to identify the position. Is configured to do.

  Next, a measurement method by the underground sound source position measurement apparatus 100 according to the first embodiment will be described.

  First, the worker arranges the sensors 7a, 7b, 7c, 7d, 7e, and 7f on the ground surface. At this time, it is preferable that the sensors 7a, 7b, 7c, 7d, 7e, 7f are in close contact with the ground or buried in the ground. In the case of a sensor having a protrusion, the protrusion may be pierced into the ground. The sensor 7, the amplifier 8, and the data recording / analysis device 9 of the measurement device 100 for the underground sound source position are activated. Next, as shown in FIG. 1, the operator sprays the ground improvement agent from the improvement agent injection position 4 of the excavation rod of the construction machine 1. The injected ground improving agent collides with the ground 2 as the sound source S1, and the individual sound generation position 5 which is a contact surface thereof becomes the sound source S1 to generate the individual sound 11.

  These individual sounds 11 propagate through the individual sound propagation path 6 in the ground 2 and reach the ground surface 3. Sensors 7a, 7b, 7c, 7d, 7e, and 7f detect sound information of sound waves including the individual sound 11 of the sound source S1 that has propagated to the ground surface 3, and the sensors 7a, 7b, 7c, 7d, 7e, and 7f are detected. Transmits a sound information signal including individual sounds 11, 12, and 13. As shown in FIG. 2, the transmitted signal is amplified by an amplifier 8 connected to the sensor 7 and received by a data recording / analyzing device 9 connected to the amplifier 8.

  The data recording / analyzing device 9 uses the signal of the information of the sound source S1 received from the sensor 7 as shown in FIG. This is detected by overlapping waveforms of sound waves.

  The data recording / analyzing device 9 uses a computer to Fourier-transform the signal of the waveform in the time domain of the sound source S1, and as shown in FIG. 4, the frequency domain with the horizontal axis as the frequency component and the vertical axis as the amplitude or phase. To calculate the waveform.

  Further, the data recording / analyzing device 9 makes contact between the ground improvement agent and the ground recorded in advance with respect to a frequency having an amplitude in the waveform of the sound source S1 in the frequency domain as shown in FIG. Filtering is performed so as to extract a specific frequency characteristic of the individual sound generated on the surface, and a substantially matching one is extracted. The waveform of only the specific frequency component 11 of the sound source S1 that substantially matches the characteristic specific frequency is separated and extracted.

  Furthermore, the data recording / analyzing device 9 performs inverse Fourier transform on the frequency domain waveform of the specific frequency component 11 of the sound source S1 extracted by the computer, and performs (a), (b), FIG. A sound source waveform as shown in (c) is extracted. Since the waveforms of these sound sources are detected by the six sensors 7a, 7b, 7c, 7d, 7e, and 7f, six of them are extracted. Further, in the six extracted sound source S1 waveforms, the distance between the ground improvement agent as the sound source and each sensor 7 is different, and therefore the phase of the time component on the horizontal axis is different due to the difference in propagation time. Specifically, the sound source position can be specified three-dimensionally by extracting three of the six sensors and viewing the phase difference. If this operation is performed a plurality of times with three different sensors and an average is taken, a more accurate sound source position can be specified.

  Here, the principle that the computer of the data recording / analyzing device 9 analyzes the phase difference of the time components in the horizontal axis direction of the waveforms of the six sound sources and identifies the position of the ground improvement agent is shown in FIG. I will explain. In FIG. 6, a configuration principle for identifying the position of the ground improvement agent by analyzing the phase difference between the two waveforms of the sound source S <b> 1 that is the ground improvement agent by the sensor 7 a and the sensor 7 b will be briefly described.

  The computer analyzes the time component in the horizontal axis direction of the waveform of each sound source S1 obtained from the sensors 7a and 7b, and detects each sensor 7a and 7b from the time from the measurement start time until the waveform starts to be displayed. The propagation time of the individual sound of the sound source S1 until calculation is calculated. From this propagation time and the frequency of the waveform, the distance 1 from the sensor 7a to the sound source S1 and the distance (l + d) from the sensor 7b to the sound source S1 are calculated. The waveform of the sound source S1 obtained from the sensors 7a and 7b has a phase difference in the time component in the horizontal axis direction. The difference in propagation time can be analyzed from the difference in phase, and the sensors 7a and 7b can be analyzed from the difference in propagation time. The distance difference d from the sound source S1 is calculated.

  Further, the computer stores data on the position coordinates of each sensor 7. The computer calculates the relative distance w between the sensors 7a and 7b from the position coordinate data of the sensors 7a and 7b.

  This computer calculates the distance l from the sensor 7a to the sound source S1, the distance (l + d) from the sensor 7b to the sound source S1, the relative distance w between the sensor 7a and the sensor 7b, and the vertical distance between the sound source S1 and the ground surface. Using the distance z of the line segment, the vertical line segment, and the distance x to the sensor 7a, the position of the sound source S1, which is a ground improvement agent, is calculated by the well-known Pythagorean theorem.

図６には示していないが、二つのセンサ７ａ，７ｂの線を結ぶ線の垂直平面と音源Ｓ１の位置には、奥行き方向にずれがあるため、奥行き方向をｙ軸として、センサ７ａ，７ｂの線を結ぶ垂直平面から音源Ｓ１の位置までのｙ軸方向の距離をｙとすると、以下の［数２］の式になる。
［数２］

ｄは地盤中の音の伝播速度に依存するので、ｄ、ｘ、ｙ、ｚという要素によって曲面が形成される。 Using the components of l, w, z, and x, from the well-known Pythagorean theorem,
x ² + z ² = l ²
(W−x) ² + z ² = (l + d) ²
The following equation holds. When this formula is expanded and arranged, the following formula (1) is obtained.
[Equation 1]

Although not shown in FIG. 6, the vertical plane of the line connecting the lines of the two sensors 7a and 7b and the position of the sound source S1 are misaligned in the depth direction. Therefore, the sensors 7a and 7b have the depth direction as the y axis. If the distance in the y-axis direction from the vertical plane connecting the lines to the position of the sound source S1 is y, the following [Equation 2] is obtained.
[Equation 2]

Since d depends on the propagation speed of sound in the ground, a curved surface is formed by the elements d, x, y, and z.

  Similarly, the computer calculates from the relative distance between the two sensors 7 of the sensors 7a, 7b, 7c, 7d, 7e, 7f and the phase difference of the waveform of the sound source S1 from the two sensors 7, d, A large number of curved surfaces are formed by x, y, and z elements, and the points where these curved surfaces intersect are analyzed. The computer specifies the point where the plurality of curved surfaces intersect as the position of the sound source S1 that is the ground improvement agent.

  In this way, the data recording / analyzing device 9 performs A / D conversion on the signal detected by the sensor 7, performs frequency analysis and phase analysis by a computer, and generates individual sound generation positions of a plurality of ground improvement agents in real time. 5 is specified.

  In addition, the data recording / analyzing apparatus 9 uses a computer to extract the specific frequency component 11 of the extracted sound source S1 and the frequency of the individual sound 11 generated on the contact surface between the ground improvement agent and a plurality of types of ground improvement agents having different components. Compared with the above data, the hardness and material composition of the ground in contact with the ground improvement agent are specified. In this way, if you have data that specifies the hardness and material components that the ground improvement agent contacts, you can determine whether it is in contact with the ground improvement body that has been constructed, and this allows you to manage the shape It can be done.

  Further, during the operation of the injection system ground improvement method, the ground improvement agent is always injected into the ground 2, and therefore the position of the ground improvement agent is constantly moving. The data recording / analyzing apparatus 9 sequentially detects the sound waves of the individual sound of the ground improvement agent by the sensor 7 and analyzes the transmitted signals to identify the position of the ground improvement agent that moves.

  The worker confirms the position of the moving ground improver identified by the data recording / analyzing device 9 and the hardness and material components of the ground improver, and proceeds with the work process.

  As described above, according to the measurement apparatus 100 and the measurement method of the underground sound source position according to the first embodiment, a plurality of sound field sound pressure type microphones that detect sound waves in a wide range of frequencies as the sensor 7 are arranged in a planar array. In order to identify the individual sound 11 of the sound source S1 recorded by the data recording / analysis device 9 based on the sound information detected on the ground surface 3 and detected by the sensor 7, and to specify the position of the sound source S1, Without installing another sensor or artificial sound source device in the ground 2, the solid sound 11 of the sound source S1 can be detected only by the sensor 7 on the ground surface 3, and the cost of the measuring device and the number of measurement steps are not applied. In addition, the position of the ground improvement agent can be specified in three dimensions.

  Further, in this underground sound source position measuring device 100 and measuring method, the data recording / analyzing device 9 filters the sound information detected by the sensor 7, and the contact surface between the ground improving agent as the sound source S1 and the ground 2 The characteristic specific frequency component of the individual sound 11 generated in step 1 is separated and detected. Therefore, a specific frequency of the individual sound 11 by the sound source S1 can be selected and detected without being disturbed by noise in the ground 2, and the position of the sound source S1 can be accurately specified.

  Also, in this underground sound source position measuring device 100 and measuring method, the data recording / analyzing device 9 filters the sound information detected by the sensor 7 to specify the characteristic identification of the individual sound 11 generated by the sound source S1. Therefore, the position of the sound source S1 can be specified with high accuracy.

  Further, in this underground sound source position measuring device 100 and measuring method, the data recording / analyzing device 9 performs A / D conversion on sound information detected by the plurality of sensors 7, and performs frequency analysis and phase analysis of the sound source S1 by a computer. In order to identify the position of the soil conditioner in the ground 2 in real time, the operator can confirm the position of the ground conditioner during the injection-type ground surcharge process, and the progress of the process. It is possible to take measures such as confirming the process and reviewing the process.

  Furthermore, in this underground sound source position measuring device 100 and measurement method, the data recording / analyzing device 9 includes a specific frequency component 11 of the sound source S1 and a ground improvement agent of a plurality of types of components recorded in advance. To compare and analyze the data of the frequency of the solid sound 11 generated on the contact surface between the ground improvement agent of a plurality of types having different components and the ground 2, and to determine the hardness and material component of the ground in contact with the ground improvement agent, The operator can determine whether or not it is in contact with the ground improvement body that has already been constructed, and can thereby manage the finished shape.

Further, in this underground sound source position measuring device 100 and measuring method, the data recording / analyzing device 9 is injected with the solid sound of the ground improvement agent that is always injected and moved in the ground 2 during the injection type ground improvement process. 11 is analyzed in real time, and the position of the moving ground improvement agent is sequentially identified, so that the operator sequentially checks the position of the moving ground improvement agent and copes with the individual sound 11 of the moving sound source S1. be able to.
[Embodiment 2 of the Invention]
Next, a second embodiment of the present invention will be described.

  FIG. 7 shows the second embodiment.

  As shown in FIG. 7, the underground sound source position measuring apparatus 100 and method according to the second embodiment specify the tip position of a boring machine 10 for excavating the ground.

  In addition, about the underground sound source position measuring apparatus 100 and its method according to the second embodiment, the same parts as the configuration and measuring method of the underground sound source position measuring apparatus 100 according to the first embodiment are omitted.

  Five sensors 7 of the underground sound source position measuring apparatus 100 are provided and arranged on the ground surface 3 in a planar array.

  In addition, the data recording / analyzing device 9 records a plurality of data of the frequency of the individual sound generated at the contact surface with the tip of the drilling rod of the boring machine 10 with respect to physical characteristics such as the hardness and material composition of the ground 2. Has been.

  Other configurations are the same as those of the first embodiment.

  Next, a method for measuring the underground sound source position in the second embodiment will be described, but the description overlapping with that in the first embodiment will be omitted.

  First, the operator activates the sensor 7, the amplifier 8, and the data recording / analysis device 9 of the underground sound source position measuring device 100. Next, the worker activates the boring machine 10 to excavate the ground by vibrating the tip of the excavating rod. In the second embodiment, boring is performed in the horizontal direction. However, in the case of boring in the vertical direction, since the drilling position of the boring is specified, the length h in the vertical direction from the ground surface is It is specified in advance.

  At this time, the tip of the excavation rod and the ground come into contact with each other by excavation, and an individual sound is generated from the individual sound generation position 5 which is the contact surface. The individual sound propagates through the individual sound propagation path 6 to reach the ground surface 3, and the sensor 7 detects the propagated individual sound and transmits a signal of individual sound information. The solid sound signal from the sensor 7 is amplified by the amplifier 8 and received by the data recording / analyzing device 9.

  The data recording / analyzing device 9 analyzes the frequency component and phase from the sound wave waveform of the received signal by a computer, and specifies the tip position of the drilling rod of the boring machine 100 in the same measurement procedure as in the first embodiment. To do. An operator looks at the position of the excavation rod of the boring machine 100 specified by the data recording / analysis device 9, the hardness of the ground 2 and the material component, and proceeds with the work process. Note that in the case of boring in the vertical direction, only the front and rear, left and right plane axis directions of the tip position of the excavation rod of the boring machine 100 may be specified.

  As described above, according to the measurement device 100 and the measurement method of the underground sound source position according to the second embodiment, the five sound field sound pressure type microphones that detect sound waves in a wide range of frequencies as the sensor 7 are in a planar array form. In order to detect the individual sound of the sound source generated at the individual sound generation position 5 which is the contact surface between the tip of the drilling rod of the boring machine 100 and the ground 2, Without installing an artificial sound source device, the individual sound of the sound source can be detected only by the sensor 7 on the ground surface 3, and the position of the ground improvement agent can be determined in three dimensions without the cost of the measurement device and the number of measurement steps. Can be identified.

  Moreover, in this underground sound source position measuring apparatus 100 and measuring method, the data recording / analyzing apparatus 9 generates various sounds in the ground 2 different from the individual sounds generated on the contact surface between the tip of the excavation rod and the ground 2. For filtering, it is possible to select and detect a specific frequency component of the sound source due to the contact between the tip of the excavation rod and the ground 2 without being hindered by noise in the ground 2, and to accurately identify the tip position of the excavation rod, The operator can confirm the tip position of the excavation rod more accurately.

  Further, in this underground sound source position measuring apparatus 100 and measuring method, the data recording / analyzing apparatus 9 A / D converts sound information detected by a plurality of sensors 7 and performs frequency analysis and phase analysis of the sound source with a computer. In order to perform analysis and identify the position of the ground improvement agent in the ground 2 in real time, the operator confirms the tip position of the excavation rod during the work process, confirms the progress of the process, reviews the process, etc. It becomes possible to deal with.

  Moreover, in this underground sound source position measuring apparatus 100 and measurement method, the solid sound generated by the contact between the tip of the excavation rod that constantly moves in the ground 2 and the ground 2 is analyzed in real time, and the moving excavation rod Since the tip position is sequentially specified, the operator can check the tip position of the moving excavating rod sequentially and cope with the individual sound of the moving sound source.

  It should be noted that each of the above embodiments is an exemplification of the present invention, and it is needless to say that the present invention is not limited to only each of the above embodiments.

  For example, six sensors 7 are arranged on the ground surface 3 in the first embodiment and five sensors 7 are arranged in the second embodiment, but any number of sensors 7 may be arranged as long as there are three or more. Further, when the vertical length is specified as in the case of boring, it is only necessary to have two or more sensors 7.

  In the first embodiment and the second embodiment, one amplifier 8 is provided between the plurality of sensors 7 and the data recording / analyzing device 9, but the signal of the individual sound transmitted from the sensor 7 is recorded / recorded. It is sufficient that the size is such that it can be received and analyzed by the analysis device 9, and there may be no amplifier 8, or one amplifier 8 may be connected to each sensor 7.

  Further, in the first embodiment, the data recording / analyzing device 9 specifies the position of the ground improvement agent of the sound source from the specific frequency component 11 of the sound source S1 by the computer. When it is necessary to detect the specific frequency component 11 of S1, as a measurement method of the underground sound source position, a difference is made in the time when the ground improving agent corresponding to each sound source S1 starts to be injected, and the time difference, sound source S1 It is conceivable to confirm that the time component on the horizontal axis of the waveform in the time domain is shifted and to specify the position of the ground improvement agent with respect to each sound source S1.

  Furthermore, in the first embodiment and the second embodiment, the data recording / analyzing device 9 may be provided with a monitor that displays the position of the identified ground improvement agent.

  In the first embodiment, the position of one ground improvement agent is specified, but the positions of two or three or more ground improvement agents may be specified.

  Furthermore, although the tip position of the excavation rod of one boring machine 10 is specified in Embodiment 2, the tip positions of the excavation rods of a plurality of boring machines 10 may be specified.

  Furthermore, in the first embodiment, the ground sound source position measuring device 100 is used for specifying the position of the ground improvement agent in the injection-type ground improvement process, and in the second embodiment for specifying the tip position of the drilling rod of the boring machine 10. However, if the sound source is in the ground, the position of other sound sources such as the position where water is flowing and the position where other machines are operating can be determined using this underground sound source position measuring device 100. It is possible to specify.

  The underground sound source position measuring apparatus 100 and the measuring method may be used in combination with a conventional underground sound source position measuring method in which a sensor is provided in the ground or an artificial sound source is provided at the tip of a drilling rod or the like. Is possible.

  In the above-described embodiment, the data recording / analyzing device is used as both the data recording means and the analyzing means. However, the present invention is not limited to this, and the data recording means and the analyzing means are different devices. It may be configured.

1 ... Construction machine 2 ... Ground 3 ... Ground surface 4 ... Improving agent injection position 5 ... Individual sound generation position (sound source position)
6 …… Sound propagation path 7 …… Sensor 8 …… Amplifier 9 …… Data recording / analysis device (data recording means, analysis means)
10 …… Boring machine 11 …… Specific frequency component of sound source S1 (solid sound)
100 …… Measurement device for underground sound source position S1 …… Sound source

Claims (4)

The individual sound generated at the sound source position in the ground is specified by the frequency component and recorded in the data recording means,
At least three sensors are disposed on the ground surface, and the sensor detects sound information including sound waves that propagate through the ground and reach the ground surface.
Filtering the sound information detected by the sensor with the data recording means to extract a specific frequency component and specifying the individual sound,
A measurement method of an underground sound source position, wherein the analysis means specifies the sound source position three-dimensionally based on a phase difference between the individual sounds specified by the sensors. The individual sound generated when the predetermined liquid hits the ground, which is generated at the sound source position in the ground, is identified by the frequency component and recorded in the data recording means,
The predetermined liquid is ejected in a substantially horizontal direction from an ejection unit provided at a position dug down a predetermined length in the vertical direction by boring,
At least two sensors are arranged on the ground surface, and the sensor detects sound information including sound waves that propagate through the ground and reach the ground surface.
Filtering the sound information detected by the sensor with the data recording means to extract a specific frequency component and specifying the individual sound,
The analysis means specifies the sound source position three-dimensionally based on the phase difference of the individual sound specified by each of the sensors and the vertical length of the ejection unit from the ground surface. Measuring method of the middle sound source position.   The method for measuring the position of an underground sound source according to claim 1 or 2, wherein the sensor is disposed in close contact with the ground or buried in the ground. A data recording means for recording individual sounds generated at sound source positions in the ground by frequency components;
A plurality of sensors that are arranged on the ground surface and detect sound information including sound waves that the solid sound propagates through the ground and reaches the ground surface;
Have
The sound information detected by the sensor is filtered by the data recording means to extract a specific frequency component to identify the individual sound,
An underground sound source position measuring apparatus comprising: an analysis unit that three-dimensionally identifies the sound source position based on the phase difference between the individual sounds specified by the sensors.

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