Vibration measurement system and vibration measurement method

Abstract

To provide a system and a method which allow a user to grasp whether or not the vibration that causes a problem for residents near a place through which an excavator passes is the vibration caused by excavation by the excavator.SOLUTION: A vibration measurement system comprises: an underground measurement instrument 30 which is attached to an excavator 10 that excavates underground to measure the vibration of the excavator 10; a ground measurement instrument 31 which is arranged on a ground surface 20 through which the excavator 10 passes to measure the vibration of the ground surface 11; and an information processing device 32 which determines whether or not the vibration recognized on the ground surface 20 is the vibration due to the excavation by the excavator 10 on the basis of the measurement result of the underground measurement instrument 30 and the measurement result of the ground measurement instrument 31.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a system and method for measuring vibration.

Background Art

[0002] When a tunneling machine applied in the shield method or a tunneling machine applied in the propulsion method tunnels underground, large vibrations may occur when the rotating cutter in front of the tunneling machine bites into large rocks, or when friction occurs between the tunneling machine and the earth and sand on the side, resulting in large vibrations due to the friction.

[0003] Such large vibrations are propagated to the ground and can cause complaints, for example, by shaking buildings, furniture, etc., or by propagating indoors as structure - borne sound due to the generation of high - frequency vibrations.

[0004] For the purpose of suppressing the occurrence of complaints caused by characteristic vibrations, a technique is known for identifying the presence or absence of characteristic vibrations estimated to affect the ground from the data measured by vibration sensors installed inside a tunneling machine (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the above - ground area through which the tunneling machine passes, there are many vibrations and noises such as vehicle traffic on trunk roads other than the construction by the tunneling machine. In the conventional technique described in Patent Document 1 above, since it only identifies the presence or absence of characteristic vibrations estimated to affect the ground, there is a problem that it is impossible to grasp whether the vibrations that are a problem for the residents near where the tunneling machine passes are caused by the tunneling by the tunneling machine.

Means for Solving the Problems

[0007] The present invention has been made in view of the above problems, and comprises a first measuring means that is attached to a tunneling machine that excavates underground and measures the vibration of the tunneling machine, A second measuring means is positioned on the ground surface through which the tunnel boring machine passes and measures vibrations of the ground surface, An information processing means that determines whether the vibrations recognized on the ground surface are caused by excavation by a tunnel boring machine, based on the first measurement result of the first measurement means and the second measurement result of the second measurement means. A vibration measurement system is provided, which includes [the following]. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a system and method that can determine whether vibrations that are problematic for residents near the passage of an excavation machine are caused by the excavation by the machine. [Brief explanation of the drawing]

[0009] [Figure 1] A diagram showing an example configuration of a vibration measurement system. [Figure 2] A diagram showing an example configuration of measuring instruments attached to an excavation machine. [Figure 3] A diagram showing an example configuration of measuring instruments placed on the ground surface. [Figure 4] A diagram showing an example configuration of an information processing system installed in a control room. [Figure 5] A flowchart showing the process for measuring vibrations. [Figure 6] This figure shows the time history and frequency characteristics for 52 seconds, 5 minutes after the start of measurement. [Figure 7] This figure shows the time history and frequency characteristics for a 52-second period 83 minutes after the start of measurement. [Figure 8] This figure shows the time history and frequency characteristics after low-pass filtering. [Modes for carrying out the invention]

[0010] Figure 1 shows an example of the configuration of the vibration measurement system according to this embodiment. The vibration measurement system measures vibrations at the tunneling machine 10 as it drills underground and at the ground surface, and from the measurement results, it is possible to determine whether vibrations that are problematic for residents near where the tunneling machine 10 passes are caused by the tunneling by the tunneling machine 10.

[0011] The tunnel boring machine 10 is a shield machine used in the shield tunneling method or a tunnel jacking machine used in the pipe jacking method. Figure 1 shows an example in which a shield machine is used as the tunnel boring machine 10. A shield machine is an excavation machine that has a cutter head 11 at the tip of a cylindrical shield, and moves forward while cutting away soil and bedrock with the cutter head 11, and assembles divided blocks called segments 12 at the rear of the shield using erectors 13, and constructs the outer shell at the same time as excavating the tunnel. The shield tunneling method is a tunnel excavation method that uses a shield machine.

[0012] The pipe jacking method involves excavating vertical shafts of a predetermined depth on both the starting and receiving ends, excavating a tunnel-like opening from the starting shaft to the receiving shaft, and then burying the pipeline without open excavation by passing the pipe through this opening. The pipe jacking machine is an excavation machine that burys the pipeline while excavating a tunnel-like opening by rotating a faceplate equipped with a cutter, connecting the pipe jacking pipe, and pushing the pipe jacking pipe forward with a hydraulic jack.

[0013] When the cutter at the front of the tunnel boring machine 10 rotates, the cutter may catch on large rocks, potentially generating significant vibrations. Additionally, when the sides of the tunnel boring machine 10 move forward, friction with the surrounding soil and other materials can cause significant vibrations. These large vibrations are then transmitted to the ground surface 20 via the surrounding soil and other materials. The ground surface 20 contains buildings such as houses, and furniture and other items are installed inside these buildings. The vibrations transmitted to the ground surface 20 can cause the buildings and furniture to shake.

[0014] Furthermore, vibrations that propagate to the ground surface 20 are transmitted through the building's foundation and other structures, causing the walls and other structures to vibrate and radiate into the air as sound (structure-borne sound).

[0015] Vibrations of furniture and the like and sounds radiated indoors can become a cause of complaints for residents in the vicinity where the tunneling machine 10 passes underground as vibrations and noises associated with the tunneling of the tunneling machine 10.

[0016] Regarding vibrations and noises associated with the tunneling of the tunneling machine 10, for example, by installing a machine for measuring vibrations and noises on the ground surface 20 through which the tunneling machine 10 passes and determining whether the threshold value is exceeded, it is possible to determine whether the vibrations and noises that may cause complaints from neighboring residents are present.

[0017] However, on the ground surface 20, in addition to the construction work by the tunneling machine 10 underground, there are many vibrations and noises other than construction work such as vehicle traffic on the main road. It is difficult for neighboring residents to distinguish whether the vibrations and noises they feel are due to construction work, due to non-construction factors, or due to both. Then, it is also possible that neighboring residents may assume that all are due to the influence of construction work and be forced into a situation where the construction work has to be interrupted.

[0018] Therefore, it is desirable to be able to determine whether the vibrations and noises on the ground surface 20 are due to the construction work by the tunneling machine 10, and it is desirable to proceed with the construction work while leaving the judged result as a record so that it can be submitted as evidence at any time.

[0019] To achieve this, the vibration measurement system is configured to include a subterranean measuring instrument 30, a ground measuring instrument 31, and an information processing device 32. The subterranean measuring instrument 30 is attached to the tunneling machine 10 and measures the vibrations of the tunneling machine 10. The ground measuring instrument 31 is disposed on the ground surface 20 through which the tunneling machine 10 passes and measures the vibrations of the ground surface 20. The information processing device 32 determines whether the vibrations recognized on the ground surface 20 are vibrations caused by the tunneling of the tunneling machine 10 based on the first measurement result of the subterranean measuring instrument 30 and the second measurement result of the ground measuring instrument 31.

[0020] The information processing device 32 determines whether the vibration at the object to be protected is of a problematic magnitude based on the second measurement result measured at the ground surface 20. The ground measuring instrument 31 may be equipped with only one measuring means for measuring vibrations at the ground surface 20, or it may be equipped with two or more measuring means. For example, if it is equipped with two measuring means, one may be a measuring means that can measure vibrations independently of human perception and measure solid-borne sound, etc., and the other may be a measuring means that can measure vibrations at a level that can be perceived by humans. A measuring means that can measure vibrations at a level that can be perceived by humans can measure vibrations caused by pollution (pollution vibrations) and vibrations in the work environment, etc. In a ground measuring instrument 31 equipped with such two measuring means, it is possible to determine whether the vibration is of a problematic magnitude by using the measurement result of either one of the two means and determining whether the value indicated by the measurement result is above a threshold.

[0021] The ground measuring instrument 31 may be configured to have one measuring means, but will be described below as having two measuring means. The two measuring means of the ground measuring instrument 31 will be described as follows: the measurement result obtained by the measuring means capable of measuring vibrations independently of human perception and measuring structure-borne sound etc. as vibrations will be referred to as the second measurement result; and the measurement result obtained by the measuring means capable of measuring vibrations at a level perceptible to humans will be referred to as the third measurement result. Alternatively, the measurement result obtained by the former measuring means capable of measuring structure-borne sound may be referred to as the third measurement result, and the measurement result obtained by the latter measuring means capable of measuring vibrations at a level perceptible to humans may be referred to as the second measurement result.

[0022] The information processing device 32 can determine from the second and third measurement results measured by the ground measuring instrument 31 at the ground surface 20 whether normal vibrations between 1 Hz and less than 100 Hz are dominant, or whether structure-borne sound above 100 Hz is the problem. By simultaneously measuring the vibrations of the ground surface 20 with the two measurement means of the ground measuring instrument 31, it is possible to separate and understand in real time vibrations that are recognized as pollution vibrations and vibrations that may be recognized as sound.

[0023] Furthermore, if the information processing device 32 determines that the vibration at the site to be protected is of a problematic magnitude, it uses the first measurement result and the second or third measurement result, or both, to determine whether the characteristics of the change in the magnitude of vibration at the ground surface 20 are linked to the characteristics of the change in the magnitude of vibration at the tunneling machine 10. This makes it possible to determine whether the vibrations recognized on the ground are caused by the tunneling by the tunneling machine 10.

[0024] The underground measuring instrument 30 can be attached to a bulkhead 14 or the like near the tip of the tunnel boring machine 10 if the tunnel boring machine 10 is a shield machine. The bulkhead 14 is located behind the cutter head 11, which is located at the front, and together with the cutter head 11, it forms a space called a chamber 15 for filling with excavated soil and other materials. A screw conveyor 16 is installed so as to pass through the bulkhead 14, and the soil and other materials filled in the chamber 15 are sent to the rear and transported out of the tunnel using a truck or the like. The mounting location of the underground measuring instrument 30 is not limited to the bulkhead 14, but can be attached to any location as long as it can measure the vibrations of the tunnel boring machine 10 during excavation.

[0025] The two measuring means of the ground measuring instrument 31 are installed on a hard, flat surface that can appropriately measure vibrations of the ground surface 20 through which the tunnel boring machine 10 passes, such as a road, curb, mounting platform, or firmly compacted ground.

[0026] The second and third measurement results measured by the ground measuring instrument 31 are sent to and stored in cloud storage 33. The cloud storage 33 is located on the internet 34, and an NTP (Network Time Protocol) server 35 exists on the internet 34. The NTP server 35 is a server that distributes current time information in order to synchronize the time information of all devices on the internet 34. The NTP server 35 distributes current time information to the information processing device 32 and the ground measuring instrument 31. The ground measuring instrument 31 adds the time information obtained from the NTP server 35 to the measured second and third measurement results and sends them to storage 33 for storage.

[0027] The underground measuring instrument 30 is controlled by the information processing device 32. The first measurement result measured by the underground measuring instrument 30 is sent to the information processing device 32, which adds time information obtained from the NTP server 35, stores it in the memory unit of the information processing device 32, and displays it in real time. The information processing device 32 also obtains the second and third measurement results from the storage 33 and displays them in real time along with the first measurement result. Then, using these measurement results, it is determined whether the vibrations recognized at the ground surface 20 are due to vibrations from the tunneling machine 10.

[0028] Figure 2 shows an example configuration of the underground measuring instrument 30. The underground measuring instrument 30 includes three-axis accelerometers 40 and 41, a data recording device 42, and a connection I / F 43 that connects the three-axis accelerometers 40 and 41 to the data recording device 42, receives measurement results measured by the three-axis accelerometers 40 and 41, and outputs them to the data recording device 42. The data recording device 42 is housed in a dustproof box to protect it from dust generated by the excavation of the tunnel boring machine 10. Only one three-axis accelerometer 40 or 41 may be installed, or two may be installed as shown in the example in Figure 2. In addition, three or more three-axis accelerometers 40 or 41 may be installed on the tunnel boring machine 10.

[0029] When two 3-axis accelerometers 40 and 41 are provided, one can be mounted on the partition wall 14 and the other on the cylindrical side wall, which is the skin plate. Note that these mounting positions are examples only and the system is not limited to these positions.

[0030] The tunnel boring machine 10 experiences significant vibrations due to knocking, which occurs when friction with the soil on the sides is released. Measuring the vibration of the tunnel boring machine body in only one axis does not allow us to understand the effect of this knocking. This is because the dominant direction of vibration changes depending on the cause of the vibration, and unless vibrations in all directions are understood, it is not possible to determine the effect of the vibration of the tunnel boring machine body on the vibration of the ground surface 20. For this reason, three-axis accelerometers 40 and 41 capable of measuring in three axes (x, y, and z directions) are used.

[0031] The measurement results received from the 3-axis accelerometers 40 and 41 are analog signals indicating acceleration, which are converted into digital signals by the connection interface 43 and then output to the data recording device 42.

[0032] The data recording device 42 records digital signals as acceleration data. The data recording device 42 is connected to an optical cable via a relay device such as a hub or a Media Converter (MC) that converts signals between different media and enables communication. The optical cable connects to an information processing device 32, such as a Personal Computer (PC), installed in the control room. The data recording device 42 can record acceleration data on its own and also transmit it to the information processing device 32 via the optical cable. Note that the connection between the data recording device 42 and the information processing device 32 is not limited to an optical cable; they may be connected by other cables or wirelessly.

[0033] Figure 3 shows an example of the functional configuration of an information processing device 32 installed in the control room. The information processing device 32 is connected to a data recording device 42 via relay devices such as MCs and hubs. The information processing device 32 includes a control unit 50 that controls the data recording device 42 and instructs the data recording device 42 to measure acceleration using three-axis accelerometers 40 and 41. The information processing device 32 includes a calculation unit 51 that calculates composite acceleration based on the acceleration (three axes) measured by the three-axis accelerometers 40 and 41, a generation unit 52 that generates acceleration data by adding the date and time to the calculated composite acceleration, a display unit 53 that displays the generated acceleration data as a graph, an alarm output unit 54 that instructs the output of an alarm using a Patlite (registered trademark) as a warning light, a storage unit 55 that stores data, and a data transmission unit 56 that saves past data to storage 33 on the cloud. Patlite® functions as a notification means that, in response to instructions from the alarm output unit 54 of the information processing device 32, notifies that the vibration value of the ground surface 20 is above a threshold and is therefore a problematic vibration. Therefore, it is not limited to Patlite® as long as it can notify that the vibration is a problematic vibration.

[0034] The information processing device 32 includes a CPU, ROM, RAM, HDD, communication interface, input / output interface, etc., as hardware, and implements a program on the HDD to execute the above-mentioned processing. Therefore, the information processing device 32 generates each of the above-mentioned functional units and realizes each function when the CPU reads the program stored on the HDD into RAM and executes it. Here, we have explained how each function is realized by a program, but this is not the only way, and some or all of the functions may be realized in hardware using electronic circuits, etc.

[0035] The information processing device 32 includes a data receiving unit 57, which receives the second and third measurement results from the ground measuring instrument 31 as measurement data. The data receiving unit 57 can receive the measurement data via storage 33 on the cloud.

[0036] Figure 4 shows an example configuration of the ground measuring instrument 31. The ground measuring instrument 31 includes two sensors: a 3-axis accelerometer 60 and a 3-way pickup 61 and a vibration level meter 62. The 3-axis accelerometer 60 is connected to a data recording device 64 via a connection I / F 63. The vibration level meter 62 and the data recording device 64 are connected to a vibration level measurement PC 65, and the acceleration data as the second measurement result recorded in the data recording device 64 and the vibration level data as the third measurement result measured by the vibration level meter 62 are transmitted to the cloud storage 33 and stored, along with time information obtained from the NTP server 35.

[0037] The vibration level measurement PC 65 can also save acceleration data and vibration level data, along with time information, to its own device. The vibration level measurement PC 65 is connected to a mobile router 66 as a relay device in order to connect to the internet 34.

[0038] The vibration level measurement PC 65 instructs the vibration level meter 62 and the data recording device 64 to measure acceleration and vibration level. The three-way pickup 61 is installed on the ground surface 20 and is a device that detects vibration levels in three directions and converts them into analog electrical signals. The vibration level meter 62 receives analog electrical signals from the three-way pickup 61, converts them into digital signals, and generates vibration level data. The vibration level meter 62 is configured to allow the insertion and removal of a recording medium such as a memory card, and can record vibration level data on the recording medium.

[0039] The information processing device 32 shown in Figure 3 can overlay acceleration data and vibration level data acquired from the underground measuring instrument 30 and the surface measuring instrument 31, and display them in real time on the display unit 53. This makes it possible to determine whether the vibration at the area to be protected is of a problematic magnitude, and to determine whether the characteristics of the change in the magnitude of vibration at the ground surface 20 are linked to the characteristics of the change in the magnitude of vibration at the tunneling machine 10. Furthermore, it is possible to determine whether normal vibration is dominant or whether structure-borne noise is the problem.

[0040] Figure 5 is a flowchart showing the process flow for measuring vibrations using a vibration measurement system. The underground measuring instrument 30 is attached to the tunneling machine 10, and the above-ground measuring instrument 31 is placed at a predetermined position on the ground surface 20, and the process starts from step 100. In step 101, the information processing device 32 instructs the underground measuring instrument 30 to measure the three-axis acceleration, and the vibration level measurement PC 65 instructs the vibration level meter 62 to measure the vibration level and the data recording device 64 to measure the three-axis acceleration, thereby starting the measurement of acceleration and vibration level.

[0041] Measurements can be performed periodically, for example, at 1-second intervals. However, the measurement interval is not limited to 1-second intervals and can be any interval. The time interval can also be changed by setting. The underground measuring instrument 30 and the above-ground measuring instrument 31 add time information obtained from the NTP server 35 to the measured acceleration and vibration levels to generate acceleration data and vibration level data.

[0042] The information processing device 32 acquires acceleration data measured by the underground measuring instrument 30, and acceleration data and vibration level data measured by the above-ground measuring instrument 31. The information processing device 32 then displays each of the acquired data in real time.

[0043] In step 102, the information processing device 32 determines whether the vibration at the maintenance target is of a problematic magnitude based on the acceleration data and vibration level data measured by the ground measuring instrument 31. The information processing device 32 can determine that the vibration is of a problematic magnitude if it uses either the acceleration data or the vibration level data, for example, the vibration level data, and the vibration level data exceeds 55 dB. Note that this is just an example, and the determination may also be made using acceleration data, or a value other than 55 dB may be used as the threshold.

[0044] If it is determined in step 102 that the vibration is not of a problematic magnitude, the process proceeds to step 109 to determine whether to continue operating the tunneling machine 10. If it is determined to continue, the process returns to step 102; if it is determined not to continue, the process proceeds to step 110 to end the measurement. The decision not to continue operation includes temporarily stopping the tunneling by the tunneling machine 10, or interrupting the tunneling due to an abnormality.

[0045] If, in step 102, it is determined that the vibration is of a problematic magnitude, the process proceeds to step 103, where the information processing device 32 instructs the Patlite® to light up to notify that the vibration is of a problematic magnitude. Then, the process proceeds to step 104, where, based on the acceleration data and vibration level data measured by the ground measuring instrument 31, the vibration characteristics are determined to determine whether normal vibration is dominant or whether structure-borne sound is the problem.

[0046] The vibration level data represents normal vibrations and consists of data below 100 Hz. On the other hand, the acceleration data includes data above 100 Hz, such as vibrations recognized as structure-borne sound. Therefore, it is possible to determine whether the problem is normal vibration or structure-borne sound based on whether the dominant frequency is below 100 Hz or above 100 Hz. If the problem is normal vibration, proceed to step 105; if the problem is structure-borne sound, proceed to step 106.

[0047] In step 107, the information processing device 32 determines whether the characteristics of the change in the magnitude of vibration of the ground surface 20 are linked to the characteristics of the change in the magnitude of vibration of the tunnel boring machine 10.

[0048] For example, if the magnitude of vibration of the tunneling machine 10 increases or decreases over time, and the magnitude of vibration of the ground surface 20 also increases or decreases at a similar rate over time, it can be determined that the characteristics of the changes in vibration magnitude are linked. Similarly, if the peak vibration of the tunneling machine 10 and the peak vibration of the ground surface 20 appear in the same way with a certain delay time difference, it can also be determined that the characteristics of the changes in vibration magnitude are linked. However, if the magnitude of vibration of the tunneling machine 10 increases over time, but the magnitude of vibration of the ground surface 20 remains almost constant, it can be determined that the characteristics of the changes in vibration magnitude are not linked.

[0049] If it is determined in step 107 that the system is not working together, it is determined that the vibration in question is likely caused by vibrations other than those from the construction work by the tunneling machine 10, and therefore it is not necessary to operate the tunneling machine 10 in low-vibration mode. The system then proceeds to step 109 to decide whether to continue operating the tunneling machine 10.

[0050] If it is determined in step 107 that the vibrations are linked, it is determined that the tunnel boring machine 10 is the cause and therefore needs to be operated with reduced vibration. Accordingly, the process proceeds to step 108 and the tunnel boring machine 10 is operated with reduced vibration. The tunnel boring machine 10 can be operated with reduced vibration by changing the boring conditions, such as reducing the boring speed of the tunnel boring machine 10, changing the cutter rotation speed, or doing both. After operating the tunnel boring machine 10 with reduced vibration, the process proceeds to step 109 and a decision is made on whether to continue operating the tunnel boring machine 10.

[0051] Here, we are only determining whether the characteristics of the change in the magnitude of vibration at the ground surface 20 are linked to the change in the magnitude of vibration measured by the tunnel boring machine 10. However, it is also possible to determine whether or not the tunnel boring machine 10 has experienced knocking based on the presence or absence of knocking characteristics, where vibration in only one direction is dominant.

[0052] The vibration measuring means used in the underground measuring instrument 30 and the above-ground measuring instrument 31 are not limited to a three-axis accelerometer, but may be a speedometer or the like, as long as they can measure vibration.

[0053] Furthermore, by recording each data point within the vibration measurement system based on time information, construction can proceed while leaving behind evidence that allows for the determination of whether the ground surface vibration is caused by the excavation machine 10 or by other factors unrelated to the construction.

[0054] Here, we present the results of an investigation into whether knocking vibrations can actually be detected by attaching a 3-axis acceleration sensor (AMA-A-5, manufactured by Kyowa Dengyo Co., Ltd., measurable frequency range: DC~500Hz) near the bulkhead of the shield machine, which serves as the tunneling machine 10, and measuring the vibrations near the bulkhead.

[0055] The measurement was conducted over approximately 90 minutes, but since it is difficult to display the entire time history, Figures 6 and 7 show the time history and frequency characteristics for 52 seconds, 5 minutes and 83 minutes after the start of the measurement. Figure 6 shows the vibration characteristics 5 minutes after the start of the measurement, and Figure 6(a) shows the elapsed time (sec) and acceleration in each axial direction (m / s²). 2 Figure 6(b) is a time history graph showing the relationship between frequency (Hz) and acceleration in each axis direction (m / s²). 2 This is a graph of the frequency characteristics showing the relationship with (). Figure 7 shows the vibration characteristics 83 minutes after the start of measurement, and Figure 7(a) shows the elapsed time (sec) and acceleration in each axial direction (m / s²). 2 Figure 7(b) is a time history graph showing the relationship between frequency (Hz) and acceleration in each axis direction (m / s²). 2 This is a graph of the frequency characteristics showing the relationship with (). The x-axis direction is the direction in which the tunneling machine 10 drills, the y-axis direction is a horizontal direction that is approximately parallel to the ground surface 20 and perpendicular to the direction in which the tunneling machine 10 drills, and the z-axis direction is a vertical direction that is approximately perpendicular to the ground surface 20.

[0056] Referring to Figures 6(b) and 7(b), vibrations near the bulkhead during shield machine excavation are predominant around 300 Hz. Therefore, it can be estimated that vibrations around 300 Hz are mechanical vibrations of the shield machine. Referring to Figure 7(b), a dominant frequency is also observed in the low-frequency band around 10 Hz in the x-axis (excavation direction).

[0057] To confirm this effect, the data was converted to the frequency domain using a Fourier transform to remove the dominant frequency characteristic around 300 Hz, eliminating the influence of high-frequency components above 200 Hz, and then converted back to time history using a low-pass filter. The result of the low-pass filter is shown in Figure 8. Figure 8(a) shows the elapsed time (sec) and acceleration in each axis direction (m / s²). 2 Figure 8(b) is a time history graph showing the relationship between frequency (Hz) and acceleration in each axis direction (m / s²). 2 This is a graph showing the frequency response in relation to ).

[0058] Referring to Figure 8(a), the amplitude of the acceleration in the x-axis is larger than the amplitudes of the accelerations in the y-axis and z-axis. Also, referring to Figure 8(b), although the maximum acceleration value is small, the x-axis around 10Hz is prominently displayed. This phenomenon in which only the x-axis acceleration is dominant indicates that vibration is occurring only in the drilling direction, and the frequency characteristics shown in Figure 8(b) were confirmed to be the frequency characteristics due to the occurrence of knocking vibration.

[0059] As explained above, this system and method allow for construction work to be carried out while continuously measuring the vibrations of the tunneling machine 10 and the ground surface 20, thereby determining the impact of the construction work and other factors. Therefore, if it is determined that the impact is due to the construction work, a system can be established to promptly implement countermeasures such as reducing the tunneling speed.

[0060] Furthermore, since the condition of the ground surface can be constantly monitored by the ground measuring instrument 31, it is possible to explain to the construction client and the residents whose property is to be protected that the vibrations perceived at the ground surface 20 are not due to the construction, or that they are due to the construction but have been reduced to a level that does not pose a problem through countermeasures, based on the records of the construction status regarding vibrations.

[0061] The vibration measurement system and vibration measurement method of the present invention have been described in detail with reference to the embodiments shown in the drawings. However, the present invention is not limited to the embodiments described above, and can be modified to include other embodiments, additions, changes, or deletions within the scope that a person skilled in the art can conceive. In any embodiment, as long as the operation and effects of the present invention are achieved, it is included within the scope of the present invention. Therefore, it can be applied to machines other than tunneling machines, as long as they generate vibrations underground. [Explanation of Symbols]

[0062] 10…Drilling machine 11…Cutter head 12... Segments 13… Erecta 14...Bulkhead 15… Chamber 16... Screw conveyor 20...ground surface 30…Underground measuring instruments 31... Ground measuring instruments 32…Information Processing Devices 33…Storage 34…Internet 35…NTP server 40, 41…3-axis accelerometer 42...Data recording device 43…Connection I / F 50…Control Unit 51...Arithmetic section 52...Generation section 53...Display section 54… Alarm output section 55...Storage section 56...Data transmission unit 57...Data receiving unit 60…3-axis accelerometer 61...3-way pickup 62…Vibration level meter 63…Connection I / F 64...Data recording device 65…Vibration level measurement PC 66... ​​Mobile router

Claims

1. A first measuring means is attached to a tunneling machine that excavates underground and measures the vibration of the tunneling machine, A second measuring means is installed on the ground surface through which the tunneling machine passes and measures vibrations of the ground surface, An information processing means that determines whether the vibrations recognized on the ground surface are vibrations caused by the excavation by the excavation machine, based on the first measurement result of the first measurement means and the second measurement result of the second measurement means. A vibration measurement system, including...

2. The measurement means includes a third measuring means installed on the ground surface and capable of measuring vibrations in a predetermined frequency range, The vibration measurement system according to claim 1, wherein the information processing means determines whether the value of the ground surface vibration is above a threshold using the measurement result of the second measurement means or the measurement result of the third measurement means or both.

3. The vibration measurement system according to claim 2, wherein the information processing means uses the measurement results of the second measurement means and the measurement results of the third measurement means to determine whether the vibration is recognized as pollution vibration or whether the vibration may be recognized as sound.

4. The vibration measurement system according to claim 2, further comprising a notification means for notifying that the vibration value of the ground surface is greater than or equal to a threshold in response to an instruction from the information processing means.

5. The vibration measurement system according to claim 1, wherein the first measuring means and the second measuring means are three-axis accelerometers.

6. A vibration measurement method performed by a vibration measurement system comprising a first measuring means attached to a tunnel boring machine that drills through the ground, a second measuring means installed on the ground surface through which the tunnel boring machine passes, and an information processing means, The first step is to measure the vibration of the tunneling machine using the first measuring means, The steps include measuring the ground surface vibration using the second measuring means, The information processing means determines, based on the first measurement result of the first measurement means and the second measurement result of the second measurement means, whether or not the vibrations recognized on the ground surface are vibrations caused by the excavation by the excavation machine. A vibration measurement method, including the following.

7. The vibration measurement system includes a third measuring means installed on the ground surface and capable of measuring vibrations in a predetermined frequency range. The vibration measurement method according to claim 6, further comprising the step of determining whether the vibration value of the ground surface is equal to or greater than a threshold value using the measurement result of the second measurement means or the measurement result of the third measurement means or both, by means of the information processing means.

8. The vibration measurement method according to claim 7, further comprising the step of using the information processing means to determine whether the vibration is recognized as pollution vibration or vibration that may be recognized as sound, using the measurement results of the second measurement means and the measurement results of the third measurement means.

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