Concrete compaction management system and concrete compaction management method

Abstract

To provide a concrete compaction management system capable of determining a status of a vibrator without preparing a vibrator capable of sampling at a high frequency.SOLUTION: A concrete compaction management system managing a concrete compaction status by a vibrator comprises a vibration sensor, vibration characteristic calculation means, and status determination means. The vibration sensor can measure a frequency that is less than twice a frequency of the vibrator. The vibration characteristic calculation means calculates a pseudo frequency and a pseudo amplitude based on a pseudo wave form (a wave form in which aliasing is generated) obtained by the vibration sensor. The status determination means determines an operation status or a movement status based on the pseudo frequency and the pseudo amplitude.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to technology relating to concrete compaction, and more specifically, to a concrete compaction management system that can determine the status of compaction work based on information obtained from a vibration sensor. [Background technology]

[0002] A variety of structures are constructed from concrete, including the superstructure and substructure of bridges, tunnel linings, dam embankments, retaining walls, and office buildings. These concrete structures are generally constructed through the following process: Reinforcement bars are assembled and formwork is installed, concrete is then poured into the formwork, the concrete is then cured for a specified period of time, and once the concrete has sufficiently hardened, the formwork is removed and the concrete structure is completed.

[0003] Concrete can be poured into the formwork in a variety of ways, including pouring it through a chute from a truck mixer, pumping it with a concrete pump truck and discharging it from a hose, or in some cases, splashing it with a shovel by a worker. Concrete is made up of multiple materials such as cement, water, and aggregate, and there is a risk of material separation (particularly aggregate separation) occurring if it is simply poured into the formwork. Therefore, it is common to use a vibrator (e.g., a vibration vibrator) to mix (compact) the concrete poured into the formwork. In addition, since the concrete commonly used does not have self-fluidity, a vibrator is also used to distribute the concrete throughout the formwork.

[0004] For example, when compacting the concrete deck of a bridge, a vibrator is inserted at intervals of about 50 cm, with the vibration time at each location being about 10 to 15 seconds. If the concrete is not compacted sufficiently, the material may separate on the surface of the concrete (commonly known as junk) or there may be dents due to some areas not being filled in, and as a result, the completed concrete structure may not exhibit the strength expected from the design, and there is a risk of deformation or cracks occurring due to external forces.

[0005] Incidentally, conventional concrete compaction work is often left to the experience and intuition of the worker, so even if there are some places where compaction is insufficient, it is difficult to grasp it. For example, even if the worker thinks that he has applied vibration to the concrete with a vibration vibrator for about 10 seconds, it may actually be less than 10 seconds. It is possible for a manager to monitor and point out the problem, but since compaction work is usually performed by multiple workers, monitoring by a third party is not realistic.

[0006] Therefore, there has been a demand for a technology that enables a so-called quantitative judgment based on the results of measuring some phenomenon, rather than a so-called qualitative judgment based on the experience and intuition of the worker. In fact, various technologies related to this quantitative judgment have been proposed up to now. For example, Patent Document 1 proposes a technology that detects the vibration of a vibrator and uses the detection results to judge the completion of compaction of concrete. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2014-198933 A Summary of the Invention [Problem to be solved by the invention]

[0008] The technology disclosed in Patent Document 1 involves inserting a concrete compaction determination device having a three-axis accelerometer into concrete and determining the completion of concrete compaction based on the vibrations in the three axes of a vibration vibrator detected by the three-axis accelerometer. This technology makes it possible to quantitatively determine the completion of compaction without relying on the experience or intuition of the worker, but since the concrete compaction determination device is placed in a different position from the vibration vibrator, it does not necessarily determine the degree of compaction at the position of the vibration vibrator. Therefore, as with the conventional technology, it is difficult to grasp the fact that some areas are insufficiently compacted.

[0009] Incidentally, when compacting concrete, once a certain location has been sufficiently vibrated, the vibration vibrator is once removed, moved to the next location, and then reinserted into the concrete. In other words, during compaction work, the vibration vibrator is either in the concrete or in the air, and usually continues vibrating in either state. In other words, if it is possible to distinguish whether the vibration vibrator is in the concrete or in the air, it is possible to determine whether the concrete is being vibrated or not, and this makes it possible to determine the compaction state of the concrete at the position of the vibration vibrator.

[0010] In order to determine the state of the vibration vibrator (in concrete or in the air), it is possible to use the vibration of the vibration vibrator. That is, the vibration (signal) of the vibration vibrator is acquired using a vibration sensor (for example, an acceleration sensor), and the state of the vibration vibrator is determined by analyzing the vibration. Here, it is known that the waveform that can be generated (reproduced) based on the signal sampled by the vibration sensor is a waveform up to half the frequency (Nyquist frequency) of the sampling frequency. And, the frequency of a general vibration vibrator (for example, a high-frequency vibrator) is 200 to 250 Hz. That is, in order to generate the vibration waveform of the vibration vibrator, it is necessary to prepare a vibration sensor that can sample at a frequency more than twice that frequency (i.e., 400 to 500 Hz or more). However, a vibration sensor that can sample at such a high frequency is expensive, and above all, the number of samples is huge, so the time required for data processing increases, and a computer with high arithmetic processing power is required, which increases the calculation cost.

[0011] The object of the present invention is to solve the problems associated with the prior art, i.e., to provide a concrete compaction management system that can determine the status of a vibration vibrator without providing a vibration sensor capable of sampling at high frequencies. [Means for solving the problem]

[0012] The present invention was made with a focus on using a vibration sensor that samples at a relatively low frequency and actively utilizing the "pseudo waveform" resulting from aliasing obtained by this vibration sensor to determine the condition of the vibration vibrator (in concrete or in the air), and is an invention based on a previously unconventional idea.

[0013] The concrete compaction management system of the present invention is a system for managing the compaction status of concrete by a vibration vibrator, and is equipped with a vibration sensor, a vibration characteristic calculation means, and a status determination means. The vibration sensor has a measurable frequency less than twice the frequency of the vibration vibrator, and is attached to the vibration vibrator. The vibration characteristic calculation means is a means for performing a fast Fourier transform on a pseudo waveform (waveform in which aliasing occurs) obtained by the vibration sensor, and calculating a pseudo frequency and a pseudo amplitude of the pseudo waveform. The status determination means is a means for determining the status of the vibration vibrator by comparing the pseudo frequency with a predetermined frequency threshold value (or comparing the pseudo amplitude with a predetermined amplitude threshold value). The status determination means determines the status as an "operation status" in which the vibration vibrator is inside the concrete when the pseudo frequency is below the frequency threshold value (or the pseudo amplitude is below the amplitude threshold value), and determines the status as a "relocation status" in which the vibration vibrator is in the air when the pseudo frequency is above the frequency threshold value (or the pseudo amplitude is above the amplitude threshold value).

[0014] The concrete compaction management system of the present invention may be such that the vibration characteristic calculation means periodically calculates the pseudo frequency and the pseudo amplitude, and the status determination means periodically determines the status of the vibration vibrator. In this case, the status determination means determines the status as an operating status when the pseudo frequency is below the frequency threshold and the pseudo amplitude is below the amplitude threshold, and determines the status as a relocation status when the pseudo frequency is above the frequency threshold and the pseudo amplitude is above the amplitude threshold. Furthermore, the status determination means determines the status as an operating status when a determination that the pseudo frequency is below the frequency threshold and the pseudo amplitude is above the amplitude threshold is output a certain number of times (e.g., 3 or more times out of 5 times, or 2 times out of 2 times, etc.) out of a predetermined number of times, and determines the status as a relocation status when a determination that the pseudo frequency is above the frequency threshold and the pseudo amplitude is below the amplitude threshold is output a certain number of times out of a predetermined number of times.

[0015] The concrete compaction control system of the present invention can also determine whether the vibration vibrator has stopped. In this case, the situation determination means checks the pseudo frequency against a predetermined stop frequency threshold (or checks the pseudo amplitude against a predetermined stop amplitude threshold), and determines that the vibration vibrator has stopped when the pseudo frequency falls below the stop frequency threshold (or the pseudo amplitude falls below the stop amplitude threshold).

[0016] The concrete compaction management system of the present invention may further include a distance measuring means. This distance measuring means is capable of measuring distance and is attached to a worker (or the vibration vibrator) who operates the vibration vibrator above the vibration sensor. The distance measuring means measures a first distance to the concrete surface and a second distance to the vibration sensor. In this case, the situation determining means determines that the situation is in an operating state when the sum of a third distance (a distance from the vibration sensor to the vibration vibrator, which is grasped in advance) and the second distance is longer than the first distance and the determination based on the frequency threshold value or the pseudo amplitude is in an operating state, and determines that the situation is in a relocation state when the sum of the third distance and the second distance is shorter than the first distance and the determination based on the frequency threshold value or the pseudo amplitude is in a relocation state.

[0017] The concrete compaction management system of the present invention may further include a positioning means, a display means, and a completion determination means. The positioning means can measure the position of the vibration vibrator along with the time, the display means displays a work status diagram in which the planned range of the concrete is divided into small areas, and the completion determination means is a means for determining that the compaction work in the small areas is completed. The completion determination means calculates the residence time of the vibration vibrator in the small areas based on the position and time of the vibration vibrator measured by the positioning means, and determines that the compaction work in the small areas is completed when the determination of the operation status by the status determination means continues for a predetermined work time threshold during the residence time. The display means displays a work status diagram that distinguishes between a "completed small area" where the compaction work is determined to be completed and an "uncompleted small area" where the compaction work is not determined to be completed.

[0018] The concrete compaction management system of the present invention may be configured such that concrete compaction is performed by two or more vibration vibrators, and each vibration vibrator is equipped with the vibration sensor. In this case, the positioning means measures the position of each vibration vibrator, and the completion determination means determines the small area related to each vibration vibrator. Then, the display means displays a work status diagram that distinguishes between completed small areas and incomplete small areas determined based on the two or more vibration vibrators.

[0019] The concrete compaction management method of the present invention is a method for managing the compaction status of concrete by a vibration vibrator, and includes a measurement step, a vibration characteristic calculation step, and a status determination step. In the measurement step, the vibration signal of the vibration vibrator is measured by a vibration sensor provided in the concrete compaction management system of the present invention, and in the vibration characteristic calculation step, a fast Fourier transform is performed on the pseudo waveform to calculate the pseudo frequency and pseudo amplitude of the pseudo waveform. In the status determination step, the pseudo frequency is compared with a frequency threshold (or the pseudo amplitude is compared with an amplitude threshold) to determine the status of the vibration vibrator. In the status determination step, when the pseudo frequency is below the frequency threshold (or the pseudo amplitude is below the amplitude threshold), it is determined that the operating status is that the vibration vibrator is inside the concrete, and when the pseudo frequency is above the frequency threshold (or the pseudo amplitude is above the amplitude threshold), it is determined that the relocation status is that the vibration vibrator is in the air.

[0020] The concrete compaction management method of the present invention may further include a calibration step. In this calibration step, the vibration signal of the vibration vibrator vibrating in the air is measured by a vibration sensor, and a frequency threshold value and an amplitude threshold value are determined based on the measurement results. In the calibration step, the frequency threshold value and the amplitude threshold value are determined by statistically processing the pseudo frequency and pseudo amplitude obtained by the vibration sensor. Effect of the Invention

[0021] The concrete compaction management system and the concrete compaction management method of the present invention have the following effects. (1) The completion of compaction can be quantitatively determined without relying on the experience or intuition of the worker, meaning that compaction work can be entrusted to many workers, not just experienced workers. (2) Since there is no need to prepare a vibration sensor that samples at high frequencies, it can be procured at a relatively low cost. Moreover, since only an appropriate number of samples are processed, calculation costs can be reduced. Furthermore, calculations can be performed even with the low processing power of mobile devices such as smartphones. (3) The status (operating status / relocation status) of the vibration vibrator at its current location can be determined, and as a result, the manager can point out any areas where compaction is insufficient. In particular, by displaying a work status diagram on the display means, the occurrence of insufficient compaction can be prevented. [Brief description of the drawings]

[0022] [Figure 1] A graph showing the waveform generated by measuring an input signal at more than twice the Nyquist frequency and the actual waveform. [Diagram 2] A model diagram showing the relationship between the input frequency, pseudo frequency, and Nyquist frequency. [Diagram 3] A graph plotting coordinates consisting of input frequencies and pseudo frequencies obtained using the formula in the figure. [Figure 4] A graph plotting the input frequency and pseudo frequency of a vibration vibrator for each case of actual measurement and analytical reproduction. [Diagram 5] A graph plotting the frequency and amplitude obtained by measuring a vibration vibrator vibrating at a frequency of 220 Hz with a vibration sensor at a frequency of 50 Hz on a coordinate system. [Figure 6] FIG. 1 is a block diagram showing the main configuration of a concrete compaction management system according to the present invention. [Figure 7] FIG. 4 is a model diagram showing two types of distances measured by a distance measuring unit. [Figure 8] FIG. 4 is a model diagram that illustrates criteria by which a state determining means determines a vibrator state. [Figure 9] A model diagram that shows a schematic diagram of a work situation in which the concrete area for which compaction work is planned is divided into small areas. [Figure 10] 1 is a flow chart showing the main processing flow of the concrete compaction management system of the present invention. [Figure 11] 4 is a flowchart showing a main process flow in which a state determination means determines a vibrator state. FIG. [Figure 12] 4 is a flowchart showing a main process flow in which a state determination means determines a vibrator state. FIG. [Figure 13] 1 is a flow chart showing the flow of main steps of the concrete compaction management method of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An embodiment of the mobile protection device and concrete compaction management method of the present invention will be described with reference to the drawings.

[0024] 1.Definition Before describing the embodiment of the present invention, the following definitions of the terms used are provided. Note that the present invention is a technology related to the compaction of concrete, and the concrete referred to here means fresh (not yet hardened) concrete poured into a formwork, unless otherwise specified.

[0025] (Vibrator status) In the present invention, attention is paid to the fact that while concrete compaction work (hereinafter referred to as "compaction work") is being performed with a vibration vibrator (e.g., a high-frequency vibrator), the situation can be broadly divided into two situations: a worker inserts the vibration vibrator into the concrete, and a worker removes the vibration vibrator from the concrete and moves it in the air (i.e., relocates it) to move to the next compaction point. For convenience, the situation in which the vibration vibrator is inserted into the concrete will be referred to as the "operational state," the situation in which the vibration vibrator is moved in the air will be referred to as the "relocation state," and further, the operation state and relocation state will be collectively referred to as the "vibrator state."

[0026] (pseudo waveform) In the present invention, in order to determine the vibrator status, the vibration of the vibration vibrator is measured (i.e., sampled) by a vibration sensor such as an acceleration sensor. Meanwhile, the "sampling theorem" is known, which states that when measuring and generating (sampling) a target waveform, sampling must be performed at a frequency (i.e., resolution) twice or more the maximum frequency of the target waveform. As described above, the standard frequency of vibration waves caused by vibrations of a vibration vibrator such as a high-frequency vibrator (hereinafter, simply referred to as the "standard frequency of the vibration vibrator") is 200 to 250 Hz. That is, according to the sampling theorem, in order to generate (so to speak reproduce) the vibration waves of a vibration vibrator, a vibration sensor capable of sampling at a frequency twice or more (i.e., 400 to 500 Hz or more) must be prepared. However, a vibration sensor capable of sampling at such a high frequency is expensive, and above all, the number of samples is huge, which increases the time required for data processing, and further requires a computer with high arithmetic processing capacity, which increases the calculation cost. Therefore, in the present invention, a vibration sensor that samples at a frequency less than twice the standard frequency of the vibration vibrator (including frequencies less than the standard frequency of the vibration vibrator) is used, and the sampling theorem is not followed. For convenience, the vibration sensor that samples at a frequency less than twice the standard frequency of the vibration vibrator (including frequencies less than the standard frequency of the vibration vibrator) is specifically referred to as a "low-frequency vibration sensor" herein.

[0027] It is known that when the sampling theorem is not followed, such as when the vibration of a vibration vibrator is measured by a low-frequency vibration sensor, the generated waveform has a phenomenon called "aliasing". Figure 1 is a graph showing a waveform generated by sampling at a frequency less than twice the frequency of the target waveform (input signal), in other words, measuring an input signal at twice the Nyquist frequency (half the sampling frequency), and the actual waveform (input signal). As shown in this figure, when a waveform (input signal) at a frequency twice the Nyquist frequency or more is measured, aliasing occurs in the waveform generated based on the result, and a waveform with a long wavelength (long period) and a lower frequency (frequency) than the actual waveform (input signal) is generated. For convenience, a waveform with aliasing will be referred to as a "pseudo waveform", the frequency of the pseudo waveform will be referred to as a "pseudo frequency", and the amplitude of the pseudo waveform will be referred to as a "pseudo amplitude". In conventional vibration measurement, non-existent "pseudo waveforms" are considered harmful because they lead to incorrect understanding of events, and measures such as "anti-aliasing filters" have even been taken to prevent the occurrence of pseudo waveforms. In contrast, the present invention proactively accepts aliasing and makes effective use of "pseudo waveforms," ​​and in this respect, it can be said that the invention has a different technical concept from conventional technology.

[0028] In an aliased waveform, the input frequency F in and the pseudo-frequency F d is known to be symmetrical with respect to the Nyquist frequency (1 / 2 the sampling frequency Fs), and as shown in Equation 1 in this figure, the pseudo frequency F d is the sampling frequency Fs and the input frequency F in However, this formula 1 holds true only if the sampling frequency Fs is greater than the input frequency F in On the other hand, the sampling frequency Fs is limited to the input frequency F in For the case where the sampling frequency Fs is smaller than the input frequency F in There are no examples showing a relationship between

[0029] The sampling frequency Fs is the input frequency F in In the case where the sampling frequency Fs is larger than the input frequency F in to pseudo frequency F d In other words, the sampling frequency Fs and the pseudo frequency F d When the input frequency F in However, if the sampling frequency Fs is smaller than the input frequency F in In the case where the pseudo frequency F d and sampling frequency Fs, input frequency F in Since the relationship between the sampling frequency Fs and the pseudo frequency F d Even if the input frequency F in There are no examples of this estimation.

[0030] Therefore, the inventors of the present invention have conducted extensive research and have found that the sampling frequency Fs is equal to the input frequency F in It was found that even in cases where the frequency is smaller than , the formula 2 shown in Figure 3 holds. An integer n that satisfies the conditions of the formula shown in formula 2 is searched for, and the detected integer n, the sampling frequency Fs, and the input frequency F in The pseudo frequency F d In Figure 3, the input frequency F obtained using Eq. in and the pseudo-frequency F d The horizontal axis is the input frequency F in , the vertical axis is the pseudo frequency F d In this figure, the results are plotted on a coordinate system of 3 sampling frequencies Fs (50 Hz, 70 Hz, 100 Hz). in The values ​​of the sampling frequency Fs are shown as examples for the case where the sampling frequency Fs is 130 Hz. As can be seen from this figure, Equation 2 also corresponds to Equation 1 in Figure 2, that is, Equation 2 is the sampling frequency Fs and the input frequency F in It can be used regardless of size.

[0031] As explained so far, the sampling frequency Fs is equal to the input frequency F in Even if the sampling frequency Fs is greater than the input frequency F in Even in cases where the pseudo-frequency F d and the input frequency F in There is a considerable causal relationship between the vibration and the vibration of the vibrator. In other words, by using the frequency (i.e., pseudo frequency) obtained by measuring the vibration of the vibrator using a low-frequency vibration sensor, it is also possible to determine the operating status (relocation status and vibrator status) based on the change in frequency of the vibrator.

[0032] Therefore, the inventor of the present invention conducted an experiment using a low-frequency vibration sensor to measure the vibration waves of a vibration vibrator in a relocated state and a vibration vibrator in an operating state. Specifically, a low-frequency vibration sensor with a frequency (sampling frequency Fs) of 50 Hz was used to measure the vibration waves of a vibration vibrator in a relocated state and a vibration vibrator in an operating state. in The vibration vibrator with an input frequency F of 200 to 250 Hz was measured in an air environment (i.e., relocation state) and in a concrete environment (i.e., operating state). in and the pseudo-frequency F d This is a graph plotting the actual measured values ​​and the values ​​reproduced by analysis. As can be seen from Figure 4, the measured values ​​and the reproduced values ​​in both the relocation and operation conditions roughly match the theoretical linearity, but the distributions are clearly different between the relocation and operation conditions. Therefore, the pseudo frequency F d The inventors have also confirmed that it is possible to determine the operating status of the vibration vibrator based on the pseudo amplitude.

[0033] To obtain the pseudo frequency and pseudo amplitude from a sample (signal) obtained using a low-frequency vibration sensor, the following analysis procedure can be exemplified. First, a fast Fourier transform (FFT) is performed on the results of measuring the vibration of the vibration vibrator using the low-frequency vibration sensor. Then, the waveform that gives the largest amplitude (peak amplitude) among the waveforms divided into each frequency component is taken as the pseudo waveform, and the frequency related to this pseudo waveform is taken as the pseudo frequency, and the amplitude (i.e., peak amplitude) is taken as the pseudo amplitude. For example, in FIG. 5, a frequency of 220 Hz (input frequency F in 5 shows the results of measuring a vibration vibrator that vibrates at a frequency of 0.05 Hz (sampling frequency Fs) using a low-frequency vibration sensor with a frequency of 50 Hz (sampling frequency Fs). Specifically, the coordinates consisting of the response values ​​(amplitudes) for each frequency obtained by FFT processing of the measurement results are plotted in a coordinate system with frequency on the horizontal axis and amplitude on the vertical axis. In FIG. 5, the peak amplitude is 193.87, that is, this peak amplitude is the pseudo amplitude, the frequency corresponding to this is the pseudo frequency (generally a value called the dominant frequency or natural frequency), and the waveform related to these is the pseudo waveform.

[0034] 2.Concrete Compaction Management System Next, the concrete compaction management system of the present invention will be described. Fig. 6 is a block diagram showing the main components of the concrete compaction management system 100 of the present invention. As shown in this figure, the concrete compaction management system 100 of the present invention is configured to include a low-frequency vibration sensor 112, vibration characteristic calculation means 121, and situation determination means 122, and can also be configured to include a vibration vibrator 111 (e.g., a high-frequency vibrator), distance measurement means 113, work-side display means 114, completion determination means 123, management-side display means 124, positioning means 130, etc.

[0035] As shown in this figure, the vibration vibrator 111, low-frequency vibration sensor 112, distance measuring means 113, and work-side display means 114 are placed on the side of the worker performing the compaction work, while the vibration characteristic calculation means 121, status determination means 122, completion determination means 123, and management-side display means 124 can be placed in a place (such as a management office) different from the place where the compaction work is performed (hereinafter referred to as the "construction site"). In that case, however, it is necessary to install communication means (including wireless and wired) between the worker at the construction site and the management office that can transmit and receive various information (such as vibration sensor signals and vibrator status) handled by the concrete compaction management system. Of course, the vibration characteristic calculation means 121 to the management-side display means 124 can also be placed at the construction site where the compaction work is performed, or some of the means can be placed at the construction site, for example, by having the person supervising the construction (hereinafter simply referred to as the "supervisor") carry the management-side display means 124. In addition, in this figure, three workers, Worker A, Worker B, and Worker C, are performing compaction work at a construction site, and each worker is assigned a vibration vibrator 111 to a work-side display means 114, but of course the compaction work can be performed by a single worker (for example, only Worker A) and the vibration vibrator 111 to a work-side display means 114 can be assigned to that worker, or the compaction work can be performed by two or four or more workers and the vibration vibrator 111 to a work-side display means 114 can be assigned to each worker.

[0036] The vibration characteristic calculation means 121, the situation determination means 122, and the completion determination means 123 that constitute the concrete compaction management system 100 can be manufactured as dedicated devices, or a general-purpose computer device can be used. This computer device includes a processor such as a CPU, storage and memory such as ROM and RAM, and may further include input means such as a mouse and keyboard, and a display. Examples of the computer device include a tablet computer (iPad (registered trademark), etc.) and a mobile terminal device such as a smartphone, or a personal computer (PC), a server, etc.

[0037] Below, each of the main elements that make up the concrete compaction management system 100 will be described in detail.

[0038] (Low frequency vibration sensor) As described above, the low-frequency vibration sensor 112 is a vibration sensor that samples at a frequency less than twice the standard frequency of the vibration vibrator (including frequencies less than the standard frequency of the vibration vibrator), and for example, an acceleration sensor can be used, and is attached to the vibration vibrator 111. If the low-frequency vibration sensor 112 is also installed on a metal part of the vibration vibrator 111, the amplitude becomes extremely large, and there is a possibility of a problem in detecting vibration such as range over. Therefore, it is preferable to install the low-frequency vibration sensor 112 on a relatively soft part (for example, a part made of rubber) of the vibration vibrator 111, and it is also preferable to install the low-frequency vibration sensor 112 at a position a certain distance (for example, about 500 mm) away from the tip of the vibration vibrator 111. The result of the low-frequency vibration sensor 112 measuring (i.e., sampling) the vibration of the vibration vibrator (hereinafter referred to as "vibration sensor signal") is continuously (or periodically or intermittently) passed to the vibration characteristic calculation means 121.

[0039] (distance measuring means) The distance measuring means 113 is a means capable of measuring distance, and in addition to a distance measuring device using a laser, a distance measuring device using sound waves or radio waves, a distance measuring device using photogrammetry technology, etc., can be used. A tablet computer or a smartphone equipped with these devices can be used. The distance measuring means 113 is attached to the worker or the vibration vibrator 111 at a position above the low-frequency vibration sensor 112 as shown in FIG. 7. The distance measuring means 113 measures at least two types of distances as shown in FIG. 7. Specifically, the distance measuring means 113 measures the distance from the distance measuring means 113 to the concrete surface (hereinafter referred to as the "first distance L1") and the distance from the distance measuring means 113 to the low-frequency vibration sensor 112 (hereinafter referred to as the "second distance L2"). It is preferable to measure in advance the distance from the low-frequency vibration sensor 112 to the tip of the vibration vibrator 111 (hereinafter referred to as the "third distance L3") and the dimensions (especially the length) of the low-frequency vibration sensor 112. The distance measuring means 113 continuously (or periodically or intermittently) measures the first distance L1 and the second distance L2, and the measured first distance L1 and second distance L2 are passed to the vibration characteristic calculation means 121 continuously (or periodically or intermittently).

[0040] (Vibration characteristic calculation means) The vibration characteristic calculation means 121 is a means for determining a pseudo frequency and a pseudo amplitude related to a pseudo waveform based on a vibration sensor signal received from the low-frequency vibration sensor 112, for example, by an analysis procedure such as that described with reference to FIG.

[0041] (Situation determination means) The status determination means 122 is a means for determining the vibrator status (operation status, relocation status) of the vibration vibrator 111 based on the pseudo frequency and pseudo amplitude calculated by the vibration characteristic calculation means 121. Hereinafter, a procedure for the status determination means 122 to determine the vibrator status will be described.

[0042] First, the pseudo frequency is compared with a predetermined number threshold (hereinafter referred to as the "frequency threshold"), and the pseudo amplitude is compared with a predetermined threshold (hereinafter referred to as the "amplitude threshold"). When the pseudo frequency is below the frequency threshold and the pseudo amplitude is below the amplitude threshold, it is determined to be in an "operational state", and when the pseudo frequency is above the frequency threshold and the pseudo amplitude is above the amplitude threshold, it is determined to be in a "relocation state". Alternatively, the vibrator state can be determined based on either the pseudo frequency or the pseudo amplitude. For example, the pseudo frequency can be compared with a predetermined frequency threshold, and when the pseudo frequency is below the frequency threshold, it can be determined to be in an "operational state", and when the pseudo frequency is above the frequency threshold, it can be determined to be in a "relocation state". Also, the pseudo amplitude can be compared with a predetermined amplitude threshold, and when the pseudo amplitude is below the amplitude threshold, it can be determined to be in an "operational state", and when the pseudo amplitude is above the amplitude threshold, it can be determined to be in a "relocation state".

[0043] The status determination means 122 can also determine the vibrator status according to a diagram showing the criteria shown in Fig. 8 (hereinafter referred to as a "criterion area diagram"). In this diagram, various reference values ​​are shown in a coordinate system with the horizontal axis representing the pseudo frequency and the vertical axis representing the pseudo amplitude. That is, with regard to the pseudo frequency, the maximum pseudo frequency F Max and the boundary pseudo-frequency F Lim , stopping pseudofrequency F Stop As for the pseudo amplitude, the maximum pseudo amplitude A Max and the boundary pseudo-amplitude A, which is also the amplitude threshold. Lim , stop pseudo amplitude A Stop Then, the pseudo-frequency is the boundary pseudo-frequency F Lim When the pseudo amplitude falls below the boundary pseudo amplitude A Lim The region where the pseudo frequency is below the boundary pseudo frequency F Lim and the pseudo amplitude falls below the maximum pseudo amplitude A Max ~boundary pseudo amplitude A Lim The region where the pseudo frequency is the maximum pseudo frequency F Max ~Boundary pseudo frequency F Lim and the pseudo amplitude is the boundary pseudo amplitude ALim (hereinafter referred to as the "provisional relocation area"), the pseudo frequency is below the maximum pseudo frequency F Max ~Boundary pseudo frequency F Lim and the pseudo amplitude is the maximum pseudo amplitude A Max ~boundary pseudo amplitude A Lim The area is divided into four areas: the area where the pseudo frequency is stopped (hereinafter referred to as the "relocation area"); Stop The pseudo amplitude stops when the pseudo amplitude falls below A Stop (hereinafter referred to as the "stop region") (however, in this case, the stop region is excluded from the operating region.

[0044] The pseudo-frequency F that determines the operating status, temporary operating status, temporary relocation status, relocation status, and stop status shown in Fig. 8 Max and boundary pseudo frequency F Lim , stopping pseudofrequency F Stop , maximum pseudo amplitude A Max , boundary pseudo amplitude A Lim , stop pseudo amplitude A Stop can be set by a test measurement carried out in advance. That is, the vibration vibrator 111 vibrating in the air is measured by the low-frequency vibration sensor 112 for a certain period (for example, 5 seconds), and various reference values ​​are set by statistical processing of the pseudo frequencies and pseudo amplitudes obtained as a result (for example, 5 times). For example, the pseudo frequency F Max is set to 1 / 2 of the sampling frequency of the low-frequency vibration sensor 112, and the boundary pseudo frequency F Lim is the average value of the pseudo frequency obtained in the test measurement (or the average value minus n times the standard deviation), and the stop pseudo frequency F Stop is the boundary pseudo-frequency F Lim The pseudo amplitude A can be set to a value obtained by subtracting a predetermined value (including 0) from the pseudo amplitude A. Max is the maximum amplitude observed by the low-frequency vibration sensor 112, and the boundary pseudo amplitude A Lim is the average value of the pseudo amplitude obtained in the test measurement (or the average value minus n times the standard deviation), and the stop pseudo amplitude A Stop is the amplitude of acceleration, 1G (9.8m / s 2 ) can be used.

[0045] Furthermore, the status determination means 122 can also determine the vibrator status based on the first distance L1 and the second distance L2. The determination procedure will be described below. First, the status determination means 122 obtains the sum of the second distance L2 received from the distance measurement means 113 and the known third distance L3, that is, obtains the distance from the distance measurement means 113 to the tip of the vibration vibrator 111 (hereinafter referred to as the "fourth distance L4") as shown in FIG. 7. Next, this fourth distance L4 is compared with the first distance L1, and is also compared with the status determined by the status determination means 122 based on the pseudo frequency and pseudo amplitude (hereinafter referred to as the "primary determination status"). That is, when the status determination means 122 determines the "operation status" as the primary determination status, and the fourth distance L4 is longer than the first distance L1, the status is determined to be the "operation status". On the other hand, when the situation determination means 122 determines the primary determination situation to be a "relocation situation" and the fourth distance L4 is shorter than the first distance L1, it determines the situation to be a "relocation situation." In addition, when the situation determination means 122 determines the primary determination situation to be an "operation situation" and the fourth distance L4 is shorter than the first distance L1, it determines the situation to be a "provisional operation situation," and when the situation determination means 122 determines the primary determination situation to be a "relocation situation" and the fourth distance L4 is longer than the first distance L1, it can also determine the situation to be a "provisional relocation situation."

[0046] (Positioning means) The positioning means 130 is a means for positioning the position of the vibration vibrator 111. The positioning means 130 may employ, for example, a satellite positioning system (GNSS: Global Navigation Satellite System), laser measurement, a positioning method using a wireless LAN access point, a positioning method using ultra-wideband wireless communication (UWB: Ultra Wide Band), a self-position estimation technology using SLAM (Simultaneous Location and Mapping), a positioning technology using SfM (Structure from Motion), or measurement using a total station. The positioning means 130 continuously (or periodically or intermittently) measures the position of the vibration vibrator 111 and also acquires the positioning time, and the measured position information of the vibration vibrator 111 and the positioning time are continuously (or periodically or intermittently) passed to the completion determination means 123.

[0047] (Means for determining completion) The completion determination means 123 is a means for determining the state of the compaction work (hereinafter simply referred to as the "work state") based on the position information of the vibration vibrator 111 received from the positioning means 130 and the positioning time, and specifically classifies the state into a state where the compaction work has been sufficiently performed (hereinafter referred to as the "completed state") and a state where the compaction work has not been sufficiently performed (hereinafter referred to as the "incomplete state"). FIG. 9 is a model diagram that shows a plan view (hereinafter referred to as the "work situation view") in which the concrete range for which the compaction work is planned is divided into small areas MS. This plan view is displayed on the work side display means 114 (FIG. 6) arranged on the worker side, the management side display means 124 (FIG. 6) carried by the supervisor at the construction site, or the management side display means 124 (FIG. 6) arranged in the management office or the like. The work side display means 114 can use a display of a tablet computer, a smartphone, or the like, and the management side display means 124 can also use a display of a tablet computer, a smartphone, or a PC, or the like. In the work status diagram shown in Figure 9, there are two small areas MS in an incomplete state surrounded by completed states, and it is easy to imagine that these are areas that have not been compacted. In other words, by using the work status diagram, it is possible to avoid missed compactions, which is advantageous.

[0048] The procedure for the completion determination means 123 to determine the work state is described below. First, the stay time of the vibration vibrator 111 is calculated based on the position information and positioning time of the vibration vibrator 111 received from the positioning means 130. This stay time is the time that the vibration vibrator 111 is placed in the same small area MS, and when the previously received position information and the currently received position information are approximately the same (within the same small area MS), it is calculated by accumulating the difference between the previously received positioning time and the currently received positioning time to the stay time up to that point. In other words, when the previously received position information and the currently received position information do not match (not in the same small area MS), the stay time accumulated up to that point is canceled (returned to 0). However, when the completion determination means 123 determines that the stay time has continued for a predetermined threshold (hereinafter referred to as the "work time threshold"), the stay time at that time is maintained.

[0049] When the stay time exceeds the work time threshold as described above, the completion judgment means 123 judges the work state at that location to be a "completed state" and designates that area MS as a "completed small area." Also, when the vibration vibrator 111 is in that area MS but the stay time has not yet exceeded the work time threshold, the completion judgment means 123 judges the work state at that location to be a "work in progress state" and designates that area MS as a "working small area," and designates an area MS that the vibration vibrator 111 has not yet visited as an "uncompleted small area." Then, the completion judgment means 123 displays a work situation diagram so that the completed small area, the working state, and the uncompleted small area are each distinguished from each other along with the position of the vibration vibrator 111, as shown in FIG. 9. In FIG. 9, concrete is compacted by three vibration vibrators 111, and each vibration vibrator 111 is installed and the work status is judged for the area MS corresponding to each vibration vibrator 111. Of course, the compaction work can be performed by one worker and the work status can be judged for the area MS related to that worker, or the compaction work can be performed by two or four or more workers and the work status can be judged for the area MS related to each worker.

[0050] (Processing flow) Next, the flow of main processes when using the concrete compaction control system 100 of the present invention will be described with reference to Fig. 10. Fig. 10 is a flow diagram showing the flow of main processes in the concrete compaction control system 100. In this flow diagram, the central column shows the processes to be performed, the left column shows input information required for the processes, and the right column shows output information resulting from the processes.

[0051] When the worker starts compaction work, the low-frequency vibration sensor 112 acquires a vibration sensor signal (Step 210 in FIG. 10). Then, the vibration characteristic calculation means 121 receives the vibration sensor signal and performs FFT based on the vibration sensor signal (Step 220 in FIG. 10), while calculating a pseudo frequency and a pseudo amplitude (pseudo wave characteristic value) (Step 230 in FIG. 10). Once the pseudo frequency and pseudo amplitude are calculated, the status determination means 122 determines the vibrator status (Step 240 in FIG. 10). The process by which the status determination means 122 determines the vibrator status will be described in detail below with reference to FIG. 11.

[0052] First, before starting the actual compaction work (so-called main construction), a test measurement is performed in advance (Step 201 in FIG. 11). That is, the vibration vibrator 111 vibrating in the air is measured for a certain period (for example, 5 seconds) by the low-frequency vibration sensor 112. Then, based on the vibration sensor signal obtained in the test, an amplitude threshold value (for example, boundary pseudo amplitude A Lim ) and a frequency threshold (e.g., the boundary pseudo-frequency F Lim ) (Step 203 in FIG. 11), or by performing the statistical processing described above (Step 202 in FIG. 11), the maximum pseudo frequency F Max and the boundary pseudo-frequency F Lim , stopping pseudofrequency F Stop , maximum pseudo amplitude A Max , boundary pseudo amplitude A Lim , stop pseudo amplitude A Stop (Step 203 in FIG. 11), and also set the reference region diagram shown in FIG.

[0053] When the reference area map (or the frequency threshold and the amplitude threshold) is set and the pseudo frequency and the pseudo amplitude are calculated, the situation determination means 122 checks the combination of the pseudo frequency and the pseudo amplitude against the reference area map (Step 241 in FIG. 11) and determines the primary determination situation (Step 242 in FIG. 11). If the primary determination situation by the situation determination means 122 is "operation situation" or "relocation situation", the primary determination situation is confirmed (Yes in Step 243 in FIG. 11). If the distance measured by the distance measurement means 113 is used (Yes in Step 248 in FIG. 11), the process proceeds to checking the fourth distance L4 and the first distance L1 by the distance measurement means 113 (Step 247 in FIG. 11). On the other hand, if the distance measured by the distance measurement means 113 is not used (No in Step 248 in FIG. 11), the process proceeds to the situation determination process by the situation determination means 122 (Step 245 in FIG. 11).

[0054] On the other hand, if the primary judgment status by the status judgment means 122 is a "provisional operating status" or a "provisional relocation status", the primary judgment status is not confirmed (No in Step 243 of Figure 11), and the status judgment means 122 repeatedly judges the primary judgment status. Then, when the situation determination means 122 determines that the "provisional operation status" or the "provisional relocation status" is determined a predetermined number of times or more (for example, two or more times) in succession (Yes in Step 244 of Figure 11), the primary determination status is set to the "operation status (when the provisional operation status continues)" or the "relocation status (when the provisional relocation status continues)", and if the distance measured by the distance measurement means 113 is to be used (Yes in Step 248 of Figure 11), the process proceeds to comparing the fourth distance L4 and the first distance L1 by the distance measurement means 113 (Step 247 of Figure 11), and if the distance measured by the distance measurement means 113 is not to be used (No in Step 248 of Figure 11), the process proceeds to the situation determination process by the situation determination means 122 (Step 245 of Figure 11). On the other hand, when the "provisional operating status" or "provisional relocation status" is not judged consecutively more than the required number of times (No in Step 244 in FIG. 11), the primary judgment status is reserved (Step 246 in FIG. 11) and the status judgment means 122 continues to judge the primary judgment status. Note that, not only when the "provisional operating status" or "provisional relocation status" is judged consecutively more than the required number of times, but also when the "provisional operating status" or "provisional relocation status" is judged a certain number of times (for example, 3 out of 5 times, or 3 out of 3 times) out of the most recent specified number of times, the primary judgment status can be confirmed and the process can proceed to the next process (Step 248 in FIG. 11).

[0055] When the "operation status" or "relocation status" is determined, the status determination means 122 compares the fourth distance L4 measured by the distance measurement means 113 with the first distance L1. Then, when the primary determination status is the "operation status" and the fourth distance L4 is longer than the first distance L1 (Yes in Step 247 in FIG. 11), the status is determined to be the "operation status" (Step 245 in FIG. 11). When the primary determination status is the "relocation status" and the fourth distance L4 is shorter than the first distance L1 (Yes in Step 247 in FIG. 11), the status is determined to be the "relocation status" (Step 245 in FIG. 11). Note that the process of comparing the fourth distance L4 with the first distance L1 (Step 247 in FIG. 11) may be omitted, in which case the primary determination status (operation status, relocation status) determined by the status determination means 122 is determined as is (Step 245 in FIG. 11).

[0056] When the vibrator status (operation status, relocation status) is determined, the completion determination means 123 determines the work status in that small area MS (Step 260 in FIG. 10). Hereinafter, the process in which the status determination means 122 determines the vibrator status will be described in detail with reference to FIG.

[0057] First, the positioning means 130 acquires the position information and the positioning time of the vibration vibrator 111 (Step 251 in FIG. 12). Then, the completion determination means 123, which has received the position information and the positioning time, compares the previously received position information with the currently received position information, and if they substantially match (Yes in Step 252 in FIG. 12), calculates the stay time (Step 253 in FIG. 12). On the other hand, if they do not substantially match (No in Step 252 in FIG. 12), the small area MS is temporarily designated as an "uncompleted small area" (Step 257 in FIG. 12), and continues to acquire the position information and the positioning time (Step 251), and compares successive pieces of position information with each other (Step 252).

[0058] When the stay time is calculated, the completion determination means 123 compares the stay time with the work time threshold (e.g., 10 seconds) (Step 254 in FIG. 12). If the stay time exceeds the work time threshold (continues) (Yes in Step 254 in FIG. 12), the small area MS is determined to be a "completed small area." On the other hand, if the stay time is below the work time threshold (does not continue) (No in Step 254 in FIG. 12), the small area MS is temporarily determined to be a "working small area" (Step 256 in FIG. 12), and the processing of Steps 251 to 254 is continued.

[0059] When the completion determination means 123 determines that the small area MS is a "completed small area," the display of the small area MS is changed to that for a completed small area as shown in Fig. 9 (Step 260 in Fig. 10), and the worker confirms the display change and then moves the vibration vibrator 111 to the next work location (small area MS) (Step 270 in Fig. 10). Then, a series of processes from the measurement process of the vibration sensor (Step 210 in Fig. 10) to the movement of the vibration vibrator 111 (Step 270 in Fig. 10) are repeatedly executed until all small areas MS are determined to be "completed small areas."

[0060] 3. Concrete compaction management method Next, the concrete compaction management method of the present invention will be described with reference to Fig. 13. The concrete compaction management method of the present invention is a method of performing compaction work using the concrete compaction management system 100 described so far. Therefore, we will avoid any explanation that overlaps with the contents explained about the concrete compaction management system 100, and will only explain the contents unique to the concrete compaction management method of the present invention. In other words, the contents not described here are the same as those explained in "2. Concrete Compaction Management System", including "1. Definitions".

[0061] Fig. 13 is a flow diagram showing the flow of the main steps of the concrete compaction management method of the present invention. As shown in this figure, first, a calibration step (Step 301 in Fig. 13) is carried out before starting the actual compaction work (so-called main construction). That is, the vibration vibrator 111 vibrating in the air is measured by the low-frequency vibration sensor 112 for a certain period (for example, 5 seconds). Then, based on the vibration sensor signal obtained in the test, an amplitude threshold value (for example, boundary pseudo amplitude A Lim ) and a frequency threshold (e.g., the boundary pseudo-frequency F Lim ) or by performing the statistical processing described above, the maximum pseudo frequency F Max and the boundary pseudo-frequency F Lim , stopping pseudofrequency F Stop , maximum pseudo amplitude A Max , boundary pseudo amplitude A Lim , stop pseudo amplitude A Stop and set the reference region diagram shown in Figure 8.

[0062] Next, one or more workers carry out compaction work as the main construction (Step 302 in FIG. 13). At the same time, the low-frequency vibration sensor 112 acquires a vibration sensor signal related to the vibration of the vibration vibrator 111 (Step 303 in FIG. 13), and the vibration characteristic calculation means 121 that has received the vibration sensor signal calculates a pseudo frequency and a pseudo amplitude (pseudo wave characteristic value) based on the vibration sensor signal (Step 304 in FIG. 13). When the pseudo wave characteristic value is calculated, the status determination means 122 determines the vibrator status (Step 305 in FIG. 13), and if the determination is "operation status", the completion determination means 123 determines the work status in the small area MS (Step 306 in FIG. 13). Then, when the completion determination means 123 determines that the small area MS is a "completed small area," the display of that small area MS in the reference area diagram (FIG. 9) is changed to that for a completed small area, and the worker confirms the display change and then moves the vibration vibrator 111 to the next work location (small area MS) (Step 307 in FIG. 13). Then, a series of steps from the compaction work (Step 302 in FIG. 13) to the relocation of the vibration vibrator 111 (Step 307 in FIG. 13) are repeated until all the small areas MS are determined to be "completed small areas." [Industrial Applicability]

[0063] The concrete compaction management system and method of the present invention can be used for various concrete structures such as bridge superstructures and substructures, tunnel linings, dam embankments, retaining walls, office buildings, etc. Considering that the present invention provides high-quality concrete structures and thus provides high-quality social capital (infrastructure), it can be said that the invention is not only applicable to industry but also has the potential to make a significant contribution to society. [Explanation of symbols]

[0064] 100 Concrete compaction management system of the present invention 111 Vibrating Vibrator 112 Low Frequency Vibration Sensor 113 Distance measurement means 114 Work side display means 121 Vibration characteristic calculation means 122 Situation Judgment Method 123 Completion Judgment Means 124 Management side display means 130 Positioning methods L1 1st distance L2 2nd distance L3 3rd distance L4 4th distance MS small area

Claims

1. A system for managing the compaction status of concrete using a vibration vibrator, a vibration sensor attached to the vibration vibrator and having a measurable frequency less than twice the frequency of the vibration vibrator; a vibration characteristic calculation means for performing a fast Fourier transform on a pseudo waveform in which aliasing occurs, the pseudo waveform being obtained by the vibration sensor, and calculating a pseudo frequency and a pseudo amplitude of the pseudo waveform; and a status determination means for determining a status of the vibration vibrator by comparing the pseudo frequency with a predetermined frequency threshold and / or comparing the pseudo amplitude with a predetermined amplitude threshold, The situation determination means determines that the vibration vibrator is in an operating situation in which it is located inside concrete when the pseudo frequency is below the frequency threshold value and / or the pseudo amplitude is below the amplitude threshold value, and determines that the vibration vibrator is in a relocation situation in which it is located in air when the pseudo frequency is above the frequency threshold value and / or the pseudo amplitude is above the amplitude threshold value. A concrete compaction management system characterized by the above.

2. the vibration characteristic calculation means periodically calculates the pseudo frequency and the pseudo amplitude, and the status determination means periodically determines a status of the vibration vibrator; the state determination means determines that the state is the operating state when the pseudo frequency is below the frequency threshold and the pseudo amplitude is below the amplitude threshold, and determines that the state is the relocation state when the pseudo frequency is above the frequency threshold and the pseudo amplitude is above the amplitude threshold; Furthermore, the situation determination means determines that the operating situation is present when a determination that the pseudo frequency is below the frequency threshold and the pseudo amplitude is above the amplitude threshold is output a certain number of times among a predetermined number of times, and determines that the relocation situation is present when a determination that the pseudo frequency is above the frequency threshold and the pseudo amplitude is below the amplitude threshold is output a certain number of times among a predetermined number of times.

2. The concrete compaction management system according to claim 1.

3. The situation determination means compares the pseudo frequency with a predetermined stop frequency threshold and / or compares the pseudo amplitude with a predetermined stop amplitude threshold, Furthermore, the situation determination means determines that the vibration vibrator has stopped when the pseudo frequency falls below the stop frequency threshold and / or the pseudo amplitude falls below the stop amplitude threshold.

3. The concrete compaction management system according to claim 1 or 2.

4. a distance measuring means that is attached to an operator who operates the vibration vibrator or to the vibration vibrator above the vibration sensor and that can measure a distance; The distance measuring means measures a first distance to a concrete surface and a second distance to the vibration sensor, the status determination means determines that the operating status is present when a sum of a third distance from the vibration sensor to the vibration vibrator and the second distance is longer than the first distance and a determination based on the frequency threshold value and / or the pseudo amplitude is present that the operating status is present; Furthermore, the situation determination means determines that the situation is the relocation situation when the sum of the third distance and the second distance is shorter than the first distance and the determination based on the frequency threshold value and / or the pseudo amplitude is the relocation situation.

4. The concrete compaction management system according to claim 1, wherein the concrete compaction management system is a system for controlling a concrete compaction process.

5. a positioning means for measuring the position of the vibration vibrator together with time; a display means for displaying a work status diagram in which a planned area of ​​concrete is divided into small areas; and a completion determination means for determining that the compaction work in the small area is completed. The completion determination means calculates the residence time of the vibration vibrator in the small area based on the position and time of the vibration vibrator measured by the positioning means, and determines that the compaction work in the small area is completed when the determination of the operating status by the status determination means continues for a predetermined work time threshold during the residence time, The display means displays the work status diagram in which a completed small area where compaction work has been determined to be completed is distinguished from an incomplete small area where compaction work has not been determined to be completed.

5. A concrete compaction management system according to claim 1, wherein the concrete compaction management system is a system for controlling a concrete compaction process.

6. The concrete is compacted by two or more of the vibration vibrators, and the vibration sensor is attached to each of the vibration vibrators; The positioning means measures the position of each of the vibration vibrators, The completion determination means performs a determination for each of the small areas related to each of the vibration vibrators, The display means displays the work status diagram in which the completed small area and the incomplete small area determined based on two or more of the vibration vibrators are distinguished.

6. The concrete compaction management system according to claim 5.

7. A method for managing the compaction status of concrete using a vibration vibrator, comprising the steps of: a measuring step of measuring the vibration of the vibration vibrator by a vibration sensor attached to the vibration vibrator and having a measurable frequency less than twice the frequency of the vibration vibrator; a vibration characteristic calculation step of performing a fast Fourier transform on a pseudo waveform in which aliasing occurs, the pseudo waveform being obtained by the vibration sensor, and calculating a pseudo frequency and a pseudo amplitude of the pseudo waveform; A status determination step of checking the pseudo frequency against a predetermined frequency threshold and / or checking the pseudo amplitude against a predetermined amplitude threshold to determine the status of the vibration vibrator, In the state determination step, when the pseudo frequency is below the frequency threshold value and / or the pseudo amplitude is below the amplitude threshold value, the state is determined to be an operating state in which the vibration vibrator is inside concrete, and when the pseudo frequency is above the frequency threshold value and / or the pseudo amplitude is above the amplitude threshold value, the state is determined to be a relocation state in which the vibration vibrator is in air. A method for managing concrete compaction.

8. The method further includes a calibration step of measuring the vibration of the vibration vibrator vibrating in air by the vibration sensor and determining the frequency threshold value and / or the amplitude threshold value, In the calibration step, the frequency threshold value and / or the amplitude threshold value are determined by statistically processing the pseudo frequency and / or the pseudo amplitude obtained by the vibration sensor.

8. The method for controlling concrete compaction according to claim 7.

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