JP2019168389A - Crack angle determination device and crack angle determination method - Google Patents

Abstract

To provide a crack angle determination device and a crack angle determination method each enabling crack angles to be easily determined.SOLUTION: A crack angle determination device 4 evaluates a crack angle θ formed between a crack C in a depth direction, of an object M and a surface Mof the object M. A crack depth calculation unit 14 calculates a crack depth at each striking position on the basis of oscillation generated when striking the surface Mof the object M on the crack C at a plurality of striking positions. The crack depth calculation unit 14 calculates a crack depth on the basis of a spectrum peak of natural frequency of oscillation generated when striking at a plurality of striking positions. A crack angle calculation unit 18 calculates the crack angle θ on the basis of the calculation result of the crack depth calculation unit 14.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crack angle determination device and a crack angle determination method for determining the angle of a crack formed by a crack in the depth direction of an object and the surface of the object.

  As a technique for recognizing cracks on the concrete surface, a method by taking an image has been developed. A conventional crack detection device calculates a saturation from RGB values for each pixel of an image photographed by a light irradiating means for irradiating a concrete structure with light, a photographing means for photographing the concrete structure, and the photographing means. Saturation calculation means and crack determination means for determining the presence or absence of cracks on the surface of the concrete structure based on the saturation calculated by the saturation calculation means (see, for example, Patent Document 1). With this conventional crack detection device, the saturation value when there is a crack and the saturation value when there is no crack, even if the surface of the concrete structure is dirty and the crack is not easily visible In comparison, the presence or absence of cracks is detected.

  As a technique for recognizing the float on the concrete surface, a method based on a hitting sound investigation has been developed. A conventional hammering inspection apparatus includes a hammer that strikes a concrete structure, a rotating shaft that rotates with the hammer supported at both ends, and a motor that generates a driving force for rotationally driving the rotating shaft. And a telescopic rod that is gripped by an operator with the rotating shaft supported at the tip (see, for example, Patent Document 2). In this conventional hammering sound inspection device, a hammer is repeatedly collided with a concrete structure by rotating a rotating shaft by a motor, thereby hitting the concrete structure.

JP 2014-006219

JP 2016-142723 A

  Conventional crack detection devices detect the presence or absence of cracks based on the saturation of the photographed image, but there is a problem that it is not possible to evaluate the standard crack angle when evaluating the flaking of concrete structures. is there. The conventional hammering sound inspection apparatus confirms the floating of the concrete structure by a hammering sound investigation. However, there is a problem that only the concrete structure before dropping can be grasped to the last. Peeling of a concrete structure is determined by three conditions: the geometry of the peeling block, the unevenness of the crack surface, and the angle of the crack surface. For this reason, in order to quantitatively evaluate the ease of peeling, it is necessary to grasp these three conditions, and the crack angle is very important in determining the risk of peeling. However, conventionally, there has been no method for determining the angle of cracking.

  The subject of this invention is providing the crack angle determination apparatus and crack angle determination method which can determine the angle of a crack easily.

The present invention solves the above-mentioned problems by the solving means described below.
In addition, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this embodiment.
As shown in FIG. 1, FIG. 2 and FIG. 4, the invention of claim 1 is a crack angle (θ) formed by a crack (C) in the depth direction of the object (M) and the surface (M ₁ ) of the object. A crack angle determination device for determining a crack at each hitting position based on vibrations generated when the surface of the object on the crack is hit at a plurality of hitting positions (P ₁ ,..., P _N ). Crack depth calculation unit (14) for calculating the depth (h ₁ ,..., H _N ), and crack angle calculation unit (18) for calculating the crack angle based on the calculation result of the crack depth calculation unit. It is a crack angle determination apparatus (4) provided with these.

According to a second aspect of the present invention, in the crack angle determination device according to the first aspect, as shown in FIGS. 4 and 5, the crack depth calculation unit generates vibrations when hit at the plurality of hitting positions. The crack angle determination device is characterized in that the crack depth is calculated based on the peak of the spectrum (I) of the natural frequency (f ₀ ).

  According to a third aspect of the present invention, in the crack angle determination device according to the second aspect, as shown in FIG. 6, the crack depth calculation unit calculates the peak of the natural frequency spectrum of the vibration and the crack depth. The crack angle determination device is characterized in that the crack depth is calculated based on the correlation.

According to a fourth aspect of the present invention, in the crack angle determination device according to any one of the first to third aspects, as shown in FIGS. 1, 2, and 4, the crack angle calculation unit includes: The crack angle is calculated based on the striking distance (d ₁ ,..., D _N ) between the striking position and the crack end (P ₀ ) and the crack depth at each striking position. An angle determination device.

In the invention of claim 5, as shown in FIGS. 1, 2, 4 and 7, the crack angle formed by the crack (C) in the depth direction of the object (M) and the surface (M ₁ ) of the object (M). A crack angle determination method for determining (θ), wherein each hit is made based on vibrations generated when the surface of the object on the crack is hit at a plurality of hit positions (P ₁ ,..., P _N ). Crack depth calculation step (# 150) for calculating the crack depth (h ₁ ,..., H _N ) at the position, and crack angle calculation for calculating the crack angle based on the calculation result in the crack depth calculation step A crack angle determination method (# 100) including a step (# 160).

  According to a sixth aspect of the present invention, in the crack angle determination method according to the fifth aspect, as shown in FIG. 4 and FIG. 5, the crack depth calculation step includes vibrations generated when hitting at the plurality of hitting positions. A crack angle determination method comprising a step of calculating the crack depth based on a peak of the natural frequency spectrum (I).

  According to a seventh aspect of the present invention, in the crack angle determination method according to the sixth aspect, as shown in FIG. 6, the crack depth calculation step includes a peak of a spectrum of the natural frequency of the vibration and the crack depth. It is a crack angle determination method characterized by including the process of calculating the said crack depth based on correlation.

The invention of claim 8 is the crack angle determination method according to any one of claims 5 to 7, wherein the crack angle calculation step includes each of the crack angle calculation steps as shown in FIGS. And a step of calculating the crack angle based on the striking distance (d ₁ ,..., D _N ) between the striking position and the crack end (P ₀ ) and the crack depth at each striking position. And a crack angle determination method.

  According to the present invention, the crack angle can be easily determined.

1 is an overall view schematically showing a crack angle determination device according to an embodiment of the present invention. It is a block diagram which shows typically the crack angle determination apparatus which concerns on embodiment of this invention. It is a conceptual diagram for demonstrating the crack angle determination method by the crack angle determination apparatus which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the relationship between the spectrum intensity | strength and crack depth in each hit position of the crack angle determination apparatus which concerns on embodiment of this invention. It is a wave form diagram which shows typically a calculation result of a spectrum intensity calculation part of a crack angle judging device concerning an embodiment of this invention as an example. It is a conceptual diagram which shows typically the data structure of the correlation information storage part of the crack angle determination apparatus which concerns on embodiment of this invention as an example. It is process drawing for demonstrating the crack angle determination method which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The object M shown in FIGS. 1 to 4 is a determination target for which the angle θ of the crack C is determined by the crack angle determination device 4. The object M is a fixed structure (civil engineering structure) such as a concrete structure using concrete as a main material. The object M, for example, in a tunnel that passes through a ground such as a mountainside and passes a moving body such as a train, suppresses and prevents deformation and collapse of the ground and prevents water leakage. It is a tunnel lining that maintains its function. The object M has a crack C in the depth direction of the object M. The surface M ₁ is the inner surface of the object M. The surface M ₁ is, for example, the inner surface of the tunnel lining.

The crack C is a crack generated in the object M. The crack C propagates from the surface M ₁ of the object M to the inside of the object M or from the inside of the object M to the surface M _{1 of the} object M. The crack C is, for example, an oblique crack that progresses in an oblique direction when the compressive stress acts on the inner surface side of the object M and contracts and the tensile stress acts on the outer surface side of the object M and extends. The opening C ₁ is an end of a crack C on the surface M ₁ side of the object M. The crack angle θ is an angle formed by the crack C in the depth direction of the object M and the surface M _{1 of the} object M.

  A crack angle determination system 1 shown in FIG. 1 is a system for determining a crack angle θ. The crack angle determination system 1 includes a vibration device 2, a vibration detection device 3, a crack angle determination device 4, and the like. The crack angle determination system 1 detects a vibration generated when the object M is vibrated by the vibration device 2 by the vibration detection device 3, and the crack angle determination device 4 cracks based on the detection result of the vibration detection device 3. The angle θ is evaluated. The crack angle determination system 1 detects vibration generated when the vibration device 2 is hit by the vibration device 2 on the crack C, and obtains a measurement result having a spectrum peak at several specific natural frequencies. .

1 to 3 is a device that vibrates an object M. The vibration exciter 2 strikes the surface M ₁ of the object M to vibrate the object M. The vibration device 2 strikes the object M by a user's operation and applies a striking force (excitation force) F to the object M. The vibration device 2 is a vibrator such as an impact hammer (impulse hammer) capable of grasping the striking force F applied to the object M, for example. Vibrator 2, as shown in FIG. 1, the striking point P ₁ the surface M ₁ more of the object M on the cracks C, ..., striking at P _N. The vibration device 2 includes a load detection unit (load cell) that detects a striking force F generated when an impact is applied to the object M, and a striking force detection signal corresponding to the striking force F that vibrates the object M. (Battering force information) is output to the crack angle determination device 4.

The vibration detection device 3 illustrated in FIGS. 1 to 4 is a device that detects vibration generated in the object M. The vibration detection device 3 detects vibration generated in the object M when the object M is vibrated by the vibration device 2. Vibration detecting device 3, the vibrating device more hitting position P ₁ of the surface M ₁ of the object M by 2, ..., when hit with a P _N, each striking points P _1, ..., a vibration generated by P _N Detect each. The vibration detection device 3 is, for example, an acceleration sensor that detects acceleration due to vibration of the object M. The vibration detection device 3 is detachably attached to the surface M _{1 of the} object M. The vibration detection device 3 outputs a vibration detection signal (vibration information) corresponding to the vibration generated on the surface M ₁ of the object M to the crack angle determination device 4.

A crack angle determination device 4 shown in FIGS. 1 and 2 is a device that determines a crack angle θ. The crack angle determination device 4 evaluates the crack angle θ generated in the object M based on the magnitude of the striking force F applied by the vibration device 2 and the magnitude of vibration detected by the vibration detection device 3. The crack angle determination device 4 evaluates the risk of the object M peeling off based on the crack angle θ of the object M. Cracking angle judging unit 4, as shown in FIG. 4, the spectral intensity (spectrum peak) I _1, ..., I ₄ is the striking position P _1, ..., crack depth h ₁ in the P _4, ..., and h ₄ since there is a correlation, the striking position P _1, ..., crack depth h ₁ for each P _N, ..., seek h _N, the crack depth h _1, ..., h _N Karahibiware angle θ _1, ..., θ _N Ask for. As shown in FIG. 2, the crack angle determination device 4 includes a striking force information input unit 5, a striking force information storage unit 6, a vibration information input unit 7, a vibration information storage unit 8, and a spectrum intensity calculation unit 9. The spectral intensity information storage unit 10, the orthogonal projection length calculation unit 11, the orthogonal projection length information storage unit 12, the correlation information storage unit 13, the crack depth calculation unit 14, and the crack depth information storage unit 15, an impact distance setting unit 16, an impact distance information storage unit 17, a crack angle calculation unit 18, a crack angle information storage unit 19, a flaking risk evaluation unit 20, an evaluation result information storage unit 21, and a crack An angle determination program storage unit 22, a display unit 23, a control unit 24, and the like are provided. The crack angle determination device 4 is configured by, for example, a personal computer and executes predetermined processing according to a crack angle determination program.

The crack depth H shown in FIG. 3 is the depth from the surface M _{1 of the} object M to the crack C. The crack length L is the distance from one end of the crack C to the other end. The orthogonal projection length D is the length of the crack C when the crack C is orthogonally projected on the surface M _{1 of the} object M. The orthogonal projection length D is a collection of perpendicular legs that have each point of the crack C dropped on the surface M _{1 of the} object M. The crack tip position P ₀ is an end of the crack C on the opening C ₁ side. The striking position P is a position where the striking force F is applied to the surface M _{1 of the} object M by the vibration device 2. The hitting distance d is a distance from the crack tip position P ₀ to the hitting position P. The crack depth h is a depth from the surface M ₁ of the object M to the crack C at the hitting position P. As shown in FIG. 3, the crack C having a crack angle θ which is not a complicated shape is the same characteristic regardless of the striking position P as long as the object M is in a range where the object M corresponding to the orthogonal projection length D of the crack C is floating. It has a spectrum peak at frequency f ₀ . There is a correlation between the spectral intensity I of the natural frequency f ₀ and the crack depth h. The crack angle determination device 4 identifies the crack angle θ of the object M using the correlation between the spectral intensity I of the natural frequency f ₀ and the crack depth h.

  The striking force information input unit 5 shown in FIG. 2 is means for inputting striking force information output by the vibration device 2. The striking force information input unit 5 outputs striking force information output from the vibration device 2 to the control unit 24. The striking force information input unit 5 is, for example, an interface (I / F) circuit that inputs a striking force detection signal from the vibration device 2 to the control unit 24. The striking force information storage unit 6 is means for storing striking force information output from the striking force information input unit 5. The striking force information storage unit 6 is, for example, a memory that stores striking force F applied to the object M by the vibration device 2 as striking force information.

The vibration information input unit 7 is means for inputting vibration information output from the vibration detection device 3. The vibration information input unit 7 outputs the vibration information output from the vibration detection device 3 to the control unit 24. The vibration information input unit 7 is, for example, an interface (I / F) circuit that inputs a vibration detection signal from the vibration detection device 3 to the control unit 24. The vibration information storage unit 8 is means for storing vibration information output from the vibration information input unit 7. As shown in FIG. 4, the vibration information storage unit 8 stores vibration information for each hitting position P ₁ ,..., P _N. The vibration information storage unit 8 is, for example, a memory that stores vibration information output by the vibration device 2.

Spectrum intensity calculation unit 9 shown in FIG. 2, a plurality of striking portions P _1, ..., spectral intensity I ₁ of the natural frequency f ₀ of the vibration generated when hit with a P _N, ..., means for calculating the I _N It is. As shown in FIG. 5, the spectrum intensity calculation unit 9 generates a spectrum waveform W based on the vibration detection signal output from the vibration information input unit 7, and calculates the spectrum intensity I of the natural frequency f ₀ of the vibration. Here, the spectrum waveform W shown in FIG. 5 is a waveform showing a Fourier spectrum when frequency analysis is performed on the waveform (vibration waveform) of the vibration detection signal generated when the impact force F is applied to the object M. The natural frequency f ₀ is a dominant frequency at which the amplitude spectrum becomes maximum when the vibration waveform of the object M is subjected to frequency analysis. The spectrum intensity calculation unit 9 performs, for example, a fast Fourier transformation (hereinafter referred to as FFT) process on the vibration detection signal output from the vibration information input unit 7 to obtain a spectral intensity (f0) of the natural frequency f ₀ of the vibration. (Spectrum size) I is calculated. For example, the spectrum intensity calculation unit 9 frequency-analyzes an acceleration response when the object M is vibrated by an FET analyzer, and calculates the spectrum intensity I of the natural frequency f ₀ of vibration. The spectrum intensity calculation unit 9 outputs the spectrum intensity I of the calculated natural frequency f ₀ of the vibration to the control unit 24 as a spectrum intensity signal (spectrum intensity information). The spectrum intensity information storage unit 10 is means for storing the spectrum intensity I calculated by the spectrum intensity calculation unit 9. The spectrum intensity information storage unit 10 is, for example, a memory that stores the spectrum intensity information output by the spectrum intensity calculation unit 9.

Orthogonal projection length calculating unit 11 shown in FIG. 2, a plurality of striking position of the surface M ₁ of the object M P ₁ on the cracks C, ..., based on the vibration generated when struck by P _N, the orthogonal projection length This is means for calculating the length D. The orthogonal projection length calculation unit 11 calculates the orthogonal projection length D based on the detection result of the vibration detection device 3. The orthogonal projection length calculation unit 11 calculates the orthogonal projection length D by analyzing vibration information output from the vibration detection device 3. Orthogonal projection length calculation unit 11, to different vibration by the presence or absence of the cavity due to internal cracks C of the object M, the hitting position P _1, ..., orthogonal projection length D on the basis of vibration information in the P _N Calculate. The orthogonal projection length calculation unit 11 uses the difference between the vibration in the region where the crack C exists in the object M and the vibration in the region where the crack C does not exist, to thereby calculate each hitting position P ₁ ,. An orthogonal projection length D is calculated based on the vibration information at P _N. The orthogonal projection length calculation unit 11 outputs the calculated orthogonal projection length D to the control unit 24 as an orthogonal projection length signal (orthographic projection length information). The orthogonal projection length information storage unit 12 is means for storing the orthogonal projection length D calculated by the orthogonal projection length calculation unit 11. The orthogonal projection length information storage unit 12 is, for example, a memory that stores the orthogonal projection length information output by the orthogonal projection length calculation unit 11.

The correlation information storage unit 13 shown in FIG. 2 is means for storing the correlation between the spectral intensity I of the natural frequency f ₀ of vibration and the crack depth h as correlation information. Correlation information storage unit 13, an orthogonal projection length D ₁ of the correlation between the spectral intensity I and crack depth h of the natural frequency f ₀ of the vibration, ... is stored as correlation information for each D _M. The correlation information storage unit 13 stores a correlation representing the relationship between the spectrum intensity I and the crack depth h as shown in FIG. Here, the vertical axis shown in FIG. 6 is the crack depth h, and the horizontal axis is the spectral intensity I. Correlation information storage unit 13, an orthogonal projection length D ₁ the relationship between the spectral intensity I and crack depth h, ..., and stores in advance a database for each D _M. The correlation information storage unit 13, for example, various cracking angle theta, leave the specimen orthogonal projection length D prepared in advance, the striking distance d _1, ..., striking force F ₁ at d _N, ..., F Correlation information stored in a database by organizing the relationships of the spectral intensities I ₁ ,..., I _N when hit by _N is stored. The correlation information storage unit 13 is a memory that stores the correlation between the spectral intensity I of the natural frequency f ₀ of the vibration and the crack depth h as correlation information.

Crack depth calculation unit 14 shown in FIG. 2, a plurality of striking position of the surface M ₁ of the object M P ₁ on the cracks C, ..., based on the vibration generated when struck by P _N, each hitting position P _1, ..., crack depth h ₁ in the P _N, ..., a means for calculating the h _N. Crack depth calculation unit 14, a plurality of strike position P _1, ..., based on the peak of the spectrum of the natural frequency f ₀ of the vibration generated when hit with a P _N, crack depth h _1, ..., h Calculate _N. Crack depth calculation unit 14, the peak and crack depth h ₁ of the spectrum of the natural frequency f ₀ of the vibration, ..., based on the correlation between the h _N, crack depth h _1, ..., calculates h _N To do. The crack depth calculation unit 14 is correlated with correlation information stored in the correlation information storage unit 13, spectrum intensities I ₁ ,..., I _N of the natural frequency f ₀ of vibration calculated by the spectrum intensity calculation unit 9. orthogonal projection length D ₁ projection length calculating unit 11 calculates, ..., on the basis of the D _M, crack depth h _1, ..., it calculates the h _N. As shown in FIG. 6, the crack depth calculation unit 14 selects correlation information corresponding to the orthogonal projection lengths D ₁ ,..., D _M calculated by the orthogonal projection length calculation unit 11, and the spectral intensity calculation unit Crack depths h ₁ ,..., H _N corresponding to the spectrum intensity information calculated by 9 are specified from this correlation information. The crack depth calculation unit 14 outputs the calculated crack depths h ₁ ,..., H _N to the control unit 24 as a crack depth signal (crack depth information). The crack depth information storage unit 15 is means for storing the crack depths h ₁ ,..., H _N calculated by the crack depth calculation unit 14. The crack depth information storage unit 15 is, for example, a memory that stores crack depth information output from the crack depth calculation unit 14.

The hitting distance setting unit 16 is means for setting hitting distances d ₁ ,..., D _N. Striking distance setting unit 16, the hitting position P ₁ from crack tip position P _0, ..., striking distance d ₁ to P _N, ..., sets the d _N as batting distance information. The hitting distance setting unit 16 is, for example, an input device or an auxiliary input device that inputs the hitting distances d ₁ ,..., D _N by a user's manual operation. The hitting distance setting unit 16 outputs the set hitting distances d ₁ ,..., D _N to the control unit 24 as a hitting distance signal (hitting distance information). The hitting distance information storage unit 17 is means for storing hitting distance setting information set by the hitting distance setting unit 16. The hitting distance information storage unit 17 is, for example, a memory that stores hitting distance information output by the hitting distance setting unit 16.

The crack angle calculation unit 18 is a means for calculating the crack angle θ based on the calculation result of the crack depth calculation unit 14. Cracking angle calculating section 18, the hitting position P _1, ..., striking distance d ₁ between the P _N and the crack distal end position P _0, ..., and d _N, each hitting position P _1, ..., cracks in the P _N The crack angle θ is calculated based on the depths h ₁ ,..., H _N. The crack angle calculation unit 18 calculates the crack angle θ by the following formula 1 based on the hit distance d and the crack depth h.

The crack angle calculation unit 18 outputs the calculated crack angles θ ₁ ,..., Θ _N to the control unit 24 as crack angle signals (crack angle information). The crack angle information storage unit 19 is means for storing the crack angles θ ₁ ,..., Θ _N calculated by the crack angle calculation unit 18. The crack angle information storage unit 19 is, for example, a memory that stores crack angle information output from the crack angle calculation unit 18.

  The flaking risk evaluation unit 20 is a means for evaluating the flaking risk of the object M. The flaking risk evaluation unit 20 evaluates the presence or absence of the flaking risk of the object M using the crack angle θ calculated by the crack angle calculation unit 18 as an evaluation criterion. For example, when the crack angle θ exceeds a predetermined value, the flaking risk evaluation unit 20 evaluates that the risk of occurrence of flaking is low on the object M, and when the crack angle θ is equal to or smaller than the predetermined value, flaking occurs on the object M. Assess that there is a high risk of The peeling risk evaluation unit 20 outputs to the control unit 24 the presence or absence of the risk of peeling after evaluation as an evaluation result signal (evaluation result information). The evaluation result information storage unit 21 is a means for storing the evaluation result of the peeling risk degree evaluation unit 20. The evaluation result information storage unit 21 is, for example, a memory that stores evaluation result information output from the peeling risk evaluation unit 20.

  The crack angle determination program storage unit 22 is a means for storing a crack angle determination program for determining the crack angle θ. The crack angle determination program storage unit 22 is a memory or the like that stores a crack angle determination program read from an information recording medium or a crack angle determination program fetched through an electric communication line.

  The display unit 23 is a means for displaying various information regarding the crack angle determination device 4. The display unit 23 includes, for example, striking force information stored in the striking force information storage unit 6, vibration information stored in the vibration information storage unit 8, spectrum intensity information stored in the spectrum intensity information storage unit 10, and orthogonal projection length information storage. Orthogonal projection length information stored in the section 12, correlation information stored in the correlation information storage section 13, crack depth information stored in the crack depth information storage section 15, and crack angle stored in the crack angle information storage section 19 Information and evaluation result information stored in the evaluation result information storage unit 21 are displayed on the display screen.

  The control unit 24 is a central processing unit (CPU) that controls various operations related to the crack angle determination device 4. The control unit 24 reads a crack angle determination program from the crack angle determination program storage unit 22 and executes a predetermined crack angle determination process according to the crack angle determination program. For example, the control unit 24 instructs the striking force information storage unit 6 to store the striking force information output from the striking force information input unit 5, and the vibration information storage unit to store the vibration information output from the vibration information input unit 7. 8, reading vibration information from the vibration information storage unit 8 and outputting the vibration information to the orthogonal projection length calculation unit 11 and the spectrum intensity calculation unit 9, or instructing the spectrum intensity calculation unit 9 to calculate the spectrum intensity I Instructing the spectrum intensity information storage unit 10 to store the spectrum intensity information output by the spectrum intensity calculation unit 9, reading the spectrum intensity information from the spectrum intensity information storage unit 10, and outputting it to the crack depth calculation unit 14, Commands the orthographic projection length calculation unit 11 to calculate the orthographic projection length D, and commands the orthographic projection length information storage unit 12 to store the orthographic projection length information output by the orthographic projection length calculation unit 11. Or the orthographic projection length information storage unit 12 reads the orthographic projection length information and outputs it to the crack depth calculation unit 14, or the correlation information storage unit 13 reads the correlation information and sends it to the crack depth calculation unit 14. To output, to command the crack depth calculation unit 14 to calculate the crack depth h, to command the crack depth information storage unit 15 to store the crack depth information output from the crack depth calculation unit 14, Read the crack depth information from the crack depth information storage unit 15 and output it to the crack angle calculation unit 18, or command the striking distance information storage unit 17 to store the striking distance information output by the striking distance setting unit 16, The striking distance information is read from the striking distance information storage unit 17 and output to the crack angle calculation unit 18, the crack angle calculation unit 18 is instructed to calculate the crack angle θ, and the crack is calculated. The crack angle information storage unit 19 is instructed to store the crack angle information output from the angle calculation unit 18, the crack angle information is read from the crack angle information storage unit 19, and is output to the flaking risk evaluation unit 20, or the flaking risk The degree evaluation unit 20 is instructed to evaluate the drop risk, the evaluation result information storage unit 21 is instructed to store the evaluation result information output from the drop risk evaluation unit 20, and various information is displayed on the display unit 23. Or command. The control unit 24 includes a striking force information input unit 5, a striking force information storage unit 6, a vibration information input unit 7, a vibration information storage unit 8, a spectrum intensity calculation unit 9, a spectrum intensity information storage unit 10, and an orthogonal projection length calculation. Unit 11, orthographic projection length information storage unit 12, correlation information storage unit 13, crack depth calculation unit 14, crack depth information storage unit 15, hitting distance setting unit 16, hitting distance information storage unit 17, crack angle calculation The unit 18, the crack angle information storage unit 19, the flaking risk evaluation unit 20, the evaluation result information storage unit 21, the crack angle determination program storage unit 22, and the display unit 23 are connected to be communicable with each other.

Next, a crack angle determination method according to an embodiment of the present invention will be described.
Hereinafter, the operation of the control unit 24 will be mainly described.
The crack angle determination method # 100 shown in FIG. 7 is a method for determining the crack angle θ formed by the crack C in the depth direction of the object M and the surface M _{1 of the} object M. Crack angle determination method # 100 includes striking process # 110, vibration detection process # 120, spectrum intensity calculation process # 130, orthographic length calculation process # 140, crack depth calculation process # 150, and crack angle. It includes a calculation step # 160, a peeling risk evaluation step # 170, an evaluation result display step # 180, and the like.

In the hitting process # 110, the object M is hit at a plurality of hitting points P ₁ ,..., P _N. As shown in FIGS. 1 and 4, the user installs the vibration detection device 3 in the vicinity of the crack tip position P ₀ . The user sets the hitting distances d ₁ ,..., D _N from the hitting positions P ₁ ,..., P _N to be hit by the vibration device 2 to the crack tip position P ₀ by the hit distance setting unit 16. When the striking distance information regarding each striking distance d ₁ ,..., D _N is output from the striking distance setting unit 16 to the control unit 24, the control unit 24 outputs this striking distance information to the striking distance information storage unit 17, and the batting is performed. The hitting distance information is stored in the distance information storage unit 17. A plurality of striking position P ₁ on the surface M ₁ of the object M, ..., the addition hit by vibrating device 2 to P _N, the striking force F _1, ..., striking force information corresponding to F _N are vibrator 2 Is output to the striking force information input unit 5. The striking force information is input from the vibration device 2 to the control unit 24 through the striking force information input unit 5, and the control unit 24 outputs this striking force information to the striking force information storage unit 6, and the striking force information storage unit 6 is hit. Force information is stored.

In the vibration detection step # 120, vibration generated when the object M is hit at a plurality of hit points P ₁ ,..., P _N is detected. As shown in FIGS. 1, 2 and 4, when the object M is vibrated by the vibrator 2, the striking position P _1, ..., from the vibration information vibration detection device 3 in accordance with the vibration for each P _N The vibration information is input to the vibration information input unit 7. Vibration information is input from the vibration detection device 3 to the control unit 24 through the vibration information input unit 7, the control unit 24 outputs this vibration information to the vibration information storage unit 8, and the vibration information is stored in the vibration information storage unit 8. .

In the spectrum intensity calculation step # 130, a plurality of striking portions P _1, ..., spectral intensity I ₁ of the natural frequency f ₀ of the vibration generated when hit with a P _N, ..., and calculates the I _N. The control unit 24 reads the vibration information from the vibration information storage unit 8, and the control unit 24 outputs the vibration information to the spectrum intensity calculation unit 9, and the control unit 24 calculates the spectrum intensity I to the spectrum intensity calculation unit 9. Command. As shown in FIG. 4, the striking force F ₁ on the surface M ₁ of the object M on the cracks C, ..., when allowed to act F _N, hitting position P _1, ..., the same natural frequency regardless P _N A spectrum peak appears at f ₀ . Hitting position P _1, ..., a spectrum waveform W of the vibration generated by the spectrum intensity calculation section 9 for each P _N, the spectral intensity I ₁ of the peak (intensity level) of the spectral waveform W, ..., spectral intensity calculated as I _N The unit 9 calculates. When the spectrum intensity calculation unit 9 outputs the spectrum intensity information to the control unit 24, the spectrum intensity information is output to the spectrum intensity information storage unit 10 by the control unit 24, and the spectrum intensity information is stored in the spectrum intensity information storage unit 10. .

In the orthogonal projection length calculation step # 140 shown in FIG. 7, the orthogonal projection length D is calculated. In the orthogonal projection length calculation step # 140, the orthogonal projection length D is calculated based on the vibration information output from the vibration detection device 3. The control unit 24 reads the vibration information from the vibration information storage unit 8, and the control unit 24 outputs the vibration information to the orthogonal projection length calculation unit 11, and the orthographic projection length calculation unit 11 has the orthogonal projection length D. The control unit 24 commands the calculation. Whether inside cracks C of the object M is present, the striking position P _1, ..., a striking force F ₁ to P _N, ..., it can be identified by the vibration generated when allowed to act F _N. Therefore, based on the cracked area and vibration information of the non-cracked region when it struck the surface M ₁ of the object M, the striking position P _1, ..., orthogonal projection whether cracks C are present within the P _N The length calculation unit 11 determines, and the orthogonal projection length calculation unit 11 calculates the orthogonal projection length D starting from the crack tip position P ₀ . When the orthogonal projection length calculation unit 11 outputs the orthogonal projection length information to the control unit 24, the orthogonal projection length information is output to the orthogonal projection length information storage unit 12 by the control unit 24, and the orthogonal projection length information storage is performed. The orthogonal projection length information is stored in the unit 12.

In the crack depth calculation step # 150, the crack angle θ is calculated. In crack depth calculation step # 150, a plurality of striking position of the surface M ₁ of the object M P ₁ on the cracks C, ..., based on the vibration generated when struck by P _N, each hitting position P _1, ... , P _N are calculated as crack depths h ₁ ,..., H _N. In crack depth calculation step # 150, a plurality of strike position P _1, ..., based on the peak of the spectrum of the natural frequency f ₀ of the vibration generated when hit with a P _N, crack depth h _1, ..., h _N is calculated. In crack depth calculation step # 150, the peaks and crack depth h ₁ of the spectrum of the natural frequency f ₀ of the vibration, ..., crack depth h ₁ based on the correlation between the h _N, ..., calculates h _N To do. The control unit 24 reads the spectral intensity information from the spectral intensity information storage unit 10, and the control unit 24 outputs the spectral intensity information to the crack depth calculation unit 14, and the orthographic projection length from the orthographic projection length information storage unit 12. The control unit 24 reads the height information, and the control unit 24 outputs the orthogonal projection length information to the crack depth calculation unit 14. Further, the control unit 24 reads the correlation information from the correlation information storage unit 13, and the control unit 24 outputs the correlation information to the crack depth calculation unit 14. When the control unit 24 instructs the crack depth calculation unit 14 to calculate the crack depth h, the correlation information corresponding to the orthogonal projection lengths D ₁ ,..., D _M as shown in FIG. 14 is extracted, the striking position P ₁ as shown in FIG. 4, ..., the spectral intensity I ₁ of each P _N, ..., crack depth h ₁ corresponding to the I _N, ..., cracking the h _N depth calculation The unit 14 calculates. When the crack depth calculation unit 14 outputs the crack depth information to the control unit 24, the control unit 24 outputs this crack depth information to the crack depth information storage unit 15, and the crack depth information storage unit 15 receives the crack depth. Information is stored.

In the crack angle calculation step # 160 shown in FIG. 7, the crack angle θ is calculated based on the calculation result in the crack depth calculation step # 130. In the crack angle calculation step # 160, the striking distances d ₁ ,..., D _N between the striking positions P ₁ ,..., P _N and the crack tip end P ₀ and the striking positions P _{1 ,.} The crack angle θ is calculated based on the crack depths h ₁ ,..., H _N at. The control unit 24 reads the crack depth information from the crack depth information storage unit 15, and the control unit 24 outputs the crack depth information to the crack angle calculation unit 18, and the correlation information from the correlation information storage unit 13. Is read by the control unit 24 and the control unit 24 outputs the correlation information to the crack depth calculation unit 14. When the control unit 24 instructs the angle calculating unit 18 cracking operations cracking angle theta, the striking position P _1, ..., crack depth h ₁ of each P _N, ..., crack angle theta ₁ which corresponds to h _N, ..., The crack angle calculation unit 18 calculates θ _N by Equation 1. When the crack angle calculation unit 18 outputs the crack angle information to the control unit 24, the control unit 24 outputs this crack angle information to the crack angle information storage unit 19, and the crack angle information storage unit 19 stores the crack angle information. .

In the delamination risk evaluation step # 170 shown in FIG. 7, the delamination risk of the object M is evaluated. The controller 24 instructs the peel risk evaluation unit 20 to evaluate the peel risk. The control unit 24 reads the crack angle information from the crack angle information storage unit 19, and the control unit 24 outputs the crack angle information to the flaking risk evaluation unit 20. As a result, the strike position P _1, ..., crack angle theta ₁ of P _N, ..., θ _N evaluates whether the spallation risk estimation unit 20 exceeds a predetermined value, the object M spalling risk Evaluate presence or absence. When the peeling risk evaluation unit 20 outputs the evaluation result information to the control unit 24, the control unit 24 outputs the evaluation result information to the evaluation result information storage unit 21, and the evaluation result information is stored in the evaluation result information storage unit 21. The

  In the evaluation result display step # 180, the display unit 23 displays the evaluation result in the peeling risk evaluation step # 150. When the control unit 24 instructs the display unit 23 to display the evaluation result of the risk of peeling, the control unit 24 reads the evaluation result information from the evaluation result information storage unit 21, and the control unit 24 displays the evaluation result information. Output to. As a result, the display unit 23 displays on the display screen whether or not there is a risk of the object M peeling off.

The crack angle determination device and the crack angle determination method according to the embodiment of the present invention have the following effects.
(1) In this embodiment, the surface M ₁ a plurality of strike position P ₁ of the object M on the cracks C, ..., based on the vibration generated when struck by P _N, each hitting position P _1, ..., The crack depth calculation unit 14 calculates the crack depths h ₁ ,..., H _N at P _N, and the crack angle calculation unit 18 calculates the crack angle θ based on the calculation result of the crack depth calculation unit 14. . For this reason, the crack angle θ can be easily calculated from a plurality of hits. As a result, since the crack angle θ greatly affects the risk of flaking, the crack angle θ can be used as a judgment index for the risk of flaking.

(2) In this embodiment, a plurality of strike position P _1, ..., based on the spectral peak of the natural frequency f ₀ of the vibration generated when hit with a P _N, crack depth crack the h depth calculation The unit 14 calculates. Therefore, it is possible to easily calculate the crack depth h by analyzing the frequency of the vibration of the object M and calculating the spectral intensity I of the natural frequency f ₀ of the vibration. Even if the spectrum output for a certain impact may vary, the determination accuracy of the crack angle θ can be improved by increasing the number of impacts.

(3) In this embodiment, the crack depth calculation unit 14 calculates the crack depth h based on the correlation between the spectrum peak of the natural frequency f ₀ of vibration and the crack depth h. For this reason, the crack depth h can be easily calculated by comparing the spectrum peak of the natural frequency f ₀ of the vibration with the correlation. For example, a correlation database is created in advance, and it is possible to easily determine how many crack angles θ are close to the result of hitting an unknown crack C.

(4) In this embodiment, the hitting position P _1, ..., a distance d ₁ between the P _N and the crack distal end position P _0, ..., and d _N, each hitting position P _1, ..., cracks in the P _N depth h _1, ..., based on the h _N, crack angle θ _1, ..., the angle calculation unit 18 cracks the theta _N is computed. For this reason, it is possible to evaluate the risk of the object M peeling off using the crack angle θ as an index.

The present invention is not limited to the embodiment described above, and various modifications or changes can be made as described below, and these are also within the scope of the present invention.
(1) In this embodiment, the case where the object M is a concrete structure has been described as an example. However, the present invention can also be applied to rocks other than the concrete structure. In this embodiment, the case where the object M is a tunnel lining has been described as an example. However, the present invention can be applied to a concrete structure other than the tunnel lining.

(2) In this embodiment, the case where the vibration detection device 3 is an acceleration sensor that detects the vibration of the object M has been described as an example, but a noise meter that detects noise radiated by the vibration of the object M, the object M The present invention can also be applied to a displacement meter that detects a displacement due to vibrations. In this embodiment, the case where the orthogonal projection length D is calculated based on the vibration generated when the striking force F is applied to the surface M ₁ of the object M has been described as an example. The orthogonal projection length D can also be calculated based on the noise generated when the striking force F is applied to the surface M ₁ . Is this case, based on the noise cracked area and the non-cracking region when struck the surface M ₁ of the object M (impact sound), the striking position P _1, ..., there are cracks C in the interior of P _N The orthogonal projection length calculation unit 11 determines whether or not, and the orthogonal projection length calculation unit 11 calculates an orthogonal projection length D starting from the crack tip position P ₀ . Further, in this embodiment, the striking position P _1, ..., crack angle theta ₁ per P _N, ..., the angle calculation unit 18 cracks the theta _N has been described as an example a case of calculating, cracking angle theta ₁ ,..., Θ _N can be averaged to calculate the crack angle θ.

DESCRIPTION OF SYMBOLS 1 Crack angle determination system 2 Excitation apparatus 3 Vibration detection apparatus 4 Crack angle determination apparatus 9 Spectral intensity calculation part 11 Orthographic projection length calculation part 13 Correlation information storage part 14 Crack depth calculation part 18 Crack angle calculation part 20 Peeling risk Degree evaluation part 24 Control part M Object M ₁ surface C Crack C ₁ opening P ₀ Crack tip position (crack end)
L crack length _{F, F 1, ..., F} N striking force _{P, P 1, ..., P} N striking position _{d, d 1, ..., d} N striking distance _{I, I 1, ..., I} N spectral intensity (spectrum )
H, h, h ₁ , ..., h _N crack depth D, D ₁ , ..., _DM orthogonal projection length θ, θ ₁ , ..., θ _N crack angle W spectrum waveform

Claims (8)

A crack angle determination device for determining a crack angle formed by a crack in the depth direction of an object and the surface of the object,
A crack depth calculation unit that calculates the crack depth at each hitting position based on vibrations generated when the surface of the object on the crack is hit at a plurality of hitting positions;
Based on the calculation result of the crack depth calculation unit, a crack angle calculation unit that calculates the crack angle;
A crack angle determination device comprising: In the crack angle judging device according to claim 1,
The crack depth calculation unit calculates the crack depth based on a spectrum peak of a natural frequency of vibration generated when hitting at the plurality of hitting positions;
Crack angle determination device characterized by. In the crack angle judging device according to claim 2,
The crack depth calculator calculates the crack depth based on the correlation between the peak of the natural frequency spectrum of the vibration and the crack depth;
Crack angle determination device characterized by. In the crack angle determination apparatus according to any one of claims 1 to 3,
The crack angle calculation unit calculates the crack angle based on a hitting distance between each hitting position and a crack end and a crack depth at each hitting position;
Crack angle determination device characterized by. A crack angle determination method for determining a crack angle formed by a crack in the depth direction of an object and the surface of the object,
A crack depth calculation step for calculating a crack depth at each hitting position based on vibration generated when the surface of the object on the crack is hit at a plurality of hitting positions;
Based on the calculation result in the crack depth calculation step, a crack angle calculation step for calculating the crack angle;
Crack angle determination method including In the crack angle determination method according to claim 5,
The crack depth calculating step includes a step of calculating the crack depth based on a peak of a spectrum of a natural frequency of vibration generated when hitting at the plurality of hitting positions;
Crack angle determination method characterized by In the crack angle determination method according to claim 6,
The crack depth calculation step includes a step of calculating the crack depth based on the correlation between the peak of the natural frequency spectrum of the vibration and the crack depth;
Crack angle determination method characterized by In the crack angle determination method according to any one of claims 5 to 7,
The crack angle calculating step includes a step of calculating the crack angle based on a hitting distance between each hitting position and a crack end and a crack depth at each hitting position;
Crack angle determination method characterized by

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