WO2006090727A1

WO2006090727A1 - Method and device for inspecting filled state of grout

Info

Publication number: WO2006090727A1
Application number: PCT/JP2006/303138
Authority: WO
Inventors: Kazuya Mori; Ippei Torigoe
Original assignee: National University Corporation Kumamoto University
Priority date: 2005-02-24
Filing date: 2006-02-22
Publication date: 2006-08-31
Also published as: JPWO2006090727A1

Abstract

A method and a device capable of definitely inspecting the partial filled state of grout for a newly constructed structure or an existing PC structure despite the fact that they are non-destructive and extremely simple. A magnetic line of force is radiated, in a pulse form or periodically, to the PC structure (1) to be inspected by an electromagnet (6). The filled state of the grout (3) in the PC structure (1) is inspected based on the presence or absence or the intensity of vibration observed on the surface (1A) of the PC structure (1) correspondingly to the radiation of the magnetic line of force. When a void (8) is present in the grout (3) inside the PC structure (1), vibration is not almost locally observed on the surface (1A) of the PC structure (1) near a position where the void (8) is present. When the void (8) is not present in the grout (3), the vibration is observed on the approximately overall surface (1A) of the PC structure (1).

Description

Specification

Inspection method and inspection device for grout filling state

Technical field

The present invention relates to an inspection method and an inspection apparatus for inspecting a grout filling state in a PC structure in a so-called nondestructive manner.

Background art

[0002] In a PC (prestressed concrete) structure by a post-tension method, generally, a reinforcing material that is a ferrous metal material such as a steel wire or a steel rod is inserted into the concrete structure, and the reinforcement of the reinforcing material is used. The compression force is applied to the entire structure.

[0003] More specifically, force holes are made in a concrete structure and solidified in that state. A tension is applied to the hole through a reinforcing material such as a steel wire or a steel bar. The holes are filled with grout and solidified. In this way, the compressive force is applied to the entire PC structure including the grout that has been filled and solidified by the check tension of the tensioned reinforcing material.

[0004] However, it is often difficult in practice to completely fill the grout around the reinforcing material such as a steel rod without gaps. For example, even if you intend to fill the grout sufficiently evenly, so-called voids may occur.

[0005] When voids such as voids are generated in the PC structure, there is a possibility that sufficient strength as designed may not be ensured particularly in that portion. Further, in such a place where the grout is insufficiently filled, the reinforcing material may be corroded and the part may be broken. For this reason, it is necessary to inspect the filling state of the grout in the structure after construction.

[0006] As a conventional method for inspecting the state of filling grout in the sheath tube, an ultrasonic method, a shock elastic wave method, a radiation transmission method, or the like has been used. As a typical example, in the inspection method disclosed in Patent Document 1, an elastic wave vibration is propagated from one end to the other end by hitting one end of a PC steel material. At the other end, acoustic signals are obtained by receiving the propagating elastic waves. Based on the acoustic signal, the filling condition of the grout in the sheath tube is grasped. That is, in this inspection method, grout is filled around the PC steel material. Since the components of the acoustic signal differ depending on whether the force is filled or not, the grout filling state is grasped based on the difference in the components of the acoustic signal. In the ultrasonic method, ultrasonic waves are used in place of the elastic waves caused by the impact, and the grout filling state is grasped by the same action as the above-mentioned shock elastic wave method.

[0007] Further, for example, Patent Document 2 discloses a method of inspecting a grout filling state using radiation. In this inspection method, a detection object containing a labeling element is first mixed in a grout before filling, and neutrons are irradiated to a PC structure to be inspected that is filled with the grout. The neutron irradiation emits gamma rays of specific energy from the labeling element in the grout, so the grout filling state is grasped based on the intensity.

Patent Document 1: Japanese Patent Laid-Open No. 10-54140

Patent Document 2: Japanese Patent Laid-Open No. 2001-194324

Disclosure of the invention

[0009] However, in the inspection method using acoustic signal propagation (Patent Document 1), it is necessary to grasp whether or not there is a defect such as a void in the grout filling state over the entire length of the PC steel wire. However, it was practically impossible to grasp the partial filling state. In other words, it was impossible to locally inspect the presence or absence of a void at a desired position.

[0010] In the ultrasonic method, since much of the energy of the ultrasonic wave is reflected by the wall surface of the sheath tube, the grasped information is disturbed, and the state in the sheath tube can be clearly inspected. There were many cases where it was actually difficult.

[0011] In addition, in the inspection method using radiation (Patent Document 2), it is necessary to mix the labeling element in the grout before filling, and therefore in an existing structure in which the labeling element is not generally mixed. The fatal shortcoming was that it was impossible to check the grout filling condition.

[0012] The present invention has been made in view of a serious problem, and the purpose of the present invention is a non-destructive and extremely simple technique for a newly-installed or existing PC structure. It is an object of the present invention to provide a grout filling state inspection method and inspection apparatus capable of inspecting a typical filling state. [0013] The grout filling state inspection method of the present invention is a method for inspecting the grout filling state in a PC structure having a reinforcing material and grout incorporated therein, and is for a portion to be inspected of the PC structure. Inspect the vibrations that are generated due to the process of irradiating the external force magnetic field lines on the surface and the magnetic vibration of the reinforcing material corresponding to the magnetic field irradiations and are expected to propagate through the PC structure. Based on at least one of the measurement process on the surface of the target part and the measured vibration intensity or presence or vibration propagation time, grasp the grout filling information in the PC structure Process.

[0014] Further, the grout-filled inspection device of the present invention is compatible with magnetic field line irradiation means for irradiating the surface of the PC structure to be inspected with external magnetic force lines on the surface thereof, and irradiation with magnetic field lines. At least one of the vibration that is generated due to the magnetic vibration of the reinforcing material and is expected to propagate through the PC structure or the propagation time of the vibration is detected on the surface of the inspection target site. Based on at least one of the surface vibration measuring means to be measured and the vibration intensity measured by the surface vibration measuring means or the propagation time of the vibration, the grout filling state in the PC structure is determined. It is provided with a filling state information grasping means for grasping information.

[0015] Here, the process for grasping the grout filling state information or the filling state information grasping means described above is based on the presence / absence or strength of vibration, and the force generated by voids in the grout in the PC structure. If there is vibration or if the vibration energy intensity exceeds the specified value, the gap is generated in the grout, and it is determined that there is no vibration. When the predetermined vibration energy intensity is less than the value, it may be determined that a void is generated in the grout. By doing so, it is possible to clearly determine whether or not a force such as a so-called void is generated in the grout in a non-destructive manner.

[0016] Further, the process for grasping the grout filling state information or the filling state information grasping means determines the material type of the reinforcing material or the density or the kind of grout in the PC structure based on the propagation time of vibration. Even if it is something to do. In this way, the type of reinforcement material or the density or type of grout can be determined non-destructively. It becomes possible.

[0017] Further, when the general shape of the PC structure is linear, it may be generated due to magnetic stagnation vibration of the reinforcing material corresponding to the irradiation of the magnetic field lines and propagated in the PC structure. In the process of measuring the predicted vibration at one end in the longitudinal direction of the PC structure and grasping the information on the filling state of the grout, if there is vibration or if the predetermined vibration energy intensity is greater than or equal to the value It is determined that there is a void in the grout, and if there is no vibration or the specified vibration energy intensity is less than the value, it is determined that there is a void in the grout and there is no void. Good. In this way, when the outline of the PC structure is linear, it is possible to clearly determine the grout filling state inside the PC structure.

[0018] Further, in the process of irradiating the lines of magnetic force, in the process of irradiating the lines of magnetic force over a long duration based on a predetermined signal and grasping the information of the grout filling state, The detected vibration may be processed according to a predetermined signal to detect the vibration corresponding to the irradiation of pulsed magnetic field lines having a short duration. Also by such a method, it is possible to grasp the grout filling state in the PC structure, and it is possible to more clearly determine whether or not there is a void in the grout.

[0019] In the inspection method of the grout filling state according to the present invention, the magnetic field lines are pulsed or periodically irradiate the PC structure to be inspected from the outside to cope with the irradiation of the magnetic field lines. Measure the presence or absence of surface vibration of PC structures. Specifically, when a void or the like exists in the grout of the PC structure, vibration is not measured locally on the surface of the Pc structure near the position where the void exists. Or surface vibrations exceeding the specified vibration energy intensity are not measured. If there are no voids in the grout

Surface vibrations are observed over almost the entire PC structure. Or there is no position where vibration is not measured locally. In other words, surface vibrations of a predetermined strength or higher are measured everywhere. Based on the presence or absence of such surface vibrations, the partial filling state of the grout can be easily and clearly grasped in a non-destructive manner.

[0020] More specifically, when a void is present in the grout, the steel material or steel of that portion is used. Even if a reinforcing material such as a rod responds to the irradiation of magnetic field lines, the propagation of the vibration is interrupted by the presence of voids, so no vibration of a certain level or more is observed on the surface of the PC structure in that part. . Or, if there are no voids in the grout, the reinforcements such as steel and steel bars are hardened with a solidified grout, so the vibration of the reinforcement corresponding to the irradiation of magnetic field lines is It propagates to the surrounding grout and reaches the entire surface of the PC structure, which is observed as surface vibration. Based on the presence or absence of such surface vibration, the partial filling state of the PC structure to be inspected can be clearly identified.

[0021] In addition, when the object to be inspected has a linear shape such as a PC structure used for a bridge, for example, contrary to the above, a reinforcing material such as a steel material or a steel bar is used. If there is a nearly complete void around the reinforcing material, the stiffener generates stagnation vibration due to magnetic attraction, and the vibration

It reaches to one end in the longitudinal direction of the PC structure. On the other hand, if the periphery of the reinforcing material is almost completely filled with grout, the stiffening vibration of the reinforcing material does not occur or is weak, but at one end in the longitudinal direction of the PC structure. Vibration is hardly measured. In this way, even when a PC structure whose outline is linear is the object to be inspected, the grout filling state inside the PC structure is clearly grasped.

[0022] According to the grout filling state inspection method or inspection apparatus of the present invention, the filling state such as the presence or absence of wavy or partial unfilled portions of grout in the PC structure can be obtained by a simple operation. Can be clearly inspected. Therefore, accurate and real-time confirmation / evaluation of the safety of newly installed or existing PC structures can be realized.

Brief Description of Drawings

FIG. 1 is a partially omitted cross-sectional view for explaining a grout filling state inspection method according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of the inspection apparatus.

FIG. 3 is a partially omitted cross-sectional view for explaining another inspection method.

FIG. 4 is a waveform diagram showing a time stretch pulse and a detection signal when using it. FIG. 5 is a waveform diagram showing a short duration pulse, and a detection signal when using the pulse.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 schematically shows a grout filling state inspection method according to an embodiment of the present invention, and FIG. 2 shows a block configuration of a main part of an inspection apparatus used therefor. is there.

In the present embodiment, the object to be inspected is, for example, a post-tension PC structure 1, and the filling state of the grout 3 in the sheath tube 2 in the PC structure 1 is inspected. The horizontal / vertical! /, Inside the object 1 makes use of the fact that the PC steel wire 4 that is placed obliquely vibrates when irradiated with magnetic field lines.

Specifically, as shown in FIG. 1, the AE sensor 5 is arranged on the surface 1A of the PC structure 1, and the magnetic field lines are pulsed against the surface 1A of the PC structure 1 using the electromagnet 6. Irradiate with waveform or sine waveform. Then, the PC steel wire 4 vibrates corresponding to the irradiation of the magnetic field lines. The vibration propagates through the concrete part 7 inside the PC structure 1 as an inertia wave, but when the void 8 exists inside the PC structure 1 as shown in Fig. The propagation of vibration of 4 forces of PC steel wire is interrupted at the void 8 part. On the other hand, in the part where the void 8 does not exist, the vibration of 4 forces of PC steel wire is smoothly propagated through the continuous grout 3 to the surface of the concrete part 7. By measuring the presence / absence or strength of vibration propagating to the surface 1A of the PC structure 1 in this way, there is a void 8 inside the PC structure 1 to be inspected, and V, Can be inspected.

[0028] The electromagnet 6 is arranged near the surface 1A of the PC structure 1, and is a magnetic line irradiation means for irradiating the PC structure 1 with magnetic lines of force. It is controlled by such a control device and output in a pulse wave shape or a sine wave shape.

[0029] The AE sensor 5 is a surface vibration measuring means, and is installed at a position close to the electromagnet 6 on the surface 1A of the PC structure 1, and the PC steel wire 4 of the PC structure 1 corresponds to the irradiation of the magnetic field lines. The vibration of the elastic wave emitted from the surface and propagated to the surface 1A is measured. [0030] In addition to the electromagnet 6 and the AE sensor 5, the inspection device according to the present embodiment includes a first amplifier 9, an AZD converter 10, a personal computer 11, a CRT (Cathode Ray Tube) monitor 12, and a D / A converter 13. , And a second amplifier 14.

[0031] The personal computer 11 is a filling state information grasping means having a fast Fourier transform unit (FFT) 11A, a video device (VD) 11B, and a memory 11C, and controls the output of magnetic lines from the electromagnet 6 and an AE sensor. The video signal of the vibration of the elastic wave measured in 5 is performed. The control pattern of magnetic field line output and its control logic are stored in the memory 11C. The video signal of the vibration signal measured by the AE sensor 5 is performed by the high speed Fourier transform unit 11A and the video device (VD) 11B.

[0032] More specifically, the memory 11C stores a predetermined pulse waveform and a sine waveform corresponding to the material of the PC structure 1 to be inspected, and the electric signal is stored in the DZA converter 13 and the first waveform. 2Sent to electromagnet 6 through amplifier 14. The elastic wave received by the AE sensor 5 installed on the surface 1A of the PC structure 1 is amplified by the first amplifier 9, and then its frequency spectrum is obtained by the FFT 11A via the A / D converter 10. Be This frequency spectrum is displayed on the CRT monitor 12 via the video device 11B. The filling state inside the PC structure 1 is determined based on information such as frequency spectrum images and numerical values displayed on the CRT monitor 12.

Next, operational effects of the inspection apparatus according to the present embodiment will be described.

[0034] As shown in FIG. 1, when the magnetic field is applied to the surface 1A of the PC structure 1 by using the electromagnet 6, the PC steel wire 4 in the PC structure 1 is a ferromagnetic material. The PC steel wire 4 receives a magnetic attractive force in the magnetic field direction of the electromagnet 6. At this time, if, for example, the intensity of the magnetic field lines is adjusted to the pulse wave shape and output from the electromagnet 6, the PC steel wire 4 will vibrate in a roughly pulse wave shape accordingly.

[0035] When the grout 3 is completely filled in the sheath tube 2 without a gap, the vibration of the PC steel material 4 is transmitted from the sheath tube 2 in the PC structure 1 through the grout 3 in the sheath tube 2 to the surface. It propagates through the concrete part 7 between 1A and reaches the surface 1A. The elastic wave propagated to the surface 1A of the PC structure 1 in this way is caused by the AE sensor 5 disposed on the surface 1A. Is detected and converted into an electrical signal.

[0036] Here, the time t from when the pulsed magnetic lines of force are applied until the elastic wave is detected is V, the velocity of the elastic wave in the concrete part 7 is V, the PC steel wire 4 and the PC structure 1 If the distance to the surface 1 A is L1, the following equation (1) is obtained. Since the propagation speed of the magnetic field is theoretically the speed of light, the propagation time can be regarded as almost zero, so errors due to the propagation time and propagation distance can be ignored in practice. Needless to say t = Ll / v- (l)

[0037] Here, when the position of the PC steel wire 4 is known, based on the above time t, the strong wave that has generated an elastic wave inside the sheath tube 2 in response to the irradiation of the magnetic force line at this time It is also possible to determine whether the magnetic body is a PC steel wire 4 having a predetermined steel material force, a wire material having other material forces, and the like. The elastic wave velocity V in the concrete part 7 varies depending on the material and density of the concrete part 7, so that the material and density of the concrete part 7 are based on the measured time t. It is also possible to estimate.

[0038] For example, when the void 8 is present inside the sheath tube 2 (Fig. 1) and the grout 3 is insufficiently filled in the vicinity of the area to be inspected, it is possible to deal with the irradiation of magnetic field lines. Since the vibration of the PC steel wire 4 is interrupted at the void 8 and is not transmitted to the surface 1A, the surface 1A of the PC structure 1 hardly vibrates. Alternatively, even if it vibrates, it has no void 8, and the vibration that propagated through the part wraps around and reaches, so the intensity of the vibration energy is extremely low. Or the time t is a different value. Therefore, based on the waveform and intensity of vibration measured by the AE sensor 5 installed on the surface 1A of the PC structure 1 or the time t, it is possible to grasp the filling state of the grout 3 and It can be determined whether or not the void 8 exists.

[0039] Further, when the PC steel wire 4 is disposed at a relatively deep position of the PC structure 1, the elasticity generated by four PC steel wires corresponding to one rectangular wave electromagnetic pulse. The waves may not have enough vibration energy to reach the surface 1A of the PC structure 1. In such a case, it is effective to enter a continuous sinusoidal magnetic field line that induces longitudinal wave vibration of the PC structure 1. When the thickness of PC structure 1 is L2, the frequency fl of longitudinal wave vibration is given by the following equation (2) Sought by.

fl = 2 X L2 / v- (2)

[0040] Since the attractive force acting on the PC steel wire 4 is generated at a frequency twice that of the magnetic field lines, the frequency Fl of the magnetic field lines when the longitudinal vibration of the PC structure 1 is induced is given by the following equation (3) Is required.

Fl = L2 / v- (3)

[0041] When the grout 3 is completely filled with no gap around the PC steel wire 4, when a continuous sinusoidal magnetic field line having such a frequency is incident, longitudinal vibration generated from the PC steel wire 4 is generated. Is transmitted through grout 3 and concrete part 7 to surface 1A.

[0042] On the other hand, when the void 8 is generated around the PC steel wire 4, the vibration propagation of the PC steel wire 4 is interrupted at the void 8, so the PC structure 1 near that portion 1 On the surface 1A, almost no vibration is detected.

[0043] Thus, in the present embodiment, the filling state of the grout 3 in the PC structure 1 can be clearly inspected without being broken.

[0044] Next, another inspection method that is effective when the grout 3 is hardly filled in the PC structure 1 will be described with reference to FIG.

[0045] For example, a PC steel wire 4 may be arranged vertically in a bridge. In such a PC steel wire 4, the grout 3 may be completely unfilled. In such a case, if a force is applied to the PC steel wire 4, the PC steel wire 4 will stagnate like a string. Here, if the mass per unit length of PC steel wire 4 is p, the tension is T, and the length of the steel wire is L3, the stagnation fundamental frequency f2 of PC steel wire 4 is given by the following equation (4): Can be sought.

f2 = (TZ / o) ° ⁵ Z (2'L3) to (4)

In the present embodiment, the electromagnet 6 is arranged at the center of the PC steel wire 4, and the AE sensor 5 is arranged on the surface 1 A near the end 12 of the PC steel wire 4. Then, a magnetic force line having a frequency F2 obtained by the following equation (5) is output from the electromagnet 6 to irradiate the PC structure 1 with the magnetic force line.

F2 = (TZ P) ° ⁵ Z (4'L3 "(5)

[0047] When the grout 3 is not filled at all in the PC structure 1, the PC steel wire 4 is stiff like a string due to the irradiation of magnetic field lines having a frequency based on the formula (5). Causes vibration. The vibration is propagated to the end 4 A of the PC steel wire 4, and this is measured by the AE sensor 5.

[0048] On the other hand, when the grout 3 is completely filled in the PC structure 1, even if the magnetic lines of the frequency of the formula (5) are incident, the stagnation vibration is almost generated in the PC steel wire 4. Absent. Therefore, in such a case, vibration is not detected by the AE sensor 5 arranged at one end 4A of the PC steel wire 4.

In this way, in the present embodiment, it is possible to inspect whether or not the PC structure 1 is almost filled with the grout 3.

[0050] While the present invention has been described with reference to the embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in addition to the void 8 generated when the grout 3 is filled, it is needless to say that a void caused by, for example, retraction or cracking of the grout 3 after construction can be detected. In addition, the resonance frequency and intensity distribution of the generated vibration differ depending on the type of reinforcing material (PC steel wire 4 in the above embodiment) and the type of material of grout 3, so the PC structure to be inspected It is desirable that the above-described inspection is performed by appropriately selecting the pulse frequency and waveform of the magnetic field lines and the energy intensity adapted to the characteristics of the grout material used in the object 1. Needless to say.

Furthermore, in the above embodiment, the signal for driving the electromagnet 6 is the pulse waveform shown in FIG. 5A, that is, a signal having a short duration, but a signal having a long duration, for example, For example, it may be used for acoustic measurement, and a time stretch pulse may be used. Fig. 4 (A) shows an example of the waveform of the time stretch pulse, and Fig. 4 (B) shows an example of the waveform of the detection signal from the AE sensor 5 obtained from the PC structure 1 at this time. By processing this detection signal with a predetermined processing circuit, a waveform equivalent to the detection signal obtained when the pulse shown in FIG. 5 (A) is given as shown in FIG. Obtainable . As for the method of generating the time stretch pulse, for example, Nobuharu Aoshima (Computer-generated pulse signal applied for sound measurement J.Acoust.Soc.Am., 69 (5), May (1981), pp.l484-1488 ).

[0052] By driving the electromagnet 6 by the time stretching pulse in this way, the PC structure 1 is irradiated with magnetic field lines for a long duration. Then, by applying processing corresponding to the time bow I stretching pulse to the signal detected by the AE sensor 5 at V, vibration corresponding to pulsed magnetic field irradiation with a short duration is equivalently detected. The grout filling state in the PC structure 1 can be grasped more clearly. As a means of measuring surface vibrations, use a laser vibrometer instead of an acceleration sensor.

Industrial applicability

The present invention is applicable to a method and apparatus for non-destructively inspecting the state of grout charging inside a PC structure in the so-called civil engineering field. More specifically, for example, it can be suitably used in a method and apparatus for inspecting whether, for example, voids are generated in the filling state of grout filled around a PC steel wire in a PC structure such as a PC bridge. It is.

Claims

The scope of the claims

[1] A method for inspecting a filling state of the grout in a PC structure including a reinforcing material and a grout,

A process of irradiating the surface to be inspected of the PC structure with external force lines of magnetic force on its surface;

A process of measuring on the surface of the inspected part the vibration generated due to the magnetic vibration of the reinforcing material corresponding to the irradiation of the magnetic field lines and propagated through the PC structure;

A process for grasping information on a grout filling state in the PC structure based on at least one of measured vibration intensity and / or presence or vibration propagation time;

A grout filling state inspection method comprising:

[2] The process of grasping the information on the grout filling state is a process for determining whether or not there is a void in the grout in the PC structure based on the presence or absence or strength of vibration. If the vibration energy intensity is greater than or equal to the predetermined vibration energy intensity, it is determined that there is no void in the grout, and if there is no vibration or less than the predetermined vibration energy intensity threshold value. Determines that there is a void in the grout

The grout filling state inspection method according to claim 1, wherein:

[3] The process of grasping information on the grout filling state is a process of determining the type of material of the reinforcing material or the density or type of the grout in the PC structure based on the propagation time of vibration.

The grout filling state inspection method according to claim 1, wherein:

[4] When the general shape of the PC structure is linear, it is generated due to magnetic stagnation vibration of the reinforcing material corresponding to the irradiation of magnetic field lines and propagated through the PC structure. Is measured at one end in the longitudinal direction of the PC structure,

In addition, in the process of grasping the information on the grout filling state, voids are generated in the grout when there is vibration or when the vibration energy intensity threshold value is equal to or higher than a predetermined threshold value. V, it is determined that there is no vibration, and if it is less than the specified vibration energy intensity or less than the value, it is determined that there is no void in the grout.

The grout filling state inspection method according to claim 1, wherein:

[5] In the process of irradiating the lines of magnetic force, in the process of irradiating the lines of magnetic force for a long duration based on a predetermined signal and grasping the information of the grout filling state, By processing the detected vibration according to the predetermined signal, the vibration corresponding to the pulsed magnetic field irradiation equivalent to the short duration is detected, and the grout filling state in the PC structure is grasped. Do

The grout filling state inspection method according to claim 1, wherein:

[6] A device for inspecting a filling state of the grout in a PC structure including a reinforcing material and grout,

Magnetic field line irradiating means for irradiating an external force magnetic field line on the surface of the PC structure to be inspected;

At least one of the vibration generated due to the magnetic vibration of the reinforcing material corresponding to the irradiation of the magnetic field lines and expected to be propagated in the PC structure or the propagation time of the vibration Based on at least one of surface vibration measuring means for measuring the surface of the inspected part, vibration intensity measured by the surface vibration measuring means, and vibration propagation time. Filling state information grasping means for grasping information on the filling state of the dirt in the structure;

A grout filling state inspection apparatus characterized by comprising:

[7] The filling state information grasping means is a means for determining whether or not there is a void in the grout in the PC structure based on the presence or absence or strength of vibration. If the vibration energy intensity threshold is equal to or greater than the vibration energy intensity threshold, it is determined that there is a gap in the grout, and if there is no vibration or less than the predetermined vibration energy intensity threshold, Judge that there is a gap in the grout

The grout filling state inspection device according to claim 6, wherein:

[8] The filling state information grasping means determines a material type or a grout density or type in the PC structure based on a vibration propagation time. The grout filling state inspection device according to claim 6, wherein:

When the rough shape of the PC structure is linear, the surface vibration measuring means is arranged at one end in the longitudinal direction of the PC structure, and the magnetic stagnation vibration of the reinforcing material corresponding to the irradiation of the lines of magnetic force Measure vibrations that are expected to propagate through the PC structure due to

Further, the filling state information grasping means determines that there is a gap in the grout when there is vibration or when it is equal to or greater than a predetermined vibration energy intensity threshold value, and when there is no vibration or predetermined If the vibration energy intensity is lower than the value, it is determined that there is a void in the grout.

The grout filling state inspection device according to claim 6, wherein: