Grout filling state determination device, grout filling state determination system, grout filling state determination method, and grout filling state determination program

Abstract

A grout filling state determination device, system, determination method, and program are provided that can accurately determine the filling state of grout filled around the periphery of a PC steel rod. [Solution] This grout filling state determination device 10 has an X-ray irradiation unit 20, a detector 30, an image generation unit 50, an image identification unit 60, and a determination unit 80. The determination unit 80 has a first determination unit 81 that determines that a continuous line 7 is an ungrouted portion when a continuous line 7 appears that is a color different from the color of the base material 2 and the color of the PC steel rod 3 and extends along the periphery of the PC steel rod 3, and a second determination unit 82 that acquires the brightness values ​​of the continuous line 7, the base material 2, and the PC steel rod 3, and determines that the continuous line 7 is an ungrouted portion when the brightness value of the continuous line 7 differs from the brightness values ​​of the base material 2 and the PC steel rod 3.

Description

[Technical Field]

[0001] The present invention relates to a grout filling state determination device, a grout filling state determination system, a grout filling state determination method, and a grout filling state determination program for determining the filling state of grout filled in the peripheral portion of a PC steel rod embedded in a structure. [Background technology]

[0002] BACKGROUND ART Conventionally, structures such as bridges (PC bridges) made of prestressed concrete have been used, and so-called PC steel rods are embedded in such structures.

[0003] The PC steel rods are inserted into a tubular sheath, and the gap between the outer periphery of the PC steel rod and the inner periphery of the sheath is filled with a mortar-based filler called grout, covering the periphery of the PC steel rod. In this case, since the grout is filled into the gap, moisture is less likely to penetrate the gap, and the PC steel rods are less likely to rust.

[0004] However, if the voids are not sufficiently filled with grout, moisture can easily penetrate the voids, increasing the possibility of rust occurring in the PC steel rods. For this reason, it is necessary to determine the state of grout filling.

[0005] For example, Patent Document 1 listed below describes a method for inspecting defects in concrete structures using an impact echo method, in which elastic waves are input from the surface of the concrete structure by dropping a steel ball or the like, and the presence or absence of defects in the concrete structure is inspected from the response waveform from the concrete structure at that time. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-4604 Summary of the Invention [Problem to be solved by the invention]

[0007] The defect inspection method described in Patent Document 1 is an impact echo method, which indirectly inspects for defects from the response waveform of elastic waves, and does not allow visual confirmation of the grout filling state. Therefore, the accuracy of determining the grout filling state may be insufficient depending on factors such as the environment of the inspection site and the shape and thickness of the structure.

[0008] Therefore, an object of the present invention is to provide a grout filling state determination device, a grout filling state determination system, a grout filling state determination method, and a grout filling state determination program that can accurately determine the filling state of grout filled around the periphery of a PC steel rod. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the present invention is to A grout filling state determination device for determining the filling state of grout filled in the periphery of a PC steel rod embedded in a structure, an X-ray irradiation unit that irradiates the structure with X-rays; a detector for detecting X-rays transmitted through the structure; an image generating unit that generates an X-ray transmission image of the structure based on the X-rays detected by the detector; an image identification unit that identifies a PC steel rod image, which is an X-ray transmission image of the PC steel rod to be determined, from the X-ray transmission image; A determination unit that determines the filling state of the grout based on the PC steel rod image, the determination unit is a first determination unit that determines a predetermined color in the PC steel rod image as the base material (concrete, etc.) of the structure and another predetermined color as the PC steel rod, and when a continuous line appears in a color different from the color of the base material and the color of the PC steel rod extending along the periphery of the PC steel rod, determines the continuous line to be an ungrouted portion that is not filled with grout; The present invention is characterized in that it has a second judgment unit that, when the first judgment unit judges the continuous line to be the un-grout-filled portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel rod, and judges the continuous line to be the un-grout-filled portion when the brightness value of the continuous line differs from the brightness value of the base material and the brightness value of the PC steel rod.

[0010] In an X-ray image, the lower the amount of X-ray absorption, the easier it is for X-rays to penetrate, so areas with low X-ray absorption usually appear white (note that if the X-ray image is inverted, they appear black). Therefore, if there are voids around the periphery of the PC steel rod, the voids will appear white because X-rays can easily penetrate them.

[0011] Furthermore, because grout is a low-viscosity liquid, it extends continuously along the periphery of the PC steel rods.The amount of X-ray absorption by grout is not clearly different from that of the base material of the structure or the PC steel rods, so when grout extends along the periphery of the PC steel rods, in the X-ray image, there is no clear visual difference between the grout and the base material or the periphery of the PC steel rods.

[0012] Therefore, if grout is not filled in the periphery of the PC steel rod and a gap exists, as described above, X-rays can easily pass through the gap, and a continuous line will appear extending along the periphery of the PC steel rod, and this continuous line can be determined to be an ungrouted portion where grout has not been filled.

[0013] In the grout filling state determination device of the present invention, two determination units, the first determination unit and the second determination unit, determine whether or not grout is filled around the periphery of the PC steel rod.However, if the determination is made solely by the first determination unit, it will depend solely on the X-ray image, and therefore the determination accuracy may be insufficient due to various factors, such as the on-site environment, such as the weather at the time the X-ray image is taken, the setting position and posture of the device, and the thickness of the structure.

[0014] In this regard, in the grout filling state determination device of the present invention, first, the first determination unit determines whether or not there is an un-grouted portion based on the presence or absence of a continuous line extending along the periphery of the PC steel rod (based on the X-ray transmission image, the continuous line along the periphery of the PC steel rod is identified as an un-grouted portion), and then, if the brightness value of the continuous line differs from the brightness value of the base material or the PC steel rod, the second determination unit determines that the continuous line is an un-grouted portion (the brightness value is converted into a numerical value and evaluated).This is a two-stage determination process in which the continuous line extending along the periphery of the PC steel rod is determined to be an un-grouted portion.

[0015] In other words, the continuous line extending along the peripheral portion of the PC steel rod is not determined to be an un-grouted portion simply by being judged by the first judgment unit, but is only determined to be an un-grouted portion when judged by the second judgment unit based on the brightness value, making it possible to accurately determine whether or not grout has been filled around the peripheral portion of the PC steel rod.

[0016] In the grout filling state determination device of the present invention, The second determination unit creates a graph in which the vertical axis represents the brightness values ​​of the base material and the continuous line in the PC steel bar image and its surrounding area, and the horizontal axis represents the width of the portion in the PC steel bar image and its surrounding area corresponding to the vertical axis, and The portion corresponding to the peak value on the vertical axis of the graph may be determined to be the unfilled portion.

[0017] According to the above aspect, the second judgment unit configured as described above judges whether or not grout is filled around the periphery of the PC steel rod based on a graph based on brightness values ​​and the portion corresponding to the peak value on the vertical axis of the graph.At this time, when a peak value occurs on the vertical axis of the graph, the difference in brightness values ​​between the base material in the PC steel rod image and the portion not filled with grout becomes clear, thereby further improving the accuracy of judging whether or not grout is filled around the periphery of the PC steel rod.

[0018] In the grout filling state determination device of the present invention, The image specifying unit The apparatus may be configured to have a simulated figure creation unit that creates simulated figures of a predetermined shape for multiple PC steel bars within the range of the X-ray transmission image, and to identify the PC steel bar image to be judged from the multiple simulated figures created by the simulated figure creation unit.

[0019] According to the above aspect, since the image specifying unit has the above configuration, it is possible to reliably specify the PC steel rod to be judged from among a plurality of PC steel rods present in the X-ray transmission image.

[0020] In the grout filling state determination device of the present invention, The determination unit may be configured to include a third determination unit that determines the unfilled portion of the grout based on a brightness ratio X calculated by ((B / A)-1)×100(%), where A is the brightness value of the base material determined by the second determination unit and B is the brightness value of the continuous line.

[0021] According to the above aspect, the presence or absence of grout-filled portions at the periphery of the PC steel rod can be determined by three determination units, including not only the first and second determination units but also the third determination unit that determines the non-grout-filled portions based on the brightness ratio X, thereby further improving the accuracy of determining whether or not grout is filled at the periphery of the PC steel rod.

[0022] In the grout filling state determination device of the present invention, The third determination unit If the brightness ratio X is less than 5%, it is determined that the grout is filled in the periphery of the PC steel rod, When the brightness ratio X is 5% or more and less than 10%, it is determined that there is a possibility that the grout-unfilled portion exists in the peripheral portion of the PC steel rod, The apparatus may be configured to determine that when the brightness ratio X is 10% or more, the possibility that the unfilled grout portion exists in the peripheral portion of the PC steel rod is higher than when the brightness ratio X is 5% or more and less than 10%.

[0023] According to the above aspect, since the third judgment unit has the above configuration, the reliability and certainty of the judgment accuracy of the third judgment unit as to whether or not grout is filled around the periphery of the PC steel rod can be improved.

[0024] Another aspect of the present invention is A grout filling state determination system for determining the filling state of grout filled around a periphery of a PC steel rod embedded in a structure, an X-ray irradiation unit that irradiates the structure with X-rays; and a detector that detects the X-rays that have passed through the structure; a transmitter that transmits X-ray data detected by the detector; an image generating unit that generates an X-ray transmission image of the structure based on the X-ray data; an image identification unit that identifies a PC steel rod image, which is an X-ray transmission image of the PC steel rod to be determined, from the X-ray transmission image; A determination unit that determines the filling state of the grout based on the PC steel rod image, The determination unit a first determination unit that, when a predetermined color in the PC steel rod image is set to a base material of the structure and another predetermined color is set to the PC steel rod, and a continuous line extending along the periphery of the PC steel rod in a color different from the color of the base material and the color of the PC steel rod appears, determines that the continuous line is an ungrouted portion that is not filled with grout; The present invention is characterized in that it has a second judgment unit that, when the first judgment unit judges the continuous line to be the un-grout-filled portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel rod, and judges the continuous line to be the un-grout-filled portion when the brightness value of the continuous line differs from the brightness value of the base material and the brightness value of the PC steel rod.

[0025] Yet another aspect of the present invention is A grout filling state determination method for determining the filling state of grout filled in the periphery of a PC steel rod embedded in a structure, comprising: an X-ray irradiation unit irradiating the structure with X-rays; a detector detecting x-rays transmitted through the structure; generating an X-ray transmission image of the structure based on the X-rays detected by the detector by an image generating unit; an image specifying unit specifying a PC steel rod image, which is an X-ray transmission image of the PC steel rod to be determined, from the X-ray transmission image; a step in which a determination unit determines a filling state of the grout based on the PC steel rod image, The step by the determination unit is a first determination unit determining, when a continuous line extending along the periphery of the PC steel rod is formed in a color different from the color of the base material and the color of the PC steel rod, that the continuous line is an ungrouted portion that is not filled with grout; The method is characterized in that the second judgment unit, when the first judgment unit judges the continuous line to be the un-grout-filled portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel rod, and judges the continuous line to be the un-grout-filled portion when the brightness value of the continuous line differs from the brightness value of the base material and the brightness value of the PC steel rod.

[0026] Yet another aspect of the present invention is A grout filling state determination program that causes a computer to execute a grout filling state determination method for determining the filling state of grout filled in the periphery of a PC steel rod embedded in a structure, The method is characterized in that the computer is caused to execute the grout filling state determination method. [Effects of the Invention]

[0027] According to the present invention, a continuous line extending along the peripheral portion of a PC steel rod is not determined to be an un-grouted portion simply by being judged by the first judgment unit, but is only determined to be an un-grouted portion when judged by the second judgment unit based on the brightness value, thereby making it possible to accurately determine whether or not grout has been filled around the peripheral portion of the PC steel rod. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a schematic diagram showing an embodiment of a grout filling state determination device according to the present invention. [Figure 2] This is an X-ray image of grout present around the periphery of a PC steel bar. [Figure 3] This is an X-ray image of the PC steel rods with no grout present around the periphery. [Figure 4] FIG. 2 is a schematic explanatory diagram showing a state in which an X-ray irradiation unit irradiates a structure. [Figure 5] FIG. 10 is an explanatory diagram showing an example of a simulated figure. [Figure 6] 10 is a flowchart showing the steps for identifying a PC steel rod to be judged from an X-ray radiographic image. [Figure 7] 10 is a graph created by the second determination unit, with the horizontal axis representing the measurement width W1 and the vertical axis representing the luminance value. [Figure 8] This is an enlarged X-ray image of a key area where there is an unfilled area around the periphery of a PC steel bar. [Figure 9] This is an explanatory diagram showing the measurement width W1 on the horizontal axis and the brightness value on the vertical axis when calculating voids, which are areas not filled with grout. [Figure 10] This is an error bar graph with the horizontal axis representing the concrete thickness W2 and the vertical axis representing the brightness ratio X. [Figure 11] 10 is a flowchart showing a process of determining whether or not there is a portion not filled with grout by the determining unit. [Figure 12] 1 is a schematic diagram showing one embodiment of a grout filling state determination system according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] (One embodiment of a grout filling state determination device) Hereinafter, an embodiment of a grout filling state determination device according to the present invention will be described with reference to the drawings.

[0030] As shown in Figure 1, the grout filling state determination device 10 in this embodiment (hereinafter also simply referred to as "determination device 10") is a device for determining the filling state of grout filled in the peripheral portion (outer peripheral portion located radially outward) of a PC steel rod 3 embedded in a structure 1.

[0031] The structure 1 is made of prestressed concrete (abbreviated as "PC"), and the concrete portion other than the PC steel rods 3 forms the base material 2. PC steel rods 3 extending to a predetermined length and having a predetermined outer diameter are embedded in this base material 2. Furthermore, a plurality of reinforcing bars 5 other than the PC steel rods 3 are also embedded in the base material 2. The reinforcing bars 5 are shown in FIG. 4 etc.

[0032] As shown in Figure 9, the PC steel rod 3 is inserted into a tubular sheath 4, and the gap between the outer periphery of the PC steel rod 3 and the inner periphery of the sheath 4 is filled with grout, a mortar-based filling material.

[0033] As shown in Figure 1, the judgment device 10 is mainly composed of an X-ray irradiation unit 20 that irradiates X-rays onto the structure 1, a detector 30 that detects the X-rays that have passed through the structure 1, a processing unit 40 that performs predetermined processing based on the X-rays detected by the detector 30 to judge the grout filling state around the periphery of the PC steel rod 3, and a display unit 45 that displays the processing results, etc., from the processing unit 40.

[0034] The processing unit 40 also has an image generation unit 50 that generates an X-ray transmission image of the structure 1 based on the X-rays detected by the detector 30, an image identification unit 60 that identifies a PC steel rod image, which is an X-ray transmission image of the PC steel rod 3 to be judged, from the X-ray transmission image, and a judgment unit 80 that judges the grout filling state based on the PC steel rod image.

[0035] In the following description, the X-ray transmission image of the PC steel rod 3 will be referred to as a "PC steel rod image," and the X-ray transmission image of the reinforcing bar 5 will be referred to as a "reinforcing bar image."

[0036] The processing unit 40 is composed of, for example, a CPU, memory, storage media such as an HDD or SSD, peripheral devices, programs, etc., and is realized by at least one of the implemented hardware configuration and programs.

[0037] The processing unit 40 is connected to the detector 30 by a cable or the like, and X-ray data detected by the detector 30 is transmitted to the processing unit 40. Furthermore, the processing unit 40 may include a storage unit that temporarily or semi-permanently stores the X-ray data transmitted from the detector 30.

[0038] Furthermore, the display unit 45 is, for example, a display separate from the processing unit 40, a display integrally provided with the processing unit 40, or a display of a mobile device terminal or the like, and is connected to the image generation unit 50 and the image identification unit 60 via a cable, wireless communication means, or the like.

[0039] The X-ray irradiation unit 20 is movably held by an operating mechanism 21 that operates using a ball screw, a worm gear, a cam mechanism, or the like.

[0040] The detector 30 has a conventionally well-known configuration and includes a collimator that focuses X-rays incident on the housing of the detector 30, a scintillator that emits light due to the X-rays focused by the collimator, a photodetector that generates an electric signal based on the light from the scintillator, etc. The detector 30 is also movably held by an operating mechanism 31 similar to the operating mechanism 21 of the X-ray irradiation unit 20.

[0041] Furthermore, the structure 1 is disposed so as to be sandwiched between the X-ray irradiator 20 and the detector 30. When the X-ray irradiator 20 irradiates the structure 1 with X-rays, the X-rays pass through the structure 1 and are detected by the detector 30. The X-rays are irradiated in a radial projection range from the X-ray irradiator 20, that is, as shown in FIG. 4, the X-rays are irradiated in a range that gradually widens from the target (irradiation center L) of the X-ray irradiator 20 toward the detector 30.

[0042] The image generation unit 50 converts the X-ray information detected by the detector 30, i.e., the X-rays that have passed through the base material 2 of the structure 1 and the multiple PC steel rods 3 and reinforcing bars 5 embedded in the structure 1, into data, i.e., converts the X-ray data into an electrical signal, and then quantizes it at, for example, 32 bits, to generate X-ray transmission images of the base material 2 of the structure 1, the multiple PC steel rods 3, and the multiple reinforcing bars 5.

[0043] Figures 2 and 3 show X-ray images, with Figure 2 showing an X-ray image of the PC steel rod 3 with grout present around the periphery, and Figure 3 showing an X-ray image of the PC steel rod 3 with no grout present around the periphery.

[0044] In the case of Figures 2 and 3, areas with high X-ray absorption, i.e., the base material 2 of the structure 1 and the PC steel rods 3, appear black or near-black (such as gray), while areas with low X-ray absorption, i.e., areas where there is no grout and there are voids, appear white (note that when the X-ray transmission image is inverted from black to white, the opposite occurs, i.e., areas with low X-ray absorption appear black or near-black, and areas with high X-ray absorption appear white). The reason for this is as follows.

[0045] That is, the unfilled portions where grout has not been filled are voids as described above, and since moisture exists in the voids, the density of these voids and moisture is much smaller than that of the concrete which is the base material 2 of the structure 1, the main body of the PC steel rod 3, and the reinforcing steel 5. Therefore, X-rays can easily pass through the voids, and they appear white in the X-ray image.

[0046] On the other hand, the concrete that is the base material 2 of the structure 1, the main body of the PC steel rod 3, and the reinforcing bars 5 are prone to absorbing X-rays, and therefore appear black or nearly black in the X-ray transmission image.

[0047] The image identification unit 60 identifies a PC steel rod image, which is an image of the PC steel rod 3 to be determined, from the X-ray transmission image generated by the image generation unit 50. In other words, since not only a plurality of PC steel rods 3 but also a plurality of reinforcing bars 5 are embedded in the base material 2 of the structure 1, the base material 2, PC steel rod 3, and reinforcing bars 5 are visible in the X-ray transmission image, as shown in Figures 2 and 3. Therefore, the PC steel rod 3 to be determined is identified from the X-ray transmission image.

[0048] The image specifying unit 60 also has a simulated figure creating unit 70 that creates simulated figures of a predetermined shape for the plurality of PC steel rods 3 within the range of the X-ray transmission image. The simulated figure creating unit 70 is further configured to specify, from the plurality of simulated figures, an image of the PC steel rod that is to be used to determine the grout filling state.

[0049] That is, the simulated figure creation unit 70 creates a predetermined shape, for example, a two-dimensional geometric simulated figure, from predetermined parameters such as the position (which can also be considered as coordinates) of the PC steel rod 3 within the base material 2, the position of the X-ray irradiation unit 20, and the position of the detector 30.

[0050] Here, since X-rays are emitted in a radial projection range from the X-ray irradiation unit 20 (see Figure 4), the shape and dimensions in the X-ray transmission image will change depending on the buried positions of the PC steel rods 3 and reinforcing bars 5, the positions of the X-ray irradiation unit 20 and the detector 30, etc.

[0051] Furthermore, the X-ray transmission image is displayed as a two-dimensional image in black and white, and the shade of black and white becomes lighter the closer the PC steel rods 3 or reinforcing bars 5 are to the X-ray source, the X-ray irradiation unit 20. This is because the dark parts in the X-ray transmission image are diluted by scattering noise from the concrete, which is the base material 2 of the structure 1.

[0052] As described above, it is possible to determine the position of a specific PC steel rod 3 in the base material 2 of the structure 1 based on the dimensions and shading of the PC steel rod image and the reinforcing bar image in the X-ray transmission image.

[0053] Furthermore, the simulated figure creation unit 70 creates (models) the PC steel rod 3 to be determined, as well as other PC steel rods 3 and reinforcing bars 5, in a predetermined shape, for example, a spiral shape. The modeled shape may, of course, be a shape other than a spiral shape, for example, a cylindrical shape.

[0054] When the PC steel rod 3 or the reinforcing bar 5 is modeled in a spiral shape, the maximum outer diameter dimension of the spiral shape, i.e., the width between the maximum value of the spiral curve (the left end of the spiral shape in Figure 5) and the minimum value (the right end of the spiral shape in Figure 5), becomes the outer diameter of the PC steel rod 3 or the reinforcing bar 5.

[0055] The above-described simulated figures have the following significance: Within the range of the X-ray transmission images shown in Figures 2 and 3, the images of the PC steel bars and the reinforcing bars overlap each other, making them difficult to distinguish, and in particular, the boundaries of the outer peripheries of the PC steel bars 3 and the reinforcing bars 5 become difficult to discern. Here, by modeling the PC steel bar images and the reinforcing bar images into a predetermined shape that is simpler than the actual X-ray transmission images, the outer peripheries of the PC steel bars 3 and the like can be made clearer, making it easier to grasp their outer diameter dimensions.

[0056] The outer diameters of the PC steel rods 3 and reinforcing bars 5 embedded in the base material 2 of the structure 1 can usually be known in advance from the design drawings of the structure 1 at the time of construction. Therefore, it is possible to determine the positions in the base material 2 of the structure 1 where the PC steel rods 3 and reinforcing bars 5 are embedded, based on their positional relationship with the X-ray irradiation unit 20 and the detector 30. Therefore, it is possible to identify which image, among the images displayed in the X-ray transmission images shown in Figures 2 and 3, is of the PC steel rod 3 to be evaluated.

[0057] Moreover, the simulated figure creating unit 70 in this embodiment is configured to display the created simulated figures as a plurality of visible images on the display unit 45. In this case, a first simulated figure 71, a second simulated figure 72, and a third simulated figure 73 are displayed on the display unit 45 in this order from top to bottom.

[0058] That is, the simulated figure creation unit 70 models the PC steel rod image of the PC steel rod 3 and the reinforcing bar image of the reinforcing bar 5 within the range of the X-ray transmission image (projection range) into a spiral shape as described above, and displays these as a first simulated figure 71 on the upper screen 1 of the display unit 45 (see FIGS. 1 and 5). As described above, the outer diameter of the PC steel rod 3 or the reinforcing bar 5 can be determined from the width between the maximum and minimum values ​​of the spiral curve.

[0059] Furthermore, the simulated figure creation unit 70 displays the PC steel rod images of the PC steel rods 3 and the reinforcing bar images of the reinforcing bars 5 within the range of the X-ray transmission image in a predetermined level of shading corresponding to the layout within the base material 2 of the structure 1 (here, 10 levels are displayed, with the closer to the X-ray irradiation unit 20 the lighter the image and the farther the image the darker the image), and displays this shading display as a second simulated figure 72 on the middle screen 2 of the display unit 45 (see FIGS. 1 and 5). In other words, the layout of the PC steel rods 3 and the reinforcing bars 5 in the depth direction of the base material 2 of the structure 1 can be grasped.

[0060] Furthermore, the simulated figure creation unit 70 extracts only the PC steel rod 3 to be judged from the data on the PC steel rod 3 and reinforcing bars 5 obtained from the design drawings, etc. at the time of construction of the structure 1, the first simulated figure 71, and the second simulated figure 72, and displays its modeling shape as a third simulated figure 73 on the lower screen 3 of the display unit 45 (see Figures 1 and 5).

[0061] In addition, the simulated figure creation unit 70 matches (fits) the data on the PC steel rods 3 and reinforcing bars 5 obtained from the design drawings etc. at the time of construction of the structure 1, and the various simulated figures 71, 72, 73 displayed on the display unit 45 to the X-ray transmission image generated by the image generation unit 50, thereby identifying the PC steel rods 3 to be judged.

[0062] The specific process for identifying the PC steel rod 3 to be judged from the X-ray transmission image described above will be described in detail below in conjunction with FIG. 6 in the section explaining the grout filling judgment method.

[0063] Next, the determination unit 80 that determines the grout filling state based on the PC steel rod image will be described in detail.

[0064] The determination unit 80 of this embodiment includes a first determination unit 81, a second determination unit 82, and a third determination unit 83.

[0065] The first judgment unit 81 regards a predetermined color in the PC steel rod image as the base material 2 of the structure 1 and another predetermined color as the PC steel rod 3, and when a continuous line 7 (see Figures 1 and 3) appears that is a color different from the color of the base material 2 and the color of the PC steel rod 3 and extends along the periphery of the PC steel rod 3, it judges the continuous line 7 to be an ungrouted portion that has not been filled with grout.

[0066] As shown in Figure 3, if there is an un-grouted portion around the periphery of the PC steel rod 3, the un-grouted portion will be a gap as described above, and X-rays will easily pass through it, so a continuous line 7 extending along the periphery of the PC steel rod 3 will be visible. Therefore, if this continuous line 7 appears around the periphery of the PC steel rod 3 to be judged, it will be judged that there is likely to be a grouted portion around the periphery of the PC steel rod 3 that is not filled with grout.

[0067] On the other hand, when the first judgment unit 81 judges the continuous line 7 to be an ungrouted portion, the second judgment unit 82 acquires the brightness value of the continuous line 7, the base material 2, and the brightness value of the PC steel rod 3, and judges the continuous line 7 to be an ungrouted portion when the brightness value of the continuous line 7 is different from the brightness value of the base material 2 and the brightness value of the PC steel rod 3.

[0068] As described above, the first determination unit 81 determines that there is likely to be an unfilled portion around the periphery of the PC steel rod 3, but the accuracy of the determination may be insufficient. Therefore, in order to quantitatively determine the unfilled portion not only from the X-ray transmission image but also from the X-ray transmission image, the X-ray transmission image is quantized, for example, using brightness values ​​quantized at 32-bit gradation.

[0069] Specifically, the second judgment unit 82 first acquires the brightness of the continuous line 7, the base material 2, and the PC steel rod 3, and then, when the brightness value of the continuous line 7 is different from the brightness value of the base material 2 and the brightness value of the PC steel rod 3, judges the continuous line 7 to be an unfilled portion with grout.

[0070] In addition, the second judgment unit 82 creates a graph in which the vertical axis represents the brightness value of the base material 2 and the continuous line 7 in the PC steel bar image and its surrounding parts, and the horizontal axis represents the width W of the part in the PC steel bar image and its surrounding parts corresponding to the vertical axis, and is configured to judge the part corresponding to the peak value on the vertical axis of the graph as an unfilled part with grout.

[0071] FIG. 7 shows a graph created by the second determination unit 82. The horizontal axis represents the measurement width W1, and the vertical axis represents the brightness value. FIG. 8 shows an enlarged X-ray image of a key portion in the case where an ungrouted portion exists around the periphery of the PC steel rod 3. The second determination unit 82 then creates the graph shown in FIG. 7 mainly from the portion enclosed by the frame in FIG. 8.

[0072] 7 shows an average brightness value graph K1 created by plotting average brightness values, and a graph of absolute first derivatives, i.e., absolute first derivative graph K2 created by differentiating average brightness value graph K1. Note that peak values ​​in graph K2 can be clearly recognized from absolute first derivative graph K2.

[0073] 7, the range indicated by the symbol "E" is the brightness value at the outer diameter of the PC steel rod 3, the range indicated by the symbol "F" is the brightness value at the base material 2, the range indicated by the symbol "A" is the brightness value at the continuous line 7 on the left side in FIG. 8, and the range indicated by the symbol "B" is the brightness value at the continuous line 7 on the right side in FIG. 7. Graphs K1 and K2 in FIG. 7 show that the brightness value at the continuous line 7 has a significantly higher peak value than the brightness value at the base material 2.

[0074] That is, the absolute value of the first derivative of the brightness value of the base material 2 does not show a high peak value in graph K2, but the absolute value of the first derivative of the brightness value of the continuous line 7 shows a significantly high peak value in graph K2. Therefore, the presence or absence of this peak value makes it possible to confirm the presence or absence of the continuous line 7, and therefore the presence or absence of any portion not filled with grout.

[0075] Figure 9 shows an explanatory diagram for calculating voids, which are areas not filled with grout. The horizontal axis represents the measurement width W1, and the vertical axis represents the brightness value. The brightness value "lc" of the base material 2 is calculated using the following formula (1).

[0076]

number

[0077] Furthermore, "ls", which is the luminance value of the PC steel rod 3 (specifically, the luminance value of the base material 2, the air, and the PC steel rod 3), is calculated by the following formula (2).

number

[0078] Furthermore, the luminance value "la" of the continuous line 7 (specifically, the luminance value of the base material 2 and the air (gap)) is calculated by the following formula (3).

number

[0079] The third determination unit 83 determines the unfilled portion of grout based on the brightness ratio X calculated by ((B / A)-1)×100(%), where A is the brightness value of the base material 2 determined by the second determination unit 82 and B is the brightness value of the continuous line 7.

[0080] That is, although the brightness value "la" of the continuous line 7 can be calculated by the above formula (3), it tends to be slightly different from the brightness value of the continuous line 7 in an actual X-ray transmission image (the brightness value of the continuous line 7 in an actual X-ray transmission image tends to be lower than the brightness value calculated by formula (3)). This is thought to be due to the influence of noise from the base material 2, such as concrete. Therefore, the unfilled grout portion is determined based on the brightness ratio X, which is calculated by taking into account not only the brightness value B of the continuous line 7 but also the brightness value A of the base material 2.

[0081] Furthermore, the third determination unit 83 is configured to determine that grout is filled in the peripheral portion of the PC steel rod 3 when the brightness ratio X is less than 5%, to determine that there is a possibility that there is an unfilled portion in the peripheral portion of the PC steel rod 3 when the brightness ratio X is 5% or more and less than 10%, and to determine that there is a higher possibility that there is an unfilled portion in the peripheral portion of the PC steel rod 3 when the brightness ratio X is 10% or more than that when it is 5% or more and less than 10%.

[0082] FIG. 10 shows an error bar graph in which the horizontal axis represents the thickness of the base material 2, "concrete thickness W2," and the vertical axis represents the brightness ratio X. In other words, the error bar graph in FIG. 10 takes into consideration noise due to the base material 2, such as concrete. In this embodiment, the parameter used to calculate the brightness ratio X for each thickness W is "6," the average of the brightness ratios X for each thickness W is "X'," and "σ" is the standard deviation. The error bars for the brightness ratio X for each thickness W are displayed as X'±3σ (99.7%).

[0083] As shown in Figure 10, as the thickness of the base material 2 (concrete thickness W2) increases, the brightness ratio X tends to decrease. This is thought to be due to the influence of increased scattering noise caused by the base material 2, such as concrete, which causes the brightness value waveform to become dull (the waveform rises with a slope and the amplitude becomes smaller). In addition, the standard deviation σ is also taken into account when calculating the brightness ratio X.

[0084] As shown in Fig. 10, when the brightness ratio X is less than 5%, it is determined that grout is filled in the peripheral portion of the PC steel rod 3. When the brightness ratio X is 5% or more and less than 10%, it is determined that there is a possibility that there is an unfilled portion in the peripheral portion of the PC steel rod 3. Furthermore, when the brightness ratio X is 10% or more, it is determined that there is a higher possibility that there is an unfilled portion in the peripheral portion of the PC steel rod 3 than when the brightness ratio X is 5% or more and less than 10%. In this way, the brightness ratio X is used as a threshold value to determine whether or not there is an unfilled portion in three stages.

[0085] The specific processing of the determination by the determination unit 80 described above will be described in detail below in conjunction with FIG. 11 in the section describing the grout filling determination method.

[0086] (One embodiment of a grout filling state determination method) Next, an embodiment of the grout filling state determination method according to the present invention will be described. Note that the description of the configuration described in the description of the determination device 10 will be omitted.

[0087] This grout filling state determination method (hereinafter also referred to simply as the "determination method") includes the steps of an X-ray irradiation unit 20 irradiating X-rays onto the structure 1, a detector 30 detecting the X-rays that have passed through the structure 1, an image generation unit 50 generating an X-ray transmission image of the structure 1 based on the X-rays detected by the detector 30, an image identification unit 60 identifying a PC steel rod image of the PC steel rod 3 to be determined from the X-ray transmission image, and a determination unit 80 determining the grout filling state based on the PC steel rod image.

[0088] First, the process of identifying the PC steel rod 3 to be judged will be described in detail with reference to Fig. 6. First, (1) input the coordinates of the X-ray irradiation unit 20, i.e., input the position of the X-ray irradiation unit 20 relative to the structure 1 in which the PC steel rod 3 to be judged is embedded, into the processing unit 40, (2) input the coordinates of the detector 30, i.e., input the position of the detector 30 relative to the structure 1 into the processing unit 40, and (3) input the coordinates and diameter of the PC steel rod 3, i.e., input the position and diameter of the PC steel rod 3 to be judged relative to the structure 1 into the processing unit 40.

[0089] Next, based on the coordinates of the X-ray irradiation unit 20 and the detector 30 input in (1) and (2), the processing unit 40 calculates the distance (FSD (Focus Surface Distance)) from the focus of the X-ray irradiation unit 20 to the detector 30 (STEP 1).

[0090] Thereafter, the tilt angle of the X-ray irradiator 20 is input to the processor 40 (STEP 2). Next, the processor 40 calculates the positional relationship between the X-ray irradiator 20, the detector 30, the aim of the X-ray irradiator 20, and the projection range of the X-ray transmission image (STEP 3).

[0091] Then, the X-ray irradiation unit 20 irradiates the structure 1 with X-rays, and the image generation unit 50 generates an X-ray transmission image of the base material 2, PC steel rods 3, and reinforcing bars 5 of the structure 1, and also displays the X-ray irradiation unit 20, detector 30, the aim of the X-ray irradiation unit 20, and the projection range of the X-ray transmission image on a plan view output screen not shown (STEP 4).

[0092] The image generating unit 50 also displays the PC steel rod 3 with the diameter input in (3) above on the plan view output screen (STEP 5).

[0093] Next, the image specifying unit 60 calculates the position and diameter of the PC steel rod 3 projected onto the X-ray transmission image (STEP 6).

[0094] Thereafter, the simulated figure creation unit 70 models the PC steel rods 3 within the range (projection range) of the X-ray transmission image into a predetermined shape (here, a spiral shape) (see FIG. 5 ), and displays this as a first simulated figure 71 on the upper screen 1 of the display unit 45. Note that the reinforcing bars 5 within the projection range are also modeled and displayed on the display unit 45.

[0095] At the same time, the simulated figure creation unit 70 performs shading display processing on the PC steel rods 3 within the projection range, and displays the shading display as a second simulated figure 72 on the middle screen 2 of the display unit 45. Note that the reinforcing bars 5 within the projection range are also subjected to shading display processing and displayed on the display unit 45.

[0096] Furthermore, the simulated figure creation unit 70 extracts only the PC steel rod 3 to be judged from the data on the PC steel rod 3 and reinforcing bars 5 obtained from the design drawings etc. at the time of construction of the structure 1, the first simulated figure 71, and the second simulated figure 72, and displays its modeling shape as a third simulated figure 73 on the lower screen 3 of the display unit 45.

[0097] The first simulated figure 71, the second simulated figure 72, and the third simulated figure 73 are displayed on the display unit 45 at approximately the same time (STEP 7). Then, the simulated figure creation unit 70 matches the data on the PC steel rods 3 and reinforcing bars 5 obtained from design drawings etc. at the time of construction of the structure 1 with the X-ray transmission image generated by the image generation unit 50, and the various simulated figures 71, 72, and 73 displayed on the display unit 45, to identify the PC steel rod 3 to be judged (STEP 8).

[0098] The steps performed by the judgment unit 80 include a step in which the first judgment unit 81 determines a predetermined color in the PC steel rod image as the base material 2 of the structure 1 and another predetermined color as the PC steel rod 3, and when a continuous line 7 appears that extends along the periphery of the PC steel rod 3 in a color different from the color of the base material 2 and the color of the PC steel rod 3, determines the continuous line 7 to be an ungrouted portion that has not been filled with grout; and a step in which the second judgment unit 82, when the first judgment unit 81 determines that the continuous line 7 is an ungrouted portion, acquires the brightness values ​​of the continuous line 7, the base material 2, and the PC steel rod 3, and determines that the brightness value of the continuous line 7 is different from the brightness value of the base material 2 and the brightness value of the PC steel rod 3.

[0099] Specific steps for determining the presence or absence of unfilled grout portions by the determination unit 80 will be described in detail with reference to Fig. 11. Note that the steps up to the step of identifying the PC steel rod 3 to be determined (STEP 24 below) are also shown in Fig. 11 as preparatory steps for the discrimination step by the determination unit 80.

[0100] First, an image of the PC steel rod is acquired by the step of generating an X-ray transmission image by the image generating unit 50 described above (STEP 21).

[0101] Next, the PC steel rod images are sorted to determine whether or not it is possible to identify the PC steel rod 3 to be judged (STEP 22). At this time, if the PC steel rod image to be judged cannot be distinguished from the multiple PC steel rods, it is determined that the PC steel rod 3 cannot be judged (STEP 23), and the process of judging whether or not there is a portion not filled with grout by the judging unit 80 is completed.

[0102] On the other hand, if it is possible to distinguish the PC steel bar image to be judged from the multiple PC steel bar images in STEP 22, the process proceeds to the next STEP 24, where the PC steel bar 3 to be judged is identified. Note that the process of identifying the PC steel bar 3 has already been explained, so a detailed description will be omitted.

[0103] Next, the first judgment unit 81 judges whether or not there is a continuous line 7 on the periphery of the PC steel rod 3 (STEP 25). If the first judgment unit 81 judges that there is a continuous line 7 on the periphery of the PC steel rod 3, the process proceeds to STEP 26.

[0104] On the other hand, if the first judgment unit 81 determines that there is no continuous line 7 around the periphery of the PC steel rod 3, the judgment unit 80 determines that there is no unfilled grout area around the periphery of the PC steel rod 3 being judged (STEP 29), and the process of determining whether or not there is an unfilled grout area by the judgment unit 80 is completed.

[0105] Next, the second judgment unit 82 compares the brightness value of the continuous line 7 with the brightness value of the base material 2 and the brightness value of the PC steel rod 3 to determine whether there is a difference (STEP 26). In other words, if the first judgment unit 81 determines that there is a difference in the brightness value of the continuous line 7 with the brightness value of the base material 2 and the brightness value of the PC steel rod 3, the process proceeds to STEP 27.

[0106] On the other hand, if the second judgment unit 82 determines that there is no difference in the brightness value of the continuous line 7 compared with the brightness value of the base material 2 and the brightness value of the PC steel rod 3, the judgment unit 80 determines that there are no unfilled grout portions in the peripheral area of ​​the PC steel rod 3 being judged (STEP 29), and the process of determining whether or not there are any unfilled grout portions by the judgment unit 80 is completed.

[0107] Furthermore, the second judgment unit 82 creates a graph as shown in Figure 7, in which the vertical axis represents the brightness value of the base material 2 and continuous line 7 in the PC steel bar image and its surrounding area, and the horizontal axis represents the width W of the part in the PC steel bar image and its surrounding area corresponding to the vertical axis, and judges whether or not there is a peak value in the graph (STEP 27).

[0108] If the second determination unit 82 recognizes a peak value in the graph, the process proceeds to STEP 28. On the other hand, if the second determination unit 82 does not recognize a peak value in the graph, the determination unit 80 determines that there is no unfilled portion in the peripheral portion of the PC steel rod 3 being determined (STEP 29), and the process of determining whether or not there is an unfilled portion in the determination unit 80 is completed.

[0109] Next, the third determination unit 83 determines whether or not there is a portion not filled with grout, based on the brightness ratio X (STEP 28).

[0110] Then, if the brightness ratio X is less than 5%, the third judgment unit 83 judges that grout is filled in the peripheral area of ​​the PC steel rod 3, that is, judges that there is no part not filled with grout in the peripheral area of ​​the PC steel rod 3 being judged (STEP 29), and the process of determining whether or not there is a part not filled with grout by the judgment unit 80 is completed.

[0111] Furthermore, if the brightness ratio X is greater than or equal to 5% and less than 10%, the third judgment unit 83 judges that there is a possibility that an unfilled portion of grout exists around the periphery of the PC steel rod 3 (STEP 30), and the process of judging whether or not there is an unfilled portion of grout by the judgment unit 80 is completed.

[0112] Furthermore, when the brightness ratio X is 10% or more, the third judgment unit 83 judges that the possibility of there being an unfilled portion in the peripheral portion of the PC steel rod 3 is higher than when the brightness ratio X is 5% or more but less than 10% (STEP 31), and the process of determining whether or not there is an unfilled portion in the peripheral portion by the judgment unit 80 is completed.

[0113] (Action and effect) Next, the effects of the determination device 10 configured as described above will be described.

[0114] That is, since this determination device 10 has the determination unit 80 including the first determination unit 81 and the second determination unit 82 configured as described above, first, the first determination unit 81 determines the presence or absence of an unfilled portion of grout based on the presence or absence of the continuous line 7 extending along the periphery of the PC steel rod 3. That is, based on the X-ray transmission image, the continuous line 7 along the periphery of the PC steel rod 3 is identified as an unfilled portion of grout.

[0115] Thereafter, when the brightness value of the continuous line 7 differs from the brightness values ​​of the base material 2 and the PC steel rod 3, the second determination unit 82 determines that the continuous line 7 is a portion not filled with grout. In other words, the brightness value is quantified and evaluated.

[0116] In this way, this determination device 10 determines that the continuous line 7 extending along the peripheral portion of the PC steel rod 3 is an unfilled portion in a two-stage determination process performed by the first determination unit 81 and the second determination unit 82.

[0117] In other words, the continuous line 7 extending along the peripheral portion of the PC steel rod 3 is not determined to be an unfilled portion simply by being judged by the first judgment unit 81, but is only determined to be an unfilled portion when judged by the second judgment unit 82 based on the brightness value, so that it is possible to accurately determine whether or not grout has been filled around the peripheral portion of the PC steel rod 3.

[0118] Furthermore, in the judgment device 10 of this embodiment, the second judgment unit 82 creates a graph in which the vertical axis represents the brightness value of the base material 2 and the continuous line 7 in the PC steel bar image and its surrounding area, and the horizontal axis represents the width of the part corresponding to the vertical axis in the PC steel bar image and its surrounding area (see Figure 7), and is configured to judge the part corresponding to the peak value on the vertical axis of the graph as an unfilled part with grout.

[0119] According to the above aspect, the second judgment unit 82 configured as described above judges whether or not grout is filled in the peripheral portion of the PC steel rod 3 based on a graph based on brightness values ​​and the portion corresponding to the peak value on the vertical axis of the graph.At this time, if a peak value occurs on the vertical axis of the graph, the difference in brightness values ​​between the base material 2 in the PC steel rod image and the portion not filled with grout becomes clear, thereby further improving the accuracy of judging whether or not grout is filled in the peripheral portion of the PC steel rod 3.

[0120] Furthermore, in the judgment device 10 of this embodiment, the image identification unit 60 has a simulated figure creation unit 70 that creates simulated figures of a predetermined shape for multiple PC steel bars 3 within the range of the X-ray transmission image, and is configured to identify the PC steel bar image to be judged from the multiple simulated figures created by the simulated figure creation unit 70.

[0121] According to the above aspect, since the image specifying unit 60 has the above configuration, it is possible to reliably specify the PC steel rod 3 to be judged from among the multiple PC steel rods 3 present in the X-ray transmission image.

[0122] In addition, in the determination device 10 of this embodiment, the determination unit 80 is configured to have a third determination unit 83 that determines the unfilled portion of grout based on the brightness ratio X calculated by ((B / A)-1)×100(%), where A is the brightness value of the base material 2 determined by the second determination unit 82 and B is the brightness value of the continuous line 7.

[0123] According to the above embodiment, the presence or absence of grout-filled portions in the peripheral portion of the PC steel rod 3 can be determined by three determination units 81, 82, 83, including not only the first determination unit 81 and the second determination unit 82, but also the third determination unit 83 that determines the unfilled portions based on the brightness ratio X, thereby further improving the accuracy of determining whether or not grout is filled in the peripheral portion of the PC steel rod 3.

[0124] Furthermore, in the determination device 10 of this embodiment, the third determination unit 83 is configured to determine that grout is filled in the peripheral portion of the PC steel rod 3 when the brightness ratio X is less than 5%, to determine that there is a possibility that there is an unfilled portion in the peripheral portion of the PC steel rod 3 when the brightness ratio X is 5% or more and less than 10%, and to determine that there is a higher possibility that there is an unfilled portion in the peripheral portion of the PC steel rod 3 when the brightness ratio X is 10% or more than that when it is 5% or more and less than 10%.

[0125] According to the above aspect, since the third judgment unit 83 has the above configuration, the reliability and certainty of the judgment accuracy by the third judgment unit 83 of whether or not grout is filled in the peripheral portion of the PC steel rod 3 can be improved.

[0126] (One embodiment of a grout filling state determination system) A grout filling state determination system according to the present invention is shown in Fig. 12. Note that parts that are substantially the same as those in the determination device 10 are given the same reference numerals and their description will be omitted.

[0127] As shown in Figure 12, the grout filling state determination system 100 in this embodiment (hereinafter also simply referred to as the "determination system 100") has an X-ray irradiation unit 20, a detector 30, a transmission unit 35 that transmits X-ray data detected by the detector 30, a processing unit 40, an image generation unit 50 that generates an X-ray transmission image of the structure 1 based on the X-ray data, an image identification unit 60, and a determination unit 80.

[0128] The processing unit 40 also has a receiving unit (not shown) that receives the X-ray data from the transmitting unit 35. Furthermore, the receiving unit of the processing unit 40 and the transmitting unit 35 are connected via well-known wireless communication, a network line, etc. The X-ray data transmitted from the transmitting unit 35 may be stored and managed in a server, etc.

[0129] That is, a predetermined part of the parts constituting the processing unit 40 may be configured by a predetermined server. In this case, any of the other parts of the parts constituting the processing unit 40 may be configured by another server. In other words, the processing unit of the grout filling state determination system of the present invention may be configured by one or more servers.

[0130] The determination system 100 can also provide the same effects as the determination device 10.

[0131] (Grout filling status determination program) The present invention also includes a grout filling state determination program that causes a computer to execute a grout filling state determination method for determining the filling state of grout filled in the peripheral portion of a PC steel rod embedded in a structure 1, and that causes a computer to execute the grout filling state determination method.

[0132] It should be noted that the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. [Explanation of symbols]

[0133] 1···Structure, 2···Base material, 3···PC steel rod, 5···Reinforcing bar, 7··Continuous wire, 10···Grout filling status determination device (determination device), 20···X-ray irradiation unit, 30···Detector, 35···Transmission unit, 40···Processing unit, 45···Display unit, 50···Image generation unit, 60···Image identification unit, 70···Simulated figure creation unit, 80···Determination unit, 81···First determination unit, 82···Second determination unit, 83···Third determination unit.

Claims

1. A grout filling state determination device for determining the filling state of grout filled in the periphery of a PC steel rod embedded in a structure, an X-ray irradiation unit that irradiates the structure with X-rays; a detector for detecting X-rays transmitted through the structure; an image generating unit that generates an X-ray transmission image of the structure based on the X-rays detected by the detector; an image specifying unit that specifies a PC steel rod image, which is an X-ray transmission image of the PC steel rod to be determined, from the X-ray transmission image; A determination unit that determines the filling state of the grout based on the PC steel rod image, The determination unit a first determination unit that, when a continuous line extending along the periphery of the PC steel rod occurs in a color different from the color of the base material and the color of the PC steel rod, determines that the continuous line is an ungrouted portion that is not filled with grout; and A grout filling state determination device characterized by having a second determination unit that, when the first determination unit determines that the continuous line is the grout-unfilled portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel rod, and determines that the continuous line is the grout-unfilled portion when the brightness value of the continuous line is different from the brightness value of the base material and the brightness value of the PC steel rod.

2. The second determination unit A graph is created in which the ordinate represents the brightness value of the base material and the continuous line in the PC steel bar image and its surrounding area, and the abscissa represents the width of the portion in the PC steel bar image and its surrounding area corresponding to the ordinate, and 2. The grout filling state determination device according to claim 1, wherein a portion of the graph corresponding to a peak value on the vertical axis is determined to be the grout-unfilled portion.

3. The image specifying unit A grout filling state determination device as described in claim 1 or 2, which has a simulated figure creation unit that creates simulated figures of a predetermined shape for multiple PC steel rods within the range of the X-ray transmission image, and identifies the PC steel rod image to be determined from the multiple simulated figures created by the simulated figure creation unit.

4. The determination unit 3. The grout filling state determination device according to claim 1, further comprising a third determination unit that determines the grout-unfilled portion based on a brightness ratio X calculated by ((B / A)-1)×100(%), where A is the brightness value in the base material determined by the second determination unit and B is the brightness value in the continuous line.

5. The third determination unit If the brightness ratio X is less than 5%, it is determined that the grout is filled in the peripheral portion of the PC steel rod, When the brightness ratio X is 5% or more and less than 10%, it is determined that there is a possibility that the grout-unfilled portion exists in the peripheral portion of the PC steel rod, 5. The grout filling state determination device according to claim 4, wherein when the brightness ratio X is 10% or more, it is determined that the possibility that the grout-unfilled portion exists in the peripheral portion of the PC steel rod is higher than when the brightness ratio X is 5% or more and less than 10%.

6. A grout filling state determination system for determining a filling state of grout filled around a periphery of a PC steel rod embedded in a structure, comprising: an X-ray irradiation unit that irradiates the structure with X-rays; a detector for detecting X-rays transmitted through the structure; a transmitter that transmits X-ray data detected by the detector; an image generating unit that generates an X-ray transmission image of the structure based on the X-ray data; an image specifying unit that specifies a PC steel rod image, which is an X-ray transmission image of the PC steel rod to be determined, from the X-ray transmission image; A determination unit that determines the filling state of the grout based on the PC steel rod image, The determination unit a first determination unit that, when a continuous line extending along the periphery of the PC steel rod occurs in a color different from the color of the base material and the color of the PC steel rod, determines that the continuous line is an ungrouted portion that is not filled with grout; and A grout filling state determination system characterized by having a second determination unit that, when the first determination unit determines that the continuous line is the grout-unfilled portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel rod, and determines that the continuous line is the grout-unfilled portion when the brightness value of the continuous line is different from the brightness value of the base material and the brightness value of the PC steel rod.

7. A grout filling state determination method for determining a filling state of grout filled in a periphery of a PC steel rod embedded in a structure, comprising: an X-ray irradiation unit irradiating the structure with X-rays; a detector detecting x-rays transmitted through the structure; generating an X-ray transmission image of the structure based on the X-rays detected by the detector by an image generating unit; An image specifying unit specifies a PC steel rod image, which is an X-ray transmission image of the PC steel rod to be determined, from the X-ray transmission image; A step in which a determination unit determines a filling state of the grout based on the PC steel rod image, The step by the determination unit is a first determination unit determining that a predetermined color in the PC steel rod image is the base material of the structure and another predetermined color is the PC steel rod, and when a continuous line appears that is a color different from the color of the base material and the color of the PC steel rod and extends along the periphery of the PC steel rod, the first determination unit determines that the continuous line is an ungrouted portion that is not filled with grout; A grout filling state determination method characterized by having a step in which, when the first determination unit determines that the continuous line is the grout-unfilled portion, a second determination unit acquires the brightness values ​​of the continuous line, the base material, and the PC steel rod, and determines that the continuous line is the grout-unfilled portion when the brightness value of the continuous line is different from the brightness value of the base material and the brightness value of the PC steel rod.

8. A grout filling state determination program that causes a computer to execute a grout filling state determination method for determining the filling state of grout filled in the periphery of a PC steel rod embedded in a structure, A grout filling state determination program for causing the computer to execute the grout filling state determination method according to claim 7.

Images