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

Abstract

This invention provides a grout filling state determination device, system, determination method, and program that can accurately determine the filling state of grout that is filled into the periphery of PC steel bars. [Solution] This grout filling state determination device 10 includes 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 includes a first determination unit 81 that determines a continuous line 7 is an unfilled grouted portion when a continuous line 7 extending along the periphery of the PC steel bar 3 occurs in a color different from the color of the base material 2 and the PC steel bar 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 bar 3, and determines a continuous line 7 is an unfilled grouted portion when the brightness value of the continuous line 7 is different from the brightness values ​​of the base material 2 and the PC steel bar 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 bar embedded in a structure.

Background Art

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

[0003] This PC steel bar is inserted into a tubular sheath, and a mortar-like filling material called grout is filled in the gap between the outer periphery of the PC steel bar and the inner periphery of the sheath, and the peripheral portion of the PC steel bar is covered with grout. In this case, since the grout is filled in the gap, it becomes difficult for moisture to penetrate into the gap, and the possibility of rust formation on the PC steel bar is low.

[0004] However, when the filling of the grout into the gap is insufficient or the like, moisture easily penetrates into the gap, and the possibility of rust formation on the PC steel bar increases. Therefore, the filling state of the grout has been determined.

[0005] For example, in Patent Document 1 below, an impact echo method is used in which elastic waves are input from the surface of a 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. A method for inspecting defects in a concrete structure is described.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] The defect inspection method described in Patent Document 1 above is an impact echo method inspection, which indirectly inspects for defects from the response waveform of elastic waves, and does not allow for 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, the 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 in the peripheral edge of a PC steel bar. [Means for solving the problem]

[0009] To achieve the above objective, one aspect of the present invention is: A grout filling state determination device for determining the filling state of grout that is filled into the peripheral edge of a PC steel bar embedded in a structure, The structure includes an X-ray irradiation unit that irradiates the structure with X-rays, A detector for detecting X-rays that have passed through the aforementioned structure, An image generation unit that generates an X-ray transmission image of the structure based on the X-rays detected by the detector, An image identification unit identifies the PC steel bar image, which is the X-ray transmission image of the PC steel bar to be determined, from the aforementioned X-ray transmission image. It includes a determination unit that determines the filling state of the grout based on the PC steel bar image, The determination unit includes a first determination unit which determines that a predetermined color in the PC steel bar image represents the base material (concrete, etc.) of the structure, and another predetermined color represents the PC steel bar, and when a continuous line extending along the periphery of the PC steel bar occurs in a color different from the base material color and the PC steel bar color, the continuous line is an unfilled portion where grout has not been filled. The invention is characterized by having a second determination unit that, when the first determination unit determines that the continuous line is the unfilled grout portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel bar, and determines that the continuous line is the unfilled grout 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 bar.

[0010] In X-ray transmission images, areas with low X-ray absorption are more easily penetrated, so areas with low X-ray absorption usually appear white (and if the X-ray transmission image is inverted to black and white, it will appear black). Therefore, if there is a void at the periphery of the PC steel bar, the void will appear white because it is more easily penetrated by X-rays.

[0011] Furthermore, because grout is a low-viscosity liquid, it extends continuously along the periphery of the PC steel bar. Since the X-ray absorption of grout does not differ significantly from that of the base material of the structure or the PC steel bar, when grout extends along the periphery of the PC steel bar, the grout appears visually indistinguishable from the base material or the periphery of the PC steel bar in the X-ray transmission image.

[0012] Therefore, if grout is not filled in the peripheral edge of the PC steel bar and a void exists, as mentioned above, the void is easily permeable to X-rays, resulting in a continuous line extending along the peripheral edge of the PC steel bar. This continuous line can then be identified as an ungrouted portion where grout has not been filled.

[0013] Furthermore, in the grout filling state determination device of the present invention, the presence or absence of grout filling at the periphery of the PC steel bar is determined by two determination units, a first determination unit and a second determination unit. However, if the determination is made by the first determination unit alone, it will depend solely on the X-ray transmission image, and therefore the determination accuracy may be insufficient due to various factors such as the on-site environment including the weather when the X-ray transmission image is taken, the setting position and orientation of the device, and the thickness of the structure.

[0014] In this regard, the grout filling state determination device of the present invention first determines the presence or absence of unfilled grout portions based on the presence or absence of continuous lines extending along the periphery of the PC steel bar (based on the X-ray transmission image, the continuous lines along the periphery of the PC steel bar are identified as unfilled grout portions), and then the second determination unit determines that the continuous lines are unfilled grout portions when the brightness value of the continuous lines differs from the brightness value of the base material or the PC steel bar (the brightness value is quantified and evaluated). In this two-stage determination process, the continuous lines extending along the periphery of the PC steel bar are determined to be unfilled grout portions.

[0015] In other words, a continuous line extending along the periphery of a PC steel bar is not determined as an unfilled grout area by the first determination unit alone. It is only determined as an unfilled grout area by the second determination unit based on its brightness value, thus enabling accurate determination of whether or not grout is filled in the periphery of the PC steel bar.

[0016] In the grout filling state determination device of the present invention, The second determination unit creates a graph in which the brightness values ​​of the base material and the continuous lines in the PC steel bar image and its surrounding area are used as the vertical axis, and the width of the portion corresponding to the vertical axis in the PC steel bar image and its surrounding area is used as the horizontal axis, The graph may also be configured to determine the portion corresponding to the peak value on the vertical axis as the portion that is not filled with grout.

[0017] According to the above embodiment, the second determination unit configured as described above determines whether or not grout is filled at the periphery of the PC steel bar based on a graph based on brightness values ​​and the portion corresponding to the peak value on the vertical axis of the graph. In this case, when a peak value occurs on the vertical axis of the graph, the difference in brightness values ​​between the base material and the grout-free portion in the PC steel bar image becomes clear, thereby further improving the accuracy of determining whether or not grout is filled at the periphery of the PC steel bar.

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

[0019] According to the above aspect, since the image specifying unit has the above configuration, it is possible to surely specify the PC steel bar to be determined from a plurality of PC steel bars existing in the X-ray transmission image.

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

[0021] According to the above aspect, not only the first and second determination units, but also three determination units including the third determination unit that determines the grout unfilled portion based on the luminance ratio X can determine the presence or absence of the grout filled portion at the peripheral portion of the PC steel bar. Therefore, the determination accuracy of the presence or absence of grout filling at the peripheral portion of the PC steel bar can be further improved.

[0022] In the grout filling state determination device of the present invention, the third determination unit determines that the grout is filled in the peripheral portion of the PC steel bar when the luminance ratio X is less than 5%, determines that there may be a grout unfilled portion in the peripheral portion of the PC steel bar when the luminance ratio X is 5% or more and less than 10%, and may be configured to determine that the possibility of the presence of the grout unfilled portion in the peripheral portion of the PC steel bar is higher when the luminance ratio X is 10% or more than when it is 5% or more and less than 10%.

[0023] According to the above embodiment, since the third determination unit has the above configuration, the reliability and certainty of the determination accuracy of the third determination unit regarding the presence or absence of grout filling at the peripheral edge of the PC steel bar can be improved.

[0024] Another aspect of this invention is, A grout filling state determination system for determining the filling state of grout that is filled into the periphery of PC steel bars 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 transmitting unit that transmits the X-ray data detected by the detector, An image generation unit that generates an X-ray transmission image of the structure based on the aforementioned X-ray data, An image identification unit identifies the PC steel bar image, which is the X-ray transmission image of the PC steel bar to be determined, from the aforementioned X-ray transmission image. It includes a determination unit that determines the filling state of the grout based on the PC steel bar image, The determination unit, A first determination unit determines that a predetermined color in the PC steel bar image represents the base material of the structure, and another predetermined color represents the PC steel bar, and when a continuous line extends along the periphery of the PC steel bar in a color different from the base material color and the PC steel bar color, the continuous line represents an unfilled portion where the grout has not been filled. The invention is characterized by having a second determination unit that, when the first determination unit determines that the continuous line is the unfilled grout portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel bar, and determines that the continuous line is the unfilled grout 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 bar.

[0025] Another aspect of the present invention is, A method for determining the grout filling state for determining the filling state of grout that is filled in the peripheral edge of PC steel bars embedded in a structure, The steps include: an X-ray irradiation unit irradiating the structure with X-rays, The steps include: detecting X-rays that have passed through the structure using a detector; The steps include: generating an X-ray transmission image of the structure based on the X-rays detected by the detector in the image generation unit; The image identification unit identifies the PC steel bar image, which is the X-ray transmission image of the PC steel bar to be determined, from the X-ray transmission image. The determination unit includes the step of determining the filling state of the grout based on the PC steel bar image, The steps performed by the determination unit are: The first determination unit determines that a predetermined color in the PC steel bar image represents the base material of the structure, and another predetermined color represents the PC steel bar, and when a continuous line extends along the periphery of the PC steel bar in a color different from the base material color and the PC steel bar color, it determines that the continuous line is an unfilled portion where the grout has not been filled. The second determination unit, when the first determination unit determines that the continuous line is the unfilled grout portion, acquires the brightness values ​​of the continuous line, the base material, and the PC steel bar, and determines that the continuous line is the unfilled grout 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 bar.

[0026] 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 that is filled in the periphery of PC steel bars embedded in a structure, The method is characterized by causing the computer to execute the grout filling state determination method. [Effects of the Invention]

[0027] According to the present invention, a continuous line extending along the periphery of a PC steel bar is not determined to be an unfilled grout portion by the first determination unit alone. It is only determined to be an unfilled grout portion by the second determination unit based on its brightness value. Therefore, the presence or absence of grout filling at the periphery of the PC steel bar can be determined with high accuracy. [Brief explanation of the drawing]

[0028] [Figure 1] This diagram shows one embodiment of the grout filling state determination device according to the present invention, and is a schematic configuration diagram thereof. [Figure 2] This is an X-ray transmission image showing the presence of grout around the periphery of a PC steel bar. [Figure 3] This is an X-ray transmission image of a PC steel bar with no grout present at its periphery. [Figure 4] This is a schematic diagram illustrating the irradiation state from the X-ray irradiation unit to the structure. [Figure 5] This is an explanatory diagram showing an example of a simulated figure. [Figure 6] This flowchart shows the process for identifying the PC steel bar to be evaluated from an X-ray transmission image. [Figure 7] This graph, created by the second judgment unit, has the measurement width W1 on the horizontal axis and the brightness value on the vertical axis. [Figure 8] This is a magnified X-ray transmission image of a key area when there is an unfilled grouted portion at the periphery of a PC steel bar. [Figure 9] This is an explanatory diagram showing how to calculate the voids in the grout-unfilled areas, with the horizontal axis representing the measurement width W1 and the vertical axis representing the brightness value. [Figure 10] This is an error bar graph with concrete thickness W2 on the horizontal axis and luminance ratio X on the vertical axis. [Figure 11] This flowchart shows the process of determining whether or not there are any unfilled grouted areas by the determination unit. [Figure 12] This diagram shows one embodiment of the grout filling state determination system according to the present invention, and is a schematic configuration diagram thereof. [Modes for carrying out the invention]

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

[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 that is filled into the peripheral edge (outer peripheral edge located radially outward) of the PC steel bar 3 embedded in the structure 1.

[0031] The aforementioned structure 1 is made of prestressed concrete (PC), with the concrete portion other than the PC steel bars 3 forming the base material 2. PC steel bars 3, extending to a predetermined length and having a predetermined outer diameter, are embedded in this base material 2. Furthermore, multiple reinforcing bars 5, in addition to the PC steel bars 3, are also embedded in the base material 2. The reinforcing bars 5 are shown in Figure 4, etc.

[0032] Furthermore, as shown in Figure 9, the PC steel bar 3 is inserted inside the tubular sheath 4, and the gap between the outer circumference of the PC steel bar 3 and the inner circumference of the sheath 4 is filled with grout, which is a mortar-based filler.

[0033] As shown in Figure 1, the determination device 10 mainly consists of an X-ray irradiation unit 20 that irradiates the structure 1 with X-rays, 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 determine the grout filling state at the periphery of the PC steel bar 3, and a display unit 45 that displays the processing results from the processing unit 40.

[0034] Furthermore, the processing unit 40 includes 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 bar image, which is an X-ray transmission image of the PC steel bar 3 to be determined, from the X-ray transmission image, and a determination unit 80 that determines the grout filling state based on the PC steel bar image.

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

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

[0037] Furthermore, the processing unit 40 is connected to the detector 30 by a cable or the like, and the X-ray data detected by the detector 30 is transmitted to the processing unit 40. In addition, the processing unit 40 may be equipped with 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 integrated with the processing unit 40, or a display for a mobile device terminal, and is connected to the image generation unit 50 and the image identification unit 60 by cables, wireless communication means, etc.

[0039] The X-ray irradiation unit 20 is held in a movable position by an operating mechanism 21 that operates using a ball screw, worm gear, cam mechanism, etc.

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

[0041] Furthermore, structure 1 is positioned so as to be sandwiched between the X-ray irradiation unit 20 and the detector 30. When the X-ray irradiation unit 20 irradiates structure 1 with X-rays, the X-rays pass through structure 1, and the detector 30 detects the transmitted X-rays. Note that the X-rays are irradiated in a radial projection range from the X-ray irradiation unit 20, that is, as shown in Figure 4, the irradiation range gradually widens toward the detector 30 relative to the aiming point (irradiation center L) of the X-ray irradiation unit 20.

[0042] The image generation unit 50 converts the X-ray information after transmission from the X-rays detected by the detector 30, that is, 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. That is, it converts the X-ray data into an electrical signal, then quantizes it for example with 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 transmission images. Figure 2 shows an X-ray transmission image of the PC steel bar 3 with grout present at its periphery, while Figure 3 shows an X-ray transmission image of the PC steel bar 3 without grout at its periphery.

[0044] In Figures 2 and 3, areas with high X-ray absorption, such as the base material 2 of structure 1 and the PC steel bars 3, appear black or nearly black (gray, etc.), while areas with low X-ray absorption, such as voids where grout is absent, appear white. (Note that if the X-ray transmission image is inverted to black and white, the opposite occurs: areas with low X-ray absorption appear black or nearly black, and areas with high X-ray absorption appear white.) The reason for this is as follows.

[0045] In other words, the grout-unfilled portions are voids as described above, and since moisture is present in these voids, the density of these voids and moisture is very small compared to the concrete, which is the base material 2 of the structure 1, the main body of the PC steel bar 3, and the reinforcing bars 5. Therefore, X-rays easily penetrate the voids, and they appear white in X-ray transmission images.

[0046] On the other hand, the concrete, which is the base material 2 of the structure 1, the main body of the PC steel bar 3, and the reinforcing bars 5 are prone to absorbing X-rays, and therefore appear as black or a color close to black in X-ray transmission images.

[0047] The image identification unit 60 identifies the PC steel bar image, which is the image of the PC steel bar 3 to be determined, from the X-ray transmission image generated by the image generation unit 50. That is, since multiple PC steel bars 3 as well as multiple reinforcing bars 5 are embedded in the base material 2 of the structure 1, the base material 2, PC steel bars 3, and reinforcing bars 5 will be visible in the X-ray transmission image, as shown in Figures 2 and 3. Therefore, the PC steel bar 3 to be determined is identified from the X-ray transmission image.

[0048] Furthermore, 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. The simulated figure creation unit 70 is configured to identify the PC steel bar image that is the target for determining the grout filling state from among the multiple simulated figures.

[0049] In other words, 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 (or coordinates) of the PC steel bar 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 the X-rays are irradiated from the X-ray irradiation unit 20 in a radial projection range (see Figure 4), the shape and dimensions in the X-ray transmission image will change depending on the embedded position of the PC steel bar 3 and reinforcing bars 5, as well as the positions of the X-ray irradiation unit 20 and the detector 30.

[0051] Furthermore, while the X-ray transmission image is displayed as a two-dimensional image of white and black, the contrast between black and white becomes fainter the closer the PC steel bars 3 and reinforcing bars 5 are to the X-ray irradiation unit 20, which is the X-ray source. This is because scattering noise from the concrete, which is the base material 2 of the structure 1, dilutes the darker areas in the X-ray transmission image.

[0052] As described above, the dimensions and density of the PC steel bar images and reinforcing bar images in the X-ray transmission images make it possible to determine the position of a specific PC steel bar 3 within the base material 2 of the structure 1.

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

[0054] Furthermore, when PC steel bars 3 and reinforcing bars 5 are modeled in a spiral shape, the maximum outer diameter dimension of the spiral shape, that is, the width between the maximum value (left end of the spiral shape in Figure 5) and the minimum value (right end of the spiral shape in Figure 5) of the spiral curve, becomes the outer diameter of PC steel bars 3 and reinforcing bars 5.

[0055] By the way, the simulated figures described above have the following implications. Specifically, within the range of the X-ray transmission images shown in Figures 2 and 3, the PC steel bar images and reinforcing bar images overlap and become difficult to distinguish from each other, and in particular, the boundaries of the outer edges of the PC steel bar 3 and reinforcing bar 5 become difficult to discern. Here, by modeling the PC steel bar images and reinforcing bar images into a predetermined shape that is simpler than the actual X-ray transmission images, the outer edges of the PC steel bar 3, etc., can be clarified, and their outer diameter dimensions can be easily determined.

[0056] Furthermore, the outer diameters of the PC steel bars 3 and reinforcing bars 5 embedded within the base material 2 of the structure 1 can usually be determined in advance from the design drawings of the structure 1 at the time of its construction. Therefore, the positional relationship between the X-ray irradiation unit 20 and the detector 30 makes it possible to determine the exact location of the PC steel bars 3 and reinforcing bars 5 embedded within the base material 2 of the structure 1. Consequently, it is possible to identify which image in the X-ray transmission images shown in Figures 2 and 3 represents the PC steel bar 3 being analyzed.

[0057] Furthermore, the simulated figure generation unit 70 in this embodiment is configured to display the generated simulated figures as multiple visible images on the display unit 45. In this case, the display unit 45 displays the first simulated figure 71, the second simulated figure 72, and the third simulated figure 73 in order from top to bottom.

[0058] In other words, the simulated figure creation unit 70 models the PC steel bar image of PC steel bar 3 and the reinforcing bar image of 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 the first simulated figure 71 on the upper screen 1 of the display unit 45 (see Figures 1 and 5). As described above, the outer diameter of the PC steel bar 3 and reinforcing bar 5 can be determined by the width between the maximum and minimum values ​​of the spiral curve.

[0059] Furthermore, the simulated figure generation unit 70 displays the PC steel bar image of PC steel bar 3 and the reinforcing bar image of reinforcing bar 5 within the range of the X-ray transmission image in predetermined stages of shading corresponding to their layout within the base material 2 of the structure 1 (here, it is displayed in 10 stages, becoming lighter closer to the X-ray irradiation unit 20 and darker further away). This shading display is then displayed as the second simulated figure 72 on the middle screen 2 of the display unit 45 (see Figures 1 and 5). In other words, the layout of the PC steel bar 3 and reinforcing bar 5 in the depth direction of the base material 2 of the structure 1 can be grasped.

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

[0061] Furthermore, the simulated figure creation unit 70 matches (fits) the data of PC steel bars 3 and reinforcing bars 5 obtained from the design drawings of the structure 1 at the time of its construction, as well as the various simulated figures 71, 72, and 73 displayed on the display unit 45, to the X-ray transmission image generated by the image generation unit 50, in order to identify the PC steel bar 3 to be judged.

[0062] The specific process for identifying the PC steel bar 3 to be judged from the X-ray transmission image described above will be explained in detail later in the section describing the grout filling judgment method, along with Figure 6.

[0063] Next, we will describe in detail the determination unit 80, which determines the grout filling state based on the PC steel bar image.

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

[0065] The first determination unit 81 determines that a predetermined color in the PC steel bar image represents the base material 2 of the structure 1, and another predetermined color represents the PC steel bar 3. When a continuous line 7 (see Figures 1 and 3) extends along the periphery of the PC steel bar 3 and is a different color from the base material 2 and the PC steel bar 3, the first determination unit 81 determines that the continuous line 7 is an unfilled portion where grout has not been applied.

[0066] As shown in Figure 3, if there is an ungrouted portion at the periphery of the PC steel bar 3, as described above, this ungrouted portion is a void, and X-rays can easily pass through it, so a continuous line 7 extending along the periphery of the PC steel bar 3 will be visible. Therefore, if this continuous line 7 appears at the periphery of the PC steel bar 3 being judged, it is determined that there is likely an ungrouted portion at the periphery of the PC steel bar 3.

[0067] On the other hand, when the first determination unit 81 determines that the continuous line 7 is an unfilled grouted portion, the second determination unit 82 obtains the brightness value of the continuous line 7, the base material 2, and the PC steel bar 3, and determines that the continuous line 7 is an unfilled grouted 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 bar 3.

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

[0069] Specifically, the second determination unit 82 first acquires the brightness values ​​of the continuous line 7, the base material 2, and the PC steel bar 3, and then determines that the continuous line 7 is an unfilled grouted portion when the brightness value of the continuous line 7 is different from the brightness values ​​of the base material 2 and the PC steel bar 3.

[0070] Furthermore, the second determination unit 82 creates a graph in which the brightness values ​​of the base material 2 and continuous line 7 in the PC steel bar image and its surrounding area are used as the vertical axis, and the width W of the portion corresponding to the vertical axis in the PC steel bar image and its surrounding area is used as the horizontal axis. The unit is configured to determine that the portion corresponding to the peak value on the vertical axis of the graph is a portion that has not been filled with grout.

[0071] Figure 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. Figure 8 shows a magnified X-ray transmission image of a key area when there is an unfilled grout portion at the periphery of the PC steel bar 3. The second determination unit 82 then creates the graph shown in Figure 7 mainly from the area enclosed by the frame in Figure 8.

[0072] Figure 7 shows both the average luminance value graph K1, which is created by plotting the average luminance values, and the graph K2, which consists of the absolute value of the first derivative, i.e., the graph created by differentiating the average luminance value graph K1. The peak value in the graph K2 can be clearly identified.

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

[0074] In other words, while the absolute first derivative of the luminance value of base material 2 does not show a high peak value in graph K2, the absolute first derivative of the luminance value of continuous line 7 shows a remarkably 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 continuous line 7, and consequently, the presence or absence of unfilled grout areas.

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

[0076]

number

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

number

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

number

[0079] The third determination unit 83 determines the portion of the grout that is not filled, based on the luminance ratio X calculated as ((B / A)-1)×100(%), where A is the luminance value of the base material 2 determined by the second determination unit 82, and B is the luminance value of the continuous line 7.

[0080] In other words, although the brightness value "la" of continuous line 7 can be calculated using the above formula (3), it tends to differ somewhat from the brightness value of continuous line 7 in the actual X-ray transmission image (the brightness value of continuous line 7 in the 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 areas where grout has not been filled are determined based on the brightness ratio X calculated by taking into account not only the brightness value B of 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 area of ​​the PC steel bar 3 when the luminance ratio X is less than 5%, to determine that there is a possibility that there is an unfilled portion of the PC steel bar 3 when the luminance ratio X is 5% or more but less than 10%, and to determine that the possibility of an unfilled portion of the PC steel bar 3 being present is higher than when the luminance ratio X is 10% or more but less than 10%.

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

[0083] As shown in Figure 10, the luminance ratio X tends to decrease as the thickness of the base material 2 (concrete thickness W2) increases. This is thought to be due to the increase in scattering noise caused by the base material 2, such as concrete, which distorts the waveform of the luminance value (causing a slope in the rising edge of the waveform or a decrease in amplitude). The standard deviation σ is also considered in relation to the luminance ratio X.

[0084] As shown in Figure 10, if the luminance ratio X is less than 5%, it is determined that grout is filled in the periphery of the PC steel bar 3. If the luminance ratio X is 5% or more but less than 10%, it is determined that there is a possibility that there is an ungrouted area in the periphery of the PC steel bar 3. Furthermore, if the luminance ratio X is 10% or more, it is determined that the possibility of an ungrouted area in the periphery of the PC steel bar 3 is higher than when it is 5% or more but less than 10%. In this way, the presence or absence of an ungrouted area is determined in three stages using the luminance ratio X as a threshold.

[0085] The specific process of the determination by the determination unit 80 described above will be explained in detail in the section describing the grout filling determination method, along with Figure 11, which will be discussed later.

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

[0087] This grout filling state determination method (hereinafter also simply referred to as the "determination method") includes the steps of: an X-ray irradiation unit 20 irradiating the structure 1 with X-rays; 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 the PC steel bar image of the PC steel bar 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 bar image.

[0088] First, the process of identifying the PC steel bar 3 to be judged will be described in detail with reference to Figure 6. To begin with, (1) the coordinates of the X-ray irradiation unit 20 are input, that is, the position of the X-ray irradiation unit 20 relative to the structure 1 in which the PC steel bar 3 to be judged is embedded is input to the processing unit 40, (2) the coordinates of the detector 30 are input, that is, the position of the detector 30 relative to the structure 1 is input to the processing unit 40, and (3) the coordinates and diameter of the PC steel bar 3 are input, that is, the position and diameter of the PC steel bar 3 to be judged relative to the structure 1 are input to 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 focal point of the X-ray irradiation unit 20 to the detector 30 (STEP 1).

[0090] Next, the tilt angle of the X-ray irradiation unit 20 is input to the processing unit 40 (STEP 2). Then, the processing unit 40 calculates the positional relationship between the X-ray irradiation unit 20, the detector 30, the aiming of the X-ray irradiation unit 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 X-ray transmission images of the base material 2, PC steel bars 3, and reinforcing bars 5 of the structure 1. At the same time, the X-ray irradiation unit 20, the detector 30, the aiming point of the X-ray irradiation unit 20, and the projection range of the X-ray transmission image are displayed on a plan view output screen (not shown) (STEP 4).

[0092] Furthermore, the image generation unit 50 displays the PC steel bar 3 on the plan view output screen with the diameter entered in (3) above (STEP 5).

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

[0094] Subsequently, the simulated figure creation unit 70 models the PC steel bars 3 within the range of the X-ray transmission image (projection range) into a predetermined shape (helical shape in this case) (see Figure 5), and displays this as the first simulated figure 71 on the upper screen 1 of the display unit 45. The reinforcing bars 5 within the projection range are also modeled and displayed on the display unit 45.

[0095] Simultaneously, the simulated figure generation unit 70 applies a shading process to the PC steel bars 3 within the projection range and displays this shading as the second simulated figure 72 on the middle screen 2 of the display unit 45. The reinforcing bars 5 within the projection range are also processed with shading and displayed on the display unit 45.

[0096] Furthermore, the simulated figure creation unit 70 extracts only the PC steel bar 3 to be judged from the data of PC steel bars 3 and reinforcing bars 5 obtained from the design drawings of the structure 1 at the time of construction, the first simulated figure 71, and the second simulated figure 72, and displays its modeled shape as the 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). The simulated figure creation unit 70 then matches the data of the PC steel bars 3 and reinforcing bars 5 obtained from the design drawings of the structure 1 at the time of its construction, as well as the various simulated figures 71, 72, and 73 displayed on the display unit 45, with the X-ray transmission image generated by the image generation unit 50 to identify the PC steel bar 3 to be judged (STEP 8).

[0098] Furthermore, the steps performed by the determination unit 80 include the first determination unit 81 determining that a predetermined color in the PC steel bar image represents the base material 2 of the structure 1, and another predetermined color represents the PC steel bar 3, and when a continuous line 7 extending along the periphery of the PC steel bar 3 is found to be a color different from the color of the base material 2 and the color of the PC steel bar 3, the second determination unit 82 determining that the continuous line 7 is an ungrouted portion where grout has not been filled, when the first determination unit 81 has determined that the continuous line 7 is an ungrouted portion, and the second determination unit 82 obtaining the brightness values ​​of the continuous line 7, the base material 2, and the PC steel bar 3, and determining that the continuous line 7 is 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 bar 3.

[0099] Referring to Figure 11, the specific steps for determining the presence or absence of unfilled grout sections by the determination unit 80 will be described in detail. Note that the steps up to the step of identifying the PC steel bar 3 to be determined (STEP 24 below) are included in Figure 11 as they are preparatory steps for the determination process by the determination unit 80.

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

[0101] Next, the PC steel bar 3 to be determined is identified from the multiple PC steel bar images (STEP 22). If it is not possible to identify the PC steel bar 3 to be determined from the multiple PC steel bars, the determination of the PC steel bar 3 is deemed impossible (STEP 23), and the determination process by the determination unit 80 to determine the presence or absence of unfilled grout portions ends.

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

[0103] Next, the first determination unit 81 determines whether or not there is a continuous line 7 on the peripheral edge of the PC steel bar 3 (STEP 25). If the first determination unit 81 determines that there is a continuous line 7 on the peripheral edge of the PC steel bar 3, the process proceeds to STEP 26.

[0104] On the other hand, if the first determination unit 81 determines that there is no continuous line 7 on the periphery of the PC steel bar 3, the determination unit 80 determines that there is no unfilled grout portion on the periphery of the PC steel bar 3 being determined (STEP 29), and the determination unit 80's process of determining the presence or absence of an unfilled grout portion is completed.

[0105] Next, the second determination 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 bar 3 to determine whether there is a difference (STEP 26). That is, if the first determination unit 81 determines that there is a difference between the brightness value of the continuous line 7 and the brightness value of the base material 2 and the brightness value of the PC steel bar 3, the process proceeds to STEP 27.

[0106] On the other hand, if the second determination 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 bar 3, the determination unit 80 determines that there are no unfilled grout portions around the periphery of the PC steel bar 3 being determined (STEP 29), and the determination unit 80's process of determining the presence or absence of unfilled grout portions ends.

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

[0108] If the second determination unit 82 detects a peak value in the graph, the process proceeds to STEP 28. On the other hand, if the second determination unit 82 does not detect a peak value in the graph, the determination unit 80 determines that there are no unfilled grout areas around the periphery of the PC steel bar 3 being judged (STEP 29), and the determination unit 80's process of determining the presence or absence of unfilled grout areas ends.

[0109] Next, the third determination unit 83 determines whether or not there are any unfilled grout areas based on the luminance ratio X (STEP 28).

[0110] Then, the third determination unit 83 determines that grout is filled in the peripheral area of ​​the PC steel bar 3 if the luminance ratio X is less than 5%, that is, it determines that there are no unfilled grout areas in the peripheral area of ​​the PC steel bar 3 being determined (STEP 29), and the determination unit 80's process of determining the presence or absence of unfilled grout areas ends.

[0111] Furthermore, the third determination unit 83 determines that there is a possibility of an unfilled grout area on the periphery of the PC steel bar 3 if the luminance ratio X is 5% or more and less than 10% (STEP 30), and the determination unit 80's process of determining the presence or absence of an unfilled grout area is completed.

[0112] Furthermore, the third determination unit 83 determines that when the luminance ratio X is 10% or more, the possibility of an unfilled grout portion existing around the periphery of the PC steel bar 3 is higher than when it is 5% or more but less than 10% (STEP 31), and the determination unit 80's process of determining the presence or absence of an unfilled grout portion is completed.

[0113] (Effects and Benefits) Next, the effects and benefits of the determination device 10, which has the above configuration, will be explained.

[0114] In other words, the determination device 10 has a determination unit 80 which includes a first determination unit 81 and a second determination unit 82 with the configuration described above. First, the first determination unit 81 determines the presence or absence of unfilled grout portions based on the presence or absence of continuous lines 7 extending along the periphery of the PC steel bar 3. That is, based on the X-ray transmission image, it identifies the continuous lines 7 along the periphery of the PC steel bar 3 as unfilled grout portions.

[0115] Subsequently, the second determination unit 82 determines that the continuous line 7 is an unfilled grouted portion if its brightness value differs from that of the base material 2 or the PC steel bar 3. In other words, it quantifies and evaluates the brightness value.

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

[0117] In other words, the continuous line 7 extending along the periphery of the PC steel bar 3 is not determined to be an unfilled grout portion by the first determination unit 81 alone, but is determined to be an unfilled grout portion only after being determined by the second determination unit 82 based on the brightness value. Therefore, the presence or absence of grout filling at the periphery of the PC steel bar 3 can be determined with high accuracy.

[0118] Furthermore, in the determination device 10 of this embodiment, the second determination unit 82 creates a graph in which the brightness values ​​of the base material 2 and continuous line 7 in the PC steel bar image and its surrounding area are used as the vertical axis, and the width of the portion corresponding to the vertical axis in the PC steel bar image and its surrounding area is used as the horizontal axis (see Figure 7), and determines that the portion corresponding to the peak value on the vertical axis of the graph is an unfilled grout portion.

[0119] According to the above embodiment, the second determination unit 82 configured as described above determines whether or not grout is filled at the periphery of the PC steel bar 3 based on a graph based on brightness values ​​and the portion corresponding to the peak value on the vertical axis of the graph. In this case, when a peak value occurs on the vertical axis of the graph, the difference in brightness values ​​between the base material 2 and the grout-unfilled portion in the PC steel bar image becomes clear, thereby further improving the accuracy of determining whether or not grout is filled at the periphery of the PC steel bar 3.

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

[0121] According to the above embodiment, since the image identification unit 60 has the above configuration, it is possible to reliably identify the PC steel bar 3 to be determined from among the multiple PC steel bars 3 present in the X-ray transmission image.

[0122] Furthermore, in the determination device 10 of this embodiment, the determination unit 80 has a third determination unit 83 that determines the portion of the grout that is not filled, based on the luminance ratio X calculated as ((B / A)-1)×100(%), where A is the luminance value of the base material 2 determined by the second determination unit 82 and B is the luminance value of the continuous line 7.

[0123] According to the above embodiment, the presence or absence of grout-filled portions at the periphery of the PC steel bar 3 can be determined not only by the first determination unit 81 and the second determination unit 82, but also by the three determination units 81, 82, and 83, including the third determination unit 83 which determines the grout-unfilled portion based on the luminance ratio X. Therefore, the accuracy of determining the presence or absence of grout filling at the periphery of the PC steel bar 3 can be further improved.

[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 edge of the PC steel bar 3 when the luminance ratio X is less than 5%, to determine that there is a possibility that there is an unfilled portion of the PC steel bar 3 when the luminance ratio X is 5% or more and less than 10%, and to determine that the possibility of an unfilled portion of the PC steel bar 3 being present is higher than the case when the luminance ratio X is 10% or more and less than 10%.

[0125] According to the above embodiment, since the third determination unit 83 has the above configuration, the reliability and certainty of the determination accuracy of the third determination unit 83 regarding the presence or absence of grout filling at the peripheral edge of the PC steel bar 3 can be improved.

[0126] (An embodiment of a grout filling state determination system) Figure 12 illustrates the grout filling state determination system according to the present invention. Parts substantially identical to the determination device 10 are denoted by the same reference numerals, and their descriptions are omitted.

[0127] As shown in Figure 12, the grout filling state determination system 100 in this embodiment (hereinafter also simply referred to as "determination system 100") includes an X-ray irradiation unit 20, a detector 30, a transmitting 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] Furthermore, the processing unit 40 has a receiving unit (not shown) that receives X-ray data from the transmitting unit 35. The receiving unit of the processing unit 40 and the transmitting unit 35 are connected by a well-known wireless communication or network line. The X-ray data transmitted from the transmitting unit 35 may be stored and managed on a server or the like.

[0129] In other words, a predetermined part of the processing unit 40 may be configured by a predetermined server. In this case, any other part of the processing unit 40 may be configured by a different server. To put it another way, the grout filling state determination system of the present invention may have its processing unit configured by one or more servers.

[0130] Furthermore, the same effect as the determination device 10 can be obtained with the determination system 100 described above.

[0131] (Grout filling status determination program) Furthermore, the present invention 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 that is filled in the peripheral edge of a PC steel bar embedded in a structure 1, and the program includes a grout filling state determination program that causes a computer to execute a grout filling state determination method.

[0132] It should be noted that the present invention is not limited to the embodiments described above, 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 bar, 5...Reinforcement, 7...Continuous line, 10...Grout filling state 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 that is filled into the peripheral edge of a PC steel bar embedded in a structure, The structure includes an X-ray irradiation unit that irradiates the structure with X-rays, A detector for detecting X-rays that have passed through the aforementioned structure, An image generation unit that generates an X-ray transmission image of the structure based on the X-rays detected by the detector, An image identification unit identifies the PC steel bar image, which is the X-ray transmission image of the PC steel bar to be determined, from the aforementioned X-ray transmission image. It has a determination unit that determines the filling state of the grout based on the PC steel bar image, The determination unit, A first determination unit determines that a predetermined color in the PC steel bar image represents the base material of the structure, and another predetermined color represents the PC steel bar, and when a continuous line extends along the periphery of the PC steel bar in a color different from the base material color and the PC steel bar color, the continuous line represents an unfilled portion where the grout has not been filled. 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 bar, 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 bar.

2. The second determination unit described above is: A graph is created in which the brightness values ​​of the base material and the continuous lines in the PC steel bar image and its surrounding area are used as the vertical axis, and the width of the portion corresponding to the vertical axis in the PC steel bar image and its surrounding area is used as the horizontal axis. The grout filling state determination device according to claim 1, wherein the portion corresponding to the peak value on the vertical axis of the graph is determined to be the portion that is not filled with grout.

3. The aforementioned image identification unit is The grout filling state determination device according to claim 1 or 2, further comprising a simulated figure production unit that produces a predetermined shape of simulated figures for a plurality of PC steel bars within the range of the X-ray transmission image, wherein the PC steel bar image to be determined is identified from the plurality of simulated figures produced by the simulated figure production unit.

4. The determination unit, A grout filling state determination device according to claim 1 or 2, further comprising a third determination unit that determines the unfilled portion of the grout based on a luminance ratio X calculated as ((B / A)-1) × 100 (%), where A is the luminance value of the base material determined by the second determination unit and B is the luminance value of the continuous line.

5. The aforementioned determination unit, If the luminance ratio X is less than 5%, it is determined that the grout is filled in the peripheral portion of the PC steel bar. If the luminance ratio X is 5% or more and less than 10%, it is determined that there is a possibility that the grout-unfilled portion exists at the periphery of the PC steel bar. The grout filling state determination device according to claim 4, configured to determine that when the luminance ratio X is 10% or more, the possibility of the presence of the unfilled grout portion at the periphery of the PC steel bar is higher than when it is 5% or more and less than 10%.

6. A grout filling state determination system for determining the filling state of grout that is filled into the periphery of PC steel bars embedded in a structure, The structure includes an X-ray irradiation unit that irradiates the structure with X-rays, A detector for detecting X-rays that have passed through the aforementioned structure, A transmitting unit that transmits X-ray data detected by the detector, An image generation unit that generates an X-ray transmission image of the structure based on the aforementioned X-ray data, An image identification unit identifies the PC steel bar image, which is the X-ray transmission image of the PC steel bar to be determined, from the aforementioned X-ray transmission image. It has a determination unit that determines the filling state of the grout based on the PC steel bar image, The determination unit, A first determination unit determines that a predetermined color in the PC steel bar image represents the base material of the structure, and another predetermined color represents the PC steel bar, and when a continuous line extends along the periphery of the PC steel bar in a color different from the base material color and the PC steel bar color, the continuous line represents an unfilled portion where the grout has not been filled. 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 bar, 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 bar.

7. A method for determining the grout filling state for determining the filling state of grout that is filled in the peripheral edge of PC steel bars embedded in a structure, The steps include: irradiating the structure with X-rays using an X-ray irradiation unit; The steps include: detecting X-rays that have passed through the structure using a detector; The steps include: generating an X-ray transmission image of the structure based on the X-rays detected by the detector in the image generation unit; The image identification unit identifies the PC steel bar image, which is the X-ray transmission image of the PC steel bar to be determined, from the X-ray transmission image. The determination unit includes the step of determining the filling state of the grout based on the PC steel bar image, The steps performed by the determination unit are: The first determination unit determines that a predetermined color in the PC steel bar image represents the base material of the structure, and another predetermined color represents the PC steel bar, and when a continuous line extends along the periphery of the PC steel bar in a color different from the base material color and the PC steel bar color, it determines that the continuous line represents an unfilled portion where grout has not been filled. A method for determining the grout filling state, characterized by having a second determination unit acquire the brightness values ​​of the continuous line, the base material, and the PC steel bar when the first determination unit determines that the continuous line is the grout-unfilled portion, and determining 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 bar.

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 that is filled in the periphery of PC steel bars embedded in a structure, A grout filling state determination program characterized by causing the computer to execute the grout filling state determination method described in claim 7.

Images