Photographing system and installation method

Abstract

To conduct an X-ray inspection for an underground portion of a reinforced concrete structure.SOLUTION: A method for installing a photographing system includes: digging, with high pressure water, a first hole in a vertical cylindrical shape in an area near the outer periphery of an underground portion (S110); digging, with high pressure water, a second hole in a groove shape substantially parallel to an outer peripheral surface of the underground portion at a position facing the first hole (S120); executing water-proof and dust-proof treatment on an X-ray irradiation device and subsequently inserting and installing the X-ray irradiation device into the first hole (S130); executing water-proof and dust-proof treatment on an X-ray detector and subsequently bending the X-ray detector in correspondence with the curvature of the groove of the second hole (S140); and inserting and installing the X-ray detector along the groove of the second hole (S150).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an imaging system capable of photographing the inside of a reinforced concrete structure, and to an installation method thereof. [Background technology]

[0002] Conventionally, a method has been proposed in which an X-ray transmission image of a utility pole is acquired and the deterioration state of reinforcing bars is diagnosed based on the X-ray transmission image (see, for example, Patent Document 1).In addition, as a non-destructive inspection method for performing non-destructive inspection of utility poles using X-rays, a method has been proposed in which a bendable, flexible imaging panel (X-ray detector) is employed to obtain a clear image even in the area near the edge of the X-ray transmission image (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-186121 A [Patent Document 2] JP 2020-003426 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in recent utility pole collapse accidents, there have been incidents of utility poles breaking at ground level, and since the area around the ground level is the part that is most required to maintain strength, there is an increasing need to inspect the underground portion of the utility pole. However, both the method disclosed in Patent Document 1 and the method disclosed in Patent Document 2 are premised on application to above-ground portions (see, for example, Figure 1 in Patent Document 1 and Figure 2 in Patent Document 2).

[0005] The present invention has been made against this background, and its object is to provide a method, etc. capable of performing X-ray inspection of underground portions of reinforced concrete structures. [Means for solving the problem]

[0006] A method according to a first means for achieving the above-mentioned object is a method for installing an imaging system (1) that uses X-rays to photograph a reinforced concrete structure (e.g., a utility pole 2), comprising the steps of forming a vertically elongated first hole (31) near the outer periphery of the underground portion (2b) and forming a groove-shaped second hole (32) approximately parallel to the outer periphery near the outer periphery of the underground portion (2b), the position of the first hole (31) being opposite the second hole (32) across the underground portion (2b), and further comprising the steps of installing an X-ray irradiation device (10) in the first hole (31) and installing a flexible X-ray detector (20) in the second hole (32).

[0007] In the first method, a plurality of first holes (31) may be formed, and an X-ray irradiation device (10) may be installed in each of them. In the first method, the first hole (31) and the second hole (32) may be drilled by high-pressure water. In the first method, the method further includes installing an X-ray shielding member (40) covering the first hole (31) and the second hole (32), and the X-ray shielding member (40) may be composed of a plurality of pieces (pieces 40a to 40d), and the plurality of pieces (pieces 40a to 40d) may be installed along the outer circumferential contour of the ground-level portion of the reinforced concrete structure 2.

[0008] In the first means, the X-ray detector (20) may have guide portions (pin guides 20a, 20a) at both ends (left end, right end) for guiding a fixing member (fixing pin 60), and the X-ray detector (20) may be installed in the second hole (32) by inserting the fixing member (fixing pin 60) guided by the guide portions (pin guides 20a, 20a) into the bottom surface of the second hole (32). In addition, when imaging the above-ground portion (2a) of the reinforced concrete structure (2), the method may further include installing the X-ray detector (20) on the above-ground portion (2a) by engaging the fixing member (fixing pin 60) guided by the guide portions (pin guides 20a, 20a) with an engaging member (50) attached around the above-ground portion (2a) of the reinforced concrete structure (2).

[0009] The system relating to the second means for achieving the above-mentioned object is an imaging system (1) for imaging a reinforced concrete structure (e.g., a utility pole 2) using X-rays, characterized in including an X-ray irradiation device (10) installed in a vertically long first hole (31) formed near the outer periphery of the underground part (2b) of the reinforced concrete structure (2), and a flexible X-ray detector (20) installed in a groove-shaped second hole (32) formed near the outer periphery of the underground part (2b) and approximately parallel to the outer periphery.

[0010] In the second means, a plurality of first holes (31) may be formed, and a plurality of X-ray irradiators (10) may be installed in the respective first holes (31). In the second means, the X-ray irradiator (10) may have a cylindrical housing (15) that covers the cold cathode X-ray tube, and the housing (15) may have an irradiation section (15a) for X-ray irradiation on a side surface, and an extraction section (wiring hole 152a) from which power lines (12a and 12b) of the DC / DC converter are extracted on one end (upper end 152). In the second means, the X-ray shielding member (40) may be comprised of a plurality of pieces (pieces 40a to 40d), and the plurality of pieces (pieces 40a to 40d) may be installed so as to cover the first hole (31) and the second hole (32) along the outer circumferential contour of the ground-level portion of the reinforced concrete structure (2).

[0011] In the second means, the X-ray detector (20) may have guide portions (pin guides 20a, 20a) at both ends for guiding a fixing member (fixing pin 60), and the fixing member (fixing pin 60) guided by the guide portions (pin guides 20a, 20a) may be inserted into the bottom surface of the second hole (32) to install the X-ray detector (20) in the second hole. Also, the fixing member (fixing pin 60) guided by the guide portions (pin guides 20a, 20a) may be engaged with an engaging member (50) attached to the periphery of the above-ground portion (2a) of the reinforced concrete structure (2), to install the X-ray detector (20) on the above-ground portion (2a). Effect of the Invention

[0012] According to the present invention, it is possible to carry out X-ray inspection of underground portions of reinforced concrete structures. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example of an imaging system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing an example of an X-ray irradiation device according to an embodiment of the present invention. [Diagram 3] FIG. 2 is an explanatory diagram showing an example of a method for installing the imaging system according to the present embodiment. [Figure 4] FIG. 2 is an explanatory diagram showing an example of an excavation mode according to the present embodiment. [Diagram 5] FIG. 2 is an explanatory diagram showing an example of an installation mode of each device according to the embodiment. [Figure 6] 3 is an explanatory diagram showing an example of an installation mode of the X-ray shielding member according to the present embodiment. FIG. [Figure 7] 4 is an example of an X-ray image captured by the imaging system according to the present embodiment. [Figure 8] FIG. 11 is an explanatory diagram showing an example of an installation mode of each device according to a modified example. [Figure 9] FIG. 11 is an explanatory diagram showing an example of an underground installation mode of an X-ray detector according to a modified example. [Figure 10] FIG. 11 is an explanatory diagram showing an example of an underground installation mode of an X-ray detector according to a modified example. [Figure 11] FIG. 11 is an explanatory diagram showing an example of a ground installation mode of an X-ray detector according to a modified example. [Figure 12] FIG. 11 is an explanatory diagram showing an example of a ground installation mode of an X-ray detector according to a modified example. [Figure 13] FIG. 11 is an explanatory diagram showing an example of an excavation mode according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0015] [Shooting system] Fig. 1 is an explanatory diagram showing an example of an imaging system 1 according to this embodiment. Fig. 2 is an explanatory diagram showing an example of an X-ray irradiation device 10 according to this embodiment. The imaging system 1 of this embodiment includes a cylindrical X-ray irradiation device 10 and a flexible and bendable X-ray detector 20. Note that the imaging system 1 may include an X-ray shielding member 40, as described later.

[0016] 1 and 2, the X-ray irradiation device 10 is composed of a vertically long cylindrical housing 15 installed underground, a power supply 12 installed on the ground for applying a voltage to an X-ray tube 17, and a switch 13 for controlling the irradiation of X-rays. Fixed inside the housing 15 are the X-ray tube 17 containing an electron source 17a and a target 17b, and a DC / DC converter 16 that boosts the voltage supplied from the power supply 12 and applies the boosted voltage to the X-ray tube 17.

[0017] The X-ray tube 17 includes an electron source 17a and a target 17b. The material of the outer wall of the X-ray tube 17 is a material with high X-ray transparency and insulation, for example, ceramics (e.g., alumina ceramics). A collimator 17c (X-ray irradiation unit) made of a material with high X-ray transparency such as beryllium, hydrocarbon (plastic), boron carbide, or carbon is formed in a part of the outer wall, and X-rays are irradiated to the outside from the collimator 17c. Either a cold cathode electron source or a hot cathode electron source may be used as the electron source 17a (the X-ray tube 17 may be either a cold cathode X-ray tube or a hot cathode X-ray tube), but when a dry cell or bus power is used as the driving power source, it is preferable to adopt a cold cathode electron source as the electron source 17a for reasons described later. In addition, in this embodiment, since the X-ray tube 17 must be housed in the cylindrical housing 15, it is preferable to employ a cold cathode electron source (cold cathode X-ray tube) that allows the X-ray tube 17 to be miniaturized.

[0018] The target 17b generates X-rays by collision with electrons emitted from the electron source. For example, a tungsten target, a molybdenum target, a rhodium target, or the like can be used as the target 17b, and it is particularly preferable to use a tungsten target that has a high melting point and high resistance.

[0019] The outer wall of the housing 15 is made of a material that is lightweight, highly X-ray transmissive, and insulating, and for example, plastic such as polymethyl methacrylate resin (PMMA) is preferably used. However, ceramics (for example, alumina ceramics) may be used instead. In addition, an irradiation section 15a, which is a hole for irradiating X-rays to the outside, is formed on the side of the housing 15 at a position corresponding to the internal collimator 17c (X-ray irradiation section), and the X-rays irradiated from the collimator 17c pass through the irradiation section 15a and are irradiated to the outside (ground). In addition, the housing 15 is formed, at its upper end 152 when installed underground, with a wiring hole 152a as an extraction section from which the power lines 12a and 12b of the DC / DC converter 16 to which the anode wire connected to the target 17b and the cathode wire connected to the electron source 17a are connected are extracted. The power lines 12a and 12b extracted from the wiring hole 152a are connected to the power source 12 on the ground.

[0020] The power supply 12 that drives the X-ray irradiator 10 may be a battery or a power supply other than a battery. By adopting a cold cathode X-ray tube as the X-ray tube 17, heating is not required compared to the case of adopting a hot cathode X-ray tube, so that power is not consumed except when X-rays are irradiated. In addition to the DC / DC converter 16, a power storage mechanism (capacitor) may be provided inside or outside the housing 15 (above ground when installed). This makes it possible to store power using the power storage mechanism (capacitor) even with a low output power source, and use that power to irradiate X-rays when a predetermined amount of power has been stored.

[0021] Therefore, the power supply 12 may be, for example, a low-output battery, or may be a low-output power supply different from a battery, for example, a power supply connected to a USB port of the X-ray irradiator 10 (for example, a power supply for the measurement computer 25). That is, power may be stored based on the battery output to drive the X-ray irradiator 10, or power may be stored based on bus power to drive the X-ray irradiator 10.

[0022] For example, in the example of FIG. 8 described later, one AA battery (IEC and JIS: R6) is used for imaging, but even in this case, imaging is possible in 3 minutes or less or 1.5 minutes or less per shot, and when the object to be inspected is a utility pole, imaging is possible for the number of shots required to inspect one utility pole. Furthermore, if the capacity is about that of one AA battery, even if an operator is near the X-ray irradiation device 10 or if imaging is performed by mistake without using any X-ray shielding material, the amount of X-rays generated in one shot is smaller than that of general X-ray imaging, and even if irradiation is performed until one AA battery is used up, the dose rate is limited, so that the possibility of an exposure accident occurring when the capacity is used up is extremely low. From this perspective, it is preferable to use an AA battery as the driving power source in consideration of safety. The battery used may be a primary battery or a secondary battery. Furthermore, in this embodiment, the power source 12 can be installed on the ground, and the battery can be easily replaced on the ground with the X-ray irradiation device 10 installed underground, thereby improving the inspection efficiency.

[0023] Switch 13 operates based on a control signal (X-ray irradiation control signal) output from measurement computer 25, and the voltage supplied from power supply 12 is applied to X-ray tube 17 by the operation, and X-rays are irradiated. Switch 13 may be a semiconductor switch such as a MOSFET, or may be a relay switch.

[0024] The X-ray tube 17 may be a triode having an intermediate electrode as an auxiliary electrode between the electron source 17a (emitter) and the target 17b. In this case, for example, a DC / DC converter for applying anode voltage and a DC / DC converter for applying a cathode voltage are provided, and the intermediate electrodes are grounded. A positive high voltage is applied to the target 17b via one DC / DC converter, and a negative high voltage is applied to the electron source 17a via the other DC / DC converter, thereby making it possible to irradiate X-rays with high intensity.

[0025] The X-ray irradiator 10 is communicably connected to a measurement computer 25 and can be remotely operated by the measurement computer 25, and an operator can remotely irradiate X-rays by operating the measurement computer 25. The measurement computer 25 monitors the tube current, tube voltage, and the temperatures of the cathode and anode, which are detected by sensors (not shown) in the X-ray tube 17.

[0026] The measurement computer 25 and the X-ray irradiator 10 may be capable of wirelessly transmitting and receiving data (including control signals) via wireless LAN, Bluetooth (registered trademark), etc. For example, an operator in the measurement computer 25 may operate the X-ray irradiation, so that a high-frequency signal is output from the measurement computer 25, the high-frequency signal is received by a receiver (e.g., an RF circuit) connected to the switch 13, and the switch 13 is controlled to be ON by a controller connected to the receiver. The measurement computer 25 and the X-ray irradiator 10 may be configured to perform infrared communication.

[0027] The X-ray detector 20 is composed of a bendable, flexible flat panel detector, and detects X-rays emitted from the X-ray tube 17 and transmitted through the ground between the X-ray irradiator 10 and the underground portion 2b of the reinforced concrete structure 2, the underground portion 2b, and the ground between the underground portion 2b and the X-ray detector 20. The X-ray detector 20 includes a detection section in which pixels are arranged in a matrix on a substrate formed of a bendable, flexible resin or the like. For example, the detection section has pixels (each of a photodiode, a switching element, and a capacitor) integrated in a matrix, which accumulate electric charge according to the intensity of the incident X-rays.

[0028] For example, the charge stored in the capacitor of each pixel is extracted through a data line when each switching element connected to a corresponding switch line is closed based on a drive signal sent from the measurement computer 25. The extracted charge of each pixel is converted into a voltage signal by a similarly integrated charge amplifier, and further amplified to a predetermined level by an operational amplifier. The amplified voltage signal is converted into a predetermined digital signal by an A / D converter, input into the measurement computer 25, and reconstructed as a 2D or 3D image of the interior of the reinforced concrete structure 3.

[0029] The measurement computer 25 collects X-ray projection data (pixel data) of the underground portion 2b detected by the X-ray detector 20, and reconstructs an X-ray projection image (2D image) of the underground portion 2b or an internal image (3D image) of the underground portion 2b based on the collected pixel data. Therefore, the memory of the measurement computer 25 stores a data collection program for collecting pixel data from the X-ray detector 20, and an image creation program for reconstructing a 2D image or 3D image of the reinforced concrete structure 2 from the collected pixel data.

[0030] [How to set up the shooting system] Next, a method for installing the imaging system will be described with reference to FIGS. Fig. 3 is a flow chart showing a method for installing the imaging system, and Fig. 4 is an explanatory diagram showing an example of an excavation state around an underground part 2b of a reinforced concrete structure 2 (a utility pole in this example) consisting of an above-ground part 2a and an underground part 2b. Figs. 5 and 6 are cross-sectional views of the reinforced concrete structure 2 as viewed from above.

[0031] First, a vertically long cylindrical first hole 31 is formed by excavation in an area 3a (see FIG. 4(a)) near the outer periphery of the underground part 2b of the reinforced concrete structure 2 (see S110 in FIG. 3, FIG. 4(b), FIG. 5(a)). In this embodiment, in order to excavate the first hole 31 and the second hole 32 described later, an underground exploration device having a probe rod that injects high-pressure water (for example, an underground exploration device disclosed in Patent No. 4784870, which may be called a "hydraulic probe rod") is used, and since it is possible to excavate while exploring, there is a low risk of damaging buried objects. In addition, since it is possible to excavate a limited area deep by using the probe rod, it is possible to form a deep hole along a predetermined contour (for example, a circular or arc-shaped (groove-shaped) contour on the ground 3). In addition, a vacuum is used to collect generated mud during excavation.

[0032] In this embodiment, the cylindrical X-ray irradiator 30 has a maximum diameter of about 70 mm, so a first hole 31 having a diameter of about 70 to 100 mm corresponding to the maximum diameter is excavated. The first hole 31 is formed in a vertical direction from the ground 3 and approximately parallel to the outer circumferential surface of the underground portion 2b. The depth of the first hole 31 is set to a depth corresponding to the portion to be inspected (the region to be irradiated with X-rays) of the underground portion 2b.

[0033] Next, a groove-like second hole 32 approximately parallel to the outer periphery is formed in a region 3a (see FIG. 4(a)) near the outer periphery of the underground portion 2b of the reinforced concrete structure 2 (see S120 in FIG. 3, FIG. 4(b), and FIG. 5(a)). The X-ray detector 20 of this embodiment is flat, and a groove approximately 30 mm wide corresponding to its thickness (approximately 10 mm to 20 mm) is excavated. The second hole 32 is formed in a vertical direction from the ground 3 and approximately parallel to the outer periphery of the underground portion 2b. The depth of the second hole 32 corresponds to the inspection target portion of the underground portion 2b (area irradiated with X-rays).

[0034] The first hole 31 and the second hole 32 thus formed are located opposite each other across the underground portion 2b of the reinforced concrete structure 2, and the first hole 31, the underground portion 2b, and the second hole 32 are substantially parallel to the vertical direction underground. In addition, the outer circumferential surfaces of the second hole 32 and the underground portion 2b are substantially parallel to each other in the three-dimensional space.

[0035] Next, the X-ray irradiator 10 is waterproofed and dustproofed, and then inserted into the first hole 31 to install it (see S130 in FIG. 3). For example, the housing 15 is covered with a material having high X-ray transparency, such as a film of polyethylene (PE), polypropylene (PP), or polyvinyl chloride (PVC), to perform waterproofing and dustproofing, and then the housing 15 is installed in the hole 31. Then, the power lines 12a and 12b drawn out from the wiring hole 152a to the ground, and the power source 12 and switch 13 connected thereto, are installed on the ground (see FIG. 2 and FIG. 5(b)).

[0036] Next, the X-ray detector 20 is waterproofed and dustproofed in the same manner as the X-ray irradiation device 10, and then the X-ray detector 20 is curved to correspond to the curvature of the groove of the second hole 32 (see S140 in FIG. 3), and is installed by inserting it along the groove of the second hole 32 (see S150 in FIG. 3 and FIG. 5(b)).

[0037] The installation position of the X-ray irradiator 10 is determined by the bottom and side surfaces of the first hole 31, and the X-ray irradiator 10 is fixed only by the shape of the first hole 31 without the need for a fixing member to the reinforced concrete structure 2, and the position of the X-ray detector 20 relative to the underground portion 2b of the reinforced concrete structure 2 is determined. The installation position of the X-ray detector 20 is determined by the bottom and side surfaces of the second hole, and the X-ray detector 20 is fixed only by the shape of the second hole 32 without the need for a fixing member to the reinforced concrete structure 2, and the position of the X-ray irradiator 10 relative to the underground portion 2b of the reinforced concrete structure 2 is determined. The X-ray irradiator 10 and the X-ray detector 20 thus installed are located opposite each other across the underground portion 2b of the reinforced concrete structure 2, and the X-ray irradiator 10, the underground portion 2b, and the X-ray detector 20 are approximately parallel to each other in the vertical direction underground. In addition, the outer circumferential surfaces of the X-ray detector 20 and the underground portion 2b are approximately parallel to each other in three-dimensional space.

[0038] Here, if the portion to be inspected (area to be irradiated with X-rays) of the underground portion 2 of the reinforced concrete structure 2 is located at a relatively deep position (NO in S160 in Figure 3), for example, if the upper end of the X-ray detector 20 is located deep enough in the ground (depth of 50 cm or more), there is little possibility of X-rays leaking onto the ground from the first hole 31 or the second hole 32, and the risk of exposure is low, so there is no need to use the X-ray shielding member 40 covering the first hole 31 and the second hole 32, and it is sufficient to simply turn on the switch 13 remotely to irradiate X-rays. On the other hand, if the portion to be inspected in the underground section 2 (the area to be irradiated with X-rays) is located at a relatively shallow position (YES in S160 in Figure 3), for example, if it is deep enough that the upper end of the X-ray detector 20 cannot be contained in the ground (less than 50 cm deep), there is a high possibility that X-rays will leak onto the ground from the first hole 31 and the second hole 32, posing a risk of exposure, so an X-ray shielding member 40 is used to cover the first hole 31 and the second hole 32 (see S170 in Figure 3).

[0039] As shown in FIG. 6, the X-ray shielding member 40 of this embodiment is composed of four arc-shaped pieces 40a-40d which are lead plates (for example, thin plates with a thickness of about 0.5-2 mm). The overlapping degree of each piece (diameter of a circle formed by the four pieces) is adjusted according to the contour of the ground edge of the reinforced concrete structure 2, thereby covering the entire first hole 31 and the second hole 32, and efficiently shielding the X-rays around the ground edge while avoiding the reinforced concrete structure 2. In this example, the first hole 31 is covered by the piece 40b, and the second hole 32 is covered by the pieces 40a, 40d, and 40c. The number of overlapping pieces may be adjusted according to the intensity of the X-rays. For example, when the risk of exposure is low, the first hole 31 is covered by only one piece, but when the risk of exposure is high, the first hole 31 may be covered by three overlapping pieces.

[0040] In this way, the shape of the X-ray shielding member 40 consisting of the pieces 40a-40d is made to follow the contour of the outer periphery of the ground-level portion of the reinforced concrete structure 2, thereby appropriately covering the first hole 31 and the second hole 32 and preventing leakage of X-rays while avoiding the reinforced concrete structure 2. Furthermore, by configuring the X-ray shielding member 40 from a plurality of pieces, it is possible to accommodate a variety of diameters by adjusting the overlap between the pieces.

[0041] 3, the formation of the first hole 31 (S110) and the formation of the second hole 32 (S120) may be performed in any order, and the insertion of the X-ray source into the first hole 31 (S130) and the insertion of the detection unit into the second hole (S140 and S150) may be performed in any order. Also, one of the first hole 31 and the second hole 32 may be formed first and a device corresponding to the one hole may be installed, and then the other hole may be formed and a device corresponding to the other hole may be installed.

[0042] [Photography results using the shooting system] After installing the imaging system 1 by the installation method described above, an X-ray image is taken by operating the measurement computer 25. An example of an X-ray image thus obtained is shown in FIG. 7. As shown in FIG. 7, even when the X-ray source and the detection unit are installed underground, an X-ray image is obtained at a level that allows deterioration of the reinforcing bars to be determined. In this way, the installation method and installation system according to this embodiment make it possible to perform X-ray inspection of the underground portion of a reinforced concrete structure.

[0043] Furthermore, according to this embodiment, unlike when used on the ground, there is no need to cover the X-ray source itself with an X-ray shielding member, and there is also no need to place an X-ray shielding plate on the back side of the detection unit, so the entire imaging system 1 can be made smaller and lighter. For example, as in this embodiment, the X-ray irradiator 10 can be made into a long and thin cylindrical structure, and there is no need to combine an X-ray shielding plate on the back side of the X-ray detector 20. This makes it easier to transport and install each device, and makes it possible to efficiently inspect reinforced concrete structures.

[0044] Furthermore, according to this embodiment, since it is possible to miniaturize the X-ray source and the detection unit, the cross-sectional area of ​​the first hole 31 that houses the X-ray irradiator 10 and the cross-sectional area of ​​the second hole 32 that houses the X-ray detector 20 may both be small. And, since it is sufficient to excavate these small areas in the vertical direction using high-pressure water, the workload is small, and the installation of the X-ray irradiator 10 and the X-ray detector 20 can be completed without affecting the stability of the reinforced concrete structure 2 due to an increase in the excavation area.

[0045] [Other forms] (1-1) As described above, the X-ray detector 20 is vertically long, small, and lightweight, and the diameter of the corresponding first hole 31 can be small, so that it is possible to excavate a plurality of first holes 31 as shown in FIG. 8(a) (31, 31). Then, one X-ray irradiator 10 may be installed in one of the first holes 31 to perform imaging from a first angle and obtain a first X-ray image, and then the X-ray irradiator 10 may be pulled out of one of the first holes 31 and installed in the other first hole 31 to perform imaging from a second angle and obtain a second X-ray image. In this way, the underground portion 2b may be photographed from a plurality of angles to obtain results.

[0046] (1-2) Also, as shown in Fig. 8(b), a plurality of X-ray irradiators 10 may be prepared (10, 10), one X-ray irradiator 10 may be installed in one of the first holes 31, and the other X-ray irradiator 10 may be installed in the other first hole 31 to obtain a first X-ray image taken from a first angle and a second X-ray image taken from a second angle. In this way, the underground portion 2b may be photographed from a plurality of angles with only one installation.

[0047] (2-1) In the above embodiment, an example has been described in which the flexible X-ray detector 20 is fixed in the second hole 32 by inserting the X-ray detector 20 into the second hole 32 in a curved state corresponding to the curvature of the groove of the second hole 32, but the present invention is not limited to this, and the X-ray detector 20 may be fixed in the second hole 32 by other fixing means. For example, as shown in Figs. 9 and 10, the X-ray detector 20 may be fixed in the second hole 32 by fixing pins 60 guided by pin guides 20a, 20a at both left and right ends of the X-ray detector 20'.

[0048] That is, as shown in Fig. 9(a), pin guides 20a are formed at the upper and lower parts of one end of both the left and right ends of the X-ray detector 20', and pin guides 20a are also formed at the upper and lower parts of the other end. As shown in Fig. 9(b), the operator curves the X-ray detector 20' in accordance with the curvature of the groove of the second hole 32 (for example, by holding both the left and right ends of the X-ray detector 20' (pin guides 20a, 20a) and bringing them close to each other), and then inserts the X-ray detector 20' into the second hole 32 as shown in Fig. 9(c).

[0049] Next, as shown in Fig. 10(d), the worker passes the fixing pin 60 through the pin guides 20a, 20a on one end side from above, and also passes the fixing pin 60 through the pin guides 20a, 20a on the other end side from above. Furthermore, as shown in Fig. 10(e), the worker pushes in the flange-shaped portion 61 of the fixing pin 60 on one end side from above, so that the tip of the fixing pin 60 guided by the pin guides 20a, 20a on the one end side is stuck into the bottom surface of the hole 32, and also pushes in the flange-shaped portion 61 of the fixing pin 60 on the other end side from above, so that the tip of the fixing pin 60 guided by the pin guides 20a, 20a on the other end side is stuck into the bottom surface of the hole 32, thereby firmly fixing both ends of the X-ray detector 20' in the ground. As a result, compared to when the X-ray detector 20' is simply inserted into the second hole 32, the X-ray detection surface is stably fixed (the curvature is maintained close to the outer peripheral surface of the underground portion 2b), making it possible to obtain clearer X-ray images.

[0050] (2-2) Here, the pin guides 20a, 20a shown in (2-1) above can also be used for attachment to the above-ground portion 2a of the reinforced concrete structure 2. FIGS. 11 and 12 show a form in which the X-ray detector 20' is attached to the above-ground portion 2a of the reinforced concrete structure 2. As shown in FIG. 11, an engagement member 50 is attached to the periphery of the above-ground portion 2a via a band 5. For example, a well-known band made of stainless steel or resin can be used as the band 5, and the band 5 can be attached (fixed by tightening) to the reinforced concrete structure 2 by a well-known technique such as a ratchet mechanism or bolts and nuts. Note that a chain may be used instead of the band 5 to fix the engagement member 50 to the periphery of the above-ground portion 2a. For example, a chain may be wound around the above-ground portion 2a and locked in a tightened state, so that the engagement member 50 connected to the chain can be attached to the periphery of the above-ground portion 2a.

[0051] The engaging member 50 has a band hole 50a in the shape of a long and narrow groove formed in parallel with the longitudinal direction (left-right direction), and a seat 51 having an engaging pin 52 protruding upward is formed at a position facing the inner peripheral surface of the engaging member 50. When the band 5 is passed through the band hole 50a and then tightened, the inner peripheral surface of the engaging member 50 and the outer peripheral surface of the ground part 2a are fixed in a state of being in close contact with each other by the band 5. The engaging pin 52 is inserted into an engaging hole 61a formed in a flange-shaped part 61 of the fixing pin 60 and engaged with it, thereby connecting the fixing pin 60 and the engaging member 50. The engaging pin 52 may be tapered, the diameter of which decreases toward the top, and the diameter of the engaging hole 61a may be smaller than the maximum diameter of the engaging pin 52, so that the fixing pin 60 is pushed in from above, and the periphery of the engaging pin 52 is tightened by the engaging hole 61a, and the fixing pin 60 and the engaging member 50 are stably fixed.

[0052] The engagement members 50, 50 are attached to the periphery of the ground portion 2a via the band 5 in accordance with the positions of both ends of the X-ray detector 20'. Both ends of the X-ray detector 20' are lowered from above in accordance with the positions of the fixing pins 60, 60, and one fixing pin 60 is inserted into the upper and lower pin guides 20a, 20a on one end side of the X-ray detector 20', and the other fixing pin 60 is inserted into the upper and lower pin guides 20a, 20a on the other end side of the X-ray detector 20', thereby connecting the X-ray detector 20' to the fixing pins 60, 60. In this way, as shown in FIG. 12, the X-ray detector 20' is fixed to the periphery of the ground portion 2a by the band 5, the engagement members 50, 50, and the fixing pins 60, 60.

[0053] In this way, the pin guides 20a, 20a at both ends of the X-ray detector 20' guide the fixing pins 60, 60 pushed in from above underground so that the tips of the fixing pins 60, 60 penetrate into the bottom surface of the second hole 32, and above ground they guide the fixing pins 60, 60 inserted from below to the upper side of the X-ray detector 20', thereby contributing to installation in both the underground part 2b and the aboveground part 2a.

[0054] (2-3) In the example of Figs. 10 to 12, the fixing pin 60 can be used for both installation in the underground part 2b and installation in the aboveground part 2a. This allows the X-ray detector 20' to be fixed to either the aboveground part 2a or the underground part 2b without increasing the number of parts required for installing the X-ray detector 20'. In addition, the present invention is not limited to this form, and the type of fixing pin may be different when fixing the X-ray detector 20' to the underground part 2b and when fixing the X-ray detector 20' to the aboveground part 2a. For example, a fixing pin with a sharp tip may be used for underground use so as to easily insert into the bottom surface of the second hole 32, and a fixing pin with a rounded tip may be used for aboveground use to prevent danger.

[0055] (2-4) Although not shown, the X-ray irradiation device 10 may be fixed to the ground part 2a by using the engagement member 50 or by other known methods. For example, a flange-shaped part having an engagement hole (for example, a part having the same shape as the flange-shaped part 61 of the fixing pin 60 shown in FIG. 11 and protruding radially from the housing 15) may be formed in the cylindrical housing 15, and the X-ray irradiation device 10 may be connected to the engagement member 50 without using the fixing pin 60 by engaging the engagement pin 52 with the engagement hole. Also, for example, a cylindrical guide part having a diameter slightly larger than the diameter of the housing 15 and an open upper surface may be formed on the base 51 of the engagement member 50, and the X-ray irradiation device 10 may be installed on the ground part 2a via the engagement member 50 without using a fixing pin by inserting the cylindrical housing 15 into the guide part.

[0056] (3) In the above embodiment, when the first hole 31 and / or the second hole 32 are formed near the underground portion 2b of the reinforced concrete structure 2, they may be formed so as to contact the outer peripheral surface of the underground portion 2b, as shown in FIG. 13(a), for example. For example, if there is no problem even if the high-pressure water discharged from the underground exploration device contacts the outer peripheral surface of the underground portion 2b, the first hole 31 and / or the second hole 32 may be formed in a state in which the outer peripheral surface of the underground portion 2b is exposed by the high-pressure water. In other words, a part of the side surface of the first hole 31 and / or the second hole 32 formed by the high-pressure water (the surface on the reinforced concrete structure 2 side) may be made to be the outer peripheral surface of the underground portion 2b. In this state, as shown in Figure 13 (b), by inserting the X-ray irradiation device 10 into the first hole 31, the X-ray irradiation device 10 is supported and fixed by the side surface of the first hole 31 including part of the outer peripheral surface of the underground portion 2b and the bottom surface of the first hole 31, and by inserting the X-ray detector 20 into the second hole 32, the X-ray detector 20 is supported and fixed by the side surface of the second hole 32 including part of the outer peripheral surface of the underground portion 2b and the bottom surface of the second hole 32.

[0057] (4) In the above embodiment, the reinforced concrete structure 2 to which the imaging system 1 can be applied is an electric pole, but the invention is not limited thereto and the reinforced concrete structure 2 may be any structure having an underground portion that can be excavated. The imaging system 1 can be applied to, for example, reinforced concrete pillars having a circular or annular cross section, and can also be applied to cylindrical or cylindrical reinforced concrete pillars, including those that are tapered. [Explanation of symbols]

[0058] 1. Shooting System 2. Reinforced concrete structures 2a Above ground part 2b Underground part 3 ground 3a Area near the periphery 5 Bands 31 Hole 1 32 2nd hole 10 X-ray irradiation device 12 Power supply 12a power line 12b power line 13. Switch 15. Cabinet 15a Irradiation section 152 Upper end 152a Wiring hole 16 DC / DC Converters 17 X-ray tube 17a electron source 17b Target 17c Collimator 20 X-ray detector 20' X-ray detector 20a Pin Guide 25 Measurement computer (computer) 40 X-ray shielding material 40a piece 40b piece 40c piece 40d piece 50 Engagement member 50a Band hole 51 Pedestal 52 Engagement pin 60 Fixing pin 61 Collar 61a Engagement hole

Claims

1. A method for installing an imaging system for imaging a reinforced concrete structure using X-rays, comprising the steps of: forming a vertically elongated first hole near an outer periphery of the underground portion of the reinforced concrete structure; forming a groove-shaped second hole in the vicinity of the outer periphery of the underground portion and substantially parallel to the outer periphery; The position of the first hole is a position opposite to the second hole across the underground portion, installing an X-ray irradiator in the first hole; placing a flexible x-ray detector in the second hole; Further comprising: How to set up a photography system.

2. The installation method of claim 1, A plurality of the first holes are formed, and the X-ray irradiation device is installed in each of the first holes. How to set up a photography system.

3. The installation method of claim 1, The first hole and the second hole are drilled by high pressure water. How to set up the photography system.

4. The installation method according to any one of claims 1 to 3, and further comprising providing an X-ray shielding member covering the first hole and the second hole. the X-ray shielding member is composed of a plurality of pieces, The plurality of pieces are installed along the outer periphery of the ground edge of the reinforced concrete structure. How to set up a photography system.

5. The installation method of claim 1, the X-ray detector has guide portions at both ends for guiding a fixing member; the fixing member guided by the guide portion is inserted into a bottom surface of the second hole, thereby installing the X-ray detector in the second hole. How to set up a photography system.

6. The installation method of claim 5, and when imaging the above-ground portion of the reinforced concrete structure, the method further includes installing the X-ray detector on the above-ground portion by engaging the fixing member guided by the guide part with an engaging member attached to a periphery of the above-ground portion of the reinforced concrete structure. How to set up a photography system.

7. An imaging system for imaging a reinforced concrete structure using X-rays, comprising: an X-ray irradiation device installed in a vertically long first hole formed in the vicinity of the outer periphery of the underground portion of the reinforced concrete structure; a second hole in a groove shape formed in the vicinity of the outer periphery of the underground portion and substantially parallel to the outer periphery; and Shooting system.

8. The imaging system of claim 7, The first hole is formed in plurality, a plurality of the X-ray irradiation devices installed in the respective first holes; Shooting system.

9. The imaging system of claim 7, The X-ray irradiator has a cylindrical housing that covers a cold cathode X-ray tube, The housing has an irradiation section for irradiating X-rays on a side surface thereof and an extraction section from which a power line is extracted at one end thereof. Shooting system.

10. The imaging system according to any one of claims 7 to 9, The X-ray shielding member includes a plurality of pieces. The plurality of pieces are installed so as to cover the first hole and the second hole along an outer circumferential contour of the ground portion of the reinforced concrete structure. Shooting system.

11. The imaging system of claim 7, the X-ray detector has guide portions at both ends for guiding a fixing member; the fixing member guided by the guide portion is inserted into a bottom surface of the second hole, whereby the X-ray detector is installed in the second hole. Shooting system.

12. The imaging system of claim 11, the fixing member guided by the guide portion engages with an engaging member attached to the periphery of the above-ground portion of the reinforced concrete structure, thereby installing the X-ray detector on the above-ground portion. Shooting system.

Images