Abnormality detection device and abnormality detection method

Abstract

To appropriately detect abnormality of pier studs in consideration of temperatures of the pier studs.SOLUTION: An abnormality detection device 40 is a device for detecting abnormality of pier studs, in a radial gate in which a skin plate is supported by the plurality of pier studs. The abnormality detection device 40 includes: an evaluation value measuring part 46 for measuring a stress evaluation value indicating stress applied to a target pier stud by regarding one pier stud included in the plurality of pier studs as the target pier stud; a pier column temperature measuring part 47 for measuring a temperature of the target pier stud; a storage part 42 for storing temperature-stress information 421 indicating a relation between a temperature related value derived from the temperature of the target pier stud and a normal value of the stress evaluation value of the target pier stud; and a determination part 41 for specifying the normal value of the stress evaluation value of the target pier stud by referring to the temperature-stress information 421 using a measurement value of the temperature of the target pier stud by the pier column temperature measuring part 47, and determining presence / absence of abnormality by comparing the measurement value of the stress evaluation value of the target pier stud by the evaluation value measuring part 46 with the normal value.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an abnormality detection device and an abnormality detection method. [Background technology]

[0002] Conventionally, radial gates have been used in dams and the like. The pedestals of radial gates are constantly subjected to compressive loads due to water pressure. In addition, if a long time has passed since the installation of a radial gate, deterioration of the pedestals is a concern. Therefore, for example, periodic inspections are performed once every few years, and the soundness of the radial gate's pedestals is confirmed by strain measurement and visual inspection. In addition, Patent Document 1 discloses an abnormality detection device that detects abnormalities in a radial gate. In this device, a value indicating the load applied to a connecting medium that connects a gate body and a drive unit is obtained as a support load value, and a value indicating the stress applied to the pedestal is obtained as a pedestal evaluation value. A normal value of the pedestal evaluation value is estimated based on the water level of the radial gate, the opening degree of the gate body, and the support load value, and the presence or absence of an abnormality in the radial gate is determined by comparing the acquired pedestal evaluation value with the estimated normal value.

[0003] Patent Document 2 discloses a system for suppressing thermal cracks occurring in the surface layer of a concrete structure. In this system, a tensioning structure installed in a concrete structure includes tensioning means for introducing tension into a tensioning member. Temperature stress is calculated based on the outside air temperature around the concrete structure, and the tension to be applied by the tensioning means is calculated. Patent Document 3 discloses a method for managing thermal cracks in mass concrete, in which a thermometer and a strain gauge are used to measure the temperature and strain, respectively, of the mass concrete structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-37394 A [Patent Document 2] JP 2015-212466 A [Patent Document 3] JP 2001-207430 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, in Patent Document 1, the presence or absence of an abnormality in the radial gate is determined based on an evaluation value indicating the stress on the leg, but the stress on the leg is also affected by temperature. Therefore, a method for appropriately detecting an abnormality in the leg while taking into account the leg temperature is required.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to appropriately detect abnormalities in the landing gear by taking into account the temperature of the landing gear. [Means for solving the problem]

[0007] A first aspect of the present invention is an abnormality detection device for detecting abnormalities in a leg in a radial gate in which a skin plate is supported by a plurality of legs, and includes an evaluation value measurement unit for measuring a stress evaluation value indicating the stress acting on one of the plurality of legs as a leg of interest, a leg temperature measurement unit for measuring the temperature of the leg of interest, a memory unit for storing temperature-stress information indicating the relationship between a temperature-related value derived from the temperature of the leg of interest and a normal value of the stress evaluation value of the leg of interest, and a judgment unit for identifying the normal value of the stress evaluation value of the leg of interest by referring to the temperature-stress information using the measured value of the temperature of the leg of interest by the leg temperature measurement unit, and for determining the presence or absence of an abnormality by comparing the measured value of the stress evaluation value of the leg of interest by the evaluation value measurement unit with the normal value.

[0008] A second aspect of the present invention is an abnormality detection device of the first aspect, wherein the stud temperature measurement unit individually measures the temperatures of two or more studs including the stud of interest, the temperature-related value is derived from the temperatures of the two or more studs, and the judgment unit uses the measured values ​​of the temperatures of the two or more studs to identify the normal value of the stress evaluation value of the stud of interest.

[0009] A third aspect of the present invention is the anomaly detection device according to the second aspect, wherein the temperature-related value is a temperature difference between two legs including the target leg.

[0010] A fourth aspect of the present invention is an abnormality detection device according to any one of aspects 1 to 3, further comprising a water level meter for measuring the water level of the radial gate, wherein the memory unit stores a plurality of temperature-stress information indicating the relationship at a plurality of water levels, and the judgment unit selects temperature-stress information to be used for identifying the normal value from the plurality of temperature-stress information using the water level measurement value by the water level meter.

[0011] A fifth aspect of the present invention is an abnormality detection device according to any one of aspects 1 to 3, further comprising a water level meter for measuring the water level of the radial gate, wherein the temperature-stress information indicates the relationship at a constant water level, the memory unit stores water level-stress information indicating the relationship between the water level of the radial gate and the normal value of the stress evaluation value of the target leg, and the judgment unit obtains from the water level-stress information a correction amount corresponding to the difference between the water level measured by the water level meter and the constant water level, and when comparing the measured value and the normal value of the stress evaluation value of the target leg, uses the correction amount to correct the measured value or the normal value.

[0012] A sixth aspect of the present invention is an abnormality detection device for detecting abnormalities in a strut in a radial gate in which a skin plate is supported by a plurality of struts, the abnormality detection device including an evaluation value measurement unit for measuring a stress evaluation value indicating the stress acting on one of the plurality of struts as a strut of interest, a strut temperature measurement unit for measuring the temperature of the strut of interest, a water level gauge for measuring the water level of the radial gate, a memory unit for storing water level-stress information indicating the relationship between the water level of the radial gate and a normal value of the stress evaluation value of the strut of interest, and a water level measurement value measured by the water level gauge and referring to the water level-stress information to identify the normal value of the stress evaluation value of the strut of interest, The system further includes a judgment unit which judges whether or not there is an abnormality by comparing the measured value of the stress evaluation value of the target leg by the evaluation value measurement unit with the normal value, wherein the memory unit stores temperature-stress information indicating the relationship between a temperature-related value derived from the temperature of the target leg and the normal value of the stress evaluation value of the target leg, the water level-stress information corresponding to a certain temperature-related value, and the judgment unit obtains from the temperature-stress information a correction amount corresponding to the difference between the temperature-related value derived from the measured value of the temperature of the target leg and the certain temperature-related value, and when comparing the measured value of the stress evaluation value of the target leg with the normal value, the correction amount is used to correct the measured value or the normal value.

[0013] A seventh aspect of the present invention is an anomaly detection method for detecting abnormalities in a stud in a radial gate in which a skin plate is supported by a plurality of studs, comprising the steps of: a) measuring a stress evaluation value indicating the stress acting on one of the plurality of studs as a stud of interest; b) measuring the temperature of the stud of interest; c) preparing in advance temperature-stress information indicating the relationship between a temperature-related value derived from the temperature of the stud of interest and a normal value of the stress evaluation value of the stud of interest, and identifying the normal value of the stress evaluation value of the stud of interest by referring to the temperature-stress information using the measured value of the temperature of the stud of interest in step b); and d) determining the presence or absence of an abnormality by comparing the measured value of the stress evaluation value of the stud of interest in step a) with the normal value.

[0014] An eighth aspect of the present invention is an anomaly detection method for detecting an anomaly in a stud in a radial gate in which a skin plate is supported by a plurality of studs, the method comprising the steps of: a) determining a stress evaluation value indicating a stress acting on a stud of interest, the stud being one of the plurality of studs; b) measuring a temperature of the stud of interest; c) measuring a water level in the radial gate; d) water level-stress information indicating a relationship between the water level in the radial gate and a normal value of the stress evaluation value of the stud of interest is prepared in advance, and the normal value of the stress evaluation value of the stud of interest is specified by referring to the water level-stress information using the measured water level in the c) step; and e. ) a process for determining the presence or absence of an abnormality by comparing the measured value of the stress evaluation value of the target pedestal in process a) with the normal value, wherein temperature-stress information indicating the relationship between a temperature-related value derived from the temperature of the target pedestal and the normal value of the stress evaluation value of the target pedestal is prepared in advance, the water level-stress information corresponds to a certain temperature-related value, a correction amount corresponding to the difference between the temperature-related value derived from the measured value of the temperature of the target pedestal and the certain temperature-related value is obtained from the temperature-stress information, and in a comparison of the measured value of the stress evaluation value of the target pedestal with the normal value in process e), the measured value or the normal value is corrected using the correction amount. Effect of the Invention

[0015] According to the present invention, abnormalities in the legs can be appropriately detected by taking into account the temperature of the legs. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing the configuration of a water gate system. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] 1 is a block diagram showing a configuration of an abnormality detection device; [Diagram 5] FIG. 13 is a diagram showing a process flow for detecting an abnormality in a leg column. [Figure 6]FIG. 13 is a diagram showing temperature-stress information. [Figure 7] FIG. [Figure 8] FIG. 13 is a diagram showing temperature-stress information. [Figure 9] FIG. 13 is a diagram showing water level-stress information. [Figure 10A] FIG. 13 is a diagram showing the results of the finite element method for the relationship between the water level of a radial gate and the stress of multiple pillars. [Figure 10B] FIG. 13 is a diagram showing the results of the finite element method for the relationship between the water level of a radial gate and the stress of multiple pillars. [Figure 11] FIG. 13 is a diagram showing water level-stress information. [Figure 12] FIG. 13 is a diagram showing temperature-stress information. [Figure 13] FIG. 13 is a diagram showing temperature-stress information. [Figure 14] FIG. 13 is a diagram showing water level-stress information. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] (First embodiment) FIG. 1 is a diagram showing the configuration of a water gate system 1 according to a first embodiment of the present invention. The water gate system 1 includes a radial gate 10, which is a water gate, and a computer 4. The radial gate 10 in FIG. 1 is provided in a dam, and the computer 4 is provided, for example, in a building adjacent to the dam. The radial gate 10 may be provided in a facility other than a dam (for example, a levee, etc.). The computer 4 may be provided in a location far away from the radial gate 10. In this case, various measuring units attached to the radial gate 10 are connected to a communication device or the like, and are capable of communicating with the computer 4 via a network such as the Internet. The computer 4 may be a computer provided by a cloud service.

[0018] The radial gate 10 includes a door body 2 and an opening / closing device 3. The door body 2 is installed at an opening 91 provided in the dam bank and is used to adjust the flow of water at the opening 91. The door body 2 is formed of, for example, metal. The door body 2 includes a skin plate 21 and two plate support parts 22 (see FIG. 2 described later). The skin plate 21 is a plate-like member substantially parallel to the rotation axis J1 in FIG. 1. The cross-sectional shape of the skin plate 21 perpendicular to the rotation axis J1 is substantially an arc shape with a predetermined radius centered on the rotation axis J1. The skin plate 21 is provided across two side surfaces 911 (hereinafter referred to as "opening side surfaces 911") of the opening 91 substantially perpendicular to the rotation axis J1.

[0019] Fig. 2 is a plan view showing the plate support part 22, and Fig. 2 shows a cross section (a cross section on a plane including the rotation axis J1) at the position of a girder 25 described below for the skin plate 21. As shown in Fig. 2, the two plate support parts 22 are provided apart in the direction of the rotation axis J1 and disposed near the two opening side surfaces 911. In other words, a plate support part 22 is provided on each of the left bank side and the right bank side.

[0020] As shown in FIG. 1 and FIG. 2, each plate support 22 includes a bearing 23 and a plurality of legs 24. The bearing 23 is a rotating part of the door body 2, and typically includes a trunnion hub 231 and a trunnion pin 232, as shown in FIG. 1. The trunnion pin 232 is fixed to the bank body of the dam (for example, the opening side surface 911). The trunnion hub 231 is a cylindrical member, and is fitted into the trunnion pin 232 via a radial bearing. The trunnion hub 231 is supported by the trunnion pin 232 so as to be rotatable about a rotation axis J1. The rotation axis J1 coincides with the center of the trunnion pin 232. In the bearing 23, a thrust bearing may be further provided for the trunnion hub 231. Depending on the design of the bearing 23, the trunnion hub 231 may be fixed to the bank body, and the trunnion pin 232 may be rotatably supported by the trunnion hub 231. That is, the rotating body in the support portion 23 may be either the trunnion hub 231 or the trunnion pin 232.

[0021] The plurality of pedestals 24 are elongated members extending from the rotating body of the support portion 23 (here, the trunnion hub 231) toward the skin plate 21. Typically, each plate support portion 22 has two pedestals 24. The two pedestals 24 are fixed to the rotating body of the support portion 23 at an acute angle. Each pedestal 24 is, for example, an H-shaped steel or an I-shaped steel. Two beams 25 are provided on the surface of the skin plate 21 facing the support portion 23. Each beam 25 is an elongated member substantially parallel to the rotation axis J1. The ends of the two pedestals 24 on the opposite side to the support portion 23 are fixed to the two beams 25, respectively. In the door body 2, the skin plate 21 and the support portion 23 are connected by the beams 25 and the pedestals 24. Depending on the design of the door body 2, the pedestals 24 may be directly connected to the skin plate 21. The skin plate 21 may be supported by a plurality of piers 24. The number of piers 24 and girders 25 in the plate support portion 22 may be changed arbitrarily.

[0022] A pulley (sheave) 26 is further provided on each plate support portion 22. The pulley 26 is a movable pulley that moves (rotates) together with the door body 2. In the example of FIG. 1, the pulley 26 is disposed near the lower girder 25. The number and positions of the pulleys 26 may be changed as appropriate. In the door body 2, a reinforcing member may be provided as appropriate between the two pillars 24 of each plate support portion 22, on the surface of the skin plate 21 on the support portion 23 side, etc.

[0023] The side portion 211 facing each opening side surface 911 in the skin plate 21 has a surface approximately parallel to the opening side surface 911. The side portion 211 is provided with a watertight rubber (not shown). The side portion 211 contacts the opening side surface 911, which is a door stop, via the watertight rubber. The watertight rubber may be provided on the opening side surface 911. Each side portion 211 of the skin plate 21 is preferably provided with a side roller (not shown) that rolls on the opening side surface 911. This allows the door body 2 to rotate smoothly around the rotation axis J1. In the skin plate 21, the lower end portion 213 is also provided with a watertight rubber. As shown in FIG. 1, when the radial gate 10 is closed, the lower end portion 213 contacts the bottom surface 912 of the opening 91, which is a door stop, via the watertight rubber. The watertight rubber may be provided on the bottom surface 912. In addition, when the radial gate 10 is installed halfway up a dam, a watertight rubber is also provided on the upper end of the skin plate 21.

[0024] The opening and closing device 3 is, for example, of a wire rope winch type, and rotates the gate body 2 to open and close the gate body 2 (open and close the opening 91). The opening and closing device 3 includes, for example, a drive unit 31 and two metal wire ropes 36. The drive unit 31 has two drums 311. The two drums 311 are respectively disposed above the two opening side surfaces 911. As described later, a part of the wire rope 36 is wound around each drum 311. In the radial gate 10, a drum 311 and a wire rope 36 are provided on each of the left bank side and the right bank side. In FIG. 1, only one drum 311 and one wire rope 36 are illustrated. The number of drums 311 and wire ropes 36 may be changed arbitrarily.

[0025] The two drums 311 are connected via gears or the like to a shaft (not shown) extending in the direction of the rotation axis J1. The shaft is connected to an electric motor via a reducer or the like. In the drive unit 31, the electric motor rotates the shaft, causing the two drums 311 to rotate in the same rotation direction. In the drive unit 31, the rotation direction of the drums 311 can be switched between forward and reverse.

[0026] One end of a wire rope 36 serving as a connecting medium is fixed to each drum 311, and a portion of the wire rope 36 is wound around the drum 311. The portion of each wire rope 36 that is not wound around the drum 311 is hung on the pulley 26 of the plate support portion 22. The other end of the wire rope 36 is held in the vicinity of the drum 311. In the radial gate 10, the gate body 2 and the drive portion 31 are connected by the wire rope 36.

[0027] In the opening and closing device 3, the drum 311 rotates forward, whereby the wire rope 36 is wound around the drum 311, and the door body 2 in FIG. 1 rotates clockwise around the rotation axis J1. This causes the skin plate 21 to move in a direction away from the bottom surface 912 of the opening 91 (i.e., to rise). Also, the drum 311 rotates in the reverse direction, whereby the wire rope 36 is let out from the drum 311, and the door body 2 rotates counterclockwise around the rotation axis J1. This causes the skin plate 21 to move in a direction approaching the bottom surface 912 of the opening 91 (i.e., to descend). In this manner, the door body 2 is opened and closed at the opening 91.

[0028] The opening and closing device 3 may be of a door body front winding type, in which case one end of a wire rope 36 is attached to the front surface of the skin plate 21, which is the surface opposite to the leg pillar 24. In the opening and closing device 3, a rope other than the wire rope 36 or another cord-like member such as a chain may be used as the connecting medium. Also, the driving source in the drive unit 31 may be a hydraulic cylinder or the like that performs linear motion, in which case a cylinder rod connected to the door body 2 serves as the connecting medium.

[0029] The watergate system 1 in Fig. 1 further includes an evaluation value measurement unit 46, a spur temperature measurement unit 47, a water level gauge 11, and an opening gauge 12. The evaluation value measurement unit 46 and the spur temperature measurement unit 47 are included in an abnormality detection device 40 (see Fig. 4) described below. The water level gauge 11 and the opening gauge 12 are installed in a dam, for example. As described below, the water level gauge 11 and the opening gauge 12 may be included in the abnormality detection device 40.

[0030] The evaluation value measuring unit 46 includes a plurality of strain gauges 461. The plurality of strain gauges 461 are attached to the plurality of pedestals 24, respectively. Each strain gauge 461 measures the strain of the pedestal 24 as a stress evaluation value. The strain of the pedestal 24 is a value indicating the stress acting on the pedestal 24. In the example of FIG. 1 and FIG. 2, one strain gauge 461 is provided on each pedestal 24, but a plurality of strain gauges 461 may be provided on each pedestal 24. FIG. 3 is a cross-sectional view showing the pedestal 24, and shows a cross section perpendicular to the longitudinal direction of the pedestal 24. In the example of FIG. 3, the pedestal 24 is formed of H-shaped steel, and strain gauges 461 are attached to the upper and lower parts of the inner surfaces facing each other at two parts extending in the vertical direction. When a plurality of strain gauges 461 are provided on each pedestal 24, for example, the average of the measured values ​​of these strain gauges 461 is the stress evaluation value.

[0031] The pedestal temperature measurement unit 47 includes a plurality of thermocouples 471. The plurality of thermocouples 471 are attached to the plurality of pedestals 24, respectively. Each thermocouple 471 measures the temperature of the pedestal 24. In the example of FIG. 1 and FIG. 2, the strain gauge 461 and the thermocouple 471 are disposed in close proximity to each other in each pedestal 24. They may be disposed at positions distant from each other. As with the strain gauge 461, two or more thermocouples 471 may be disposed in each pedestal 24. In this case, for example, the average of the measured values ​​by the two or more thermocouples 471 is treated as the temperature of the pedestal 24.

[0032] The water level gauge 11 is, for example, a float-type water level gauge, and measures the water level at the installation position of the radial gate 10 (i.e., the water level of the water in contact with the skin plate 21, hereinafter also simply referred to as the "water level") by detecting the position of a float floating on the water surface. In this embodiment, the water level is the height from the bottom of the dam to the water surface. The water level gauge 11 may be a sonic, ultrasonic or pressure type water level gauge that measures the water level without using a float. The opening degree gauge 12 detects the opening degree of the door body 2, for example, by using a wire separately attached to the door body 2. In the example of FIG. 1 and FIG. 2, the opening degree of the door body 2 is the height from the bottom surface 912 of the opening 91 (more precisely, the contact position of the watertight rubber) to the lower end of the skin plate 21. The opening degree gauge 12 may detect the opening degree of the door body 2 by using various sensors or the like.

[0033] FIG. 4 is a block diagram showing the configuration of the abnormality detection device 40. The abnormality detection device 40 detects an abnormality in the stud 24 in the radial gate 10. The abnormality detection device 40 includes an evaluation value measurement unit 46, a stud temperature measurement unit 47, a water level gauge 11, a judgment unit 41, and a memory unit 42. As described above, the evaluation value measurement unit 46 measures the stress evaluation value of the stud 24, and the stud temperature measurement unit 47 measures the temperature of the stud 24. The water level gauge 11 measures the water level of the radial gate 10. The judgment unit 41 judges whether or not there is an abnormality in each stud 24. The function of the judgment unit 41 is realized by the CPU of the computer 4 or the like executing a calculation process according to a predetermined program (i.e., the computer executing a program). The function of the judgment unit 41 may be realized by a dedicated electric circuit, or a dedicated electric circuit may be used partially. The memory unit 42 stores temperature-stress information 421 and water level-stress information 422, which will be described later. The storage unit 42 is realized, for example, by a memory or a fixed disk of the computer 4. The water level-stress information 422 is used in the embodiment described later.

[0034] FIG. 5 is a diagram showing a flow of processing in which the abnormality detection device 40 detects an abnormality in the legs 24. Blocks (steps S21, S22) shown by dashed lines in FIG. 5 are processes performed in a processing example described later, but are not performed in this processing example. In this embodiment, for example, when the lower end 213 of the skin plate 21 is in contact with the bottom surface 912 of the opening 91, that is, when the radial gate 10 is closed, the stress evaluation value of each leg 24 is measured by the evaluation value measurement unit 46 (step S11). In addition, the temperature of each leg 24 is measured by the leg temperature measurement unit 47 (step S12). The measured values ​​of the stress evaluation value and the measured temperature of each leg 24 are input to the judgment unit 41. Hereinafter, one leg 24 is called a "leg of interest 24", and the abnormality detection processing will be described focusing on the leg of interest 24, but similar processing is performed for the other legs 24.

[0035] Here, the temperature-stress information 421 stored in the storage unit 42 will be described. FIG. 6 is a diagram showing the temperature-stress information 421. The temperature-stress information 421 is information showing the relationship between a temperature-related value derived from the temperature of the target leg 24 and a normal value of the stress evaluation value of the target leg 24. In the example of FIG. 6, the temperature-related value is the temperature difference between the target leg 24 and another leg 24, and as shown by the solid line L11 in FIG. 6, the temperature-stress information 421 shows the relationship between the temperature difference and the normal value of the stress evaluation value of the target leg 24. The other leg 24 is, for example, one leg 24 included in the same plate support unit 22 as the target leg 24. Hereinafter, the combination of the target leg 24 and the other leg 24 is called a "leg pair."

[0036] During the daytime when the sun is strong, one of the strut pairs may be locally heated due to differences in sunlight, resulting in a large temperature difference between the two. For example, in the plate support section 22 on the left bank side shown in FIG. 7, when the upper strut 24 and the lower strut 24 are a strut pair, the temperature T UL is the temperature T of the lower leg 24 LL Higher than (T UL >T LL), as shown by arrows A1 and A2, the thermal expansion (amount of thermal expansion) of the upper leg 24 becomes larger than that of the lower leg 24. In reality, due to a geometric constraint, i.e., the presence of the skin plate 21, thermal stress occurs in both legs 24. Here, compressive stress occurs in the upper leg 24, and tensile stress occurs in the lower leg 24. As will be described later, when there is no slippage in the skin plate 21, compressive stress occurs in both legs 24. It is considered that the thermal stress changes linearly with respect to the temperature difference between the two.

[0037] The temperature-stress information 421 indicates the normal value of the stress evaluation value of the target leg 24, including the influence of thermal stress caused by the temperature difference between the leg pair. If an abnormality such as thinning occurs in any of the legs 24 included in the leg pair, the influence of thermal stress caused by the temperature difference will change, and as shown by the dashed line L21 in Fig. 6, the relationship between the temperature difference between the leg pair and the stress evaluation value of the target leg 24 will differ from the solid line L11.

[0038] The strut pair may be a combination of a target strut 24 and another strut 24 that faces the target strut 24 in the direction of the rotation axis J1. For example, the upper strut 24 on the left bank side plate support portion 22 and the upper strut 24 on the right bank side plate support portion 22 are a strut pair, and the temperature T UL is the temperature T of the right bank pillar 24 UR Different from (T UL ≠T UR In this case, as in the above example, thermal expansion differs between the pair of legs, and thermal stress occurs due to geometric constraints. The thermal stress is also considered to change linearly with respect to the temperature difference between the legs.

[0039] In the abnormality detection device 40, during a period when there is no abnormality in each stud 24 (for example, a predetermined period after the installation of the radial gate 10), the temperature difference between the stud pair at each time is acquired as a temperature-related value while the conditions such as the water level of the radial gate 10 are substantially constant, and the stress evaluation value of the target stud 24 at that time is measured as a normal value. As a result, for the target stud 24, temperature-stress information 421 indicating the relationship between the temperature-related value and the normal value of the stress evaluation value is acquired and prepared, as shown by the solid line L11 in FIG. 6. In the two studs 24 of the stud pair, it is preferable that the distance from the support part 23 (or the skin plate 21) to the thermocouple 471 is the same, that is, the temperature measurement position on the stud 24 is the same. The temperature-stress information 421 may be acquired by a numerical simulation or the like (similar to the water level-stress information 422).

[0040] The determination unit 41 uses the measured temperature value of the leg 24 in step S12 and refers to the temperature-stress information 421 to identify the normal value of the stress evaluation value of the leg 24 of interest (step S13). Specifically, the temperature difference of the leg pair including the leg 24 of interest is calculated, and the normal value of the stress evaluation value at the temperature difference is specified in the temperature-stress information 421 of FIG. 6. When the normal value of the stress evaluation value is specified, the measured value of the stress evaluation value of the leg 24 of interest in step S11 is compared with the normal value (step S14). For example, the difference between the measured stress evaluation value and the normal value is calculated, and if the absolute value of the difference is equal to or greater than a predetermined value, it is determined that one of the legs 24 included in the leg pair has an abnormality. If the absolute value of the difference is less than a predetermined value, it is determined that the leg pair has no abnormality. In this way, the determination unit 41 determines whether or not there is an abnormality in the leg pair. The determination of the presence or absence of an abnormality may be performed by other methods.

[0041] If an abnormality is found in the strut pair, the computer 4 displays a message indicating the abnormality to notify the operator. The occurrence of an abnormality may be notified by turning on a light, sounding a buzzer, or sending a notification to an information communication terminal using e-mail or the like. In the abnormality detection device 40, the processes of steps S11 to S14 may be repeated at regular intervals, or may be performed when a specified operation is performed or at any timing determined by the operator. The abnormality detection process can also be performed under severe conditions such as during flood seasons or between one regular inspection and the next.

[0042] In the above processing example, the thermal stress caused by the temperature difference between the legs is described. However, in the case where the temperature difference between the legs is less than a predetermined value, such as at night, there is no temperature difference between the legs (for example, T UL =T LL ), thermal stress occurs due to the influence of the surrounding temperature change. Specifically, when a temperature change occurs over time, thermal expansion (including contraction) occurs in each leg 24, but as described above, watertight rubber is provided on each side 211 and bottom end 213 of the skin plate 21, and the thermal expansion of the leg 24 is restricted by friction between the watertight rubber and the opening side surface 911 and bottom surface 912 of the opening 91 (i.e., the skin plate 21 does not slip). As a result, thermal stress occurs in each leg 24 due to the influence of the surrounding temperature change. It is considered that the thermal stress changes linearly with the temperature of the leg 24.

[0043] Therefore, when there is no temperature difference between the runner pairs, the temperature of the runner of interest 24 is used as the temperature-related value, and temperature-stress information 421 is used, which indicates the relationship between the temperature of the runner of interest 24 and the normal value of the stress evaluation value of the runner of interest 24, as shown by the solid line L12 in Fig. 8. If an abnormality such as thinning occurs in the runner of interest 24, the relationship between the temperature of the runner of interest 24 and the stress evaluation value of the runner of interest 24 will differ from the solid line L12, as shown by the dashed line L22 in Fig. 8.

[0044] When acquiring the temperature-stress information 421 in Figure 8, during a period when there are no abnormalities in each leg column 24, when conditions such as the water level in the radial gate 10 are approximately constant and there is no temperature difference between the leg column pairs, the temperature of the leg column of interest 24 at each time is acquired as a temperature-related value, and the stress evaluation value of the leg column of interest 24 at that time is measured as a normal value.

[0045] In the abnormality detection process of Fig. 5, after measuring the stress evaluation value and temperature of each leg 24 (steps S11, S12), the judgment unit 41 checks whether the temperature difference between the leg pair is less than a predetermined value. If the temperature difference between the leg pair is less than the predetermined value, the normal value of the stress evaluation value at the temperature of the target leg 24 is specified in the temperature-stress information 421 of Fig. 8 (step S13). If the temperature difference between the leg pair is equal to or greater than the predetermined value, the normal value of the stress evaluation value at the temperature difference between the leg pair is specified in the temperature-stress information 421 of Fig. 6 (step S13). Then, the measured value of the stress evaluation value of the target leg 24 is compared with the normal value to judge whether there is an abnormality in the leg 24 (step S14).

[0046] In addition, the determination unit 41 may perform processing using the temperature-stress information 421 in Fig. 6 during the day when a temperature difference is likely to occur in the leg pair, and may perform processing using the temperature-stress information 421 in Fig. 8 during the night when a temperature difference is unlikely to occur in the leg pair. When no temperature difference occurs in the leg pair, the temperature of a thermometer (a thermometer different from the above-mentioned thermocouple 471) provided in the radial gate 10 may be treated as the temperature of the leg 24 of interest. In this case, the thermometer becomes a leg temperature measurement unit that measures the temperature of the leg 24 of interest.

[0047] As described above, in the abnormality detection device 40, one of the multiple legs 24 is designated as the target leg 24, and the stress evaluation value indicating the stress acting on the target leg 24 is measured by the evaluation value measurement unit 46, and the temperature of the target leg 24 is measured by the leg temperature measurement unit 47. The storage unit 42 stores temperature-stress information 421 indicating the relationship between the temperature-related value derived from the temperature of the target leg 24 and the normal value of the stress evaluation value of the target leg 24. The determination unit 41 specifies the normal value of the stress evaluation value of the target leg 24 by referring to the temperature-stress information 421 using the temperature measurement value of the target leg 24 by the leg temperature measurement unit 47. Then, the presence or absence of an abnormality in the leg 24 is determined by comparing the measurement value of the stress evaluation value of the target leg 24 by the evaluation value measurement unit 46 with the normal value. This allows the abnormality of the leg 24 to be appropriately detected taking into account the temperature of the leg 24.

[0048] Preferably, the temperature of two or more legs 24 including the target leg 24 is measured individually by the leg temperature measuring unit 47. A temperature-related value is derived from the temperatures of the two legs 24 including the target leg 24. The determining unit 41 uses the measured temperature values ​​of the two legs 24 to identify the normal value of the stress evaluation value of the target leg 24. This makes it possible to accurately identify the normal value of the stress evaluation value of the target leg 24 using the temperatures of the two legs 24, and to more appropriately detect an abnormality in the leg 24. It is more preferable that the temperature-related value is the temperature difference between the two legs 24 including the target leg 24, and this makes it possible to easily and accurately identify the normal value of the stress evaluation value of the target leg 24.

[0049] (Second embodiment) Next, an abnormality detection process according to a second embodiment of the present invention will be described. In the second embodiment, the normal value of the stress evaluation value of the target pedestal 24 is specified using the water level of the radial gate 10 as well. Specifically, the storage unit 42 of the abnormality detection device 40 stores a plurality of temperature-stress information 421 corresponding to a plurality of water level divisions. The temperature-stress information 421 of each water level division indicates the relationship between the temperature-related value when the water level of the radial gate 10 is within the water level division and the normal value of the stress evaluation value of the target pedestal 24. As described above, the water level of the radial gate 10 can be measured by the water level gauge 11, and the temperature-stress information 421 of each water level division is acquired by measuring the temperature and stress evaluation value of the pedestal 24 during the period when the measurement value by the water level gauge 11 is within the water level division.

[0050] When temperature-stress information 421 for a plurality of water level divisions is prepared, the process of the blocks indicated by the broken lines in the abnormality detection process in FIG. 5 (steps S21, S22) is performed. Specifically, first, the stress evaluation value and temperature of each pedestal 24 are measured (steps S11, S12), and the water level of the radial gate 10 is measured by the water level gauge 11 (step S21). The judgment unit 41 selects the temperature-stress information 421 for the water level division including the measured value of the water level from the temperature-stress information 421 for a plurality of water level divisions (step S22). Next, in the selected temperature-stress information 421, the normal value of the stress evaluation value in the temperature-related value derived from the measured value of the temperature of the target pedestal 24 is specified (step S13). Then, the measured value of the stress evaluation value of the target pedestal 24 is compared with the normal value to judge whether or not there is an abnormality (step S14).

[0051] As described above, in the abnormality detection device 40, a plurality of pieces of temperature-stress information 421 indicating the relationship between the temperature-related value and the normal value of the stress evaluation value at a plurality of water levels are stored in the memory unit 42. In the determination unit 41, the temperature-stress information 421 to be used for identifying the normal value of the stress evaluation value is selected from the plurality of pieces of temperature-stress information 421 using the water level measurement value by the water level gauge 11. This makes it possible to accurately detect an abnormality in the leg 24 using the measurement values ​​of the temperature and water level of the leg 24.

[0052] The abnormality detection device 40 may store a three-dimensional graph showing the relationship between the water level, the temperature-related value, and the normal value of the stress evaluation value. The three-dimensional graph is also essentially regarded as a plurality of temperature-stress information 421 showing the relationship between the temperature-related value and the normal value of the stress evaluation value at a plurality of water levels. Depending on the design of the abnormality detection device 40, only the temperature-stress information 421 for one water level division may be prepared, and the abnormality detection process may be performed only when the measured water level of the radial gate 10 is included in that water level division.

[0053] (Related Technology) Next, the water level-stress information 422 will be described. As shown by the solid line L13 in Fig. 9, the water level-stress information 422 indicates the relationship between the water level of the radial gate 10 and the normal value of the stress evaluation value of the target leg 24. A water pressure according to the water level acts on the skin plate 21 of the radial gate 10, and the water level-stress information 422 indicates the normal value of the stress evaluation value of the target leg 24, including the influence of the stress caused by the water level. During a period when there is no abnormality in each leg 24, the water level of the radial gate 10 is measured at each time when the conditions of the leg 24, such as the temperature, are approximately constant, and the stress evaluation value (normal value) of the target leg 24 at that time is measured, thereby acquiring the water level-stress information 422.

[0054] 10A and 10B are diagrams showing the results of a numerical simulation using the finite element method to determine the relationship between the water level of the radial gate 10 and the stresses of the multiple piers 24. Here, two piers 24 (upper and lower piers 24) are provided on each of the plate support section 22 on the left bank side and the plate support section 22 on the right bank side. When there is no abnormality in the multiple piers 24, the relationship between the upper pier 24 on the left bank side and the upper pier 24 on the right bank side is shown by the same line L31 in FIG. 10A, and the relationship between the lower pier 24 on the left bank side and the lower pier 24 on the right bank side is shown by the same line L32.

[0055] On the other hand, when the rigidity of one of the piers 24, specifically the upper pier 24 on the right bank side, is reduced, the above relationship between the upper pier 24 and the lower pier 24 on the left bank side is shown by lines L41 and L42 in FIG. 10B, and the above relationship between the upper pier 24 and the lower pier 24 on the right bank side is shown by lines L51 and L52 in FIG. 10B. As is clear from line L31 in FIG. 10A and line L51 in FIG. 10B, in the upper pier 24 on the right bank side, whose rigidity is reduced, the stress changes significantly from a state without abnormality. Therefore, even in the example of FIG. 9, if an abnormality such as thinning occurs in the target pier 24, the relationship between the water level and the stress evaluation value of the target pier 24 will be different from the solid line L13, as shown by the dashed line L23 in FIG. 9.

[0056] The abnormality detection device 40 can also perform abnormality detection processing using only the water level-stress information 422. In this case, first, the stress evaluation value of the target pedestal 24 and the water level of the radial gate 10 are measured (steps S11, S21). The judgment unit 41 uses the measured water level value and refers to the water level-stress information 422 to identify the normal value of the stress evaluation value of the target pedestal 24 (step S13). After that, the measured stress evaluation value of the target pedestal 24 is compared with the normal value to judge the presence or absence of an abnormality in the target pedestal 24 (step S14).

[0057] In the above-mentioned anomaly detection process, the normal value of the stress evaluation value of the target pedestal 24 may be specified using the temperature of the target pedestal 24 as well. In this case, the storage unit 42 of the anomaly detection device 40 stores a plurality of water level-stress information 422 corresponding to a plurality of temperature divisions. The water level-stress information 422 of each temperature division indicates the relationship between the water level when the temperature of the target pedestal 24 is within the corresponding temperature division and the normal value of the stress evaluation value of the target pedestal 24. The water level-stress information 422 of each temperature division is acquired by measuring the water level and the stress evaluation value of the radial gate 10 during the period when the temperature of the target pedestal 24 is within the corresponding temperature division.

[0058] In the abnormality detection process when water level-stress information 422 for a plurality of temperature sections is prepared, first, the stress evaluation value and temperature of the target pedestal 24 and the water level of the radial gate 10 are measured (steps S11, S12, S21). The judgment unit 41 selects water level-stress information 422 for a temperature section including the measured temperature value of the target pedestal 24 from the water level-stress information 422 for a plurality of temperature sections (step S22). Next, in the selected water level-stress information 422, the normal value of the stress evaluation value for the measured water level is specified (step S13). Then, the measured stress evaluation value of the target pedestal 24 is compared with the normal value to judge the presence or absence of an abnormality (step S14).

[0059] As described above, in the abnormality detection device 40, a plurality of pieces of water level-stress information 422 at a plurality of temperatures are stored in the memory unit 42. In the judgment unit 41, the water level-stress information 422 to be used for identifying the normal value of the stress evaluation value is selected from the plurality of pieces of water level-stress information 422 using the measured value of the temperature of the target leg 24. This makes it possible to accurately detect an abnormality in the leg 24 using the measured values ​​of the temperature and water level of the target leg 24.

[0060] The storage unit 42 may store a plurality of pieces of water level-stress information 422 for a plurality of temperature difference categories. In this case, the water level-stress information 422 used to specify the normal value of the stress evaluation value is selected using the temperature difference between the stud pair. In this manner, the plurality of pieces of water level-stress information 422 may correspond to a plurality of temperature-related value categories. Depending on the design of the anomaly detection device 40, only the water level-stress information 422 for one temperature-related value category may be prepared, and the above anomaly detection process may be performed only when the temperature-related value derived from the measured temperature of the target stud 24 is included in the temperature-related value category.

[0061] (Third embodiment) Next, an abnormality detection process according to a third embodiment of the present invention will be described. In the third embodiment, both temperature-stress information 421 and water level-stress information 422 are stored and prepared for each leg 24 in the storage unit 42. The temperature-stress information 421 indicates the relationship between the temperature-related value and the normal value of the stress evaluation value at a certain water level (hereinafter referred to as the "reference water level"). The water level-stress information 422 indicates the relationship between the water level and the normal value of the stress evaluation value at a certain temperature-related value (hereinafter referred to as the "reference temperature-related value"). It should be noted that the reference water level may include a certain degree of water level width. The same applies to the reference temperature-related value.

[0062] The abnormality detection device 40 measures the stress evaluation value and temperature of each strut 24 (steps S11, S12), and measures the water level of the radial gate 10 (step S21). The judgment unit 41 acquires the difference α1 between the normal stress evaluation value at the reference water level V0 and the normal stress evaluation value at the measured water level V1 as a correction amount in the water level-stress information 422 shown in Fig. 11 (step S22). In the example of Fig. 11, the normal stress evaluation value at the measured water level V1 is greater than the normal stress evaluation value at the reference water level V0, so the correction amount α1 is a positive value.

[0063] Next, in the temperature-stress information 421, a normal value of the stress evaluation value in the temperature-related value derived from the measured value of the temperature of the target pedestal 24 is specified (step S13). In the temperature-stress information 421 shown in FIG. 12, the normal value of the stress evaluation value is specified as σ1. Then, the measured value of the stress evaluation value of the target pedestal 24 and the normal value σ1 are used to determine whether or not there is an abnormality (step S14). At this time, the measured value of the stress evaluation value is corrected using a correction amount α1. For example, as shown in FIG. 12, the corrected measured value E2 is obtained by subtracting the correction amount α1 from the measured value E1 of the stress evaluation value. In the corrected measured value E2, the influence of the fluctuation of the stress evaluation value caused by the difference between the reference water level V0 and the current water level (measured water level V1) is reduced. Then, the corrected measured value E2 of the target pedestal 24 is compared with the normal value σ1 to determine whether or not there is an abnormality. In determining whether or not there is an abnormality, the normal value of the stress evaluation value may be corrected by adding a correction amount α1 to the normal value, and the measured value E1 of the stress evaluation value (the uncorrected measured value) may be compared with the corrected normal value.

[0064] As described above, in the judgment unit 41 of the abnormality detection device 40, a correction amount corresponding to the difference between the measured value of the water level by the water level meter 11 and the reference water level is acquired from the water level-stress information 422. In addition, the normal value of the stress evaluation value of the target leg 24 is specified by referring to the temperature-stress information 421 using the measured value of the temperature of the target leg 24. Then, in comparing the measured value of the stress evaluation value of the target leg 24 with the normal value, the measured value or the normal value is corrected using the above correction amount. In this way, an abnormality in the leg 24 can be detected with high accuracy using the measured values ​​of the temperature and water level of the target leg 24. The correction amount may be a ratio between the normal value of the stress evaluation value at the reference water level V0 and the normal value of the stress evaluation value at the measured value of the water level V1. In addition, in correcting the measured value or the normal value, the measured value or the normal value may be multiplied or divided by the correction amount.

[0065] (Fourth embodiment) Next, an abnormality detection process according to the fourth embodiment of the present invention will be described. In the fourth embodiment, the correction amount is obtained from the temperature-stress information 421. In this case, in the temperature-stress information 421 shown in FIG. 13, the judgment unit 41 acquires the difference α2 between the normal value of the stress evaluation value at the reference temperature-related value T0 and the normal value of the stress evaluation value at the temperature-related value T1 derived from the measured value of the temperature of the target pedestal 24 as the correction amount (step S22). Next, in the water level-stress information 422, the normal value of the stress evaluation value at the measured value of the water level is specified (step S13). In the water level-stress information 422 shown in FIG. 14, the normal value of the stress evaluation value is specified as σ2. Then, the measured value E3 of the stress evaluation value of the target pedestal 24 and the normal value σ2 are used to judge whether or not an abnormality exists (step S14). At this time, as shown in FIG. 14, the measured value E3 of the stress evaluation value is corrected using the correction amount α2, and the corrected measured value E4 is obtained. Then, the corrected measurement value E4 of the target leg 24 is compared with the normal value σ2 to determine whether or not there is an abnormality. Similarly to the above, the normal value σ2 of the stress evaluation value may be corrected using the correction amount α2.

[0066] As described above, in the judgment unit 41 of the abnormality detection device 40, a correction amount corresponding to the difference between the temperature-related value derived from the measured temperature of the target leg 24 and the reference temperature-related value is obtained from the temperature-stress information 421. Furthermore, the normal value of the stress evaluation value of the target leg 24 is specified by referring to the water level-stress information 422 using the measured water level value by the water level gauge 11. Then, in comparing the measured stress evaluation value of the target leg 24 with the normal value, the measured value or the normal value is corrected using the correction amount. As a result, an abnormality in the target leg 24 can be detected with high accuracy using the measured temperature and water level values ​​of the target leg 24.

[0067] The abnormality detection device 40 and the abnormality detection method described above can be modified in various ways.

[0068] In comparing the measured stress evaluation value with the normal value in the determination unit 41, a group of measured values ​​in a time series (multiple times) may be compared with a group of normal values ​​corresponding to the measured value group. For example, a group of measured stress evaluation values ​​is obtained during a time period when the temperature changes significantly, and a group of normal stress evaluation values ​​is obtained based on a group of measured temperature values ​​obtained by the column temperature measurement unit 47. Then, the gradient of the measured value obtained from the group of measured stress evaluation values ​​is compared with the gradient of the normal value obtained from the group of normal values, and if the gradient difference is equal to or greater than a predetermined value, it is determined that there is an abnormality. Of course, a value other than the gradient may be used.

[0069] In the above embodiment, various measurements are performed with the radial gate 10 closed, but various measurements may be performed with the radial gate 10 open. In this case, preferably, a plurality of temperature-stress information 421 for a plurality of opening divisions is prepared, and in determining the presence or absence of an abnormality, the temperature-stress information 421 corresponding to the actual opening detected by the opening meter 12 is selected and used to specify the normal value. Similarly, a plurality of water level-stress information 422 for a plurality of opening divisions may be prepared, and in specifying the normal value, the water level-stress information 422 corresponding to the actual opening may be selected.

[0070] The temperature-related value may be something other than the temperature of the target leg 24 and the temperature difference between the pair of legs. For example, in a leg group including the target leg 24 and two other legs 24, the temperature difference between the target leg 24 and each of the other two legs 24 (i.e., two temperature differences) may be the temperature-related value. In this case, in the temperature-stress information 421 showing the relationship between the temperature-related value and the normal value of the stress evaluation value (for example, a three-dimensional graph showing the relationship between the two temperature differences and the normal value of the stress evaluation value), the normal value of the stress evaluation value of the target leg 24 is specified using the measured temperature values ​​of the three legs 24 included in the leg group. Also, the number of legs 24 included in the leg group may be four or more.

[0071] As described above, in the abnormality detection device 40, the stud temperature measurement unit 47 individually measures the temperatures of two or more studs 24 including the target stud 24, and a temperature-related value is derived from the temperatures of the two or more studs 24. Then, the determination unit 41 uses the measured temperatures of the two or more studs 24 to identify the normal value of the stress evaluation value of the target stud 24. This makes it possible to accurately identify the normal value of the stress evaluation value of the target stud 24 using the temperatures of the two or more studs 24.

[0072] In the evaluation value measurement unit 46, a device other than the strain gauge 461 may be used as long as a value substantially indicating the stress acting on the pedestal 24 can be acquired. For example, a configuration that measures the distance between two specific points (fixed-point distance) on the pedestal 24 using a length measuring device or a camera, or a configuration that measures the stress acting on the pedestal 24 using an infrared camera may be used as the evaluation value measurement unit 46. Also, in the pedestal temperature measurement unit 47, a device other than the thermocouple 471 may be used, and for example, the temperature of the pedestal 24 may be measured using a thermo camera, etc.

[0073] The configurations in the above-described embodiment and each of the modified examples may be combined as appropriate as long as they are not mutually inconsistent. [Explanation of symbols]

[0074] 10 Radial Gate 11 Water level gauge 21 Skin Plate 24 Pillars 40 Anomaly detection device 41 Judgment section 42 Storage section 46 Evaluation value measurement unit 47 Pillar temperature measurement section 421 Temperature-Stress Information 422 Water Level-Stress Information S11~S14, S21, S22 steps

Claims

1. An abnormality detection device for detecting an abnormality in a strut in a radial gate in which a skin plate is supported by a plurality of struts, comprising: an evaluation value measurement unit that measures a stress evaluation value indicating a stress acting on a target leg, the stress evaluation value being determined by determining a target leg from among the plurality of legs; A stud temperature measuring unit for measuring the temperature of the stud of interest; A storage unit for storing temperature-stress information indicating a relationship between a temperature-related value derived from the temperature of the target leg and a normal value of the stress evaluation value of the target leg; a determination unit that uses the temperature measurement value of the target leg by the leg temperature measurement unit to refer to the temperature-stress information to identify a normal value of the stress evaluation value of the target leg, and determines the presence or absence of an abnormality by comparing the measurement value of the stress evaluation value of the target leg by the evaluation value measurement unit with the normal value; An abnormality detection device comprising:

2. The abnormality detection device according to claim 1 , The leg temperature measuring unit measures temperatures of two or more legs including the target leg individually, the temperature-related value is derived from temperatures of the two or more pedestals; An abnormality detection device in which the judgment unit identifies the normal value of the stress evaluation value of the target runner using the measured temperature values ​​of the two or more runners.

3. The abnormality detection device according to claim 2, An anomaly detection device, wherein the temperature-related value is a temperature difference between two legs including the leg of interest.

4. 4. The abnormality detection device according to claim 1, Further comprising a water level meter for measuring the water level of the radial gate; The memory unit stores a plurality of pieces of temperature-stress information indicating the relationship at a plurality of water levels; An abnormality detection device in which the judgment unit selects the temperature-stress information to be used to identify the normal value from the multiple pieces of temperature-stress information using the water level measurement value from the water level gauge.

5. 4. The abnormality detection device according to claim 1, Further comprising a water level meter for measuring the water level of the radial gate; the temperature-stress information indicating the relationship at a constant water level; the storage unit stores water level-stress information indicating a relationship between the water level of the radial gate and a normal value of the stress evaluation value of the target pier; The abnormality detection device wherein the judgment unit obtains a correction amount corresponding to the difference between the water level measurement value by the water level meter and the constant water level from the water level-stress information, and when comparing the measured value of the stress evaluation value of the target leg with the normal value, uses the correction amount to correct the measured value or the normal value.

6. An abnormality detection device for detecting an abnormality in a strut in a radial gate in which a skin plate is supported by a plurality of struts, comprising: an evaluation value measurement unit that measures a stress evaluation value indicating a stress acting on a target leg, the stress evaluation value being determined by determining a target leg from among the plurality of legs; A stud temperature measuring unit for measuring the temperature of the stud of interest; A water level meter for measuring the water level of the radial gate; a storage unit that stores water level-stress information indicating a relationship between the water level of the radial gate and a normal value of the stress evaluation value of the target pier; a determination unit which identifies a normal value of the stress evaluation value of the target leg by referring to the water level-stress information using the water level measurement value from the water level gauge, and determines the presence or absence of an abnormality by comparing the measurement value of the stress evaluation value of the target leg by the evaluation value measurement unit with the normal value; Equipped with the storage unit stores temperature-stress information indicating a relationship between a temperature-related value derived from the temperature of the target pedestal and a normal value of the stress evaluation value of the target pedestal; the water level-stress information corresponds to a constant temperature related value; The abnormality detection device in which the judgment unit obtains a correction amount corresponding to the difference between a temperature-related value derived from the measured value of the temperature of the target leg from the temperature-stress information and the constant temperature-related value, and when comparing the measured value of the stress evaluation value of the target leg with the normal value, uses the correction amount to correct the measured value or the normal value.

7. A method for detecting an abnormality in a strut in a radial gate in which a skin plate is supported by a plurality of struts, comprising the steps of: a) determining a target leg among the plurality of legs as a target leg and measuring a stress evaluation value indicating a stress acting on the target leg; b) measuring the temperature of the target pedestal; c) temperature-stress information indicating the relationship between a temperature-related value derived from the temperature of the target pedestal and a normal value of the stress evaluation value of the target pedestal is prepared in advance, and the normal value of the stress evaluation value of the target pedestal is specified by referring to the temperature-stress information using the measured value of the temperature of the target pedestal in the b) step; d) determining whether or not there is an abnormality by comparing the measured stress evaluation value of the target pedestal in the step a) with the normal value; The anomaly detection method includes:

8. A method for detecting an abnormality in a strut in a radial gate in which a skin plate is supported by a plurality of struts, comprising the steps of: a) determining a target leg among the plurality of legs as a target leg and measuring a stress evaluation value indicating a stress acting on the target leg; b) measuring the temperature of the target pedestal; c) measuring the water level of the radial gate; d) water level-stress information indicating the relationship between the water level of the radial gate and the normal value of the stress evaluation value of the target pier is prepared in advance, and the normal value of the stress evaluation value of the target pier is specified by referring to the water level-stress information using the water level measurement value in the c) step; e) determining whether or not there is an abnormality by comparing the measured stress evaluation value of the target pedestal in the step a) with the normal value; Equipped with Temperature-stress information is prepared in advance, which indicates a relationship between a temperature-related value derived from the temperature of the target pedestal and a normal value of the stress evaluation value of the target pedestal; the water level-stress information corresponds to a constant temperature related value; a correction amount corresponding to a difference between a temperature-related value derived from measurements of the temperature of the pedestal of interest and the constant temperature-related value is obtained from the temperature-stress information; An anomaly detection method in which, in the step e), the measured stress evaluation value of the target pedestal is compared with the normal value, and the measured stress evaluation value or the normal value is corrected using the correction amount.

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