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公开(公告)号：US11913895B2
公开(公告)日：2024-02-27
申请号：US15734654
申请日：2019-05-28
摘要： To easily detect a crack having occurred in a steel material. A current measurement device measures a value of a current flowing through a target steel material that is immersed in an electrolyte aqueous solution and applied with tensile stress while subjected to hydrogen charging, and a device for detecting the occurrence of a crack or the like uses the measured current value to determine the occurrence of a crack in the target steel material when the amount of change in the current flowing through the target steel material, the change rate of the amount of change in the current, or the change rate of the change rate of the amount of change in the current exceeds a threshold value. The device for detecting the occurrence of a crack or the like determines the occurrence of a crack in the steel material when the change rate of the change rate of the amount of change in the current is less than a negative value of an absolute value of the threshold value, and determines the occurrence of fracture in the steel material when the change rate exceeds the absolute value of the threshold value.
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公开(公告)号：US20220252490A1
公开(公告)日：2022-08-11
申请号：US17618369
申请日：2019-06-26
发明人： Takuya Kamisho , Ryuta Ishii , Yosuke Takeuchi , Masayuki Tsuda
摘要： Provided is a method for evaluating a hydrogen embrittlement fracture risk of an iron reinforcing bar that is performed by a hydrogen embrittlement fracture risk evaluation apparatus, the method including: a fracture probability curved surface generation step of obtaining a fracture probability curved surface representing a probability of the iron reinforcing bar fracturing by performing regression analysis on results obtained by repeatedly carrying out a hydrogen embrittlement test while changing an amount of hydrogen absorbed in the iron reinforcing bar provided in a concrete structure and a tensile stress applied to the iron reinforcing bar and using the amount of hydrogen and the tensile stress as variables; a lower limit stress acquisition step of acquiring, from the fracture probability curved surface, a lower limit stress property representing a relationship between a lower limit stress that is a lower limit of the tensile stress at which no fracture occurs in the iron reinforcing bar at a predetermined probability and the amount of hydrogen; and an evaluation step.
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公开(公告)号：US12031331B2
公开(公告)日：2024-07-09
申请号：US17431953
申请日：2020-02-14
发明人： Yosuke Takeuchi , Ryuta Ishii , Takuya Kamisho , Masayuki Tsuda
IPC分类号： E04C5/00 , C04B14/48 , C04B22/06 , E04C3/34 , E04C5/01 , C04B103/61 , C04B111/26
CPC分类号： E04C5/015 , C04B14/48 , C04B22/064 , E04C3/34 , C04B2103/61 , C04B2111/26
摘要： Reinforced concrete is protected from corrosion without conducting an operation involving exposure of rebar. A reinforced concrete structure is provided with a storage part that is formed inside concrete of the reinforced concrete structure, and that retains an anticorrosion solution. The anticorrosion solution diffuses and permeates through the concrete from the storage part, prevents the concrete in the vicinity of rebar from drying, and passivates the rebar.
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公开(公告)号：US20220283052A1
公开(公告)日：2022-09-08
申请号：US17637730
申请日：2019-08-27
发明人： Ryuta Ishii , Takuya Kamisho , Yosuke Takeuchi , Masayuki Tsuda
IPC分类号： G01M5/00
摘要： A composition ratio calculating unit configured to calculate a first composition ratio that is a ratio of substance quantities of rust collected from a broken surface of internal steel of an updated old concrete structure and a second composition ratio that is a ratio of substance quantities of rust collected from a surface different from the broken surface, a composition ratio calculating unit configured to calculate a first corrosion time corresponding to the first composition ratio and a second corrosion time corresponding to the second composition ratio from characteristics representing a relation between a first corrosion time and the first composition ratio and a relation between a second corrosion time and the second composition ratio, respectively, and a breaking time calculating unit configured to calculate a time for the internal steel to break by subtracting the first corrosion time from the second corrosion time are included.
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公开(公告)号：US20220145475A1
公开(公告)日：2022-05-12
申请号：US17431332
申请日：2020-02-06
发明人： Yosuke Takeuchi , Takuya Kamisho , Shingo Mineta , Masayuki Tsuda
摘要： Provided is an anticorrosion device that does not require the installation of electrical equipment and has no concern about loss of anticorrosion effect due to deterioration of the anode. An anticorrosion device that prevents corrosion of a metal material in a structure, including a thermoelectric power generation unit 10 configured to generate an electromotive force due to a temperature gradient, an anode unit 20 that is responsible for an anode reaction corresponding to the electromotive force, and a cathode unit 30 that is responsible for a cathode reaction corresponding to the electromotive force, in which the cathode unit 30 is a metal material (target metal) in the structure.
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公开(公告)号：US11946856B2
公开(公告)日：2024-04-02
申请号：US17053565
申请日：2019-04-24
IPC分类号： G01N17/00 , G01N33/2045
CPC分类号： G01N17/006 , G01N33/2045
摘要： To estimate a fracture starting point of steel due to hydrogen embrittlement with high accuracy. A steel fracture starting point estimation device includes a hydrogen concentration distribution calculation unit adapted to calculate a hydrogen concentration distribution in steel-to-be-estimated when the steel fractures due to hydrogen embrittlement; a local critical hydrogen content calculation unit adapted to calculate critical hydrogen content at which the steel-to-be-estimated fractures due to hydrogen embrittlement; and a fracture starting point estimation unit adapted to read the hydrogen concentration distribution out of a storage unit. To estimate, calculate, from the hydrogen concentration distribution, a location in the steel in which hydrogen concentration of the critical hydrogen content is distributed, and designate the location in the steel as the fracture starting point of the steel-to-be-estimated.
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公开(公告)号：US11852565B2
公开(公告)日：2023-12-26
申请号：US17637730
申请日：2019-08-27
发明人： Ryuta Ishii , Takuya Kamisho , Yosuke Takeuchi , Masayuki Tsuda
IPC分类号： G01M5/00
CPC分类号： G01M5/0033
摘要： A composition ratio calculating unit configured to calculate a first composition ratio that is a ratio of substance quantities of rust collected from a broken surface of internal steel of an updated old concrete structure and a second composition ratio that is a ratio of substance quantities of rust collected from a surface different from the broken surface, a composition ratio calculating unit configured to calculate a first corrosion time corresponding to the first composition ratio and a second corrosion time corresponding to the second composition ratio from characteristics representing a relation between a first corrosion time and the first composition ratio and a relation between a second corrosion time and the second composition ratio, respectively, and a breaking time calculating unit configured to calculate a time for the internal steel to break by subtracting the first corrosion time from the second corrosion time are included.
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公开(公告)号：US20220301150A1
公开(公告)日：2022-09-22
申请号：US17624888
申请日：2019-07-11
发明人： Yosuke Takeuchi , Ryuta Ishii , Takuya Kamisho , Masayuki Tsuda
摘要： An estimation device has: determination unit for acquiring a characteristic color of reinforced concrete in a dry state from an initial image obtained by capturing an image of a concrete surface of the concrete, analyzing a first image of the concrete surface that is captured after spraying water onto the reinforced concrete, and determining a portion having a predetermined color difference from the characteristic color as a crack; and an estimation unit for impregnating the crack with water, analyzing a second image of the concrete surface that is captured after the concrete surface is dried, and estimating whether or not the inside of the crack is carbonated, using a color around the crack.
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公开(公告)号：US20210318228A1
公开(公告)日：2021-10-14
申请号：US17265106
申请日：2019-06-28
发明人： Yosuke Takeuchi , Takashi Miwa , Takuya Kamisho , Soichi Oka
IPC分类号： G01N17/00 , G01N33/2045
摘要： An accelerated corrosion test apparatus that accelerates corrosion of reinforcing steel contained in reinforced concrete specimen having cracking includes: a moisture sensor disposed near the reinforcing steel exposed from a cracked portion of concrete; a weight measuring instrument that measures a weight of the reinforced concrete specimen; and a control terminal that is connected both to the moisture sensor and to the weight measuring instrument and controls a temperature and humidity control device, thereby alternately and repeatedly performing a wetting step of supplying moisture to the inside of a crack in the cracked concrete, and a drying step of removing moisture in the inside of the crack and moisture on the exposed surface of the reinforcing steel, wherein the control terminal terminates the wetting step and starts the drying step when moisture is detected in the moisture sensor, or when change in slope of weight change of the reinforced concrete specimen is detected, after the start of the wetting step.
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公开(公告)号：US20210293694A1
公开(公告)日：2021-09-23
申请号：US17258381
申请日：2019-06-28
发明人： Yosuke Takeuchi , Azusa Ishii , Takuya Kamisho , Soichi Oka
IPC分类号： G01N17/02 , G01N27/28 , G01N27/416 , G01N1/32
摘要： A test time for measuring hydrogen diffusion in a steel material is improved. The reproducibility of a position where hydrogen exists in the steel material is improved. A control terminal controls a solution supply/discharge control device, a gas supply control device, a first potentiostat/galvanostat, and a second potentiostat/galvanostat on the basis of a predefined procedure, so that a plurality of processing steps, which are performed for analyzing hydrogen diffused from the inside to the surface of a steel material to be measured, are performed continuously. Further, the processing of inactivating the surface of the steel material to be measured is performed before the main processing using a metal ion replacement method, or an inert gas is injected into the solution during the main processing.
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