公开(公告)号：US12031331B2

公开(公告)日：2024-07-09

申请号：US17431953

申请日：2020-02-14

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Ryuta Ishii ,  Takuya Kamisho ,  Masayuki Tsuda

IPC: E04C5/00 ,  C04B14/48 ,  C04B22/06 ,  E04C3/34 ,  E04C5/01 ,  C04B103/61 ,  C04B111/26

CPC classification number: E04C5/015 ,  C04B14/48 ,  C04B22/064 ,  E04C3/34 ,  C04B2103/61 ,  C04B2111/26

Abstract: 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.

公开(公告)号：US20220283052A1

公开(公告)日：2022-09-08

申请号：US17637730

申请日：2019-08-27

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Ryuta Ishii ,  Takuya Kamisho ,  Yosuke Takeuchi ,  Masayuki Tsuda

IPC: G01M5/00

Abstract: 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.

公开(公告)号：US20220145475A1

公开(公告)日：2022-05-12

申请号：US17431332

申请日：2020-02-06

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Takuya Kamisho ,  Shingo Mineta ,  Masayuki Tsuda

IPC: C23F13/22 ,  C23F13/12

Abstract: 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.

公开(公告)号：US11867609B2

公开(公告)日：2024-01-09

申请号：US17265106

申请日：2019-06-28

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Takashi Miwa ,  Takuya Kamisho ,  Soichi Oka

IPC: G01N17/00 ,  G01N33/2045 ,  G01N33/38

CPC classification number: G01N17/006 ,  G01N33/2045

Abstract: An accelerated corrosion test apparatus 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.

公开(公告)号：US20220137022A1

公开(公告)日：2022-05-05

申请号：US17431571

申请日：2020-02-06

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Takuya Kamisho ,  Masayuki Tsuda

IPC: G01N33/2045 ,  G01N17/00

Abstract: To improve the accuracy of estimating when a fracture occurred in the metal material. In the estimation apparatus, the fracture temperature estimation unit performs estimate calculation of the fracture temperature of a fractured metal material from the hydrogen embrittlement rate of the fractured metal material, the fracture occurrence time narrowing unit performs calculation by using the temperature information of the installation environment in which the fractured metal material is installed and narrow down the period during which the fracture temperature is obtained as the fracture occurrence period of the metal material, and the fracture time estimation unit performs estimate calculation of the timing of when stress was applied to the fractured metal material during the fracture occurrence period as the timing of when a fracture occurred in the metal material.

公开(公告)号：US20220134374A1

公开(公告)日：2022-05-05

申请号：US17431567

申请日：2020-02-06

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Ryuta Ishii ,  Shota Oki ,  Takuya Kamisho ,  Masayuki Tsuda

IPC: B05C3/02 ,  C04B14/48 ,  C04B41/45 ,  C04B41/65 ,  C04B41/00 ,  C09D5/08 ,  E04G23/02 ,  G01N17/00 ,  B05D1/18

Abstract: To repair reinforced concrete easily and at low cost. An anticorrosion method includes infiltrating an anticorrosion solution held inside concrete of reinforced concrete into a vicinity of a reinforcing bar through the concrete to passivate the reinforcing bar, detecting that the anticorrosion solution is infiltrated to a surface of the concrete, and discharging, after detecting the anticorrosion solution, the anticorrosion solution to outside of the concrete to form an anticorrosive coating on a surface of the reinforcing bar.

公开(公告)号：US20210348389A1

公开(公告)日：2021-11-11

申请号：US17274724

申请日：2019-09-12

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Takuya Kamisho ,  Masayuki Tsuda

IPC: E04C5/01 ,  E04G23/02

Abstract: Reinforced concrete is easily repaired at a low cost. An anti-corrosion method for preventing corrosion of a reinforcing bar inside reinforced concrete includes: an impregnation step of impregnating with water a cracked portion having occurred in the reinforced concrete, and a drying step of removing the water from the cracked portion and forming an anti-corrosive coating on the surface of the reinforcing bar. The anti-corrosive coating is formed by the neutralization of an alkali component by the drying step, the alkali component having been leached from concrete in the cracked portion by the impregnation step.

公开(公告)号：US20210239674A1

公开(公告)日：2021-08-05

申请号：US17053586

申请日：2019-04-24

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takuya Kamisho ,  Masamitsu Watanabe ,  Takashi Miwa ,  Yosuke Takeuchi

IPC: G01N33/2022

Abstract: To estimate penetration behavior of hydrogen up until hydrogen content reaches saturation even if load stress on steel is equal to or higher than threshold stress. A hydrogen penetration behavior estimation device includes a first measurement data input unit adapted to input first measurement data concerning variation of hydrogen content with time up until hydrogen content in steel-to-be-estimated reaches saturation when measurements are taken by applying such stress to the steel that no hydrogen embrittlement fracture occurs; a second measurement data input unit adapted to input second measurement data concerning variation of hydrogen content in the steel-to-be-estimated with time up until the steel fractures when measurements are taken by applying such stress to the steel that hydrogen embrittlement fracture occurs; a ratio calculation unit adapted to calculate increases in hydrogen contents in an initial stage of measurement and calculate a ratio of the second measurement data to the first measurement data in terms of increase in hydrogen content; and a saturated hydrogen content calculation unit adapted to multiply saturated hydrogen content based on the first measurement data by the ratio and designate the product as saturated hydrogen content of the steel-to-be-estimated, the saturated hydrogen content being reached upon application of such stress that hydrogen embrittlement fracture occurs.

公开(公告)号：US20210231596A1

公开(公告)日：2021-07-29

申请号：US15734654

申请日：2019-05-28

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yosuke Takeuchi ,  Takuya Kamisho ,  Masamitsu Watanabe

IPC: G01N27/20 ,  G01N3/08

Abstract: To easily detect a crack having occurred in a steel material. A current measurement device 10 measures a value of a current flowing through a target steel material 100 that is immersed in an electrolyte aqueous solution 30 and applied with tensile stress while subjected to hydrogen charging, and a device 20 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 100 when the amount of change in the current flowing through the target steel material 100, 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 20 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.

公开(公告)号：US12163946B2

公开(公告)日：2024-12-10

申请号：US17913150

申请日：2020-03-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hisatoshi Kasahara ,  Yosuke Takeuchi ,  Yosuke Okamura ,  Junichiro Tamamatsu

IPC: G01N33/38

Abstract: An assessment device (1) according to the present disclosure includes a determination unit (10) that determines a first period corresponding to a shortest period until deterioration of a concrete structure due to an aging-induced deterioration cause appears and a second period shorter than the first period and corresponding to a longest period until deterioration of the concrete structure due to a material-induced deterioration cause appears and an assessment unit (20) that assesses that a deterioration causing material is used in a concrete structure having, in a checking result indicating a period elapsed from construction of the concrete structure and the presence or absence of deterioration in the concrete structure, the deterioration and the period elapsed from the construction which is not shorter than the second period and is shorter than the first period.