WO2021098197A1 - Appareil de test de barre d'armature dans du béton et procédé correspondant - Google Patents

Appareil de test de barre d'armature dans du béton et procédé correspondant Download PDF

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Publication number
WO2021098197A1
WO2021098197A1 PCT/CN2020/095587 CN2020095587W WO2021098197A1 WO 2021098197 A1 WO2021098197 A1 WO 2021098197A1 CN 2020095587 W CN2020095587 W CN 2020095587W WO 2021098197 A1 WO2021098197 A1 WO 2021098197A1
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WIPO (PCT)
Prior art keywords
concrete
capacitance value
steel bar
steel
capacitance
Prior art date
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PCT/CN2020/095587
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English (en)
Chinese (zh)
Inventor
王鹏刚
金祖权
赵铁军
侯东帅
田砾
范宏
牟犇
熊传胜
张小影
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青岛理工大学
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Publication of WO2021098197A1 publication Critical patent/WO2021098197A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/12—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation

Definitions

  • the invention relates to a device and a method for nondestructive detection of steel bars applied to concrete structures, and belongs to the field of building construction.
  • reinforced concrete structures are used in concrete construction.
  • the inspection items of steel bars in concrete structures include whether the position, size and other parameters are consistent with the design drawings, and whether the corrosion degree and state are within the standard value range.
  • the corrosion of steel bars usually occurs inside the concrete structure, and it is difficult to evaluate the service life and load-bearing capacity of the building.
  • the corrosion of steel bars will directly lead to the collapse of the building, which is extremely harmful.
  • the prior art mainly adopts technologies such as ultrasonic method, electromagnetic induction method, geological radar, and tomographic imaging for the detection of steel bars in concrete during the safety of infrastructure construction and the construction acceptance stage.
  • the electromagnetic induction method is a relatively common detection method, which can measure the position and depth of the steel bar relatively accurately.
  • the geological radar method is mainly used for the layered detection of concrete, and can also detect the position of the steel bars in the concrete, but the geological radar is relatively complicated to operate and the equipment is more expensive.
  • Tomography technology is also often used to evaluate concrete, but its application in practical engineering is limited due to expensive equipment, troublesome operation and data processing.
  • the device and method for detecting steel bars in concrete of the present invention solve the above-mentioned problems in the prior art and provide a low-cost, high-precision non-destructive detection device and method based on the principle of electrostatic field capacitance.
  • Targeted multiple inspections in order to obtain accurate and convenient inspection results including the position, size and corrosion amount of steel bars, so as to improve the work efficiency of construction project acceptance and inspection, reinforcement and appraisal of existing reinforced concrete structures.
  • the said device for detecting steel bars in concrete mainly includes an electrode plate, a DC power supply and a data acquisition and processing device. among them,
  • the electrode plate includes a copper electrode, polymethyl methacrylate and a moisture content test device, and the two copper electrodes are placed on the same level and on the same level;
  • the data acquisition and processing device includes a capacitance meter, the angular frequency of which is set to 10KHz; a display module to display the value obtained after detection by the capacitance sensor; an operation module to manually input specific project information to set parameters;
  • the processing module is used to perform data analysis and statistics on the measured values of the capacitance meter and other related values; the data connection line socket is used to connect the electrode plate.
  • this application also realizes a new detection method. That is, the state of the steel bar is determined according to the fluctuation of the capacitance value and the capacitance value data, and the calculation formula is as follows:
  • C is the capacitance between the two plates of the capacitive sensor, in farads (F) as the unit;
  • A is the (effective) area between the two plates, in square meters;
  • ⁇ r is the relative medium between the plates.
  • ⁇ is the absolute permittivity in vacuum (8.854 ⁇ 10 -12 Fm -1 );
  • d is the separation distance between the electrode plates, in meters; the change trend of the capacitance between the electrode plates indicates The difference in the location, size and amount of corrosion of the steel bars in the concrete.
  • the method for detecting steel bars in concrete includes the following implementation steps:
  • Calibration refers to the establishment of a characterization mapping with the state of the steel bar based on the capacitance value data.
  • the calibration process includes the calibration of the capacitance value and the diameter of the steel bar, the calibration of the capacitance value and the thickness of the protection layer of the steel bar, and the calibration of the capacitance value and the corrosion state of the steel bar;
  • the X axis is the scale of the moving direction of the electrode plate, and the Y axis is the capacitance value measured by the capacitance meter;
  • the calibration process includes the following steps:
  • the capacitance value obtained by using the data acquisition and processing device is brought into formula (2) to detect the thickness of the steel protection layer;
  • the detection and data correction are carried out by the capacitance sensor, the result is more accurate and convenient, and the capacitance sensor is not affected by the difference of materials, effectively avoiding errors.
  • FIG. 1 is a schematic diagram of the detection device described in this application.
  • Figure 2 is a schematic diagram of a data acquisition and processing device
  • Fig. 3 is a schematic side sectional view of the electrode plate
  • Fig. 4 is a schematic diagram of a front cross-section of the electrode plate
  • Figure 5 is an analysis diagram of detection data
  • Figure 6 is a schematic diagram of detecting the position of steel bars
  • Figure 7 is a schematic diagram of detecting the diameter of steel bars
  • Figure 8 shows the relationship between the amount of steel corrosion and the capacitance value.
  • 1-display module 2-pole plate connection line socket; 3-sliding trolley connection line; 4-operation module; 5-indicator light; 6-hook; 7-computer connection line socket; 8-power supply Charging line socket; 9-switch button; 10-steel bar; 11-electrode plate; 12-connection line between electrode plate and data acquisition and processing device; 13-data acquisition and processing device; 14-concrete; 15-copper electrode; 16-polya Methyl acrylate; 17-plastic shell; 18-plastic filler.
  • the said device for detecting steel bars in concrete mainly includes electrode plate 11, DC power supply, data acquisition and processing device 13, electrode plate and data acquisition and processing device ⁇ 12 ⁇ The connection line 12.
  • the electrode plate 11 includes a copper electrode 15, a polymethyl methacrylate 16 and a moisture content test device.
  • Copper electrodes 15 are used to generate excitation voltage and induced voltage.
  • the distance between the copper electrodes can be 0.5 cm.
  • Two copper electrodes 15 are placed at the same level and the same level.
  • the size of the electrode plate 11 It is 7.5cm ⁇ 4cm ⁇ 0.1mm.
  • the encapsulated copper electrode 15 can be polymethyl methacrylate 16 to ensure that the electrode plate 11 is in an insulated state.
  • the plastic casing 17 further encapsulates the encapsulated polymethyl methacrylate 16 so as to effectively protect the copper electrode 15.
  • the size of the polymethyl methacrylate 16 is 8.5 cm ⁇ 8.7 cm ⁇ 2 mm.
  • the plastic casing 17 has a cubic structure, and the copper electrode 15 is closely attached to the inner wall of one side of the casing 17 to facilitate detection.
  • the detection principle is to determine the state of the steel bars according to the fluctuation of the capacitance value and the size of the capacitance value.
  • the capacitance value of the parallel capacitance sensor can be calculated by the following formula:
  • C is the capacitance between the two plates of the capacitive sensor, in farads (F) as the unit;
  • A is the (effective) area between the two plates, in square meters
  • ⁇ r is the relative permittivity of the material between the plates
  • ⁇ is the absolute dielectric constant in vacuum (8.854 ⁇ 10 -12 Fm -1 );
  • d is the separation distance between the plates, in meters.
  • the detection substance between the copper electrodes 15 changes, that is, the dielectric constant ( ⁇ r ) between the copper plates 15 changes, causing the electrodes
  • the capacitance (C) between the plates changes.
  • the DC power supply supplies a stable 1.0V constant voltage to the electrode plate 11 so that the electrode plate 11 generates an excitation voltage.
  • the data acquisition and processing device 13 includes, as shown in Fig. 2:
  • Capacitance meter used to detect the capacitance value between the electrode plates 11, and its angular frequency is set to 10KHz;
  • the display module 1 is used for man-machine interactive operation after the completion.
  • the display module 1 is connected with the capacitance meter to display the value obtained after the capacitance sensor is detected.
  • the value can be displayed by digital display, curve display and bar display;
  • Operation module 4 used to manually input some specific engineering information, so as to be able to set parameters, switch the display mode and set the brightness, etc.;
  • Processing module used for data analysis and statistics of the measured value of the capacitance meter and other related values
  • the data connection line socket 2 is connected to the data acquisition and processing device 13 and the electrode plate 11;
  • Indicator light 5 always on means that the equipment is normal and ensure the equipment is working normally
  • the computer connection line jack 7 is used to connect with the computer to facilitate the import of the data into the computer for storage and further analysis and processing of the data;
  • the power charging line socket 10 is used for charging the data acquisition and processing device to ensure normal operation and provide voltage for the electrodes.
  • this application also implements the following method for detecting steel bars in concrete.
  • Calibration refers to the establishment of a characterization mapping with the state of the steel bar based on the capacitance value data.
  • Said calibration includes calibration of capacitance value and steel bar diameter, calibration of capacitance value and steel protection layer thickness, calibration of capacitance value and steel corrosion state, etc. specifically,
  • the indicator light in the data acquisition and processing device is always on, indicating that the equipment is normal;
  • the capacity of the room can be expressed as:
  • C is the capacitance between the electrode plates
  • a is the length of the electrode plates
  • b is the width of the electrode plates
  • d is the distance between the electrode plates
  • K 0 is the coefficient of different types of reinforced concrete
  • ⁇ x is The relative dielectric constant between the electrode plates; when other parameters are unchanged, the change of the relative dielectric constant between the electrode plates will directly affect the change of the capacitance.
  • the X axis is the scale of the moving direction of the electrode plate, and the Y axis is the capacitance value measured by the capacitance meter;
  • the position of the steel bar is detected, and the position of the steel bar in the concrete can be determined by the fluctuation of the capacitance value.
  • the data acquisition and processing device obtains the corrected capacitance value of each position through the relationship between the moisture content and the capacitance value. As shown in Fig. 6, it shows that the capacitance sensor can detect the positional relationship of the steel bars.
  • C is the corrected capacitance value
  • B is the diameter of the steel bar
  • D is the thickness of the protective layer of the steel bar
  • a, b, c, e, f, and g are the values obtained after fitting
  • C is the corrected capacitance value
  • K 0 is the coefficient under different reinforced concrete states
  • ⁇ M is the corrosion amount of the steel bars in the reinforced concrete to be tested.

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Remote Sensing (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

L'invention concerne un appareil de test d'une barre d'armature dans du béton, ainsi qu'un procédé correspondant. L'appareil de test comprend une plaque d'électrode (11), une source d'alimentation en courant continu et un appareil de traitement d'acquisition de données (13), l'appareil de traitement d'acquisition de données (13) comprenant : un compteur de capacité, une fréquence angulaire de ce dernier étant réglée à 10 KHz ; un module d'affichage (1) permettant d'afficher une valeur numérique obtenue après le test par un capteur de capacité ; un module de fonctionnement (4) permettant d'effectuer une opération réelle manuelle et d'entrer des informations d'ingénierie spéciales afin de régler un paramètre ; un module de traitement permettant de compiler des statistiques d'analyse de données sur la valeur numérique mesurée par le compteur de capacité et d'autres valeurs numériques pertinentes ; et une prise de ligne de connexion de données (2) permettant la connexion à la plaque d'électrode (11). L'invention concerne un appareil et un procédé de test sans perte et à faible coût et haute précision fondés sur le principe de la capacité de champ électrostatique. Divers types de test ciblé sont mis en œuvre sur une barre d'armature dans du béton, de manière à acquérir un résultat de test précis et pratique comprenant la position, la taille et la quantité de corrosion de barre d'armature, et l'efficacité de travail d'acceptation de génie civil, et le test, le renforcement et l'identification d'une structure en béton armé existante sont améliorés.
PCT/CN2020/095587 2019-11-22 2020-06-11 Appareil de test de barre d'armature dans du béton et procédé correspondant WO2021098197A1 (fr)

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CN201911157575.3A CN110836631B (zh) 2019-11-22 2019-11-22 混凝土中钢筋检测装置及其方法
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Cited By (2)

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CN113702490A (zh) * 2021-08-27 2021-11-26 重庆邮电大学 一种基于涡流热传导的混凝土内部钢筋锈蚀量估计方法
US11919193B2 (en) 2022-07-26 2024-03-05 Ge Infrastructure Technology Llc System and method for tracking reinforcement member placement in an additively manufactured structure

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CN110836631B (zh) * 2019-11-22 2023-06-13 青岛理工大学 混凝土中钢筋检测装置及其方法
CN111398688B (zh) * 2020-04-03 2022-05-27 湖南中科特种陶瓷技术开发有限公司 一种陶瓷高介电常数(εr)和低介质损耗(QxF值)的检测方法
CN112630270A (zh) * 2020-12-28 2021-04-09 青岛理工大学 一种混凝土结构中钢筋状态检测方法
CN113218838B (zh) * 2021-04-23 2023-05-05 江西理工大学 一种煤岩芯渗透率测定仪及测定方法

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CN102636104A (zh) * 2012-05-15 2012-08-15 安徽工业大学 一种电容式螺纹钢线径在线测量系统及其检测方法
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Publication number Priority date Publication date Assignee Title
CN113702490A (zh) * 2021-08-27 2021-11-26 重庆邮电大学 一种基于涡流热传导的混凝土内部钢筋锈蚀量估计方法
CN113702490B (zh) * 2021-08-27 2024-04-30 重庆邮电大学 一种基于涡流热传导的混凝土内部钢筋锈蚀量估计方法
US11919193B2 (en) 2022-07-26 2024-03-05 Ge Infrastructure Technology Llc System and method for tracking reinforcement member placement in an additively manufactured structure

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