CN111854666A - Method for scanning steel bars and detecting thickness of concrete protection layer - Google Patents
Method for scanning steel bars and detecting thickness of concrete protection layer Download PDFInfo
- Publication number
- CN111854666A CN111854666A CN202010657842.XA CN202010657842A CN111854666A CN 111854666 A CN111854666 A CN 111854666A CN 202010657842 A CN202010657842 A CN 202010657842A CN 111854666 A CN111854666 A CN 111854666A
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- steel bar
- protective layer
- building
- detection
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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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
- G01B7/02—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
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
Abstract
The invention relates to the technical field of concrete structure detection and identification, and discloses a method for scanning steel bars and detecting the thickness of a concrete protective layer, which comprises the following steps: s1: determining a detection area: acquiring the position of an area needing to be detected according to detection requirements, and cleaning the position of the area needing to be detected in advance; s2: building modeling: obtaining a building drawing, performing local three-dimensional modeling according to information in the building drawing, and manufacturing and displaying a building model of an area to be detected through three-dimensional software; s3: determining the position of the steel bar: preheating and zeroing the steel bar detector, and irregularly moving a probe of the steel bar detector on the surface of the building to be detected until the instrument displays a receiving signal. The method for scanning the steel bars and detecting the thickness of the concrete protective layer can solve the problem that the detection result has larger error when the diameter of the steel bars and the thickness of the protective layer are detected at present.
Description
Technical Field
The invention relates to the technical field of concrete structure detection and identification, in particular to a method for scanning a steel bar and detecting the thickness of a concrete protective layer.
Background
At present, the detection technology for concrete structures in constructional engineering comprises a traditional destructive detection method and a new nondestructive detection technology, the traditional detection method comprises a pull-out method, a core drilling method and the like, but the conventional methods have the defects of limited representativeness of detection results, easiness in leaking of bad sections, incapability of checking internal hidden dangers, destructiveness and the like. Therefore, the importance of nondestructive testing technology as an analysis means for quality control and post-disaster structural safety assessment in engineering construction is increasingly appearing. The common nondestructive detection technologies mainly include a rebound method, an ultrasonic rebound synthesis method, an infrared method, a ray detection method, an electromagnetic induction method, a ground penetrating radar method, an eddy current detection method and the like, wherein the electromagnetic induction detection method and the ground penetrating radar technology are the most important means in the quality detection of the building engineering due to the characteristics of low cost, high acquisition speed, high resolution and simple and understandable images.
In a reinforced concrete structure, the diameter of a steel bar and the thickness of a protective layer are main detection objects, but the detection time is long and the error is large when the diameter of the steel bar and the thickness of the protective layer are detected at present.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for scanning a steel bar and detecting the thickness of a concrete protective layer, which has the advantages of improving the detection efficiency and reducing the detection error result, and solves the problem of larger detection result error when the diameter of the steel bar and the thickness of the protective layer are detected at present.
(II) technical scheme
In order to realize the purposes of improving the detection efficiency and reducing the detection error result, the invention provides the following technical scheme: a steel bar scanning and concrete protective layer thickness detection method comprises the following steps:
s1: determining a detection area: acquiring the position of an area needing to be detected according to detection requirements, and cleaning the position of the area needing to be detected in advance;
s2: building modeling: obtaining a building drawing, performing local three-dimensional modeling according to information in the building drawing, and manufacturing and displaying a building model of an area to be detected through three-dimensional software;
s3: determining the position of the steel bar: preheating and zeroing a steel bar detector, performing irregular movement on a probe of the steel bar detector on the surface of a building to be detected until the instrument displays a received signal, performing circle-winding detection on the probe by taking a received signal point as a center, determining a strongest signal point, setting the strongest point as an original point, performing circle-winding detection by taking the original point as a starting point, determining a second strongest signal point again, connecting the original point and the second strongest signal point, repeating the movement to obtain the distribution condition of steel bars in building concrete, and referring to a three-dimensional building drawing to quickly obtain the positions of all the steel bars in a region to be detected;
S4: obtaining a protective layer thickness value: after the step of S3, setting the measuring range of the steel bar detector and the nominal diameter of the steel bar, avoiding steel bar connecting nodes, joints and binding wires, selecting positions with smaller influence on adjacent positions along the axis of the measured steel bar, testing twice at the same position of the steel bar, and obtaining the thickness value of the protective layer twice;
s5: determining a protective layer thickness value: and when the difference of the two protective layer thickness values read from the same position is larger than the error value, detecting again.
Preferably, in the step S5, when the thickness values of the protection layer read at the same position are still larger than the error value after the repeated measurement, the local notching method is used for verification.
Preferably, the partial grooving method verification specifically comprises: the part needing to be detected is grooved by using a tool, the reinforcing steel bar is exposed while the reinforcing steel bar is not damaged, and then the measurement is carried out by using a measuring tool.
Preferably, in the step S2, positions of the reinforcing steel bar connecting nodes and the joints are synchronously displayed in the building model according to display in the building drawing, so as to reduce an error in the detection process.
Preferably, in the step S5, the error value is 1 mm.
Preferably, in the step S1, the electromagnetic induction steel bar detector should be calibrated according to the concrete used for detecting the structural member before detection; during the detection process, the instrument should be checked frequently for deviation from the initial state and be zeroed in time.
Besides the operation method of learning the instrument, the tester should be familiar with appendix E in ' specification for acceptance of construction quality of concrete structure engineering ' GB50204 ' 2002 and the relevant regulations of ' technical specification for detecting reinforcing steel bars in concrete ' JGJ/T15272008, have basic knowledge of building structures, and be familiar with reinforcing bar arrangement modes of columns, beams and plates in the structures, and can understand the relevant drawings and have the capability of processing relevant problems on site.
(III) advantageous effects
Compared with the prior art, the invention provides a method for scanning steel bars and detecting the thickness of a concrete protective layer, which has the following beneficial effects:
according to the method for scanning the reinforcing steel bar and detecting the thickness of the concrete protective layer, a three-dimensional model is built through data support provided by a construction drawing, in the process of determining the position of the reinforcing steel bar, the distribution track of the reinforcing steel bar is obtained according to the strongest signal value before two points, the determination of the position of the reinforcing steel bar is rapidly completed by matching with the three-dimensional model, and the thickness value of the protective layer is accurately obtained through two times of measurement at the same position, so that the accuracy of a detection result is improved, and an error value is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A steel bar scanning and concrete protective layer thickness detection method comprises the following steps:
s1: determining a detection area: acquiring the position of an area needing to be detected according to detection requirements, and cleaning the position of the area needing to be detected in advance;
s2: building modeling: obtaining a building drawing, performing local three-dimensional modeling according to information in the building drawing, and manufacturing and displaying a building model of an area to be detected through three-dimensional software;
s3: determining the position of the steel bar: preheating and zeroing a steel bar detector, performing irregular movement on a probe of the steel bar detector on the surface of a building to be detected until the instrument displays a received signal, performing circle-winding detection on the probe by taking a received signal point as a center, determining a strongest signal point, setting the strongest point as an original point, performing circle-winding detection by taking the original point as a starting point, determining a second strongest signal point again, connecting the original point and the second strongest signal point, repeating the movement to obtain the distribution condition of steel bars in building concrete, and referring to a three-dimensional building drawing to quickly obtain the positions of all the steel bars in a region to be detected;
s4: obtaining a protective layer thickness value: after the step of S3, setting the measuring range of the steel bar detector and the nominal diameter of the steel bar, avoiding steel bar connecting nodes, joints and binding wires, selecting positions with smaller influence on adjacent positions along the axis of the measured steel bar, testing twice at the same position of the steel bar, and obtaining the thickness value of the protective layer twice;
S5: determining a protective layer thickness value: and when the difference of the two protective layer thickness values read from the same position is larger than the error value, detecting again.
The method has the advantages that the three-dimensional model is built through data support provided by the construction drawing, in the process of determining the position of the steel bar, the distribution track of the steel bar is obtained according to the strongest signal value before two points, the determination of the position of the steel bar is rapidly completed by matching with the three-dimensional model, and the thickness value of the protective layer is accurately obtained through two times of measurement at the same position, so that the accuracy of a detection result is improved, and the error value is reduced.
In step S5, when the thickness values of the protection layer read twice at the same position are still larger than the error value after repeated measurements, a local notching method is used for verification to ensure that the value of the detection result can be obtained.
The local slotting method is verified, and specifically comprises the following steps: the part needing to be detected is grooved by using the tool, the reinforcing steel bar is exposed while the reinforcing steel bar is not damaged, then the measurement is carried out by using the measuring tool, and the groove part is filled by using the same concrete material after the measurement is finished.
And in the step S2, according to the display in the construction drawing, the positions of the steel bar connecting nodes and the joints are synchronously displayed in the construction model, so that the error in the detection process is reduced, the detection at the positions of the steel bar connecting nodes and the joints is avoided when the detection is reduced, the unnecessary detection position is avoided, and the accuracy in the detection is improved.
In step S5, the error value is 1 mm.
S1, before detection, the steel bar detector by the electromagnetic induction method is calibrated according to the concrete adopted by the detection structural member; during the detection process, the instrument should be checked frequently for deviation from the initial state and be zeroed in time.
Besides the operation method of learning the instrument, the tester should be familiar with appendix E in ' specification for acceptance of construction quality of concrete structure engineering ' GB50204 ' 2002 and the relevant regulations of ' technical specification for detecting reinforcing steel bars in concrete ' JGJ/T15272008, have basic knowledge of building structures, and be familiar with reinforcing bar arrangement modes of columns, beams and plates in the structures, and can understand the relevant drawings and have the capability of processing relevant problems on site.
In conclusion, the method for scanning the reinforcing steel bars and detecting the thickness of the concrete protective layer supports the construction of a three-dimensional model through data provided by a construction drawing, obtains the distribution track of the reinforcing steel bars according to the strongest signal values before two points in the process of determining the positions of the reinforcing steel bars, rapidly determines the positions of the reinforcing steel bars by matching with the three-dimensional model, and accurately obtains the thickness value of the protective layer through two measurements at the same position, so that the accuracy of a detection result is improved, and an error value is reduced.
It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A steel bar scanning and concrete protective layer thickness detection method is characterized by comprising the following steps:
s1: determining a detection area: acquiring the position of an area needing to be detected according to detection requirements, and cleaning the position of the area needing to be detected in advance;
S2: building modeling: obtaining a building drawing, performing local three-dimensional modeling according to information in the building drawing, and manufacturing and displaying a building model of an area to be detected through three-dimensional software;
s3: determining the position of the steel bar: preheating and zeroing a steel bar detector, performing irregular movement on a probe of the steel bar detector on the surface of a building to be detected until the instrument displays a received signal, performing circle-winding detection on the probe by taking a received signal point as a center, determining a strongest signal point, setting the strongest point as an original point, performing circle-winding detection by taking the original point as a starting point, determining a second strongest signal point again, connecting the original point and the second strongest signal point, repeating the movement to obtain the distribution condition of steel bars in building concrete, and referring to a three-dimensional building drawing to quickly obtain the positions of all the steel bars in a region to be detected;
s4: obtaining a protective layer thickness value: after the step of S3, setting the measuring range of the steel bar detector and the nominal diameter of the steel bar, avoiding steel bar connecting nodes, joints and binding wires, selecting positions with smaller influence on adjacent positions along the axis of the measured steel bar, testing twice at the same position of the steel bar, and obtaining the thickness value of the protective layer twice;
S5: determining a protective layer thickness value: and when the difference of the two protective layer thickness values read from the same position is larger than the error value, detecting again.
2. The steel bar scanning and concrete protective layer thickness detection method according to claim 1, characterized in that: in the step S5, when the thickness values of the protection layer read at the same position twice are still larger than the error value after repeated measurement, the local notching method is adopted for verification.
3. The steel bar scanning and concrete protective layer thickness detection method according to claim 2, characterized in that: the local slotting method is verified, and specifically comprises the following steps: the part needing to be detected is grooved by using a tool, the reinforcing steel bar is exposed while the reinforcing steel bar is not damaged, and then the measurement is carried out by using a measuring tool.
4. The steel bar scanning and concrete protective layer thickness detection method according to claim 1, characterized in that: and in the step S2, synchronously displaying the positions of the steel bar connecting nodes and the joints in the building model according to the display in the building drawing, so that the error in the detection process is reduced.
5. The steel bar scanning and concrete protective layer thickness detection method according to claim 1, characterized in that: in the step S5, the error value is 1 mm.
6. The steel bar scanning and concrete protective layer thickness detection method according to claim 1, characterized in that: in the step S1, before detection, the electromagnetic induction steel bar detector should be calibrated according to the concrete used for detecting the structural member; during the detection process, the instrument should be checked frequently for deviation from the initial state and be zeroed in time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010657842.XA CN111854666A (en) | 2020-07-09 | 2020-07-09 | Method for scanning steel bars and detecting thickness of concrete protection layer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112598723A (en) * | 2020-12-17 | 2021-04-02 | 中南大学 | Method and device for identifying thickness of stainless steel coated steel bar and storage medium |
| CN112666545A (en) * | 2020-12-11 | 2021-04-16 | 南通勘察设计有限公司 | Concrete reinforcement protective layer thickness detection system and detection method thereof |
| CN112729198A (en) * | 2021-02-03 | 2021-04-30 | 乐清市建设监理有限公司 | Method for detecting thickness of concrete reinforcement protective layer |
| CN113566692A (en) * | 2021-07-23 | 2021-10-29 | 国网天津市电力公司电力科学研究院 | Nondestructive testing method for quality of cable cement protection cover plate |
| CN114111515A (en) * | 2022-01-26 | 2022-03-01 | 建研院检测中心有限公司 | Protective layer thickness measuring method and system adopting steel bar protective layer thickness structure standard sample |
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| CN108981557A (en) * | 2018-09-05 | 2018-12-11 | 广州大学 | Detection method that is a kind of while measuring reinforcement in concrete diameter and its protective layer thickness |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666545A (en) * | 2020-12-11 | 2021-04-16 | 南通勘察设计有限公司 | Concrete reinforcement protective layer thickness detection system and detection method thereof |
| CN112598723A (en) * | 2020-12-17 | 2021-04-02 | 中南大学 | Method and device for identifying thickness of stainless steel coated steel bar and storage medium |
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| CN112729198A (en) * | 2021-02-03 | 2021-04-30 | 乐清市建设监理有限公司 | Method for detecting thickness of concrete reinforcement protective layer |
| CN112729198B (en) * | 2021-02-03 | 2023-12-01 | 乐清市建设监理有限公司 | Method for detecting thickness of concrete reinforcement protection layer |
| CN113566692A (en) * | 2021-07-23 | 2021-10-29 | 国网天津市电力公司电力科学研究院 | Nondestructive testing method for quality of cable cement protection cover plate |
| CN113566692B (en) * | 2021-07-23 | 2023-12-08 | 国网天津市电力公司电力科学研究院 | Nondestructive testing method for quality of cable cement protection cover plate |
| CN114111515A (en) * | 2022-01-26 | 2022-03-01 | 建研院检测中心有限公司 | Protective layer thickness measuring method and system adopting steel bar protective layer thickness structure standard sample |
| CN114111515B (en) * | 2022-01-26 | 2022-05-20 | 建研院检测中心有限公司 | Protective layer thickness measuring method and system adopting steel bar protective layer thickness structure standard sample |
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