CN113186995A - Reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficient - Google Patents
Reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficient Download PDFInfo
- Publication number
- CN113186995A CN113186995A CN202110482762.XA CN202110482762A CN113186995A CN 113186995 A CN113186995 A CN 113186995A CN 202110482762 A CN202110482762 A CN 202110482762A CN 113186995 A CN113186995 A CN 113186995A
- Authority
- CN
- China
- Prior art keywords
- reflection coefficient
- reinforced concrete
- concrete foundation
- scanning
- reference value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 88
- 230000007797 corrosion Effects 0.000 title claims abstract description 76
- 238000005260 corrosion Methods 0.000 title claims abstract description 75
- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 239000004567 concrete Substances 0.000 description 12
- 230000008859 change Effects 0.000 description 8
- 239000007822 coupling agent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000003910 Baronia <angiosperm> Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/02—Investigating the presence of flaws
Abstract
The invention provides a reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficients. The method specifically comprises the steps of firstly transmitting a microwave signal to a reinforced concrete foundation, determining a scanning frequency f, and acquiring a reflection coefficient reference value gamma corresponding to the scanning frequency f0Then, the rectangular waveguide is used for scanning the power transmission and transformation reinforced concrete foundation with the scanning frequency f to obtain the reflection coefficient gamma1Finally, the gamma is compared0And Γ1，Γ0Is greater than Γ1When the value (1) is less than the predetermined value, the steel bar is corroded; gamma-shaped0Is equal to Γ1At the value of (1), the steel bar is not corroded. The system and the method provided by the invention can realize non-contact detection of the corrosion state of the reinforced concrete foundationAnd the method is suitable for most complex environments, and the detection precision is ensured while the operation is simple.
Description
Technical Field
The invention relates to the technical field of reinforced concrete corrosion detection, in particular to a reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficients.
Background
With the continuous expansion of the scale of the power grid in China, the construction of power transmission and transformation projects needs to be carried out in areas with strong corrosive soil. The construction of the power transmission and transformation project needs to use a large number of power transmission and transformation reinforced concrete structures, for example, a transformer substation foundation, a grounding grid, a tower foundation and the like can all use the power transmission and transformation reinforced concrete structures, however, under the environment of strong corrosive soil, the reinforced concrete structures are often easily corroded. Some concrete structures with serious corrosion conditions face very high collapse risks, and the safe and stable operation of a power system is greatly influenced.
The existing steel bar corrosion detection method mainly comprises an ultrasonic nondestructive detection method and a half-cell potential method. The ultrasonic nondestructive testing method mainly reflects the corrosion condition of the reinforced concrete structure according to the change condition of ultrasonic waves when the ultrasonic waves are transmitted in the reinforced concrete structure. However, when corrosion detection is performed by using an ultrasonic nondestructive detection method, a couplant needs to be coated on an ultrasonic probe, but the environment is greatly polluted by using the couplant, and when ultrasonic waves propagate from one medium to an interface of another medium, reflection, transmission and refraction occur, along with energy conversion, a part of energy of the ultrasonic waves is reflected at the interface, and a part of energy is directly transmitted into the medium through the interface, so that the energy loss condition of the ultrasonic waves is increased by the couplant on the probe, and the accuracy of corrosion detection of the steel bars is affected. The half-cell potential rule judges the corrosion degree of the steel bar by detecting and comparing the potential difference between the steel bar and a reference electrode, the reference electrode needs to be placed in concrete during detection, the original reinforced concrete structure can be damaged, the result is influenced by the relative humidity, the cement type, the water-cement ratio and the like of the environment, and the detection accuracy of the corrosion degree of the steel bar is not high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficients.
The purpose of the invention is realized by the following technical scheme:
a reinforced concrete foundation corrosion detection method based on microwave reflection coefficients comprises the following steps:
the method comprises the steps of firstly, transmitting microwave signals by using a vector network analyzer and a rectangular wave guide reinforced concrete foundation, determining the scanning frequency f of the vector network analyzer and the rectangular wave guide, and acquiring a reflection coefficient reference value gamma of the reinforced concrete foundation corresponding to the scanning frequency f0；
Secondly, scanning the power transmission and transformation reinforced concrete foundation by using the rectangular waveguide at a scanning frequency f to obtain a reflection coefficient gamma1；
Step three, comparing gamma0And Γ1A value of (f)0Is greater than Γ1If so, the steel bar is corroded; if gamma is0Is equal to Γ1If the value is less than the predetermined value, the steel bar is not corroded, and the step II is returned to, the reflection coefficient gamma is updated1The value of (c).
The corrosion detection is carried out by transmitting microwave signals through the vector network analyzer and the rectangular waveguide, the corrosion condition of the steel bar is detected through the microwave signals, the penetration capability of the microwave signals on materials with poor conductivity, such as concrete, is strong, and the corrosion degree of the steel bar can be effectively detected through the microwave detection method even in a complex environment. And the vector network analyzer and the rectangular waveguide are detected in a non-contact mode, and the influence of air on detection signals is reduced without using a coupling agent in the using process, so that the damage to the environment caused by using the coupling agent is avoided, the reinforced concrete structure is not required to be modified, and the working performance of reinforced concrete is prevented from being influenced. Whether the steel bar is corroded is determined by comparing the change of the reflection coefficient.
Further, the concrete process for acquiring the reference value of the basic reflection coefficient of the reinforced concrete comprises the following steps: scanning a plurality of positions of the non-corroded power transmission and transformation reinforced concrete foundation by using the rectangular waveguide at a fixed scanning frequency to obtain a reflection coefficient of the scanning frequency, taking the obtained reflection coefficient as a reflection coefficient reference value corresponding to the scanning frequency, scanning by using the rectangular waveguide at a plurality of scanning frequencies to obtain a reflection coefficient reference value corresponding to each scanning frequency, recording each scanning frequency and the reflection coefficient reference value corresponding to each scanning frequency, and constructing a reflection coefficient reference value data unit.
Scanning the different positions of reinforced concrete foundation, acquire whole reinforced concrete's reflectance and carry out the record, because the structure in the reinforced concrete foundation is not completely unanimous, so the reflectance who obtains can change along with the change of position, and reinforcing bar in the reinforced concrete foundation is when receiving the corruption, also can cause the influence to other parts that are close with the reinforcing bar in the reinforced concrete foundation, so not only detect the position that has the reinforcing bar, also scan different positions, when the change of whole reflectance around the contrast corruption, can audio-visual demonstration the condition of corruption and the degree of corruption. And the reflection coefficient of the non-corroded power transmission and transformation reinforced concrete foundation is used as a reflection coefficient reference value, and the corrosion condition can be judged by comparing the reflection coefficient reference value with the reflection coefficient reference value. Because the reflection coefficient reference values obtained by different scanning frequencies are different, the scanning frequencies need to be adjusted to obtain the most accurate reflection coefficient in different detection environments, so that the scanning frequencies used in each detection are possibly different, the reflection coefficient reference values are also different, and the non-corroded reinforced concrete foundation needs to be scanned at different scanning frequencies to obtain the reflection coefficient reference values corresponding to all the possible scanning frequencies. And constructing a reflection coefficient reference value data unit according to all the obtained reflection coefficient reference values, and matching the scanning frequency in the reflection coefficient reference value data unit to obtain the required reflection coefficient reference value when the reflection coefficient reference value is required to be compared in the follow-up process.
Further, the scanning frequency f is matched with the scanning frequency in the reflection coefficient reference value data unit, so that the reflection coefficient reference value gamma of the reinforced concrete foundation corresponding to the scanning frequency f is obtained0。
The reflection coefficient reference value is adjusted according to the scanning frequency f, the subsequent calculation precision of delta gamma is effectively improved, and the corrosion degree of the steel bar can be reflected more accurately.
Further, F in step three0Is greater than Γ1When the value of (a) is greater than the value of (b), t is also calculated0And a difference value delta gamma of gamma 1, and judging the corrosion degree of the steel bar according to the delta gamma, wherein the larger the delta gamma is, the more serious the corrosion is.
Not only detect whether the reinforcing bar corrodes, still calculate the degree of corrosion of reinforcing bar, come the rational arrangement maintenance scheme through the degree of corrosion of reinforcing bar, under the prerequisite of guaranteeing safe in utilization, improve maintenance efficiency.
Further, when it is determined in the third step that the steel bar is corroded, the specific position of the corrosion is determined by adjusting the scanning direction of the rectangular waveguide, and the determination process of the corrosion position specifically comprises the following steps: the method comprises the steps that a rectangular waveguide scans a reinforced concrete foundation which judges that steel bars are corroded in a plurality of scanning directions with the same scanning frequency, the reflection coefficient obtained in each scanning direction is compared with a reflection coefficient reference value, the scanning direction with the reflection coefficient smaller than or equal to the reflection coefficient reference value is screened out, the reflection coefficient corresponding to the screened scanning direction is compared for the second time, the scanning direction corresponding to the minimum reflection coefficient amplitude is obtained, the specific position with the minimum reflection coefficient amplitude is obtained according to the scanning range of the rectangular waveguide in the scanning direction, and the position with the minimum reflection coefficient amplitude is the position where the steel bars are corroded.
Further, a reflection coefficient reference value Γ is obtained0And a reflection coefficient Γ1After the value of (c), the reflectance value Γ is also measured1And a reflection coefficient reference value gamma0And displaying the scanning direction and the scanning range of the rectangular waveguide on the image.
The change of the reflection coefficient is displayed in an image mode, and the position of the steel bar corrosion layer can be determined according to the scanning direction and the scanning range of the image curve matched with the rectangular waveguide when the steel bar corrosion area is judged. Although the position of the steel bar corrosion layer can be simply determined through the image, the steel bar corrosion may be corrosion in a small area, the steel bar is not completely wrapped by the corrosion layer, so the reinforced concrete foundation is scanned in different scanning directions, scanning results are screened and compared, the scanning direction with the reflection coefficient smaller than or equal to the reference value of the reflection coefficient is firstly obtained, and the corrosion in the direction is proved. Because corrosion often exists in the corrosion center, the corrosion center is often the most severe place of corrosion, namely the place with the smallest reflection coefficient amplitude, the scanning direction with the smallest reflection coefficient amplitude is obtained by comparing the reflection coefficients of the scanning directions with corrosion, and the specific position of the corrosion center is obtained according to the scanning range.
Further, the gamma is compared in the third step0And Γ1Also obtained by scanning the rectangular waveguide (12) and a reflection coefficient value Γ1And a reflection coefficient reference value gamma0The value of (f) is used for judging the bending condition of the steel bar (6), and if the reflection coefficient reference value gamma is0Less than the reflection coefficient Γ1The value of (2) indicates that the reinforcing steel bar (6) is bent.
Since the steel bar also affects the safety and reliability of the power system when bent, the value of reflectance r at the time of bending depends on the value of1And a reflection coefficient reference value gamma0The bending information is obtained through comparison, and a basis is provided for subsequent maintenance scheme formulation.
The utility model provides a reinforced concrete foundation corrodes detecting system based on microwave reflection coefficient, includes signal output module, data processing module and signal receiving module, signal output module and signal receiving module all are connected with data processing module, signal output module is used for producing and sends fixed frequency's microwave signal, signal receiving module is used for accepting the reflection signal that reinforced concrete foundation reflected back, data processing module is used for obtaining the reflection coefficient according to the reflection signal that reinforced concrete foundation reflected back, data processing module still is used for judging the corruption condition of reinforcing bar according to the reflection coefficient.
The signal output module, the data processing module and the signal receiving module are all arranged on the periphery of the reinforced concrete foundation, the structure of the reinforced concrete foundation is not damaged, and the corrosion condition of the steel bar can be obtained through scanning. And the signal output module can provide a microwave signal with a fixed frequency for scanning.
The scanning device further comprises a reflection coefficient reference value data unit, wherein the reflection coefficient reference value data unit is connected with the data processing module and is used for storing reflection coefficient reference values corresponding to all scanning frequencies.
Furthermore, the signal output module comprises a vector network analyzer and a rectangular waveguide, the vector network analyzer is used for generating microwave signals with fixed frequency, the rectangular waveguide is connected with the vector network analyzer, and the rectangular waveguide is used for transmitting microwave incident signals to the reinforced concrete foundation.
The invention has the beneficial effects that:
the method is suitable for most complicated environments, is simple to operate, can obtain the corrosion condition of the steel bar from an image of a reflection coefficient only by simply setting scanning frequency, solves the problem of complicated operation compared with the traditional ultrasonic detection, does not need to use a coupling agent to eliminate the interference of air when in use due to the fact that the microwave signal is used for scanning and detecting, and reduces the pollution of the coupling agent to the environment and improves the detection accuracy. The reinforced concrete foundation corrosion detection system adopts whole-course non-contact detection, so that the reinforced concrete structure does not need to be reformed, the detection result cannot be influenced by the change of the reinforced concrete and the environment, and the detection precision is ensured on the premise of not damaging the reinforced concrete structure.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
FIG. 3 is a front view of an un-corroded power transmission and transformation reinforced concrete foundation model according to an embodiment of the invention;
FIG. 4 is a front view of a post-corrosion reinforced concrete foundation model of an embodiment of the present invention;
FIG. 5 is a schematic illustration of a scanning process for an un-corroded power transmission and transformation reinforced concrete foundation model according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a scanning process for a post-corrosion reinforced concrete base model of power transmission and transformation according to an embodiment of the present invention;
FIG. 7 is a graph comparing the results of the reflectivity before and after corrosion of steel in accordance with one embodiment of the present invention;
wherein: 1. the device comprises a signal output module 2, a data processing module 3, a signal receiving module 4, a reflection coefficient reference value data unit 11, a vector network analyzer 12, a rectangular waveguide 5, a concrete foundation 6, a steel bar 61 and a steel bar corrosion layer.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example (b):
a method for detecting the corrosion of a reinforced concrete foundation based on a microwave reflection coefficient is shown in figure 1 and comprises the following steps:
the method comprises the steps of firstly, transmitting microwave signals to the reinforced concrete foundation by using a vector network analyzer 11 and a rectangular waveguide 12, determining the scanning frequency f of the vector network analyzer 11 and the rectangular waveguide 12, and acquiring a reflection coefficient reference value gamma of the reinforced concrete foundation corresponding to the scanning frequency f0；
Secondly, scanning the power transmission and transformation reinforced concrete foundation by using the rectangular waveguide 12 at a scanning frequency f to obtain a reflection coefficient gamma1；
Step three, comparing gamma0And Γ1A value of (f)0Is greater than Γ1If so, the steel bar is corroded; if gamma is0Is equal to Γ1If the value is less than the predetermined value, the steel bar is not corroded, and the step II is returned to, the reflection coefficient gamma is updated1The value of (c).
The concrete obtaining process of the reflection coefficient reference value of the reinforced concrete foundation comprises the following steps: scanning a plurality of positions of the non-corroded power transmission and transformation reinforced concrete foundation by using the rectangular waveguide 12 at a fixed scanning frequency to obtain the reflection coefficient of the scanning frequency, taking the obtained reflection coefficient as the reflection coefficient reference value corresponding to the scanning frequency, then scanning by using the rectangular waveguide 12 at a plurality of scanning frequencies to obtain the reflection coefficient reference value corresponding to each scanning frequency, recording each scanning frequency and the reflection coefficient reference value corresponding to each scanning frequency, and constructing the reflection coefficient reference value data unit 4.
The scanning frequency f is matched with the scanning frequency in the reflection coefficient reference value data unit 4 to obtain the reflection coefficient reference value gamma of the reinforced concrete foundation corresponding to the scanning frequency f0。
Rhus hederacea L.in step III0Is greater than Γ1When the value of (a) is greater than the value of (b), t is also calculated0And a difference value delta gamma of gamma 1, and judging the corrosion degree of the steel bar according to the delta gamma, wherein the larger the delta gamma is, the more serious the corrosion is.
When the steel bar is judged to be corroded in the third step, the specific position of the corrosion is judged by adjusting the scanning direction of the rectangular waveguide 12, and the judgment process of the corrosion position specifically comprises the following steps: the rectangular waveguide 12 scans the reinforced concrete foundation which judges that the steel bar is corroded in a plurality of scanning directions with the same scanning frequency, the reflection coefficient obtained in each scanning direction is compared with a reflection coefficient reference value, the scanning direction with the reflection coefficient smaller than or equal to the reflection coefficient reference value is screened out, the reflection coefficient corresponding to the screened scanning direction is compared for the second time, the scanning direction corresponding to the minimum reflection coefficient amplitude is obtained, the specific position with the minimum reflection coefficient amplitude is obtained according to the scanning range of the rectangular waveguide 12 in the scanning direction, and the position with the minimum reflection coefficient amplitude is the position of the steel bar corrosion.
Obtaining a reflection coefficient reference value gamma0And a reflection coefficient Γ1After the value of (c), the reflectance value Γ is also measured1And a reflection coefficient reference value gamma0The display is made by an image, and the scanning direction and the scanning range of the rectangular waveguide 12 are displayed on the image.
Comparison of gamma in step three0And Γ1Also obtained by scanning the rectangular waveguide 12, the value of reflectance Γ1And a reflection coefficient reference value gamma0Judging the bending condition of the steel bar 6 by the value of (A), and if the reflection coefficient reference value gamma is larger than the reference value gamma0Less than the reflection coefficient Γ1The value of (2) indicates that the reinforcing bar 6 is bent.
The utility model provides a reinforced concrete foundation corrosion detection system based on microwave reflection coefficient, as shown in figure 2, including signal output module 1, data processing module 2, signal reception module 3 and reflection coefficient reference value data unit 4, signal output module 1 and signal reception module 3 all are connected with data processing module 2, signal output module 1 is used for producing and sending fixed frequency's microwave signal, signal reception module 3 is used for accepting the reflection signal that reinforced concrete foundation reflects back, data processing module 2 is used for obtaining reflection coefficient according to the reflection signal that reinforced concrete foundation reflects back, data processing module 2 still is used for judging the corrosion condition of reinforcing bar according to reflection coefficient. The reflection coefficient reference value data unit 4 is connected with the data processing module 2, and the reflection coefficient reference value data unit 4 is used for storing reflection coefficient reference values corresponding to each scanning frequency.
The signal output module 1 comprises a vector network analyzer 11 and a rectangular waveguide 12, wherein the vector network analyzer 11 is used for generating a microwave signal with fixed frequency, the rectangular waveguide 12 is connected with the vector network analyzer 11, and the rectangular waveguide 12 is used for transmitting a microwave incident signal to the reinforced concrete foundation.
Analysis is carried out by taking the non-corroded and corroded models of the base shrinkage ratio of the power transmission and transformation reinforced concrete as examples. Firstly, establishing a power transmission and transformation reinforced concrete foundation scaling model through CST software, wherein the length of a concrete foundation 5 is set to be 400mm, the width is set to be 110mm, and the height is set to be 400 mm; the diameter of the steel bar 6 in the concrete foundation 5 is set to be 20mm, and the length of the steel bar 6 is set to be 402 mm; while the rectangular waveguide 12 employs WR-90, the specific parameters of which are shown in table 1:
TABLE 1
After the foundation sizes of the concrete foundation 5, the steel bars 6 and the rectangular waveguide 12 are set, two sets of simulation models are established according to the structure and material properties of the concrete foundation 5, the steel bars 6 and the rectangular waveguide 12, wherein one set is an un-corroded power transmission and transformation reinforced concrete model, the front view of which is shown in fig. 3, and the un-corroded steel bars 6 are positioned in the middle of a concrete block. One group is a corroded power transmission and transformation reinforced concrete model, the front view of which is shown in fig. 4, a reinforced steel bar 6 comprises a reinforced steel bar corrosion layer 61, the reinforced steel bar 6 is still positioned in the middle of the concrete block, and the initial placement positions of the two groups of rectangular waveguides 12 are consistent. Because the steel bar 6 has the characteristics of reduced conductivity, increased roughness of the surface of the steel bar 6, reduced overall density and the like after corrosion, the corresponding setting of parameters such as the conductivity of the steel bar corrosion layer 61 material, the surface roughness of the steel bar 6 material, the density value and the like needs to be carried out on the corroded power transmission and transformation reinforced concrete model. When the two sets of models are scanned through the rectangular waveguide 12, the scanning directions and the scanning ranges of the two sets are kept consistent.
Firstly, a microwave signal is generated through a vector network analyzer 11, and then the surface of the reinforced concrete is scanned by using a rectangular waveguide 12, wherein the scanning step length is 2mm, namely, the surface is scanned once every 2 mm. Specifically, as shown in fig. 5 and 6, the rectangular waveguide 12 starts to scan from bottom to top at a position 100mm below the steel bar 6, the scanning range is 200mm, and the rectangular waveguide 12 keeps a distance of 2mm from the surface of the model.
The reflection coefficients of the non-corroded power transmission and transformation reinforced concrete models and the reflection coefficients of the corroded power transmission and transformation reinforced concrete models are collected, the reflection coefficients of the two models are compared, a comparison result graph is shown in figure 7, wherein the solid line is the reflection coefficient before etching, the dotted line is the reflection coefficient after etching, the two curves are similar in shape to a certain extent, and the reflection coefficient curve after corrosion is wholly moved downwards than the reflection coefficient curve without corrosion, the reflection coefficient of the position of the steel bar 6 without corrosion is about 0.36, the amplitude is highest, the reflection coefficient of the corroded steel bar 6 is only about 0.3, so that the reflection coefficient of the reinforced concrete obtained by taking the microwave signal as the detection signal can be changed along with the corrosion condition, and the corrosion degree can be judged by calculating the change amplitude of the reflection coefficient, and the corrosion degree is intuitively reflected from the image.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (10)
1. A reinforced concrete foundation corrosion detection method based on microwave reflection coefficients is characterized by comprising the following steps:
the method comprises the steps of firstly, transmitting microwave signals to the reinforced concrete foundation by using a vector network analyzer (11) and a rectangular waveguide (12), determining the scanning frequency f of the vector network analyzer (11) and the rectangular waveguide (12), and acquiring a reflection coefficient reference value gamma of the reinforced concrete foundation corresponding to the scanning frequency f0(ii) a Secondly, scanning the power transmission and transformation reinforced concrete foundation by using the rectangular waveguide (12) at a scanning frequency f to obtain a reflection coefficient gamma1(ii) a Step three, comparing gamma0And Γ1A value of (f)0Is greater than Γ1If so, the steel bar (6) is corroded; if gamma is0Is equal to Γ1If the value is less than the predetermined value, the steel bar (6) is not corroded, and the step two is returned to, the reflection coefficient gamma is updated1The value of (c).
2. The method for detecting the corrosion of the reinforced concrete foundation based on the microwave reflection coefficient as claimed in claim 1, wherein the specific acquisition process of the reflection coefficient reference value of the reinforced concrete foundation is as follows: scanning a plurality of positions of a non-corroded power transmission and transformation reinforced concrete foundation by using a rectangular waveguide (12) at a fixed scanning frequency to obtain a reflection coefficient of the scanning frequency, taking the obtained reflection coefficient as a reflection coefficient reference value corresponding to the scanning frequency, then scanning by using the rectangular waveguide (12) at a plurality of scanning frequencies to obtain a reflection coefficient reference value corresponding to each scanning frequency, recording each scanning frequency and the reflection coefficient reference value corresponding to each scanning frequency, and constructing a reflection coefficient reference value data unit (4).
3. A reinforced concrete foundation corrosion detection method based on microwave reflection coefficient according to claim 2, characterized in that the scanning frequency f is matched with the scanning frequency in the reflection coefficient reference value data unit (4) to obtain the reflection coefficient reference value Γ of the reinforced concrete foundation corresponding to the scanning frequency f0。
4. Steel based on microwave reflection coefficient according to claim 1The corrosion detection method for the reinforced concrete foundation is characterized in that F & ltR & gt in the step three0Is greater than Γ1When the value of (a) is greater than the value of (b), t is also calculated0And Γ1And judging the corrosion degree of the steel bar (6) according to the delta gamma, wherein the larger the delta gamma is, the more serious the corrosion is.
5. The reinforced concrete foundation corrosion detection method based on the microwave reflection coefficient according to claim 1, wherein when the steel bar (6) is judged to be corroded in the third step, the specific position of corrosion occurrence is judged by adjusting the scanning direction of the rectangular waveguide (12), and the judgment process of the corrosion position is specifically as follows: the method comprises the steps that a rectangular waveguide (12) scans a reinforced concrete foundation which judges that a steel bar (6) is corroded in a plurality of scanning directions at the same scanning frequency, the reflection coefficient obtained in each scanning direction is compared with a reflection coefficient reference value, the scanning direction with the reflection coefficient smaller than or equal to the reflection coefficient reference value is screened out, the reflection coefficient corresponding to the screened scanning direction is compared for the second time, the scanning direction with the minimum reflection coefficient amplitude is obtained, the specific position with the minimum reflection coefficient amplitude is obtained according to the scanning range of the rectangular waveguide (12) in the scanning direction, and the position with the minimum reflection coefficient amplitude is the corrosion position of the steel bar (6).
6. The method for detecting the corrosion of the reinforced concrete foundation based on the microwave reflection coefficient as claimed in claim 1, wherein a reflection coefficient reference value Γ is obtained0And a reflection coefficient Γ1After the value of (c), the reflectance value Γ is also measured1And a reflection coefficient reference value gamma0The image is displayed, and the scanning direction and the scanning range of the rectangular waveguide (12) are displayed on the image.
7. The reinforced concrete foundation corrosion detection method based on the microwave reflection coefficient of claim 1, wherein the gamma is compared in the third step0And Γ1Also obtained by scanning the rectangular waveguide (12) and a reflection coefficient value Γ1And vice versaGamma ray coefficient reference value gamma0The value of (f) is used for judging the bending condition of the steel bar (6), and if the reflection coefficient reference value gamma is0Less than the reflection coefficient Γ1The value of (2) indicates that the reinforcing steel bar (6) is bent.
8. The utility model provides a reinforced concrete foundation corrosion detection system based on microwave reflection coefficient, characterized in that, includes signal output module (1), data processing module (2) and signal receiving module (3), signal output module (1) and signal receiving module (3) all are connected with data processing module (2), signal output module (1) is used for producing and sends the microwave signal of fixed frequency, signal receiving module (3) are used for accepting the reflection signal that reinforced concrete foundation reflects back, data processing module (2) are used for obtaining the reflection coefficient according to the reflection signal that reinforced concrete foundation reflects back, data processing module (2) still are used for judging the corruption condition of reinforcing bar (6) according to the reflection coefficient.
9. A microwave reflection coefficient-based reinforced concrete foundation corrosion detection system according to claim 8, further comprising a reflection coefficient reference value data unit (4), wherein the reflection coefficient reference value data unit (4) is connected with the data processing module (2), and the reflection coefficient reference value data unit (4) is used for storing reflection coefficient reference values corresponding to each scanning frequency.
10. A reinforced concrete foundation corrosion detection system based on microwave reflection coefficient according to claim 8, characterized in that the signal output module (1) comprises a vector network analyzer (11) and a rectangular waveguide (12), the vector network analyzer (11) is used for generating microwave signals with fixed frequency, the rectangular waveguide (12) is connected with the vector network analyzer (11), and the rectangular waveguide (12) is used for transmitting microwave incident signals to the reinforced concrete foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110482762.XA CN113186995A (en) | 2021-04-30 | 2021-04-30 | Reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110482762.XA CN113186995A (en) | 2021-04-30 | 2021-04-30 | Reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113186995A true CN113186995A (en) | 2021-07-30 |
Family
ID=76983509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110482762.XA Pending CN113186995A (en) | 2021-04-30 | 2021-04-30 | Reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficient |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113186995A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018953A (en) * | 2021-10-18 | 2022-02-08 | 浙江武义电气安装工程有限公司 | Reinforced concrete foundation corrosion detection method and system based on microwave transmission method |
| CN116930215A (en) * | 2023-09-18 | 2023-10-24 | 山东创瑞激光科技有限公司 | SLM powder layer defect recognition system and method based on microwave detection |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070220946A1 (en) * | 2006-03-03 | 2007-09-27 | Joseph Pecina | Processes to create discrete corrosion defects on substrates and establish corrosion NDI test standards |
| CN102706901A (en) * | 2012-06-01 | 2012-10-03 | 刘马宝 | Microwave non-destructive testing device and method for metal structure corrosion under protection layer |
| CN104964990A (en) * | 2015-06-03 | 2015-10-07 | 北京理工大学 | Via-hole split ring resonator (VSRR) loaded waveguide probe used for detection of defect on metal surface |
| CN107703159A (en) * | 2017-09-27 | 2018-02-16 | 山东省科学院激光研究所 | Inner-walls of duct detecting system and method |
| CN108169249A (en) * | 2017-12-21 | 2018-06-15 | 四川大学 | A kind of microwave interdigital structure non-destructive control probe |
| CN111122611A (en) * | 2020-01-08 | 2020-05-08 | 大连理工大学 | Steel structure corrosion detection method based on microwave technology |
-
2021
- 2021-04-30 CN CN202110482762.XA patent/CN113186995A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070220946A1 (en) * | 2006-03-03 | 2007-09-27 | Joseph Pecina | Processes to create discrete corrosion defects on substrates and establish corrosion NDI test standards |
| CN102706901A (en) * | 2012-06-01 | 2012-10-03 | 刘马宝 | Microwave non-destructive testing device and method for metal structure corrosion under protection layer |
| CN104964990A (en) * | 2015-06-03 | 2015-10-07 | 北京理工大学 | Via-hole split ring resonator (VSRR) loaded waveguide probe used for detection of defect on metal surface |
| CN107703159A (en) * | 2017-09-27 | 2018-02-16 | 山东省科学院激光研究所 | Inner-walls of duct detecting system and method |
| CN108169249A (en) * | 2017-12-21 | 2018-06-15 | 四川大学 | A kind of microwave interdigital structure non-destructive control probe |
| CN111122611A (en) * | 2020-01-08 | 2020-05-08 | 大连理工大学 | Steel structure corrosion detection method based on microwave technology |
Non-Patent Citations (2)
| Title |
|---|
| 刘罡等: "《电磁波与光学实验教程》", 31 August 2020, 江苏大学出版社 * |
| 王美琦: "基于微波技术的金属表面缺陷检测方法研究", 《中国优秀硕士学位论文全文数据库（电子期刊）-工程科技Ⅰ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018953A (en) * | 2021-10-18 | 2022-02-08 | 浙江武义电气安装工程有限公司 | Reinforced concrete foundation corrosion detection method and system based on microwave transmission method |
| CN116930215A (en) * | 2023-09-18 | 2023-10-24 | 山东创瑞激光科技有限公司 | SLM powder layer defect recognition system and method based on microwave detection |
| CN116930215B (en) * | 2023-09-18 | 2023-12-08 | 山东创瑞激光科技有限公司 | SLM powder layer defect recognition system and method based on microwave detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7389693B2 (en) | Methods and apparatus for porosity measurement | |
| Zhang et al. | Efficient immersion imaging of components with nonplanar surfaces | |
| CN113186995A (en) | Reinforced concrete foundation corrosion detection system and method based on microwave reflection coefficient | |
| WO2022016726A1 (en) | Crack morphology reconstruction method based on composite-mode total focusing | |
| CN103267807B (en) | Probe scaling method in a kind of ultrasonic detecting equipment and device | |
| AU2009201801A1 (en) | Flaw detection testing method | |
| CN107356670A (en) | A kind of ultrasonic phase array weld defect detection method based on oblique incidence | |
| US20230061816A1 (en) | Air-coupled Ultrasonic Detection Method and Device Based on Defect Probability Reconstruction Algorithm | |
| CN110988139A (en) | Phased array ultrasonic detection method for welding buoy base plate and sampan | |
| CN113325079A (en) | Concrete crack absolute size quantitative detection method based on Rayleigh wave energy attenuation | |
| CN115166051A (en) | Method for measuring elastic constant of fiber reinforced resin matrix composite material | |
| CN106645213A (en) | Microwave detection probe and method for metal plate surface corrosion defect detection and evaluation | |
| CN103529123A (en) | Dual-probe manual ultrasonic detection method | |
| CN113686963B (en) | Method for detecting compactness of self-compacting concrete filled steel tube special-shaped column | |
| CN111665296A (en) | Method and device for measuring three-dimensional radiation sound field of ultrasonic transducer based on EMAT | |
| CN113899815A (en) | 126kV three-phase common-box basin-type insulator interface defect detection method | |
| CN112162036A (en) | Health monitoring system and method for regular triangle phased array bolt fastening structure | |
| CN115753838A (en) | Reflective corrosion detection method and device suitable for annular steel bar structure tower | |
| JPH0750074B2 (en) | Eddy current flaw detector capable of thinning inspection | |
| JP5750066B2 (en) | Non-destructive inspection method using guided waves | |
| CN115327328B (en) | Ultrasonic detection method and device for interface defects of asymmetric epoxy-conductor insert | |
| CN214097284U (en) | System for measuring ultrasonic transverse wave attenuation coefficients at different temperatures | |
| CN217521085U (en) | Ultrasonic stress transducer directivity measuring device | |
| CN114018953A (en) | Reinforced concrete foundation corrosion detection method and system based on microwave transmission method | |
| CN213398333U (en) | System for detecting circumferential defects on inner arc surface of small-diameter pipe elbow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210730 |