CN117629097A - Beam-slab structure steel bar corrosion detection method and detection device - Google Patents
Beam-slab structure steel bar corrosion detection method and detection device Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 121
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- 230000007797 corrosion Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 claims abstract description 22
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 18
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 48
- 239000004567 concrete Substances 0.000 claims description 42
- 238000005336 cracking Methods 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 13
- 238000007405 data analysis Methods 0.000 claims description 13
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- 238000003384 imaging method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
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- 150000001875 compounds Chemical class 0.000 description 1
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Abstract
The invention discloses a beam plate type structural steel bar corrosion detection method and a detection device. According to the detection method, the quantitative relation between the corrosion rate of the steel bars and the deformation corresponding to the center line cutting position of the steel bars on the surface of the beam-slab structure is established, and the deformation corresponding to the center line cutting position of the steel bars on the surface of the beam-slab structure is detected by the detection device to obtain the corrosion rate of the steel bars, so that the corrosion damage of the reinforced concrete structure is detected by an efficient, rapid and lossless method.
Description
Technical Field
The invention relates to a detection technology, in particular to a beam plate type structural steel bar corrosion detection method and a detection device.
Background
The reinforced concrete structure has the non-negligible defects, particularly in the coastal areas of the south, the structure is corroded by chloride ions in the coastal environment atmosphere and the chloride ions carried by non-standard treatment of raw materials, under the combined action of rainy and humid weather in the south, steel bars in the concrete are corroded to further cause the structural performance degradation, the influence of the steel bar degradation on the structure is serious, the bearing capacity is reduced, the ductility is attenuated, the brittle failure of the structure is further caused, the life safety and the property safety of human beings are threatened to a great extent, and therefore, the steel bar corrosion problem under the action of the corrosive environment such as the coastal environment can be seen to have great harm. For the existing civil structures such as beam-slab structures, buildings and the like, if the corrosion of the steel bars in the concrete is not exposed, the corrosion is difficult to observe by naked eyes, and the potential safety risk is greatly increased. With the gradual awareness of the severity and popularity of the rust problem of reinforced concrete, people are not naturally concerned about whether the problem exists in the living and working places, so that it is necessary to find an efficient, rapid and nondestructive method for detecting the rust damage of the reinforced concrete structure so as to discover in advance and take measures as soon as possible.
In actual engineering, the deformation of the corresponding position of the center line of the steel bar on the surface of the beam-slab structure can be directly measured, and the corrosion rate of the steel bar is difficult to be obtained by direct measurement under the condition of not damaging the structure, and the corrosion rate of the steel bar is an important index for evaluating the safety of the beam-slab structure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a beam plate type structural steel bar corrosion detection method. The beam plate type structural steel bar corrosion detection method is simple in structure, convenient to carry and capable of improving detection work efficiency.
The invention further aims to provide a detection device for rust corrosion of the steel bars of the beam-slab type structure.
The aim of the invention is achieved by the following technical scheme: the beam plate type structural steel bar corrosion detection method comprises the following steps:
s1, measuring the position of a central cutting line of a surface steel bar of a beam plate structure and the corresponding single cutting line deformation at two sides H/2 and H away from the central cutting line by adopting a detection device, and determining the radial deformation u of the concrete around the steel bar caused by corrosion of the steel bar based on all the single cutting line deformation;
s2, the rust etching of the steel bar is divided into a steel bar dulling, rust occurrence and free expansion starting, a hoop stress generation stage and a rust expansion cracking stage, wherein the rust occurrence and free expansion starting, the hoop stress generation stage and the rust expansion cracking stage can generate rust products to cause the volume deformation of the steel bar; the process of corroding the steel bars inside the beam plate type structure is uniformly rusted, and the method is characterized in that:
rust product volume at the stage where rust occurs and free expansion begins:
V1＝2ΠRx0+Vs1
wherein V1 is the volume of a rusted product in the stage of rusting and starting free expansion, R is the radius before the steel bar is not rusted, x0 is the uniform micro-void thickness of concrete around the steel bar, and Vs1 is the rusted volume in the diameter range of the steel bar in a set unit length in the stage of rusting and starting free expansion;
s3, setting the volume of the concrete around the steel bar in unit length expanded outwards under the expansion action of the corrosion product as Vc, and calculating the radial deformation u of the concrete around the steel bar caused by the corrosion of the steel bar to obtain:
Vc＝2ΠRu，
correcting Vc through finite element software to obtain:
Vc′＝2ΠRu*ω＝2ωΠRu
vc' is the correction of Vc, and ω is the correction coefficient;
and setting the corrosion volume in the diameter range of the steel bar in unit length in the hoop stress generation stage and the rust expansion cracking stage to be Vs2, so as to obtain the corrosion product volume in the hoop stress generation stage and the rust expansion cracking stage:
V2＝Vc′+Vs2
wherein V2 is the volume of a rusted product in a hoop stress generation stage and a rusted expansion cracking stage, and Vc' is the volume of concrete around a rusted steel bar in unit length expanding outwards under the expansion action of the rusted product;
s4, based on the step S2 and the step S3, the total volume of the rusted product after the steel bar inside the concrete is rusted is as follows:
vr=v1+v2=2n Rx0+vs1+vs2+vc' =2n Rx0+vs+2ω n ruvs=vs1+vs2, vs being the total rust volume per unit length within the diameter of the bar;
s5, under the actual condition, steel bar corrosion of the beam slab type concrete structure is often corroded along with stirrups, the stirrups are arranged at the outer layer positions of the steel bars, and the total corrosion product volume of the stirrups is as follows:
wherein R is gu Is the radius of the stirrup;
the total volume of the rusted product after the rusting of the steel bars in the concrete after the rusting of the stirrups is considered is as follows:
s6, enabling the corrosion expansion rate of the steel bar to be beta, wherein the following steps are as follows:
vr' =βvs, wherein Vs is the total rust volume per unit length over the diameter of the bar;
thereby obtaining the following steps:
s7, evaluating coefficients based on experimentsAnd correcting Vs to obtain:
the corrosion rate eta of the steel bar is obtained as follows:
preferably, the detection device comprises a lifting bracket, a sliding groove, a sliding block, a winch, a detection unit and a data analysis processing unit, wherein the sliding groove is arranged at the upper end of the lifting bracket, the sliding block is arranged in the sliding groove, and the sliding block is connected with the winch through a wire; the detection unit comprises an industrial camera, 3 line laser projectors and 5 laser sensors, wherein the laser sensors, the line laser projectors and the industrial camera are all arranged on the sliding block, and the laser sensors, the line laser projectors and the industrial camera are sequentially distributed along the axial direction of the sliding groove;
the 5 laser sensors are distributed in a row along the axis direction of the vertical chute, the 3 line laser projectors are distributed in a row along the axis direction of the vertical chute, and the laser sensor positioned in the middle, the line laser projector positioned in the middle and the industrial camera are all positioned on the central line of the sliding block; the distance between adjacent 2 laser sensors is H/2, and the distance between adjacent 2 line laser projectors is H;
and the laser sensor and the industrial camera are connected with the data analysis processing unit through the signal collector.
Preferably, in step S1, the determination process of the radial deformation u includes the steps of:
s11, taking data of 5 single-section line deformation obtained based on the detection device as y coordinates, and taking the longitudinal length of the beam plate structure as x seatMarking to establish a two-dimensional line graph to determine the transverse maximum deformation u of the beam-slab structure x ；
S12, enabling the deflection value of the abscissa x at any position on the beam plate structure to be delta y, and then:
wherein ρ is the density of the structure, I is the moment of inertia, E is the elastic modulus, L is the span length of the structure, x is the distance from the initial measurement point to the measurement point at any position along the longitudinal direction of the beam-slab structure;
s13, enabling the acting force applied to the beam-plate structure to be F, enabling the acting force F to be perpendicular to a stress surface of the beam-plate structure, enabling the distance between an acting point of the acting force F and supporting points at two ends of the beam-plate structure to be L1 and L2 respectively, and enabling a deflection value deltay of an abscissa x at any position on a structural body to be expressed as:
when x is more than or equal to 0 and less than or equal to L1,
when L1 is more than or equal to x is more than or equal to L,
and comprehensively considering the combined action of the self weight and external load of the beam-plate structure, the deflection value deltay of the beam-plate structure in the vertical direction is as follows:
when x is more than or equal to 0 and less than or equal to L1,
when L1 is more than or equal to x is more than or equal to L,
s14, measuring the surface steel of the beam plate type structure according to the siteDeflection value data of longitudinal distribution of the rib center line position is made into x-axis by EXCEL, deflection value is made into x-axis, and maximum deformation u of the beam-plate structure in the longitudinal direction is calculated y Taking the maximum deformation u y The difference from the deflection value deltay is taken as the effective maximum deformation u'; the u is the most taken x And u' as a radial deformation of the reinforced peripheral concrete caused by rust of the reinforced bar;
s15, splicing the image data by combining the image data acquired by the industrial camera in the detection device, so as to evaluate the missing condition and crack development condition of the concrete protection layer of the beam-slab structure, and further correct the radial deformation of the reinforced concrete to obtain the final radial deformation u.
Preferably, the single-section line deformation determination in step S1 is as follows:
s101, moving a detection device to an initial position below the beam-plate structure, wherein the surface distance between an industrial camera in the detection device and the beam-plate structure is d, the distance between the initial position and the nearest end part in the axial direction of the beam-plate structure is L, the axial length of the beam-plate structure is nL, n is a natural number, and:θ and α refer to the horizontal and vertical angles of view inherent to industrial cameras, respectively;
s102, driving a laser sensor and an industrial camera in a detection device to move at a certain speed along the axial direction of the beam-slab structure, and automatically measuring the corresponding deformation of the beam-slab structure surface steel bar center line cutting position and the H/2 and H positions at the two sides of the beam-slab structure surface steel bar center line cutting position by 5 laser ranging sensors along with the movement.
Preferably, in step S102, the industrial camera takes a picture at an initial position and then at intervals of 2L.
The detection device for the rust of the beam plate type structural steel bar comprises a lifting bracket, a sliding groove, a sliding block, a winch, a detection unit and a data analysis and processing unit, wherein the sliding groove is arranged at the upper end of the lifting bracket, the sliding block is arranged in the sliding groove, and the sliding block is connected with the winch through a wire;
the detection unit comprises an industrial camera, 3 line laser projectors and 5 laser sensors, wherein the laser sensors, the line laser projectors and the industrial camera are all arranged on the sliding block, and the laser sensors, the line laser projectors and the industrial camera are sequentially distributed along the axial direction of the sliding groove;
the 5 laser sensors are distributed in a row along the axis direction of the vertical chute, the 3 line laser projectors are distributed in a row along the axis direction of the vertical chute, and the laser sensor positioned in the middle, the line laser projector positioned in the middle and the industrial camera are all positioned on the central line of the sliding block; the distance between adjacent 2 laser sensors is H/2, and the distance between adjacent 2 line laser projectors is H;
and the laser sensor and the industrial camera are connected with the data analysis processing unit through the signal collector.
Preferably, the sliding chute comprises a main body and a supporting block connected with the sliding block, wherein a T-shaped groove is arranged in the main block, and the T-shaped groove extends along the axis of the main body; the supporting block is arranged in the T-shaped groove, pulleys are arranged on the bottom surface and the two side surfaces of the supporting block, and the supporting block is connected with the T-shaped groove through the pulleys.
Preferably, the main body is provided with a plurality of sections, and the sections of main bodies are connected through a splicing mechanism.
Preferably, the lifting support comprises 2 support frames, each support frame comprises a base, a telescopic rod and a support connected with the corresponding sliding groove, rollers are arranged at the lower end of the base, and the upper end and the lower end of the telescopic rod are connected with the base and the support respectively.
Compared with the prior art, the invention has the following advantages:
1. the invention establishes the quantitative relation between the steel bar corrosion rate and the deformation corresponding to the beam plate structure surface steel bar center line cutting position, and obtains the steel bar corrosion rate by measuring the deformation corresponding to the beam plate structure surface steel bar center line cutting position through the detection device, thereby realizing the efficient, rapid and nondestructive method for detecting the corrosion damage of the reinforced concrete structure.
2. According to the method, on the basis of the problem of establishing the quantitative relation between the steel bar corrosion rate and the deformation corresponding to the beam slab structure surface steel bar center line position, the stirrup corrosion superposition effect is mainly considered, a plurality of adjacent steel bar corrosion superposition effects are obtained through calculation according to ANSYS finite element software, the deformation corresponding to the beam slab structure deflection value obtained through on-site verification is corrected according to theoretical calculation, and finally, the parameter result is corrected through correction of local cracks and concrete protection layer falling through on-site photographic images, so that the detection accuracy is improved.
The detection device mainly comprises the lifting bracket, the sliding groove, the sliding block, the winch, the detection unit and the data analysis processing unit, and can be quickly built on site to realize the effects of high efficiency, high speed and no damage.
Drawings
Fig. 1 is a schematic structural view of a beam slab structural steel bar corrosion detection device of the invention.
Fig. 2 is a schematic diagram of a testing process of the beam-slab structural steel bar rust detection device of the invention.
Fig. 3 is a schematic diagram of a detection unit of the present invention.
Fig. 4 is a cross-sectional view of the chute of the present invention.
Fig. 5 is a schematic diagram of the connection of the segments of the present invention.
Fig. 6 is a schematic view of a uniform rust-corrosion plane of the steel bar.
Fig. 7 is a line drawing of a deformation measurement for determining the transverse direction of a beam-to-slab structure in accordance with the present invention.
Fig. 8 is a line drawing of a deformation measurement line defining the longitudinal direction of a beam-slab structure in accordance with the present invention.
Wherein 1 is a lifting bracket, 2 is a chute, 3 is a slide block, 4 is a winch, 5 is a detection unit, 6 is a data analysis processing unit, 7 is an industrial camera, 8 is a line laser projector, 9 is a laser sensor, 10 is a signal collector, 11 is a main body, 12 is a supporting block, 13 is a T-shaped groove, 14 is a pulley, 15 is a splicing mechanism, 16 is a supporting frame, 17 is a base, 18 is a telescopic rod, 19 is a support, 20 is a roller, 21 is a wire, 22 is a beam plate structure, 23 is an area within the diameter range of the steel bar, and 24 is a radial deformation area of concrete around the steel bar.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 to 3, the detection device for rust of the beam slab type structural steel bar comprises a lifting bracket, a sliding groove, a sliding block, a winch, a detection unit and a data analysis and processing unit, wherein the sliding groove is arranged at the upper end of the lifting bracket, the sliding block is arranged in the sliding groove, and the sliding block is connected with the winch through a wire;
the detection unit comprises an industrial camera, 3 line laser projectors and 5 laser sensors, wherein the laser sensors, the line laser projectors and the industrial camera are all arranged on the sliding block, and the laser sensors, the line laser projectors and the industrial camera are sequentially distributed along the axial direction of the sliding groove;
the 5 laser sensors are distributed in a row along the axis direction of the vertical chute, the 3 line laser projectors are distributed in a row along the axis direction of the vertical chute, and the laser sensor positioned in the middle, the line laser projector positioned in the middle and the industrial camera are all positioned on the central line of the sliding block; the distance between adjacent 2 laser sensors is H/2, and the distance between adjacent 2 line laser projectors is H;
and the laser sensor and the industrial camera are connected with the data analysis processing unit through the signal collector.
Specifically, the value of H is determined by parameters of the industrial camera. The industrial phase in this example has a transverse actual field of view of 2L and a longitudinal actual field of view of 2h+200mm. The data analysis processing unit in this embodiment adopts a computer or a handheld mobile terminal (such as a tablet).
In the measuring process, 5 single-section line deformation of 5 single-beam plate structures is detected by 5 laser sensors. The method comprises the steps that 5 laser sensors collect distance data of each single profile line of a beam-slab structure, the data are transmitted to a computer through a signal collector, after the computer converts the data into a file format, a two-dimensional line graph is built by taking the longitudinal length of the beam-slab structure as an x coordinate and taking data of 5 single profile line deformation as a y coordinate through EXCEL software, so that the single profile line deformation is determined. In order to improve the accuracy of single-profile deformation, the application also adopts a line laser projector to map projection lines for assistance. In order to further improve the accuracy, the single-section line deformation determined by the laser sensor is corrected by the image data acquired by the industrial camera. The imaging device, the laser ranging sensor and the line laser projection line are used for imaging measurement in a specified range of auxiliary adjustment errors, and the measurement result is high in precision and cannot damage a building.
As shown in fig. 4, the sliding chute comprises a main body and a supporting block connected with the sliding block, wherein a T-shaped groove is arranged in the main block, and the T-shaped groove extends along the axis of the main body; the supporting block is arranged in the T-shaped groove, pulleys are arranged on the bottom surface and the two side surfaces of the supporting block, and the supporting block is connected with the T-shaped groove through the pulleys. The structure is simple, and the stable movement of the detection unit arranged on the sliding block is ensured, so that the detection accuracy is improved.
As shown in fig. 5, the main body has a plurality of sections, and the sections are connected by a splicing mechanism. The adoption of the multi-section structure ensures the convenience of transportation and also ensures that the formed measuring device can meet the beam-slab structure with different sizes. The splicing mechanism mainly comprises a U-shaped plate and bolts. One end of each 2 adjacent sections of main bodies is arranged in the groove of the U-shaped plate, and the U-shaped plates are connected with the main bodies through bolts.
The lifting support comprises 2 support frames, each support frame comprises a base, a telescopic rod and a support connected with a sliding groove, rollers are arranged at the lower end of the base, and the upper end and the lower end of the telescopic rod are connected with the base and the support respectively. The structure is simple, and the stable rising and falling of the detection unit can be ensured. Meanwhile, the arrangement of the rollers can ensure that the whole measuring device is convenient to move.
The beam plate type structural steel bar corrosion detection method comprises the following steps:
s1, measuring the position of a central cutting line of a surface steel bar of a beam plate structure and the corresponding single cutting line deformation at two sides H/2 and H away from the central cutting line by adopting a detection device, and determining the radial deformation u of the concrete around the steel bar caused by corrosion of the steel bar based on all the single cutting line deformation;
the single-section line deformation determination process in the step S1 is as follows:
s101, moving a detection device to an initial position below the beam-plate structure, wherein the surface distance between an industrial camera in the detection device and the beam-plate structure is d, the distance between the initial position and the nearest end part in the axial direction of the beam-plate structure is L, the axial length of the beam-plate structure is nL, n is a natural number, and:θ and α refer to the horizontal and vertical angles of view inherent to industrial cameras, respectively;
specifically, firstly lifting the electromagnetic induction type steel bar scanner, enabling the electromagnetic induction type steel bar scanner to be aligned to an irregular corrosion protruding area of the beam-slab structure, lifting the chute, enabling the pulley of the electromagnetic induction type steel bar scanner to be attached to the bottom of the beam-slab structure, then detecting the surface of the beam-slab structure in a site where steel bars are corroded to be suspicious, and positioning the center line of the steel bars on the surface of the beam-slab structure;
and (3) building a detection device, lifting the chute, enabling the axis of the chute to be perpendicular to the length direction of the beam-slab structure, and lifting the chute, so that the distance between the industrial camera on the chute and the bottom plate of the beam-slab structure is d. And 3 line laser projectors in the detection device map 3 lines on the bottom plate of the beam plate type structure, wherein the 3 lines are respectively positioned at the center line of the steel bar and the positions of the left side and the right side H away from the center line of the steel bar. The three laser lines are mainly used for assisting in the precision adjustment of the image, and are mainly used for correcting the deviation according to the fluctuation displacement of the three laser lines in the imaging picture so as to ensure that the images acquired by the industrial camera are spliced more accurately.
S102, driving a laser sensor and an industrial camera in a detection device to move at a certain speed along the axial direction of the beam-slab structure, and automatically measuring the corresponding deformation of the beam-slab structure surface steel bar center line cutting position and the H/2 and H positions at the two sides of the beam-slab structure surface steel bar center line cutting position by 5 laser ranging sensors along with the movement. In step S102, the industrial camera takes a picture at an initial position and then at intervals of 2L.
When the measurement is started, the 5 laser ranging sensors and the industrial camera are started, then the winding is carried out through the winch according to a certain speed, so that the detection mechanism formed by the laser ranging sensors, the industrial camera and the like moves according to a certain speed, and the 5 laser ranging sensors automatically measure the position of the beam plate type structural surface steel bar center profile line and the corresponding deformation quantity at the positions H/2 and H away from the two sides of the beam plate type structural surface along with the movement, so that 5 single profile line deformation quantities are obtained. And in order to better splice the images acquired by the industrial camera, the industrial camera shoots every 2L of distance to acquire the images. The moving distance of the industrial camera is determined according to the parameters thereof, and as the industrial image in the present embodiment, the transverse actual field of view size is 2L and the longitudinal actual field of view size is 2h+200mm.
In step S1, the determination process of the radial deformation u includes the steps of:
s11, taking data of 5 single-section line deformation obtained based on the detection device as a y coordinate, and taking the longitudinal length of the beam-plate structure as an x coordinate to establish a two-dimensional line graph so as to determine the transverse maximum deformation u of the beam-plate structure x As shown in fig. 7;
s12, enabling the deflection value of the abscissa x at any position on the beam plate structure to be delta y, and then:
wherein ρ is the density of the structure, I is the moment of inertia, E is the elastic modulus, L is the span length of the structure, x is the distance from the initial measurement point to the measurement point at any position along the longitudinal direction of the beam-slab structure;
specifically, the single profile line deformation corresponding to the two sides H of the profile line position of the center of the steel bar of the beam plate type structure is used as a site live condition for checking the deflection theoretical value, and the smaller value of the single profile line deformation and the site live condition is used as the deflection value calculated at this time. Wherein, the calculation formula of the deflection theoretical value is as follows:
when the beam type concrete structure is acted by self gravity, as the acting force is uniformly distributed at each position of the structure body, the deflection value deltay of the abscissa x of any position on the beam type concrete structure can be calculated according to the material mechanics by the following formula:
s13, when an external load is applied to the structural body, the structural body deforms under the action of force. Let the effort applied on the beam-slab structure be F, and this effort F is perpendicular with the atress face of beam-slab structure, and the distance of the action point of this effort F and the both ends supporting point of beam-slab structure be L1 and L2 respectively, then the deflection value deltay of arbitrary position abscissa x on the structure body under effort F can be expressed as:
when x is more than or equal to 0 and less than or equal to L1,
when L1 is more than or equal to x is more than or equal to L,
and comprehensively considering the combined action of the self weight and external load of the beam-plate structure, the deflection value deltay of the beam-plate structure in the vertical direction is as follows:
when x is more than or equal to 0 and less than or equal to L1,
when L1 is more than or equal to x is more than or equal to L,
s14, according to deflection value data of the beam plate structure surface steel bar center section line position measured on site and distributed along the longitudinal direction, an abscissa is x and an ordinate is deflection value are made through EXCEL, and the longitudinal maximum deformation u of the beam plate structure is calculated y Taking the maximum deformation u y As a difference from the deflection value DeltayEffective maximum deformation u'; the u is the most taken x And u' as a radial deformation of the reinforced peripheral concrete caused by rust of the reinforced bar;
specifically, the single profile line deformation corresponding to the two sides H of the profile line position of the center of the steel bar of the beam plate type structure is used as a site live condition for checking the deflection theoretical value, and the smaller value of the single profile line deformation and the site live condition is used as the deflection value calculated at this time. After determining Δy corresponding to x, as shown in FIG. 8, the maximum deformation u in the longitudinal direction of the beam-plate structure is calculated from the EXCEL data map y . Taking the maximum deformation u y The difference from the deflection value deltay is taken as the effective maximum deflection u'. Finally, taking u x And u' as the radial deformation u of the reinforced peripheral concrete caused by rust of the reinforcing steel bar.
S15, splicing the image data by combining the image data acquired by the industrial camera in the detection device, so as to evaluate the missing condition and crack development condition of the concrete protection layer of the beam-slab structure, and further correct the radial deformation of the reinforced concrete to obtain the final radial deformation u.
S2, the steel bar rust etching is divided into a steel bar dulling, rust occurrence and start free expansion, a hoop stress generation stage and a rust expansion cracking stage, wherein the rust occurrence and start free expansion, the hoop stress generation stage and the rust expansion cracking stage can generate rust products to cause the steel bar volume deformation, the rust generated after the steel bar rust etching is a non-sticky and non-compressive compound, and the volume of a rust generated after the steel bar rust etching is 2-4 times of the volume of the steel bar when the steel bar is not corroded originally; the process of corroding the steel bars inside the beam plate type structure is uniform corrosion, as shown in the following figure 6, the relationship between the deformation corresponding to the center line cutting position of the steel bars on the surface of the beam plate type structure and the corrosion rate caused by corrosion of the steel bars is analyzed, and the following relationship is obtained:
the corrosion occurs and free expansion is started without generating expansion stress, which is the process of filling concrete pores and gaps around the steel bar with corrosion products, and the volume of the corrosion products at the stage of the corrosion occurs and free expansion is started:
V1＝2ΠRx0+Vs1
wherein V1 is the volume of the rusted product at the stage of rusting and starting free expansion, R is the radius before the steel bar is rusted, x0 is the uniform micro-void thickness of concrete around the steel bar, x0 can be an empirical value, in the embodiment, x0 is 12.5 mu m, and Vs1 is the volume of the rusted product within the diameter range of the steel bar in a set unit length at the stage of rusting and starting free expansion;
s3, the beam plate type structural concrete is deformed in the hoop stress generation stage, the volume of concrete around the rusted steel bar in unit length expanding outwards under the expansion action of the rusted product is set to be Vc, and the radial deformation u of the concrete around the steel bar caused by the corrosion of the steel bar is calculated and known:
Vc＝2ΠRu，
in the practical situation, the steel bars of the beam slab type concrete structure are arranged at intervals continuously, so that the beam slab type concrete structure under the condition of a plurality of steel bars is analyzed through finite element software ANSYS, when the horizontal direction clear distance of the rusted steel bars is larger (s/c is more than 3), the uneven rusting superposition effect of adjacent steel bars is not considered, when the horizontal direction clear distance of the rusted steel bars is smaller (s/c is less than or equal to 3), the uneven rusting superposition effect of the adjacent steel bars is considered, s is a design value of the horizontal direction clear distance of the steel bars, c is a design value of the thickness of a concrete protective layer, the volume of the adjacent steel bars, which expands outwards, is calculated through the ANSYS software, so that an amplification factor (namely, correction factor omega, the general correction factor omega is 1-10/7, and the correction factor omega of the implementation is 10/7. Vc is corrected through the finite element software, so that:
Vc′＝2ΠRu*ω＝2ωΠRu
vc' is the correction of Vc, ω=10/7;
and setting the corrosion volume in the diameter range of the steel bar in unit length in the hoop stress generation stage and the rust expansion cracking stage to be Vs2, so as to obtain the corrosion product volume in the hoop stress generation stage and the rust expansion cracking stage:
V2＝Vc′+Vs2
wherein V2 is the volume of a rusted product in a hoop stress generation stage and a rusted expansion cracking stage, and Vc' is the volume of concrete around a rusted steel bar in unit length expanding outwards under the expansion action of the rusted product;
s4, based on the step S2 and the step S3, the total volume of the rusted product after the steel bar inside the concrete is rusted is as follows:
vr=v1+v2=2n Rx0+vs1+vs2+vc' =2n Rx0+vs+2ω n ruvs=vs1+vs2, vs being the total rust volume per unit length within the diameter of the bar;
s5, under the actual condition, steel bar corrosion of the beam slab type concrete structure is often corroded along with stirrups, the stirrups are arranged at the outer layer positions of the steel bars, and the total corrosion product volume of the stirrups is as follows:
wherein R is gu Is the radius of the stirrup;
the total volume of the rusted product after the rusting of the steel bars in the concrete after the rusting of the stirrups is considered is as follows:
s6, enabling the corrosion expansion rate of the steel bar to be beta, wherein the following steps are as follows: vr' =βvs, wherein Vs is the total rust volume per unit length over the diameter of the bar; wherein, beta can be between 2 and 4 according to the existing indoor experimental research results, and generally 2 is taken;
thereby obtaining the following steps:
s7, evaluating coefficients based on experimentsAnd correcting Vs to obtain:
the corrosion rate eta of the steel bar is obtained as follows:
the above embodiments are preferred examples of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions made without departing from the technical aspects of the present invention are included in the scope of the present invention.
Claims (9)
1. The beam plate type structural steel bar corrosion detection method is characterized by comprising the following steps of: the method comprises the following steps:
s1, measuring the position of a central cutting line of a surface steel bar of a beam plate structure and the corresponding single cutting line deformation at two sides H/2 and H away from the central cutting line by adopting a detection device, and determining the radial deformation u of the concrete around the steel bar caused by corrosion of the steel bar based on all the single cutting line deformation;
s2, the rust etching of the steel bar is divided into a steel bar dulling, rust occurrence and free expansion starting, a hoop stress generation stage and a rust expansion cracking stage, wherein the rust occurrence and free expansion starting, the hoop stress generation stage and the rust expansion cracking stage can generate rust products to cause the volume deformation of the steel bar; the process of corroding the steel bars inside the beam plate type structure is uniformly rusted, and the method is characterized in that:
rust product volume at the stage where rust occurs and free expansion begins:
V1＝2ΠRx0+Vs1，
wherein V1 is the volume of a rusted product in the stage of rusting and starting free expansion, R is the radius before the steel bar is not rusted, x0 is the uniform micro-void thickness of concrete around the steel bar, and Vs1 is the rusted volume in the diameter range of the steel bar in a set unit length in the stage of rusting and starting free expansion;
s3, setting the volume of the concrete around the steel bar in unit length expanded outwards under the expansion action of the corrosion product as Vc, and calculating the radial deformation u of the concrete around the steel bar caused by the corrosion of the steel bar to obtain:
VC＝2ΠRu，
correcting Vc through finite element software to obtain:
VC′＝2ΠRu*ω＝2ωΠRu，
vc' is the correction of Vc, and ω is the correction coefficient;
and setting the corrosion volume in the diameter range of the steel bar in unit length in the hoop stress generation stage and the rust expansion cracking stage to be Vs2, so as to obtain the corrosion product volume in the hoop stress generation stage and the rust expansion cracking stage:
V2＝Vc′+Vs2，
wherein V2 is the volume of a rusted product in a hoop stress generation stage and a rusted expansion cracking stage, and Vc' is the volume of concrete around a rusted steel bar in unit length expanding outwards under the expansion action of the rusted product;
s4, based on the step S2 and the step S3, the total volume of the rusted product after the steel bar inside the concrete is rusted is as follows:
vr=v1+v2=2n Rx0+vs1+vs2+vc' =2n Rx0+vs+2ωn Ru, vs=vs1+vs2vs being the total rust volume per unit length within the diameter range of the bar;
s5, under the actual condition, steel bar corrosion of the beam slab type concrete structure is often corroded along with stirrups, the stirrups are arranged at the outer layer positions of the steel bars, and the total corrosion product volume of the stirrups is as follows:
wherein R is gu Is the radius of the stirrup;
the total volume of the rusted product after the rusting of the steel bars in the concrete after the rusting of the stirrups is considered is as follows:
s6, enabling the corrosion expansion rate of the steel bar to be beta, wherein the following steps are as follows:
vr' =βvs, wherein Vs is the total rust volume per unit length over the diameter of the bar;
thereby obtaining the following steps:
s7, evaluating coefficients based on experimentsAnd correcting Vs to obtain:
the corrosion rate eta of the steel bar is obtained as follows:
2. the beam-slab structural steel bar corrosion detection method according to claim 1, wherein the method comprises the following steps: the detection device comprises a lifting bracket, a sliding groove, a sliding block, a winch, a detection unit and a data analysis and processing unit, wherein the sliding groove is arranged at the upper end of the lifting bracket, the sliding block is arranged in the sliding groove, and the sliding block is connected with the winch through a wire; the detection unit comprises an industrial camera, 3 line laser projectors and 5 laser sensors, wherein the laser sensors, the line laser projectors and the industrial camera are all arranged on the sliding block, and the laser sensors, the line laser projectors and the industrial camera are sequentially distributed along the axial direction of the sliding groove;
the 5 laser sensors are distributed in a row along the axis direction of the vertical chute, the 3 line laser projectors are distributed in a row along the axis direction of the vertical chute, and the laser sensor positioned in the middle, the line laser projector positioned in the middle and the industrial camera are all positioned on the central line of the sliding block; the distance between adjacent 2 laser sensors is H/2, and the distance between adjacent 2 line laser projectors is H;
and the laser sensor and the industrial camera are connected with the data analysis processing unit through the signal collector.
3. The beam-slab structural steel bar corrosion detection method according to claim 1, wherein the method comprises the following steps: in step S1, the determination process of the radial deformation u includes the steps of:
s11, taking data of 5 single-section line deformation obtained based on the detection device as a y coordinate, and taking the longitudinal length of the beam-plate structure as an x coordinate to establish a two-dimensional line graph so as to determine the transverse maximum deformation u of the beam-plate structure x ；
S12, enabling the deflection value of the abscissa x at any position on the beam plate structure to be delta y, and then:
wherein ρ is the density of the structure, I is the moment of inertia, E is the elastic modulus, L is the span length of the structure, x is the distance from the initial measurement point to the measurement point at any position along the longitudinal direction of the beam-slab structure;
s13, enabling the acting force applied to the beam-plate structure to be F, enabling the acting force F to be perpendicular to a stress surface of the beam-plate structure, enabling the distance between an acting point of the acting force F and supporting points at two ends of the beam-plate structure to be L1 and L2 respectively, and enabling a deflection value deltay of an abscissa x at any position on a structural body to be expressed as:
when x is more than or equal to 0 and less than or equal to L1,
when L1 is more than or equal to x is more than or equal to L,
and comprehensively considering the combined action of the self weight and external load of the beam-plate structure, the deflection value deltay of the beam-plate structure in the vertical direction is as follows:
when x is more than or equal to 0 and less than or equal to L1,
when L1 is more than or equal to x is more than or equal to L,
s14, according to deflection value data of the beam plate structure surface steel bar center section line position measured on site and distributed along the longitudinal direction, an abscissa is x and an ordinate is deflection value are made through EXCEL, and the longitudinal maximum deformation u of the beam plate structure is calculated y Taking the maximum deformation u y The difference from the deflection value deltay is taken as the effective maximum deformation u'; the u is the most taken x And u' as a radial deformation of the reinforced peripheral concrete caused by rust of the reinforced bar;
s14, splicing the image data by combining the image data acquired by the industrial camera in the detection device, so as to evaluate the missing condition and crack development condition of the concrete protection layer of the beam-slab structure, and further correct the radial deformation of the reinforced concrete to obtain the final radial deformation u.
4. The beam-slab structural steel bar corrosion detection method according to claim 1, wherein the method comprises the following steps:
the single-section line deformation determination process in the step S1 is as follows:
s101, moving the detection device to an initial position below the beam-slab structure, wherein the distance between the industrial camera in the detection device and the surface of the beam-slab structure is d, and the distance between the initial position and the nearest end part in the axis direction of the beam-slab structure is L, wherein the beam-slabThe axial length of the structure is nL, n is a natural number, and:θ and α refer to the horizontal and vertical angles of view inherent to industrial cameras, respectively;
s102, driving a laser sensor and an industrial camera in a detection device to move at a certain speed along the axial direction of the beam-slab structure, and automatically measuring the corresponding deformation of the beam-slab structure surface steel bar center line cutting position and the H/2 and H positions at the two sides of the beam-slab structure surface steel bar center line cutting position by 5 laser ranging sensors along with the movement.
5. The beam slab structural steel bar corrosion detection method according to claim 4, wherein: in step S102, the industrial camera takes a picture at an initial position and then at intervals of 2L.
6. Beam-slab formula structure reinforcing bar corrosion's detection device, its characterized in that: the device comprises a lifting bracket, a chute, a sliding block, a winch, a detection unit and a data analysis and processing unit, wherein the chute is arranged at the upper end of the lifting bracket, the sliding block is arranged in the chute, and the sliding block is connected with the winch through a wire;
the detection unit comprises an industrial camera, 3 line laser projectors and 5 laser sensors, wherein the laser sensors, the line laser projectors and the industrial camera are all arranged on the sliding block, and the laser sensors, the line laser projectors and the industrial camera are sequentially distributed along the axial direction of the sliding groove;
the 5 laser sensors are distributed in a row along the axis direction of the vertical chute, the 3 line laser projectors are distributed in a row along the axis direction of the vertical chute, and the laser sensor positioned in the middle, the line laser projector positioned in the middle and the industrial camera are all positioned on the central line of the sliding block; the distance between adjacent 2 laser sensors is H/2, and the distance between adjacent 2 line laser projectors is H;
and the laser sensor and the industrial camera are connected with the data analysis processing unit through the signal collector.
7. The beam-slab structural steel bar corrosion detection device according to claim 6, wherein: the sliding chute comprises a main body and a supporting block connected with the sliding block, a T-shaped groove is arranged in the main block, and the T-shaped groove extends along the axis of the main body; the supporting block is arranged in the T-shaped groove, pulleys are arranged on the bottom surface and the two side surfaces of the supporting block, and the supporting block is connected with the T-shaped groove through the pulleys.
8. The beam-slab structural steel bar corrosion detection device according to claim 6, wherein: the main body is provided with a plurality of sections, and the main bodies of the sections are connected through a splicing mechanism.
9. The beam-slab structural steel bar corrosion detection device according to claim 6, wherein: the lifting support comprises 2 support frames, each support frame comprises a base, a telescopic rod and a support connected with a sliding groove, rollers are arranged at the lower end of the base, and the upper end and the lower end of the telescopic rod are connected with the base and the support respectively.
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