CN217060037U - Suspension bridge steel bridge deck corrosion monitoring system - Google Patents
Suspension bridge steel bridge deck corrosion monitoring system Download PDFInfo
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- CN217060037U CN217060037U CN202220630913.1U CN202220630913U CN217060037U CN 217060037 U CN217060037 U CN 217060037U CN 202220630913 U CN202220630913 U CN 202220630913U CN 217060037 U CN217060037 U CN 217060037U
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Abstract
The utility model provides a suspension bridge steel bridge deck corrosion monitoring system, this suspension bridge steel bridge deck corrosion monitoring system is used for monitoring suspension bridge steel bridge deck structure's corrosion state, suspension bridge steel bridge deck structure includes the steel bridge floor and is located the layer of mating formation on the steel bridge floor, suspension bridge steel bridge deck corrosion monitoring system includes impedance monitoring devices and resistance monitoring devices, impedance monitoring devices includes impedance analysis appearance and impedance probe, impedance analysis appearance and impedance probe electricity are connected, resistance monitoring devices includes corrosion probe host computer and resistance probe, corrosion probe host computer and resistance probe electricity are connected, impedance probe and resistance probe all bury underground in the layer of mating formation. The utility model provides a suspension bridge steel bridge floor corrosion monitoring system can realize the monitoring to the ageing state on layer of mating formation and the corrosion state of steel bridge floor simultaneously, and greatly reduced digs out the frequency and the amount of labour of the corrosion state of layer verification steel bridge floor of mating formation.
Description
Technical Field
The utility model belongs to the technical field of bridge floor health detection technique of bridge engineering and specifically relates to a suspension bridge steel bridge face corrosion monitoring system is related to.
Background
The steel bridge deck pavement of the long-span bridge is an international difficult problem all the time, and the reason is that the steel bridge deck has small rigidity and large deformation, and asphalt pavement is required to have good deformation followability. The pavement layer is complex in stress and seriously influenced by temperature, and is easy to deform and damage under the action of horizontal shear stress. The steel bridge deck pavement research starts in the 60's of the 20 th century abroad, and the experimental research and the practical application are continuously developed in recent years domestically. At present, three paving materials, namely cast asphalt concrete, epoxy modified asphalt concrete and asphalt mastic gravel (SMA), are mainly used for paving asphalt on a steel bridge deck, and the three paving materials are greatly different in material composition, performance and construction process.
The steel box girder of the large-span suspension bridge is paved in China, and the TAF epoxy asphalt concrete is popular for paving at present. The pavement layer has short curing period (4-10d), and TAF epoxy asphalt concrete high-temperature construction (about 180 ℃) can remove moisture, thereby obviously reducing or avoiding bulge cracking diseases of the pavement layer. A typical pavement layer is composed of: (1) blasting sand on the steel bridge surface to remove rust to Sa2.5 grade; (2)3mm epoxy resin waterproof glue layer; (3)35mm epoxy asphalt concrete layer; (4)3mm epoxy resin waterproof glue layer; (5)35mm epoxy asphalt concrete layer.
Along with the increase of bridge traffic flow, the test that steel bridge deck pavement layer needs high temperature insolation simultaneously, and the bridge floor damages thereupon aggravation, and the destruction form generally appears the crack first, and the pavement layer became invalid after the crack development is intensive, appears the pot hole, and the pot hole of maintenance constantly increases along with the time lapse. Meanwhile, the pavement layer is also pushed and ruts appear sometimes, the occurrence of diseases such as cracking, pushing, crowding and the like of the downstream bridge deck pavement layer is more frequent, and particularly, the diseases are more easily caused after rain. The steel plate is easy to expose and rust after the pavement layer is damaged, so that the requirement of comfortable driving is difficult to meet, and the difficulty and the workload of maintenance are correspondingly increased.
The research on the steel bridge deck anticorrosion technology mainly focuses on the selection of the anticorrosion paint. But in the presence of water and air, the paint film surface is pulverized. Therefore, the key to the corrosion prevention of the steel bridge deck is to strengthen the waterproof function design in other layers of pavement so as to isolate the steel bridge deck from water and air in a relatively long period of time. Among them, the waterproof adhesive layer is one of the most important layers in the whole pavement in terms of the functions to be performed.
The prior art generally monitors the damage of the waterproof layer and does not mention the corrosion of the steel bridge deck plate and the measurement of the corrosion rate of the steel bridge deck plate. In fact, it often takes several quarters or even longer between failure of the waterproofing layer to develop corrosion pits in the steel deck. Only by monitoring the corrosion rate and the corrosion process parameters of the steel bridge deck, the corrosion occurrence amount of the steel plate can be evaluated, and then the bearing capacity change of the steel bridge deck is correspondingly judged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a suspension bridge steel bridge face corrosion monitoring system and method, aim at solving or at least part solve the not enough of above-mentioned background art existence, can realize simultaneously the monitoring to the ageing state on layer of mating formation and the corrosion state of steel bridge face, greatly reduced digs the frequency and the amount of labour of the corrosion state of layer verification steel bridge face of mating formation, plays the purpose that improves suspension bridge driving through rate simultaneously.
The utility model provides a suspension bridge steel bridge deck corrosion monitoring system for the corrosion state of monitoring suspension bridge steel bridge deck structure, suspension bridge steel bridge deck structure includes the steel bridge floor and is located layer of mating formation on the steel bridge deck, suspension bridge steel bridge deck corrosion monitoring system includes impedance monitoring devices and resistance monitoring devices, impedance monitoring devices includes impedance analysis appearance and impedance probe, the impedance analysis appearance with the impedance probe electricity is connected, resistance monitoring devices includes corrosion probe host computer and resistance probe, the corrosion probe host computer with the resistance probe electricity is connected, the impedance probe with the resistance probe all bury underground in the layer of mating formation.
Furthermore, the paving layer comprises at least one asphalt paving layer and at least one waterproof layer, the waterproof layer is located between the steel bridge deck and the asphalt paving layer, and the impedance probe and the resistance probe are buried in the waterproof layer.
Furthermore, the number of the asphalt pavement layer and the waterproof layer is multiple, the multiple asphalt pavement layers and the multiple waterproof layers are sequentially and alternately arranged, and the impedance probe and the resistance probe are buried in the waterproof layer at the bottommost layer.
Furthermore, the number of the asphalt pavement layer and the waterproof layer is multiple layers, the multiple layers of the asphalt pavement layer and the multiple layers of the waterproof layer are sequentially and alternately arranged, and each layer of the waterproof layer is internally provided with the impedance probe and the resistance probe.
Furthermore, the impedance probe and the resistance probe are both wire-shaped metal electrodes made of the same material as the steel bridge surface, and the diameter of the impedance probe and the diameter of the resistance probe do not exceed the thickness of the waterproof layer.
Furthermore, the diameter of the impedance probe and the diameter of the resistance probe are both 0.5-4 mm, and the length of the impedance probe and the length of the resistance probe are both 0.5-10 m.
Furthermore, the resistance probe comprises a reference resistance probe and a sensing resistance probe, the reference resistance probe and the sensing resistance probe are electrically connected with the corrosion probe host, and the reference resistance probe and the sensing resistance probe are buried in the pavement layer.
Furthermore, the size and the material of the reference resistance probe and the sensing resistance probe are the same, and the outer surface of the reference resistance probe is wrapped with an insulating sealing material.
Further, the reference resistance probe and the sensing resistance probe are arranged in a fan shape in the pavement layer.
Furthermore, suspension cable bridge steel bridge face corrosion monitoring system still includes wireless transceiver, wireless transceiver simultaneously with impedance analysis appearance with the corrosion probe host computer signal connection.
The utility model also provides a suspension bridge steel bridge floor corrosion monitoring method, apply to above suspension bridge steel bridge floor corrosion monitoring system, suspension bridge steel bridge floor corrosion monitoring method includes:
the method comprises the steps of burying an impedance probe and a resistance probe in a pavement layer, measuring the corrosion rate of the resistance probe, simultaneously measuring the impedance value of the pavement layer by using the impedance probe, and evaluating the aging state of the pavement layer and the corrosion state of a steel bridge deck by monitoring the impedance value of the pavement layer and the corrosion rate of the resistance probe.
Furthermore, the pavement layer comprises at least one asphalt pavement layer and at least one waterproof layer, the waterproof layer is positioned between the steel bridge deck and the asphalt pavement layer, and the method for monitoring the corrosion of the steel bridge deck of the suspension bridge further comprises the following steps:
burying the impedance probe and the resistance probe in the waterproof layer, measuring the corrosion rate of the resistance probe, simultaneously measuring the impedance value of the waterproof layer by using the impedance probe, and evaluating the aging state of the waterproof layer and the corrosion state of the steel bridge deck by monitoring the impedance value of the waterproof layer and the corrosion rate of the resistance probe.
The utility model provides a suspension bridge steel bridge deck corrosion monitoring system buries impedance probe and resistance probe underground in the layer of mating formation, through measuring resistance probe's corrosion rate, utilize the impedance probe to measure the impedance value of layer of mating formation simultaneously (the impedance value of layer of mating formation can calculate the interface capacitance of layer of mating formation, interface capacitance isoparametric between layer of mating formation and the impedance probe, and the interface capacitance of layer of mating formation, interface capacitance isoparametric between layer of mating formation and the impedance probe and the moisture content of layer of mating formation, index linear correlation such as crackle density, through monitoring the impedance value of layer of mating formation and the corrosion rate of resistance probe come aassessment the ageing state of layer of mating formation and the corrosion state of steel bridge deck, thereby realize the monitoring to the ageing state of layer of mating formation and the corrosion state of steel bridge deck, greatly reduce dig the frequency and the amount of labour of layer verification steel bridge deck corrosion state of mating formation, meanwhile, the purpose of improving the traffic passing rate of the suspension bridge is achieved.
Drawings
Fig. 1 is the embodiment of the utility model provides an embodiment suspension bridge steel bridge face corrosion monitoring system's schematic structure view.
Fig. 2 is a schematic cross-sectional view taken along a-a of fig. 1.
Fig. 3 is an equivalent circuit diagram between the impedance probe and the waterproof layer at the initial stage of the waterproof layer aging according to the embodiment of the present invention.
Fig. 4 is the equivalent circuit diagram between the impedance probe and the waterproof layer in the later stage of the waterproof layer aging in the embodiment of the present invention.
FIG. 5 is a graph showing the trend of the etch margin and the etch rate of the resistance probe of example one.
FIG. 6 is a graph showing the variation trend of the etching margin and the etching rate of the resistance probe in the second example.
FIG. 7 is a graph showing the trend of the corrosion margin and the corrosion rate of the resistance probe in example three.
Fig. 8 is a schematic cross-sectional view of a system for monitoring corrosion of a steel bridge deck of a suspension bridge according to another embodiment of the present invention.
Fig. 9 is a schematic cross-sectional view of a corrosion monitoring system for a steel bridge deck of a suspension bridge according to another embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
As shown in fig. 1 and fig. 2, the embodiment of the utility model provides a suspension bridge steel bridge floor corrosion monitoring system for monitoring suspension bridge steel bridge floor structure 1's corrosion state, suspension bridge steel bridge floor structure 1 includes steel bridge floor 11 and is located the layer of mating formation 12 on steel bridge floor 11. Suspension cable bridge steel bridge face corrosion monitoring system includes impedance monitoring devices 2 and 3, and impedance monitoring devices 2 includes impedance analysis appearance 21 and impedance probe 22, and impedance analysis appearance 21 and impedance probe 22 electricity are connected, and resistance monitoring devices 3 includes corrosion probe host computer 31 and resistance probe 32, and corrosion probe host computer 31 and resistance probe 32 electricity are connected, and impedance probe 22 and resistance probe 32 all bury underground in layer 12 of mating formation.
Specifically, in the present embodiment, the impedance probe 22 and the resistance probe 32 are both embedded in the pavement layer 12, by measuring the corrosion rate of the resistance probe 32, and simultaneously measuring the impedance value of the pavement layer 12 by using the impedance probe 22, the impedance value of the pavement layer 12 can be calculated to obtain parameters such as the interface capacitance of the pavement layer 12, the interface capacitance between the pavement layer 12 and the impedance probe 22 (the parameters such as the interface capacitance of the pavement layer 12, the interface capacitance between the pavement layer 12 and the impedance probe 22 are linearly related to the moisture content of the pavement layer 12, the crack density, and the like, which will be described in detail below), and by monitoring the impedance value of the pavement layer 12 and the corrosion rate of the resistance probe 32, the aging state of the pavement layer 12 and the corrosion state of the steel bridge deck 11 are evaluated, so as to monitor the aging state of the pavement layer 12 and the corrosion state of the steel bridge deck 11, and greatly reduce the amount of pavement and labor for verifying the corrosion state of the steel bridge deck 11 by planning the pavement layer 12, meanwhile, the purpose of improving the traffic passing rate of the suspension bridge is achieved.
Further, as shown in fig. 2, in the present embodiment, the pavement layer 12 includes at least one asphalt pavement layer 121 and at least one waterproof layer 122 (of course, in other embodiments, the pavement layer 12 may also include other structural layers, such as a buffer layer, etc.), and the waterproof layer 122 is located between the steel bridge deck 11 and the asphalt pavement layer 121. Preferably, the resistance probe 22 and the resistance probe 32 are embedded in the waterproof layer 122, and the resistance probe 22 and the resistance probe 32 are not in contact with the steel bridge deck 11 (the steel bridge deck 11 is a conductor made of steel, and if the resistance probe 22 and the resistance probe 32 are in contact with the steel bridge deck 11, the measured values thereof are inaccurate).
Specifically, since the waterproof layer 122 generally has a good viscosity, the impedance probe 22 and the resistance probe 32 are disposed in the waterproof layer 122, so that the waterproof layer 122 can tightly wrap the impedance probe 22 and the resistance probe 32, thereby making the measurement values of the impedance probe 22 and the resistance probe 32 more accurate, and facilitating the laying of the impedance probe 22 and the resistance probe 32 (since the asphalt pavement layer 121 is rolled by a vehicle for a long time, it is more easily damaged, not only is the impedance probe 22 and the resistance probe 32 easily damaged, but also the measurement data may be inaccurate); meanwhile, because the waterproof layer 122 is located at the lowest layer of the pavement layer 12, the aging state of the waterproof layer 122 can reflect the state of the whole pavement layer 12, and can reflect the debonding state between the waterproof layer 122 and the asphalt pavement layer 121; moreover, the waterproof layer 122 is disposed close to the steel bridge deck 11, the corrosion state of the resistance probe 32 is closer to the real corrosion state of the steel bridge deck 11, the aging process of the waterproof layer 122 can provide a basis for analyzing the corrosion process of the steel bridge deck 11, and meanwhile, a warning can be provided for the corrosion of the steel bridge deck 11 about to occur by monitoring the aging state of the waterproof layer 122 (when the waterproof layer 122 is aged or damaged seriously, it indicates that the damaged position of the pavement layer 12 is close to the steel bridge deck 11). Of course, in other embodiments, the impedance probe 22 and the resistance probe 32 may be disposed in other structural layers of the paving layer 12 according to actual needs.
As shown in fig. 8, in another embodiment, the number of the asphalt pavement layers 121 and the waterproof layers 122 is multiple, the multiple asphalt pavement layers 121 and the multiple waterproof layers 122 are alternately arranged in sequence, and the impedance probes 22 and the resistance probes 32 are embedded in the waterproof layer 122 at the bottommost layer.
As shown in fig. 9, in another embodiment, the number of the asphalt pavement layers 121 and the waterproof layers 122 is multiple, the multiple asphalt pavement layers 121 and the multiple waterproof layers 122 are alternately arranged in sequence, and each waterproof layer 122 is provided with the impedance probe 22 and the resistance probe 32. The positions of the impedance probe 22 and the resistance probe 32 may be determined according to actual requirements.
Further, as shown in fig. 1 and fig. 2, in the present embodiment, the resistance probes 22 and the resistance probes 32 are both filiform metal electrodes (in the present embodiment, the resistance probes 22 and the resistance probes 32 are both steel wires) made of the same material as the steel deck 11, so that the corrosion state of the resistance probes 32 can represent the corrosion state of the steel deck 11. The diameter of the resistance probe 22 and the diameter of the resistance probe 32 do not exceed the thickness of the waterproof layer 122, so that the resistance probe 22 and the resistance probe 32 can be wrapped in the waterproof layer 122.
Further, as shown in fig. 1 and fig. 2, in the present embodiment, the impedance probes 22 are in a strip structure, each two impedance probes 22 form a group, and the two impedance probes 22 are electrically connected to the impedance analyzer 21. The impedance value of the waterproof layer 122 is measured by applying alternating current to the two impedance probes 22, so that parameters such as the interface capacitance of the waterproof layer 122 and the interface capacitance between the waterproof layer 122 and the impedance probes 22 are obtained.
Specifically, the impedance of the waterproof layer 122 may reflect the aging state of the pavement layer 12, and when moisture permeates into the waterproof layer 122 or the waterproof layer 122 cracks due to external force, the dielectric constant of the waterproof layer 122 may also increase. By measuring the impedance value of the waterproof layer 122, the interface capacitance of the waterproof layer 122 and the interface capacitance between the waterproof layer 122 and the impedance probe 22 can be calculated by the imaginary part of the impedance value (the impedance is a complex number, the real part is a resistance, the imaginary part is a reactance, and the reactance includes a capacitive reactance and an inductive reactance) (the interface capacitance of the waterproof layer 122 is obtained by high-frequency impedance, and the interface capacitance between the waterproof layer 122 and the impedance probe 22 is obtained by low-frequency impedance), the interface resistance between the waterproof layer 122 and the impedance probe 22 and the charge transfer resistance corresponding to corrosion of the impedance probe 22 can be calculated by the real part of the impedance value (the interface resistance between the waterproof layer 122 and the impedance probe 22 is obtained by high-frequency impedance, and the charge transfer resistance corresponding to corrosion of the impedance probe 22 is obtained by low-frequency impedance), and the capacitance value and the resistance value are linearly related to the water content or the crack density of the waterproof layer 122, the aging state of the pavement 12 can be evaluated by the capacitance and the resistance.
The specific method and theoretical basis for evaluating the aging state of the pavement layer 12 by using the impedance value measured by the impedance probe 22 are as follows:
1. FIG. 3 is an equivalent circuit diagram of the impedance probe 22 and the waterproof layer 122 at the early stage of aging of the waterproof layer 122, as shown in FIG. 3, where R is S Dielectric resistance of the water repellent layer 122, C C Is the interface capacitance of the waterproof layer 122, R C Is the interfacial resistance between the water repellant layer 122 and the impedance probe 22. At the initial stage of aging of waterproof layer 122, impedance probe 22 is not corroded (or the corrosion is slight, and impedance probe 22 is wrapped in waterproof layer 122 to keep an initial bright state), and at this time, interface capacitance C of waterproof layer 122 can be calculated by high-frequency impedance measured by impedance probe 22 (i.e. high-frequency alternating current is applied to impedance probe 22) C And the interfacial resistance R between the water repellent layer 122 and the impedance probe 22 C ；
At the initial stage of aging of the waterproof layer 122, the interface capacitance C of the waterproof layer 122 C ＝εε 0 A/d, where ε is the relative dielectric constant of the water repellent layer 122 0 Is a vacuum dielectric constant, A is a resistanceThe contact area between the anti-probe 22 and the waterproof layer 122, d is the diameter of the impedance probe 22, and ε 0 A and d remain unchanged (substantially no corrosion of the impedance probe 22 occurs), so the interfacial capacitance C of the water barrier 122 is maintained C Can reflect the change in the dielectric constant epsilon of the waterproof layer 122. Meanwhile, the interface resistance R between the waterproof layer 122 and the impedance probe 22 C ＝ρd/A d Where ρ is the pore resistivity of the waterproof layer 122, d is the diameter of the impedance probe 22, A d D and A are the peeling area of the waterproof layer 122 d Remains unchanged, so the interfacial resistance R between the waterproof layer 122 and the impedance probe 22 C Can reflect a change in the pore resistivity of the water repellent layer 122 (i.e., reflects a change in the porosity of the water repellent layer 122). Therefore, in the initial stage of aging of the waterproof layer 122, the interface capacitance C of the waterproof layer 122 is monitored C And the interfacial resistance R between the water repellent layer 122 and the impedance probe 22 C The aging state of the waterproof layer 122 can be evaluated, and the purpose of evaluating the aging state of the pavement layer 12 is achieved.
2. As shown in fig. 4, fig. 4 is an equivalent circuit diagram between impedance probe 22 and waterproof layer 122 at the later stage of aging of waterproof layer 122 (after waterproof layer 122 has aged and cracked), where R is S A dielectric resistance of the waterproof layer 122, C C Is the interface capacitance of the waterproof layer 122, R C Is the interfacial resistance between the water barrier 122 and the impedance probe 22, C dl Is the interfacial capacitance, R, between the waterproof layer 122 and the impedance probe 22 ct Corrosion occurs to the impedance probe 22 with a corresponding charge transfer resistance. After waterproof layer 122 ages, impedance probe 22 has corroded, and interface capacitance C between waterproof layer 122 and impedance probe 22 can be calculated by using low-frequency impedance measured by impedance probe 22 (i.e. impedance probe 22 is supplied with low-frequency alternating current) at this time dl And a charge transfer resistance R corresponding to corrosion of the impedance probe 22 ct (the change in the state of the impedance probe 22 due to corrosion of the impedance probe 22 no longer maintains the initial light state, at which time C dl And R ct Compare to C C And R C More accurately reflect the aging state of the waterproof layer 122), thereby evaluating the aging state of the waterproof layer 122 and further evaluating the pavement layer 12The purpose of the aging state.
Namely: in the initial stage of the aging of the waterproof layer 122, the interface capacitance C of the waterproof layer 122 can be monitored C And the interfacial resistance R between the water repellent layer 122 and the impedance probe 22 C To evaluate the aging state of the waterproof layer 122; at the later stage of the aging of the waterproof layer 122, the interface capacitance C between the waterproof layer 122 and the impedance probe 22 can be monitored dl And the resistance probe 22 is corroded ct To evaluate the aging state of the waterproof layer 122.
Further, as shown in fig. 1, in the present embodiment, the resistance probe 32 is bent to form a U-shaped structure, and both ends of the resistance probe 32 at the U-shaped opening are electrically connected to the corrosion probe host 31 through a cable.
Further, as shown in fig. 1, in the present embodiment, the resistance probe 32 includes a reference resistance probe 321 and a sensing resistance probe 322 (the reference resistance probe 321 is not corroded, and the sensing resistance probe 322 is corroded), that is, one reference resistance probe 321 and one sensing resistance probe 322 are a set, the reference resistance probe 321 and the sensing resistance probe 322 are both electrically connected to the corrosion probe host 31, and the reference resistance probe 321 and the sensing resistance probe 322 are both embedded in the pavement layer 12. The reference resistance probe 321 and the sensing resistance probe 322 have the same size (including length, diameter, and other parameters) and material, and the outer surface of the reference resistance probe 321 is wrapped with an insulating sealing material 3210, so that the reference resistance probe 321 is not corroded, and the reference resistance probe 321 and the sensing resistance probe 322 are in the same temperature region. The insulating sealing material 3210 includes, but is not limited to, heat shrink sleeve, sintered epoxy powder coating, PVDF coating, and the like.
Specifically, when the waterproof layer 122 on the surface of the steel plate is aged and cracked, the roadbed steel plate (steel bridge deck 11) is also corroded, and the adhesion between the asphalt pavement layer 121 and the steel plate is further reduced. In order to monitor the corrosion of the steel plate, the present embodiment uses a precision resistance probe technology to calculate and measure the corrosion rate of the sensing resistance probe 322, the corrosion rate of the sensing resistance probe 322 can reflect the corrosion rate of the steel bridge deck 11 at a position near the sensing resistance probe, and the corrosion depth of the steel bridge deck 11 can be calculated according to the corrosion rate of the sensing resistance probe 322. Meanwhile, the aging damage state of the waterproof layer 122 can be further evaluated according to the corrosion rate of the sensing resistor probe 322 (i.e. the corrosion rate of the resistor probe 32 and the resistance value of the pavement 12 measured by the resistance probe 22 are mutually verified).
Specifically, in the present embodiment, the etching probe unit 31 is a main body including a measurement circuit including a programmable constant current source, a programmable preamplifier, and an a/D converter. The resistance monitoring device 3 employs a typical four-wire system measurement method to improve the accuracy of measuring the resistance. When the corrosion-resistant probe is used, the reference resistance probe 321 and the sensing resistance probe 322 are connected in series, the central control unit MCU applies a constant and high-precision current I to the reference resistance probe 321 and the sensing resistance probe 322 through the constant current source, measures the voltage division at the two ends of the reference resistance probe 321 and the sensing resistance probe 322 and calculates the ratio λ of the voltage division, and calculates the corrosion rate of the sensing resistance probe 322 at any time according to the derivative of the time variation curve of λ. Meanwhile, by continuously monitoring and calculating the integral value of the corrosion rate of the sensing resistor probe 322 with time, the corrosion depth of the steel deck 11 can be further calculated.
Further, as shown in fig. 1, in the present embodiment, the reference resistance probe 321 and the sensing resistance probe 322 are arranged in a fan shape in the pavement layer 12 (i.e. the U-shaped open end of the reference resistance probe 321 and the U-shaped open end of the sensing resistance probe 322 are close to each other, and the other ends of the reference resistance probe 321 and the sensing resistance probe 322 are far away from each other, so as to form a fan-shaped structure), so that each group of resistance probes 32 can detect the corrosion rate of the steel bridge deck 11 of one sector, thereby increasing the monitoring area. Meanwhile, the corrosion rate of the steel bridge surface 11 at different positions can be detected by installing a plurality of groups of resistance probes 32.
Further, as shown in fig. 1 and 2, in the present embodiment, the diameter of the impedance probe 22 and the diameter of the resistance probe 32 are both 0.5 to 4 mm, and the length of the impedance probe 22 and the length L of the resistance probe 32 (the length L of the resistance probe 32 refers to a distance between an end close to the corrosion probe main unit 31 and an end far from the corrosion probe main unit 31) are both 0.5 to 10 m. The length of the impedance probe 22 and the length L of the resistance probe 32 are adapted to the monitoring range of the pavement layer 12, and the longer the length of the impedance probe 22 and the length L of the resistance probe 32 are, the larger the monitoring range is; however, when the buildup layer 12 is partially broken, the longer the length of the resistance probe 22 and the length L of the resistance probe 32, the lower the measurement accuracy.
Further, as shown in fig. 1, in the embodiment, the system for monitoring corrosion of the steel deck of the suspension bridge further includes a wireless transceiver 4, the wireless transceiver 4 is electrically connected to the impedance analyzer 21 and the corrosion probe host 31, and the aging parameter of the pavement layer 12 and the corrosion parameter of the steel deck 11 can be remotely transmitted by the wireless transceiver 4.
The embodiment of the utility model provides a still provide a suspension bridge steel bridge floor corrosion monitoring method, apply to above suspension bridge steel bridge floor corrosion monitoring system, this suspension bridge steel bridge floor corrosion monitoring method includes:
the impedance probe 22 and the resistance probe 32 are embedded in the pavement layer 12, the corrosion rate of the resistance probe 32 is measured, the impedance value of the pavement layer 12 is measured by using the impedance probe 22, and the aging state of the pavement layer 12 and the corrosion state of the steel bridge deck 11 are evaluated by monitoring the impedance value of the pavement layer 12 and the corrosion rate of the resistance probe 32.
Further, the pavement layer 12 includes at least one asphalt pavement layer 121 and at least one waterproof layer 122, the waterproof layer 122 is located between the steel bridge deck 11 and the asphalt pavement layer 121, and the method for monitoring corrosion of a steel bridge deck of the suspension bridge further includes:
the impedance probe 22 and the resistance probe 32 are buried in the waterproof layer 122, the corrosion rate of the resistance probe 32 is measured, meanwhile, the impedance value of the waterproof layer 122 is measured by the impedance probe 22, and the aging state of the waterproof layer 122 and the corrosion state of the steel bridge deck 11 are evaluated by monitoring the impedance value of the waterproof layer 122 and the corrosion rate of the resistance probe 32.
The embodiment of the utility model provides a suspension bridge steel bridge deck corrosion monitoring system and method, all bury impedance probe 22 and resistance probe 32 underground in layer 12 of mating formation, corrosion rate through measuring resistance probe 32, utilize impedance probe 22 to measure the impedance value of layer 12 of mating formation simultaneously, through the impedance value of monitoring layer 12 of mating formation and resistance probe 32's corrosion rate come the ageing state of aassessment layer 12 of mating formation and steel bridge deck 11's corrosion state, thereby realize the monitoring to the ageing state of layer 12 of mating formation and steel bridge deck 11's corrosion state, greatly reduced digs the frequency and the amount of labour of layer 12 of mating formation verification steel bridge deck 11's corrosion state of mating formation, can effectively manage layer 12 maintenance of mating formation, play the purpose that improves suspension bridge driving through rate simultaneously.
Example one:
the impedance probe 22, the reference resistance probe 321 and the sensing resistance probe 322 are all made of steel wires made of the same material as the steel bridge deck 11, the diameters of the three are 2 mm, the lengths of the three are 2 m, and the three are all laid in the waterproof layer 122. The reference resistance probe 321 and the sensing resistance probe 322 are both U-shaped structures, and the surface of the reference resistance probe 321 is coated with a polyethylene heat shrinkable sleeve.
In the case where the pavement layer 12 is intact and strong and has no microcracks, the monitoring probe is buried in the waterproof layer 122 for half a year.
As shown in the graph of the corrosion margin and the corrosion rate variation trend of the resistive probe 32 shown in fig. 5, from the online monitoring data of more than half a year, the corrosion rate of the resistive probe 32 at this position is kept at 0.001 μm/a, which can be ignored, indicating that the protection effect of the waterproof layer 122 is excellent. Meanwhile, the corresponding impedance test results are as follows: interfacial resistance R between the water barrier 122 and the impedance probe 22 C Greater than 10 7 Ω-cm 2 Interface capacitance C of the waterproof layer 122 C Less than 1 muF/cm 2 It indicates that the impedance probe 22 is not corroded, the impedance probe 22 is wrapped in the waterproof layer 122 to keep an initial bright state, and the interface capacitance is small.
Example two:
the impedance probe 22, the reference resistance probe 321 and the sensing resistance probe 322 are all made of steel wires made of the same material as the steel bridge deck 11, the diameters of the three are 2 mm, the lengths of the three are 2 m, and the three are all laid in the waterproof layer 122. The reference resistance probe 321 and the sensing resistance probe 322 are both U-shaped structures, and the surface of the reference resistance probe 321 is coated with a polyethylene heat shrinkable sleeve.
The pavement layer 12 is artificially provided with micro cracks visible to the naked eye through local high-frequency vibration, 3.5 percent of sodium chloride saline water is regularly sprayed, and the monitoring probe is buried in the waterproof layer 122 for half a year.
As shown in the corrosion allowance and corrosion rate variation trend chart of the resistance probe 32 shown in FIG. 6, from the online monitoring data of more than half a year, the instantaneous corrosion rate of the resistance probe 32 is substantially between 0.1 and 70 μm/a, the correlation between the peak value of the corrosion rate and the artificially sprayed salt water is good, the annual average corrosion rate is only 3.858 μm/a, which is substantially equivalent to 1/3 of the corrosion rate of a steel wire exposed in the atmosphere, and the total corrosion amount in the half year is 3 μm. Data analysis shows that the corrosion rate is slightly higher here, and the pavement layer 12 has a short time corrosion rate increase due to water penetration caused by micro-cracks.
Meanwhile, the corresponding impedance test results are as follows: resistance probe 22 corrosion corresponds to charge transfer resistance R ct About 10 3 Ω-cm 2 Level of (C), interface capacitance C between waterproof layer 122 and impedance probe 22 dl At 100. mu.F/cm 2 This indicates that the corrosion of the impedance probe 22 starts, the surface of the impedance probe 22 becomes rough, and the interface capacitance increases.
Example three:
the impedance probe 22, the reference resistance probe 321 and the sensing resistance probe 322 are all made of steel wires made of the same material as the steel bridge deck 11, the diameters of the three are 2 mm, the lengths of the three are 2 m, and the three are all laid in the waterproof layer 122. The reference resistance probe 321 and the sensing resistance probe 322 are both U-shaped structures, and the surface of the reference resistance probe 321 is coated with a polyethylene heat shrink sleeve.
Cracks are artificially produced on the pavement layer 12 through local high-frequency vibration, the width of the cracks on the upper surface of the pavement layer 12 reaches 0.5-1 mm, the length of the cracks is more than 30 cm, 3.5% of sodium chloride saline is regularly sprayed, and the monitoring probe is buried in the waterproof layer 122 for half a year.
Referring to the trend graph of the corrosion margin and the corrosion rate of the resistance probe 32 shown in fig. 7, from the online monitoring data over half a year, the initial corrosion rate of the resistance probe 32 is close to 90 μm/a, the average corrosion rate per year is 5.656 μm/a, and the total corrosion amount gradually increases to about 4 μm. Data analysis shows that the corrosion rate is higher than that of example two, and the aging of the waterproof layer 122 and the asphalt pavement 121 is accelerated due to larger cracks of the pavement 12.
Meanwhile, the corresponding impedance test results are: resistance probe 22 corrosion corresponds to charge transfer resistance R ct By an order of magnitude, generally less than 10 3 Ω-cm 2 The level of water barrier 122 and the interface capacitance C between the impedance probe 22 dl At 500. mu.F/cm 2 This indicates that the impedance probe 22 is corroded, the surface of the impedance probe 22 becomes rough, and the interface capacitance is large. Even if the crack is closed later by the adhesive, the resistance probe 22 is corroded corresponding to the charge transfer resistance R ct Slightly increased, but interface capacitance C between the water barrier 122 and the impedance probe 22 dl Still at 500. mu.F/cm 2 The above description is not reduced, and it is indicated that the surface of the impedance probe 22 is rough after being corroded and cannot be reversed.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A suspension bridge steel bridge deck corrosion monitoring system is used for monitoring the corrosion state of a suspension bridge steel bridge deck structure (1), the suspension cable bridge steel bridge deck structure (1) comprises a steel bridge deck (11) and a pavement layer (12) positioned on the steel bridge deck (11), it is characterized in that the suspension bridge steel bridge deck corrosion monitoring system comprises an impedance monitoring device (2) and a resistance monitoring device (3), the impedance monitoring device (2) comprises an impedance analyzer (21) and an impedance probe (22), the impedance analyzer (21) is electrically connected with the impedance probe (22), the resistance monitoring device (3) comprises a corrosion probe main machine (31) and a resistance probe (32), the corrosion probe main body (31) is electrically connected with the resistance probe (32), the impedance probe (22) and the resistance probe (32) are embedded in the paving layer (12).
2. The system according to claim 1, characterized in that said pavement (12) comprises at least one bituminous pavement (121) and at least one waterproof layer (122), said waterproof layer (122) being located between said steel deck (11) and said bituminous pavement (121), said impedance probes (22) and said resistance probes (32) being embedded in said waterproof layer (122).
3. The system for monitoring corrosion of the steel deck of the suspension bridge according to claim 2, wherein the number of the asphalt pavement (121) and the waterproof layer (122) is multiple, the multiple asphalt pavement (121) and the multiple waterproof layers (122) are sequentially and alternately arranged, and the impedance probe (22) and the resistance probe (32) are embedded in the waterproof layer (122) at the bottommost layer.
4. The system for monitoring corrosion of the steel deck of the suspension bridge according to claim 2, wherein the number of the asphalt pavement (121) and the waterproof layer (122) is multiple, the multiple asphalt pavement (121) and the multiple waterproof layers (122) are sequentially and alternately arranged, and the impedance probe (22) and the resistance probe (32) are arranged in each waterproof layer (122).
5. The suspension bridge steel deck corrosion monitoring system of claim 2, wherein said impedance probes (22) and said resistance probes (32) are both wire-like metal electrodes of the same material as said steel deck (11), and the diameter of said impedance probes (22) and the diameter of said resistance probes (32) do not exceed the thickness of said waterproof layer (122).
6. The system for monitoring corrosion of a steel bridge deck of a suspension bridge according to claim 5, wherein the diameter of said impedance probe (22) and the diameter of said resistance probe (32) are both 0.5 to 4 mm, and the length of said impedance probe (22) and the length of said resistance probe (32) are both 0.5 to 10 m.
7. The suspension bridge steel deck corrosion monitoring system of claim 1, wherein said resistance probe (32) comprises a reference resistance probe (321) and a sense resistance probe (322), said reference resistance probe (321) and said sense resistance probe (322) are both electrically connected to said corrosion probe host (31), and said reference resistance probe (321) and said sense resistance probe (322) are both embedded in said pavement layer (12).
8. The system for monitoring corrosion of steel bridge deck of suspension bridge according to claim 7, wherein said reference resistance probe (321) and said sensing resistance probe (322) are the same in size and material, and an insulating sealing material (3210) is wrapped on the outer surface of said reference resistance probe (321).
9. The suspension bridge steel deck corrosion monitoring system of claim 7, wherein said reference resistance probe (321) and said sense resistance probe (322) are arranged in a fan shape within said pavement (12).
10. The suspension bridge steel deck corrosion monitoring system according to any of claims 1-9, further comprising a wireless transceiver (4), said wireless transceiver (4) being in electrical signal connection with both said impedance analyzer (21) and said corrosion probe host (31).
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| CN202220630913.1U CN217060037U (en) | 2022-03-22 | 2022-03-22 | Suspension bridge steel bridge deck corrosion monitoring system |
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| CN202220630913.1U CN217060037U (en) | 2022-03-22 | 2022-03-22 | Suspension bridge steel bridge deck corrosion monitoring system |
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