CN112815862A - Steel bridge deck pavement interlayer bonding state monitoring system and void detection method - Google Patents
Steel bridge deck pavement interlayer bonding state monitoring system and void detection method Download PDFInfo
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- CN112815862A CN112815862A CN202011639289.3A CN202011639289A CN112815862A CN 112815862 A CN112815862 A CN 112815862A CN 202011639289 A CN202011639289 A CN 202011639289A CN 112815862 A CN112815862 A CN 112815862A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 239000011229 interlayer Substances 0.000 title claims abstract description 57
- 239000011800 void material Substances 0.000 title claims abstract description 36
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 title claims description 6
- 239000010410 layer Substances 0.000 claims abstract description 36
- 239000013307 optical fiber Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 18
- 239000000945 filler Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- SNMVRZFUUCLYTO-UHFFFAOYSA-N n-propyl chloride Chemical compound CCCCl SNMVRZFUUCLYTO-UHFFFAOYSA-N 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920000768 polyamine Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 239000012745 toughening agent Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000013508 migration Methods 0.000 claims description 2
- 230000005012 migration Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000007774 longterm Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000013011 mating Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
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- 238000005336 cracking Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
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- Physics & Mathematics (AREA)
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the technical field of orthotropic steel bridge deck pavement, in particular to a system for monitoring bonding state between pavement layers of a steel bridge deck and a method for detecting void, which comprises the following steps: the interlayer sensor is arranged in the waterproof bonding layer and fixed at the upper end of the steel bridge deck, an optical fiber is arranged in the interlayer sensor, and a three-section type grating is arranged in the interlayer sensor; the demodulator is fixedly arranged on the steel curb side, the demodulator and the interlayer sensor transmit signals through optical fibers, the demodulator monitors the grating wavelength deviation, and the interlayer void size is calculated. According to the invention, the optical fiber is arranged in the interlayer sensor, the optical fiber is provided with the three-section type grating, the interface deformation of the steel bridge deck and the pavement structure is different under the action of vehicle load, the wavelength shift of the grating in the interlayer sensor is caused, the interlayer void size is calculated by monitoring the wavelength shift, so that the long-term tracking observation of the bonding state between the pavement of the steel bridge deck 2 is realized, and the effective management and maintenance are achieved.
Description
Technical Field
The invention relates to the technical field of orthotropic steel bridge deck pavement, in particular to a system for monitoring bonding state between pavement layers of a steel bridge deck and a void detection method.
Background
With the wide application of the large-span steel bridge technology, the pavement of the steel bridge deck becomes one of the key technologies for the construction of the steel bridge. With the rapid development of traffic in China, the traffic flow is increasing day by day, particularly the passing ratio of trucks is increasing continuously, and under the action of high load stress amplitude and high cycle circulation of vehicles, the orthotropic plates cause fatigue damage and cracking of a steel bridge deck pavement structure and gradually cause the risk of void between layers of the steel bridge deck pavement structure. When bonding failure between the steel bridge deck pavement layers occurs, rainwater easily permeates into the corroded steel bridge deck, the service life and the durability of the whole bridge structure are shortened, and meanwhile, the pavement layers are separated to influence the driving comfort and the safety.
The interlayer bonding state of the orthotropic steel bridge deck pavement structure is closely related to the long-term service performance of the steel bridge deck and the pavement structure. To steel bridge deck pavement structure layer void monitoring, generally take evaluation means such as artifical sampling test, it is inefficient and the evaluation face is limited, have the potential safety hazard to steel bridge deck during the core drilling sample simultaneously, owing to the structure of mating formation has certain thickness, utilize multi-functional infrared detection car can not effectively detect the steel bridge deck pavement layer void condition. With the increasing of large-span steel box girder bridges, an accurate and effective detection technology is urgently needed to realize real-time tracking observation of pavement of the steel bridge deck and achieve the purpose of effective management and maintenance.
In view of the above problems, the designer is actively making research and innovation based on the practical experience and professional knowledge that the product engineering is applied for many years, and by matching with the application of the theory, so as to create a system for monitoring the bonding state between the steel bridge deck pavement layers and a method for detecting the void, and the system is more practical.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the technical scheme that: a steel bridge deck pavement interlayer bonding state monitoring system comprises:
the interlayer sensor is arranged in the waterproof bonding layer and fixed at the upper end of the steel bridge deck, an optical fiber is arranged in the interlayer sensor, and a three-section type grating is arranged in the interlayer sensor through the optical fiber;
the demodulator is fixedly arranged on the steel curb side, the demodulator and the interlayer sensor transmit signals through the optical fiber, the demodulator monitors the grating wavelength offset, and the interlayer void size is calculated.
Further, the interlayer sensor includes:
the sensor clamping piece comprises supporting parts at two ends and an upper supporting part in the middle, the sensor clamping piece is of a hollow structure, the supporting parts at two ends are fixed on the steel bridge deck, the optical fiber penetrates through the sensor clamping piece, and the supporting parts and the upper supporting part are respectively provided with three-section type gratings;
and the chemical filler is arranged in the sensor clamp and used for fixing and protecting the optical fiber.
Further, the optical fiber is rotated by an angle α of 330 ° to 360 ° between the support portion and the upper support portion.
Further, the chemical filler is a two-component epoxy resin, including: 60-80 parts of epoxy resin, 15-20 parts of polyamine curing agent, 4-10 parts of polyamide thermoplastic toughening agent, 2-6 parts of polyvinyl alcohol aqueous adhesive and 1-5 parts of chloropropane active diluent.
The invention also comprises a method for detecting the bonding state void between the paving layers of the steel bridge deck, which comprises the following steps:
the method comprises the following steps: detecting the initial wavelength and the current wavelength of the three sections of gratings, and calculating the offset;
step two: establishing a steel bridge deck deflection deformation curve differential equation under the action of vehicle dynamic load, and establishing a steel bridge deck deflection deformation curve function;
step three: respectively substituting the offset of the three-section grating into the deflection deformation curve function of the steel bridge panel to obtain corresponding deflection values w1、w2And w3；
Step four: by corresponding deflection value w1、w2And w3And calculating the interlayer void ratio rho.
Step five: judging the interlayer void ratio, and when rho is more than or equal to 100%, the interlayer is in a void state; when rho is less than or equal to 0 percent, the interlayer bonding state is good; when 0% < ρ < 100%, it indicates that there is ρ% void damage between the layers.
Further, in the second step, specifically: establishing a steel bridge deck deflection deformation curve differential equation under the action of vehicle dynamic load based on an Euler-Bernoulli beam theory:
in the formula, E is steel bridge deck plate rigidity modulus, I is unit cross section inertia, k is steel bridge deck plate elastic coefficient, x is the distance from the load center, w is steel bridge deck plate deflection deformation, F is load tensile stress, and the formula of calculating is as follows:
wherein K is the stress coefficient of the fiber grating, alpha is the angle of the fiber corner, RiAnd R0Current and initial wavelengths, Δ λ, of the fiber grating, respectivelyiF is the temperature compensation wavelength and the temperature compensation coefficient.
Further, when the differential equation of the deflection deformation curve of the steel bridge deck is solved, the solution is described as a parameter model related to A and B, and the expression of the deflection deformation curve w (x) of the steel bridge deck is shown as the following formula, wherein A is greater than 0, B is greater than 0, and x is greater than or equal to 0;
when the differential expression w' (x) of equation 3 is 0, the maximum value of the deflection deformation of the steel deck is
Further, in the third step, the wavelength offset of the three-section fiber bragg grating is respectively driven into the formula 3 to obtain the corresponding deflection deformation w1、w2And w3。
Further, the fourth step is specifically:
the invention has the beneficial effects that: according to the invention, the interlayer sensor and the demodulator are arranged, the optical fiber is arranged in the interlayer sensor, the optical fiber is provided with the three-section type grating, the interface deformation of the steel bridge deck and the pavement structure is different under the action of vehicle load, the wavelength shift of the grating in the interlayer sensor is caused, the monitoring is carried out through the wavelength shift, and the interlayer void size is calculated, so that the long-term tracking observation of the bonding state between the pavement layers of the steel bridge deck is realized, and the effective management and maintenance are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of an interlayer sensor according to the present invention;
fig. 3 is a top view of an interlayer sensor of the present invention.
Reference numerals: 1. a U-shaped stiffening rib; 2. a steel deck plate; 3. a waterproof adhesive layer; 4. paving a structural layer; 5. an interlayer sensor; 6. a steel curb; 7. an optical fiber transmission line; 8. a demodulator; 9. a sensor clip; 10. a chemical filler; 11. and (4) a grating.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1 to 3, a system for monitoring bonding state between steel bridge deck pavement layers comprises:
the interlayer sensor 5 is arranged in the waterproof bonding layer 3 and fixed at the upper end of the steel bridge deck 2, an optical fiber is arranged in the interlayer sensor 5, and a three-section type grating 11 is arranged in the interlayer sensor 5;
the demodulator 8 and the demodulator 8 are fixedly arranged on the side of the steel curb 6, the demodulator 8 and the interlayer sensor 5 transmit signals through optical fibers, and the demodulator 8 monitors the wavelength deviation of the grating 11 and calculates the interlayer void size.
Through setting up sensor 5 and demodulator 8 between the layer, be provided with optic fibre in the sensor 5 between the layer, optic fibre is provided with syllogic grating 11, and the vehicle load effect makes steel bridge deck 2 and the structural interface deformation difference that appears of mating formation, arouses the skew of 11 wavelength of grating in the sensor 5 between the layer, monitors through wavelength shift, calculates the size of coming to nothing between the layer to the realization is to steel bridge deck 2 long-term tracking observation of the bonding state between the layer of mating formation, reaches effective management maintenance.
The demodulator supplies power through a solar cell panel or a lithium battery, and transmits signal data to the processor terminal through a wired network or a wireless network, so that the real-time monitoring of the state between the steel bridge deck pavement layers is realized, and the running of vehicles on the steel bridge deck of the highway and the maintenance operation of workers are not influenced.
As a preference of the above embodiment, the interlayer sensor 5 includes:
and the sensor clamping piece 9 is fixed by laser welding, and the optical fiber is transmitted and connected with the demodulator 8 through a lead of a reserved hole on the steel curb. The sensor clamping piece 9 comprises two end supporting parts and a middle upper supporting part, the sensor clamping piece 9 is of a hollow structure, the two end supporting parts are fixed on the steel bridge deck 2, the optical fiber penetrates through the sensor clamping piece 9, and three-section type gratings 11 are respectively arranged on the supporting parts and the upper supporting part;
and the chemical filler 10 is arranged in the sensor clip 9 and used for fixing and protecting the optical fiber, wherein the chemical filler 10 is arranged in the sensor clip.
Through setting up sensor clamping piece 9, wherein sensor clamping piece 9 includes both ends supporting part and middle part upper support portion, and optic fibre passes sensor clamping piece 9, and is syllogic grating 11 respectively at supporting part and upper support portion to the realization is to the calculation of void size.
In the above embodiment, the optical fiber is preferably turned at an angle of 330 ° to 360 ° between the support portion and the upper support portion.
The optical fiber corner angle influences the calculation of the offset, the corner angle is set to be 330-360 degrees, the calculation result is more accurate, and the practicability and the accuracy of the method are improved.
As a preference of the above embodiment, the chemical filler 10 is a two-component epoxy resin including: 60-80 parts of epoxy resin, 15-20 parts of polyamine curing agent, 4-10 parts of polyamide thermoplastic toughening agent, 2-6 parts of polyvinyl alcohol aqueous adhesive and 1-5 parts of chloropropane active diluent.
The chemical filler is obtained by mixing and stirring for 1min and is injected into the sensor clamping piece through the needle tube, the chemical filler 10 fixes and protects the optical fiber, and the chemical filler 10 is set into double-component epoxy resin, so that moisture and air are effectively isolated, the optical fiber is protected, and the position of the optical fiber is fixed, and the accuracy of a measuring result is ensured.
The invention also comprises a method for detecting the bonding state void between the paving layers of the steel bridge deck, which comprises the following steps:
the method comprises the following steps: detecting the initial wavelength and the current wavelength of the three sections of gratings, and calculating the offset;
step two: establishing a steel bridge deck deflection deformation curve differential equation under the action of vehicle dynamic load, and establishing a steel bridge deck deflection deformation curve function;
step three: respectively substituting the offset of the three-section grating into the deflection deformation curve function of the steel bridge panel to obtain corresponding deflection values w1、w2And w3；
Step four: by corresponding deflection value w1、w2And w3And calculating the interlayer void ratio rho.
Step five: judging the interlayer void ratio, and when rho is more than or equal to 100%, the interlayer is in a void state; when rho is less than or equal to 0 percent, the interlayer bonding state is good; when 0% < ρ < 100%, it indicates that there is ρ% void damage between the layers.
Through setting up sensor and demodulator between the layer, be provided with optic fibre among the sensor between the layer, optic fibre is provided with the syllogic grating, and the vehicle load effect makes steel bridge panel and structure interface deformation appearance difference of mating formation, arouses the skew of grating wavelength among the sensor between the layer, monitors through the wavelength migration, calculates the size of coming to nothing between the layer to the realization is to steel bridge panel long-term tracking observation of bonding state between the layer of mating formation, reaches effective management maintenance.
As a preferable example of the above embodiment, in the second step, specifically: establishing a steel bridge deck deflection deformation curve differential equation under the action of vehicle dynamic load based on an Euler-Bernoulli beam theory:
in the formula, E is steel bridge deck plate rigidity modulus, I is unit cross section inertia, k is steel bridge deck plate elastic coefficient, x is the distance from the load center, w is steel bridge deck plate deflection deformation, F is load tensile stress, and the formula of calculating is as follows:
wherein K is the stress coefficient of the fiber grating, alpha is the angle of the fiber corner, RiAnd R0Current and initial wavelengths, Δ λ, of the fiber grating, respectivelyiFor temperature compensation of the wavelength f isA temperature compensation coefficient.
By establishing a differential equation of the deflection deformation curve of the steel bridge deck under the action of the dynamic load of the vehicle, the relationship between the angle of the corner of the optical fiber and the current and initial wavelengths of the optical fiber is established, so that the subsequent calculation is facilitated.
As a preference of the above embodiment, when solving the differential equation of the deflection deformation curve of the steel bridge deck, the solution is described as a parameter model about A and B, and the expression of the deflection deformation curve w (x) of the steel bridge deck is shown as the following formula, wherein A is more than 0, B is more than 0, and x is more than or equal to 0;
when the differential expression w' (x) of equation 3 is 0, the maximum value of the deflection deformation of the steel deck is
The deflection deformation of the steel bridge deck is conveniently calculated by describing the solution of a steel bridge deck deflection deformation curve differential equation as a parameter model about A and B.
Preferably, in the third step, the three-stage fiber grating wavelength shift amount is taken into formula 3 to obtain the corresponding deflection deformation amount w1、w2And w3Therefore, the obtained optical fiber wavelength offset is converted into the corresponding deflection deformation, and calculation is facilitated.
As a preference of the above embodiment, the step four specifically includes:
establishing an interlayer void ratio equation so as to obtain a corresponding deflection value w1、w2And w3Converting into a void ratio, wherein when rho is more than or equal to 100%, the interlayer is in a void state; when rho is less than or equal to 0 percent, the interlayer bonding state is good; when rho is more than 0% < 100%, it indicates that the interlayer has a void of rho%, so thatTherefore, the interlayer void ratio can be monitored in real time, and effective management and maintenance are facilitated.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a steel bridge deck pavement interlayer bonding state monitoring system which characterized in that includes:
the interlayer sensor (5) is arranged in the waterproof bonding layer (3) and fixed at the upper end of the steel bridge deck (2), an optical fiber is arranged in the interlayer sensor (5), and a three-section type grating (11) is arranged in the interlayer sensor (5) through the optical fiber;
the demodulator (8), demodulator (8) fixed setting is in steel curb (6) side, demodulator (8) with interlayer sensor (5) pass through the optic fibre transmission signal, demodulator (8) monitor grating (11) wavelength migration to calculate the interlayer size of taking off a space.
2. The system for monitoring the bonding state between the steel bridge deck pavement layers as claimed in claim 1, wherein the interlayer sensor (5) comprises:
the sensor clamping piece (9) comprises supporting parts at two ends and an upper supporting part in the middle, the sensor clamping piece (9) is of a hollow structure, the supporting parts at the two ends are fixed on the steel bridge deck (2), the optical fiber penetrates through the sensor clamping piece (9), and the supporting parts and the upper supporting part are respectively provided with three-section type gratings (11);
a chemical filler (10), the chemical filler (10) disposed within the sensor clip (9) to secure and protect the optical fiber.
3. The system for monitoring the interlayer bonding state of the steel bridge deck pavement according to claim 2, wherein the angle of rotation α of the optical fiber between the support part and the upper support part is 330 ° to 360 °.
4. The system for monitoring the bonding state between the steel bridge deck pavement layers according to claim 2, wherein the chemical filler (10) is a two-component epoxy resin comprising: 60-80 parts of epoxy resin, 15-20 parts of polyamine curing agent, 4-10 parts of polyamide thermoplastic toughening agent, 2-6 parts of polyvinyl alcohol aqueous adhesive and 1-5 parts of chloropropane active diluent.
5. A steel bridge deck pavement interlayer bonding state void detection method is characterized by comprising the following steps:
the method comprises the following steps: detecting the initial wavelength and the current wavelength of the three sections of gratings, and calculating the offset;
step two: establishing a steel bridge deck deflection deformation curve differential equation under the action of vehicle dynamic load, and establishing a steel bridge deck deflection deformation curve function;
step three: respectively substituting the offset of the three-section grating into the deflection deformation curve function of the steel bridge panel to obtain corresponding deflection values w1、w2And w3；
Step four: by corresponding deflection value w1、w2And w3And calculating the interlayer void ratio rho.
Step five: judging the interlayer void ratio, and when rho is more than or equal to 100%, the interlayer is in a void state; when rho is less than or equal to 0 percent, the interlayer bonding state is good; when 0% < ρ < 100%, it indicates that there is ρ% void damage between the layers.
6. The method for detecting the bonding state void between the steel bridge deck pavement layers according to claim 5, wherein in the second step, the method specifically comprises the following steps: establishing a steel bridge deck deflection deformation curve differential equation under the action of vehicle dynamic load based on an Euler-Bernoulli beam theory:
in the formula, E is steel bridge deck plate rigidity modulus, I is unit cross section inertia, k is steel bridge deck plate elastic coefficient, x is the distance from the load center, w is steel bridge deck plate deflection deformation, F is load tensile stress, and the formula of calculating is as follows:
wherein K is the stress coefficient of the fiber grating, alpha is the angle of the fiber corner, RiAnd R0Current and initial wavelengths, Δ λ, of the fiber grating, respectivelyiF is the temperature compensation wavelength and the temperature compensation coefficient.
7. The method for detecting the bonding state between the paving layers of the steel bridge deck according to the claim 6, wherein in the third step, when a differential equation of a deflection deformation curve of the steel bridge deck is solved, the solution is described as a parameter model about A and B, and the deflection deformation curve w (x) expression of the steel bridge deck is shown as the following formula, wherein A is more than 0, B is more than 0, and x is more than or equal to 0;
when the differential expression w' (x) of equation 3 is 0, the maximum value of the deflection deformation of the steel deck is
Respectively driving the wavelength offset of the three-section fiber bragg grating into the formula 3 to obtain the corresponding deflection deformation w1、w2And w3。
8. The method for detecting the bonding state void between the steel bridge deck pavement layers according to claim 5, wherein the fourth step is specifically as follows:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114184503A (en) * | 2021-12-06 | 2022-03-15 | 山东高速建设管理集团有限公司 | Device and method for intelligently monitoring interlayer state of asphalt pavement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184503A (en) * | 2021-12-06 | 2022-03-15 | 山东高速建设管理集团有限公司 | Device and method for intelligently monitoring interlayer state of asphalt pavement |
| CN114184503B (en) * | 2021-12-06 | 2024-03-19 | 山东高速建设管理集团有限公司 | Device and method for intelligently monitoring interlayer state of asphalt pavement |
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