CN104457604B - Asphalt pavement site radial strain test sensor based on optical fiber sensing technology - Google Patents
Asphalt pavement site radial strain test sensor based on optical fiber sensing technology Download PDFInfo
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- CN104457604B CN104457604B CN201410578591.0A CN201410578591A CN104457604B CN 104457604 B CN104457604 B CN 104457604B CN 201410578591 A CN201410578591 A CN 201410578591A CN 104457604 B CN104457604 B CN 104457604B
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- sealing valve
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 239000013307 optical fiber Substances 0.000 title claims abstract description 35
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 239000010426 asphalt Substances 0.000 title abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 47
- 238000009413 insulation Methods 0.000 claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 4
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- 238000005266 casting Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 9
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 7
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Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses an asphalt pavement site radial strain test sensor based on the optical fiber sensing technology, and belongs to the technical field of road equipment. The asphalt pavement site radial strain test sensor is characterized in that the sensor is embedded before a tested pavement is laid; before the sensor is placed, a pouring sealant is poured into a pouring groove, and a pouring opening and a heat insulation layer are sealed; at the test place, an annular arrangement shape of armouring wires on the test segment is controlled; normal paving and rolling of a pavement structure are completed, and an optical grating is slowly tensioned and fixed temporarily; a control wire of a sealing valve system is pulled, and an optical fiber in the pouring groove is made to be separated from a separation sealing sleeve to be in direct contact with the pouring sealant; after the pouring sealant completely reaches rigidity, temporary fixing of optical fibers on a demodulation instrument is removed. The sensor has the advantages that the construction cost is low, use is simple, layout is convenient, normal construction of the pavement is not affected, and the influence on distribution of a strain field of the pavement structure is very small. The damage of large deformation generated in the forming process of an asphalt pavement structure to the sensor is avoided, and the high precision in the test process is kept.
Description
Technical field
The invention belongs to roadway experiment equipment technical field, be related to is a kind of asphalt road based on optical fiber sensing technology
Face scene radial strain test sensor.
Technical background
Road is the important component part of traffic infrastructure, the Jun Zhan of highway in China construction investment in recent years China GDP's
2%-3%.But from the point of view of worldwide, the early disease problem of road is never solved at all.On the other hand, road surface
The impact to road for the maintenance becomes increasingly difficult to stand, and easily causes pernicious vehicle accident.Therefore, with economical
Development, and the carrying heavy traffic demand to road, the serviceability improving road structure has become as the emphasis of road engineering
Goal in research.
For a long time, domestic and international Asphalt Mixture Design, all based on empirical method, bears height with people to road structure
The volume of traffic, heavy load and long-life requirement are continuously increased, and the assurance of road structure performance and its damage evolution law is more next
More it is taken seriously, the research work of domestic and international road engineering circle has increased application in road structure design for the mechanical analyses.Road
The basic solution of the early disease problem of line structure needs comprehensive to factors such as pavement material, structure, hydrogeology, load and environment
The accurate assurance that joint force scholarship and moral conduct is, and lack the crucial resistance that effective means of testing provides reference data to be this work
One of.
Dynamic moduluss, repeat to load and the proposition of the laboratory experiment method such as static creep indicates to asphalt pavement material
The beginning of fine mechanical analyses, but the asphalt pavement material for highly non-uniform, anisotropy, tension and compression dissimilarity, scene is surveyed
Examination more can reflect real response under environment-traffic loading coupling for the road structure.How by site road structural response
Associate with the precision measurement of laboratory road surface test specimen, similarly significant.
The sensor that the characteristic requirements of the severe Service Environment of road structure and asphalt are embedded in road structure needs
High temperature (up to 160 DEG C), moist working environment, high grinding pressure can be born, repeat heavy load etc., and have big coverage rate,
Therefore most traditional civil engineering sensors cannot be directly used in road structure.And existing based on optical fiber technology
Live pavement strain measuring technology is also only limitted to linear type measurement, by optical fiber sensing element and encapsulating material size limitation, senses
Device gauge length also is difficult to control and arrives very little.
Content of the invention
The purpose of the present invention is to be to provide a kind of test of the Bituminous Pavement radial strain based on optical fiber sensing technology
Sensor.
Technical scheme is as follows：
A kind of based on optical fiber sensing technology Bituminous Pavement radial strain test sensor, including bare optical fibers and bare optical gratings,
Armouring protective wire, controller for profile, embedding groove, single-ended fixed block, deformation buffer groove, thermal insulation layer and sealing valve system；Bare fibre
Grating is as deformation sensitive element.Sealing valve system includes control line, sealing gasket and every big envelope.
By bare optical fibers and bare optical gratings or plus the fiber grating of casing protection penetrate armoury wire as measurement part it is ensured that grating begins
Final position is in annular test region.One end lead-out wire of fiber grating is fixed in embedding groove by single-ended fixed block, fiber grating
The other end as signal transmission section be previously threaded through sealing valve system in embedding groove every jacket portion, then pass through deformation buffer groove
Preformed hole with embedding groove two ends.Before sensor is embedded, by sealing valve system, the sealing gasket low viscosity glue in embedding groove is fixed
Inside embedding groove, another sealing gasket outside embedding groove is close to embedding cell wall it is ensured that will be close for the preformed hole of embedding groove outer end
Envelope, casting glue does not flow out from the preformed hole of embedding groove.The control line that sealing valve system is located at outside embedding groove is protected by independent armouring
Pavement structure drawn by shield line or control line is caused through same armouring protective wire together with optical fiber transmission line and is connected demodulation instrument point.
Embedding groove top is provided with encapsulating mouth.Set, outside embedding groove and deformation buffer groove, the thermal insulation layer being made up of heat-barrier material.Thermal insulation layer can
To avoid high temperature during bituminous paving molding that the fast setting of casting glue is acted on.Controller for profile can be cylinder or annulus,
For controlling the circular arrangement shape of test section armoury wire when sensor is laid, sensor can remove after placing.
Single-ended fixed block adopts fiber-reinforced plastic (FRP, Fiber Reinforced Polymer), epoxide resin material
Or metal material is constituted；Casting glue is made up of low viscosity epoxy resin material；Sealing valve system control line is by tinsel or deformation
Little plastic cord is constituted；Sealing valve system is made up of flexible plastic or elastomeric material every big envelope；Sealing valve system sealing gasket is moulded by soft
Material or elastomeric material are constituted；Embedding groove adopts metal material or fiber-reinforced plastic to constitute；Controller for profile does not limit material.
This Bituminous Pavement radial strain test sensor is embedded before tested supercrust is laid.Sensor is adjusted before placing
Make casting glue and pour into embedding groove, seal embedding mouth and thermal insulation layer afterwards.Lay and utilize shape control in testing location during sensor
Device processed controls the ring disposition shape of test section armoury wire, connects light tension optical fiber sizing at (FBG) demodulator in sensor, afterwards
Remove controller for profile.Pre-spread part asphalt mixture is used for more preferable sizing on a sensor.Just complete pavement structure
Often after decking and rolling, Transmission Fibers are connected to grating demodulation instrument, observes (FBG) demodulator data and slowly draw span line light
Fibre, until stopping stretching when grating tightens beginning tension, and temporarily fixes in outside span line, keeps slightly pulling state.Draw
The control line of dynamic sealing valve system, makes the sealing gasket in embedding groove depart from the embedding groove sidewall of bonding until reaching opposite side wall,
The optical fiber in embedding groove is caused to depart from every big envelope and casting glue directly contact.It is fully achieved after rigidity Deng casting glue, remove
The temporary transient fixation of optical fiber at (FBG) demodulator.During test, sound can be carried out in sensor measurement ring center and carry loading, sensor is surveyed
The strain value of amount then can be converted into the radial strain value at measuring point.
The invention has the advantages that low cost, using simple, lay conveniently, do not affect road surface normal construction.Due to
Optical fiber diameter very little itself, sensor diameter therefore involved in the present invention can also do little, the then stress of road pavement structure itself
Field distribution affects very little.Present invention, avoiding the damage to sensor for the large deformation producing in asphalt pavement structure forming process,
Maintain high accuracy during test again.Sensor measurement radius involved in the present invention is adjustable, can load dot center's difference simultaneously
Continuously lay at radius, the linear type sensor that this is constrained to gauge length size is extremely difficult to.Sensor involved in the present invention
Annular design be more convenient for loading test result with asphalt indoor cylinder Colophonium test block compared with, due to annular perimeter
It is 3.14 times of diameter, therefore on the basis of same gauge length, the region that annular design can be tested is less, precision controllability is more
High.Sensor involved in the present invention can measure static strain it is also possible to survey dynamic strain, also sets as the test of live dynamic response
Standby experiment with Dynamic Modulus of Asphalt Mixture is matched it is also possible to coordinate road bend equipment to carry out road structure internal response survey
Amount.
Brief description
Accompanying drawing 1 is Bituminous Pavement radial strain test sensor and the sealing valve system master based on optical fiber sensing technology
Want modular construction schematic diagram.
Accompanying drawing 2 is sensor entirety layout diagram.
In figure：1 bare optical fibers and bare optical gratings；2 armouring protective wires；3 single-ended fixed blocks；4 control lines；5 every big envelope；6 embedding grooves；7 is close
Packing；8 deformation buffer grooves；9 thermal insulation layers；10 fiber Bragg grating (FBG) demodulators；11 controller for profile.
Specific embodiment
Describe the specific embodiment of the present invention with reference to technical scheme and accompanying drawing in detail.
As illustrated, mainly include bare optical fibers and bare optical gratings 1, armouring protective wire 2, single-ended fixed block 3, control line 4, every big envelope 5,
Embedding groove 6, sealing gasket 7, deformation buffer groove 8, thermal insulation layer 9；Fiber Bragg grating (FBG) demodulator 10；Controller for profile 11.
Fiber grating is penetrated the armoury wire as measurement part it is ensured that grating is always positioned at annular test section with sleeve pipe
Domain.One end of fiber grating is fixed in embedding groove by single-ended fixed block, and the other end is each passed through deformation as signal transmission section
Preformed hole in dashpot and embedding groove, and be previously threaded through sealing valve system in embedding groove every jacket portion.Sealing valve system
Be connected by control line with sealing gasket every big envelope.Front sealing gasket low viscosity in embedding groove for the sealing valve system buried by sensor
Glue is fixed on embedding groove side, and now embedding groove external seal pad is close to embedding cell wall it is ensured that casting glue is not from the optical fiber of embedding groove
Flow out in preformed hole.The control line that sealing valve system is located at outside embedding groove passes by independent armoury wire extraction pavement structure or with optical fiber
Defeated line causes connection demodulation instrument point through same armoury wire together.Embedding groove top is provided with encapsulating mouth.Embedding groove and deformation are slow
The thermal insulation layer being made up of heat-barrier material is set outside jet-bedding.
Radially dynamic static strain testing sensor is embedded before tested supercrust is laid for this Bituminous Pavement.Sensor buries
If when modulate casting glue and pour into embedding groove, seal embedding mouth and thermal insulation layer afterwards.Lay and utilize in testing location during sensor
Controller for profile controls the ring disposition shape of test section armoury wire, connects light tension optical fiber at (FBG) demodulator in sensor fixed
Type, removes controller for profile afterwards.Pre-spread part clears compound for preferably shaping on a sensor.Complete road surface knot
After the normal decking and rolling of structure, Transmission Fibers are connected to grating demodulation instrument, observe the slow tension of (FBG) demodulator data
Grating, until stopping stretching when grating tightens beginning tension, and temporarily fixes.Pull the control line of sealing valve system, make embedding
Sealing gasket in groove departs from the embedding groove sidewall of bonding until reaching opposite side wall, cause the optical fiber in embedding groove depart from every
Big envelope and casting glue directly contact.It is fully achieved after rigidity Deng casting glue, remove the simple fixation of optical fiber at (FBG) demodulator.Test
When, sound can be carried out in the corresponding center of sensor measurement ring and carry loading, the strain value of sensor measurement then can be converted into
Radial strain value at measuring point.
Wherein embedding groove and deformation buffer groove can be one, only separated or individual slots with side wall.Deformation buffer
Groove is sealing before and after laying, and embedding groove is provided with encapsulating opening before embedded.Deformation buffer groove and embedding groove just to outer wall in
Portion is provided with opening, and pore size is just to allow armoury wire to pass through, and armoury wire can free in and out it is ensured that road surface is rolled in Kong Chu
When test circle can expand with part of detecting, stretch into the armoury wire of deformation buffer groove length to ensure road surface roll finish after be still to
Armoury wire is had to stay inside deformation buffer groove.Reserved osculum, pore size in the middle part of the side wall that deformation buffer groove is separated with embedding groove
For only allowing optical fiber to pass through, in the hole wall can be stained with rubber layer, prevents the casting glue in embedding groove from flowing into deformation buffer groove.
This Bituminous Pavement radial strain test sensor measurement radius can change according to demand.Same testing location can
Lay multiple sensors along different depth, different radii with measuring strain field distribution situation.Radial strain can be tried to achieve according to following formula.
εr=ε/(2 π)
ε in formularRepresent radial strain at measuring point, ε represents the strain value that grating records.
Claims (5)
1. a kind of Bituminous Pavement radial strain test sensor based on optical fiber sensing technology, including bare optical fibers and bare optical gratings, armour
Dress protective wire, controller for profile, embedding groove, single-ended fixed block, deformation buffer groove, thermal insulation layer and sealing valve system；Bare fibre light
Grid are as deformation sensitive element；Sealing valve system includes control line, sealing gasket and every big envelope；It is characterized in that：By bare fibre
Grating or plus the fiber grating of casing protection penetrate the armoury wire as measurement part it is ensured that grating is always positioned at annular test section
Domain；One end lead-out wire of fiber grating is fixed in embedding groove by single-ended fixed block, and the other end of fiber grating passes as signal
Defeated section be previously threaded through sealing valve system in embedding groove every jacket portion, then pass through the pre- of deformation buffer groove and embedding groove two ends
Box out；Sealing valve system is fixed on inside embedding groove in the sealing gasket low viscosity glue in embedding groove before burying by sensor, position
Another sealing gasket outside embedding groove is close to embedding cell wall it is ensured that by the preformed hole sealing of embedding groove outer end, casting glue is not from filling
Flow out in the preformed hole of sealing groove；The control line that sealing valve system is located at outside embedding groove draws pavement structure by independent armouring protective wire
Or control line is caused through same armouring protective wire together with optical fiber transmission line and is connected demodulation instrument point；Embedding groove top is provided with filling
Jiao Kou；Set, outside embedding groove and deformation buffer groove, the thermal insulation layer being made up of heat-barrier material；Casting glue is poured into when burying by sensor
Embedding groove, seals embedding groove and thermal insulation layer afterwards；After completing the normal decking and rolling of pavement structure, tension grating simultaneously passes outside
Temporarily fix for defeated section；Pull the control line of sealing valve system, the optical fiber in embedding groove departs from every big envelope and casting glue directly contact；
After casting glue is fully achieved rigidity, remove the temporary transient fixation of optical fiber.
2. a kind of Bituminous Pavement radial strain test sensing based on optical fiber sensing technology according to claim 1
Device it is characterised in that：Lay the ring disposition shape controlling test section armouring protective wire during sensor by controller for profile, pass
Sensor measurement radius is adjustable, continuously lays sensor loading at dot center's different radii.
3. a kind of Bituminous Pavement radial strain test based on optical fiber sensing technology according to claim 1 and 2 passes
Sensor it is characterised in that：Deformation buffer groove lay before and after be sealing, with embedding groove just to outer wall in the middle part of be provided with opening, hole
Footpath size is just to allow armoury wire to pass through, and armouring protective wire frees in and out it is ensured that test circle can when road surface is rolled in Kong Chu
Expand with part of detecting, stretch into the armoury wire of deformation buffer groove length to ensure road surface roll finish after be still to armoury wire and stayed
Inside deformation buffer groove.
4. a kind of Bituminous Pavement radial strain test based on optical fiber sensing technology according to claim 1 and 2 passes
Sensor it is characterised in that：Single-ended fixed block adopts fiber-reinforced plastic, epoxide resin material or metal material to constitute；Casting glue
It is made up of low viscosity epoxy resin material；Sealing valve system control line is made up of the little plastic cord of tinsel or deformation；Sealing valve
System is made up of flexible plastic or elastomeric material every big envelope；Sealing valve system sealing gasket is made up of flexible plastic or elastomeric material；Embedding
Groove adopts metal material or fiber-reinforced plastic to constitute；Controller for profile is cylinder or annulus, does not limit material.
5. a kind of Bituminous Pavement radial strain test sensing based on optical fiber sensing technology according to claim 3
Device it is characterised in that：Single-ended fixed block adopts fiber-reinforced plastic, epoxide resin material or metal material to constitute；Casting glue by
Low viscosity epoxy resin material is constituted；Sealing valve system control line is made up of the little plastic cord of tinsel or deformation；Sealing valve system
System is made up of flexible plastic or elastomeric material every big envelope；Sealing valve system sealing gasket is made up of flexible plastic or elastomeric material；Embedding groove
Constituted using metal material or fiber-reinforced plastic；Controller for profile is cylinder or annulus, does not limit material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578591.0A CN104457604B (en) | 2014-10-24 | 2014-10-24 | Asphalt pavement site radial strain test sensor based on optical fiber sensing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578591.0A CN104457604B (en) | 2014-10-24 | 2014-10-24 | Asphalt pavement site radial strain test sensor based on optical fiber sensing technology |
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| CN104457604A CN104457604A (en) | 2015-03-25 |
| CN104457604B true CN104457604B (en) | 2017-02-22 |
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| CN108507486A (en) * | 2018-03-13 | 2018-09-07 | 广东工业大学 | A kind of detection method of pavement structure strain |
| CN110686613B (en) * | 2019-11-14 | 2024-05-17 | 大连理工大学 | Roadbed deformation monitoring system based on distributed optical fiber dynamic and static strain test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371002A (en) * | 2002-03-19 | 2002-09-25 | 李恩林 | Fiber grating packaging device |
| CN101769442A (en) * | 2010-01-18 | 2010-07-07 | 大连理工大学 | Method for monitoring pipeline corrosion |
| CN102636128A (en) * | 2012-03-30 | 2012-08-15 | 大连理工大学 | Strain hoop sensor used for measuring hoop strain of pipeline |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6785443B2 (en) * | 2001-02-05 | 2004-08-31 | Teraxion Inc. | Optical fiber Bragg grating tuning device |
| US7068869B1 (en) * | 2005-01-10 | 2006-06-27 | Francisco Manuel Moita Araujo | Passive athermal fiber bragg grating strain gage |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371002A (en) * | 2002-03-19 | 2002-09-25 | 李恩林 | Fiber grating packaging device |
| CN101769442A (en) * | 2010-01-18 | 2010-07-07 | 大连理工大学 | Method for monitoring pipeline corrosion |
| CN102636128A (en) * | 2012-03-30 | 2012-08-15 | 大连理工大学 | Strain hoop sensor used for measuring hoop strain of pipeline |
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