CN103323038A - Optical fiber bridge inhaul cable corrosion monitoring sensor - Google Patents
Optical fiber bridge inhaul cable corrosion monitoring sensor Download PDFInfo
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- CN103323038A CN103323038A CN2013102047830A CN201310204783A CN103323038A CN 103323038 A CN103323038 A CN 103323038A CN 2013102047830 A CN2013102047830 A CN 2013102047830A CN 201310204783 A CN201310204783 A CN 201310204783A CN 103323038 A CN103323038 A CN 103323038A
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Abstract
Provided is an optical fiber bridge inhaul cable corrosion monitoring sensor. An optical fiber sensing structure based on the optical fiber Brillouin sensing technology and an optical fiber sensing structure based on the optical fiber white light interferometry sensing technology are used for achieving corrosion quantitative monitoring. According to a corrosion monitoring method, single-module light-guide fibers which wind the outer surface of a steel wire bundle or a zinc-coated steel wire containing a mortar bedding layer are used as a sensing unit, and long-time stable monitoring on periphery corrosion expanding strain of the steel wire bundle or the single zinc-coated steel wire caused by corrosion can be achieved. The sensing structure of the optical fiber bridge inhaul cable corrosion monitoring sensing method comprises a zinc-coated steel wire corrosion expanding monitoring module, a steel wire bundle corrosion expanding monitoring module, a temperature compensation optical fiber raster, a signal transmission section optical cable and a protective steel sleeve. The sensor mainly carries out corrosion monitoring on two kinds of cable body parts. The first kind of cable body part is the single zinc-coated steel wire on end portion of an anchor head, and the second kind of cable body part is steel wire bundles in the middle of the anchor head and in a cable body. The sensor is suitable for long-time monitoring of inhaul cable corrosion, accuracy is high, and service life is long.
Description
Technical field
The invention belongs to civil engineering work bridge structure safe monitoring field, relate to a kind of fiber-optic monitoring sensor of bridge cable corrosion monitoring.
Background technology
Bridge cable is given tower (main arch) with the bridge deck Load Transfer, and the bridge deck load comprises dead load and the loads such as vehicle, wind and temperature of bridge floor deadweight, and drag-line will produce fatigue effect under the live load effect, cause Cumulative Fatigue Damage; In addition, because the drag-line bridge is hyperstatic structure, other deformation of members and damage also can cause the variation of bridge cable stress, testing result as Tang Guodong shows, design stressed essentially identical drag-line under arms after 8 years when becoming bridge, surplus the internal force of long draw differs 20 with the shortest drag-line internal force times, this just makes the military service security presence of drag-line sizable hidden danger.In addition, drag-line is exposed in the atmospheric environment, and the erosion of rainwater and contaminated air (comprising Vehicular exhaust) will cause the corrosion of drag-line stress.Analyze by present bridge testing result, corrosion is the form of the most general, the major injury of bridge cable.The position that bridge La Lasuo damage takes place comprises bridge cable cable body and anchor head, and general anchor head is more serious than the cable body damage of bridge cable, and following anchor head is more serious than last anchor head.
Bridge cable corrosion damage is relevant with the safeguard procedures of drag-line.The early stage drag-line bridge of building of China often adopts prestress or partial prestressing drag-line, and this class drag-line mainly is to avoid steel bar corrosion by concrete; Second class is to adopt the protection of stainless steel sleeve pipe, deposit concrete or mortar in the stainless steel sleeve pipe; The 3rd class is that the normal hot extrude PE that adopts overlaps in recent years.Early stage anchor head often adopts concrete to carry out sealing off and covering anchorage; The employing steel bushing is also arranged, then deposit concrete or adopt other encapsulant to carry out sealing off and covering anchorage.Cause the main cause of drag-line generation corrosion to have:
1) perfusion mortar and steel sleeve cause steel strand wires to contact with extraneous in conjunction with leakiness, and airborne moisture and acidic materials and steel strand wires generation chemical reaction cause the steel strand wires corrosion;
2) sealing off and covering anchorage concrete leakiness or cracking cause ponding to enter drag-line and infiltrate steel strand wires inside along the steel wire bundle gap and cause its corrosion, and the outer corrosion of middle silk is serious;
3) anchor head protection defective makes air, rainwater directly contact with ground tackle, backing plate etc. and produces corrosion, and extends corrosion to steel strand wires;
4) steel strand wires and sleeve friction injured surface oxide film accelerate its corrosion.
Increase along with active time, under the stress effect, the corrosion degree of drag-line will constantly be accumulated, and the loaded section of steel strand wires (parallel steel wire) will constantly weaken, under the opposite extreme situations, drag-line will rupture, as be built in 1969 to 1974 the not blue special bridges of Hamburg, Germany Ku Er, because the suspension cable corrosion is serious, at the 3rd year that builds up, just changed all suspension cables, expensive 6,000 ten thousand dollars, and the cost of changing rope is newly-built 3～4 times.
The method of bridge cable corrosion damage check has at present: 1) manual detection method: mainly be to check whether cable system suffers corrosion, whether each securing member is loosening, and whether cable body has inclination; Advantage is macroscopic examination qualitatively; Shortcoming is the check fee manpower and materials, and the limited and testing result of examination scope is that qualitative difficulty satisfies the evaluation requirement, can't realize in time detecting and monitoring to sudden accident.2) ultrasonic detection method: be mainly used to detect parallel steel wire or steel strand surface crackle, rust hole, but because the drag-line cable body is made up of many parallel steel wires or steel strand wires, cross sectional shape complexity, corrosion damage position are uncertain, ultrasound wave only can detect surface imperfection, in addition, anchor head is complex-shaped, and there is bigger blind area in ultrasound examination.3) radioactive ray detection method: can detect drag-line internal injury and defective, can obtain corrosion and fracture of wire and the stripped thread equivalent damage of drag-line cable body inside more exactly, but it is not high to detect the anchor head precision, and shortcoming is in order to shield the radiation to human body, and x-ray apparatus is often bigger.4) electrochemical detection method: Electrochemical Detection is primarily aimed at single steel bar or steel strand wires, its detection effect of drag-line to many parallel steel wires or steel strand wires composition is not good enough, especially present assessment method is the corrosion situation that qualitatively judges drag-line according to the scope of potential difference (PD) basically, has no idea to carry out quantitatively and real-time testing.Thereby the development high precision, lay bridge cable corrosion monitoring sensor convenient, monitoring in real time and have great importance.
At the problems referred to above, for high-durability, high precision, the monitoring in real time that realizes bridge cable cable body, particularly anchor head corrosion.The present invention proposes a kind of drag-line corrosion Quantitative Monitoring method based on optical fiber Brillouin and two kinds of optical fiber sensing technologies of white light interference, realizes the corrosion monitoring to anchor head and the cable body easy-to-rust position that is connected with anchor head.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of bridge fiber drag-line corrosion monitoring sensor.Application realizes drag-line anchor head internal single cable zinc-coated wire measuring point and cable body steel tendon are easily produced the corrosion Quantitative Monitoring of corrosion position based on the optical fiber sensing structure of optical fiber Brillouin sensing technology and optical fiber sensing structure based on the optical fiber white light interference sensing technology.This corrosion monitoring method with the single mode optical fibre of zinc-coated wire outside surface that is wrapped in the steel tendon outside surface or adds bedding mortar as sensing unit, can realize the long-term of steel tendon that corrosion is caused or the circumferential corrosion expansion strain of single zinc-coated wire, stability monitoring.
Technical scheme of the present invention is:
The sensing arrangement of bridge fiber drag-line corrosion monitoring method for sensing comprises: zinc-coated wire corrosion expansion monitoring module, steel tendon corrosion expansion monitoring module, temperature compensation optical fiber grating, signal span line optical cable and protection steel sleeve.The present invention is primarily aimed at two class cable body positions and carries out corrosion monitoring.The first kind is the single zinc-coated wire that is positioned at the anchor head end, and second class is the steel tendon that is positioned at anchor head middle part and cable body inside.At first kind position, the present invention reduces the optical fiber light loss in order to increase the winding radius of optical fiber, makes one deck cement mortar bedding cushion earlier in the zinc-coated wire outside.Then, twine optical fiber on bedding mortar outer cylinder surface and form coil.In order to guarantee that winding around and periphery combine closely, need in winding process, apply an amount of pre-tension stress to optical fiber.Use the monitoring that the realization of optical fiber Brillouin sensing technology is expanded to the zinc-coated wire corrosion; At the second class position, at first in the steel tendon outer felt around one deck breathable adhesive tape, on the column surface two optical fiber are twined side by side then and form two fiber optic coils that closely are fitted to mutually together.The optical fiber Brillouin sensing technology that adopts one of them coil realizes the monitoring to distributed expansion strain, and another coil adopts the optical fiber white light interference sensing technology to realize twining the monitoring of the overall expansion strain of steel tendon in the fiber lengths.Revise environment temperature to the influence of strain monitoring result by another temperature compensation optical fiber grating of sensor internal, make corrosion expansion strain monitoring simultaneously accurate more, realize the measurement of drag-line internal temperature simultaneously.
In the middle of drag-line manufacturing process with steel wire corrosion expansion monitoring module, steel tendon corrosion expansion monitoring module, temperature compensation optical fiber grating and connect each sensing module signal span line optical cable and the protection steel sleeve be laid in anchor head and cable body inside.In actual application, adopt optical fiber Brillouin signal analysis equipment and optical fiber white light interference signal analysis equipment to carry out signals collecting.When the zinc-coated wire at measuring point place in the anchor head produces corrosion under extraneous environmental activity, the volume of the steel material that the volume of the corrosion product that produces in Steel Wire Surface can consume greater than corrosion, thus make the corrosion steel wire to produce expansion to cement mortar bedding cushion.The stretching strain that this expansion produces will cause the stretching strain that is wrapped in optical fiber coil inside on the sand-cement slurry right cylinder.The fiber optic coils stretching strain can be gathered by the optical fiber Brillouin signal analysis equipment.On the other hand, when the part steel wire of anchor head or cable body inner wire bundle or when all steel wire produces corrosion, the corrosion product of Steel Wire Surface accumulation can cause the expansion stretching strain reaction of two fiber optic coils that are wrapped in the steel tendon outside equally.Using the optical fiber Brillouin sensing technology realizes the corrosion expansion strain of one of them fiber optic coils is monitored.According to the optical fiber Brillouin sensing characteristics, can monitor in the coil coiling length the distributed expansion strain information every a segment distance (sensing gauge length: 10cm-50cm, visual equipment performance and decide).Use the optical fiber white light interference sensing technology and realize the corrosion expansion strain monitoring of another fiber optic coils; According to the white light interference technique characteristics, can obtain the average expansion strain information in the whole winding coiling length.Two fiber optic coils measuring objects that twine side by side emphasize particularly on different fields.The optical fiber Brillouin fiber optic coils can monitor the distributed expansion strain in the winding around length, because the strain sensing sensitivity of optical fiber Brillouin is lower, this coil is applicable to and is in the comparatively significantly steel tendon corrosion expansion monitoring of corrosion developing stage.The optical fiber white light interference fiber optic coils can monitor the mean strain in the winding around total length, because its strain sensing is highly sensitive, this coil is applicable to the steel tendon corrosion monitoring that is in the stage corrosion early stage of development, can realize the initial stage corrosion expansion of twining in the fiber lengths is surveyed.
Effect of the present invention and benefit are that the present invention adopts the light transmitting fiber of high-durability as sensing material, proposes to adopt fiber optic coils to realize the monitoring that zinc-coated wire and steel tendon corrosion are expanded.The concrete optical fiber Brillouin sensing device technology that adopts realizes the monitoring that single zinc-coated wire corrosion is expanded.Two kinds of sensing technologies of use in conjunction optical fiber Brillouin and optical fiber white light interference are realized the corrosion monitoring to steel tendon corrosion initial stage and the obvious developing stage of corrosion.Application by temperature compensation optical fiber grating realizes temperature compensation.Because fibre-optic earth silicon material is high durable, makes this sensor have outstanding high-durability characteristics, in conjunction with collecting fiber equipment, can realize long-term, the real-time Quantitative Monitoring of drag-line corrosion.
Description of drawings
Fig. 1 is that bridge fiber drag-line corrosion monitoring sensing arrangement is arranged synoptic diagram;
Fig. 2 is zinc-coated wire corrosion expansion monitoring module diagram;
Fig. 3 is steel tendon corrosion expansion monitoring module diagram;
Fig. 4 is steel tendon corrosion expansion monitoring module cross sectional representation;
Among the figure: 1 zinc-coated wire corrosion expansion monitoring module; 2 steel tendon corrosion expansion monitoring modules; 3 temperature compensation optical fiber gratings; 4 signal span line optical cables and protection steel sleeve; 5 steel pipes; 6 bedding mortars; 7 mortar covers; 8 optical fiber Brillouin fiber optic coils; 9 optical fiber white light interference fiber optic coils; 10 breathable adhesive tape layers; 11 zinc-coated wires; 12 steel tendons; 13 anchor heads-bonnet; 14 anchor heads-anchor slab; 15 anchor heads-anchor circle; 16 anchor heads-anchor backing plate; 17 anchor heads-anchor cup; 18 anchor heads-connecting cylinder; 19 anchor heads-protecgulum; 20 anchor heads-pe sheath; 21 anchor heads-casing
Specific implementation method
The version of drag-line is various, and existing is example with chill casting pier nose anchor structure, is described in detail the specific embodiment of the present invention by reference to the accompanying drawings.For the hot-cast anchor structure, then only need the corrosion expansion strain of measuring steel wire bundle.
The main sensing arrangement of bridge fiber drag-line corrosion monitoring method for sensing comprises: zinc-coated wire corrosion expansion monitoring module, steel tendon corrosion expansion monitoring module, temperature compensation optical fiber grating, signal span line optical cable and protection steel sleeve, as shown in Figure 1.
The present invention adopts zinc-coated wire corrosion expansion monitoring module to realize easily produce the corrosion expansion monitoring of corrosion position zinc-coated wire near the anchor slab end.At first using mould is 2.5mm at measuring point place steel wire outside making thickness, and the bedding mortar of long 50mm guarantees in the manufacturing process that steel wire is positioned at the cylindrical axial location of bedding mortar.At the bedding mortar periphery, evenly individual layer closely twines light transmitting fiber and forms the optical fiber winding around, as shown in Figure 2 then.The used fiber lengths of winding around is 3m, in the winding process, guarantees the tight contact between each small coil.In the winding process, guarantee that fiber optic coils inside has certain pre-tension stress, pre-stretch-draw level is advisable with 1000-2000 μ ε.Treat that the coil winding finishes, adopt 502 cementing agents will twine the optical fiber two ends and be fixed on periphery that two ends optical fiber is drawn.Build the cement mortar protective course that a layer thickness is 2mm in the right cylinder outside at last, finish the encapsulation to zinc-coated wire corrosion expansion monitoring module.This monitoring modular is arranged in steel wire near the position of the easiest generation corrosion in anchor slab end, at the interface circumferencial direction that steel tendon scatters, lays a monitoring modular every 90 °.
The present invention adopts steel tendon corrosion expansion monitoring module to realize the monitoring that steel tendon corrosion in steel tendon in the anchor head and the cable body is expanded.At first at measuring point place steel tendon outside uniform winding one deck breathable adhesive tape.The purpose that adopts breathable adhesive tape is in order to make the steel tendon surfacing, to be fit to twine optical fiber.Simultaneously, breathable adhesive tape can also guarantee not disturb the corrosion chemical environment that causes the steel wire corrosion.Then, at breathable adhesive tape layer outside surface, evenly individual layer closely twines two light transmitting fibers arranged side by side, forms two fiber optic coils that closely are entrenched togather mutually respectively, shown in Fig. 3,4.Twine two used fiber lengths of coil and be respectively 6-10m, in the winding process, guarantee the tight adjacent contact between each small coil.In the winding process, guarantee that fiber optic coils inside has certain pre-tension stress, pre-stretch-draw level is advisable with 1000-2000 μ ε.Treat that the coil winding finishes, adopt 502 cementing agents will twine the optical fiber two ends and be fixed on the breathable adhesive tape surface that two ends optical fiber is drawn.Protect at winding one deck breathable adhesive tape in the outside of two fiber optic coils then.
The present invention adopts temperature compensation optical fiber grating to measure near the temperature of measuring point, carries out corrosion expansion strain temperature compensation by the temperature variation that records.One section of temperature compensation optical fiber grating is kept free, be fixed in the steel pipe, thereby realization realizes temperature survey to the isolation of strain variation.Involved in the present invention to each monitoring modular element of method for sensing sensing arrangement optical fiber of drawing, draw cable body via a routing channel that is constituted by built-in steel pipe.
Claims (2)
1. a bridge fiber drag-line corrosion monitoring sensor comprises zinc-coated wire corrosion expansion monitoring module, steel tendon corrosion expansion monitoring module, temperature compensation optical fiber grating, signal span line optical cable and protection steel sleeve; It is characterized in that, be that the cement mortar bedding cushion outer felt of 2.5mm is around the long fiber optic sensing coil of 3m at thickness; Evenly individual layer closely twines two light transmitting fibers arranged side by side in the steel tendon breathable adhesive tape layer outside, forms two fiber optic coils that closely are entrenched togather mutually respectively; The winding fiber lengths of each coil is 6-10m.
2. a kind of bridge fiber drag-line corrosion monitoring sensor as claimed in claim 1, it is characterized in that, revise environment temperature to the influence of corrosion expansion strain monitoring result by the temperature compensation optical fiber grating that an end freely is fixed in steel duct, make strain monitoring simultaneously accurate more, realize the measurement of cable body internal temperature simultaneously.
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| CN2013102047830A CN103323038A (en) | 2013-05-28 | 2013-05-28 | Optical fiber bridge inhaul cable corrosion monitoring sensor |
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| CN2013102047830A CN103323038A (en) | 2013-05-28 | 2013-05-28 | Optical fiber bridge inhaul cable corrosion monitoring sensor |
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Cited By (2)
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| CN110441148A (en) * | 2019-05-30 | 2019-11-12 | 大连理工大学 | A kind of damnification self-diagnosis and self-positioning steel strand wires intelligence rope |
| CN111189404A (en) * | 2020-01-10 | 2020-05-22 | 北京交通大学 | Steel-concrete composite structure damage measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111189404A (en) * | 2020-01-10 | 2020-05-22 | 北京交通大学 | Steel-concrete composite structure damage measurement system |
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Application publication date: 20130925 |