CN210177368U - Intelligent inhaul cable and fiber reinforced optical fiber lacing wire - Google Patents
Intelligent inhaul cable and fiber reinforced optical fiber lacing wire Download PDFInfo
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- CN210177368U CN210177368U CN201920505512.1U CN201920505512U CN210177368U CN 210177368 U CN210177368 U CN 210177368U CN 201920505512 U CN201920505512 U CN 201920505512U CN 210177368 U CN210177368 U CN 210177368U
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Abstract
The utility model discloses an intelligence cable and fiber reinforcement optic fibre lacing wire, including the sheath and locating the lacing wire in the sheath, at least lacing wire replacement in the sheath is the fiber reinforcement optic fibre lacing wire, fiber reinforcement optic fibre lacing wire includes multicore optic fibre and the fiber reinforcement plastics muscle of parcel around the multicore optic fibre, and the multicore optic fibre is put into muscle central point along fiber reinforcement plastics muscle length direction, makes fiber reinforcement optic fibre lacing wire through pultrusion technology, and when intelligence cable machine-shaping, at least lacing wire in the fiber reinforcement optic fibre lacing wire replacement cable covers the sheath outside the cable and installs the ground tackle, makes the intelligence cable based on multicore optic fibre perception. The utility model discloses combine multicore optic fibre and cable organically, when making the cable possess characteristics such as modulus height, durability are good, resistant creep, can accurately distributed measurement cable body stress variation, bending change, temperature variation and vibration change during the labour service.
Description
Technical Field
The utility model belongs to civil engineering structure field relates to a civil structure safety monitoring and structural material technique, concretely relates to intelligence cable and fiber reinforcement optic fibre lacing wire are applicable to bridge structures, ground structure and large-scale concrete structure.
Background
The stay cable is a core component in a plurality of engineering structures, and due to the influence of the environment, the current stay cable is easy to generate rust, corrode and be damaged by fatigue, the actual service time is far shorter than the designed service time, and great potential safety hazards exist. Therefore, the realization of on-line monitoring, safety assessment and service life estimation of the stay cable in service is very important and has wide prospect. At present, a widely applied inhaul cable monitoring method in engineering comprises the following steps: 1) sensors are arranged outside the inhaul cable, and a vibration wire type sensor and a magnetic flux sensor are commonly used; the vibrating wire type sensor has a heavy self weight, and has negative influence on the stress performance of the stay cable, and the method is only suitable for measuring the stress state of the anchor end of the stay cable; magnetic flux sensors work easily by electromagnetic interference and the method can only make static measurements. 2) Embedding a sensitive element in the inhaul cable; the method has the problems of low element survival rate, unsatisfied monitoring range and the like.
With the continuous maturity and progress of the optical fiber sensing technology, various testing methods based on the optical fiber sensing principle are applied to the monitoring of the inhaul cable structure. The optical fiber has inherent properties of electrical insulation, corrosion resistance, long signal transmission distance, low loss and the like, and a system formed by the optical fiber can not be interfered by a strong magnetic field, high voltage and large current, but the existing monitoring method based on the optical fiber sensing principle has limited measurement precision and poor operability, and cannot comprehensively reflect the stress state, the vibration condition and the development and change rule of the inhaul cable. The multi-core optical fiber is an optical fiber with a plurality of single cores in a single cladding, and each core is used as an independent sensing channel, so that multiple sensing is realized. The distributed sensing technology based on the multi-core optical fiber space division multiplexing has the advantages of the common distributed optical fiber sensing technology, and also has the distributed temperature, stress, vibration and vibration position measuring capabilities, multi-dimensional sensing is realized while long-distance distributed sensing is completed, the result is similar to the effect of removing errors in multiple times of measurement, and the accuracy and precision of measurement are improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of prior art existence, utilize the advantage of multicore optic fibre, provide an intelligent cable based on multicore optic fibre perception. The method compounds the multicore fiber in the fiber reinforced plastic rib to prepare the fiber reinforced fiber tie bar, and the fiber reinforced plastic rib is easy to process and form and has compatibility with the multicore fiber coating layer, so the fiber reinforced fiber tie bar has the good mechanical property and corrosion resistance of the fiber reinforced plastic rib and the sensing characteristic of the multicore fiber, and the defects of weakness and difficult arrangement of the fiber sensor are thoroughly overcome. The manufactured fiber reinforced optical fiber lacing wire is placed in a cable body when the cable is processed and formed, and a jacket is covered outside the cable and an anchorage device is installed to manufacture the intelligent cable based on multi-core optical fiber sensing.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts includes:
the utility model provides an intelligent cable based on multicore optic fibre perception, includes the sheath and locates the lacing wire in the sheath, its characterized in that: at least one lacing wire in the sheath is replaced by a fiber reinforced optical fiber lacing wire, and the fiber reinforced optical fiber lacing wire comprises a multi-core optical fiber and a fiber reinforced plastic rib wrapped around the multi-core optical fiber.
As an improvement, the lacing wire is a lacing wire.
As an improvement, the fiber reinforced plastic rib is any one or a combination of a plurality of fiber reinforced plastic ribs, glass fiber reinforced plastic ribs, aramid fiber reinforced materials and hybrid reinforced plastic ribs.
As an improvement, the number of the cores of the multi-core optical fiber is seven, so that the distinguishing measurement of temperature, stress, vibration and vibration positions is realized, and a regular hexagon with geometric stability is formed on the cross section of the fiber reinforced optical fiber lacing wire.
As an improvement, anchor heads are arranged at two ends of the intelligent inhaul cable, and two ends of the multi-core optical fiber are led out from a preformed hole in each anchor head.
A fiber-reinforced optical fiber tendon, characterized in that: the fiber reinforced plastic rib comprises a multi-core fiber and a fiber reinforced plastic rib wrapped around the multi-core fiber, wherein the multi-core fiber is placed in the center of the rib along the length direction of the fiber reinforced plastic rib, and the fiber reinforced fiber tie bar is manufactured through a pultrusion process.
A method for preparing an intelligent inhaul cable based on multi-core optical fiber sensing is characterized by comprising the following steps:
and 4, adding a sheath on the braided inhaul cable to form the intelligent inhaul cable.
As a modification, in step 4, a sheath made of thermoplastic is applied to the cable by hot extrusion.
The method for detecting the safety state of the intelligent inhaul cable is characterized by comprising the following steps: the multi-core optical fiber comprises a distributed vibration optical fiber and a high-sensitivity vibration optical fiber, and the stress state and the safety degree of the intelligent inhaul cable can be accurately evaluated by using the measurement results of the distributed vibration optical fiber and the high-sensitivity vibration optical fiber, and the specific method comprises the following steps:
acquiring a vibration signal of the intelligent cable under the action of external excitation, performing frequency spectrum analysis on the vibration signal to obtain the natural vibration frequency of the intelligent cable, and then determining the cable force according to the relationship of the frequency and the cable force, wherein the relationship of the frequency and the cable force is determined by the following formula:
k2[2αβ(1-cosαL coshβL)+(α2-β2)sinαL sinhβL]+2kEI(α3cosαL sinhβL-α2βsinαL coshβL+αβ2cosαL sinhβL -β3sinαL coshβL)-(EI)2(α2+β2)2sinαL sinhβL＝0
wherein:
wherein k represents the rotation angle constraint rigidity of the intelligent cable, when the constraint condition of the intelligent cable is simple support, k is 0, when the constraint condition of the intelligent cable is solid support, k is → ∞;
dimensionless parametric check coefficients are introduced for comparison,
under the normal use condition, the check coefficient is close to 0, and the closer the check coefficient is, the safer the check coefficient is; when the check coefficient is smaller than 0, the cable force loss of the intelligent cable is considered, and the rigidity of the cable is reduced.
The multi-core optical fiber also comprises a pair of distributed strain optical fibers and a pair of point-type strain optical fibers, the distributed strain optical fibers and the point-type strain optical fibers are used for monitoring external effects of the bridge, including vehicle load, wind load and extreme weather, and the elastic-optical coefficient rho of the optical fiber materialaIt is known that the measurement yields the variation Δ λ of the reflection wavelength of the optical fiberBFrom the central wavelength λ of the coreBThe core strain ε may be obtained from the relationship between strain ε:
data of the intelligent stay cable in a working state are acquired in a multidimensional mode, real-time mechanical structural characteristics and complex external environment states of the stay cable are synchronously acquired, a complete stay cable health monitoring system is established, and assessment and early warning of the stay cable structure are achieved.
Compared with the prior art, the utility model the advantage lie in:
(1) the multi-core optical fiber provides a good technical means for realizing the on-line real-time monitoring purpose of the stay cable, realizes multi-dimensional sensing while completing long-distance distributed sensing, and can meet the technical requirements of high precision and long-term property of stay cable detection.
(2) The utility model discloses combine the physical mechanics characteristic of fiber reinforcement muscle, the perception characteristic of multicore optic fibre and the atress characteristics development of cable, make the intelligent cable have excellent characteristics such as intensity height, resistant creep, fatigue resistance, monitoring system insertion loss is low moreover, is convenient for be connected with the treater, simple structure, low cost.
(3) The utility model provides a good encapsulation protection of multicore optic fibre has overcome the requirement that multicore optic fibre is difficult to adapt to cable structure extensive formula construction, and the intelligence cable is prefabricated in the mill, has construction convenience, easily arranges, and no installation error need not advantages such as later maintenance.
(4) The utility model discloses fill the vacancy of current building structure reinforcement and monitoring combined technology, realize the long-term dynamic monitoring of multidimension of cable service state, can extensively be used for the engineering structure that needs the cable component such as cable-stay bridge, jib arched bridge, cable rope.
Drawings
Fig. 1 is the cross-sectional schematic view of an embodiment of the intelligent inhaul cable of the utility model.
Fig. 2 is a schematic cross-sectional view of the fiber-reinforced optical fiber lacing wire of the present invention.
In the figure: 1-fiber reinforced optical fiber lacing wire, 2-lacing wire, 3-sheath, 101-multi-core optical fiber, 102-fiber reinforced plastic rib, 103-distributed strain optical fiber, 104-point strain optical fiber, 105-distributed vibration optical fiber, 106-distributed temperature optical fiber and 107-high sensitivity vibration optical fiber.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings and the technical solutions.
Fig. 1 is a schematic cross-sectional view of an embodiment of the present invention, which includes a fiber-reinforced optical fiber tie bar 1, a tie bar 2 (in this embodiment, the tie bar 2 is made of steel wire or steel strand), and a sheath 3. The fiber reinforced optical fiber lacing wire 1 and the lacing wire 2 are subjected to equal-length rough blanking, when the intelligent inhaul cable is processed and formed, the fiber reinforced optical fiber lacing wire 1 replaces at least one lacing wire 2 in the inhaul cable, the outer cover of the inhaul cable is provided with a sheath 3, and the end part of the inhaul cable is provided with an anchor head (not shown in the figure).
Referring to fig. 2, the multicore fiber 101 is placed in the center of the fiber reinforced plastic rib 102 along the length direction thereof, and the fiber reinforced fiber tie bar 1 is manufactured by pultrusion. Since the spatial positions of the respective cores in the multi-core optical fiber 101 are different and the functions are different, the response of the different cores is different when the civil engineering structure shape is changed. The distributed strain optical fiber 103 is connected with the Brillouin distributed sensor, the fiber core is sensitive to temperature and stress, the bending sensitive effect of Brillouin shift frequency can be eliminated by adopting 2 symmetrical distributed strain optical fibers 103, and the result obtained by averaging the 2 distributed strain optical fibers 103 only contains the response of the temperature and the stress; the point type strain optical fiber 104 is connected with a fiber grating sensor, and the fiber core is sensitive to temperature and stress and is used for point type sensing; the distributed vibration optical fiber 105 is connected with a phase sensitive optical time domain reflectometer, and the fiber core is sensitive to vibration and used for distributed vibration measurement; the distributed temperature optical fiber 106 is connected with a Raman optical time domain reflectometer, and the fiber core is only sensitive to temperature and used for distributed temperature measurement and can compensate the temperature measurement result in the distributed strain optical fiber 103; the high-sensitivity vibration optical fiber 107 is connected to a Mach-Zehnder interferometer, and the fiber core is used for high-sensitivity vibration measurement, and since it does not have a spatial localization function, it can be used as a zone-type vibration sensor. However, the multi-core fiber of the present invention is not limited to this type of structure, and other instruments capable of measuring the distributed change of the fiber may be applied to the system.
In the embodiment of the utility model provides an in, the fiber reinforced plastic muscle is one kind or several kinds of arbitrary combinations in carbon fiber reinforced plastic muscle, glass fiber reinforced plastic muscle, aramid fiber reinforced material and the mixed reinforced plastic muscle.
The signal transmission optical fiber of the fiber reinforced plastic rib containing the multi-core optical fiber is led out from the end part of the anchor head, and the end part of the anchor head is provided with a preformed hole.
As a better embodiment, the fiber reinforced optical fiber lacing wire is arranged in the middle of the section of the inhaul cable and in the circumferential direction.
As a more preferred embodiment, the cable body and the corresponding anchorage of the intelligent inhaul cable are one of a clip type inhaul cable, a steel strand whole bundle extrusion type inhaul cable and a parallel steel wire inhaul cable.
The product of the utility model can be manufactured by adopting the following method:
step one, in the preparation process of the fiber reinforced plastic rib 102, calculating the minimum length of an outlet optical cable, embedding a multi-core optical fiber 101 with a proper length into the middle position of the rib along the length direction of the rib, and manufacturing a fiber reinforced optical fiber lacing wire 1 by adopting a hot extrusion method;
step two, equal-length rough blanking is conducted on the lacing wire 2 and the fiber reinforced optical fiber lacing wire 1;
step three, simultaneously placing the fiber reinforced optical fiber lacing wires 1 and the lacing wires 2 into a wire arranging frame, and combining and weaving the fiber reinforced optical fiber lacing wires 1 and the lacing wires 2 into a regular-hexagon stay cable;
fourthly, forming the intelligent inhaul cable by protecting the braided inhaul cable by hot extrusion of high-density polyethylene or by adding other sheaths 3;
and step five, leading out the signal transmission optical cable from the inhaul cable when the inhaul cable is added with the anchorage device.
The cable failure caused by cable steel wire corrosion, anchoring end corrosion, link failure and the like is one of the main objects to be monitored, and the stress state and the safety degree of the intelligent cable can be accurately evaluated by using the measurement results of the distributed vibration optical fiber 105 and the high-sensitivity vibration optical fiber 107. The method comprises the steps of acquiring a vibration signal of the intelligent inhaul cable under the external excitation effect, carrying out frequency spectrum analysis on the vibration signal to obtain the natural vibration frequency of the intelligent inhaul cable, and determining the cable force according to the relationship between the frequency and the cable force. Under general conditions, the frequency-cable force relationship of the stay cable is as follows:
k2[2αβ(1-cosαL coshβL)+(α2-β2)sinαL sinhβL]+2kEI(α3cosαL sinhβL-α2βsinαL coshβL+αβ2cosαL sinhβL -β3sinαL coshβL)-(EI)2(α2+β2)2sinαL sinhβL＝0
wherein:
wherein k represents the rotation angle constraint rigidity of the cable, and when the constraint condition of the cable is simple branch, k is 0, and when the constraint condition of the cable is solid branch, k is → ∞; l represents the length of the stay, T represents the force of the stay, EI represents the bending strength of the stay, m represents the mass per unit length of the stay, and omega represents the natural frequency of vibration of the stay.
Dimensionless parametric check coefficients are introduced for comparison,
under the normal use condition, the check coefficient is close to 0, and the closer the check coefficient is, the safer the check coefficient is; and when the check coefficient is less than 0, the cable force of the cable is considered to be lost, and the rigidity of the cable is reduced. The rigidity of the stay cable can be corrected by adopting an iteration method, the degradation degree of the structural performance of the stay cable is judged, and on the basis, the overall state of the whole bridge is evaluated after the cable force is damaged due to the occurrence of diseases of a stay cable group.
The analysis of the measured bridge natural vibration frequency and the temperature data shows that the bridge natural vibration frequency is reduced along with the rise of the temperature, and the temperature measured by the distributed temperature optical fiber 106 provides a technical basis for evaluating the health condition of the bridge according to the dynamic characteristics, also provides a basis for eliminating the temperature influence in the dynamic characteristics, and avoids the occurrence of misjudgment.
Meanwhile, the distributed strain optical fiber 103 and the point strain optical fiber 104 can be used for monitoring external effects of the bridge, including vehicle load, wind load and extreme weather. Elasto-optic coefficient rho of optical fiber materialaIt is known that the measurement yields the variation Δ λ of the reflection wavelength of the optical fiberBFrom the central wavelength λ of the coreBThe core strain ε may be obtained from the relationship between strain ε:
data of the intelligent stay cable in a working state are acquired through multiple dimensions, real-time mechanical structural characteristics and complex external environment states of the stay cable are synchronously acquired, a complete stay cable health monitoring system can be established, assessment and early warning of the stay cable structure are achieved, and the system has positive significance for ensuring normal operation of a bridge, timely repair of the stay cable and prolonging of service life.
Claims (7)
1. The utility model provides an intelligent inhaul cable, includes the sheath and locates the lacing wire in the sheath, its characterized in that: at least one lacing wire in the sheath is replaced by a fiber reinforced optical fiber lacing wire, and the fiber reinforced optical fiber lacing wire comprises a multi-core optical fiber and a fiber reinforced plastic rib wrapped around the multi-core optical fiber.
2. An intelligent inhaul cable as recited in claim 1, wherein: the lacing wire is a lacing wire.
3. An intelligent inhaul cable as recited in claim 1, wherein: the fiber reinforced plastic rib is any one or combination of a plurality of fiber reinforced plastic ribs, glass fiber reinforced plastic ribs, aramid fiber reinforced materials and hybrid reinforced plastic ribs.
4. An intelligent inhaul cable as recited in claim 1, wherein: the multi-core optical fiber has seven fiber cores to realize the distinguishing measurement of temperature, stress, vibration and vibration position, and a regular hexagon with geometric stability is formed on the section of the fiber reinforced optical fiber lacing wire.
5. An intelligent inhaul cable as claimed in any one of claims 1 to 4, wherein: and anchor heads are arranged at two ends of the intelligent inhaul cable, and two ends of the multi-core optical fiber are led out from preformed holes on the anchor heads.
6. The intelligent cable of claim 1, wherein: the multi-core optical fiber comprises a distributed vibration optical fiber, a high-sensitivity vibration optical fiber, a pair of distributed strain optical fibers and a pair of point strain optical fibers.
7. A fiber-reinforced optical fiber tendon, characterized in that: the fiber reinforced plastic rib comprises a multi-core fiber and a fiber reinforced plastic rib wrapped around the multi-core fiber, wherein the multi-core fiber is placed in the center of the rib along the length direction of the fiber reinforced plastic rib, and the fiber reinforced fiber tie bar is manufactured through a pultrusion process.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109958056A (en) * | 2019-04-15 | 2019-07-02 | 武汉地震工程研究院有限公司 | Smart stay cable, smart stay cable preparation method and smart stay cable safe condition detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109958056A (en) * | 2019-04-15 | 2019-07-02 | 武汉地震工程研究院有限公司 | Smart stay cable, smart stay cable preparation method and smart stay cable safe condition detection method |
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