CN210571747U - Intelligent steel strand cable capable of realizing damage self-diagnosis and self-positioning - Google Patents
Intelligent steel strand cable capable of realizing damage self-diagnosis and self-positioning Download PDFInfo
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- CN210571747U CN210571747U CN201921466308.XU CN201921466308U CN210571747U CN 210571747 U CN210571747 U CN 210571747U CN 201921466308 U CN201921466308 U CN 201921466308U CN 210571747 U CN210571747 U CN 210571747U
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Abstract
The utility model provides a damage self-diagnosis and self-align steel strand wires intelligence cable is mainly parallel or twist reverse the beam forming and the hot extruded polyethylene protective casing by the intelligent steel strand wires of multi-beam optic fibre brillouin sensing and makes. Each optical fiber Brillouin sensing intelligent steel strand is formed by taking an optical fiber Brillouin sensing intelligent rib as a central wire, winding a high-ductility metal foil on the surface of the optical fiber Brillouin sensing intelligent rib, and then sequentially reversely twisting the optical fiber Brillouin sensing intelligent rib and an outer wire of the steel strand according to the stripping sequence of the common steel strand, wherein the diameter of the optical fiber Brillouin sensing intelligent rib is the same as that of the central wire of the common steel strand. The utility model provides a damage self-diagnosis and self-align steel strand wires intelligence cable have distributed, full-scale real-time supervision characteristic, can realize carrying out real-time diagnosis and accurate positioning to the local damage of the common form that an arbitrary steel strand wires of an arbitrary optic fibre brillouin sensing intelligence steel strand wires took place in the cable, can extensively be arranged in the health monitoring of cable class structures such as bridge jib and suspension cable and provide important support for its safety in service.
Description
Technical Field
The utility model belongs to the technical field of the health monitoring of cable class structure, concretely relates to steel strand wires intelligence cable damage real-time diagnosis and location technique based on brillouin distributed sensing.
Background
The steel strand is widely applied to prestressed concrete, bridge inhaul cables (such as a stay cable of a cable-stayed bridge, a suspender of an arch bridge, a suspender of a suspension bridge and a main cable), anchor cables for rock and soil slope support, cable nets of a long-span structure and the like. Steel strands are susceptible to corrosion and fatigue damage due to structural features, environmental corrosion, fatigue accumulation, etc., and are key stressed components of these structures. Among various disease types of the steel strand, wire breakage, corrosion and cable tension relaxation are three very common and huge harmful diseases, and the diseases should be found in time and sudden accidents should be prevented, so that the state of the steel strand in service needs to be monitored in full life.
Along with the development of optical fiber sensing technology, many scholars at home and abroad use optical fiber sensing technology to steel strand wires stress, strain monitoring and have studied, wherein the utility model discloses a one of the people of utility model Ouchun duckweed's topic group has carried out comparatively systematic research in this aspect, and they make into intelligent muscle in with fiber grating embedding fiber reinforced resin, again with steel strand wires complex development intelligent steel strand wires. The intelligent steel strand can realize high-precision monitoring of local stress and strain at the distributed points, and has important significance, but the existing intelligent steel strand in the early stage does not pay attention to the problem of accurate positioning of random local damage, such as wire breakage, corrosion and the like, of the stay cable.
The utility model discloses but based on the distributed measurement characteristic of optic fibre brillouin, the utility model discloses an optic fibre brillouin sensing intelligence steel strand wires and by the damage self-diagnosis and the self-align steel strand wires intelligence cable that multi beam optic fibre brillouin sensing intelligence steel strand wires are constituteed, the utility model discloses a to the damage self-diagnosis and the self-align distributed monitoring of root cable, solved the problem that fiber grating intelligence steel strand wires can not full scale monitoring, realized the real-time diagnosis and the location of the normal damage such as disconnected silk of cable, corruption, cable force lax, the utility model discloses an intelligence cable can be arranged in cable class structures such as bridge jib, suspension cable.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a damage self diagnosis and self-align steel strand wires intelligence cable for real-time diagnosis and location.
The technical scheme of the utility model:
a damage self-diagnosis and self-positioning steel strand intelligent cable is composed of a plurality of bundles of optical fiber Brillouin sensing intelligent steel strands 1 which are bundled in parallel or twisted into bundles and hot extruded with a polyethylene protective sleeve 2; each optical fiber Brillouin sensing intelligent steel strand 1 is formed by taking an optical fiber Brillouin sensing intelligent rib 3 as a central wire, winding 2-3 layers of high-ductility metal foils 4 on the surface of the optical fiber Brillouin sensing intelligent rib, and then sequentially reversely twisting the optical fiber Brillouin sensing intelligent rib and an outer wire 5 of a steel strand according to the stripping sequence of the common steel strand, wherein the diameter of the optical fiber Brillouin sensing intelligent rib 3 is the same as that of the common steel strand before stripping; the optical fiber Brillouin sensing intelligent rib 3 is formed by integrally processing an optical fiber 6 serving as a middle beam and a melted high-strength fiber composite material, the optical fiber 6 is located at the central line position of the formed high-strength fiber composite material, and the optical fibers 6 are stripped from two ends of the optical fiber Brillouin sensing intelligent rib 3 and serve as test jumper heads.
The damage self-diagnosis and self-positioning method of the intelligent cable of the steel strand comprises the following steps: after any one bundle of optical fiber Brillouin sensing intelligent steel strand 1 is pulled, the steel strand outer wire 5 extrudes the central wire optical fiber Brillouin sensing intelligent rib 3, and the central wire and the steel strand outer wire 5 deform together along the length direction of the steel strand axis, so that when any one of the steel strand outer wires 5 is damaged at a certain position, the axial strain of the central wire optical fiber Brillouin sensing intelligent rib 3 at the position and the vicinity thereof is remarkably increased, and the optical fiber Brillouin sensing intelligent rib 3 has a distributed strain measurement function and senses the axial strain change at the damaged position or the vicinity thereof in real time; the utility model realizes the real-time self-diagnosis and self-positioning of the damage of the steel strand outer wire 5 according to the principle; the damage self-diagnosis and self-positioning steel strand intelligent cable is composed of a plurality of optical fiber Brillouin sensing intelligent steel strands 1, distributed signals of each optical fiber Brillouin sensing intelligent steel strand 1 are tested and converted into distributed strain in the axial direction, and real-time diagnosis and positioning of damage to any one external wire of any optical fiber Brillouin sensing intelligent steel strand 1 in the intelligent cable are achieved.
The utility model has the advantages that: the utility model provides a per bundle of optic fibre brillouin sensing intelligence steel strand wires 1's central silk optic fibre brillouin sensing intelligence steel strand wires 3 has intensity higher in damage self-diagnosis and the self-align steel strand wires intelligence cable, the durability is good, anti-electromagnetic interference ability is strong, stability advantage such as good, make utility model's damage self-diagnosis and self-align steel strand wires intelligence cable all have full-scale damage real-time diagnosis and location ability to arbitrary steel strand wires mantle 5, can discover its local damage and carry out accurate location in time online automatically, the safety of being in service for the cable structure provides positive support.
Drawings
Fig. 1 is the utility model provides a damage self diagnosis and self-align steel strand wires intelligence cable cross section sketch map.
Fig. 2 is a schematic diagram of a bundle of optical fiber brillouin sensing intelligent steel stranded wires.
Fig. 3 is a schematic cross-sectional view of a bundle of optical fiber brillouin sensing intelligent steel stranded wires.
Fig. 4 shows the distributed axial strain calculated by the numerical model when the optical fiber brillouin sensing intelligent steel strand is damaged at 5 m.
Fig. 5 shows the distributed axial strain calculated by the numerical model when the optical fiber brillouin sensing intelligent steel strand is damaged at 1.5m and 8.5m respectively.
In the figure: 1, optical fiber Brillouin sensing intelligent steel strand; 2, polyethylene protective sleeves; 3 optical fiber Brillouin sensing intelligent bar; 4 a high ductility metal foil; 5, steel strand outer wires; 6 optical fibers.
Detailed Description
In order to more specifically and intuitively explain the working principle and the implementation method of the intelligent cable for the self-diagnosis of damage and the self-positioning steel strand of the utility model, the specific working process of the utility model is explained by combining the attached drawings; this example does not limit the practical scope of the present invention.
The utility model discloses a verification can adopt following experimental method to implement:
step one, selecting two bundles of manufactured optical fiber Brillouin sensing intelligent steel stranded wires 1. Selecting one steel strand outer wire 5 from 6 steel strand outer wires of the first bundle of optical fiber Brillouin sensing intelligent steel strand, and weakening the cross section of the first bundle of optical fiber Brillouin sensing intelligent steel strand at a position 5m away from the fixed end; two out of 6 steel strand outer wires 5 of the second bundle of optical fiber Brillouin sensing intelligent steel strand are selected, the first steel strand is weakened at a position 2.5m away from the fixed end, the second steel strand is weakened at a position 7.5m away from the fixed end, and the weakened edge wires of the first bundle of optical fiber Brillouin sensing intelligent steel strand and the second bundle of optical fiber Brillouin sensing intelligent steel strand are broken in the stress process.
And step two, the two damaged optical fiber Brillouin sensing intelligent steel strands 1 in the step one and other multi-bundle undamaged optical fiber Brillouin sensing intelligent steel strands 1 are jointly manufactured into a damage self-diagnosis and self-positioning steel strand intelligent cable.
And step three, fixing one end of the manufactured damage self-diagnosis and self-positioning steel strand intelligent cable by using an anchorage device, axially tensioning one end of the manufactured damage self-diagnosis and self-positioning steel strand intelligent cable until the damaged edge wires of the two weakened optical fiber Brillouin sensing steel strands 1 are broken in the step one, stopping tensioning, recording the reading on a demodulator, and calculating the axial tensile strain of the undamaged optical fiber Brillouin sensing intelligent steel strand 1 and the axial tensile strain of the weakened optical fiber Brillouin sensing intelligent steel strand according to the change of the optical fiber wavelength.
The axial strain diagram of each distributed measuring point of the undamaged fiber Brillouin sensing intelligent steel strand 1 is approximate to a horizontal line; the axial strain of the damaged optical fiber Brillouin sensing intelligent steel strand 1 at the damaged part and distributed measuring points around the damaged optical fiber Brillouin sensing intelligent steel strand is increased, wherein the damaged part has an obvious strain wave peak value, and the strain near the damaged part is gradually reduced until the strain value of a non-damaged area beyond a certain distance from the damaged part is approximately in the same horizontal line. Based on the phenomenon, local damage such as broken wires, corrosion and the like can be diagnosed and positioned in real time.
In addition, establish steel strand wires finite element model based on ANSYS software and verify the utility model discloses a feasibility:
establishing three finite element models of the optical fiber Brillouin sensing intelligent steel strand 1 with the length of 10m by using ANSYS software; the model 1 is a complete optical fiber Brillouin sensing intelligent steel strand numerical model; the model 2 is an optical fiber Brillouin sensing intelligent steel strand model with a damaged section of an edge wire at a position 5m away from a fixed end; the model 3 is an optical fiber Brillouin sensing intelligent steel strand model with two different edge wire damages, one of which has a section damage at a position 1.5m away from the fixed end, and the other has a section damage at a position 8.5m away from the fixed end.
And step two, one end of each of the three models is fixedly restrained, and the other end of each model is tensioned.
And step three, the model 1 is lossless, so that the axial strain of the model is approximately a horizontal line. The simulation results of the single lesion model 2 and the double lesion model 3 are shown in fig. 4 and 5, respectively: the axial strain at the damaged section in the model 2 is increased by 24.17 percent relative to the normal uniform stress section at the undamaged part far away from the damaged part in the model; axial strains of two damage sections of the model 3, which are 1.5m and 8.5m away from the fixed end, are respectively increased by 24.06 percent and 24.74 percent relative to a normal uniform stress section of a non-damaged part far away from the damage part in the model. As can be seen from fig. 4 and 5, the simulation results of the model 2 under the single damage condition and the model 3 under the double damage condition both successfully diagnose and locate the position of the local damage.
Simulation result shows the utility model provides a damage self-diagnosis and self-align steel strand wires intelligence cable can carry out real-time diagnosis and location to its local damage.
Claims (1)
1. The intelligent cable is characterized by consisting of a multi-beam optical fiber Brillouin sensing intelligent steel strand (1) which is bundled in parallel or twisted into a bundle and hot extruded with a polyethylene protective sleeve (2);
each optical fiber Brillouin sensing intelligent steel strand (1) is formed by taking an optical fiber Brillouin sensing intelligent rib (3) as a central wire, winding 2-3 layers of high-ductility metal foils (4) on the surface of the optical fiber Brillouin sensing intelligent rib, and then sequentially reversely twisting the optical fiber Brillouin sensing intelligent rib and an outer wire (5) of the steel strand according to the stripping sequence of common steel strands, wherein the diameter of the optical fiber Brillouin sensing intelligent rib (3) is the same as that of the common steel strand central wire before stripping;
the optical fiber Brillouin sensing intelligent rib (3) is formed by integrally processing an optical fiber (6) serving as a middle beam and a melted high-strength fiber composite material, the optical fiber (6) is located at the central line position of the formed high-strength fiber composite material, and the optical fiber (6) is stripped at two ends of the optical fiber Brillouin sensing intelligent rib (3) and serves as a test jumper head.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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