CN110847038A - Self-sensing parallel steel wire inhaul cable and manufacturing method thereof - Google Patents
Self-sensing parallel steel wire inhaul cable and manufacturing method thereof Download PDFInfo
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- CN110847038A CN110847038A CN201911335858.2A CN201911335858A CN110847038A CN 110847038 A CN110847038 A CN 110847038A CN 201911335858 A CN201911335858 A CN 201911335858A CN 110847038 A CN110847038 A CN 110847038A
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- 238000000034 method Methods 0.000 claims abstract description 19
- 238000004873 anchoring Methods 0.000 claims description 47
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- 238000012360 testing method Methods 0.000 claims description 24
- 238000005520 cutting process Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
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- 229910052742 iron Inorganic materials 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
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- 238000003466 welding Methods 0.000 claims description 3
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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
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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Abstract
The invention provides a self-sensing parallel steel wire inhaul cable and a manufacturing method thereof. The invention organically combines the fiber grating sensor and the traditional parallel steel wire inhaul cable to form an integrated structure, can effectively monitor and evaluate the environment, stress and loss states of the inhaul cable in the using process, and provides direct information for feedback guidance of inhaul cable installation construction and safety evaluation in the later operation process. The embedded sensor can ensure the survival rate of the sensor, reduces the complex procedures of externally attaching the sensor, eliminates the installation error of the sensor, and can be widely used for the real-time monitoring of the cable force of the guy cable for the bridge rock-soil structure.
Description
Technical Field
The invention relates to the technical field of inhaul cables for bridge geotechnical structure engineering, in particular to a self-sensing parallel steel wire inhaul cable and a manufacturing method thereof.
Background
The guy cable is used as a component bearing tensile force and has been widely applied to the engineering of bridges, rock and soil, buildings and the like, and the guy cable mainly has the forms of a clip anchor, a cold casting anchor, a hot casting anchor and the like. Patent document No. CN 100354471C describes an ultra-high strength parallel steel wire durable pulling cable, which comprises a cable body and cold cast anchors mounted at two ends of the cable body, and adopts a dual anchoring mode of adding grouting material to the pier heads at the ends of the steel wires, thereby having excellent anchoring reliability and anchoring durability. At present, the parallel steel wire inhaul cable is widely applied to bridge structures such as large cable-stayed bridges, arch bridges and the like.
On the other hand, how to realize the real-time monitoring of the stress and loss state of the guy cable of the bridge geotechnical structure and ensure the long-term safety and stability of guy cable structural engineering is also the key of the monitoring technology development of the bridge geotechnical structure engineering. At present, a method for testing the cable force and the damage state of the inhaul cable at home and abroad mainly adopts a magnetic flux sensor, a pressure sensor, a hydraulic sensor and the like. The measuring circuit of the magnetic flux sensor needs to be electrified, the connecting cable is thick and is easy to be interfered, and the magnetic flux sensor is easy to be damaged under severe weather conditions such as thunderstorm and the like; the transmission distance is limited by the resistance of the line, the longer the line is, the larger the error is, and the longest the line is only 200 meters; the sensing coil is an enameled wire, the durability is questionable, multiple corrosion prevention is needed, and the aging possibility exists in long-term monitoring. After the pressure sensor is installed, the size of the anchor head is increased, and the manufacturing and maintenance costs are high. The hydraulic pressure sensor has poor long-term durability and stability, and cannot perform long-term and stable monitoring.
In application number 201710237787.7's patent document, a parallel steel wire bridge intelligence suspension cable has been described, the defect that the unable real-time supervision of the cable body can't be accomplished to the cable body among the prior art has been solved, include the cable body that forms by stranded steel wire wrench joint, be provided with the recess on the periphery of cable body center steel wire, the recess has along the spiral section of center steel wire periphery helicine, is provided with fiber grating strain sensor in the recess, keep apart by the epoxy glue between fiber grating strain sensor and the recess inner wall, the recess is filled and fixed protection fiber grating sensor by the epoxy glue. According to the manufacturing method, the steel wire implanted with the fiber grating sensor is arranged in the center of the inhaul cable, the fiber grating sensor extends out of the end part of the central steel wire, so that the steel wire cannot be subjected to heading, the anchoring performance is affected, the outlet end is arranged outside the wire splitting plate, and the adopted tool is easy to crush the outlet end of the optical fiber when the parts such as the anchor cup are installed, so that the survival rate of the self-sensing inhaul cable is seriously affected. After the steel wire is spirally grooved, although the strain of the grating sensor can be reduced to a certain degree, the overall mechanical property of the steel wire is inferior to that of a steel wire with a linear groove, the steel wire is easy to damage, and the optical fiber is easy to damage when being picked out from the groove, so that the manufacturing process is difficult.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a self-sensing parallel steel wire inhaul cable which is easy to manufacture, high in precision and good in durability and a manufacturing method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a from parallel steel wire cable of perception, includes the anchor subassembly at cable body and both ends, including many parallel arrangement's steel wire, one or many in the cable body be equipped with the recess on the steel wire, the embedded fiber grating sensor that is equipped with of recess, the fiber grating sensor has been written into one or more fiber grating's single mode fiber for one.
By adopting the technical scheme of the invention, the fiber bragg grating sensor and the traditional parallel steel wire inhaul cable are organically combined to form an integrated structure. The fiber grating sensor is connected with the fiber grating demodulator, optical signals representing cable strain obtained by fiber grating sensing are transmitted to the fiber grating demodulator, the environment, stress and loss states of the cable in the using process can be effectively monitored and evaluated, and direct information is provided for feedback guidance of cable installation construction and safety assessment in the later operation process. The embedded sensor can ensure the survival rate of the sensor, reduces the complex procedures of externally attaching the sensor, eliminates the installation error of the sensor, and can be widely used for the real-time monitoring of the cable force of the guy cable for the bridge rock-soil structure.
Furthermore, the steel wire with the groove is positioned on the outermost side of the steel wire combination body in the cable body, and an included angle between the opening direction of the groove and the tangent line of the excircle of the section of the cable body where the steel wire is positioned is less than or equal to 30 degrees.
Adopt above-mentioned preferred scheme, the structure is firm, is avoided being pressed from both sides by the steel wire behind the optical fiber fusion splicing and is disconnected.
Furthermore, the fiber grating sensor is packaged by epoxy resin glue after being embedded into the groove.
Adopt above-mentioned preferred scheme, simple structure is convenient for protect fiber grating sensor.
Further, when the fiber grating sensor is embedded, the steel wire is pretensioned by using pretensioning force of 15-25 kN.
By adopting the preferable scheme, the measuring range of the fiber grating sensor can be improved.
Further, the anchor subassembly includes fixed end anchor part and stretch-draw end anchor part, fixed end anchor part cover is located the stiff end of cable body, stretch-draw end anchor part cover is located the stretch-draw end of cable body.
Adopt above-mentioned preferred scheme, sound construction is convenient for carry out the stretch-draw from the parallel steel wire cable of perception.
Furthermore, the fixed end anchor component and the tensioning end anchor component are both chilled cast anchors.
With the preferred scheme, the anchoring is reliable.
Furthermore, the part of the two ends of the cable body anchored with the anchoring component is a cable body anchoring section, the part between the two cable body anchoring sections is a cable body free section, and the groove for embedding the fiber grating sensor is only positioned in the cable body free section.
By adopting the preferable scheme, the fiber grating sensor can be deformed in coordination with the cable body, and the steel wire groove section does not exist in the stay cable anchoring section, so that the anchoring efficiency can be effectively ensured.
Further, the two ends of the cable body are provided with PE layer stripping sections, one part of the PE layer stripping section is located in the anchoring assembly, the other part of the PE layer stripping section is located outside the anchoring assembly, the cable body is further sleeved with a sleeve, one end of the sleeve is connected to the anchoring assembly, the other end of the sleeve is connected with a sleeve cover plate, the sleeve cover plate is sleeved on the outer circumference of the cable body with the PE layer, the optical fiber end of the optical fiber grating sensor is led out from the PE layer stripping section located outside the anchoring assembly and is welded with an optical fiber testing jumper, and the optical fiber testing jumper is led out from the sleeve and the sleeve cover plate and is wound on the periphery of the cable body.
Adopt above-mentioned preferred scheme, sound construction, convenient test and protect the test jumper wire.
Further, the optical fiber test jumper is connected with the fiber bragg grating demodulator.
By adopting the preferable scheme, the cable force of the inhaul cable can be monitored in real time.
A manufacturing method of a self-sensing parallel steel wire inhaul cable comprises the following steps:
step 1, blanking and rope weaving: preparing a steel wire and a steel wire with an embedded fiber grating sensor in advance, cutting the steel wire and the steel wire according to a specified length, then putting the steel wire and the steel wire into a threading plate together for braiding and bundling, and marking the steel wire with the embedded fiber grating sensor for distinguishing;
step 4, stripping the PE layer and connecting wires: determining the length of a PE stripping layer and stripping the corresponding PE layer according to the specification of the anchorage device; after the PE layer is stripped, finding out a steel wire with an embedded fiber grating sensor, picking out a lead wire hidden in the steel wire by using a special cutter and welding an optical fiber test jumper wire, wherein the optical fiber jumper wire is fixed on a cable body by using an adhesive tape;
By adopting the manufacturing method, the anchoring performance of the self-sensing parallel steel wire inhaul cable is ensured, and the fiber grating sensor is reliably and effectively protected.
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 of 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 one embodiment of a self-sensing parallel wire cable according to the present invention;
FIG. 2 is a partial enlarged view of the self-sensing parallel wire cable tensioning end of the present invention;
FIG. 3 is a cross-sectional structural schematic view of the cable body;
FIG. 4 is a flow chart of the process for making the self-sensing parallel wire cable of the present invention.
Names of corresponding parts represented by numerals and letters in the drawings:
1-a cable body; 101-steel wire; 102-PE layer; 2-fiber grating sensor; 3, testing a jumper wire by using an optical fiber; 301-a weld end; 302-outlet terminal; 4-fixing the end anchor component; 5-tensioning the end anchor component; 6-sleeve cover plate; 7-a sleeve; 8-fiber grating demodulator.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 3, a self-sensing parallel steel wire inhaul cable comprises a cable body 1 and anchoring assemblies at two ends, wherein the cable body 1 comprises a plurality of steel wires 101 which are arranged in parallel, one or more steel wires 101 are provided with grooves, fiber bragg grating sensors 2 are embedded in the grooves, and the fiber bragg grating sensors 2 are single-mode fibers in which one or more fiber bragg gratings are written.
The beneficial effect of adopting above-mentioned technical scheme is: the fiber grating sensor and the traditional parallel steel wire inhaul cable are organically combined to form an integrated structure. The fiber grating sensor is connected with the fiber grating demodulator, optical signals representing cable strain obtained by fiber grating sensing are transmitted to the fiber grating demodulator, the environment, stress and loss states of the cable in the using process can be effectively monitored and evaluated, and direct information is provided for feedback guidance of cable installation construction and safety assessment in the later operation process. The embedded sensor can ensure the survival rate of the sensor, reduces the complex procedures of externally attaching the sensor, eliminates the installation error of the sensor, and can be widely used for the real-time monitoring of the cable force of the guy cable for the bridge rock-soil structure.
In other embodiments of the invention, as shown in fig. 3, the steel wire with the groove is positioned at the outermost side of the steel wire combination body in the cable body, and the included angle between the opening direction of the groove and the tangent of the excircle of the section of the cable body where the steel wire is positioned is less than or equal to 30 degrees. The beneficial effect of adopting above-mentioned technical scheme is: the structure is firm, and the optical fiber is prevented from being pinched off by the steel wire after being welded.
In other embodiments of the present invention, the fiber grating sensor 2 is encapsulated with epoxy glue after being embedded in the groove. The beneficial effect of adopting above-mentioned technical scheme is: the structure is simple, and the fiber grating sensor is convenient to protect.
In other embodiments of the invention, the steel wire is pretensioned with a pretension force of 15-25kN when embedding the fiber grating sensor 2. The beneficial effect of adopting above-mentioned technical scheme is: the measuring range of the fiber grating sensor can be improved.
In other embodiments of the present invention, the anchoring assembly includes a fixed-end anchor member 4 and a tensioned-end anchor member 5, the fixed-end anchor member 4 is sleeved on the fixed end of the cable body 1, and the tensioned-end anchor member 5 is sleeved on the tensioned end of the cable body 1. The beneficial effect of adopting above-mentioned technical scheme is: the structure is firm, and the self-sensing tensioning of the parallel steel wire inhaul cable is convenient.
In other embodiments of the invention, both the fixed end anchor component 4 and the tension end anchor component 5 are chill cast anchors. The beneficial effect of adopting above-mentioned technical scheme is: the anchoring is reliable.
In other embodiments of the present invention, the cable anchoring sections are the cable anchoring sections at the two ends of the cable 1, the cable free section is the section between the two cable anchoring sections, and the groove for embedding the fiber grating sensor is only located in the cable free section. The beneficial effect of adopting above-mentioned technical scheme is: the fiber grating sensor can be deformed in coordination with the cable body, and no steel wire grooving section exists in the cable anchoring section, so that the anchoring efficiency can be effectively guaranteed.
In other embodiments of the invention, both ends of the cable body 1 are provided with PE layer stripping sections for stripping the PE layer 102 on the periphery of the cable body, the PE layer stripping segment is partially positioned in the anchoring component, and the other part of the PE layer stripping segment is positioned outside the anchoring component, the cable body 1 is also sleeved with a sleeve 7, one end of the sleeve 7 is connected to the anchoring assembly, the other end of the sleeve 7 is connected with a sleeve cover plate 6, the sleeve cover plate 6 is sleeved on the outer circumference of the cable body with a PE layer, the optical fiber end part of the fiber bragg grating sensor is led out from the stripping section of the PE layer positioned outside the anchoring assembly and is welded with the optical fiber test jumper 3, the optical fiber test jumper 3 penetrates out of the sleeve 7 and the sleeve cover plate 6 and is wound on the periphery of the cable body 1, in order to clearly show the position of the optical fiber test jumper 3, in fig. 2, a fusion-spliced end 301 of the optical fiber test jumper 3 to which the optical fiber is fusion-spliced is marked, and an external outlet end 302 of the optical fiber test jumper 3 is marked. The beneficial effect of adopting above-mentioned technical scheme is: the structure is firm, the test is convenient, and the test jumper wire is protected.
In other embodiments of the present invention, the fiber test jumpers 3 are connected to a fiber grating demodulator 8. The beneficial effect of adopting above-mentioned technical scheme is: the cable force of the inhaul cable can be monitored in real time.
As shown in fig. 4, a method for manufacturing a self-sensing parallel steel wire inhaul cable comprises the following steps:
step 1, blanking and rope weaving: preparing a steel wire and a steel wire with an embedded fiber grating sensor in advance, cutting the steel wire and the steel wire according to a specified length, then putting the steel wire and the steel wire into a threading plate together for braiding and bundling, and marking the steel wire with the embedded fiber grating sensor for distinguishing;
step 4, stripping the PE layer and connecting wires: determining the length of a PE stripping layer and stripping the corresponding PE layer according to the specification of the anchorage device; after the PE layer is stripped, finding out a steel wire with an embedded fiber grating sensor, picking out a lead wire hidden in the steel wire by using a special cutter and welding an optical fiber test jumper wire, wherein the optical fiber jumper wire is fixed on a cable body by using an adhesive tape;
By adopting the manufacturing method, the anchoring performance of the self-sensing parallel steel wire inhaul cable is ensured, and the fiber grating sensor is reliably and effectively protected.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (10)
1. The utility model provides a from parallel steel wire cable of perception which characterized in that, includes the anchor subassembly at the cable body and both ends, including many parallel arrangement's steel wire, one or many in the cable body be equipped with the recess on the steel wire, the embedded fiber grating sensor that is equipped with of recess, the fiber grating sensor is a single mode fiber who has write into one or more fiber grating.
2. The self-sensing parallel wire cable as claimed in claim 1, wherein the wire with the groove is located at the outermost side of the wire combination body in the cable body, and an angle between the opening direction of the groove and a tangent line of an outer circle of the cross section of the cable body where the wire is located is less than or equal to 30 °.
3. The self-sensing parallel wire cable of claim 1, wherein the fiber grating sensor is encapsulated with epoxy glue after being embedded in the groove.
4. The self-sensing parallel wire cable of claim 1 wherein the wire is pretensioned with a pretension force of 15-25kN when embedding the fiber grating sensor.
5. The self-sensing parallel wire cable of claim 1 wherein said anchor assembly comprises a fixed end anchor member and a tensioned end anchor member, said fixed end anchor member being nested within a fixed end of said cable body and said tensioned end anchor member being nested within a tensioned end of said cable body.
6. The self-sensing parallel wire cable of claim 5 wherein said fixed end anchor member and said tensioned end anchor member are both chill cast anchors.
7. The self-sensing parallel steel wire inhaul cable according to claim 1, wherein the portions of the two ends of the cable body anchored to the anchoring components are cable body anchoring sections, the portion between the two cable body anchoring sections is a cable body free section, and the groove for embedding the fiber grating sensor is only located in the cable body free section.
8. The self-sensing parallel steel wire inhaul cable according to claim 7, wherein the two ends of the cable body are provided with PE layer stripping sections, one part of the PE layer stripping section is located in the anchoring component, the other part of the PE layer stripping section is located outside the anchoring component, the cable body is further sleeved with a sleeve, one end of the sleeve is connected to the anchoring component, the other end of the sleeve is connected with a sleeve cover plate, the sleeve cover plate is sleeved on the outer circumference of the cable body with the PE layer, the optical fiber end part of the fiber grating sensor is led out from the PE layer stripping section located outside the anchoring component and is welded with an optical fiber testing jumper, and the optical fiber testing jumper passes through the sleeve and the sleeve cover plate and is wound on the periphery of the cable body.
9. The self-sensing parallel wire cable of claim 8, wherein the fiber test jumper is connected to a fiber grating demodulator.
10. A method for manufacturing a self-sensing parallel steel wire cable, which is used for manufacturing the self-sensing parallel steel wire cable according to any one of claims 1 to 9, and comprises the following steps:
step 1, blanking and rope weaving: preparing a steel wire and a steel wire with an embedded fiber grating sensor in advance, cutting the steel wire and the steel wire according to a specified length, then putting the steel wire and the steel wire into a threading plate together for braiding and bundling, and marking the steel wire with the embedded fiber grating sensor for distinguishing;
step 2, extrusion molding: drawing the bundled steel wires to an extruding machine for an extrusion molding process, and then cooling the steel wires in a cooling water tank;
step 3, positioning and cutting: positioning and cutting according to the fixed length of the cable body, and marking an optical fiber outlet end;
step 4, stripping the PE layer and connecting wires: determining the length of a PE stripping layer and stripping the corresponding PE layer according to the specification of the anchorage device; after the PE layer is stripped, finding out a steel wire with an embedded fiber grating sensor, picking out a lead wire hidden in the steel wire by using a special cutter and welding an optical fiber test jumper wire, wherein the optical fiber jumper wire is fixed on a cable body by using an adhesive tape;
step 5, installing an anchoring assembly: sequentially penetrating the sleeve cover plate, the sleeve and the anchoring assembly into the cable body; penetrating steel wires into the wire dividing plate and heading the steel wires according to a fixed arrangement mode, and fixing the anchoring assembly on the wire dividing plate after heading is finished;
step 6, grouting and curing: pouring the prepared epoxy iron sand into the anchoring component, compacting by vibration, and then putting into a high-temperature curing furnace for curing;
step 7, ultra-tension testing: and after the solidification is finished, carrying out ultra-tensioning detection, carrying out 10-level tensioning, and calibrating the fiber grating sensor in the tensioning process.
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| CN201911335858.2A CN110847038A (en) | 2019-12-22 | 2019-12-22 | Self-sensing parallel steel wire inhaul cable and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854775A (en) * | 2021-01-08 | 2021-05-28 | 王蔚 | Steel wire structure |
| PL443918A1 (en) * | 2023-02-28 | 2024-09-02 | Politechnika Rzeszowska im. Ignacego Łukasiewicza | Steel tension member containing a fiber optic sensor for assessing and monitoring the technical condition of prestressed and tension building structures and a method of producing a steel tension member strand containing a fiber optic sensor |
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