High-temperature-resistant intelligent cable strand and manufacturing method thereof

Abstract

The invention discloses a high-temperature-resistant intelligent cable strand and a manufacturing method thereof, and belongs to the field of bridge structure cable monitoring, the high-temperature-resistant intelligent cable strand comprises a central full-length steel wire, and a plurality of peripheral full-length steel wires and at least one uw fiber grating intelligent wire are distributed on the periphery of the central full-length steel wire; the uw fiber bragg grating intelligent wire comprises a uw fiber bragg grating device of a cable strand structure, the two ends of the uw fiber bragg grating device are connected with an external demodulator, the uw fiber bragg grating device is arranged on the high-temperature-resistant intelligent cable strand, the high-temperature-resistant intelligent cable strand is arranged in the main cable, and then temperature and humidity data in the main cable are obtained. The temperature and humidity data can be transmitted to an external demodulator, the demodulator senses the spatial distribution of the temperature and humidity in the main cable and the change rule of parameters along with time, the corrosion degree of steel wires in the main cable can be judged, the service life of the main cable structure and the service life of a bridge are prolonged, and the purpose of monitoring the cable in real time is achieved.

Description

Technical Field

[0001] The present invention relates to the field of bridge structure cable monitoring, and in particular to a high-temperature resistant smart cable strand and a manufacturing method thereof. Background Art

[0002] In the field of civil engineering, cable structures are widely used in bridge structures such as suspension bridges, arch bridges and cable-stayed bridges. Cable structures mainly bear tensile forces. Their safety, reliability and durability have a significant impact on the normal use of bridge structures. Cable structures include load-bearing components, anchoring components, protective components, wind-resistant and vibration-resistant components and connecting components. The load-bearing components are mainly composed of steel wires, steel strands or fiber bundles.

[0003] The damage of cable structure is often caused by internal corrosion and broken wires. Therefore, it is important to sense or monitor the internal characteristics of cable structure. Cable structure is generally provided with protective components, such as outer grease layer, outer cement-based material layer, wrapped ribbon and hot-extruded PE sheath, etc., to cope with harsh environmental conditions such as vibration, strong wind, high temperature, rain, ice and snow and high salinity. If the main cable is not opened or the PE sheath is not cut open, it is still difficult to detect the corrosion and broken wires of the cable structure.

[0004] The detection methods for cable structure corrosion and broken wires include visual inspection (rust, iron oxide solution, leachate), guided wave detection, X-ray detection, electromagnetic method, acoustic emission detection and other non-destructive detection methods. However, these methods are only passive behaviors. If the cable is corroded or broken, it cannot be replaced or maintained. These methods cannot continuously perceive the interior of the cable structure in real time and cannot timely assess the severity of steel wire corrosion. Summary of the invention

[0005] The present invention provides a high-temperature resistant smart cable strand and a manufacturing method thereof, which solves the problem that existing cable structure detection methods are unable to continuously perceive in real time and are unable to timely evaluate steel wire corrosion diseases.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a high-temperature resistant smart cable strand, which is passed through the inside of a main cable. The high-temperature resistant smart cable strand comprises a central full-length steel wire, and a plurality of peripheral full-length steel wires and at least one UW fiber grating smart line are arranged on the periphery of the central full-length steel wire. The UW fiber grating smart line comprises a UW fiber grating device in a cable strand structure, and both ends of the UW fiber grating device are connected to an external demodulator. The UW fiber grating device is used to monitor the temperature and humidity data inside the main cable.

[0008] The function of the central full-length steel wire and multiple peripheral full-length steel wires is to protect the UW fiber Bragg grating smart line from longitudinal tension, lateral extrusion and torsional force, which effectively avoids unnecessary damage to the UW fiber Bragg grating smart line caused by external factors and ensures the continuity and accuracy of the monitoring data.

[0009] The basic principle of the high temperature resistant smart cable is: by setting UW fiber grating devices on the high temperature resistant smart cable and setting the high temperature resistant smart cable inside the main cable, the temperature and humidity data inside the main cable can be obtained, and the temperature and humidity data can be transmitted to the external demodulator, which can sense the spatial distribution of temperature and humidity inside the main cable and the change pattern of parameters over time, which is helpful to determine the degree of steel wire corrosion inside the main cable, extend the service life of the main cable structure and the bridge, and achieve the purpose of real-time monitoring of the cable.

[0010] Furthermore, the number of the UW fiber Bragg grating smart lines is two, and the UW fiber Bragg grating devices in the two UW fiber Bragg grating smart lines are respectively a temperature fiber Bragg grating sensor and a humidity fiber Bragg grating sensor. The temperature fiber Bragg grating sensor is used to monitor the temperature parameters of the steel wire inside the main cable in real time, and the humidity fiber Bragg grating sensor is used to monitor the humidity parameters of the steel wire inside the main cable in real time. Combined with the changing trends of temperature parameters and humidity parameters, the humidity inside the main cable can be evaluated in time, and hidden dangers inside the main cable can be discovered as early as possible.

[0011] Furthermore, the UW fiber grating smart line also includes a metal sleeve sleeved at both ends of the UW fiber grating device, the metal sleeve is fixed to the end of the UW fiber grating device by metal casting, and the tube wall of the metal sleeve is provided with a plurality of first through holes along its length direction. The function of the metal sleeve is to protect the end of the UW fiber grating device and prevent the high temperature resistant smart cable from being easily damaged during the anchoring process. The setting of the first through hole is to achieve the connection between the environment of the UW fiber grating smart line and the internal environment of the main cable, to ensure that air can circulate and heat can be smoothly transferred, so as to measure the temperature and humidity parameters inside the main cable.

[0012] Furthermore, the outer periphery of the plurality of the outer continuous steel wires and the UW fiber grating smart line is wrapped with at least one layer of Kevlar braiding, and the Kevlar braiding realizes forming a high temperature resistant smart cable strand with the central continuous steel wire, the plurality of outer continuous steel wires and the UW fiber grating smart line. A plurality of characteristic points are arranged at intervals on the middle section of the UW fiber grating device, and the positions corresponding to the plurality of characteristic points of the UW fiber grating device are fixed to the central continuous steel wire, and the middle section of the UW fiber grating device is in a stress-free state after being fixed.

[0013] Considering that the position of the UW fiber grating device cannot be fixed, the metal sleeve remains hollow to ensure that the UW fiber grating device is in a stress-free state. In the initial state, the temperature-type fiber grating sensor and the humidity-type fiber grating sensor remain in a relaxed state, but the two are relatively fixed at certain feature points at intervals of a certain length, and the fixing method is not limited to pasting or binding, so that when the central through-length steel wire is stressed, the temperature-type fiber grating sensor and the humidity-type fiber grating sensor can maintain a synchronous micro-deformation state in the metal sleeve to ensure accurate measurement of the internal environmental parameters of the main cable. At the same time, when specifically setting the high-temperature resistant smart cable strand, it is also possible to increase its survival rate by simultaneously setting multiple groups of UW fiber grating devices in a single metal sleeve.

[0014] Furthermore, a flow guide tube is provided inside the metal sleeve, the flow guide tube is provided near the end of the UW fiber grating device, and the flow guide tube is connected to an external cooling circulation device. During the metal casting and fixing process, the flow guide tube is used to reduce the temperature of the end of the UW fiber grating device to 75°C to 80°C to avoid damage to the end of the UW fiber grating device.

[0015] Furthermore, the material of the metal sleeve is alloy copper, and a layer of anti-ablation coating is sprayed on the outer surface of the metal sleeve. The anti-ablation coating is a composite material composed of epoxy resin (phenolic resin), graphite, modifier, curing agent and silicon oxide; the anti-ablation coating is a safety measure. If the previous high temperature resistance measures fail, the anti-ablation coating can work, and the coating ablate and absorb heat to protect the internal UW fiber grating device.

[0016] Furthermore, a metal mesh layer is woven on the outer surface of the metal sleeve. The metal mesh layer is a stainless steel wire braid. The metal mesh layer is used to flexibly protect the internal UW fiber grating device and can adapt to the deformation of the cable strand during the processing.

[0017] Furthermore, a glass fiber sleeve is provided on the metal mesh braided layer, and the heat transfer process of the high temperature resistant smart cable strand is from the outside to the inside. Asbestos material is the first layer of measures, mainly for heat insulation. However, asbestos material has very low rigidity and may break when the cable strand is bent. As the second layer of high temperature protection measures, the glass fiber sleeve can provide a certain rigidity and is light in weight. This problem has been discovered in process tests, and this new measure has been proposed.

[0018] Furthermore, the resin type glass fiber sleeve is wrapped with asbestos on the outside, and the anti-ablation coating, the metal mesh braided layer and the glass fiber sleeve are all provided with a plurality of second through holes connected with the plurality of the first through holes.

[0019] The present invention also provides a method for manufacturing a high temperature resistant smart cable strand, which comprises:

[0020] Step 1: Determine the design parameters of the metal casing and asbestos;

[0021] Step 2, spraying an anti-ablation coating on the metal casing;

[0022] Step 3, weave a metal mesh layer on the metal sleeve;

[0023] Step 4, sheathing the glass fiber sleeve on the metal mesh layer;

[0024] Step 5, drilling a plurality of first through holes and second through holes using a drilling device;

[0025] Step 6: Wrap several layers of asbestos around the outside of the metal casing;

[0026] Step 7, fix the metal sleeve to the end of the UW fiber grating device by metal casting. During the casting process, the UW fiber grating device tests the temperature of the surrounding environment in real time, and the external cooling circulation device circulates the cooling medium to the guide pipe to make the temperature of the end of the UW fiber grating device 75℃~85℃; after the metal casting and fixing is completed, the UW fiber grating smart line is obtained;

[0027] Step 8: Arrange the UW fiber grating smart wire and the outer full-length steel wire on the periphery of the central full-length steel wire, and use at least one layer of Kevlar braiding to wrap and fix the UW fiber grating smart wire, the outer full-length steel wire and the central full-length steel wire to obtain a high-temperature resistant smart cable strand.

[0028] The beneficial effects of the present invention are:

[0029] 1. The present invention provides a high temperature resistant smart cable strand. By arranging a UW fiber grating device on the high temperature resistant smart cable strand and arranging the high temperature resistant smart cable strand inside the main cable, the state parameters of multiple positions inside the main cable are measured, the spatial distribution of temperature and humidity inside the main cable can be sensed, and the change law of temperature and humidity parameters inside the cable structure over time can be sensed, which is helpful to determine the degree of steel wire corrosion inside the main cable, extend the service life of the main cable structure and the bridge, and achieve the purpose of real-time monitoring of the cable.

[0030] 2. The high-temperature resistant smart cable strand provided by the present invention can adapt to different regions and climatic conditions, and its end can withstand a high temperature of 600°C, which is convenient for on-site hot-cast anchoring construction of the hot-cast anchor cable system.

[0031] 3. When constructing the main cable of a suspension bridge, especially the reference cable strand, it is generally necessary to adjust the cable. Temperature parameters are needed as corrections. The high-temperature resistant intelligent cable strand provided by the present invention can sense the state within the full-length range and provide temperature field data to the construction control unit. The construction control unit can use it to adjust the cable line shape and sag during construction, which is helpful for the construction control of the cable system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the cross-sectional structure of the high-temperature resistant smart cable.

[0033] Figure 2 Schematic diagram of the opening of the metal casing.

[0034] Figure 3 This is a schematic diagram of the cross-sectional structure of the guide tube arranged in the metal casing.

[0035] Figure 4 Schematic diagram of the longitudinal distribution of high temperature resistant smart cables.

[0036] Figure 5 This is a schematic diagram of the high temperature resistant smart cable strands set inside the main cable.

[0037] Among them, 1. High temperature resistant smart rope; 2. Main cable; 3. Central full-length steel wire; 4. Peripheral full-length steel wire; 5. UW fiber grating smart line; 6. UW fiber grating device; 601. Temperature type fiber grating sensor; 602. Humidity type fiber grating sensor; 7. Metal casing; 8. First through hole; 9. Kevlar braiding; 10. Guide tube; 11. Anti-ablative coating; 12. Metal mesh layer; 13. Glass fiber casing; 14. Asbestos. DETAILED DESCRIPTION

[0038] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0039] like Figure 1 to Figure 3 As shown, the present invention provides a high temperature resistant smart cable strand 1, which is passed through the main cable 2. The high temperature resistant smart cable strand 1 includes a central full-length steel wire 3, and a plurality of peripheral full-length steel wires 4 and at least one UW fiber grating smart line 5 are arranged on the periphery of the central full-length steel wire 3. The UW fiber grating smart line 5 includes a UW fiber grating device 6 in a cable strand structure. Both ends of the UW fiber grating device 6 are connected to an external demodulator, and the UW fiber grating device 6 is used to monitor the temperature and humidity data inside the main cable 2.

[0040] Specifically, Figure 1As shown, the number of the UW fiber Bragg grating smart lines 5 is two, and the UW fiber Bragg grating devices 6 in the two UW fiber Bragg grating smart lines 5 are respectively a temperature fiber Bragg grating sensor 601 and a humidity fiber Bragg grating sensor 602. The temperature fiber Bragg grating sensor 601 is used to monitor the temperature parameters of the steel wire inside the main cable 2 in real time, and the humidity fiber Bragg grating sensor 602 is used to monitor the humidity parameters of the steel wire inside the main cable 2 in real time. Combined with the changing trends of the temperature parameters and the humidity parameters, the humidity inside the main cable 2 can be evaluated in time, and the hidden dangers inside the main cable 2 can be discovered as early as possible.

[0041] The function of the central full-length steel wire 3 and the multiple peripheral full-length steel wires 4 is to protect the UW fiber grating smart line 5 from longitudinal tension, lateral extrusion and torsional force, which effectively avoids unnecessary damage to the UW fiber grating smart line 5 caused by external factors and ensures the continuity and accuracy of the monitoring data.

[0042] like Figure 4 and Figure 5 As shown, by setting the uw fiber grating device 6 in the high temperature resistant smart cable strand 1 and setting the high temperature resistant smart cable strand 1 inside the main cable 2, the arrangement of the high temperature resistant smart cable strand 1 is determined according to the monitoring requirements and the spatial position. Figure 4 This is just a case demonstration. The high-temperature resistant smart cable strand 1 can obtain the temperature and humidity data inside the main cable 2, and can transmit the temperature and humidity data to the external demodulator, which can sense the spatial distribution of temperature and humidity inside the main cable 2 and the change pattern of parameters over time, which helps to determine the degree of steel wire corrosion inside the main cable 2, extend the service life of the main cable 2 structure and the bridge, and achieve the purpose of real-time monitoring of the cable.

[0043] like Figure 2 and Figure 3 As shown, the UW fiber grating smart line 5 also includes a metal sleeve 7 sleeved on both ends of the UW fiber grating device 6, and the metal sleeve 7 is fixed to the end of the UW fiber grating device 6 by metal casting. The tube wall of the metal sleeve 7 is provided with a plurality of first through holes 8 along its length direction. The function of the metal sleeve 7 is to protect the end of the UW fiber grating device 6 and prevent the high temperature resistant smart cable strand 1 from being easily damaged during the anchoring process. The setting of the first through hole 8 is to achieve the connection between the environment of the UW fiber grating smart line 5 and the internal environment of the main cable 2, to ensure that air can circulate and heat can be smoothly transferred, so as to measure the temperature and humidity parameters inside the main cable 2.

[0044] The outer periphery of the plurality of the outer continuous steel wires 4 and the uw fiber grating smart line 5 is wrapped with at least one layer of Kevlar braid 9, and the Kevlar braid 9 realizes forming the central continuous steel wire 3, the plurality of outer continuous steel wires 4 and the uw fiber grating smart line 5 to form a high temperature resistant smart cable strand 1. A plurality of characteristic points are arranged at intervals on the middle section of the uw fiber grating device 6, and the positions corresponding to the plurality of characteristic points of the uw fiber grating device 6 are fixed to the central continuous steel wire 3, and the middle section of the uw fiber grating device 6 is in a stress-free state after being fixed.

[0045] Considering that the position of the uw fiber grating device 6 cannot be fixed, the metal sleeve 7 remains hollow to ensure that the uw fiber grating device 6 is in a stress-free state. In the initial state, the temperature fiber grating sensor 601 and the humidity fiber grating sensor 602 remain in a relaxed state, but the two are relatively fixed at certain feature points at intervals of a certain length, and the fixing method is not limited to pasting or binding, so that when the central full-length steel wire 3 is stressed, the temperature fiber grating sensor 601 and the humidity fiber grating sensor 602 can maintain a synchronous micro-deformation state in the metal sleeve 7 to ensure accurate measurement of the internal environmental parameters of the main cable 2. At the same time, when the high-temperature resistant smart cable strand 1 is specifically set, multiple groups of uw fiber grating devices 6 can also be set in a single metal sleeve 7 to increase its survival rate.

[0046] The metal sleeve 7 is provided with a flow guide 10 inside, and the flow guide 10 is arranged near the end of the UW fiber grating device 6, and the flow guide 10 is connected to an external cooling circulation device. During the metal casting and fixing process, the flow guide 10 is used to reduce the temperature of the end of the UW fiber grating device 6 to 75°C to 85°C by actively controlling the temperature and pressure of the cooling medium in the flow guide 10, so as to avoid damage to the end of the UW fiber grating device 6.

[0047] The material of the metal sleeve 7 is alloy copper, and a layer of anti-ablation coating 11 is sprayed on the outer surface of the metal sleeve 7. The anti-ablation coating is a composite material composed of epoxy resin (phenolic resin), graphite, modifier, curing agent and silicon oxide; the anti-ablation coating is a safety measure. If the previous high temperature resistance measures fail, the anti-ablation coating can work, and the internal UW fiber grating device is protected by ablation and heat absorption of the coating.

[0048] The outer surface of the metal sleeve 7 is woven with a metal mesh layer 12. The metal mesh layer is a stainless steel wire braid, which is used to flexibly protect the internal UW fiber grating device 6 and can adapt to the deformation of the cable strand during the processing.

[0049] A glass fiber sleeve 13 is sleeved on the metal mesh braided layer. The resin-type glass fiber sleeve 13 is wrapped with asbestos 14 on the outside, and the anti-ablation coating 11, the metal mesh braided layer and the glass fiber sleeve 13 are all provided with a plurality of second through holes connected to the plurality of first through holes 8. The heat transfer process of the high-temperature resistant smart cable strand is from the outside to the inside. Asbestos 14 is the first layer of measure, mainly for heat insulation. However, asbestos 14 has very low rigidity and may break when the cable strand is bent. As the second high-temperature protection measure, the glass fiber sleeve 13 can provide a certain rigidity and is light in weight. This problem has been discovered in process tests, and this new measure has been taken.

[0050] The present invention also provides a method for manufacturing a high temperature resistant smart cable strand 1, which comprises:

[0051] Step 1, determine the design parameters of the metal sleeve 7 and the asbestos 14; the design parameters can be obtained by conducting a mechanical test of the metal sleeve 7 and a thermal insulation test of the asbestos 14 in the laboratory; the design parameters specifically include the strength grade, wall thickness, opening diameter, and number of opening columns of the metal sleeve 7; the thickness and number of layers of the asbestos 14.

[0052] Step 2: Use an electric spraying tool to spray the anti-ablation coating 11 on the metal sleeve 7.

[0053] Step 3: Use a braiding wheel to weave a metal mesh layer 12 on the metal sleeve 7.

[0054] Step 4: a glass fiber sleeve 13 is sleeved on the metal mesh layer 12; the glass fiber sleeve 13 can be a graphene glass fiber sleeve.

[0055] Step 5, drilling a plurality of first through holes 8 and second through holes using a drilling device;

[0056] Step 6: Wrap several layers of asbestos 14 around the outside of the metal sleeve 7;

[0057] Step 7, fix the metal sleeve 7 to the end of the UW fiber grating device 6 by metal casting. During the casting process, the UW fiber grating device 6 tests the temperature of the surrounding environment in real time, and the external cooling circulation device circulates the cooling medium to the guide tube 10 to make the temperature of the end of the UW fiber grating device 6 75°C ~ 85°C; after the metal casting and fixing is completed, the UW fiber grating smart line 5 is obtained; during the metal casting and fixing process, by actively controlling the temperature and pressure of the cooling medium in the guide tube 10, the guide tube 10 is used to reduce the temperature of the end of the UW fiber grating device 6 to 75°C ~ 85°C, so as to avoid damage to the end of the UW fiber grating device 6.

[0058] Step 8, arrange the uw fiber grating smart line 5 and the peripheral full-length steel wire 4 on the periphery of the central full-length steel wire 3, and use at least one layer of Kevlar braid 9 to wind and fix the uw fiber grating smart line 5, the peripheral full-length steel wire 4 and the central full-length steel wire 3 to obtain a high-temperature resistant smart cable strand 1. Using the above method, the end of the uw fiber grating device 6 is installed in the metal sleeve 7, and then the zinc-copper alloy is cast in the metal sleeve 7, so that the uw fiber grating device 6 can be protected. At the same time, the high-temperature resistant smart cable strand 1 has a sensing function, which can directly monitor the temperature and humidity inside the main cable 2, and can be used to adjust the internal line shape and sag of the main cable 2. Some data can also be used for construction control, and some data are helpful to evaluate the corrosion inside the main cable 2 during operation.

Claims

1. A high temperature resistant smart cable strand, which is inserted into the main cable, characterized in that: The high temperature resistant smart cable strand comprises a central full-length steel wire, a plurality of peripheral full-length steel wires and at least one UW fiber grating smart line are arranged on the periphery of the central full-length steel wire, the UW fiber grating smart line comprises a UW fiber grating device in a cable strand structure, both ends of the UW fiber grating device are connected to an external demodulator, and the UW fiber grating device is used to monitor the temperature and humidity data inside the main cable.

2. The high temperature resistant smart cable strand according to claim 1, characterized in that: The number of the UW fiber Bragg grating smart lines is two, and the UW fiber Bragg grating devices in the two UW fiber Bragg grating smart lines are respectively a temperature-type fiber Bragg grating sensor and a humidity-type fiber Bragg grating sensor.

3. The high temperature resistant smart cable strand according to claim 2, characterized in that: The UW fiber grating smart line also includes a metal sleeve sleeved on both ends of the UW fiber grating device, the metal sleeve is fixed to the end of the UW fiber grating device by metal casting, and the tube wall of the metal sleeve is provided with a plurality of first through holes along its length direction.

4. The high temperature resistant smart cable strand according to claim 3, characterized in that: The plurality of outer continuous steel wires and the UW fiber grating smart wire are wrapped with at least one layer of Kevlar braiding, a plurality of characteristic points are arranged at intervals on the middle section of the UW fiber grating device, and the positions corresponding to the plurality of characteristic points of the UW fiber grating device are fixed to the central continuous steel wire, and the middle section of the UW fiber grating device is in a stress-free state after being fixed.

5. The high temperature resistant smart cable strand according to claim 4, characterized in that: A flow guide tube is arranged inside the metal sleeve, the flow guide tube is arranged close to the end of the UW fiber grating device, and the flow guide tube is communicated with an external cooling circulation device.

6. The high temperature resistant smart cable strand according to claim 5, characterized in that: The material of the metal sleeve is alloy copper, and a layer of anti-ablation coating is sprayed on the outer surface of the metal sleeve.

7. The high temperature resistant smart cable strand according to claim 6, characterized in that: A metal mesh layer is woven on the outer surface of the metal sleeve.

8. The high temperature resistant smart cable strand according to claim 7, characterized in that: The metal mesh braided layer is sleeved with a glass fiber sleeve.

9. The high temperature resistant smart cable strand according to claim 8, characterized in that: The resin type glass fiber sleeve is wrapped with asbestos on the outside, and the anti-ablation coating, the metal mesh braided layer and the glass fiber sleeve are all provided with a plurality of second through holes connected with the plurality of the first through holes.

10. A method for manufacturing the high temperature resistant smart cable strand according to claim 9, characterized in that: include: Step 1: Determine the design parameters of the metal casing and asbestos; Step 2, spraying an anti-ablation coating on the metal casing; Step 3, weave a metal mesh layer on the metal sleeve; Step 4, sheathing the glass fiber sleeve on the metal mesh layer; Step 5, drilling a plurality of first through holes and second through holes using a drilling device; Step 6: Wrap several layers of asbestos around the outside of the metal casing; Step 7, fix the metal sleeve to the end of the UW fiber grating device by metal casting. During the casting process, the UW fiber grating device tests the temperature of the surrounding environment in real time, and the external cooling circulation device circulates the cooling medium to the guide pipe to make the temperature of the end of the UW fiber grating device 75℃~85℃; after the metal casting and fixing is completed, the UW fiber grating smart line is obtained; Step 8: Arrange the UW fiber grating smart wire and the outer full-length steel wire on the periphery of the central full-length steel wire, and use at least one layer of Kevlar braiding to wrap and fix the UW fiber grating smart wire, the outer full-length steel wire and the central full-length steel wire to obtain a high-temperature resistant smart cable strand.

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