Replaceable structure of temperature and humidity sensing optical cable with built-in main cable and replacement method thereof
By designing a replaceable main cable with an embedded temperature and humidity sensing optical cable structure, and using segmented arrangement and protective materials, the optical fiber temperature and humidity sensing elements of the main cable of the suspension bridge can be replaced in segments and monitored in the entire range. This solves the problems of difficult sensor replacement and short lifespan, and improves monitoring efficiency and lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-03-27
AI Technical Summary
Existing suspension bridge main cable temperature and humidity monitoring technologies suffer from problems such as susceptibility to electromagnetic interference, poor long-term stability, difficulty in power supply maintenance, and difficulty in sensor replacement. These issues prevent the achievement of full-length or segmental full-area monitoring, and also result in short sensor lifespans.
A replaceable structure for a main cable with built-in temperature and humidity sensing optical cable is designed. The structure uses segmented temperature and humidity sensing optical cables and strands, and the replacement of optical fiber temperature and humidity sensing elements is achieved through a pay-off reel and a take-up reel. The structure is protected by aramid fiber material and spiral armor tube, and reinforced with an outer steel strand structure to provide resistance to mechanical damage.
The system enables segmented replacement of fiber optic temperature and humidity sensors along the entire length of the main cable, improving sensor lifespan and enabling segmented, full-range monitoring of temperature and humidity along the main cable, thus reducing construction difficulty and cost.
Smart Images
Figure CN121740106A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to a replaceable structure of a main cable built-in temperature and humidity sensing optical cable and a replacement method thereof, and belongs to the technical field of optical fiber sensing. BACKGROUND
[0002] At present, the temperature and humidity monitoring of a main cable of a suspension bridge mainly adopts resistance type, capacitance type sensor or wireless sensing node technology, but these methods all have obvious defects. The resistance / capacitance type sensor is susceptible to electromagnetic interference and has poor long-term stability, and the wireless sensing node faces problems such as power supply maintenance difficulty. Although the traditional optical fiber temperature and humidity sensor has the advantage of anti-electromagnetic interference, it is mostly fixed type packaging, and needs to be replaced as a whole after being damaged, which is difficult to construct and has high cost. The existing temperature and humidity monitoring sensor is difficult to realize full-length or segmented global monitoring of the main cable, and the built-in design makes the sensor difficult to replace, thereby reducing the monitoring life of the intelligent main cable. SUMMARY
[0003] The application provides a replaceable structure of a main cable built-in temperature and humidity sensing optical cable and a replacement method thereof, which solves the technical problems in the prior art.
[0004] The technical scheme adopted by the application to solve the above problems is as follows: a replaceable structure of a main cable built-in temperature and humidity sensing optical cable, which comprises a temperature and humidity sensing optical cable and a strand, the strand is provided with the temperature and humidity sensing optical cable arranged in sections in the center, the strand is provided with a pay-off reel and a take-up reel outside, the strand is provided with two lead windows, namely a lead-in window and a lead-out window, the pay-off reel is arranged at the lead-in window, the take-up reel is arranged at the lead-out window, a new optical fiber temperature and humidity sensing element is wound on the pay-off reel, one end of the new optical fiber temperature and humidity sensing element is connected with an old optical fiber temperature and humidity sensing element in the temperature and humidity sensing optical cable, and the other end of the old optical fiber temperature and humidity sensing element is wound on the take-up reel.
[0005] The temperature and humidity sensing optical cable comprises an optical fiber temperature and humidity sensing element, an inner cladding layer is wound on the periphery of the optical fiber temperature and humidity sensing element, the inner cladding layer is sleeved in a protection tube, and an outer cladding layer is wound on the periphery of the protection tube.
[0006] The inner cladding layer is made of aramid fiber material, the protection tube is a spiral armor tube, and the outer cladding layer comprises a plurality of steel strands, and the plurality of steel strands are spirally wound on the periphery of the spiral armor tube.
[0007] The optical fiber temperature and humidity sensing element comprises a humidity measuring type sensing optical fiber and a temperature measuring type sensing optical fiber.
[0008] The cable strand is provided with anchor heads at both ends, and a plurality of cable clamps are arranged on the cable strand.
[0009] The cable strand is provided with an outer circumferential and lengthwise sealing layer.
[0010] A replacement method of a main cable built-in temperature and humidity sensing optical cable, comprising the following steps: Step one: placing a cable drum and a take-up drum outside the cable strand corresponding to the two ends of the temperature and humidity sensing optical cable, Step two: breaking the sealing layer and using a strutting unit to strutting the cable strand steel wires to form an incoming line window and an outgoing line window; Step three: finding the temperature and humidity sensing optical cable and leading the two ends of the temperature and humidity sensing optical cable to the incoming line window and the outgoing line window, so that the two ends of the temperature and humidity sensing optical cable are exposed outside the cable strand; Step four: peeling off the protective tube and the outer sheath of the two ends of the temperature and humidity sensing optical cable to expose the old optical fiber temperature and humidity sensing element with the inner sheath; Step five: winding the one end of the old optical fiber temperature and humidity sensing element with the inner sheath together with the one end of the new optical fiber temperature and humidity sensing element with the inner sheath on the cable drum and fixedly connecting them through glue, and winding the other end of the old optical fiber temperature and humidity sensing element with the inner sheath on the take-up drum; Step six: rotating the take-up drum to wind the old optical fiber temperature and humidity sensing element with the inner sheath on the take-up drum and pull the new optical fiber temperature and humidity sensing element with the inner sheath into the protective tube, so as to realize the replacement of the optical fiber temperature and humidity sensing element.
[0011] The strutting unit comprises two wedge-shaped blocks, and the wedge-shaped blocks are inserted into and strutting the cable strand steel wire gap.
[0012] Compared with the prior art, the advantages of the application are that the replaceable structure and the replacement method of the main cable built-in temperature and humidity sensing optical cable have good thermal response characteristics and gas diffusion characteristics of the outer sheath and the spiral armor tube structure of the temperature and humidity sensing optical cable, which provide good mechanical damage resistance for the internal optical fiber temperature and humidity sensing element, and improve the service life of the temperature and humidity sensing optical cable in the cable strand.
[0013] One steel wire in the center of the cable strand is replaced by a segmented and different length temperature and humidity sensing optical cable, which reduces the resistance and risk brought by long distance replacement, realizes the segmented replacement of the optical fiber temperature and humidity sensing element in the full length range of the main cable, and can realize the segmented and global monitoring of the main cable temperature and humidity. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a cross-sectional view of the built-in temperature and humidity sensing optical cable; Figure 2 It is a local exploded view of the built-in temperature and humidity sensing optical cable; Figure 3 is a schematic diagram of a cable strand cross section; Figure 4 is a schematic diagram of a replaceable structure of a main cable built-in temperature and humidity sensing optical cable of the present application; Figure 5 is a schematic diagram of a wedge-shaped block to open the cable strand position and the lead window; Figure 6 is a schematic diagram of the layout of the main cable built-in temperature and humidity sensing optical cable; Figure 1 temperature and humidity sensing optical cable, 2 outer sheath, 3 spiral armor, 4 moisture sensing optical fiber, 5 temperature sensing optical fiber, 6 inner sheath, 7 pay-off reel, 8 take-up reel, 9 new optical fiber temperature and humidity sensing element, 10 old optical fiber temperature and humidity sensing element, 11 anchor head, 12 cable strand, 13 cable clamp, 14 steel wire, 15 wedge-shaped opening block, 16 lead window, 17 sealing layer. DETAILED DESCRIPTION
[0015] The present application will be further described in detail below with reference to the embodiments of the drawings.
[0016] As shown in Figure 1 , 2 , 3, 5, a replaceable structure of a main cable built-in temperature and humidity sensing optical cable in the present embodiment, including cable strand 12, cable strand 12 includes a plurality of steel wire 14, cable strand 12 center is provided with segmented temperature and humidity sensing optical cable 1, the segmented temperature and humidity sensing optical cable replaces a steel wire 14 in the center of cable strand 12. Temperature and humidity sensing optical cable 1 includes optical fiber temperature and humidity sensing element, the outer periphery of optical fiber temperature and humidity sensing element is covered with inner sheath 6, the optical fiber temperature and humidity sensing element with inner sheath 6 is arranged in protection tube 3, the outer periphery of protection tube 3 is wound with spiral steel strand, forming outer sheath 2. Cable strand 12 is provided with pay-off reel 7 and take-up reel 8 outside, cable strand 12 is provided with two lead windows 16: lead-in window and lead-out window, pay-off reel 7 is arranged at lead-in window, take-up reel 8 is arranged at lead-out window. The new optical fiber temperature and humidity sensing element 9 with inner sheath is wound on pay-off reel 7, the new optical fiber temperature and humidity sensing element 9 with inner sheath is fixedly connected with one end of old optical fiber temperature and humidity sensing element 10 in temperature and humidity sensing optical cable, the other end of old optical fiber temperature and humidity sensing element 10 with inner sheath is wound on take-up reel 8.
[0017] The inner sheath is aramid fiber material. The protection tube is spiral armor 3.
[0018] The optical fiber temperature and humidity sensing element includes moisture sensing optical fiber 4 and temperature sensing optical fiber 5.
[0019] As shown in Figure 4 , 6As shown, the cable strand 12 is provided with an anchor head 11 at each end, and a plurality of cable clamps 13 are arranged on the cable strand 12 and symmetrically locked at equal intervals on the outer periphery of the cable strand in the middle position of the length direction of the cable strand. A continuous sealing layer 17 is arranged on the cable strand.
[0020] A replacement method of a main cable built-in temperature and humidity sensing optical cable, comprising the following steps: Step one: a cable strand is placed outside a take-up reel and a pay-off reel corresponding to the two ends of the temperature and humidity sensing optical cable, and the new optical fiber temperature and humidity sensing element with an inner cladding layer is wound on the pay-off reel.
[0021] Step two: the sealing layer is broken, and the cable strand steel wires are expanded using an expansion unit to form an incoming line window and an outgoing line window.
[0022] Step three: the temperature and humidity sensing optical cable is found and the two ends of the temperature and humidity sensing optical cable are led to the incoming window and the outgoing window, so that the two ends of the temperature and humidity sensing optical cable are exposed from the cable strand.
[0023] Step four: the spiral armor and the outer cladding layer of the two ends of the temperature and humidity sensing optical cable are peeled off to expose the old optical fiber temperature and humidity sensing element with an inner cladding layer.
[0024] Step five: one end of the old optical fiber temperature and humidity sensing element with an inner cladding layer is wound into a bundle with the new optical fiber temperature and humidity sensing element with an inner cladding layer wound on the pay-off reel, and quick-drying glue is used to fix the overlapping winding part so that the two are bonded; the other end of the old optical fiber temperature and humidity sensing element with an inner cladding layer is wound on the take-up reel. Step six: the take-up reel is rotated so that the old optical fiber temperature and humidity sensing element with an inner cladding layer is wound on the take-up reel and the new optical fiber temperature and humidity sensing element with an inner cladding layer is pulled into the protection tube, realizing replacement of the optical fiber temperature and humidity sensing element.
[0025] The above-mentioned expansion unit respectively comprises two wedge-shaped expansion blocks, and the wedge-shaped fixed blocks are respectively inserted into the cable strand steel wire gap to expand the gap and form the incoming line window and the outgoing line window.
[0026] In addition to the above-mentioned embodiments, the present application also includes other implementation manners, and any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present application.
Claims
1. A replaceable structure of a temperature and humidity sensing optical cable with a main cable built-in, characterized in that: The temperature and humidity sensing optical cable and the strand are provided with a temperature and humidity sensing optical cable arranged in segments in the center of the strand, a pay-off reel and a take-up reel are arranged outside the strand, two lead windows, i.e., a lead-in window and a lead-out window, are arranged on the strand, the pay-off reel is arranged at the lead-in window, the take-up reel is arranged at the lead-out window, a new optical fiber temperature and humidity sensing element is wound on the pay-off reel, one end of the new optical fiber temperature and humidity sensing element is connected with an old optical fiber temperature and humidity sensing element in the temperature and humidity sensing optical cable, and the other end of the old optical fiber temperature and humidity sensing element is wound on the take-up reel.
2. The replaceable structure of the main cable built-in temperature and humidity sensing optical cable according to claim 1, characterized in that: The temperature and humidity sensing optical cable comprises an optical fiber temperature and humidity sensing element, an inner cladding layer is wound on the periphery of the optical fiber temperature and humidity sensing element, the inner cladding layer is sleeved in a protective tube, and an outer cladding layer is wound on the periphery of the protective tube.
3. The replaceable structure of the temperature and humidity sensing optical cable with the main cable built-in according to claim 2, characterized in that: The inner cladding layer is made of aramid fiber material, the protective tube is a spiral armor tube, and the outer cladding layer comprises a plurality of steel strands which are spirally wound on the periphery of the spiral armor tube.
4. The replaceable structure of the temperature and humidity sensing optical cable with the main cable built-in according to claim 1, characterized in that: The optical fiber temperature and humidity sensing element comprises a humidity sensing optical fiber and a temperature sensing optical fiber.
5. The replaceable structure of the temperature and humidity sensing optical cable with the main cable built-in according to claim 1, characterized in that: Anchor heads are arranged at the two ends of the strand respectively, a plurality of strand clamps are arranged on the strand respectively, and the strand clamps are symmetrically and equidistantly arranged at the middle position of the strand.
6. The replaceable structure of the temperature and humidity sensing optical cable with the main cable built-in according to claim 5, characterized in that: An outer sealing layer is wrapped on the periphery of the strand.
7. A method for replacing a temperature and humidity sensing optical cable with a built-in main cable according to any one of claims 1-6, characterized in that: The replacement method comprises the following steps: Step 1: a pay-off reel and a take-up reel are arranged outside the strand corresponding to the two ends of the temperature and humidity sensing optical cable, Step 2: the sealing layer is broken, a straining unit is used to strain the steel wires of the strand to form the lead-in window and the lead-out window, Step 3: the temperature and humidity sensing optical cable is found and the two ends of the temperature and humidity sensing optical cable are led to the lead-in window and the lead-out window so that the two ends of the temperature and humidity sensing optical cable are exposed from the strand, Step 4: the protective tube and the outer cladding layer at the two ends of the temperature and humidity sensing optical cable are peeled off to expose the old optical fiber temperature and humidity sensing element with the inner cladding layer, Step 5: one end of the old optical fiber temperature and humidity sensing element with the inner cladding layer is wound together with one end of the new optical fiber temperature and humidity sensing element with the inner cladding layer wound on the pay-off reel, and the two are fixedly connected by glue, and the other end of the old optical fiber temperature and humidity sensing element with the inner cladding layer is wound on the take-up reel, Step 6: the take-up reel is rotated so that the old optical fiber temperature and humidity sensing element with the inner cladding layer is wound on the take-up reel and the new optical fiber temperature and humidity sensing element with the inner cladding layer is pulled into the protective tube, and the replacement of the optical fiber temperature and humidity sensing element is realized.
8. The replacement method of the main cable built-in temperature and humidity sensing optical cable according to claim 7, characterized in that: The straining unit comprises two wedge-shaped blocks which are inserted into and strain the steel wire gap of the strand.