Self-supporting spiral suspension optical cable and manufacturing method thereof

Abstract

The invention relates to a self-supporting spiral suspension optical cable and a manufacturing method thereof, the self-supporting spiral suspension optical cable comprises a memory alloy supporting member, a plurality of sleeves are arranged in the circumferential direction of the memory alloy supporting member, and an optical fiber is arranged in each sleeve; and the sheath is coated outside the casing pipes, so that the plurality of casing pipes and the memory alloy supporting pieces are accommodated in the sheath. According to the self-supporting spiral suspension optical cable, the memory alloy supporting piece is arranged in the sheath of the self-supporting spiral suspension optical cable, and the memory alloy supporting piece is similar to an elastic support, so that the self-supporting spiral suspension optical cable can be suspended on a telegraph pole or strung on a cable during construction and laying, and construction is convenient; compared with a fiber supporting piece, the self-supporting spiral suspension optical cable with the memory alloy supporting piece is resistant to acid and alkali, can be used outdoors for a long time, and solves the technical problems that the performance of a self-supporting optical cable is reduced and the chemical resistance is limited when the self-supporting optical cable is exposed for a long time in the related technology.

Description

Technical Field

[0001] The present application relates to the technical field of self-supporting optical cables, and in particular to a self-supporting spiral suspension optical cable and a manufacturing method thereof. Background Art

[0002] With the rapid development of optical communication technology, the demand for high-speed and stable data transmission is growing. Due to its unique structure and performance, the application of self-supporting optical cable in power or communication lines provides an economical and efficient solution.

[0003] In the related art, the self-supporting optical cable adopts special materials and structural design, so that it can support itself and bear the weight of the optical cable itself, without the need for additional metal materials such as steel wire or aluminum wire for support. This kind of optical cable is usually composed of optical fiber, sleeve and support, among which the support is usually made of high-strength material, such as polyamide fiber (FRP), etc., to ensure the stability and reliability of the optical cable. However, the compressive strength of aramid fiber is relatively poor, which means that it does not perform well when subjected to extrusion or compression force. Long-term exposure to sunlight will have a negative impact on the fabric, resulting in its performance degradation and limited chemical resistance. Long-term use at high temperature may cause the material performance to deteriorate, especially without proper protection. Compared with some other types of fibers, such as glass fiber, aramid fiber has a higher cost, which may limit its use in certain cost-sensitive applications.

[0004] Therefore, it is necessary to design a new self-supporting spiral suspension optical cable to overcome the above problems. Summary of the invention

[0005] The present application provides a self-supporting spiral suspension optical cable and a manufacturing method thereof, which can solve the technical problems in the related art that the performance of the self-supporting optical cable is degraded due to long-term exposure to the outside and the chemical resistance is limited.

[0006] In the first aspect, the embodiment of the present application provides a self-supporting spiral suspension optical cable, which includes: a memory alloy support, a plurality of sleeves are arranged in the circumferential direction of the memory alloy support, and an optical fiber is arranged in each sleeve; a sheath, the sheath is coated on the outside of the sleeve, so that the plurality of sleeves and the memory alloy support are accommodated in the sheath. During the construction of the self-supporting spiral suspension optical cable in this embodiment, the self-supporting spiral suspension optical cable also provides a large tension due to its own weight, so that the memory alloy support is stressed, and the optical fiber is not stressed within the elastic deformation. Compared with the normal optical cable, the difference is that the arc of suspension becomes smaller, and the self-supporting spiral suspension optical cable is slightly spiral, so that the total length of the self-supporting spiral suspension optical cable remains unchanged, and the cost of the self-supporting spiral suspension optical cable and the optical fiber will not increase. In addition, the self-supporting spiral suspension optical cable can be used in the field of long-distance trunk lines or access networks to facilitate later recovery and maintenance.

[0007] In combination with the first aspect, in one embodiment, the shape memory alloy support is made of a nickel-titanium-based shape memory alloy, and niobium element is added to the nickel-titanium-based shape memory alloy. In this embodiment, the shape memory alloy support is made of a nickel-titanium-based shape memory alloy (Ni-Ti SMA). By adding niobium (Nb) element, the phase change hysteresis effect can be reduced, and the superelastic stability of the shape memory alloy support in the range of -40°C to 80°C can be improved (strain recovery rate ≥ 99%).

[0008] In combination with the first aspect, in one embodiment, the content of the niobium element is 5-8 wt%.

[0009] In combination with the first aspect, in one embodiment, the diameter of the shape memory alloy support is 1.2-2.0 mm, the pre-tensile strain is 3-5%, and the yield strength ≥ 800 Mpa. In this embodiment, the fatigue life of the shape memory alloy support > 10 7 cycles (simulating wind vibration load).

[0010] In combination with the first aspect, in one embodiment, the sheath adopts a composite system of high-density polyethylene and nano-aluminum oxide. In this embodiment, the sheath adopts a composite system of high-density polyethylene (HDPE) and nano-aluminum oxide (Al 2 O 3 ). Among them, the proportion of high-density polyethylene (HDPE) is 80 wt%, and the proportion of nano-aluminum oxide (Al 2 O 3 ) is 20 wt%. The sheath adopting the composite system of high-density polyethylene (HDPE) and nano-aluminum oxide (Al 2 O 3 ) can improve the anti-ultraviolet and tracking corrosion resistance, achieve a QUV aging test ≥ 5000 hours, and a tracking resistance level ≥ 1A2.5 level; and, in this embodiment, the thickness of the sheath is preferably 2.5 ± 0.2 mm, and the surface roughness Ra ≤ 0.8 μm, which can reduce ice accretion adhesion.

[0011] In combination with the first aspect, in one embodiment, a water blocking powder is filled between multiple sleeves in the sheath, and the particle size of the water blocking powder is 5-10 μm. In this embodiment, inside the sheath, there are gaps between the sheath and the sleeves, between the sleeves and between the sleeves and the shape memory alloy support. A water blocking powder can be added to these gaps between the sheath and the sleeves, between the sleeves and between the sleeves and the shape memory alloy support. The particle size of the water blocking powder is preferably set to 5-10 μm, which can achieve longitudinal water blocking of the self-supporting spiral suspension optical cable, where the water blocking height ≥ 3 m.

[0012] In combination with the first aspect, in one embodiment, the spiral radius R of the self-supporting spiral suspension optical cable and the span L satisfy the following relationship: R = 0.15L + 50 mm, where L ≤ 1000 m.

[0013] In combination with the first aspect, in one embodiment, the spiral radius R of the self-supporting spiral suspension optical cable and the span L satisfy the following relationship: R = 0.12L + 100 mm, where L > 1000 m. In this embodiment, when the self-supporting spiral suspension optical cable is suspended, a spiral deformation will be formed due to its own weight. The spiral radius R and the span L satisfy the relationship: R = 0.15L + 50 mm (L ≤ 1000 m) or R = 0.12L + 100 mm (L > 1000 m), which can achieve wind load dispersion and uniform stress distribution.

[0014] In combination with the first aspect, in one embodiment, the pitch of the self-supporting spiral suspension optical cable is 50 - 100 mm. In this embodiment, the pitch of the self-supporting spiral suspension optical cable is preferably 50 - 100 mm, allowing the self-supporting spiral suspension optical cable to have a lateral swing amplitude ≤ ±0.5 m under an 8-level wind (wind speed 17.2 - 20.7 m / s). Compared with traditional straight optical cables, the self-supporting spiral suspension optical cable in this embodiment can reduce the wind vibration energy by 60%.

[0015] In the second aspect, an embodiment of the present application provides a manufacturing method of the above-mentioned self-supporting spiral suspension optical cable, which includes the following steps:

[0016] Straighten the shape memory alloy with tension and then form a shape memory alloy support member in the self-supporting spiral suspension optical cable by the layer stranding method; or,

[0017] Use the co-extrusion process to form a shape memory alloy support member in the self-supporting spiral suspension optical cable when forming the sheath.

[0018] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:

[0019] By arranging a shape memory alloy support member in the sheath of the self-supporting spiral suspension optical cable, the shape memory alloy support member is similar to an elastic support, enabling the self-supporting spiral suspension optical cable to be suspended on a telegraph pole or strung on a cable during construction and laying, which is convenient for construction. The self-supporting spiral suspension optical cable with a shape memory alloy support member is more acid and alkali resistant than a fiber support member and can be used outdoors for a long time, solving the technical problems in the related art that the performance of the self-supporting optical cable deteriorates after being exposed outdoors for a long time and its chemical resistance is limited. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a cross-sectional view of a self-supporting spiral suspension optical cable provided by an embodiment of the present application;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of a self-supporting spiral suspension optical cable provided by an embodiment of the present application.

[0023] In the figure:

[0024] 1. Shape memory alloy support;

[0025] 2. Sleeve;

[0026] 3. Sheath. Detailed implementation manners

[0027] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0028] The embodiments of the present application provide a self-supporting spiral suspension optical cable and its manufacturing method, which can solve the technical problems in the related art that the performance of the self-supporting optical cable deteriorates after long-term exposure and its chemical resistance is limited.

[0029] See Figure 1 and Figure 2 As shown, a self-supporting spiral suspension optical cable provided by an embodiment of the present application may include: a shape memory alloy support 1, a plurality of sleeves 2 are arranged in the circumferential direction of the shape memory alloy support 1, and each sleeve 2 is provided with an optical fiber; a sheath 3, the sheath 3 covers outside the sleeve 2, so that the plurality of sleeves 2 and the shape memory alloy support 1 are received in the sheath 3.

[0030] See Figure 1As shown, in this embodiment, the shape memory alloy support member 1 is basically located at the central position inside the sheath 3. A plurality of sleeves 2 provided with the optical fibers are evenly distributed around the shape memory alloy support member 1. The sleeve 2 here is preferably a loose tube 2, and the lengths of the sleeve 2 and the optical fiber are the same as those of a normal optical cable. The shape memory alloy support member 1 in this embodiment replaces the polyamide fiber (FRP) inside the self-supporting optical cable in the related art. Under a large tension, the self-supporting spiral suspension optical cable is in a straight state, without difference from a normal optical cable. During construction, due to the self-weight of the self-supporting spiral suspension optical cable also providing a large tension, the shape memory alloy support member 1 is stressed, and the optical fiber is not stressed within the elastic deformation range. The difference from a normal optical cable is that the hanging arc becomes smaller, and the self-supporting spiral suspension optical cable is slightly helical, resulting in the total length of the self-supporting spiral suspension optical cable remaining unchanged and not increasing the costs of the self-supporting spiral suspension optical cable and the optical fiber. In addition, the self-supporting spiral suspension optical cable can be used in long-distance trunk lines or access network fields for convenient later recovery and maintenance.

[0031] In this embodiment, by arranging the shape memory alloy support member 1 inside the sheath 3 of the self-supporting spiral suspension optical cable, the shape memory alloy support member 1 is similar to an elastic support, enabling the self-supporting spiral suspension optical cable to be hung on a telegraph pole or strung on a cable during construction and laying, which is convenient for construction. The self-supporting spiral suspension optical cable with the shape memory alloy support member 1 is acid and alkali resistant compared with the fiber support member and can be used outdoors for a long time, solving the technical problems of the performance degradation and limited chemical resistance of the self-supporting optical cable in the related art when it is exposed outdoors for a long time.

[0032] The traditional ADSS optical cable (all-dielectric self-supporting optical cable) relies on the control of the slack length (the slack length is 0.8 - 1.2%), which greatly reduces the redundancy of design and manufacturing and brings a bottleneck to the application reliability of the optical cable. In this embodiment, the strain decoupling design of the shape memory alloy support member 1 and the optical fiber in the sleeve 2 is adopted. When the self-supporting spiral suspension optical cable is tensioned, the shape memory alloy support member 1 preferentially undergoes superelastic deformation (the strain is 6 - 8%), and only 0.1 - 0.3% of the slack length of the optical fiber needs to be released to ensure that the optical fiber is not stressed. The slack length of the optical fiber is designed to be 0.5 - 0.8%, further reducing the use cost of the optical fiber.

[0033] Furthermore, in one embodiment, the shape memory alloy support member 1 is made of a nickel-titanium-based shape memory alloy, and niobium element is added to the nickel-titanium-based shape memory alloy. In this embodiment, the shape memory alloy support member 1 is made of a nickel-titanium-based shape memory alloy (Ni-Ti SMA). By adding niobium (Nb) element, the phase transformation hysteresis effect can be reduced, and the superelastic stability (the strain recovery rate ≥ 99%) of the shape memory alloy support member 1 in the range of -40°C to 80°C can be improved.

[0034] Further, preferably, the content of niobium element is 5-8 wt%. In this embodiment, the content of niobium element in the shape memory alloy support member 1 is set to 5-8 wt%, which can enhance the anti-kinking ability, avoid optical fiber micro-bending loss, and withstand high-cycle stress (> 10^6 cycles) during the winding / release process of the spiral structure.

[0035] On the basis of the above technical solution, in one embodiment, the diameter of the shape memory alloy support member 1 is 1.2-2.0 mm, the pre-tensile strain is 3-5%, and the yield strength is ≥800 Mpa. In this embodiment, the diameter of the shape memory alloy support member 1 is set to 1.2-2.0 mm, the pre-tensile strain is set to 3-5%, and the yield strength is set to ≥800 Mpa, which can meet the optical cable design specifications. The fatigue life of the shape memory alloy support member 1 > 10^7 cycles (simulating wind vibration load).

[0036] Further, in one embodiment, the sheath 3 adopts a composite system of high-density polyethylene and nano-aluminum oxide. In this embodiment, the sheath 3 adopts a composite system of high-density polyethylene (HDPE) and nano-aluminum oxide (Al 2 O 3 ), where the proportion of high-density polyethylene (HDPE) is 80 wt% and the proportion of nano-aluminum oxide (Al 2 O 3 ) is 20 wt%. The sheath 3 adopting a composite system of high-density polyethylene (HDPE) and nano-aluminum oxide (Al 2 O 3 ) can improve the anti-ultraviolet and tracking corrosion resistance, achieve a QUV aging test ≥ 5000 hours, and a tracking resistance rating ≥ 1A2.5 level; and, in this embodiment, the thickness of the sheath 3 is preferably 2.5 ± 0.2 mm, and the surface roughness Ra ≤ 0.8 μm, which can reduce ice accretion.

[0037] Further, in some alternative embodiments, a water blocking powder is filled between the plurality of sleeves 2 in the sheath 3, and the particle size of the water blocking powder is 5-10 μm. As shown in Figure 1 , inside the sheath 3, there are gaps between the sheath 3 and the sleeve 2, between the sleeve 2 and the sleeve 2, and between the sleeve 2 and the shape memory alloy support member 1. A water blocking powder can be added to these gaps between the sheath 3 and the sleeve 2, between the sleeve 2 and the sleeve 2, and between the sleeve 2 and the shape memory alloy support member 1. The particle size of the water blocking powder is preferably set to 5-10 μm, which can achieve longitudinal water blocking of the self-supporting spiral suspension optical cable, where the water blocking height ≥ 3 m.

[0038] Further, in one embodiment, the spiral radius R and the span L of the self-supporting spiral suspension optical cable may satisfy the following relationship: R = 0.15L + 50 mm, where L ≤ 1000 m.

[0039] In some other alternative embodiments, the spiral radius R and the span L of the self-supporting spiral suspension optical cable may satisfy the following relationship: R = 0.12L + 100 mm, where L > 1000 m. In this embodiment, when the self-supporting spiral suspension optical cable is suspended, it will form a spiral deformation due to its own weight. The spiral radius R and the span L satisfy the relationship: R = 0.15L + 50 mm (L ≤ 1000 m) or R = 0.12L + 100 mm (L > 1000 m), which can achieve wind load dispersion and uniform stress distribution.

[0040] Further, in some embodiments, the pitch of the self-supporting spiral suspension optical cable is 50 - 100 mm. In this embodiment, the pitch of the self-supporting spiral suspension optical cable is preferably 50 - 100 mm, allowing the self-supporting spiral suspension optical cable to have a lateral swing amplitude of ≤ ±0.5 m under an 8 - level wind (wind speed 17.2 - 20.7 m / s). Compared with traditional straight optical cables, the self-supporting spiral suspension optical cable in this embodiment can reduce the wind vibration energy by 60%.

[0041] The self-supporting spiral suspension optical cable provided by the embodiments of the present application is crucial for ensuring the reliability of the optical cable and extending its service life. By using shape memory alloy inside the self-supporting spiral suspension optical cable or using shape memory alloy instead of polyamide fiber (FRP) for the optical cable connection support element, the shape memory alloy is similar to an elastic support, enabling the optical cable to be suspended on a telegraph pole or strung on a cable during construction for convenient construction. This self-supporting spiral suspension optical cable is acid and alkali resistant compared with fiber reinforcement and can be used outdoors for a long time. The length of the outer optical fiber and the sleeve 2 of the shape memory alloy of this self-supporting spiral suspension optical cable is the same as that of a normal optical cable, only replacing the FRP. Under a large tension, the optical cable is in a straight state, no different from a normal optical cable. During construction, due to the weight of the optical cable itself providing a large tension, the alloy is stressed, and within the elastic deformation range, the optical fiber is not stressed. The difference from a normal optical cable is that the hanging arc becomes smaller and the optical cable is slightly spiral, resulting in the total length of the optical cable remaining unchanged and not increasing the cost of the optical cable and the optical fiber. In addition, this optical cable can be used in long-distance trunk lines or access network fields for convenient later recovery and maintenance.

[0042] The embodiments of the present application also provide a manufacturing method of the above-mentioned self-supporting spiral suspension optical cable, which may include the following steps: straightening the shape memory alloy with tension and then forming a shape memory alloy support member 1 inside the self-supporting spiral suspension optical cable by using the layer stranding method; or, forming a shape memory alloy support member 1 inside the self-supporting spiral suspension optical cable by using the co-extrusion process when forming the sheath 3.

[0043] The self-supporting spiral suspension optical cable in this embodiment can be the self-supporting spiral suspension optical cable provided in any of the above embodiments and achieve the corresponding functions.

[0044] In this embodiment, the specifically implemented self-supporting spiral suspension optical cable can be obtained by the following method: The shape memory alloy is straightened with tension and then processed by the layer stranding method or the co-extrusion process is used during the sheath 3 process to integrate the shape memory alloy with the optical cable. When laying the self-supporting spiral suspension optical cable, the center of the arc formed by the self-supporting spiral suspension optical cable is directly passed through the cable between the utility poles or directly suspended. This self-supporting spiral suspension optical cable has a long service life and is easy to recycle, and can withstand higher tensile strength.

[0045] See Figure 1 As shown, the self-supporting spiral suspension optical cable provided by the embodiment of the present application may include: a shape memory alloy support member 1, a plurality of sleeves 2 are arranged in the circumferential direction of the shape memory alloy support member 1, and each sleeve 2 is provided with an optical fiber; a sheath 3, the sheath 3 covers the outside of the sleeve 2, so that the plurality of sleeves 2 and the shape memory alloy support member 1 are received in the sheath 3. In this embodiment, by arranging the shape memory alloy support member 1 in the sheath 3 of the self-supporting spiral suspension optical cable, the shape memory alloy support member 1 is similar to an elastic support, so that the self-supporting spiral suspension optical cable can be suspended on the utility poles or strung on the cable during construction and laying, which is convenient for construction. The self-supporting spiral suspension optical cable with the shape memory alloy support member 1 is more acid and alkali resistant than the fiber support member and can be used outdoors for a long time, solving the technical problems that the performance of the self-supporting optical cable in the related art deteriorates after being exposed outdoors for a long time and the chemical resistance is limited.

[0046] Further, in one embodiment, the shape memory alloy support member 1 is made of a nickel-titanium-based shape memory alloy, and niobium element is added to the nickel-titanium-based shape memory alloy. In this embodiment, the shape memory alloy support member 1 is made of a nickel-titanium-based shape memory alloy (Ni-Ti SMA). By adding niobium (Nb) element, the phase change hysteresis effect can be reduced, and the super-elastic stability (strain recovery rate ≥ 99%) of the shape memory alloy support member 1 in the range of -40°C to 80°C can be improved. Preferably, the content of the niobium element is 5-8 wt%. In this embodiment, the content of the niobium element in the shape memory alloy support member 1 is set to 5-8 wt%.

[0047] Based on the above technical solution, in one embodiment, the diameter of the shape memory alloy support member 1 is 1.2-2.0 mm, the pre-tensile strain is 3-5%, and the yield strength ≥ 800 Mpa. In this embodiment, the fatigue life of the shape memory alloy support member 1 > 10 7 cycles (simulating wind vibration load).

[0048] Further, in one embodiment, the sheath 3 adopts a composite system of high-density polyethylene and nano-aluminum oxide. In this embodiment, the sheath 3 adopts a composite system of high-density polyethylene (HDPE) and nano-aluminum oxide (Al 2 O 3 ). Among them, the proportion of high-density polyethylene (HDPE) is 80wt%, and the proportion of nano-aluminum oxide (Al 2 O 3 ) is 20wt%. The sheath 3 adopting the composite system of high-density polyethylene (HDPE) and nano-aluminum oxide (Al 2 O 3 ) can improve the anti-ultraviolet and tracking corrosion resistance, achieve a QUV aging test of ≥5000 hours, and a tracking resistance level of ≥1A2.5; and, in this embodiment, the thickness of the sheath 3 is preferably 2.5±0.2mm, and the surface roughness Ra≤0.8μm, which can reduce ice accretion.

[0049] Further, in some alternative embodiments, a water-blocking powder is filled between multiple sleeves 2 in the sheath 3, and the particle size of the water-blocking powder is 5-10μm. Inside the sheath 3, there are gaps between the sheath 3 and the sleeves 2, between the sleeves 2 and between the sleeves 2 and the shape memory alloy support member 1. A water-blocking powder can be added to these gaps between the sheath 3 and the sleeves 2, between the sleeves 2 and between the sleeves 2 and the shape memory alloy support member 1. The particle size of the water-blocking powder is preferably set to 5-10μm, which can achieve longitudinal water blocking of the self-supporting spiral suspension optical cable, where the water-blocking height ≥3m.

[0050] Further, in one embodiment, the spiral radius R and the span L of the self-supporting spiral suspension optical cable can satisfy the following relationship: R = 0.15L + 50mm, where L≤1000m. In some other alternative embodiments, the spiral radius R and the span L of the self-supporting spiral suspension optical cable can satisfy the following relationship: R = 0.12L + 100mm, where L>1000m. When the self-supporting spiral suspension optical cable is suspended, it will form a spiral deformation due to its own weight. The spiral radius R and the span L satisfying the above relationship can achieve wind load dispersion and uniform stress distribution.

[0051] Further, in some embodiments, the spiral pitch of the self-supporting spiral suspension optical cable is 50-100mm. In this embodiment, the spiral pitch of the self-supporting spiral suspension optical cable is preferably 50-100mm, allowing the self-supporting spiral suspension optical cable to have a lateral swing amplitude of ≤±0.5m under an 8-level wind (wind speed 17.2-20.7m / s). Compared with traditional straight optical cables, the self-supporting spiral suspension optical cable in this embodiment can reduce the wind vibration energy by 60%.

[0052] The self-supporting spiral suspension optical cable provided by the above embodiments of the present application is an elastic optical cable, which has higher tensile strength, is easy to recycle, easy to construct, has lower cost and longer service life. Moreover, the manufacturing method of the above self-supporting spiral suspension optical cable is compatible with the manufacturing process of conventional optical cables, which is beneficial to the later construction and maintenance of optical cables. The above solution is mainly used in the field of optical cable construction.

[0053] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0054] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0055] The above is only the specific implementation manner of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A self-supporting spiral suspension optical cable, characterized in that: It includes: A memory alloy support (1), wherein a plurality of sleeves (2) are arranged in a circumferential direction of the memory alloy support (1), and an optical fiber is arranged in each sleeve (2); A sheath (3) is provided, wherein the sheath (3) is covered on the outside of the sleeve (2), so that the plurality of sleeves (2) and the memory alloy support member (1) are accommodated in the sheath (3).

2. The self-supporting spiral suspension optical cable according to claim 1, characterized in that: The memory alloy support (1) is made of a nickel-titanium-based shape memory alloy, and niobium is added to the nickel-titanium-based shape memory alloy.

3. The self-supporting spiral suspension optical cable according to claim 2, characterized in that: The content of the niobium element is 5-8wt%.

4. The self-supporting spiral suspension optical cable according to claim 1, characterized in that: The memory alloy support (1) has a diameter of 1.2-2.0 mm, a pre-stretching strain of 3-5%, and a yield strength of ≥800 MPa.

5. The self-supporting spiral suspension optical cable according to claim 1, characterized in that: The sheath (3) is made of a composite system of high-density polyethylene and nano-alumina.

6. The self-supporting spiral suspension optical cable according to claim 1, characterized in that: Water-blocking powder is filled between the plurality of sleeves (2) in the sheath (3), and the particle size of the water-blocking powder is 5 to 10 μm.

7. The self-supporting spiral suspension optical cable according to claim 1, characterized in that: The spiral radius R and the span L of the self-supporting spiral suspension optical cable satisfy the following relationship: R=0.15L+50mm, wherein L≤1000m.

8. The self-supporting spiral suspension optical cable according to claim 1, characterized in that: The spiral radius R and the span L of the self-supporting spiral suspension optical cable satisfy the following relationship: R=0.12L+100mm, wherein L>1000m.

9. The self-supporting spiral suspension optical cable according to claim 7 or 8, characterized in that: The spiral pitch of the self-supporting spiral suspension optical cable is 50-100 mm.

10. A method for manufacturing a self-supporting spiral suspension optical cable as claimed in claim 1, characterized in that: It includes the following steps: The memory alloy is stretched by tension and then twisted in layers to form a memory alloy support member (1) in the self-supporting spiral suspension optical cable; or, When forming the sheath (3), a co-extrusion process is used to form a memory alloy support member (1) in the self-supporting spiral suspension optical cable.

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