Carbon fiber composite inhaul cable

Abstract

The invention discloses a carbon fiber composite inhaul cable which comprises a stranded wire body composed of a plurality of composite stranded wires and a protective sleeve arranged outside the stranded wire body, and the composite stranded wires comprise a carbon fiber stranded wire, at least two first steel stranded wires and at least two second steel stranded wires. The at least two first steel strands and the at least two second steel strands are alternately arranged and are uniformly stranded at the periphery of the carbon fiber stranded wire. The composite stranded wire has the beneficial effects that the first steel stranded wires and the second steel stranded wires with different diameters are alternately arranged on the periphery of the carbon fiber stranded wires in each composite stranded wire, so that the carbon fiber stranded wires can be protected and supported, and the damage resistance of the carbon fiber stranded wires is enhanced. The overall structural strength of the composite stranded wire is enhanced, stress can be dispersed through the first steel stranded wire and the second steel stranded wire which are different in diameter when the carbon fiber composite inhaul cable bears large tensile force or external force, the stress is prevented from being concentrated on the carbon fiber stranded wire, and the reliability and stability of the carbon fiber composite inhaul cable are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stay cables, and more particularly to a carbon fiber composite stay cable. Background Art

[0002] Traditional cable structures such as cable-stayed bridges, suspension bridges, and cable-arch structures commonly use steel strands or wire bundles as stay cables. However, simply using steel as the stay cable material has potential problems such as poor corrosion resistance, weak fatigue resistance, and high self-weight, which can affect the long-term performance and safety of the structure. In the prior art, stay cables made by compound twisting of carbon fiber and steel wire are usually used to avoid the above problems. However, carbon fiber has poor shear resistance, and it is prone to the problem of high lateral stress after twisting, resulting in uneven internal stress distribution of the stay cable. Summary of the Invention

[0003] To solve the above problems, an object of the present invention is to provide a carbon fiber composite stay cable.

[0004] The present invention provides a carbon fiber composite stay cable, which includes a cable body composed of a plurality of composite strands and a protective sleeve arranged outside the cable body. Among them,

[0005] The composite strand includes a carbon fiber strand, at least two first steel strands, and at least two second steel strands. At least two of the first steel strands and at least two of the second steel strands are alternately arranged and evenly twisted around the carbon fiber strand, and the diameter of the first steel strand is different from that of the second steel strand.

[0006] As a further improvement of the present invention, a plurality of the composite strands are twisted by an interlocking method.

[0007] As a further improvement of the present invention, the composite strand further includes a first protective sleeve, a second protective sleeve, a first positioning sleeve, and a second positioning sleeve. Among them,

[0008] The outer wall of the carbon fiber strand is sleeved with the first protective sleeve;

[0009] At least two of the first steel strands are evenly twisted between the first protective sleeve and the first positioning sleeve;

[0010] At least two of the second steel strands are evenly twisted between the first positioning sleeve and the second positioning sleeve;

[0011] The outer wall of the second positioning sleeve is sleeved with a second protective sleeve.

[0012] As a further improvement of the present invention, a fireproof material is provided between the second positioning sleeve and the second protective sleeve.

[0013] As a further improvement of the present invention, the diameter of the first steel strand is smaller than that of the second steel strand.

[0014] As a further improvement of the present invention, the stranding directions of at least two of the first steel strands and at least two of the second steel strands are the same, and the spiral angles of the two strandings are set to 0°-15°.

[0015] As a further improvement of the present invention, both the first steel strand and the second steel strand are provided in three.

[0016] As a further improvement of the present invention, the protective sleeve is successively provided with an insulating layer, an anti-corrosion layer, and a waterproof layer from the inside to the outside.

[0017] As a further improvement of the present invention, a buffer layer is provided between the anti-corrosion layer and the waterproof layer.

[0018] As a further improvement of the present invention, the carbon fiber composite cable also has a maintenance cable, and the maintenance cable is stranded with a plurality of the composite strands to form the strand body.

[0019] The beneficial effects of the present invention are as follows: By alternately arranging the first steel strands and the second steel strands with different diameters around the carbon fiber strands in each composite strand, not only can the carbon fiber strands be protected and supported, enhancing their anti-damage ability, but also the overall structural strength of the composite strand is strengthened. When the carbon fiber composite cable bears a large tensile force or external force, the stress can be dispersed through the first steel strands and the second steel strands with different diameters, avoiding stress concentration on the carbon fiber strands, and improving the reliability and stability of the carbon fiber composite cable. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 It is a schematic structural diagram of a carbon fiber composite cable according to an exemplary embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of a composite strand in a carbon fiber composite cable according to an exemplary embodiment of the present invention.

[0023] In the figure,

[0024] 1. Strand body; 2. Insulating layer; 3. Anti-corrosion layer; 4. Waterproof layer; 5. Carbon fiber strand; 6. First protective sleeve; 7. First positioning sleeve; 8. Second positioning sleeve; 9. Second protective sleeve; 10. First steel strand; 11. Second steel strand. Detailed implementation manners

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, in the description of the present invention, the terms used are only for the purpose of illustration and are not intended to limit the scope of the present invention. The terms "comprising" and / or "including" are used to specify the presence of the described elements, steps, operations, and / or components, but do not exclude the presence or addition of one or more other elements, steps, operations, and / or components. The terms "first", "second", etc. may be used to describe various elements, do not represent an order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. These terms are only used to distinguish one element from another. With reference to the following drawings, these and / or other aspects become obvious, and it is easier for those of ordinary skill in the art to understand the description of the embodiments of the present invention. The drawings are only used to depict the embodiments of the present invention for the purpose of illustration. Those skilled in the art will easily recognize from the following description that alternative embodiments of the structure and method shown in the present invention can be adopted without departing from the principles described in the present invention.

[0028] As Figure 2 shown, a carbon fiber composite cable according to an embodiment of the present invention includes a cable body 1 composed of a plurality of composite strands and a protective sleeve disposed outside the cable body 1, wherein

[0029] the composite strand includes a carbon fiber strand 5, at least two first steel strands 10 and at least two second steel strands 11. At least two of the first steel strands 10 and at least two of the second steel strands 11 are alternately arranged and evenly stranded around the carbon fiber strand 5, and the diameter of the first steel strand 10 is different from the diameter of the second steel strand 11.

[0030] By alternately arranging the first steel strand 10 and the second steel strand 11 with different diameters around the carbon fiber strand 5 in each composite strand, not only can the carbon fiber strand 5 be protected and supported, reducing the risk of its direct exposure to external forces and enhancing its anti-damage ability, but also the overall structural strength of the composite strand can be strengthened. When the carbon fiber composite cable bears a large tensile force or external force, the stress can be dispersed through the first steel strand 10 and the second steel strand 11 with different diameters, avoiding stress concentration on the carbon fiber strand 5 and improving the reliability and stability of the carbon fiber composite cable.

[0031] Among them, the diameter of the first steel strand 10 can be greater than the diameter of the second steel strand 11. In this case, the first steel strand 10 is the stress-bearing steel strand for bearing the shear force received by the composite strand, and the second steel strand 11 is the supporting steel strand for supporting the first steel strand 10; the diameter of the first steel strand 10 can also be smaller than the diameter of the second steel strand 11. In this case, the first steel strand 10 is the supporting steel strand for supporting the second steel strand 11, and the second steel strand 11 is the stress-bearing steel strand for bearing the shear force received by the composite strand.

[0032] Preferably, the diameter of the steel strand with a larger diameter is 2 to 3 times the diameter of the steel strand with a smaller diameter. A suitable diameter multiple is beneficial to achieving a tighter stranding effect during the stranding process. It can not only enhance the connection firmness between the composite strands, prevent relative slippage between the strands, but also improve the overall anti-loosening ability, ensuring the maintenance of the structural integrity of the carbon fiber composite cable during long-term use. The specific diameters of the steel strands in this application are not limited, as long as the steel strands with different diameters overlap and cover the circumferential surface of the carbon fiber strand 5.

[0033] Preferably, the steel strand is one or more of a single-wire epoxy-coated prestressed steel strand, a filled epoxy-coated steel strand, and a galvanized steel strand, and the carbon fiber strand 5 is one or more of carbon fiber, glass fiber, and aramid fiber. This application does not make specific limitations on this.

[0034] In one implementation, as Figure 1As shown, multiple composite stranded wires are stranded by means of engagement. That is, during the stranding process of multiple composite stranded wires, for two adjacent composite stranded wires, due to the alternating distribution of the first steel stranded wire 10 and the second steel stranded wire 11, the steel stranded wire with a larger diameter in one composite stranded wire can be pressed between two steel stranded wires with larger diameters in another composite stranded wire, and an extrusion effect is generated with the steel stranded wire with a smaller diameter between the two steel stranded wires with larger diameters. This engagement method promotes the formation of a unique interaction mechanism between adjacent composite stranded wires during the stranding process. This not only ensures the stranding stability of the stranded wire body 1, enhances the connection tightness between the composite stranded wires, making them form an organic whole, but also enables a single composite stranded wire to quickly and effectively disperse the force to adjacent composite stranded wires when subjected to a shear force. By sharing the force by multiple composite stranded wires, the bearing capacity of the entire carbon fiber composite cable structure at the corresponding position is greatly improved, and the protection ability for the carbon fiber stranded wire 5 is further enhanced.

[0035] Preferably, as Figure 1 shown, multiple composite stranded wires are arranged in a honeycomb pattern, making the entire stranded wire body 1 have higher strength, and can further improve the overall stability and fatigue resistance of the carbon fiber composite cable.

[0036] As Figure 2 shown, taking the diameter of the first steel stranded wire 10 being smaller than the diameter of the second steel stranded wire 11 as an example for illustration, that is, during the stranding process of multiple composite stranded wires, for two adjacent composite stranded wires, the second steel stranded wire 11 of the left composite stranded wire is pressed between the two second steel stranded wires 11 of the right composite stranded wire along the direction of the arrow, and an extrusion effect is generated with the first steel stranded wire 10 between the two second steel stranded wires 11 of the right during stranding. Stranding each composite stranded wire in sequence according to the above engagement method, finally obtaining the stranded wire body 1 arranged in a honeycomb pattern.

[0037] In one embodiment, as Figure 2 shown, the composite stranded wire further includes a first protective sleeve 6, a second protective sleeve 9, a first positioning sleeve 7, and a second positioning sleeve 8, wherein,

[0038] the first protective sleeve 6 is sleeved on the outer wall of the carbon fiber stranded wire 5;

[0039] at least two of the first steel stranded wires 10 are evenly stranded between the first protective sleeve 6 and the first positioning sleeve 7;

[0040] at least two of the second steel stranded wires 11 are evenly stranded between the first positioning sleeve 7 and the second positioning sleeve 8;

[0041] the second protective sleeve 9 is sleeved on the outer wall of the second positioning sleeve 8.

[0042] Among them, the first protective sleeve 6 and the second protective sleeve 9 provide a direct physical barrier for the carbon fiber stranded wire 5, which can not only prevent the carbon fiber stranded wire 5 from being eroded by external environmental factors (such as moisture, chemical corrosive substances, etc.), but also avoid scratches, abrasions and other damages on the surface of the carbon fiber stranded wire 5, maintain its structural integrity, and ensure that its mechanical properties are not affected. The first positioning sleeve 7 and the second positioning sleeve 8 position the steel stranded wire. The first positioning sleeve 7 ensures that the first steel stranded wire 10 can be stranded circumferentially at equal intervals outside the carbon fiber stranded wire 5; the second positioning sleeve 8 further controls the relative position relationship between the second steel stranded wire 11 and the first steel stranded wire 10, realizes the alternating and orderly arrangement between the first steel stranded wire 10 and the second steel stranded wire 11, enables them to cooperate with each other, and forms a stable support structure.

[0043] Further, a fireproof material is provided between the second positioning sleeve 8 and the second protective sleeve 9. It has certain heat insulation performance, can reduce the influence of heat transfer on the internal structure, protect the structural integrity of the internal steel stranded wire and the carbon fiber stranded wire 5, and can also isolate heat transfer in extreme situations such as fires, thereby protecting the internal components from high-temperature damage, improving the fireproof grade of the carbon fiber composite cable, and extending the service life of the carbon fiber composite cable under extreme conditions.

[0044] Preferably, the fireproof material is made of rock wool, aluminum silicate wool or fireproof cotton thread, and the present application does not make specific limitations on this.

[0045] Further, as Figure 2 shown, the diameter of the first steel stranded wire 10 is smaller than the diameter of the second steel stranded wire 11. The shapes and sizes of the first positioning sleeve 7 and the second positioning sleeve 8 are made to conform to the first steel stranded wire 10 and the second steel stranded wire 11 to accurately fix them, and to avoid the situation where when the diameter of the first steel stranded wire 10 is larger than the diameter of the second steel stranded wire 11, the second positioning sleeve 8 is lifted by the first positioning sleeve 7 of the first steel stranded wire 10 with a larger diameter, resulting in the inability to accurately fix the second steel stranded wire 11.

[0046] In one embodiment, at least two of the first steel stranded wires 10 and at least two of the second steel stranded wires 11 have the same stranding direction, and the spiral angle of their stranding is set to 0°-15°. The smaller spiral angle makes the steel stranded wire more approaching a straight state after stranding. It can not only reduce the stress change amplitude and frequency of the steel stranded wire during the cyclic loading process, reduce the initiation and propagation of fatigue cracks caused by stress concentration and repeated bending, make the carbon fiber composite cable have better flexibility and adaptability, and to a certain extent adapt to different installation angle and bending radius requirements. Moreover, compared with a large spiral angle, the lateral component force generated by the smaller spiral angle during loading is significantly reduced, which can effectively protect the structural integrity of the carbon fiber stranded wire 5.

[0047] In one embodiment, both the first steel strands 10 and the second steel strands 11 are provided in three. This enables the first steel strands 10 and the second steel strands 11 to form a more stable triangular support structure after stranding.

[0048] Among them, the triangular support structure includes a triangular support structure composed of a larger-diameter steel strand and two adjacent smaller-diameter steel strands, a triangular support structure composed of three larger-diameter steel strands respectively, and a triangular support structure composed of three smaller-diameter steel strands. Taking the case where the diameter of the first steel strand 10 shown is smaller and the diameter of the second steel strand 11 is larger as an example, the triangular support structure includes a triangular support structure formed between the adjacent first steel strand 10 and the second steel strand 11, and triangular support structures respectively formed by three first steel strands 10 and three second steel strands 11. When the carbon fiber composite cable is subjected to tensile force, pressure or other external forces, this triangular support structure can effectively resist deformation, maintain the shape stability of the composite strands and even the entire carbon fiber composite cable, and reduce the risk of performance degradation caused by structural deformation. For example, after the second steel strand 11 is stressed, it will transfer the force to the two first steel strands 10 through the first positioning sleeve 7 and the second positioning sleeve 8, reducing the pressure borne by the second steel strand 11. Figure 2 In one embodiment, the protective sleeve is sequentially provided with an insulating layer 2, an anti-corrosion layer 3 and a waterproof layer 4 from the inside out.

[0049] Among them, the insulating layer 2 is a polyethylene plastic pipe, sleeved outside the stranded wire body. The polyethylene material itself has characteristics such as a low dielectric constant and a high breakdown strength, which can effectively block external current interference, ensure the normal operation of the stranded wire in a complex electrical environment, and minimize safety hazards such as electric leakage.

[0050] The anti-corrosion layer 3 is a polypropylene rope, fixedly wound outside the insulating layer 2, which can resist the erosion of factors such as acid-base substances and humid air in the surrounding environment on the stranded wire. Preferably, asphalt is coated on the outside of the anti-corrosion layer 3. Asphalt not only has strong waterproof and anti-corrosion effects, but also can fill the possible tiny gaps between the polypropylene ropes to form a more continuous and dense protective layer. The asphalt is coated with a reinforced steel wire mesh on the outside. The steel wire mesh and the asphalt cooperate with each other to further enhance the strength of the overall structure, making the anti-corrosion layer 3 more resistant to external physical impacts and further enhancing the anti-corrosion ability.

[0051]

[0052] ​The waterproof layer 4 is a waterproof rubber sleeve coaxially arranged with the insulating layer 2, which can effectively prevent the penetration of rainwater, groundwater and other liquid media, ensure that the stranded wire body 1 is always in a dry working environment, avoid problems such as reduced insulation performance and rust of metal parts caused by moisture, ensure the stable performance of the stranded wire body 1, reduce the subsequent maintenance cost, and ensure that the carbon fiber composite cable can operate stably for a long time.

[0053] It is understandable that the present application does not specifically limit the materials used to make the insulating layer, the anti-corrosion layer and the waterproof layer.

[0054] In one embodiment, a buffer layer is provided between the anti-corrosion layer 3 and the waterproof layer 4. The buffer layer comprises an outer buffer sleeve and an inner buffer sleeve coaxially arranged, the cross-section of the inner buffer sleeve is a rhombus, and a V-shaped folded plate is symmetrically fixedly connected to the inner wall thereof.

[0055] When the carbon fiber composite cable is initially impacted, the impact force will first act on the outer waterproof layer 4, and then be transmitted to the outer buffer sleeve, squeezing the outer buffer sleeve to deform. After the outer buffer sleeve is deformed, it will pull the inner buffer sleeve, pulling the inner buffer sleeve to deform accordingly. At this time, the four sides of the diamond in the inner buffer sleeve can flexibly change their shape when subjected to force, effectively dispersing and transmitting the impact force, further enhancing the overall buffering effect. As the impact force continues to act, when it reaches a certain level, the inner buffer sleeve will deform more significantly under the dual effects of pulling and direct impact. At this time, the V-shaped folding plate can provide strong support to the inner wall of the inner buffer sleeve by virtue of its own angle and structural characteristics, preventing the inner buffer sleeve from excessive deformation or even collapse, thereby maintaining the stability and integrity of the entire buffer layer, ensuring that it can continuously and effectively absorb and buffer the impact force, protecting the carbon fiber composite cable and the related structures connected to it from impact damage to the greatest extent, and ensuring that the entire system can still operate stably and reliably under complex working conditions.

[0056] In one embodiment, the carbon fiber composite cable is further provided with a maintenance cable, which is twisted with a plurality of the composite strands to form the strand body 1. When the carbon fiber composite cable is working for a long time, the carbon fiber strands 5 and steel strands inside it are inspected and repaired in time.

[0057] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0058] In addition, those of ordinary skill in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments rather than others, combinations of features of different embodiments are meant to be within the scope of the present invention and form different embodiments.

[0059] Those skilled in the art should understand that although the present invention has been described with reference to exemplary embodiments, various changes can be made and elements thereof can be replaced with equivalents without departing from the scope of the present invention. Additionally, many modifications can be made to adapt a particular situation or material to the teachings of the present invention without departing from the essential scope thereof.

Claims

1. A carbon fiber composite cable, characterized in that, It includes a stranded wire body composed of multiple composite stranded wires and a protective sleeve arranged outside the stranded wire body. Among them, the composite stranded wire includes a carbon fiber stranded wire, at least two first steel stranded wires and at least two second steel stranded wires. At least two of the first steel stranded wires and at least two of the second steel stranded wires are arranged alternately, evenly stranded around the carbon fiber stranded wire, and the diameter of the first steel stranded wire is different from that of the second steel stranded wire.

2. The carbon fiber composite cable according to claim 1, characterized in that, Multiple of the composite stranded wires are stranded by an interlocking method.

3. The carbon fiber composite cable according to claim 1, characterized in that, The composite stranded wire further includes a first protective sleeve, a second protective sleeve, a first positioning sleeve and a second positioning sleeve. Among them, the first protective sleeve is sleeved on the outer wall of the carbon fiber stranded wire; at least two of the first steel stranded wires are evenly stranded between the first protective sleeve and the first positioning sleeve; at least two of the second steel stranded wires are evenly stranded between the first positioning sleeve and the second positioning sleeve; the second protective sleeve is sleeved on the outer wall of the second positioning sleeve.

4. The carbon fiber composite cable according to claim 3, wherein, A fireproof material is provided between the second positioning sleeve and the second protective sleeve.

5. The carbon fiber composite cable according to claim 3, characterized in that, The diameter of the first steel stranded wire is smaller than that of the second steel stranded wire.

6. The carbon fiber composite cable according to claim 1, characterized in that, At least two of the first steel stranded wires and at least two of the second steel stranded wires have the same stranding direction, and the spiral angle of their stranding is set to 0° - 15°.

7. The carbon fiber composite cable according to claim 1, wherein, Both the first steel stranded wire and the second steel stranded wire are set to three.

8. The carbon fiber composite cable according to claim 1, characterized in that, The protective sleeve is sequentially provided with an insulating layer, an anti-corrosion layer and a waterproof layer from the inside out.

9. The carbon fiber composite cable according to claim 8, characterized in that, A buffer layer is provided between the anti-corrosion layer and the waterproof layer.

10. The carbon fiber composite cable according to claim 1, wherein The carbon fiber composite cable further has a maintenance cable, and the maintenance cable is stranded with multiple of the composite stranded wires to form the stranded wire body.

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