Carbon fiber inhaul cable anti-collision device

Abstract

The invention discloses a carbon fiber inhaul cable anti-collision device which comprises an inhaul cable located in the middle and supported by a carbon fiber reinforced composite material, an inner protective layer wrapping the outer surface of the inhaul cable and an outer protective layer wrapping the outer surface of the inner protective layer. The carbon fiber inhaul cable anti-collision device has good durability and is not prone to corrosion and damage, and the durability of the inhaul cable can be further improved.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a carbon fiber cable anti-collision device. Background Technology

[0002] In long-span bridge structures, cable-stayed bridges such as suspension bridges and cable-stayed bridges are widely used due to their beautiful shape, outstanding span capacity and good structural stress performance. However, modern long-span cable-stayed bridges widely use traditional steel cables as their core load-bearing components. Due to insufficient corrosion resistance and heavy weight, steel cables have the following problems in practical engineering applications: (1) They are prone to corrosion and have a short service life. Their service life is usually only about 20 years, which is far from the 100-year design service life of the bridge. This results in the need to replace the cables multiple times during the design service life of the bridge, resulting in huge economic costs; (2) They have a heavy weight and obvious sag effect. The equivalent elastic modulus of steel cables decreases sharply with the increase of the span (for the tail cable of the mid-span of a kilometer-class super-large span cable-stayed bridge, its equivalent elastic modulus can decrease by up to 30%), which leads to a significant reduction in structural load-bearing efficiency and limits the further increase of the bridge span.

[0003] The emergence and application of lightweight, high-strength, corrosion-resistant, and fatigue-resistant carbon fiber reinforced polymers (CFRPs) can fundamentally solve the aforementioned problems. CFRPs are high-performance materials composed of high-performance fibers and a resin matrix, possessing characteristics such as lightweight, high strength, corrosion resistance, excellent fatigue resistance, and high design flexibility. Replacing traditional steel prestressing tendons, bridge hangers, and cables with CFRP bars can fundamentally solve the problem of insufficient structural durability caused by steel corrosion and meet the requirements for lightweight structures. Therefore, it has good application prospects in civil engineering. However, CFRPs exhibit significant transverse anisotropy and brittle elasticity. Their transverse shear strength is much lower than their longitudinal tensile strength (generally not exceeding 10% of their tensile strength), and their failure process shows obvious brittle failure characteristics. The resulting insufficient transverse impact resistance is a key issue of concern for engineers in practical applications.

[0004] As the core load-bearing components of cable-stayed bridges, cables and suspenders are susceptible to lateral impacts from vehicles and falling rocks during service. With increasing traffic volume, vehicle collisions with bridges are becoming increasingly common. Therefore, designing and developing an impact-resistant protection device for carbon fiber cables is urgently needed. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a carbon fiber cable anti-collision device, which has good durability, is not easily corroded or damaged, and further improves the durability of the cable itself.

[0006] The technical solution provided by this invention is as follows: A carbon fiber cable anti-collision device includes a cable located in the middle and supported by carbon fiber reinforced composite material, an inner protective layer covering the outer surface of the cable, and an outer protective layer covering the outer surface of the inner protective layer.

[0007] Preferably, the outer protective layer is made of a wear-resistant, relatively hard, heat-resistant, UV-resistant, and lightweight material.

[0008] Preferably, the outer protective layer is made of one of the following materials: metal pipe, composite material winding layer, polyvinyl chloride or high-density polyethylene pipe, or metamaterial pipe.

[0009] Preferably, when the outer protective layer is a metamaterial tube, the outer protective layer has a honeycomb structure.

[0010] Preferably, the inner protective layer is made of one of the following: a flexible energy-absorbing layer, polyurethane, or a composite material winding layer.

[0011] Preferably, the inner protective layer comprises several separate structures, which are spaced apart according to the probability of the cable being subjected to impact and the weight requirements of the protective system.

[0012] Preferably, the inner protective layer is an integral structure and completely covers the locations where the cable may be impacted along the cable direction.

[0013] Preferably, an adhesive medium is filled between the inner protective layer and the outer protective layer.

[0014] Preferably, the bonding medium is one of lightweight concrete, silicone or epoxy resin.

[0015] The present invention has the following advantages over the prior art: (1) The carbon fiber cable anti-collision device of the present invention has good impact resistance. By selecting materials with good impact energy absorption effect, such as polyurethane, composite materials, metamaterial honeycomb structures, etc., and arranging them into a ring-shaped flexible performance layer, the protection system can have a good impact energy absorption effect. The selection and arrangement of such materials can not only absorb the impact energy input by impacting objects (such as vehicles, falling rocks, etc.), but this flexible material can also delay the impact time and reduce the impact damage to the vehicle and its passengers.

[0016] (2) The carbon fiber cable anti-collision device of the present invention has low cost and low weight gain effect. Due to the limited height of the vehicle, the area of ​​impact on the cable is relatively fixed rather than the entire cable. Therefore, only the area of ​​the cable that may be impacted is protected, and this feature of arranging the annular protective layer at intervals can reduce the amount of protective material used and improve economy. The protective material used has lightweight properties and only protects the area of ​​the cable that may be impacted. Therefore, the weight gain caused by the protective structure is relatively small, which matches the lightweight and high strength properties of CFRP material and reduces the sag effect caused by setting up the protective system.

[0017] (3) The carbon fiber cable anti-collision device of the present invention can improve wind resistance. The protective layer has an inner and outer layer design. The outer layer is mainly used for wear resistance and UV protection. The bonding medium can be injected between the inner and outer layers according to actual needs to adjust the self-weight of the cable, thereby adjusting the natural frequency of the cable and improving the wind resistance of the cable. At the same time, CFRP has weak high temperature resistance, and the presence of the bonding medium can improve the fire resistance of CFRP.

[0018] (4) The carbon fiber cable anti-collision device of the present invention has good repairability and replaceability. In the event of a minor impact, if only the outer protective layer is damaged, the outer protective layer can be repaired and replaced. The outer metal tube, polyvinyl chloride or high-density polyethylene tube, and metamaterial tube are all weldable and easy to replace. If the outer layer is made of composite material winding layer, it is also convenient to directly add winding. In the event of more serious damage, only the damaged inner annular protective layer needs to be replaced and the adhesive medium needs to be added. Therefore, the protective structure has good repairability, simple repair and replacement construction, and low cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the carbon fiber cable anti-collision device in Embodiment 1 of the present invention; Figure 2 for Figure 1 A sectional view along the central axis.

[0021] Figure label: 1. Cable; 2. Inner protective layer; 3. Outer protective layer; 4. Adhesive medium. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] Example 1: like Figure 1 , 2 As shown, an embodiment of the present invention provides a carbon fiber cable anti-collision device, including a cable 1 located in the middle and supported by carbon fiber reinforced composite material, an inner protective layer 2 covering the outer surface of the cable, and an outer protective layer 3 covering the outer surface of the inner protective layer 2.

[0024] In this embodiment, depending on specific engineering requirements, the outer protective layer 3 can be made of a wear-resistant, relatively hard, heat-resistant, UV-resistant, and lightweight material. It comes into direct contact with the impacting object, preventing scratches and resisting its impact, thus reducing the impact load. The outer protective layer 3 is made of metamaterial tubing and has a honeycomb structure, which can be formed through 3D printing.

[0025] In this embodiment, the inner protective layer 2 is made of a flexible energy-absorbing layer. The inner protective layer 2 includes several separate structures, which are spaced apart according to the probability of the cable 1 being subjected to impact and the weight requirements of the protective system, so as to meet the requirements of improving impact resistance and reducing structural weight gain.

[0026] In this embodiment, an adhesive medium 4 is filled between the inner protective layer 2 and the outer protective layer 3. The adhesive medium 4 ensures the overall stress characteristics of the inner protective layer 2 and the outer protective layer 3 and diffuses impact loads. The adhesive medium 4 is composed of a material with good fluidity, such as lightweight concrete, silicone, or epoxy resin. Alternatively, the adhesive medium 4 can be omitted depending on actual needs. The presence of the adhesive medium 4 not only improves the overall impact resistance of the cable 1 but also further enhances the durability of the cable 1 structure.

[0027] Example 2: The difference between this embodiment and Embodiment 1 is that the outer protective layer 3 is made of a metal tube (which can be a metal tube composed of aluminum film + polyurethane + honeycomb aluminum, or a pure metal tube, such as a copper tube or a stainless steel tube). The entire outer protective layer 3 is formed by welding, and the inner protective layer 2 is made of polyurethane. The rest of the structure is the same as in the embodiment.

[0028] Example 3: The difference between this embodiment and embodiment 1 is that the outer protective layer 3 is made of composite material winding layer. The outer protective layer 3 can be formed by winding after impregnating the composite material with resin. At this time, the fiber winding direction of the outer protective layer 3 can be designed according to the direction of external impact, and it has designability. The inner protective layer 2 is also made of composite material winding layer, and the rest of the structure is the same as in the embodiment.

[0029] Example 4: The difference between this embodiment and Embodiment 1 is that the outer protective layer 3 is made of polyvinyl chloride or high-density polyethylene pipe. When making the cable, polyvinyl chloride or polyethylene is directly pultruded. The inner protective layer 2 is also made of composite material winding layer. The rest of the structure is the same as in the embodiment.

[0030] Example 5: The difference between this embodiment and embodiment 1 is that the inner protective layer 2 is an integral structure and completely covers the location where the cable 1 may be impacted along the direction of the cable 1. The rest of the structure is the same as in the embodiment.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbon fiber cable anti-collision device, characterized in that, It includes a cable (1) located in the middle and supported by carbon fiber reinforced composite material, an inner protective layer (2) covering the outer surface of the cable (1), and an outer protective layer (3) covering the outer surface of the inner protective layer (2).

2. The carbon fiber cable anti-collision device according to claim 1, characterized in that, The outer protective layer (3) is made of wear-resistant, hard, heat-resistant, UV-resistant, and lightweight material.

3. The carbon fiber cable anti-collision device according to claim 2, characterized in that, The outer protective layer (3) is made of one of the following materials: metal pipe, composite material winding layer, polyvinyl chloride or high-density polyethylene pipe, or metamaterial pipe.

4. The carbon fiber cable anti-collision device according to claim 3, characterized in that, When the outer protective layer (3) is a metamaterial tube, the outer protective layer has a honeycomb structure.

5. The carbon fiber cable anti-collision device according to claim 1, 2, 3, or 4, characterized in that, The inner protective layer (2) is made of one of the following: a flexible energy-absorbing layer, polyurethane, or a composite material winding layer.

6. The carbon fiber cable anti-collision device according to claim 5, characterized in that, The inner protective layer (2) includes several split structures, which are spaced apart according to the probability of the cable being impacted and the weight requirements of the protective system.

7. The carbon fiber cable anti-collision device according to claim 5, characterized in that, The inner protective layer (2) is an integral structure and covers the entire cable direction at the locations where the cable (1) may be impacted.

8. The carbon fiber cable anti-collision device according to claim 1, 2, 3, or 4, characterized in that, An adhesive medium (4) is filled between the inner protective layer (2) and the outer protective layer (3).

9. The carbon fiber cable anti-collision device according to claim 8, characterized in that, The bonding medium (4) is one of lightweight concrete, silicone or epoxy resin.

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