Hanging anti-ice shading structure device for surface of stay cable

Abstract

The utility model relates to a hanging anti-ice shading structure device for the surface of a stay cable, which comprises a smooth stay cable, a hanging cable coat is wrapped outside the smooth stay cable, a bonding buffer layer is arranged between the smooth stay cable and the hanging cable coat, and a plurality of bulge units are arranged on the surface of the hanging cable coat at intervals. The smooth stay cable is a steel strand assembly formed by a plurality of twisted steel strands, and the steel strand assembly is wrapped with a cable hoop. The device can replace traditional wind vibration resistance measures such as a damper and an auxiliary cable under the ice-free working condition, ice control and wind vibration suppression are synchronously achieved under the freezing rain weather, the comprehensive operation and maintenance cost of the whole life cycle is reduced, and a zero-energy-consumption double-function innovative scheme is provided for stay cable protection.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, and more specifically, to a hanging anti-icing textured structure device for the surface of cable stays. Background Technology

[0002] Cable-stayed bridges are one of the main load-bearing components, highly susceptible to large-amplitude vibrations under wind conditions. Common vibration types include vortex-induced vibration, wind-induced vibration, and wake-induced vibration. As long-span cable-stayed bridges develop towards greater height and length, the slenderness ratio of the cables is constantly increasing. Their low damping and high flexibility lead to increasingly prominent wind-induced vibration problems. In areas like the Yangtze River basin and the Yunnan-Guizhou Plateau, where strong convection between cold and warm, humid air currents occurs, freezing rain easily freezes on the cables, forming an irregularly shaped layer of ice. This ice accumulation increases the load on the cables and alters their aerodynamic shape and characteristics. Under wind loads, this can cause wind-induced vibrations, affecting bridge safety. The design of long-span cable-stayed bridges often places some cables at heights exceeding 100 meters, where freezing rain and even icing can pose a significant threat to traffic safety below. In freezing rain, a thin film of water forms on the wet surface of cable stays. As rainfall increases, gravity causes water to flow downwards along the cable surface, converging at the bottom and forming continuous water lines. This water can then condense into long icicles, threatening bridge safety. Current technologies often employ spiral or recessed structures to suppress wind-induced vibration, but these methods struggle to simultaneously address both icing prevention and wind-induced vibration control.

[0003] Traditional spiral structures, such as Chinese patents CN212294315U and CN202626832U, can segment ice layers, but the single linear protrusions easily lead to water flow convergence, which in turn promotes the formation of larger icicles in certain areas. While the bidirectional spiral grooves in CN202208888U improve wind vibration, the grooves easily accumulate water, exacerbating freezing. Meanwhile, CN214783277U uses electric heating for ice melting, but it is energy-intensive and dependent on external power sources. Existing cable-stayed bridges suffer from a disconnect between anti-icing and wind vibration control, complex de-icing methods, and difficulty in controlling icicle growth. Existing spiral / rib solutions, such as CN206611143U, use bidirectional spiral protrusions to suppress wind vibration, but due to the long pitch, they are not effective at segmenting water lines. The high spiral rib design in CN211057614U, with spiral ribs along the cylindrical surface, provides a long-range adhesive force at the bottom of the icicle, making it difficult for the icicle to detach automatically. Existing anti-icing devices applied to the surface of stay cables, such as CN219604136U, require external mounting or mechanical fastening. Prolonged exposure to wind and rain can lead to bolt corrosion or structural detachment, resulting in protective failure. While existing hydrophobic coatings can temporarily reduce droplet adhesion, these coatings are prone to peeling under environmental stresses such as ultraviolet radiation and freeze-thaw cycles, requiring regular recoating. Furthermore, working on stay cables at heights is difficult and maintenance costs are high. Active heating devices, such as the cable spiral heating systems CN214783277U and CN219637689U, and the air heating device CN110747740B, require continuous power and rely on temperature sensors, and the heating elements have a high failure rate. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a hanging anti-icing pattern structure device for the surface of cable stays, which can replace traditional anti-wind vibration measures such as dampers and auxiliary cables in ice-free conditions, and simultaneously achieve ice control and wind vibration suppression in freezing rain weather.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a hanging anti-icing bottom texture structure device for the surface of a cable-stayed bridge, including a smooth cable-stayed bridge, the smooth cable-stayed bridge being wrapped with a hanging cable sheath, an adhesive buffer layer being provided between the smooth cable-stayed bridge and the hanging cable sheath, and multiple protruding units being provided at intervals on the surface of the hanging cable sheath.

[0006] According to the above scheme, the smooth cable is a steel strand assembly formed by multiple twisted steel strands, and the steel strand assembly is wrapped with cable hoops.

[0007] According to the above scheme, the steel strand includes steel wires, a protective tube, and grease. Multiple steel wires are twisted together to form a whole and then wrapped with a protective tube. Grease is placed in the gaps between the multiple twisted steel wires.

[0008] According to the above scheme, the adhesive buffer layer is made of rubber elastomer with a thickness of 3–5 mm.

[0009] According to the above scheme, the hanging cable C is a protective tube made of high-density polyethylene material, and the thickness of the protective tube is ≥6mm.

[0010] According to the above scheme, the protruding unit is disposed on the surface of the hanging cable, the axial distance between adjacent protruding units is 100-150mm and they are distributed in a spiral pattern, and the spiral distance between adjacent protruding units is 4-6 times the diameter of the cable.

[0011] According to the above scheme, the protruding unit includes an arc-shaped water-blocking plate, which is fixedly installed on the surface of the hanging cable garment. The arc-shaped water-blocking plate has a parabolic slope with a uniformly varying inclination angle on the radially symmetrical plane of the hanging cable garment surface. The water-blocking plate forms a concave water groove with a parabolic transition along the surface of the hanging cable garment towards the waterline.

[0012] According to the above scheme, the height of the water-blocking plate E is 5-10mm, and the width of the concave water tank F is 30-50mm.

[0013] According to the above scheme, a sharp edge is formed by cutting the top of the water-blocking plate E.

[0014] According to the above scheme, the radius of curvature of the top sharp edge is ≤0.1mm.

[0015] The anti-icing textured structure device for hanging on the surface of cable stays, which implements this utility model, has the following characteristics:

[0016] Beneficial effects:

[0017] 1. This utility model achieves significant technical effects in anti-icing, wind vibration resistance, and durability through innovative surface structure design and material process integration: Under the extreme conditions of freezing rain in winter, the freezing rain flows down the cable under the action of gravity, and quickly reaches the dripping condition after being collected by the inclined collection of the surface protrusion structure, which shortens the residence time of the freezing rain and greatly reduces the amount of freezing rain retained on the surface of the cable. Through the process of blocking water lines, collecting freezing rain, accelerating detachment, inducing ice formation, and automatic de-icing, the goal of controlling the damage of ice in freezing rain weather and optimizing the wind vibration resistance performance of the cable under ice-free conditions is achieved.

[0018] 2. This utility model artificially increases water collection points and divides continuous water lines by using spirally distributed protruding units to induce the formation of ice floes. The number of ice floes increases, and the average length and mass of ice floes are reduced compared to smooth circular cables, completely eliminating the risk of large-volume ice floes falling. At the same time, the sharp-edge design utilizes temperature fluctuations to form stress concentration points at the ice-cable contact point, reducing the contact area to increase the local detachment force. During the ice layer expansion-contraction cycle, the accumulated ice detaches.

[0019] 3. This utility model uses an outer cable sheath made of one-piece molded high-density polyethylene material, which greatly reduces the operation and maintenance cost throughout the entire life cycle and avoids the disadvantages of poor overall integrity, poor durability and high energy consumption compared with traditional solutions. The raised structure on the surface discretizes the vortex shedding frequency, reduces the amplitude within a certain wind speed range, increases the critical wind speed for wind and rain excitation, and organically unifies wind vibration suppression and long-term reliability, providing a new solution for wind resistance of bridge cable stays. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the anti-icing textured structure device for hanging on the surface of cable stays according to this utility model;

[0022] Figure 2 This is a structural schematic diagram of the hanging cable garment of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the lower surface of the hanging cable garment of this utility model;

[0024] Figure 4 This is a schematic diagram of the spiral arrangement of the protruding units of this utility model;

[0025] Figure 5 This is a partial schematic diagram of the protruding unit structure of this utility model;

[0026] Figure 6 This is a schematic diagram of the overall structure of the protruding unit of this utility model;

[0027] Figure 7 This is a cross-sectional view of the overall cable of this utility model;

[0028] Figure 8 This is a cross-sectional view of the steel wire in this utility model.

[0029] In the diagram: 1. Smooth cable; 2. Bonded buffer layer; 3. Hanging cable sheath; 4. Raised unit; 5. Water-blocking plate; 6. Concave water trough; 7. Top sharp edge; 8. Cable hoop; 9. Steel strand; 901. Steel wire; 902. Protective pipe; 903. Grease. Detailed Implementation

[0030] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] like Figure 1-8As shown, the present invention provides a hanging anti-icing textured structure device for the surface of a stay cable, comprising a smooth stay cable 1, an hanging cable cover 3 wrapped around the smooth stay cable 1, an adhesive buffer layer 2 between the smooth stay cable 1 and the hanging cable cover 3, and multiple raised units 4 spaced apart on the surface of the hanging cable cover 3.

[0032] The smooth cable-stayed cable 1 is composed of multiple steel strands 9 bundled together and bound, then slightly twisted to form a cable body. A high-strength polyester fiber tape is wrapped around the outer layer for fixation, and finally a protective layer is applied to form a smooth outer surface. The smooth cable-stayed cable 1 is a steel strand assembly formed by multiple twisted steel strands 9, with a cable clamp 8 wrapped around the outside. Each steel strand 9 includes a steel wire 901, a sheath 902, and grease 903. Multiple steel wires 901 are twisted together to form a whole and then wrapped with a sheath 901. Grease 903 is placed in the gaps between the twisted steel wires 901.

[0033] A bonding buffer layer 2, approximately 3–5 mm thick, made of rubber elastomer, is installed between the smooth cable 1 and the sheath 3. The sheath 3 is a protective tube made of high-density polyethylene (HDPE). The HDPE sheath has a relatively weak physical bond with the surface of the smooth cable 1; direct contact could lead to interface delamination due to differences in thermal expansion and contraction, forming cavities and accumulating moisture. Simultaneously, the bonding buffer layer 2 blocks moisture penetration, preventing electrochemical corrosion of the smooth cable 1 when exposed to a humid environment. Furthermore, the bonding buffer layer 2 absorbs stress caused by cable vibration and temperature deformation, mitigating the risk of fatigue cracking of the HDPE sheath due to periodic vibrations under wind loads.

[0034] The cable sheath 3 is prefabricated in the factory using HDPE, and its complex protruding structure is precisely formed through thermoforming. According to the "Design Specifications for Highway Cable-Stayed Bridges" (JTG / TD65-01), the HDPE sheath thickness must be ≥6mm. Using HDPE enables the cable sheath 3 to possess high surface hardness, tensile strength, and rigidity, while maintaining toughness at low temperatures to cope with the special conditions of cable swaying during freezing rain. HDPE has a specific gravity of only 0.941-0.960, lighter than metals or ceramics, and the cable sheath 3, placed on the smooth surface of the cable 1, will not impose a significant additional load on the cable. HDPE requires no complex pretreatment, making it suitable for large-scale production of low-cost protruding structure products. It has low processing costs and is 100% recyclable, aligning with environmentally friendly construction principles.

[0035] The surface of the hanging cable 3 is spirally equipped with raised units 4, with an axial spacing of 100-150mm. The spiral spacing can be adjusted according to the estimated rainfall and annual average wind speed. The raised units 4 on the surface of the cable typically only need to be arranged in the area where the water line converges. The specific arrangement range is set according to the estimated rainfall and annual average wind speed. By combining the characteristics of the spiral spacing and the height of the raised units, the wind and rain excitation of the vibration damping cable and the galloping of the dry cable can be further suppressed.

[0036] The spirally distributed raised units 4 physically block water flow, segmenting the waterline on the cable-stayed bridge surface and shortening its length, thus preventing freezing rain from accumulating on the lower surface of the cable-stayed bridge and forming long strips of ice. The raised units 4 include arc-shaped water-blocking plates 5, each 5-10mm high. These plates form a parabolic slope with a uniformly varying inclination angle vertically to the cable-stayed bridge surface. Water-blocking plates that are too short have limited effect on segmenting the waterline, easily causing the waterline to cross the plate and form a continuous waterline with the water flow behind it. The varying inclination angle of the slope minimizes velocity loss during the change of water flow direction, gradually transitioning the water flow velocity direction from parallel to the cable-stayed bridge surface to at a certain angle away from it. The water-blocking plates 5 form a concave water channel 6 along the upward waterline direction on the cable-stayed bridge surface, with a parabolic transition and a width of 30-50mm, causing water flow within the lateral width to converge into the concave water channel 6. At the tip of the water-blocking plate 5, there is a top cut to form a top sharp edge 7. The edge curvature radius of the top sharp edge 7 is ≤0.1mm. The sudden change in surface shape reduces the adhesion of water on the cable surface and accelerates the water flow.

[0037] The process of anti-icing and shock absorption function taking effect:

[0038] In low-temperature freezing rain weather, water flow on the surface of the cable stays accelerates down the cable stays under the action of gravity until it encounters a water-blocking plate 5. The collision force causes the water flow direction to change along the direction of the water-blocking plate 5. Guided by the water-blocking plate 5, the water flow direction converges at the concave water trough 6, increasing the water film thickness and contact angle. This allows the surface water flow to reach the critical detachment condition more quickly under the action of gravity. The water flow tip reaches the top sharp edge 7. Due to the small radius of curvature of the edge, a tiny "cliff" is formed, causing the external force for water flow detachment to exceed the contact line pinning force, reaching the critical detachment condition, and the water drips off. Multiple protruding units 4 work together to block the formation of continuous water lines on the surface of the cable stays, shortening the length of a single water line.

[0039] The water remaining on the cable surface exchanges heat with the cable and air. The thinner water film preferentially condenses into ice. After ice has adhered to the surfaces of the cable sheath 3 and the raised unit 4, the function of the raised unit 4 weakens. The water film at the concave water groove 6 in each raised unit 4 remains relatively thick, and the condensation process continues, forming tiny ice growth points dispersed on the lower surface of the cable and gradually developing. At the same time, due to the different material properties of the sharp edge 7 and the ice covering its surface, and the smaller radius of curvature of the edge, stress concentration easily occurs at the contact point between the ice and the sharp edge 7 during temperature fluctuations. The bottom surface of the ice warps at this point, reducing the surface area for ice adhesion and causing the surface ice to automatically peel off after reaching a certain size. In this way, even if small ice fragments of short length and weight fall from the surface of the cable, they will not cause serious damage to the bridge deck or vehicles and pedestrians traveling on the bridge.

[0040] Under certain wind speed and lateral wind conditions, the spirally distributed protruding units 4 on the surface of the cable-stayed cable cause the spanwise wind load of the cable-stayed cable to generate three-dimensionality at the separation point, change the position of the separation point, accelerate the transition from laminar to turbulent flow, advance the critical zone, suppress the periodically changing aerodynamic forces generated on the smooth cable-stayed cable 1, and at the same time, the aforementioned protruding units 4 disrupt the continuity of the waterline, thereby effectively suppressing the vortex-induced vibration and wind and rain-induced vibration phenomena of the cable-stayed cable.

[0041] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A device for hanging an anti-icing bottom structure on the surface of a stay cable, characterized in that, It includes a smooth stay cable, the smooth stay cable is wrapped with a hanging cable sheath, an adhesive buffer layer is provided between the smooth stay cable and the hanging cable sheath, and multiple protruding units are provided at intervals on the surface of the hanging cable sheath.

2. The device for hanging anti-icing bottom structure on the surface of stay cable according to claim 1, characterized in that, The smooth cable-stayed cable is a steel strand assembly formed by multiple twisted steel strands, and the steel strand assembly is wrapped with cable hoops.

3. The device for hanging anti-icing bottom structure on the surface of stay cable according to claim 2, characterized in that, The steel strand includes steel wires, a protective tube, and grease. Multiple steel wires are twisted together to form a whole and then wrapped with a protective tube. Grease is placed in the gaps between the multiple twisted steel wires.

4. The device for hanging anti-icing bottom structure on the surface of stay cable according to claim 1, characterized in that, The adhesive buffer layer is made of rubber elastomer and has a thickness of 3–5 mm.

5. The device for hanging anti-icing bottom structure on the surface of stay cable according to claim 1, characterized in that, The hanging cable sleeve C is a protective tube made of high-density polyethylene material, and the thickness of the protective tube is ≥6mm.

6. The device for installing anti-icing grooves on the surface of a stay cable according to claim 1, wherein The protruding units are disposed on the surface of the hanging cable, and the axial spacing between adjacent protruding units is 100-150mm and they are distributed in a spiral pattern. The spiral spacing between adjacent protruding units is 4-6 times the diameter of the cable.

7. The device for hanging anti-icing grooving structure on the surface of a stay cable according to claim 6, characterized in that, The raised unit includes an arc-shaped water-blocking plate, which is fixedly installed on the surface of the hanging cable. The arc-shaped water-blocking plate is provided with a parabolic slope with a uniformly changing inclination angle on the radially symmetrical plane of the hanging cable surface. The water-blocking plate forms a concave water groove with a parabolic transition along the upward waterline direction of the hanging cable surface.

8. The anti-icing textured structure device for the surface of a cable-stayed bridge according to claim 7, characterized in that, The height of the water-blocking plate E is 5-10mm, and the width of the concave water trough F is 30-50mm.

9. The device for hanging anti-icing grooving structure on the surface of stay cable according to claim 7, characterized in that, The tip of the water-blocking plate E is provided with a top cut to form a sharp edge.

10. The device for hanging anti-icing grooving structure on the surface of stay cable according to claim 9, characterized in that, The radius of curvature of the top sharp edge is ≤0.1mm.

Images