Bridge cable capable of quickly judging damage condition after fire and manufacturing method

Abstract

The invention discloses a bridge cable capable of rapidly judging the damage condition after a fire and a manufacturing method, the cable comprises a basic element (1) of the bridge cable and at least one low-melting-point alloy wire (2) serving as a high-temperature indicator, in a main cable of a suspension bridge, the basic element (1) comprises a high-strength steel wire strand (11), and the high-strength steel wire strand (11) is connected with the high-strength steel wire strand (11). S-shaped or circular wrapping wires (12) are arranged on the outer sides of the high-strength steel wire strands (11), and a main cable outer wrapping protective layer (13) is arranged on the outer sides of the wrapping wires (12); in a sling and a stay cable, the basic element (1) comprises a semi-parallel high-strength steel wire bundle (14), and a polyethylene sheath (15) is arranged on the outer side of the semi-parallel high-strength steel wire bundle (14). According to the bridge cable, the low-melting-point alloy wire (2) with the appropriate melting point is integrated into a fire-prone area of the cable, the cable slightly affected by a disaster can be rapidly removed through the appearance of the low-melting-point alloy wire (2), and the cable is not prone to fire disaster; the post-disaster detection efficiency is improved, and the post-fire bridge safety assessment time is greatly shortened.

Description

Technical Field

[0001] The present invention belongs to the field of bridge cable structures, and more specifically, relates to a bridge cable capable of quickly judging damage after a fire and a manufacturing method thereof. Background Art

[0002] Cables composed of high-strength steel wires, including main cables, suspenders, stay cables, limit cables, etc., are important components of long-span suspension bridges and cable-stayed bridges, and have a significant impact on bridge safety. In addition to material fatigue and corrosion accumulated during long-term operation, fire is a common, sudden, and unpredictable disaster. Although the bridge cables themselves are made of non-flammable or flame-retardant materials, if a vehicle, especially a tanker or other flammable material transport vehicle, catches fire on the bridge, it may cause the cable to continue to be burned, the temperature of the high-strength steel wire to rise, and the performance to degrade, posing a threat to the safe operation of the bridge.

[0003] It is generally believed that the performance of high-strength steel wires that constitute bridge cables does not decay significantly in high-temperature environments below 350°C. However, after being exposed to an environment above 350°C, the bearing capacity and stiffness will drop significantly as the temperature rises, which may cause safety problems for cable components. The research and development of cable fire protection methods tends to be safe, with the threshold of controlling the steel wire temperature not exceeding 300°C.

[0004] Once a fire occurs on a cable-supported bridge, it is essential to conduct safety inspections on the affected components after the disaster. There have been many studies on the performance changes of high-strength steel wires after experiencing high temperatures, but fires on bridges are accidental, and it is difficult to determine whether the temperature of the cable in a fire exceeds the threshold of 300°C. If sampling tests are conducted on bridge steel wires, although the safety reserve of the steel wires can be accurately determined, the time and cost of construction and testing are high, especially for the main cables of suspension bridges. The steel wire strands are wrapped with round or S-shaped wire wraps, which play an important role in maintaining the cross-sectional shape of the main cable and preventing corrosion. Special equipment is required for wrapping and tightening. If the wire wraps are removed without discrimination and sampling is performed, it is easy to increase construction time and testing costs. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a bridge cable and a manufacturing method that can quickly determine the damage after a fire. By integrating a low-melting point alloy wire with a suitable melting point into the cable's fire-prone area, the cable with slight damage (ambient temperature below 300°C) can be quickly excluded through the appearance of the low-melting point alloy wire, thereby improving the efficiency of post-disaster detection and greatly shortening the time for bridge safety assessment after a fire. By timely and accurately determining the damage caused by the fire, the damaged cable components can be discovered and repaired in a timely manner, thereby ensuring the overall safety and stability of the bridge structure, helping to reduce disaster losses, and improving the efficiency and effectiveness of emergency response. For cable components where the low-melting point alloy wire has not been melted, further sampling and testing can be avoided, thereby saving expensive testing costs. At the same time, social costs such as traffic closures that may be caused by sampling operations are avoided, and the efficiency and speed of bridge recovery after a fire are improved; since stripping off the damaged wrapping and sheathing and replacing and repairing them is a standard process for the treatment of bridge cables after a fire, the use of this cable will not increase additional construction costs.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present invention, there is provided a bridge cable capable of quickly judging the damage after a fire, comprising a basic element of the bridge cable and at least one low-melting-point alloy wire as a high-temperature indicator, for quickly judging the damage of the cable after a fire;

[0007] The low melting point alloy wire is made of lead-tin-antimony alloy, with a melting point of 280°C to 300°C, and its formula can be any of the following:

[0008] Contains 15% tin, 81% lead, 3% antimony, and 1% others.

[0009] Contains 12% tin, 85% lead, 3% antimony, and 1% others.

[0010] Contains 10% tin, 86% lead, 3% antimony, and 1% others.

[0011] Contains 8% tin, 87% lead, 3% antimony, and 2% others.

[0012] Contains 6% tin, 89% lead, 3% antimony and other 2%.

[0013] Furthermore, in the main cable of the suspension bridge, the basic element comprises a high-strength steel wire strand, an S-shaped or circular winding wire is arranged on the outside of the high-strength steel wire strand, and a main cable outer protective layer is arranged on the outside of the winding wire.

[0014] Furthermore, in the sling and the stay cable, the basic element comprises a semi-parallel high-strength steel wire bundle, and a polyethylene sheath is provided on the outer side of the semi-parallel high-strength steel wire bundle.

[0015] Furthermore, the low melting point alloy wire is arranged on the outside of the winding wire on the main cable of the suspension bridge, and is spirally wound on the cable body, and the spacing of the spiral winding is not greater than 50 cm.

[0016] Furthermore, the low melting point alloy wire is arranged between the semi-parallel high-strength steel wire bundle and the polyethylene sheath on the sling and the inclined cable.

[0017] Furthermore, the low melting point alloy wire should be twisted into strands with semi-parallel high-strength steel wire bundles on the slings and inclined cables, and the polyethylene sheath should be installed together.

[0018] Furthermore, the installation range of the low-melting-point alloy wire on the bridge cable can be determined according to the area of ​​the bridge cable at risk of being affected by fire, so that the low-melting-point alloy wire is installed within a range of not less than 30m from the bridge deck.

[0019] Furthermore, if the low-melting-point alloy wire is not installed in every direction of the sling and the inclined cable, obvious marks should be made on the surface of the cable body after the polyethylene sheath is installed. When installing the sling and the inclined cable, ensure that the surface where the low-melting-point alloy wire is installed faces the lane. If the bridge adopts a central cable surface layout, the low-melting-point alloy wire should be installed in the direction facing the lanes on both sides.

[0020] Furthermore, in the same component, a variety of low-melting-point alloy wires with different melting points can be configured to indicate the maximum temperature that the cable can withstand in a fire.

[0021] According to a second aspect of the present invention, there is provided a method for manufacturing a bridge cable capable of quickly determining damage after a fire, the method comprising:

[0022] S100: According to the design requirements of the bridge cable, select an appropriate low-melting-point alloy wire formula, such as lead-tin-antimony alloy, and determine its melting point range is 280℃~300℃, prepare the low-melting-point alloy wire, and ensure that its diameter, length and other specifications meet the design requirements;

[0023] S200: manufacture basic components of bridge cables, including high-strength steel wire strands, semi-parallel high-strength steel wire bundles, wire wrapping, main cable outer protective layer and polyethylene sheath. According to the specific requirements of suspension bridge main cables or suspenders and inclined cables, the basic components are assembled and pre-processed;

[0024] S300: For the main cable of the suspension bridge, the low-melting alloy wire is spirally wound outside the S-shaped or circular winding layer. The spacing can be set as needed, such as 50cm. For the sling and inclined cable, the low-melting alloy wire and the semi-parallel high-strength steel wire bundle are arranged into strands to ensure that the installation position of the low-melting alloy wire can accurately reflect the maximum temperature that the cable may withstand in a fire;

[0025] S400: After the low-melting-point alloy wire is installed, an anti-corrosion sealing system consisting of anti-corrosion paint, sealant, topcoat, wrapping tape, etc. is applied to the surface of the main cable of the suspension bridge; polyethylene sheath is installed for the sling and inclined cable;

[0026] S500: Conduct quality inspection on manufactured bridge cables, including melting point test of low-melting-point alloy wire and overall strength test of cables, to ensure that bridge cables meet design requirements and have the ability to quickly determine damage after a fire.

[0027] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0028] 1. The bridge cable of the present invention integrates low-melting-point alloy wires with suitable melting points into the cable areas susceptible to fire. The cables with minor damage can be quickly excluded through the appearance of the low-melting-point alloy wires, thereby improving the efficiency of post-disaster detection and greatly shortening the time for bridge safety assessment after a fire. By timely and accurately judging the fire damage, damaged cable components can be discovered and repaired in a timely manner, thereby ensuring the overall safety and stability of the bridge structure, helping to reduce disaster losses and improve the efficiency and effectiveness of emergency response.

[0029] 2. The bridge cable of the present invention can avoid further sampling and testing for cable components where the low-melting-point alloy wire has not melted, thereby saving expensive testing costs. At the same time, it avoids social costs such as traffic closures that may be caused by sampling operations, improves the efficiency and speed of bridge recovery after fire, and allows the bridge to resume normal use more quickly.

[0030] 3. For the bridge cable of the present invention, since stripping off the damaged wrapping and sheath and replacing and repairing them is the standard procedure for post-fire treatment of bridge cables, when the cable is repaired using specific technology, it can not only effectively restore the functionality and safety of the cable, but also save construction costs and improve construction efficiency. At the same time, it can also ensure the overall performance and durability of the cable, which is of great significance for ensuring the safe operation of bridges, improving traffic efficiency and reducing social and economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of a main cable structure of a bridge cable capable of quickly determining damage after a fire according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the installation area of ​​low-melting-point alloy wires of the main cable and suspension cable of a bridge cable that can quickly determine the damage after a fire according to an embodiment of the present invention;

[0033] Figure 3This is a schematic diagram of the structure of the suspension cable and the inclined cable of a bridge cable that can quickly determine the damage after a fire according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the installation area of ​​the low-melting-point alloy wire of the inclined cable of a bridge cable that can quickly determine the damage after a fire according to an embodiment of the present invention;

[0035] Figure 5 The present invention is a flow chart of a method for manufacturing a bridge cable capable of quickly determining damage after a fire.

[0036] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-basic element, 11-high-strength steel wire strand, 12-wrapped wire, 13-main cable outer protective layer, 14-semi-parallel high-strength steel wire bundle, 15-polyethylene sheath, 2-low-melting-point alloy wire. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0041] Example 1

[0042] like Figure 1-4 As shown, an embodiment of the present invention provides a bridge cable that can quickly determine the damage after a fire, including a basic element 1 of the bridge cable and at least one low-melting-point alloy wire 2 as a high-temperature indicator, which is used to quickly determine the damage of the cable after a fire;

[0043] The low melting point alloy wire 2 is made of lead-tin-antimony alloy, with a melting point of 280°C to 300°C, and its formula can be any of the following:

[0044] Contains 15% tin, 81% lead, 3% antimony, and 1% others.

[0045] Contains 12% tin, 85% lead, 3% antimony, and 1% others.

[0046] Contains 10% tin, 86% lead, 3% antimony, and 1% others.

[0047] Contains 8% tin, 87% lead, 3% antimony, and 2% others.

[0048] Contains 6% tin, 89% lead, 3% antimony and other 2%.

[0049] Depending on the environment, different mix ratios are selected to ensure that in the event of a fire, when the temperature exceeds this threshold, the low melting point alloy wire 2 can melt, thereby providing a visual indication that the cable may have been damaged.

[0050] Low-melting-point alloy wires 2 with other melting points can also be configured as needed according to the requirements of bridge cable defense, and multiple low-melting-point alloy wires with different melting points can be configured in the same component to mark the maximum temperature that the cable can withstand in a fire.

[0051] Example 2

[0052] The embodiment of the present invention provides a bridge cable which can quickly judge the damage after a fire, and is applicable to the main cable of a suspension bridge.

[0053] like Figure 1-2As shown, an embodiment of the present invention provides a bridge cable that can quickly determine the damage after a fire, including a basic element 1 and a low-melting-point alloy wire 2, wherein the basic element 1 includes a high-strength steel wire strand 11, and an S-shaped or round winding wire 12 is arranged on the outside of the high-strength steel wire strand 11, and no gaps are left between the winding wires to form a smooth surface, which can effectively block the invasion of rainwater and fog condensation water, slow down the corrosion of the medium on the main cable of the suspension bridge, and extend the service life of the main cable of the suspension bridge. After the S-shaped or round winding wire 12 is wound on the surface of the main cable of the suspension bridge, the structural strength of the main cable can be enhanced, and the low-melting-point alloy wire 2 is arranged on the outside of the winding wire 12 on the main cable of the suspension bridge, and the low-melting-point alloy wire 2 is arranged on the outside of the winding wire 12 on the main cable of the suspension bridge, and is spirally wound on the cable body, and the spacing of the spiral winding is not Greater than 50cm, a main cable outer protective layer 13 is provided on the outside of the low-melting point alloy wire 2, and the main cable outer protective layer 13 is an anti-corrosion sealing system composed of anti-corrosion paint, sealant, topcoat, wrapping tape, etc.; the low-melting point alloy wire 2 is spirally wound on the outside of the winding wire 3 at a certain interval. This winding method not only reduces the construction time, but also reduces the construction difficulty, because the construction personnel do not need to perform fine and tight winding work like dealing with traditional winding wires, and the spiral winding method can still enhance the structural stability of the main cable to a certain extent. After the low-melting point alloy wire 2 is installed, a main cable outer protective layer 13 will be applied to its surface, which can effectively isolate moisture, oxygen and other corrosive substances in the external environment, thereby extending the service life of the main cable.

[0054] like Figure 2 As shown, the winding range of the low-melting-point alloy wire 2 on the main cable of the suspension bridge can be determined according to the area where the main cable of the bridge is at risk of being affected by fire. The general value is to install the low-melting-point alloy wire within a range of not less than 30m from the bridge deck. Once a fire occurs, these low-melting-point alloy wires 2 will melt first due to their lower melting point, thereby quickly identifying the area affected by the fire, providing an important basis for post-fire damage assessment and repair. By limiting the installation range of the low-melting-point alloy wire 2, it is possible to optimize the use of resources and reduce unnecessary material waste while ensuring safety.

[0055] Example 3

[0056] The embodiment of the present invention provides a bridge cable that can quickly determine the damage after a fire, and is suitable for suspension cables and inclined cables.

[0057] like Figure 3As shown, an embodiment of the present invention provides a bridge cable that can quickly determine the damage after a fire, including a basic element 1 and a low-melting-point alloy wire 2, wherein the basic element 1 includes a semi-parallel high-strength steel wire bundle 14, and a low-melting-point alloy wire 2 is arranged on the outside of the semi-parallel high-strength steel wire bundle 14. The low-melting-point alloy wire 2 can be made of an alloy with a diameter of not less than 3 mm, and is twisted with the semi-parallel high-strength steel wire bundle 14 to form a cable strand, and a polyethylene sheath 15 is arranged on the outside of the low-melting-point alloy wire 2. The polyethylene sheath 15 provides protection for the semi-parallel high-strength steel wire bundle 14, prevents the intrusion of external moisture and other harmful substances, and can extend the service life of the cable. In order to extend the service life, if the low-melting point alloy wire 2 is not installed in every direction of the suspension bridge sling and the cable-stayed bridge inclined cable, the installation position of the low-melting point alloy wire 2 should be marked on the cable body surface after the polyethylene sheath 15 is installed. When installing the sling and inclined cable, ensure that the surface with the low-melting point alloy wire 2 is facing the driveway. This ensures that when a fire occurs, the area affected by the fire can be quickly identified, the degree of damage to the cable after the fire can be assessed, and the part of the cable that needs to be repaired or replaced can be determined. The low-melting point alloy wire 2 is twisted into a cable strand with the high-strength steel wire 1, and the polyethylene sheath 15 is installed together. This structure can enhance the corrosion resistance of the cable.

[0058] like Figure 2 and Figure 4 As shown, the setting range of the low-melting point alloy wire 2 on the sling and the cable-stayed bridge can be determined according to the area where the main cable of the bridge is at risk of being affected by fire. The general value is that the low-melting point alloy wire 2 is installed within a range of not less than 30m from the bridge deck. Once a fire occurs, these low-melting point alloy wires 2 will melt first due to their low melting point, thereby quickly identifying the area affected by the fire, providing an important basis for post-fire damage assessment and repair. By limiting the installation range of the low-melting point alloy wire 2, it is possible to optimize the use of resources and reduce unnecessary material waste while ensuring safety. If the low-melting point alloy wire 2 is not installed in each direction of the sling and the cable, after the polyethylene sheath 15 is installed, a clear mark should be made on the surface of the cable body. When installing the sling and the cable, ensure that the surface with the low-melting point alloy wire 2 is facing the lane. If the bridge adopts a central cable surface layout, the low-melting point alloy wire 2 should be installed in the direction facing the lanes on both sides.

[0059] The bridge cable of the present invention can quickly judge the damage after the fire. By integrating the low-melting point alloy wire with suitable melting point into the cable vulnerable to fire area, the cable with slight damage (ambient temperature below 300°C) can be quickly excluded through the appearance of the low-melting point alloy wire, thereby improving the efficiency of post-disaster detection and greatly shortening the time of bridge safety assessment after the fire. By timely and accurately judging the damage of the fire, the damaged cable components can be found and repaired in time, thereby ensuring the overall safety and stability of the bridge structure, helping to reduce disaster losses and improve the efficiency and effectiveness of emergency response; by eliminating further sampling and testing for cable components where the low-melting point alloy wire has not melted, expensive testing costs can be saved, and at the same time, social costs such as traffic closures that may be caused by sampling operations are avoided, thereby improving the efficiency and speed of bridge recovery after the fire; because stripping off the damaged wrapping and sheathing and replacing and repairing them is the standard process for the treatment of bridge cables after fire, the use of this technology does not increase additional construction costs.

[0060] Example 4

[0061] Combination Figure 1-4 ,like Figure 5 As shown, the present invention provides a method for manufacturing a bridge cable that can quickly determine the damage after a fire, and the specific steps are as follows:

[0062] S100: According to the design requirements of the bridge cable, select an appropriate formula of the low-melting-point alloy wire 2, such as lead-tin-antimony alloy, and determine its melting point range is 280°C to 300°C, prepare the low-melting-point alloy wire 2, and ensure that its diameter, length and other specifications meet the design requirements;

[0063] S200: manufacturing basic components 1 of bridge cables, including high-strength steel wire strands 11, semi-parallel high-strength steel wire bundles 14, winding wires 12, main cable outer protective layer 13 and polyethylene sheath 15, and assembling and pre-processing the basic components 1 according to the specific requirements of the main cable or sling and inclined cable of the suspension bridge;

[0064] S300: For the main cable of the suspension bridge, the low-melting alloy wire 2 is spirally wound outside the S-shaped or circular winding layer, and the spacing can be set as needed, such as 50 cm. For the sling and inclined cable, the low-melting alloy wire 2 and the semi-parallel high-strength steel wire bundle 14 are arranged into strands to ensure that the installation position of the low-melting alloy wire 2 can accurately reflect the maximum temperature that the cable may withstand in a fire;

[0065] S400: After the low-melting-point alloy wire 2 is installed, an anti-corrosion sealing system consisting of anti-corrosion paint, sealant, topcoat, wrapping tape, etc. is applied to the surface of the main cable of the suspension bridge; for the sling and inclined cable, a polyethylene sheath is installed;

[0066] S500: Conduct quality inspection on the manufactured bridge cables, including melting point test of low-melting-point alloy wire 2 and overall strength test of the cables, to ensure that the bridge cables meet the design requirements and have the ability to quickly determine the damage after a fire.

[0067] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bridge cable capable of quickly judging the damage after a fire, characterized in that: The invention comprises a basic element (1) of a bridge cable and at least one low melting point alloy wire (2) as a high temperature indicator, and is used to judge the damage of the cable after a fire; The low melting point alloy wire (2) is made of lead-tin-antimony alloy, with a melting point of 280° C. to 300° C., and its formula can be any one of the following: Contains 15% tin, 81% lead, 3% antimony, and 1% others. Contains 12% tin, 85% lead, 3% antimony, and 1% others. Contains 10% tin, 86% lead, 3% antimony, and 1% others. Contains 8% tin, 87% lead, 3% antimony, and 2% others. Contains 6% tin, 89% lead, 3% antimony and other 2%.

2. A bridge cable capable of quickly judging damage after a fire according to claim 1, characterized in that: In the main cable of a suspension bridge, the basic element (1) comprises a high-strength steel wire strand (11), an S-shaped or round winding wire (12) is arranged on the outside of the high-strength steel wire strand (11), and a main cable outer protective layer (13) is arranged on the outside of the winding wire (12).

3. A bridge cable capable of quickly judging damage after a fire according to claim 1, characterized in that: In the suspension cable and the inclined cable, the basic element (1) comprises a semi-parallel high-strength steel wire bundle (14), and a polyethylene sheath (15) is arranged on the outside of the semi-parallel high-strength steel wire bundle (14).

4. A bridge cable capable of quickly judging damage after a fire according to claim 2, characterized in that: The low melting point alloy wire (2) is arranged on the outside of the winding wire (12) on the main cable of the suspension bridge and is spirally wound on the cable body, with the spacing of the spiral winding being no greater than 50 cm.

5. A bridge cable capable of quickly judging damage after a fire according to claim 3, characterized in that: The low melting point alloy wire (2) is arranged between a semi-parallel high-strength steel wire bundle (14) and a polyethylene sheath (15) on the sling and the inclined cable.

6. A bridge cable capable of quickly judging damage after a fire according to claim 5, characterized in that: The low melting point alloy wire (2) should be twisted into strands with the semi-parallel high-strength steel wire bundle (14) on the sling and the inclined cable, and the polyethylene sheath (15) should be installed together.

7. A bridge cable capable of quickly judging damage after a fire according to any one of claims 1 to 6, characterized in that: The installation range of the low-melting-point alloy wire (2) on the bridge cable can be determined according to the area of ​​the bridge cable that is at risk of being affected by fire, and the low-melting-point alloy wire (2) is installed within a range of not less than 30m from the bridge deck.

8. A bridge cable capable of quickly judging damage after a fire according to any one of claims 1 to 6, characterized in that: If the low-melting-point alloy wire (2) is not installed in every direction of the sling or the inclined cable, after the polyethylene sheath (15) is installed, a clear mark should be made on the surface of the cable body. When installing the sling or the inclined cable, ensure that the surface where the low-melting-point alloy wire (2) is installed faces the lane. If the bridge adopts a central cable surface layout, the low-melting-point alloy wire (2) should be installed in the direction facing the lanes on both sides.

9. A bridge cable capable of quickly judging damage after a fire according to any one of claims 1 to 6, characterized in that: In the same component, a variety of low-melting-point alloy wires (2) with different melting points can be configured to indicate the maximum temperature that the cable can withstand in a fire.

10. A method for manufacturing a bridge cable capable of quickly judging damage after a fire according to any one of claims 1 to 9, characterized in that: include: S100: According to the design requirements of the bridge cable, select an appropriate formula of the low melting point alloy wire (2), such as a lead-tin-antimony alloy, and determine that its melting point ranges from 280° C. to 300° C., prepare the low melting point alloy wire (2), and ensure that its diameter, length and other specifications meet the design requirements; S200: manufacturing basic components (1) of bridge cables, including high-strength steel wire strands (11), semi-parallel high-strength steel wire bundles (14), winding wires (12), main cable outer protective layers (13) and polyethylene sheaths (15), and assembling and pre-processing the basic components (1) according to the specific requirements of the main cables or slings and inclined cables of suspension bridges; S300: For the main cable of the suspension bridge, the low-melting alloy wire (2) is spirally wound outside the S-shaped or circular winding layer, and the spacing can be set as needed, such as 50 cm. For the sling and inclined cable, the low-melting alloy wire (2) and the semi-parallel high-strength steel wire bundle (14) are arranged into strands to ensure that the installation position of the low-melting alloy wire (2) can accurately reflect the maximum temperature that the cable may withstand in a fire; S400: After the low melting point alloy wire (2) is installed, for the main cable of the suspension bridge, an anti-corrosion sealing system consisting of anti-corrosion paint, sealant, topcoat, wrapping tape, etc. is applied on the surface; for the sling and inclined cable, a polyethylene sheath is installed; S500: Conduct quality inspection on the manufactured bridge cables, including melting point test of low-melting-point alloy wire (2) and overall strength test of the cables, to ensure that the bridge cables meet the design requirements and have the ability to quickly determine the damage after a fire.

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