Bridge anti-corrosion equipment and method based on blunt gas

Abstract

The invention discloses a bridge anti-corrosion device and method based on blunt gas, and relates to the technical field of main cable anti-corrosion, a bridge comprises a main cable, the bridge anti-corrosion device comprises a dry gas preparation device, a shell, a plurality of temperature and humidity sensors and a dehumidification assembly, the plurality of temperature and humidity sensors are uniformly fixed in the shell, and the dehumidification assembly is arranged in the shell. The temperature and humidity sensor is used for monitoring the temperature and humidity in the shell in real time, a plurality of exhaust seats are arranged on the shell, each exhaust seat is fixedly connected with an exhaust pipe, and each exhaust pipe is fixedly connected with a one-way valve. The dry gas preparation device is used for preparing nitrogen, the dehumidification assembly comprises a ventilation part, the ventilation part comprises a first ventilation pipe, a first air supply pipe and a second air supply pipe, and the first ventilation pipe is located in the middle of the shell. According to the invention, the effect of dehumidifying the interior of the main cable can be maintained after the dry gas preparation device stops working, and more time is won for timely maintenance after a fault is found on site.

Description

Technical Field

[0001] This invention relates to the field of main cable corrosion protection technology, and in particular to a bridge corrosion protection device and method based on passive gas. Background Technology

[0002] The main cable is a critical and irreplaceable component of a suspension bridge. Corrosion is one of the key factors affecting its service life. Currently, the main methods for controlling main cable corrosion include controlling the external sealing of the main cable and supplying dry gas inside the main cable. By controlling the overall humidity of the steel wires inside the main cable below 40%, the corrosion rate of the main cable can be suppressed. There are two ways to supply dry gas: external supply and internal supply. In recent years, the internal supply of dry gas has developed rapidly. Internal supply of dry gas can make the dry gas inside the main cable diffuse evenly, further improving the dehumidification effect inside the main cable.

[0003] Inspections of the main cables of suspension bridges revealed that corrosion primarily occurred on the outer or lower parts of the cable cross-section, while the interior of the cable, being relatively enclosed, was less prone to corrosion. However, many modern bridges now employ a system where dry gas is supplied internally to the main cable. If the humidity control of this dry gas is inadequate or the dehumidification equipment malfunctions, high-humidity air may be supplied to the cable's interior, posing a significant risk of corrosion to the previously less susceptible internal steel wires.

[0004] Therefore, we propose a bridge corrosion protection device and method for conveying passive gas inside the main cable. Summary of the Invention

[0005] The purpose of this invention is to provide a bridge corrosion protection device and method based on inert gas, which solves the problem in the prior art that, since more and more bridges now use the method of conveying dry gas inside the main cable, if the humidity control of the dry gas is not properly controlled or the dehumidification equipment fails, high humidity air will be conveyed into the main cable, and the steel wires inside the main cable, which were originally not prone to corrosion, will face a major corrosion risk.

[0006] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution: A bridge corrosion protection device based on inert gas is disclosed. The bridge includes a main cable. The device comprises a dry gas preparation unit, a housing, multiple temperature and humidity sensors, and a dehumidification assembly. The temperature and humidity sensors are uniformly fixed inside the housing for real-time monitoring of the internal temperature and humidity. Multiple exhaust seats are provided on the housing, each with a fixed exhaust pipe. Each exhaust pipe is fixedly connected to a one-way valve. The dry gas preparation unit prepares nitrogen gas. The dehumidification assembly includes a ventilation section comprising a first ventilation pipe, a first gas delivery pipe, and a second gas delivery pipe. The first ventilation pipe is located in the middle of the housing and has multiple exhaust holes on its side. One end of the first gas delivery pipe is connected to the outlet of the dry gas preparation unit, and the other end extends into the first ventilation pipe. The second gas delivery pipe is fixed to the unused end of the first ventilation pipe, with one end extending into the first ventilation pipe and the other end connected to a gas storage tank.

[0007] In one or more embodiments of the present invention, the venting section further includes a second vent pipe, which is a hollow stainless steel threaded tube with high-strength galvanized aluminum alloy spiral steel wire wound around its side. The second vent pipe is located inside the housing near the first vent pipe, and the steel wire contacts the side of the second vent pipe. The second vent pipe and the first vent pipe are of equal length, and multiple exhaust holes are opened on the side of the second vent pipe. There are multiple second vent pipes, which are arranged in a ring inside the housing. One end of the second vent pipe is fixed to a hollow first annular tube, and one end of each of the multiple second vent pipes extends into the first annular tube. The other end of the second vent pipe is fixed to a hollow second annular tube, and the other end of each of the multiple second vent pipes extends into the second annular tube. The unused end of the first annular tube is connected to a dry gas preparation device through a pipe, and the unused end of the second annular tube is connected to a gas storage tank through a pipe.

[0008] In one or more embodiments of the present invention, a plurality of exhaust holes located on the same cross section are grouped together. Multiple groups of exhaust holes are provided on the side of the first vent pipe and the side of the second vent pipe, and there is a spacing between each group of exhaust holes, the spacing being between 30m and 60m.

[0009] In one or more embodiments of the present invention, the other end of the first air supply pipe is connected to a U-shaped first distribution pipe. The first distribution pipe has two air outlets, one of which extends into the first vent pipe, and the other air outlet extends into the first annular pipe. One end of the second air supply pipe is connected to a U-shaped second distribution pipe. The second distribution pipe has two air outlets, one of which extends into the first vent pipe, and the other air outlet extends into the second annular pipe.

[0010] In one or more embodiments of the present invention, the ventilation section further includes a turbulence-disrupting section. Multiple turbulence-disrupting sections are uniformly spaced and fixed inside the first and second ventilation pipes, with a spacing between the multiple turbulence-disrupting sections ranging from 18 mm to 36 mm. The turbulence-disrupting section is a flexible thin sheet with serrated edges. When airflow passes through the turbulence-disrupting section, the turbulence-disrupting section can oscillate, causing the airflow to change from a laminar flow state to a turbulent flow state.

[0011] In one or more embodiments of the present invention, the flow-dispersing part is a flexible thin sheet with a wavy cross-section, and a gravity sphere is fixed to the empty end of each flow-dispersing part. The gravity sphere is a hollow sphere with multiple holes on its side, and the multiple holes are spirally distributed on the gravity sphere. The length of the flow-dispersing part is one-third of the diameter of the first vent pipe and the diameter of the second vent pipe.

[0012] In one or more embodiments of the present invention, the dehumidification assembly further includes an air guide pipe, which is an arc-shaped tube with its axis coinciding with the axis of the housing. There are two air guide pipes, one of which is fixed to one housing. One end of each air guide pipe is connected to the outlet of the drying gas preparation device, and multiple branch pipes are fixed to each air guide pipe. Multiple air clamps are fixed to each housing, and the outlet of one branch pipe extends into one air clamp.

[0013] In one or more embodiments of the present invention, one air clamp and two adjacent exhaust seats form a group, and multiple groups of air clamps and exhaust seats are provided on the housing.

[0014] In one or more embodiments of the present invention, a recovery pipe is connected between adjacent exhaust pipes, and nitrogen gas discharged from the exhaust pipes enters the recovery pipes. The empty end of one of the recovery pipes is connected to the inlet of a dry gas preparation device. Each recovery pipe and exhaust pipe is coated with a fire-retardant coating. The recovery pipe is a flexible tube with a melting section fixed to one end. The melting section is an annular hot melt adhesive that melts upon exposure to high temperatures.

[0015] In one or more embodiments of the present invention, the bridge corrosion prevention method includes the following steps: S1. Collect temperature and humidity data inside the housing using the temperature and humidity sensor, and transmit the data to the frequency converter in real time; S2. If the humidity inside the shell is detected to be above 40%, the dry gas preparation device is started by the frequency converter to deliver dry nitrogen into the first gas supply pipe. The nitrogen enters the first vent pipe and is forced into the gap between the steel wires through the exhaust hole of the first vent pipe. S3. The dry nitrogen gas flows in the gap between the steel wires and adsorbs moisture. Finally, the nitrogen gas containing moisture is discharged from the exhaust pipe, thus achieving the purpose of dehumidifying the main cable.

[0016] Compared with existing technologies, the dehumidification component of this invention can maintain the dehumidification effect on the inside of the main cable even after the dry gas preparation device stops working, thus gaining more time for timely repair after a fault is discovered on site and improving the safety of equipment use. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a bridge based on a passive gas-based bridge corrosion protection device and method in one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram showing the positional relationship between the housing and the gas duct of a bridge corrosion protection device and method based on inert gas in one embodiment of the present invention.

[0020] Figure 3 This is a three-dimensional cross-sectional view of the housing structure of a bridge corrosion protection device and method based on passive gas according to an embodiment of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the first vent pipe of a bridge corrosion protection device and method based on inert gas in one embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram showing the positional relationship between the ventilation section and the housing in a bridge corrosion protection device and method based on inert gas according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram showing the positional relationship between the first and second vent pipes of a bridge corrosion protection device and method based on inert gas in one embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram showing the positional relationship between the first vent pipe, the second vent pipe, and the steel wire in a bridge corrosion protection device and method based on inert gas according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the oscillating state of the turbulence section after the airflow enters the bridge anti-corrosion device and method based on inert gas in one embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the connection relationship between the turbulence-disrupting part and the gravity ball in a bridge corrosion protection device and method based on inert gas according to an embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of the shell and the steel wire structure of a bridge corrosion protection device and method based on inert gas according to an embodiment of the present invention.

[0028] Figure 11 This is a schematic diagram of the connection relationship between the exhaust pipe and the recovery pipe in a bridge corrosion protection device and method based on inert gas according to an embodiment of the present invention.

[0029] Figure 12 This is a schematic diagram of the structure of a bridge corrosion protection device and method based on inert gas in one embodiment of the present invention, showing the state of nitrogen gas being ejected after the recovery pipe and exhaust pipe are separated.

[0030] Figure 13 This invention provides a bridge corrosion protection device and method based on passivating gas, as described in one embodiment. Figure 12 A magnified schematic diagram of the structure at point A in the middle.

[0031] In the diagram: 100, main tower; 110, main cable; 111, shell; 1111, steel wire; 120, bridge; 200. Dehumidification component; 210. Drying gas preparation device; 220. Gas guide pipe; 221. Branch pipe; 230. Gas clamp; 240. Ventilation section; 241. First vent pipe; 2411. Exhaust port; 2412. Baffle section; 2413. Gravity ball; 242. First air supply pipe; 2421. First distribution pipe; 2422. First annular pipe; 243. Second air supply pipe; 2431. Second distribution pipe; 2432. Second annular pipe; 244. Second vent pipe; 250, Exhaust seat; 251, Exhaust pipe; 252, Recovery pipe; 2521, Melting section. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0033] like Figures 1 to 9As shown, this application proposes a bridge corrosion protection device based on inert gas. The bridge includes two main towers 100 and two main cables 110. The bridge corrosion protection device includes a dry gas preparation device 210, a housing 111, multiple temperature and humidity sensors, and a dehumidification component 200. The housing 111 is an arc-shaped hollow column with multiple steel wires 1111 located inside it. One housing 111 is fixed between the two main towers 100. The two ends of the main cables 110 are fixed between the two main towers 100 by anchor heads. The two main cables 110 are parallel, and the bottom of the main cables 110 is connected to the bridge 120 by multiple evenly distributed hangers. The main cables 110 support the bridge 120. The device also includes a dehumidification component 200. Each main cable 110 consists of a shell 111 and multiple steel wires 1111. Multiple temperature and humidity sensors are evenly spaced inside the shell 111. The temperature and humidity sensors are used to monitor the temperature and humidity inside the shell 111 in real time. An external control cabinet is installed at the dry gas preparation device 210. A frequency converter is installed in the external control cabinet. The frequency converter receives the real-time data from the temperature and humidity sensors and adjusts the dehumidification rate of the dry gas preparation device 210. The dry gas preparation device 210 is used to prepare nitrogen gas with a purity of 98%. It can effectively isolate oxygen and moisture in the air and is not prone to chemical reaction with steel wire 1111. While dehumidifying, it can also prevent the steel wire 1111 from oxidizing and corroding. The dry gas preparation device 210 is fixed on the top of the main tower 100. The dry gas preparation device 210 is preferably a pressure swing adsorption nitrogen preparation method, but molecular sieve nitrogen preparation or other methods can also be used to ensure that the purity of the nitrogen produced reaches 98%. Dehumidification component 200 is used to dehumidify the inside of main cable 110; The dehumidification component 200 includes a ventilation section 240; The ventilation section 240 includes a first ventilation pipe 241, a first air supply pipe 242, and a second air supply pipe 243; The first vent pipe 241 is a hollow stainless steel threaded pipe with strong corrosion resistance and high pressure resistance, making it suitable for long-term use in complex environments. Its side is wound with high-strength galvanized aluminum alloy spiral steel wire to ensure that the first vent pipe 241 can withstand the torsion and vibration of the main cable. The first vent pipe 241 is located in the middle of the shell 111, and the steel wire 1111 is located on the side of the first vent pipe 241. The steel wire 1111 is in contact with the side of the first vent pipe 241. The first vent pipe 241 has multiple exhaust holes 2411 on its side for discharging nitrogen. One end of the first gas supply pipe 242 is connected to the gas outlet of the dry gas preparation device 210, and dry nitrogen is supplied to the first gas supply pipe 242 through the dry gas preparation device 210. The other end of the first gas supply pipe 242 extends into the first vent pipe 241, and the connection between the first gas supply pipe 242 and the first vent pipe 241 is airtight and fixed. Each housing 111 has multiple exhaust seats 250, and each exhaust seat 250 is fixed with an exhaust pipe 251. Moist air is discharged from the exhaust pipe 251. Each exhaust pipe 251 is fixed with a one-way valve. The one-way valve is used to prevent moist gas from entering the housing 111. The second gas supply pipe 243 is fixed to the unused end of the first vent pipe 241. One end of the second gas supply pipe 243 extends into the first vent pipe 241. The connection between the second gas supply pipe 243 and the first vent pipe 241 is airtight and fixed. The other end of the second gas supply pipe 243 is connected to the gas storage tank. The gas storage tank is fixed on the main tower 100. The gas storage tank is used to store nitrogen. The gas storage tank starts working when the power is off. When the drying gas preparation device 210 is working, the gas storage tank is in the closed state; when the drying gas preparation device 210 stops working, the gas storage tank immediately starts working.

[0034] It should be noted that the gas storage tank does not work under normal conditions, but is activated in the event of a power outage or main system failure. The pressure inside the gas storage tank is usually between 0.8MPa and 1.5MPa. When the main system fails, it automatically switches to the operation of the gas storage tank and reduces the high-pressure gas to a working pressure between 0.2MPa and 0.3MPa through the pressure reducing valve, so as to continuously supply gas to the first vent pipe 241.

[0035] Specifically, such as Figures 3 to 6 As shown, the ventilation section 240 also includes a second ventilation pipe 244; The second vent pipe 244 is a hollow stainless steel threaded pipe with high-strength galvanized aluminum alloy spiral steel wire wound around its side. The second vent pipe 244 is located inside the shell 111 near the first vent pipe 241, and the steel wire 1111 is in contact with the side of the second vent pipe 244. This means that the second vent pipe 244 is also located among multiple steel wires 1111, and there is a distance between the second vent pipe 244 and the first vent pipe 241. The second vent pipe 244 and the first vent pipe 241 are of equal length. The second vent pipe 244 has multiple exhaust holes 2411 on its side. In other words, the second vent pipe 244 and the first vent pipe 241 have the same structure. There are multiple second vent pipes 244, which are arranged in a ring within the housing 111. One end of the second vent tube 244 is fixed with a hollow first annular tube 2422. One end of each of the multiple second vent tubes 244 extends into the first annular tube 2422. The connection between the second vent tube 244 and the first annular tube 2422 is airtight and fixed. The other end of the second vent tube 244 is fixed with a hollow second annular tube 2432. The other end of each of the multiple second vent tubes 244 extends into the second annular tube 2432. The connection between the second vent tube 244 and the second annular tube 2432 is airtight and fixed. The spare end of the first annular pipe 2422 is connected to the dry gas preparation device 210 through a pipe, and the spare end of the second annular pipe 2432 is connected to the gas storage tank through a pipe. That is to say, the first annular pipe 2422 is used to transport nitrogen under normal conditions, and the second annular pipe 2432 is used to transport backup nitrogen when there is a power outage.

[0036] It is easy to understand that by setting multiple second vent pipes 244, nitrogen can be discharged outward from the exhaust holes 2411 of the multiple second vent pipes 244, increasing the contact area between nitrogen and the internal steel wire 1111 and improving dehumidification efficiency.

[0037] Specifically, such as Figures 6 to 9 As shown, multiple exhaust holes 2411 located on the same cross section are grouped together. Multiple groups of exhaust holes 2411 are provided on the side of the first vent pipe 241 and the side of the second vent pipe 244, and there is a spacing between each group of exhaust holes 2411, with the spacing between 30m and 60m.

[0038] It should be noted that the spacing of each set of exhaust vents 2411 needs to be adjusted according to the climate conditions of each region. For example, in high humidity areas, the spacing of each set of exhaust vents 2411 can be controlled at 30m to enhance dehumidification capacity, while in dry areas, the spacing of each set of exhaust vents 2411 can be widened to 60m to reduce energy consumption.

[0039] Specifically, such as Figure 6 As shown, the other end of the first air supply pipe 242 is connected to a U-shaped first distribution pipe 2421. The first distribution pipe 2421 has two air outlets. One air outlet of the first distribution pipe 2421 extends into the first vent pipe 241, and the other air outlet of the first distribution pipe 2421 extends into the first annular pipe 2422. One end of the second air supply pipe 243 is connected to a U-shaped second distribution pipe 2431. The second distribution pipe 2431 has two air outlets. One air outlet of the second distribution pipe 2431 extends into the first air vent pipe 241, and the other air outlet of the second distribution pipe 2431 extends into the second annular pipe 2432.

[0040] It is worth noting that when supplying nitrogen to the first gas supply pipe 242, nitrogen can be supplied to one first vent pipe 241 and multiple second vent pipes 244 simultaneously. Similarly, when supplying backup nitrogen to the second gas supply pipe 243 during a power outage, backup nitrogen can also be supplied to one first vent pipe 241 and multiple second vent pipes 244 simultaneously, reducing the number of gas supply pipes, alleviating the difficulty of pipe laying, and lowering maintenance costs.

[0041] In the above embodiment, nitrogen gas is supplied to the first gas supply pipe 242 through the drying gas preparation device 210. The nitrogen gas enters the first ventilation pipe 241 and the second ventilation pipe 244 simultaneously through the first distribution pipe 2421. The nitrogen gas is forced into the gap between the steel wires 1111 through the exhaust holes 2411 of the first ventilation pipe 241 and the second ventilation pipe 244, driving out the moisture in the gap between the steel wires 1111 and discharging the moisture from the exhaust pipe 251. This allows the moisture in the gap between the steel wires 1111 to be discharged from the inside out, so that the nitrogen gas fills the entire cross-section of the steel wires 1111. At the same time, it maintains a positive pressure state inside the shell 111, effectively reducing the dead zone of airflow organization caused by the air pressure on the outer surface, making dehumidification more comprehensive, and achieving the purpose of dehumidification by supplying inert gas to the inside of the main cable 110. When the drying gas preparation device 210 stops working due to weather, load, and power factors, the gas storage tank starts working. It reduces the high-pressure gas to the working pressure through the pressure reducing valve and starts to continuously supply gas to the first vent pipe 241 and the second vent pipe 244 to maintain the dehumidification system for a short period of time, usually for half an hour to several hours. This ensures that the drying gas preparation device 210 can still maintain the dehumidification effect on the inside of the main cable 110 after it stops working, thus gaining more time for timely repair after a fault is discovered on site and improving the safety of equipment use.

[0042] In some embodiments of this application, such as Figure 8 and Figure 9 As shown, the ventilation section 240 also includes a turbulence section 2412, which is used to prolong the gas residence time; Multiple turbulence-disrupting parts 2412 are evenly spaced inside the first vent pipe 241 and the second vent pipe 244, and there is a gap between the multiple turbulence-disrupting parts 2412, which is between 18mm and 36mm. The turbulence section 2412 is a flexible thin sheet with serrated edges. When the airflow passes through the turbulence section 2412, the turbulence section 2412 can swing, causing the airflow to change from a laminar flow state to a turbulent flow state.

[0043] It should be noted that the disturbance part 2412 is preferably a metal sheet with strong corrosion resistance, or it can be other polymer sheets that can be flexibly deformed, which can ensure its disturbance effect and durability.

[0044] Specifically, such as Figure 9 As shown, the turbulence section 2412 is a flexible thin sheet with a wavy cross-section, which increases the turbulence effect when the airflow passes through it. It is preferably made of UHMWPE material or reinforced PTFE material. Each turbulence section 2412 has a gravity ball 2413 fixed to its empty end. The gravity sphere 2413 is a hollow sphere with multiple holes on its sides. The holes are spirally distributed on the gravity sphere 2413. The gravity sphere 2413 is made of lightweight polymer material. When the airflow passes through the holes, it generates sufficient vortices to further divide the airflow and maintain the intensity of the gas vortex. The length of the turbulence section 2412 is one-third the diameter of the first vent pipe 241 and the diameter of the second vent pipe 244, which can ensure the turbulence effect without increasing energy consumption.

[0045] Based on the above embodiments, when air is circulated in the first vent pipe 241 and the second vent pipe 244, the airflow is in a laminar state. When the airflow passes through the turbulence section 2412, the turbulence section 2412 oscillates under the action of the airflow. The continuous oscillation of the turbulence section 2412 will change the airflow state, causing the airflow to change from a laminar state to a turbulent state, generating a local high-speed jet or backflow zone. Furthermore, when the airflow passes through the holes of the gravity ball 2413, it can form dynamic turbulence, further breaking the boundary layer, thereby further prolonging the time that the airflow stays in the cross section of the steel wire 1111, better expelling the moisture in the gaps between the steel wires 1111, thereby improving the dehumidification efficiency.

[0046] In some embodiments of this application, considering that the water absorption rate of the main cable 110 increases sharply and external moisture continuously flows back in during special weather conditions such as typhoons and rainstorms, the load on the internal dehumidification system of the main cable 110 surges, resulting in a decrease in the dehumidification rate and affecting the dehumidification efficiency, further improvements are made to address the above problems, such as... Figures 2 to 10 As shown; The dehumidification unit 200 also includes an air duct 220; The air duct 220 is an arc-shaped tube and its axis coincides with the axis of the housing 111. There are two air ducts 220, one of which is fixed to one housing 111. One end of each gas guide tube 220 is connected to the gas outlet of the dry gas preparation device 210, and multiple branch tubes 221 are fixed on each gas guide tube 220. Each housing 111 is fixed with multiple air clamps 230, and the air outlet of a branch pipe 221 extends into an air clamp 230.

[0047] Specifically, such as Figures 2 to 10 As shown, an air clamp 230 and two adjacent exhaust seats 250 form a group. The housing 111 is provided with multiple groups of air clamps 230 and exhaust seats 250, with a number of 3 to 4 groups. That is to say, by introducing air into an air clamp 230, exhaust can be released from the two adjacent exhaust seats 250, which facilitates the rapid discharge of moisture.

[0048] In the above embodiments, when encountering special climate conditions or when internal and external dehumidification is required, nitrogen gas is delivered into the air guide pipe 220 through the drying gas preparation device 210, and enters the corresponding air clamp 230 through the branch pipe 221. The nitrogen gas is then forced into the steel wires 1111, so that the nitrogen gas is distributed in the gaps between the steel wires 1111. The humid air in the gaps between the steel wires 1111 is discharged from the exhaust pipe 251, which can quickly remove the moisture in the gaps between the steel wires 1111 and improve the dehumidification efficiency of the main cable 110.

[0049] In some embodiments of this application, considering that in the event of a fire on the bridge 120 due to special circumstances, the relatively open space on the bridge 120 allows the fire to spread rapidly, easily damaging the main cable 110, which is irreplaceable, thus causing serious property damage, further improvements are made to address the above problems, such as... Figures 11 to 13 As shown; A recovery pipe 252 is connected between adjacent exhaust pipes 251. The nitrogen gas discharged from exhaust pipe 251 enters the recovery pipe 252, and the empty end of one of the recovery pipes 252 is connected to the gas inlet of the dry gas preparation device 210. In other words, the discharged nitrogen gas re-enters the dry gas preparation device 210 from the recovery pipe 252, thereby achieving the purpose of energy saving. Each recovery pipe 252 and exhaust pipe 251 is coated with fire-retardant paint, which enables the fire resistance temperature of the recovery pipe 252 and exhaust pipe 251 to be between 600°C and 800°C. Even if a fire occurs, the fire will not easily damage the recovery pipe 252 and exhaust pipe 251 in a short period of time. The recovery tube 252 is a flexible tube with a melting part 2521 fixed at one end. The melting part 2521 is an annular hot melt adhesive. The melting part 2521 melts when exposed to high temperature. The melting point of the melting part 2521 is between 100°C and 120°C, which can be melted by the high temperature generated during a fire. Moreover, the melting part 2521 is not likely to damage the recovery tube 252 after melting. The melting end of the recovery tube 252 has an open structure, and the temperature in hot weather does not reach the melting point of the melting part 2521, so it will not melt and break.

[0050] In the above embodiment, the moisture discharged from the housing 111 contains a large amount of nitrogen. The moisture containing nitrogen enters the recovery pipe 252 from the exhaust pipe 251 and is sent to the dry gas preparation device 210 through one of the recovery pipes 252. This not only reduces the time for the dry gas preparation device 210 to prepare nitrogen, but also reduces resource waste and realizes the recycling of nitrogen. When a fire occurs on the bridge 120, the temperature at the recovery pipe 252, which is closest to the fire point, is high and can quickly reach the melting point of the melting section 2521. After the melting section 2521 melts, the recovery pipe 252 is disconnected from the exhaust pipe 251. At this time, the melting end of the recovery pipe 252 is an open structure, and nitrogen gas continues to be discharged from the exhaust pipe 251. The nitrogen gas can be sprayed out from the opening of the recovery pipe 252. After the recovery pipe 252 falls, the personnel on the bridge 120 can move the recovery pipe 252 to extinguish the fire. The continuous spraying of nitrogen gas through the recovery pipe 252 can suppress the further spread of the fire, buy valuable time for rescue personnel, and reduce equipment losses.

[0051] In some embodiments of this application, such as Figures 1 to 13 As shown, the bridge corrosion protection method includes the following steps: S1. Collect temperature and humidity data inside housing 111 using a temperature and humidity sensor, and transmit the data to the frequency converter in real time; S2. If the humidity inside the housing 111 is detected to be above 40%, the dry gas preparation device 210 is started by the frequency converter to deliver dry nitrogen into the first gas supply pipe 242. The nitrogen enters the first vent pipe 241 and is forced into the gap between the steel wires 1111 through the exhaust hole 2411 of the first vent pipe 241. S3. Dry nitrogen flows in the gap between the steel wires 1111 and adsorbs moisture. Finally, the nitrogen containing moisture is discharged from the exhaust pipe 251, thus achieving the purpose of dehumidifying the main cable 110.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bridge corrosion protection device based on passivating gas, the bridge comprising a main cable, characterized in that, The bridge corrosion protection equipment includes a dry gas preparation device, a housing, multiple temperature and humidity sensors, and a dehumidification component. The multiple temperature and humidity sensors are uniformly fixed inside the housing. The temperature and humidity sensors are used to monitor the temperature and humidity inside the housing in real time. The housing has multiple exhaust seats, each of which is fixedly connected to an exhaust pipe. Each exhaust pipe is fixedly connected to a one-way valve. The drying gas preparation device is used to prepare nitrogen gas. The dehumidification component includes a ventilation section, which includes a first ventilation pipe, a first gas supply pipe and a second gas supply pipe. The first ventilation pipe is located in the middle of the shell and has multiple exhaust holes on its side. One end of the first gas supply pipe is connected to the gas outlet of the drying gas preparation device, and the other end of the first gas supply pipe extends into the first vent pipe. The second air supply pipe is fixed to the empty end of the first air supply pipe, one end of the second air supply pipe extends into the first air supply pipe, and the other end of the second air supply pipe is connected to the air storage tank.

2. The bridge corrosion protection device based on passivated gas according to claim 1, characterized in that, The ventilation section also includes a second ventilation pipe; The second vent pipe is a hollow stainless steel threaded pipe with high-strength galvanized aluminum alloy spiral steel wire wound around its side. The second vent pipe is located inside the shell near the first vent pipe, and the steel wire is in contact with the side of the second vent pipe. The second vent pipe is the same length as the first vent pipe, and the second vent pipe has multiple exhaust holes on its side; There are multiple second vent pipes, which are arranged in a ring inside the shell; One end of the second vent tube is fixed with a hollow first annular tube, and one end of each of the multiple second vent tubes extends into the first annular tube. The other end of the second vent tube is fixed with a hollow second annular tube, and the other end of each of the multiple second vent tubes extends into the second annular tube. The unused end of the first annular tube is connected to a dry gas preparation device via a pipe, and the unused end of the second annular tube is connected to a gas storage tank via a pipe.

3. The bridge corrosion protection device based on passivated gas according to claim 2, characterized in that, Multiple exhaust holes located on the same cross section are grouped together. Multiple groups of exhaust holes are provided on the side of the first vent pipe and the side of the second vent pipe, and there is a spacing between each group of exhaust holes, with the spacing being between 30m and 60m.

4. The bridge corrosion protection device based on passivated gas according to claim 2, characterized in that, The other end of the first air supply pipe is connected to a U-shaped first distribution pipe. The first distribution pipe has two air outlets. One air outlet of the first distribution pipe extends into the first vent pipe, and the other air outlet of the first distribution pipe extends into the first annular pipe. One end of the second air supply pipe is connected to a U-shaped second distribution pipe. The second distribution pipe has two air outlets. One air outlet of the second distribution pipe extends into the first air vent pipe, and the other air outlet of the second distribution pipe extends into the second annular pipe.

5. The bridge corrosion protection device based on passivated gas according to claim 1, characterized in that, The ventilation section also includes a turbulence-inducing section; The first and second vent pipes are each fixed with multiple turbulence-inducing parts at even intervals inside, and there is a gap between the multiple turbulence-inducing parts, which is between 18mm and 36mm. The turbulence-disrupting part is a flexible thin sheet with serrated edges. When the airflow passes through the turbulence-disrupting part, the turbulence-disrupting part can swing, causing the airflow to change from a laminar flow state to a turbulent flow state.

6. The bridge corrosion protection device based on passivated gas according to claim 5, characterized in that, The turbulence section is a flexible thin sheet with a wavy cross-section, and a gravity ball is fixed to the empty end of each turbulence section; The gravity sphere is a hollow sphere with multiple holes on its side, and the multiple holes are spirally distributed on the gravity sphere. The length of the turbulence section is one-third of the diameter of the first vent pipe and the diameter of the second vent pipe.

7. The bridge corrosion protection device based on passivated gas according to claim 1, characterized in that, The dehumidification assembly also includes an air duct; The air guide tube is an arc-shaped tube with its axis coinciding with the axis of the shell, and there are two air guide tubes, one of which is fixed to one shell. One end of each of the gas guide tubes is connected to the gas outlet of the dry gas preparation device, and multiple branch tubes are fixed on each gas guide tube; Each of the housings is fixed with multiple air clamps, and the air outlet of a branch pipe extends into one air clamp.

8. The bridge corrosion protection device based on passivated gas according to claim 7, characterized in that, One air clamp and two adjacent exhaust seats form a group, and multiple groups of air clamps and exhaust seats are provided on the housing.

9. The bridge corrosion protection device based on passivated gas according to claim 1, characterized in that, A recovery pipe is connected between adjacent exhaust pipes. The nitrogen gas discharged from the exhaust pipes enters the recovery pipe, and the empty end of one of the recovery pipes is connected to the gas inlet of the dry gas preparation device. Each of the aforementioned recovery pipes and exhaust pipes is coated with fire-retardant paint. The recycling tube is a flexible tube with a melting part fixed at one end. The melting part is an annular hot melt adhesive that melts when exposed to high temperature.

10. A method for bridge corrosion protection based on passivated gas, applied to the bridge corrosion protection equipment based on passivated gas as described in any one of claims 1-9, characterized in that, The bridge corrosion protection method includes the following steps: S1. Collect temperature and humidity data inside the housing using the temperature and humidity sensor, and transmit the data to the frequency converter in real time; S2. If the humidity inside the shell is detected to be above 40%, the dry gas preparation device is started by the frequency converter to deliver dry nitrogen into the first gas supply pipe. The nitrogen enters the first vent pipe and is forced into the gap between the steel wires through the exhaust hole of the first vent pipe. S3. The dry nitrogen gas flows in the gap between the steel wires and adsorbs moisture. Finally, the nitrogen gas containing moisture is discharged from the exhaust pipe, thus achieving the purpose of dehumidifying the main cable.

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