Fireproof protection structure of box-type steel box girder bridge

Abstract

The utility model relates to a fireproof protection technology of a girder bridge, in particular to a fireproof protection structure of a box-type steel box girder bridge, which comprises a steel box girder (1) and is characterized by further comprising protection pipes (2), the protection pipes (2) are fixedly attached to all side faces of the steel box girder (1) through respective side walls in a criss-cross mode, and inner cavities of the protection pipes (2) are communicated with one another. Independent water storage units and a through water flowing channel are arranged in the protection pipe (2), and the water flowing channel of a box body unit with an upward opening is formed above each water storage unit in the protection pipe (2) in the horizontal direction; the water storage units in the protection pipe (2) in the vertical direction and the side wall of the protection pipe (2) form the S-like folding water flowing channel. The safety guarantee effect is lasting and effective, and the risk resistance of a bridge system is improved.

Description

Technical Field

[0001] This utility model relates to fire protection technology for beam bridges, specifically a fire protection structure for box girder bridges. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges. They are generally used on bridges with large spans. Steel box girders are generally composed of a top plate, bottom plate, web, transverse diaphragms, longitudinal diaphragms, and stiffening ribs, all connected by full welding. The top plate is an orthotropic bridge deck composed of a cover plate and longitudinal stiffening ribs.

[0003] As steel-structured bridges, steel box girder bridges have poor fire resistance. In the event of a fire, the steel structure may suffer severe damage or even collapse. Bridges are crucial links in transportation routes; damage in a fire not only seriously threatens the lives of people on the bridge but also severely disrupts the transportation system. Therefore, steel box girder bridges are typically equipped with fire protection systems. Statistics show that the fire protection system areas of steel box girder bridges are more likely to be impacted than other areas. Once an impact causes localized damage to the fire protection system, it loses its protective function and has poor resilience against fire.

[0004] CN117427293A discloses a fire protection system for steel box girder bridges (Central South University, inventors Jiang Binhui et al.). This system includes multiple hollow fireproof protective pipes surrounding the steel box girder bridge, which are crisscrossed and interconnected to form a connecting pipeline. The inlet of the connecting pipeline is connected to a water collection unit, which includes a water collection chamber, a water storage chamber, and a water level control chamber arranged sequentially from top to bottom and interconnected. The water collection chamber collects fluid, the water storage chamber stores the collected fluid, and the water level control chamber controls the flow rate of the fluid into the connecting pipeline. By forming a connecting pipeline through multiple hollow fireproof protective pipes, the fluid flowing into the connecting pipeline can rapidly reduce the temperature of the steel box girder bridge, effectively protecting it and preventing large-scale damage. This buys more time for fire suppression and avoids irreversible significant economic losses and adverse social impacts after a fire.

[0005] CN117427293A has the following limitations and potential risks: Multiple hollow fireproof protective tubes are crisscrossed and interconnected to form a protective tube network. These hollow fireproof protective tubes wrap around the exterior of the steel box girder bridge to be protected. For the steel box girder bridge, the protective tube network forms a protective outer layer. When a fire occurs on the steel box girder bridge, the fluid flowing within the hollow fireproof protective tubes can flow freely between different protective tubes within the network, thus quickly reducing the temperature of the steel box girder bridge. The hollow fireproof protective tubes are made of materials with good thermal conductivity and durability, not limited to stainless steel. Good thermal conductivity and durability here refer to a thermal conductivity of 5 W / (m∙℃) or higher, capable of withstanding the erosion of the outdoor natural environment in the absence of a fire. However, over time, if a leak occurs anywhere in the protective outer layer formed by the tube network, the fire protection is prone to failure. This is precisely the limitation and weakness of this technical solution.

[0006] Based on the aforementioned technical problems, inventors Jiang Binhui et al. further proposed the technical solution of this application. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, this utility model provides a fire protection structure for box girder bridges. This utility model applies to the technical solution CN117427293A, and can provide a safety guarantee mechanism, improving the protection system's ability to resist risks.

[0008] This utility model achieves its invention objective through the following technical solution:

[0009] The fire protection structure for a box girder bridge includes a steel box girder (1) and a protective pipe (2). The protective pipe (2) is attached and fixed to each side of the steel box girder (1) and is a crisscrossing, interconnected device. Its characteristics are:

[0010] Numerous modular box-type water storage units (4) are arranged inside the protective pipe (2). Each water storage unit is independent. While arranging the water storage units inside the protective pipe (2), a through water flow channel is formed inside the protective pipe (2). The arrangement method is as follows:

[0011] Inside the horizontal protective pipe (2), the height of the water storage unit (4) is less than the height of the inner cavity of the protective pipe (2). The water storage units (4) are arranged one after another in the lower part of the inner cavity of the protective pipe (2). The opening of each water storage unit (4) faces upward, and a water flow channel is formed above each water storage unit (4).

[0012] Inside the vertical protective tube (2), the width of the water storage unit (4) is smaller than the width of the inner cavity of the protective tube (2). The water storage units (4) are arranged alternately on both sides of the inner cavity of the protective tube (2). Each water storage unit (4) has its opening facing upwards, forming an "S-shaped" folded water flow channel with the side wall of the protective tube (2).

[0013] The fire protection structure for the box-type steel box girder bridge is characterized by: modular box-type water storage unit (4):

[0014] They are sequentially placed at the bottom of the horizontal protective tube (2).

[0015] The fire protection structure for the box-type steel box girder bridge is characterized by: modular box-type water storage unit (4):

[0016] The protective tubes (2) are sequentially installed on the side walls in the vertical direction;

[0017] The water storage units are arranged alternately on both sides of the inner cavity of the protective pipe (2), so that each water storage unit (4) and the side wall of the protective pipe (2) in the vertical direction form an "S-shaped" folded water flow channel.

[0018] The fire protection structure for the box-type steel box girder bridge is characterized by: modular box-type water storage unit (4):

[0019] Specifically, the water storage unit (4) is designed as an upward-opening trough, and ear plates (41) are provided on both sides of the water storage unit (4). The bolt-nut assembly (42) is screwed into the ear plates (41) to fix the water storage unit to the bottom of the protective tube (2).

[0020] The fire protection structure for the box-type steel box girder bridge is characterized by: modular box-type water storage unit (4):

[0021] Specifically, the water storage unit (4) is designed as an upward-opening trough. The top of the water storage unit (4) is provided with an ear plate (41). The bolt-nut assembly (42) is screwed into the ear plate (41) to fix the water storage unit to one corner of the protective tube (2).

[0022] This utility model's technical solution is implemented within a "communicating vessel" consisting of multiple hollow protective pipes crisscrossing and interconnecting each other. The protective pipes can also be connected to a water replenishment device and a water circulation drive device. This utility model improves the structure of the protective pipes surrounding the steel box girder bridge, forming multiple water storage units inside the protective pipes and creating a unique flow channel system. When a local leak occurs in the protection system, the static water storage unit 4 and the dynamic flow channel can still store water, ensuring that the pipeline system's water storage and delivery systems do not fail and maintain their fire protection function, thus preventing the entire fire protection system from failing.

[0023] This invention retains the advantages of the fire protection system connector for steel box girder bridges while improving the system's ability to resist risks.

[0024] This invention has the following beneficial effects: it provides long-lasting and effective safety protection and improves the bridge system's ability to resist risks. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the water flow in the structure and piping system of this utility model.

[0026] Figure 2 This is a schematic diagram of a modular box-type water storage unit installed inside the protective pipe in this utility model.

[0027] Figure 3 This is a schematic diagram of the modular box-type water storage unit inside the horizontally oriented protective pipe in this utility model.

[0028] Figure 4 This is a schematic diagram of the modular box-type water storage unit inside the vertically oriented protective pipe in this utility model.

[0029] Figure 5 and Figure 6 This is a schematic diagram of the water flow when the vertical protective pipe of this utility model is damaged during use.

[0030] Figure 7 This is a schematic diagram of the water flow when the horizontal protective pipe of this utility model is damaged during use.

[0031] Figure 8 This is a schematic diagram of the water flow when the bottom protective pipe is damaged during the use of this utility model. Detailed Implementation

[0032] The present invention will be further illustrated by specific embodiments below.

[0033] Example 1

[0034] Figure 1 , Figure 2 As shown, the fire protection structure of the box girder bridge includes a steel box girder 1 and protective pipes 2. The protective pipes 2 are attached and fixed to each side of the steel box girder 1, forming a crisscrossing, interconnected communication device.

[0035] Numerous modular box-type water storage units 4 are arranged inside the protective pipe 2. Each water storage unit is independent. While arranging the water storage units inside the protective pipe 2, a continuous water flow channel is formed within the protective pipe 2. The arrangement method is as follows:

[0036] Inside the horizontal protective pipe 2, the height of the water storage unit is less than the height of the inner cavity of the protective pipe 2. The water storage units are arranged one after another in the lower part of the inner cavity of the protective pipe 2. Above each of the water storage units in the horizontal protective pipe 2, a water flow channel of the box unit with an upward opening is formed.

[0037] Inside the vertical protective pipe 2, the width of the water storage unit is smaller than the width of the inner cavity of the protective pipe 2. The water storage units are arranged alternately on both sides of the inner cavity of the protective pipe 2. The water storage units and the side wall of the protective pipe 2 form an "S-shaped" folded water flow channel.

[0038] like Figure 2 , Figure 3 , Figure 4 As shown:

[0039] Modular box-type water storage unit 4: sequentially installed at the bottom of the horizontal protective pipe 2.

[0040] Modular box-type water storage unit 4: sequentially arranged on the side wall of the vertical protective pipe 2; the water storage units are arranged alternately on both sides of the inner cavity of the protective pipe 2, so that each water storage unit 4 and the side wall of the protective pipe 2 form an "S-shaped" folded water flow channel in the vertical protective pipe 2.

[0041] Modular box-type water storage unit 4: Specifically, the water storage unit 4 is designed as an upward-opening tank. The top of the water storage unit 4 is provided with an ear plate 41. The bolt-nut assembly 42 is screwed into the ear plate 41 to fix the water storage unit 41 to one corner of the protective pipe 2.

[0042] The top of the protective pipe 2 is connected to the rainwater collection inlet (not shown in the figure) and also to the water replenishment device (not shown in the figure).

[0043] The water storage unit 4 in the embodiment can be respectively as follows: Figure 3 and Figure 4 As shown:

[0044] Figure 3 The water storage unit 4 is designed as an upward-opening trough. The water storage unit 4 has ear plates 41 on both sides. The bolt-nut assembly 42 is screwed into the ear plates 41 to fix the water storage unit 4 to the bottom of the protective tube 2.

[0045] Figure 4 The water storage unit 4 is designed as an upward-opening trough. The top of the water storage unit 4 is provided with an ear plate 41. The bolt-nut assembly 42 is screwed into the ear plate 41 to fix the water storage unit 4 to one corner of the protective tube 2.

[0046] The aforementioned modular box-type water storage unit 4 is designed as an open box-type module with bolt connections, which facilitates installation, disassembly, and replacement, and is easy to promote.

[0047] Based on the above structural design, the bridge safety guarantee mechanism remains intact in the event of any hazard occurring to protective pipe 2. A complete list of all possible scenarios is provided below:

[0048] i. A leak occurs in the longitudinal piping of the piping system:

[0049] When a point of failure occurs on the side wall of the protective pipe in the vertical direction, the possible situations are as follows: Figure 5 or Figure 6 The X in the diagram represents the point of failure. At this point:

[0050] Figure 5 In the middle, the leak point appears on the wall of the protective pipe 2 opposite the water storage module 4. All the water storage modules 4 are always full. Only a small area of ​​gap may appear above the damage point of the vertical protective pipe 2, while the entire pipeline system is operating normally.

[0051] Figure 6 In the middle, the leak point appears on the wall of the protective pipe 2 on the same side as the water storage module 4. The water storage module 4 is not full, while the water storage in the other remaining water storage modules 4 is always full. A small area of ​​gap may also appear above the point of failure of the vertical protective pipe 2, while the entire pipeline system is operating normally.

[0052] ii. Leaks occur in the horizontal pipes of the piping system:

[0053] When a point of failure occurs at the bottom of one side of the horizontal protective pipe 2, the possible location of the failure is point X in 7. At this time:

[0054] The leak occurred at the bottom of a water storage module 4, where the water level was low or even empty. Meanwhile, other water storage modules 4 on the adjacent branch remained full. This branch can be considered to operate independently after the entire pipeline system was disconnected. Functionally, the entire pipeline system continues to operate normally.

[0055] iii. A leak occurs in the bottom pipe of the piping system:

[0056] When a point of failure occurs at the very bottom of protective tube 2, the possible scenario is as shown by point X in 8, which is the location of the failure. At this time:

[0057] In this case, apart from the problem of wasting water, all water storage modules 4 will not lose or run out of water, and the entire pipeline system will maintain normal operation in terms of overall function.

[0058] It is evident that, considering all possible leak points, the pipeline system structure of this invention can logically maintain water supply functionality even if a leak occurs at any point on the protective pipe 2, thanks to the independent water storage functions of each water storage module 4 and the structural design of the water flow channel. Since the pipeline system is not completely paralyzed, but only slightly weakened, it continues to protect the steel box girder 1, thus providing a possibility for subsequent rescue efforts.

Claims

1. A fire protection structure for a box girder bridge, comprising a steel box girder (1) and a protective pipe (2), wherein the protective pipe (2) is attached and fixed to each side of the steel box girder (1), and is a crisscrossing and interconnected communicating vessel, characterized in that: Numerous modular box-type water storage units (4) are arranged inside the protective pipe (2). Each water storage unit is independent. While arranging the water storage units inside the protective pipe (2), a through water flow channel is formed inside the protective pipe (2). The arrangement method is as follows: Inside the horizontal protective pipe (2), the height of the water storage unit (4) is less than the height of the inner cavity of the protective pipe (2). The water storage units (4) are arranged one after another in the lower part of the inner cavity of the protective pipe (2). The opening of each water storage unit (4) faces upward, and a water flow channel is formed above each water storage unit (4). Inside the vertical protective tube (2), the width of the water storage unit (4) is smaller than the width of the inner cavity of the protective tube (2). The water storage units (4) are arranged alternately on both sides of the inner cavity of the protective tube (2). Each water storage unit (4) has its opening facing upwards, forming an "S-shaped" folded water flow channel with the side wall of the protective tube (2).

2. The fire protection structure for box girder bridges as described in claim 1, characterized in that: Modular box-type water storage unit (4): They are sequentially placed at the bottom of the horizontal protective tube (2).

3. The fire protection structure for box girder bridges as described in claim 1, characterized in that: modularization. Box-type water storage unit (4): The protective tubes (2) are sequentially installed on the side walls in the vertical direction; The water storage units are arranged alternately on both sides of the inner cavity of the protective pipe (2), so that each water storage unit (4) and the side wall of the protective pipe (2) in the vertical direction form an "S-shaped" folded water flow channel.

4. The fire protection structure for box girder bridges as described in claim 2, characterized in that: modularization. Box-type water storage unit (4): Specifically, the water storage unit (4) is designed as an upward-opening trough, and ear plates (41) are provided on both sides of the water storage unit (4). The bolt-nut assembly (42) is screwed into the ear plates (41) to fix the water storage unit (4) to the bottom of the protective tube (2).

5. The fire protection structure for box girder bridges as described in claim 3, characterized in that: modularization. Box-type water storage unit (4): Specifically, the water storage unit (4) is designed as an upward-opening trough. The top of the water storage unit (4) is provided with an ear plate (41). The bolt-nut assembly (42) is screwed into the ear plate (41) to fix the water storage unit (4) to one corner of the protective tube (2).

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