Steel box girder bridge fireproof protection structure based on water storage sponge design

Abstract

The utility model relates to the field of fireproof protection of bridges, in particular to a fireproof protection structure of a steel box girder bridge based on water storage sponge design, 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. Each independent water storage unit (21) and a through water flowing channel (22) are arranged in the protection pipe (2). 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 bridges, specifically a fire protection structure for a steel box girder bridge based on a water-storage sponge design. 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. Utility Model Content

[0007] In order to overcome the shortcomings of the existing technology and provide a protective device with good fire protection performance, this utility model discloses a fire protection structure for steel box girder bridges.

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

[0009] A fire protection structure for a steel box girder bridge based on a water-storage sponge design, comprising a steel box girder, characterized in that it also includes a protective pipe.

[0010] The protective pipes are crisscrossed and interconnected, with their respective side walls attached to and fixed to the sides of the steel box girder. Each protective pipe contains an independent suction and storage unit and a continuous water flow channel.

[0011] Inside the horizontal protective tube, the height of the suction and storage unit is less than the height of the inner cavity of the protective tube. The suction and storage units are attached to and fixed one by one on the bottom surface of the inner cavity of the protective tube, and a horizontal water flow channel is formed above each suction and storage unit inside the protective tube.

[0012] Inside the vertical protective tube, the width of the storage unit is smaller than the width of the inner cavity of the protective tube. The storage units are attached to and fixed one side of the inner cavity of the protective tube, and a longitudinal water flow channel is formed on one side of the storage unit inside the protective tube.

[0013] The fire protection structure of the steel box girder bridge based on the water-storage sponge design is characterized by: further including partitions, with one partition fixed to each of the two end faces of each water-absorbing unit.

[0014] Inside the horizontally oriented protective tube, each storage unit is vertically fixed to the bottom surface of the inner cavity of the protective tube via partitions; inside the vertically oriented protective tube, each storage unit is horizontally fixed to one side of the inner cavity of the protective tube via partitions.

[0015] The fire protection structure for the steel box girder bridge based on the water-storing sponge design is characterized by: further including a water-storing sponge.

[0016] The partitions are either straight or L-shaped, and a water-storing sponge is embedded between each pair of partitions to form a water-absorbing and storing unit.

[0017] The fire protection structure of the steel box girder bridge based on the water-storage sponge design is characterized by:

[0018] Inside the vertical protective tube, each storage unit is fixed sequentially on the same side of the inner cavity of the protective tube, or alternately fixed on two sides of the inner cavity of the protective tube.

[0019] As a special type of protective equipment, the fire protection system for steel box girder bridges cannot be designed using buried pipes like other protective equipment due to its unique working environment. It requires a simple structure, convenient and flexible fabrication, installation, and disassembly, while also providing effective protection and preventing water leakage.

[0020] This utility model is used for steel box girder bridges:

[0021] Multiple hollow protective pipes are crisscrossed and interconnected to form a connecting pipeline. The protective pipes are connected to a water supply device and a water circulation drive device, respectively. Water flows into the protective pipes to cool the steel box girder wrapped by the protective pipes.

[0022] This invention improves the structure of the protective pipe surrounding the steel box girder bridge, forming multiple water storage units inside the pipe. Even in the event of partial damage to the protection system, it can still store some water, continuing to provide fire protection and preventing the entire fire protection system from failing.

[0023] In normal operation, the protective tube is rapidly replenished with water through the water flow channel, while the water-storing sponge absorbs water. The baffles at both ends support the sponge and prevent it from shifting position and clogging the protective tube. If a leak occurs in the protective tube, and the leak is on the sponge side, it slows the rate of water leakage through the water flow channel while ensuring normal water flow within the channel, allowing it to continue operating normally for a certain period and thus protecting the steel box girder. If the leak occurs on the water flow channel side, even after the water in the channel has drained, the remaining water in the sponge can help reduce the temperature of the steel box girder encased by the protective tube. Simultaneously, the sponge, located inside the protective tube, provides support and cushions impacts.

[0024] 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. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure and pipeline system of Embodiment 1 of this utility model, showing the water flow.

[0026] Figure 2 This is a partial structural diagram of the suction and storage unit installed inside the protective tube in this utility model. Detailed Implementation

[0027] The present invention will be further illustrated by specific embodiments below.

[0028] Example 1

[0029] A fire protection structure for a steel box girder bridge based on a water-storage sponge design includes a steel box girder 1 and a protective pipe 2, such as... Figure 1 and Figure 2 As shown, the specific structure is:

[0030] The protective pipes 2 are crisscrossed and interconnected, and are fixed to the sides of the steel box girder 1 through their respective side walls. Each protective pipe 2 contains an independent suction and storage unit 21 and a continuous water flow channel 22, wherein:

[0031] Inside the horizontal protective tube 2, the height of the storage unit 21 is less than the height of the inner cavity of the protective tube 2. The storage units 21 are attached to and fixed one by one on the bottom surface of the inner cavity of the protective tube 2. A horizontal water flow channel 22 is formed above each storage unit 21 inside the protective tube 2.

[0032] Inside the vertical protective tube 2, the width of the storage unit 21 is smaller than the width of the inner cavity of the protective tube 2. The storage units 21 are attached to and fixed one side of the inner cavity of the protective tube 2, and a longitudinal water flow channel 22 is formed on one side of the storage unit 21 inside the protective tube 2.

[0033] In this embodiment: each water storage unit 21 includes two partitions 3 and a water storage sponge 4. The partitions 3 can be straight or L-shaped. In this embodiment, the L-shaped partition is selected. One end of each water storage sponge 4 is covered and fixed with a partition 3 to form a water storage unit 21. The water storage unit 21 is fixed in the protective tube 2 in sequence through the partitions 3.

[0034] in:

[0035] Inside the horizontal protective tube 2, each storage unit 21 is vertically fixed to the bottom surface of the inner cavity of the protective tube 2 through the partitions 3 at both ends. Inside the vertical protective tube 2, each storage unit 21 is horizontally fixed to the two sides of the inner cavity of the protective tube 2 through the partitions 3 at both ends in a staggered manner.

[0036] Each partition 3 has a water-storage sponge 4 embedded between it to form a water-absorbing and storage unit 21.

[0037] In this embodiment:

[0038] Water-storing sponge 4 uses porous fiber cotton, permeable rock wool, or ecological fiber porous cotton: This is a type of rock wool or mineral wool made primarily from high-quality basalt, dolomite, corundum, etc., with improved processes and slight changes in raw materials. Its basic parameters are as follows:

[0039] Standard density 75 kg / m³ 3 Compressive strength ≥ 50 kPa, effective porosity ≥ 94%, permeability coefficient ≥ 0.5 cm / s.

[0040] Fire resistance: Class A non-combustible fireproof material.

[0041] Durability: Service life of not less than 25 years.

[0042] Water retention: After 200 hours, the volumetric water absorption rate is still around 50%.

[0043] The partition 3 can be made of stainless steel plate and welded inside the protective pipe 2 to support and fix the water-storing sponge 4. The specific number can be determined by the actual project.

[0044] This embodiment is used for steel box girder bridges:

[0045] Under normal operating conditions, the protective pipe 2 is quickly replenished with water through the water flow channel 22, while the water storage sponge 4 is fully saturated with water. The baffles 3 at both ends provide support for the water storage sponge 4 and prevent the position of the water storage sponge 4 from changing and thus clogging the protective pipe 2.

[0046] When a leak occurs in the protective pipe, if the leak occurs on the side of the water-storing sponge 4, it can slow down the rate at which water leaks through the water flow channel 22, and also ensure that the water in the water flow channel 22 can flow normally and continue to work normally for a certain period of time, thus protecting the steel box girder 1. If the leak occurs on the side of the water flow channel 22, the water in the water flow channel 22 will drain out, and the water-storing sponge 4 will still contain some water, which can be used to reduce the temperature of the steel box girder 1 wrapped by the protective pipe 2. At the same time, the water-storing sponge 4 is inside the protective pipe 2 and provides support for the protective pipe 2, buffering some of the impact.

[0047] Example 2

[0048] A fire protection structure for a steel box girder bridge based on a water-storage sponge design includes a steel box girder 1 and a protective pipe 2. Specifically, within the vertically oriented protective pipe 2, each water-absorbing unit 21 is horizontally fixed to the same side of the inner cavity of the protective pipe 2 via partitions 3 at both ends. Other structural features are the same as in Embodiment 1.

Claims

1. A fire protection structure for a steel box girder bridge based on a water-storage sponge design, comprising a steel box girder (1), characterized in that: It also includes a protective tube (2), The protective pipes (2) are fixed to the sides of the steel box girder (1) in a crisscross pattern with interconnected internal cavities, and are attached to each other through their respective side walls. Each protective pipe (2) contains an independent storage unit (21) and a through water flow channel (22), wherein: Inside the horizontal protective tube (2), the height of the storage unit (21) is less than the height of the inner cavity of the protective tube (2). The storage units (21) are attached to and fixed on the bottom surface of the inner cavity of the protective tube (2) one by one. A horizontal water flow channel (22) is formed above each storage unit (21) in the protective tube (2). Inside the vertical protective tube (2), the width of the storage unit (21) is smaller than the width of the inner cavity of the protective tube (2). The storage units (21) are attached to and fixed on one side of the inner cavity of the protective tube (2). A longitudinal water flow channel (22) is formed on one side of the storage unit (21) inside the protective tube (2).

2. The fire protection structure for steel box girder bridges based on water-storage sponge design as described in claim 1, characterized in that: It also includes partitions (3), with one partition (3) fixed to each of the two end faces of each storage unit (21). Inside the horizontal protective tube (2), each storage unit (21) is vertically fixed to the bottom surface of the inner cavity of the protective tube (2) in sequence through the partition (3); inside the vertical protective tube (2), each storage unit (21) is horizontally fixed to one side of the inner cavity of the protective tube (2) in sequence through the partition (3).

3. The fire protection structure for steel box girder bridges based on water-storage sponge design as described in claim 2, characterized in that: It also includes water-storage sponges (4), The partition (3) is in the shape of a straight line or an L-shape. A water-storing sponge (4) is embedded and fixed between each two partitions (3) to form a water-storing unit (21).

4. The fire protection structure for steel box girder bridges based on water-storage sponge design as described in claim 2 or 3, characterized in that: Inside the vertical protective tube (2), each storage unit (21) is fixed sequentially on the same side of the inner cavity of the protective tube (2), or sequentially fixed on two sides of the inner cavity of the protective tube (2) in an alternating manner.

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