CN215441399U - Fire-proof device for cable-stayed bridge inhaul cable - Google Patents
Fire-proof device for cable-stayed bridge inhaul cable Download PDFInfo
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- CN215441399U CN215441399U CN202120654427.9U CN202120654427U CN215441399U CN 215441399 U CN215441399 U CN 215441399U CN 202120654427 U CN202120654427 U CN 202120654427U CN 215441399 U CN215441399 U CN 215441399U
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Abstract
The utility model discloses a fireproof device for a cable-stayed bridge cable, which comprises a cable body stretched between a bridge and a bridge tower, wherein the cable body is circumferentially provided with a fireproof cable sleeve device, and the fireproof cable sleeve device also comprises a water delivery cooling device for providing cooling water for the fireproof cable sleeve, wherein the fireproof cable sleeve device comprises a sleeve, an inner lining heat-insulating layer and a steel fiber outer layer, the sleeve is nested in the outer layer of the cable body, the inner lining heat-insulating layer is nested in the outer layer of the sleeve, the area between the steel fiber outer layer and the inner lining heat-insulating layer is divided into a plurality of pore channels through a ceramic ring frame, and a circle of pore channels close to the inner lining heat-insulating layer are uniformly distributed with condensed water pipes; the water outlet end of the water delivery cooling device is connected with the inlet end of the condensate pipe, and the water delivery cooling device comprises a water pump, a reservoir, a water delivery pipeline, a temperature sensor, a valve, a fire-fighting lance, a controller and the like. The utility model provides a cooling protection function for the stay cable on the basis of not changing the original function of the stay cable, and improves the fire resistance of the stay cable, thereby ensuring the safety coefficient of the bridge.
Description
Technical Field
The utility model belongs to the technical field of fire resistance of cable-stayed bridges, and particularly relates to a fire-proof device for a stay cable of a cable-stayed bridge.
Background
A cable-stayed bridge is also called a diagonal tension bridge, is a bridge with a main beam directly pulled on a bridge tower by a plurality of guys, and is a structural system formed by combining a pressure-bearing tower, a pulled guy and a bending-bearing beam body. The multi-span elastic support continuous beam mainly comprises a cable tower, a main beam and a stay cable, and can be regarded as a multi-span elastic support continuous beam with a stay cable replacing a buttress. It can reduce the bending moment in the beam body, reduce the building height, lighten the structural weight and save materials. Therefore, it is widely used in various parts of China.
As is well known, a cable is used as an upper structure of a cable-stayed bridge, and a cable body of the cable is generally a steel structure, is the most main stressed part of the cable-stayed bridge, bears the gravity of a bridge deck, and is safe in operation of the bridge and pedestrian and driving safety on the bridge. However, with the rapid development of the industry and the economic society of China, the connection among all regions is tighter and tighter, the traffic on the bridge is more and more busy, the traffic on the bridge of dangerous goods transportation vehicles is more and more frequent, and the cable-stayed bridge is more and more threatened by fire. In recent years, China has many major cable-stayed bridge fire accidents.
Engineering practice shows that although steel has good mechanical properties and application prospects, the fire resistance of the steel is poor, the mechanical properties of the steel are rapidly reduced at a high temperature of 400 ℃, and the elastic modulus of the steel is reduced to half of that at a high temperature of 600 ℃. The bridge using the steel structure as the main stress member is easy to deform or even collapse under fire. Especially transport dangerous goods tank car conflagration, the heat that jar body fuel burning produced makes the temperature of cable-stay bridge cable member rise rapidly, leads to the elastic modulus and the intensity of cable steel wire to descend by a wide margin on the one hand, and on the other hand makes the redistribution appear in the internal stress of cable, and then is broken by the snap more easily in the conflagration, if do not in time take rescue measures, causes the conflagration temperature to rise continuously, and local or holistic destruction will take place for the cable-stay bridge.
For example, chinese patent CN207259963U discloses a fireproof cable, which comprises a cable, an inner bushing, a fireproof layer and an outer bushing, wherein the fireproof layer is disposed between the inner bushing and the outer bushing; the fireproof layer is one of filling type fireproof materials or fireproof coatings, the stay cable only has a passive fireproof function, the protection effect is limited when a major fire disaster happens, the stay cable is matched with a fire-fighting function for fire extinguishment, and when the stay cable is in a remote area or the fire extinguishment is not timely, major life and property losses can be caused.
In view of the above, the present inventors have conducted a great deal of scientific research and experiments to develop a fire protection device for a cable of a cable-stayed bridge, so as to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a fireproof device for a stay cable of a cable-stayed bridge, which can actively cool and protect in time to ensure that the stay cable always works normally when a serious fire accident happens to the cable-stayed bridge, thereby reducing the damage risk in the fire of the cable-stayed bridge and reducing the loss of lives and properties of the masses.
In order to achieve the purpose, the utility model provides the following technical scheme:
a fire-proof device for a cable-stayed bridge cable comprises a cable body stretched between a bridge and a bridge tower, wherein a fire-proof cable sleeve device is arranged on the circumference of the cable body, and the fire-proof cable sleeve device also comprises a water delivery cooling device for providing cooling water for the fire-proof cable sleeve device;
the fireproof cable sleeve device comprises a sleeve, an inner lining heat-insulating layer and a steel fiber outer layer, wherein the sleeve is nested in the cable body outer layer, the inner lining heat-insulating layer is nested in the sleeve outer layer, the area between the steel fiber outer layer and the inner lining heat-insulating layer is divided into a plurality of pore channels through a ceramic ring frame, and condensed water pipes are uniformly distributed in a circle of pore channels close to the inner lining heat-insulating layer;
and the water outlet end of the water delivery cooling device is connected with the inlet end of the condensate pipe.
Furthermore, the water delivery cooling device comprises a water pump motor and a reservoir which are arranged below the bridge, the reservoir is communicated with a water delivery pipeline arranged on the cable tower, the water delivery pipeline is connected with a condensate pipe on the circumferential direction of each cable body, an electric control valve is arranged at each connection part, and a temperature sensor is arranged at the anchoring part of each cable body on the bridge floor;
the water delivery cooling device further comprises a controller, the controller is respectively connected with the water pump motor, the electric control valve and the temperature sensor, the controller is used for receiving signals detected by the temperature sensor in real time, and when the temperature signals monitored by the controller are larger than a set threshold value, the controller controls the water pump motor and the electric control valve to start to work; otherwise, the starting is not performed.
Furthermore, the water delivery cooling device also comprises a fire-fighting lance arranged at the top of the cable tower, and the fire-fighting lance is communicated with the water delivery pipeline;
the controller is connected with the control end of the fire-fighting lance and is used for controlling the orientation of the water outlet of the fire-fighting lance.
Furthermore, the water delivery cooling device also comprises a water temperature sensor arranged in the condensed water pipe, and the water temperature sensor is connected with the controller.
Further, the material of the sleeve is High Density Polyethylene (HDPE).
Further, the lining thermal insulation layer is made of aerogel.
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
the fireproof cable sleeve device is arranged on the circumference of the cable body and sequentially comprises a flame-retardant high-polyethylene (HDPE) sleeve, an aerogel lining heat-insulating layer, a condensate pipe, a high-temperature-resistant ceramic ring frame and a high-temperature-resistant steel fiber outer layer from inside to outside, wherein the high-temperature-resistant ceramic ring frame divides the area between the aerogel lining heat-insulating layer and the high-temperature-resistant steel fiber outer layer into a plurality of pore channels, the condensate pipe is arranged in a circle close to the aerogel lining heat-insulating layer, and the rest pore channels are used for air circulation to dissipate heat. In addition, the utility model is also provided with a water delivery cooling device which comprises a water pump motor, a reservoir, a water delivery pipeline, a temperature sensor, an electromagnetic valve, a fire-fighting lance, a controller and the like, through the arrangement of water delivery cooling, when a fire breaks out on the bridge floor, the temperature sensor can detect the current temperature of the bridge floor in real time and synchronously transmit signals to the controller, after the controller detects that the current temperature is greater than a set threshold value, the controller controls the water pump motor and the electromagnetic valve to be started, cooling water continuously cools the cable body through a condensate pipe, so that the cable body is always kept at a lower temperature, the safety and the stability of the cable-stayed bridge structure are ensured, and meanwhile, the controller adjusts the fire-fighting lance to spray water to the direction of a fire source, so as to extinguish the fire source in time and further ensure the overall safety of the cable-stayed bridge.
Drawings
FIG. 1 is a front view of the fireproof cable cover device for the stay cable of the cable-stayed bridge according to the present invention;
FIG. 2 is a three-dimensional structure view of the fireproof cable sheath device for the stay cable of the cable-stayed bridge according to the present invention;
FIG. 3 is a schematic structural view of a water delivery cooling device of a cable-stayed bridge according to the present invention;
FIG. 4 is a block diagram of the connection control of the water delivery cooling device of the present invention.
Wherein: 1 is a cable body; 2 is a sleeve; 3 is a lining heat insulation layer; 4 is a condensate pipe; 5 is a ceramic ring frame; 6 is a steel fiber outer layer; 7 is a water pump motor; 8 is a reservoir; 9 is a water delivery pipeline; 10 is an electric control valve; 11 is a temperature sensor; 12 is a controller; 13 is a fire-fighting lance; and 14 is a water temperature sensor.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the utility model, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
Referring to fig. 1 to 3, the fireproof device for the cable-stayed bridge cable comprises a cable body 1 stretched between a bridge and a bridge tower, wherein the cable body 1 is circumferentially provided with a fireproof cable sleeve device, and the fireproof cable sleeve device further comprises a water delivery cooling device for providing cooling water for the fireproof cable sleeve device, and after a fire condition occurs on a bridge floor, the cooling water is continuously provided into the fireproof cable sleeve device through the water delivery cooling device, so that the cable body in the center of the fireproof cable sleeve device is always kept at a low temperature, and the safety and stability of the integral structure of the cable-stayed bridge are ensured.
Specifically, as shown in fig. 1 and 2, the fireproof cable sleeve device comprises a sleeve 2 made of a flame-retardant high-polyethylene (HDPE) material, a lining thermal insulation layer 3 and a high-temperature-resistant steel fiber outer layer 6, the sleeve 2 is nested on the outer layer of the cable body 1, the lining thermal insulation layer 3 is nested on the outer layer of the sleeve 2, the area between the high-temperature-resistant steel fiber outer layer 6 and the lining thermal insulation layer 3 is divided into a plurality of channels through a high-temperature-resistant ceramic ring frame 5, the channels are divided in a staggered and spaced mode (similar to that shown in fig. 1), condensed water pipes 4 are evenly distributed in a circle of channels close to the lining thermal insulation layer 3, and the water outlet end of the water conveying and cooling device is connected with the inlet ends of the condensed water pipes 4.
Preferably, as shown in fig. 1 of the present embodiment, after the high temperature resistant ceramic ring frame 5 divides the pore into regions between the high temperature resistant steel fiber outer layer 6 and the lining thermal insulation layer 3 (only one of the preferable division methods is provided in the present embodiment), 12 condensate pipes 4 are uniformly distributed along one pore of the lining thermal insulation layer 3 to increase the contact area between the condensate pipe and the lining thermal insulation layer, so as to enhance the cooling effect of the cable body, preferably, the shell of the condensate pipe 4 is made of an anti-rust alloy with good thermal conductivity, and a large number of pores are present in the remaining pore, the ceramic ring frame and the steel fiber layer to facilitate air circulation for heat dissipation, and meanwhile, the direct fire reception of the inner layer of the cable sleeve can be avoided.
Preferably, the lining thermal insulation layer 3 is made of high-quality thermal insulation material aerogel.
As shown in fig. 3 and 4, the water delivery cooling device of the utility model comprises a water pump motor 7 and a reservoir 8 which are arranged below the bridge (if the bridge pier is in a lake or not far away from a water source, a water pump can directly pump water from the water source), the reservoir 8 is communicated with a water delivery pipeline 9 arranged on a cable-stayed bridge cable tower, the water delivery pipeline 9 is connected with a condensate pipe 4 on the circumference of each cable body 1, an electric control valve 10 is arranged at each connection, and a temperature sensor 11 is arranged at the anchoring position of the bridge floor of each cable body 1 and used for detecting the temperature around the bridge floor in real time.
Specifically, the water delivery cooling device further comprises a controller 12, wherein the controller 12 is respectively connected with the water pump motor 7, the electric control valve 10 and the temperature sensor 11, preferably, a wireless network connection mode is adopted, the controller is generally arranged below the cable-stayed bridge, and preferably, protective measures are adopted, such as building a protective house and the like, so that the controller is prevented from being damaged due to other conditions such as fire and the like. The controller 12 is used for receiving a signal of the temperature sensor 11 in real time, when the temperature signal monitored by the controller 12 is greater than a set threshold value, the controller 12 controls the water pump motor 7 and the electric control valve 10 to start, namely the water pump motor pumps cooling water in the water storage tank into a water pipeline, and then the electric control valve is opened to continuously send the cooling water into a condensed water pipe in the fireproof cable set, so that the cable body is timely cooled and protected, and the integral safety of the cable-stayed bridge is ensured; otherwise, the starting is not performed.
The water delivery cooling device also comprises a fire-fighting lance 13 arranged at the top of the cable tower, the fire-fighting lance 13 is communicated with the water delivery pipeline 9, and an electric control valve 10 is arranged at the joint; the controller 12 is connected with a control end of the fire-fighting lance 13 and is used for controlling the direction of a water outlet of the fire-fighting lance 13.
Preferably, the water delivery cooling device further comprises a water temperature sensor 14 arranged in the condensate pipe 4, the water temperature sensor is preferably arranged on one side of the bridge floor, and the water temperature sensor 14 is connected with the controller 12. The automatic water temperature control device is used for detecting the water temperature in the current condensed water pipe and synchronizing the water temperature to the controller, when the water temperature in a certain condensed water pipe is monitored to be too high, the electric control valve increases the water pressure in the condensed water pipe, so that the flow rate of water is accelerated, more heat is taken away, and the cooling efficiency is accelerated.
The utility model relates to an installation method of a fireproof device for a cable-stayed bridge cable, which comprises the following steps:
step one, installing a fireproof cable sleeve device in the circumferential direction of a cable body
The fireproof cable sleeve device for the stay cable is sleeved on a cable body in factory production, the cable body of an old bridge can be transformed, when the length of the cable body is larger than a certain distance (for example, 3 meters), the fireproof cable sleeve device can be installed in a segmented mode, and finally sealing treatment is carried out on a connecting position;
step two, after the cable-stayed bridge finishes the bridge deck pavement, installing a water delivery cooling device
Firstly, connecting a fire-fighting lance at the top of the cable tower and a condensate pipe in a fireproof cable sleeve with a water pipeline respectively, and installing an electric control valve at each connection part; then, a temperature sensor is arranged at the anchoring position of each cable body on the bridge floor, a water temperature sensor is arranged in the condensate pipe, and the water outlet end below the condensate pipe is connected with a drainage pipe of the bridge floor; finally, the water pump motor, the electric control valve, the temperature sensor, the water temperature sensor and the control end of the fire-fighting lance are respectively connected with the controller;
and step three, debugging and verifying to ensure that each installed part can work normally.
The installation method of the fireproof device for the stay cable of the cable-stayed bridge is simple, wherein the fireproof cable sleeve device and the stay cable body can be separated, so that the fireproof cable sleeve device is convenient to replace and maintain, and can be used for a new bridge or upgrading and reconstructing the existing old bridge stay cable.
The working mode of the utility model is as follows: firstly, the bridge floor temperature sensor 10 arranged around each stay cable anchor head on the bridge floor can detect the surrounding temperature in real time and synchronously transmit the temperature signal to the controller 12, after fire disaster occurs on the bridge floor of the cable-stayed bridge, the temperature signal monitored by the controller 12 is greater than a set threshold value, the controller 12 controls the water pump motor 7 and the electric control valve 10 to be started, the water pump motor 7 sends cooling water in the reservoir 8 to the opened electric control valve 10 and the tower top fire monitor 13 through the cable tower water pipeline 9, and the electric control valve 10 on one side of the cable tower fire source is completely opened. According to the temperature distribution diagram that bridge floor temperature sensor 11 detected (the temperature sensor signal that is close to the burning things which may cause a fire disaster is strong, keep away from weakening in proper order, the direction of burning things which may cause a fire disaster can be confirmed), controller 12 judges the burning things which may cause a fire disaster at bridge floor direction back, adjustment fire-fighting lance 13 water spray angle, towards the fire disaster water spray put out a fire, in the cable-stayed fireproof cable cover device near the fire disaster simultaneously, the continuous cooling water of going on a journey down through cable tower electric control valve 10 through 12 angle condensate pipe 4 along the cable direction, make the cable body 1 in the cable-stayed cable cover device maintain at lower temperature all the time, ensure the safety and the stability of cable-stayed bridge structure. Meanwhile, a water temperature sensor 14 is arranged in the 12-corner condensed water pipe near the bridge deck cable anchoring section, when the controller monitors that the water temperature in a certain condensed water pipe is too high, the electric control valve 10 at the position is correspondingly controlled to increase the water pressure in the condensed water pipe, so that the flow rate of water is accelerated, more heat is taken away, and the cooling efficiency is accelerated. According to the fireproof cable sleeve device, the high-density polyethylene (HDPE) sleeve 2 and the aerogel lining heat insulation layer 3 are arranged between the condensate pipe and the cable body, the aerogel is used as a high-quality heat insulation material, heat can be effectively prevented from being further conducted to the inside, even if a serious fire disaster happens, the cable body can still normally work, and therefore the safety coefficient of a bridge is guaranteed.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (6)
1. The fireproof device for the stay cable of the cable-stayed bridge is characterized by comprising a cable body (1) stretched between a bridge and a bridge tower, wherein a fireproof cable sleeve device is arranged on the cable body (1) in the circumferential direction, and the fireproof cable sleeve device also comprises a water delivery cooling device for providing cooling water for the fireproof cable sleeve device;
the fireproof cable sleeve device comprises a sleeve (2), a lining heat-insulating layer (3) and a steel fiber outer layer (6), wherein the sleeve (2) is nested on the outer layer of the cable body (1), the lining heat-insulating layer (3) is nested on the outer layer of the sleeve (2), the area between the steel fiber outer layer (6) and the lining heat-insulating layer (3) is divided into a plurality of pore channels through a ceramic ring frame (5), and condensed water pipes (4) are uniformly distributed in a circle of pore channels close to the lining heat-insulating layer (3);
the water outlet end of the water delivery cooling device is connected with the inlet end of the condensate pipe (4).
2. The fireproof device for the cable-stayed bridge cable according to claim 1, wherein the water delivery cooling device comprises a water pump motor (7) and a reservoir (8) which are arranged below the bridge, the reservoir (8) is communicated with a water delivery pipeline (9) arranged on a cable tower, the water delivery pipeline (9) is connected with a condensate pipe (4) on the circumferential direction of each cable body (1), an electric control valve (10) is arranged at each connection, and a temperature sensor (11) is arranged at the anchoring position of the bridge deck of each cable body (1);
the water delivery cooling device further comprises a controller (12), the controller (12) is respectively connected with the water pump motor (7), the electric control valve (10) and the temperature sensor (11), the controller (12) is used for receiving signals detected by the temperature sensor (11) in real time, and when the temperature signals monitored by the controller (12) are larger than a set threshold value, the controller (12) controls the water pump motor (7) and the electric control valve (10) to start to work; otherwise, the starting is not performed.
3. The fire protection device for the cable-stayed bridge cable according to claim 2, characterized in that the water delivery cooling device further comprises a fire-fighting lance (13) installed at the top of the cable tower, the fire-fighting lance (13) is communicated with the water delivery pipeline (9);
the controller (12) is connected with the control end of the fire-fighting lance (13) and is used for controlling the direction of a water outlet of the fire-fighting lance (13).
4. The fire protection device for the cable-stayed bridge cable according to claim 2, characterized in that the water delivery cooling device further comprises a water temperature sensor (14) arranged in the condensate pipe (4), and the water temperature sensor (14) is connected with the controller (12).
5. A fire-protection arrangement for a cable-stayed bridge cable according to claim 1, characterised in that the material of the sleeve (2) is High Density Polyethylene (HDPE).
6. A fire protection device for a cable-stayed bridge cable according to claim 1, characterised in that the lining insulation (3) is made of aerogel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120654427.9U CN215441399U (en) | 2021-03-31 | 2021-03-31 | Fire-proof device for cable-stayed bridge inhaul cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120654427.9U CN215441399U (en) | 2021-03-31 | 2021-03-31 | Fire-proof device for cable-stayed bridge inhaul cable |
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| CN215441399U true CN215441399U (en) | 2022-01-07 |
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| CN202120654427.9U Active CN215441399U (en) | 2021-03-31 | 2021-03-31 | Fire-proof device for cable-stayed bridge inhaul cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112900245A (en) * | 2021-03-31 | 2021-06-04 | 长安大学 | Fireproof device for cable-stayed bridge inhaul cable and installation method thereof |
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2021
- 2021-03-31 CN CN202120654427.9U patent/CN215441399U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112900245A (en) * | 2021-03-31 | 2021-06-04 | 长安大学 | Fireproof device for cable-stayed bridge inhaul cable and installation method thereof |
| CN112900245B (en) * | 2021-03-31 | 2024-06-04 | 长安大学 | Fireproof device for cable-stayed bridge stay cable and installation method thereof |
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