Bridge anchor head fireproof cover and manufacturing method

Abstract

The application relates to the technical field of anchor head fireproof covers, and discloses a bridge anchor head fireproof cover and a manufacturing method. The bridge anchor head fireproof cover comprises an anchor cylinder, a guide seat is fixedly installed at the tail of the anchor cylinder, a group of expansion frames in a circumferential array are slidably connected in the guide seat, an expansion pipe parallel to the anchor cylinder is fixedly installed on the surface of each expansion frame, a transmission part is installed on the inner wall of the guide seat, a driving ring is in transmission connection with the circumferential surface of the transmission part, and a connecting arm is hingedly connected between the opposite surfaces of each expansion frame and the driving ring. When the anchor head is subjected to the fireproof operation, the fireproof distance between the fireproof cylinder cover and the anchor cylinder and the filling amount of the fire-retardant liquid can be increased to improve the fireproof effect of the bridge anchor cylinder when the fire occurs.

Description

Technical Field

[0001] This invention relates to the field of anchor head fireproof cover technology, specifically to a bridge anchor head fireproof cover and its manufacturing method. Background Technology

[0002] The cable anchorage structure is also a key load-bearing structure of the bridge. If the anchor head is damaged under high temperature or explosive impact, the cable strength will decrease and the cable anchorage effect will be reduced, which will threaten the safety of the bridge structure.

[0003] In the prior art, patent document CN216074740U discloses a bridge cable anchor head protection device, including a cover and a fixing device installed on the cover. The cover includes a sleeve and a cover plate that seals one end of the sleeve. The sleeve includes an outer shell and an inner liner fitted inside the outer shell, forming a hollow interlayer. The hollow interlayer is filled with fireproof and heat-insulating material. The fixing device is used to fix the cover to the outside of the anchor head. The above device sets the sleeve of the cover to have a hollow interlayer structure and fills the hollow interlayer with fireproof and heat-insulating material, thereby achieving a good heat insulation effect and avoiding damage to the anchor head caused by high temperature or other impacts, thus affecting the stability of the structure. However, when the above device is used for fire protection of the anchor head, it is not convenient to improve the fire protection effect of the bridge anchor head by increasing the heat insulation and fire protection distance between the fireproof cover and the anchor cylinder and increasing the filling amount of flame retardant liquid in the event of a fire. Based on this, the present invention provides a bridge anchor head fireproof cover and manufacturing method to solve the technical problems mentioned in the background art. Summary of the Invention

[0004] The purpose of this invention is to provide a fireproof cover for bridge anchor heads and a manufacturing method thereof, which solves the problem that existing devices in the background art are not convenient for improving the fireproof effect of bridge anchor heads by increasing the heat insulation and fireproof distance between the fireproof cover and the anchor head and the amount of flame retardant liquid filling when a fire occurs.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A fireproof cover for a bridge anchor head includes an anchor cylinder. A guide seat is fixedly installed at the tail of the anchor cylinder. A set of expansion frames arranged in a circular array are slidably connected inside the guide seat. A propulsion tube arranged parallel to the anchor cylinder is fixedly installed on the surface of each expansion frame. A transmission component is installed on the inner wall of the guide seat. A drive ring is drivenly connected to the circumferential side of the transmission component. A connecting arm is hinged between the opposite surface of each expansion frame and the drive ring. A cylindrical cover is provided on the outer side of the anchor cylinder. Two symmetrically arranged corrugated ring plates are fixedly installed between the cylindrical cover and the opposite surface of the anchor cylinder. A first filling cavity is also provided between the cylindrical cover and the opposite surface of the anchor cylinder. An electrical control component, an anchor cable component, and a pressure-reducing mechanism communicating with the first filling cavity and the propulsion tube are respectively installed inside the anchor cylinder. The pressure-reducing mechanism is driven by the drive ring.

[0007] Preferably, the anchor cable assembly includes a main cable body and a clamp fixed to the inner wall of the anchor cylinder. The tail of the main cable body is connected to a group of branch cables arranged in a circumferential array. The clamp has a positioning clamp hole inside the clamp corresponding to the position of each branch cable. The inner wall of each positioning clamp hole is fitted with two symmetrically arranged wedge-shaped sleeves that are connected to each other by nuts. A clamping cavity that cooperates with the branch cable is fixed between the opposite surfaces of the two wedge-shaped sleeves.

[0008] Preferably, the transmission component includes a motor fixed to the tail of the guide seat, a transmission screw fixedly mounted on the output shaft end of the motor, the peripheral side of the transmission screw being connected to the drive ring, and a guide groove that is slidably connected to the extension frame is provided inside the guide seat corresponding to the position of each extension frame.

[0009] Preferably, the cylindrical cover and the two corrugated ring plates are made of metal. A set of corrugated parts arranged in a circumferential array are fixedly provided on the surface of the cylindrical cover. Each corrugated part has a corrugated groove inside. The number of corrugated parts is the same as the number of extension frames. A set of corrugated parts and a set of extension frames are arranged in pairs on the outside of the cylindrical cover.

[0010] Preferably, the electronic control components include an inner temperature probe fixed to the anchor cylinder axis and an outer temperature probe fixed to the tail of the guide seat. The guide seat has a built-in microcontroller, a battery, and a remote data transmission module. The ports of the inner temperature probe, the outer temperature probe, the battery, and the remote data transmission module are all electrically connected to the microcontroller.

[0011] Preferably, the pressure replenishment mechanism includes a linkage frame and a second filling cavity opened inside the anchor cylinder. The anchor cylinder has a set of through holes arranged in a circumferential array inside. The circumferential side of the second filling cavity is connected to the first filling cavity through a set of through holes. Both the first and second filling cavities are filled with heat-insulating and flame-retardant liquid. A piston ring is slidably connected to the inner wall of the second filling cavity. A set of guide rods is fixedly installed on the back of the piston ring. The circumferential side of each guide rod is slidably connected to the anchor cylinder. The tail end of the guide rod is fixedly connected to the linkage frame. The surface of the linkage frame is linked to the drive ring through a differential module. An injection assembly connected to the expansion tube is installed between the guide rod and the opposite surface of the anchor cylinder.

[0012] Preferably, the differential module includes a coupling rotatably connected to the inner wall of the anchor cylinder. A first differential gear and a second differential gear are fixedly mounted on the circumferential side of the coupling. A transmission gear frame is fixedly mounted on the surface of the drive ring. The circumferential side of the transmission gear frame is connected to the first differential gear. A driven gear frame is fixedly mounted on the surface of the linkage frame. The circumferential side of the driven gear frame is connected to the second differential gear. The transmission gear frame and the driven gear frame are respectively located on both sides of the coupling.

[0013] Preferably, the liquid injection assembly includes a liquid storage bladder fixed between the guide rod and the anchor cylinder, a liquid spray channel is fixedly opened inside the expansion tube, the tail end of the liquid storage bladder is connected to the liquid spray channel through a hose, the liquid storage bladder stores flame retardant liquid inside, and a set of liquid spray holes with the liquid outlet direction facing the cylinder cover are opened inside the expansion tube, and the tail end of the liquid spray hole is fixedly connected to the liquid spray channel.

[0014] Preferably, multiple sets of retaining rings arranged in a circular array are fixedly installed on the circumferential side of the cylinder cover. Each retaining ring has a dry powder tube attached to its inner wall. The dry powder tube stores dry powder extinguishing agent inside and is made of plastic.

[0015] Preferably, a method for manufacturing a fireproof cover for a bridge anchor head includes the following steps:

[0016] SS01, Pre-assembly: Before manufacturing a fireproof cover for a bridge anchor head, pre-manufacturing expansion tubes, main cables, anchor cylinders, and cover components with specified specifications and dimensions, and assembling them in sequence after the above components are prepared;

[0017] After steps SS02 and SS01, a set of expansion tubes is fully retracted. After the set of expansion tubes is fully retracted, sufficient heat-insulating and flame-retardant liquid is filled into the first filling cavity and the second filling cavity. Sufficient flame-retardant liquid is stored in the liquid storage bladder. Dry powder tubes are assembled on each retaining ring, thereby completing the manufacturing of a bridge anchor head fireproof cover.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] 1. When performing fire prevention work on anchor heads, this device can improve the fire prevention effect of bridge anchors by increasing the heat insulation and fire prevention distance between the fireproof cover and the anchor tube and the amount of flame retardant liquid filling in the event of a fire.

[0020] 2. In this invention, when the monitored value of the external temperature probe is lower than the set threshold, the cylinder cover fully retracts under the drive of the motor, thereby effectively reducing the volume occupied by the cylinder cover. When the monitored value of the external temperature probe is higher than the set threshold, the cylinder cover fully extends under the drive of the motor, thereby effectively increasing the relative distance between the cylinder cover and the anchor cylinder. This increases the fireproof effect of the anchor cylinder by increasing the heat insulation and fireproof distance between the cylinder cover and the anchor cylinder. Furthermore, when the heat insulation and fireproof distance between the cylinder cover and the anchor cylinder increases, the filling amount and filling thickness of the heat insulation and flame retardant liquid inside the first filling cavity can be increased simultaneously, thereby effectively improving the heat insulation and fireproof strength of the anchor cylinder. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a fireproof cover for a bridge anchor head;

[0022] Figure 2 for Figure 1 A magnified schematic diagram of the local structure at point A;

[0023] Figure 3 This is a schematic diagram of the guide seat and the external temperature probe.

[0024] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure;

[0025] Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point B;

[0026] Figure 6 for Figure 4 A magnified schematic diagram of the structure at point C in the middle;

[0027] Figure 7 for Figure 4 A magnified schematic diagram of the local structure at point D;

[0028] Figure 8 This is a structural diagram of the expansion frame and expansion tube.

[0029] The components are as follows: 1. Anchor cylinder; 2. Guide seat; 3. Extension frame; 4. Expansion tube; 5. Transmission component; 6. Drive ring; 7. Connecting arm; 8. Cylinder cover; 9. Corrugated ring plate; 10. First filling cavity; 11. Main cable body; 12. Clamping seat; 13. Branch cable body; 14. Wedge-shaped sleeve; 15. Corrugated part; 16. Internal temperature probe; 17. External temperature probe; 18. Microcontroller; 19. Second filling cavity; 20. Through hole; 21. Piston ring; 22. Guide rod; 23. Linkage frame; 24. First differential gear; 25. Second differential gear; 26. Transmission gear frame; 27. Driven gear frame; 28. Liquid storage bladder; 29. ​​Spray hole; 30. Snap ring; 31. Dry powder tube. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-8 A fireproof cover for a bridge anchor head includes an anchor cylinder 1. A guide seat 2 is fixedly installed at the tail of the anchor cylinder 1. A set of expansion frames 3 arranged in a circular array are slidably connected inside the guide seat 2. An expansion tube 4 arranged parallel to the anchor cylinder 1 is fixedly installed on the surface of each expansion frame 3. A transmission component 5 is installed on the inner wall of the guide seat 2. A drive ring 6 is connected to the peripheral side of the transmission component 5. A connecting arm 7 is hinged between the opposite surface of each expansion frame 3 and the drive ring 6.

[0032] The transmission component 5 includes a motor fixed to the tail of the guide seat 2. A transmission screw is fixedly installed on the output shaft end of the motor. The peripheral side of the transmission screw is connected to the drive ring 6. The guide seat 2 has a guide groove that is slidably connected to the extension frame 3 inside and corresponding to the position of each extension frame 3.

[0033] An outer cover 8 is provided on the outside of the anchor cylinder 1, and two symmetrically arranged corrugated ring plates 9 are fixedly installed between the outer cover 8 and the opposite surface of the anchor cylinder 1.

[0034] Both the cylindrical cover 8 and the two corrugated ring plates 9 are made of metal.

[0035] A set of corrugated parts 15 arranged in a circular array is fixedly provided on the surface of the cylindrical cover 8. Each corrugated part 15 has a corrugated groove inside. The number of corrugated parts 15 is the same as the number of extension frames 3. A set of corrugated parts 15 and a set of extension frames 3 are arranged in pairs on the outside of the cylindrical cover 8.

[0036] A first filling cavity 10 is provided between the opposing surfaces of the sleeve 8 and the anchor cylinder 1. The anchor cylinder 1 is equipped with an electrical control component that cooperates with the transmission component 5, an anchor cable component, and a pressure-reducing mechanism that communicates with the first filling cavity 10 and the expansion tube 4. The pressure-reducing mechanism is driven by the drive ring 6.

[0037] The anchor cable assembly includes a main cable body 11 and a clamp 12 fixed to the inner wall of the anchor cylinder 1. The tail of the main cable body 11 is connected to a group of branch cables 13 arranged in a circular array. The clamp 12 has positioning clamping holes inside, corresponding to the position of each branch cable 13. The inner wall of each positioning clamping hole is fitted with two symmetrically arranged wedge-shaped sleeves 14 connected to each other by nuts. A clamping cavity that cooperates with the branch cable 13 is fixedly provided between the opposite surfaces of the two wedge-shaped sleeves 14.

[0038] The electrical control components include an inner temperature probe 16 fixed to the axis of the anchor cylinder 1 and an outer temperature probe 17 fixed to the tail of the guide seat 2. The guide seat 2 has a built-in microcontroller 18, a battery and a remote data transmission module. The ports of the inner temperature probe 16, the outer temperature probe 17, the battery and the remote data transmission module are all electrically connected to the microcontroller 18.

[0039] During operation, the internal temperature probe 16 is used to monitor the temperature data inside the anchor cylinder 1 in real time;

[0040] External temperature probe 17 is used to monitor the temperature data outside the anchor cylinder 1 in real time;

[0041] The internal temperature probe 16 and the external temperature probe 17 feed back the monitored real-time data to the microcontroller 18. The microcontroller 18 controls the working state of the motor and the expansion range of the cylinder cover 8 based on the data feedback from the internal temperature probe 16 and the external temperature probe 17.

[0042] When the monitored value of the external temperature probe 17 is lower than the set threshold, the cylinder cover 8 fully retracts under the drive of the motor, thereby effectively reducing the volume occupied by the cylinder cover 8.

[0043] When the monitored value of the external temperature probe 17 is higher than the set threshold, the cylinder cover 8 fully extends outward under the drive of the motor, thereby effectively increasing the relative distance between the cylinder cover 8 and the anchor cylinder 1, and then improving the fireproof effect of the anchor cylinder 1 by increasing the heat insulation and fireproof distance between the cylinder cover 8 and the anchor cylinder 1.

[0044] The remote data transmission module is used to transmit the data received by the microcontroller 18 to an external monitoring terminal in real time.

[0045] The internal temperature probe 16, external temperature probe 17, battery, and remote data transmission module can all be customized or selected according to actual needs;

[0046] The pressure replenishment mechanism includes a linkage frame 23 and a second filling cavity 19 opened inside the anchor cylinder 1. A set of through holes 20 arranged in a circular array are opened inside the anchor cylinder 1. The peripheral side of the second filling cavity 19 is connected to the first filling cavity 10 through a set of through holes 20. Both the first filling cavity 10 and the second filling cavity 19 are filled with heat-insulating and flame-retardant liquid.

[0047] The heat insulation and flame retardant liquid is a nano-silicon flame retardant and heat insulation liquid;

[0048] A piston ring 21 is slidably connected to the inner wall of the second filling cavity 19. A set of guide rods 22 are fixedly installed on the back of the piston ring 21. The circumferential side of each guide rod 22 is slidably connected to the anchor cylinder 1. The tail end of the guide rod 22 is fixedly connected to the linkage frame 23. The surface of the linkage frame 23 is linked to the drive ring 6 through the differential module. An injection assembly communicating with the expansion tube 4 is installed between the relative surface of each guide rod 22 and the anchor cylinder 1.

[0049] The differential module includes a coupling rotatably connected to the inner wall of the anchor cylinder 1. A first differential gear 24 and a second differential gear 25 are fixedly mounted on the circumferential side of the coupling. A transmission gear frame 26 is fixedly mounted on the surface of the drive ring 6. The circumferential side of the transmission gear frame 26 is connected to the first differential gear 24. A driven gear frame 27 is fixedly mounted on the surface of the linkage frame 23. The circumferential side of the driven gear frame 27 is connected to the second differential gear 25. The transmission gear frame 26 and the driven gear frame 27 are respectively located on both sides of the coupling.

[0050] The liquid injection assembly includes a liquid storage bladder 28 fixed between the guide rod 22 and the anchor tube 1. A liquid spraying channel is fixedly opened inside the expansion tube 4. The tail end of the liquid storage bladder 28 is connected to the liquid spraying channel through a hose. The liquid storage bladder 28 stores flame retardant liquid. A set of liquid spraying holes 29 with the liquid outlet direction facing the cylinder cover 8 are opened inside the expansion tube 4. The tail end of the liquid spraying holes 29 is fixedly connected to the liquid spraying channel.

[0051] Multiple sets of retaining rings 30 arranged in a circular array are fixedly installed on the circumferential side of the cylinder cover 8. Each retaining ring 30 has a dry powder tube 31 attached to its inner wall. The dry powder tube 31 stores dry powder extinguishing agent inside and is made of plastic.

[0052] A method for manufacturing a fireproof cover for a bridge anchor head includes the following steps:

[0053] SS01, Pre-assembly: Before manufacturing a fireproof cover for a bridge anchor head, pre-manufacture components with specified specifications and dimensions, including expansion tube 4, main cable body 11, anchor cylinder 1, and cylinder cover 8, and assemble them in sequence.

[0054] After steps SS02 and SS01, a set of expansion tubes 4 are fully retracted. After the set of expansion tubes 4 are fully retracted, sufficient heat-insulating and flame-retardant liquid is filled into the first filling cavity 10 and the second filling cavity 19. Sufficient flame-retardant liquid is stored in the liquid storage bladder 28. Dry powder tubes 31 are assembled on each retaining ring 30, thereby completing the manufacturing of a bridge anchor head fireproof cover.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fireproof cover for a bridge anchor head, comprising an anchor cylinder (1), characterized in that: A guide seat (2) is fixedly installed at the tail of the anchor cylinder (1). A set of expansion frames (3) arranged in a circular array are slidably connected inside the guide seat (2). Each expansion frame (3) has a support tube (4) fixedly installed on its surface, which is parallel to the anchor cylinder (1). A transmission component (5) is installed on the inner wall of the guide seat (2). A drive ring (6) is connected to the circumferential side of the transmission component (5). A connecting arm (7) is hinged between the opposite surfaces of each expansion frame (3) and the drive ring (6). An outer casing (8) is provided on the outside of the anchor cylinder (1). Two symmetrically arranged corrugated ring plates (9) are fixedly installed between the outer casing (8) and the opposite surface of the anchor cylinder (1). A first filling cavity (10) is also provided between the outer casing (8) and the opposite surface of the anchor cylinder (1). An electrical control component, an anchor cable component, and a pressure-replenishing mechanism that communicate with the first filling cavity (10) and the expansion tube (4) are respectively installed inside the anchor cylinder (1). The pressure-replenishing mechanism is driven by a drive ring (6). The electrical control components include an inner temperature probe (16) fixed at the axis of the anchor cylinder (1) and an outer temperature probe (17) fixed at the tail of the guide seat (2). The guide seat (2) has a built-in microcontroller (18), a battery and a remote data transmission module. The ports of the inner temperature probe (16), the outer temperature probe (17), the battery and the remote data transmission module are all electrically connected to the microcontroller (18). The pressure replenishment mechanism includes a linkage frame (23) and a second filling cavity (19) opened inside the anchor tube (1). The anchor tube (1) has a set of through holes (20) arranged in a circular array inside. The circumferential side of the second filling cavity (19) is connected to the first filling cavity (10) through a set of through holes (20). The first filling cavity (10) and the second filling cavity (19) are both filled with heat-insulating and flame-retardant liquid. The inner wall of the second filling cavity (19) is slidably connected with a piston ring (21). A set of guide rods (22) are fixedly installed on the back of the piston ring (21). The circumferential side of each guide rod (22) is slidably connected to the anchor tube (1). The tail end of the guide rod (22) is fixedly connected to the linkage frame (23). The surface of the linkage frame (23) is linked with the drive ring (6) through a differential module. An injection assembly connected to the expansion tube (4) is installed between the relative surfaces of each guide rod (22) and the anchor tube (1).

2. A fireproof cover for a bridge anchor head according to claim 1, characterized in that: The anchor cable assembly includes a main cable body (11) and a clamp (12) fixed to the inner wall of the anchor tube (1). The tail of the main cable body (11) is connected to a set of branch cables (13) arranged in a circular array. The clamp (12) has a positioning clamp hole inside and corresponding to the position of each branch cable (13). The inner wall of each positioning clamp hole is fitted with two symmetrically arranged wedge-shaped sleeves (14) connected to each other by nuts. A clamp cavity that cooperates with the branch cable (13) is fixedly provided between the opposite surfaces of the two wedge-shaped sleeves (14).

3. A fireproof cover for a bridge anchor head according to claim 1, characterized in that: The transmission component (5) includes a motor fixed to the tail of the guide seat (2), and a transmission screw is fixedly installed on the output shaft end of the motor. The peripheral side of the transmission screw is connected to the drive ring (6) for transmission. The guide seat (2) has a guide groove that is slidably connected to the extension frame (3) inside and corresponding to the position of each extension frame (3).

4. A fireproof cover for a bridge anchor head according to claim 1, characterized in that: The cylindrical cover (8) and the two corrugated ring plates (9) are both made of metal. A set of corrugated parts (15) arranged in a circular array are fixedly provided on the surface of the cylindrical cover (8). Each corrugated part (15) has a corrugated groove inside. The number of corrugated parts (15) is the same as the number of extension frames (3). A set of corrugated parts (15) and a set of extension frames (3) are arranged in pairs on the outside of the cylindrical cover (8).

5. A fireproof cover for a bridge anchor head according to claim 1, characterized in that: The differential module includes a coupling rotatably connected to the inner wall of the anchor cylinder (1). A first differential gear (24) and a second differential gear (25) are fixedly installed on the circumferential side of the coupling. A transmission gear frame (26) is fixedly installed on the surface of the drive ring (6). The circumferential side of the transmission gear frame (26) is connected to the first differential gear (24). A driven gear frame (27) is fixedly installed on the surface of the linkage frame (23). The circumferential side of the driven gear frame (27) is connected to the second differential gear (25). The transmission gear frame (26) and the driven gear frame (27) are respectively located on both sides of the coupling.

6. A fireproof cover for a bridge anchor head according to claim 5, characterized in that: The liquid injection assembly includes a liquid storage bladder (28) fixed between the guide rod (22) and the anchor tube (1). The inside of the expansion tube (4) is fixedly provided with a liquid spray channel. The tail of the liquid storage bladder (28) is connected to the liquid spray channel through a hose. The inside of the liquid storage bladder (28) stores flame retardant liquid. The inside of the expansion tube (4) is provided with a set of liquid spray holes (29) with the liquid outlet direction facing the cylinder cover (8). The tail end of the liquid spray holes (29) is fixedly connected to the liquid spray channel.

7. A fireproof cover for a bridge anchor head according to claim 1, characterized in that: The circumferential side of the cylinder cover (8) is fixedly installed with multiple sets of retaining rings (30) arranged in a circular array. Each retaining ring (30) has a dry powder tube (31) attached to its inner wall. The dry powder tube (31) stores dry powder extinguishing agent inside and is made of plastic.

8. A method for manufacturing a fireproof cover for a bridge anchor head according to any one of claims 1-7, characterized in that, Includes the following steps: SS01, Pre-assembly: Before manufacturing a fireproof cover for a bridge anchor head, pre-manufacture components with specified specifications and dimensions, including expansion tube (4), main cable body (11), anchor cylinder (1), and cylinder cover (8), are prepared and then assembled in sequence. After the SS02 and SS01 steps, a set of expansion tubes (4) are fully retracted. After the set of expansion tubes (4) are fully retracted, sufficient heat-insulating and flame-retardant liquid is filled into the first filling cavity (10) and the second filling cavity (19). Sufficient flame-retardant liquid is stored in the liquid storage bladder (28). Dry powder tubes (31) are assembled on each retaining ring (30), and then the manufacturing of a bridge anchor head fireproof cover is completed.

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