Large-span steel truss with fire-fighting function

Abstract

The large-span steel truss with the fire-fighting function comprises a steel truss main body, a fire-fighting assembly is arranged on the steel truss main body, and the fire-fighting assembly can automatically extinguish a place where a fire disaster happens accidentally. The fire-fighting assembly comprises a first water sprayer arranged on the lower end face of the steel truss body and a high-pressure water pipe arranged on the inner side of the steel truss body, and a fixing frame is arranged on the high-pressure water pipe and connected with the steel truss body. Through the arrangement of the fire-fighting assembly, a fire in a building built by the steel truss main body can be automatically extinguished, so that the problem of fire spreading caused by the fact that the fire in the building built by the steel truss main body cannot be found in time can be avoided; in addition, water spraying and cooling can be conducted on the steel truss main body when fire extinguishment is conducted, so that the fire resistance of the steel truss main body can be improved, and the repair and maintenance cost required by damage caused by baking of the steel truss main body due to the fire can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of large-span steel trusses, in particular to a large-span steel truss with fire-fighting function. Background Art

[0002] A long-span steel truss is a structural form made of steel, primarily used to support large buildings or structures across large distances. It boasts high strength, lightweight construction, and high efficiency. A steel truss is constructed from several members (usually steel) connected in a specific pattern to form a framework with a strong load-bearing capacity.

[0003] At present, the large-span steel trusses only play a supporting role for the constructed buildings. If a fire occurs inside the building constructed with the large-span steel trusses, it needs to be discovered and extinguished manually. If the fire occurs in the large-span steel trusses and cannot be discovered in time, the fire will spread inside the building constructed with the large-span steel trusses. The spread of the fire will cause great economic losses to the building constructed with the large-span steel trusses. If the fire spreads seriously, it will also affect the buildings near the building constructed with the large-span steel trusses. Summary of the Invention

[0004] The purpose of this application is to provide a large-span steel truss with fire-fighting function to solve the problems raised by the above-mentioned background technology.

[0005] In the first aspect, the present application provides a large-span steel truss with fire-fighting function, which adopts the following technical solution: it includes a steel truss body, on which a fire-fighting component is provided, and the fire-fighting component can automatically extinguish an accidental fire inside a building constructed by the steel truss body.

[0006] The above technical solution can automatically extinguish a fire that occurs inside a building constructed by a steel truss main body through the provision of fire-fighting components, thereby avoiding the problem of fire spreading due to failure to detect a fire that occurs inside a building constructed by a steel truss main body in time; in addition, water can be sprayed on the steel truss main body to cool it down during the fire extinguishing process, thereby improving the fire resistance of the steel truss main body and reducing the cost of repair and maintenance required due to damage to the steel truss main body caused by the fire.

[0007] Preferably, the fire-fighting assembly includes a first sprinkler arranged on the lower end surface of the steel truss body and a high-pressure water pipe arranged on the inner side of the steel truss body, the high-pressure water pipe is provided with a fixing frame, the fixing frame is connected to the steel truss body, the high-pressure water pipe is provided with a connecting water pipe, the end of the connecting water pipe away from the high-pressure water pipe is connected to the first sprinkler, one end of the high-pressure water pipe is connected to a delivery water pipe, and one end of the delivery water pipe is provided with a water pump.

[0008] Preferably, the upper end face of the high-pressure water pipe is provided with a connecting block, and the connecting block is sleeved on the steel truss body. The high-pressure water pipe is provided with a start button, and the start button is located on one side of the first sprinkler. An air bag is provided below the start button, and the positions of the start button and the air bag correspond to each other. The air bag is provided at the bottom end of the inner side of the steel truss body, and a limiting groove is provided on the upper end face of the first sprinkler.

[0009] The above technical solution, through the arrangement of airbags that expand when heated, can start a water pump to pump water from the water source to the fire site to extinguish the fire in time when the temperature inside the building constructed by the steel truss body rises sharply.

[0010] Preferably, the upper end surface of the first water sprinkler is provided with a movable plate, and the lower end surface of the movable plate is provided with a limiting plate, and the limiting plate is slidably connected to the limiting groove on the first water sprinkler, and a group of push plates are provided on both sides of the upper end surface of the movable plate, and each group of push plates has two push plates, and the positions of the two push plates correspond to each other. A second water sprinkler is rotatably provided at one end of the push plate away from the movable plate, and the second water sprinkler is rotatably connected to the first water sprinkler.

[0011] Preferably, a support frame is provided on the upper end surface of the first sprinkler, and the support frame is located above the movable plate. A servo motor is provided on the upper end surface of the support frame, and a turntable is rotatably provided on the top inner side of the support frame. The output end of the servo motor is connected to the turntable, and the servo motor and the water pump are electrically connected to the start button.

[0012] Preferably, a transmission gear ring is provided on the turntable, the transmission gear ring is an open ring, and the transmission gear ring is a quarter gear ring. Tooth plates are provided on both sides of the turntable, and the two ends of the tooth plates are connected to the two inner wall surfaces of the steel truss body.

[0013] The above technical solution, through the arrangement of the support frame, servo motor, turntable, transmission gear ring and gear plate, enables the first sprinkler to move horizontally back and forth on the lower end surface of the first sprinkler, thereby increasing the fire extinguishing range of the first sprinkler and thus improving the fire extinguishing effect.

[0014] Preferably, the lower end surface of the turntable is provided with a protrusion, the upper end surface of the movable plate is provided with a fixed horizontal plate, the upper end surface of the fixed horizontal plate is provided with a sinking groove, and one end of the protrusion on the turntable is inserted into the sinking groove on the upper end surface of the fixed horizontal plate.

[0015] The above technical solution enables the second sprinkler to perform circular reciprocating flipping motion through the arrangement of a servo motor, a turntable, a protrusion, a fixed horizontal plate, a sinking groove, a limit groove, a movable plate, and a limit plate. The second sprinkler performing circular reciprocating flipping motion can expand the water cooling of the steel truss main body, thereby reducing the risk of the steel truss main body being baked by fire, resulting in reduced strength, reduced elastic modulus, poor toughness, overall deformation, and damage to support connections.

[0016] On the second aspect, the present application provides a large-span steel truss with fire-fighting function, which adopts the following technical solution: a monitoring component is provided on the steel truss body, and the monitoring component includes a connecting frame arranged on the lower end face of the steel truss body, and a fixed gear and a half gear are rotatably provided on the inner side of the connecting frame, and the fixed gear is located above the half gear, and the fixed gear is meshed with the half gear. A driving motor is provided on the connecting frame, and the output end of the driving motor is connected to the fixed gear. A connecting rod is provided on the lower end face of the half gear, and a monitoring camera is provided at one end of the connecting rod.

[0017] The above technical solution, through the setting of the monitoring component, can not only monitor the fire situation inside the building constructed by the steel truss body, but also adjust the monitoring angle, so that the monitoring component has a larger monitoring range.

[0018] Preferably, the cross section of the limiting groove is an isosceles trapezoid, and the limiting plate is adapted to the shape and size of the limiting groove.

[0019] In summary, this application has the following beneficial technical effects: 1. The fire-fighting components can be set up to extinguish fires inside buildings constructed by steel trusses, thus avoiding the problem of fires not being discovered in time and causing the fire to spread. In addition, water can be sprayed on the steel trusses to cool them down during the fire extinguishing process, thus improving the fire resistance of the steel trusses and reducing the cost of repairs and maintenance due to damage to the steel trusses caused by fire. 2. The airbag that expands when heated can start the water pump to put out the fire in time when the temperature inside the building constructed by the steel truss body rises sharply; 3. The first sprinkler can move horizontally back and forth on the lower end surface of the first sprinkler through the arrangement of the support frame, servo motor, turntable, transmission gear ring, and gear plate, thereby increasing the fire extinguishing range of the first sprinkler and improving the fire extinguishing effect; 4. The second sprinkler is made to perform circular reciprocating flipping motion by means of the servo motor, turntable, protrusion, fixed horizontal plate, sinking groove, limit groove, movable plate and limit plate. The second sprinkler performing circular reciprocating flipping motion can expand the water cooling of the steel truss body, thereby reducing the risk of the steel truss body being baked by fire, resulting in reduced strength, reduced elastic modulus, poor toughness, overall deformation and support connection damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a first perspective diagram of the overall structure of an embodiment of the present application.

[0021] Figure 2 This is a second perspective diagram of the overall structure of the embodiment of the present application; Figure 3 This is a three-dimensional diagram of a fire protection assembly according to an embodiment of the present application; Figure 4 This is a first perspective exploded view of the first sprinkler in an embodiment of the present application; Figure 5 This is a second perspective of the exploded view of the first sprinkler in an embodiment of the present application; Figure 6 This is a three-dimensional diagram of the monitoring component of an embodiment of the present application.

[0022] Description of reference numerals: 1. Steel truss body; 2. Firefighting assembly; 21. First sprinkler; 22. High-pressure water pipe; 23. Delivery water pipe; 24. Water pump; 25. Connecting water pipe; 26. Fixed frame; 27. Start button; 28. Airbag; 29. ​​Connecting block; 210. Limiting groove; 211. Moving plate; 212. Limiting plate; 213. Second sprinkler; 214. Push plate; 215. Support frame; 216. Turntable; 217. Transmission gear ring; 218. Servo motor; 219. Gear plate; 220. Fixed cross plate; 221. Sinking trough; 222. Bump; 3. Monitoring assembly; 31. Connecting frame; 32. Fixed gear; 33. Half gear; 34. Drive motor; 35. Connecting rod; 36. Monitoring camera. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0024] Example 1: A large-span steel truss with fire-fighting function includes a steel truss body 1, on which a fire-fighting component 2 is provided. The fire-fighting component 2 can automatically extinguish an accidental fire inside a building constructed by the steel truss body 1.

[0025] It should be noted that the steel truss body 1 is composed of a number of steel rods connected in a certain manner.

[0026] By setting up the fire-fighting assembly 2, a fire occurring inside a building constructed by the steel truss main body 1 can be extinguished automatically, thereby avoiding the problem of a fire occurring inside a building constructed by the steel truss main body 1 not being discovered in time and causing the fire to spread; in addition, when the fire is extinguished, water can be sprayed on the steel truss main body 1 to cool it down, thereby improving the fire resistance of the steel truss main body 1 and reducing the cost of repair and maintenance required due to damage to the steel truss main body 1 caused by fire.

[0027] The fire-fighting assembly 2 includes a first sprinkler 21 arranged on the lower end surface of the steel truss body 1 and a high-pressure water pipe 22 arranged on the inner side of the steel truss body 1. A fixing frame 26 is provided on the high-pressure water pipe 22, and the fixing frame 26 is connected to the steel truss body 1. A connecting water pipe 25 is provided on the high-pressure water pipe 22, and one end of the connecting water pipe 25 away from the high-pressure water pipe 22 is connected to the first sprinkler 21. One end of the high-pressure water pipe 22 is connected to a delivery water pipe 23, and one end of the delivery water pipe 23 is provided with a water pump 24. The upper end surface of the high-pressure water pipe 22 is provided with a connecting block 29, and the connecting block 29 is sleeved on the steel truss body 1. The high-pressure water pipe 22 is provided with a start button 27, and the start button 27 is located on one side of the first sprinkler 21. An air bag 28 is provided below the start button 27. The positions of the start button 27 and the air bag 28 correspond to each other. The air bag 28 is arranged at the bottom end of the inner side of the steel truss body 1, and a limiting groove 210 is provided on the upper end surface of the first sprinkler 21.

[0028] It should be noted that the middle portion of the connecting block 29 is hollowed out, and the connecting block 29 with a hollowed-out middle portion is sleeved on the steel rods on the steel truss body 1 , and the sleeved steel rods are placed horizontally front and back.

[0029] The airbag 28 that expands when heated can be used to start the water pump 24 to put out the fire in time when the temperature inside the building constructed by the steel truss body 1 rises sharply.

[0030] A movable plate 211 is provided on the upper end surface of the first water sprinkler 21, and a limiting plate 212 is provided on the lower end surface of the movable plate 211. The limiting plate 212 is slidably connected to the limiting groove 210 on the first water sprinkler 21, and a group of push plates 214 are provided on both sides of the upper end surface of the movable plate 211. Each group of push plates 214 has two push plates 214, and the positions of the two push plates 214 correspond to each other. A second water sprinkler 213 is rotatably provided on one end of the push plate 214 away from the movable plate 211, and the second water sprinkler 213 is rotatably connected to the first water sprinkler 21. The upper end surface of the first sprinkler 21 is provided with a support frame 215, which is located above the movable plate 211. The upper end surface of the support frame 215 is provided with a servo motor 218. A turntable 216 is rotatably provided at the top inner end of the support frame 215. The output end of the servo motor 218 is connected to the turntable 216. The servo motor 218 and the water pump 24 are both electrically connected to the start button 27. A transmission gear ring 217 is provided on the turntable 216. The transmission gear ring 217 is an open ring and a quarter gear ring. Tooth plates 219 are provided on both sides of the turntable 216. The two ends of the tooth plates 219 are connected to the two inner wall surfaces of the steel truss body 1.

[0031] It should be noted that the movable plate 211 blocks the limiting groove 210 on the upper end surface of the first sprinkler 21, so as to prevent external dust, water stains, etc. from falling into the limiting groove 210, thereby causing the accumulation of foreign objects such as dust or water stains inside the limiting groove 210.

[0032] By arranging the support frame 215, the servo motor 218, the turntable 216, the transmission gear ring 217, and the gear plate 219, the first sprinkler 21 can move back and forth horizontally on the lower end surface of the first sprinkler 21, thereby increasing the fire extinguishing range of the first sprinkler 21 and improving the fire extinguishing effect.

[0033] The lower end surface of the turntable 216 is provided with a protrusion 222, the upper end surface of the movable plate 211 is provided with a fixed horizontal plate 220, and the upper end surface of the fixed horizontal plate 220 is provided with a sinking groove 221, and one end of the protrusion 222 on the turntable 216 is inserted into the sinking groove 221 on the upper end surface of the fixed horizontal plate 220.

[0034] It should be noted that the diameter of the protrusion 222 is adapted to the size of the notch of the sinking groove 221 .

[0035] By setting the servo motor 218, turntable 216, protrusion 222, fixed horizontal plate 220, sinking groove 221, limit groove 210, movable plate 211, and limit plate 212, the second water sprinkler 213 can perform circular arc reciprocating flipping motion. The second water sprinkler 213 performing circular arc reciprocating flipping motion can expand the water cooling of the steel truss body 1, thereby reducing the risk of the steel truss body 1 being baked by fire, resulting in reduced strength, reduced elastic modulus, poor toughness, overall deformation, and support connection damage.

[0036] It should be noted that the second water sprinkler 213 is connected to the first water sprinkler 21 through a water sprinkler pipe, so that the water inside the first water sprinkler 21 can be transported to the second water sprinkler 213 for spraying.

[0037] The implementation principle of the embodiment of this application is: When in use, the water pump 24 is connected to the water source through the water pump pipe or the water pump 24 is placed at the water source. When an unexpected fire occurs inside the building constructed by the steel truss body 1, the fire will cause the temperature inside the building to rise rapidly. As the temperature rises, the air bag 28 will expand. When the expanded air bag 28 presses against the start button 27 on the high-pressure water pipe 22, the start button 27 starts the water pump 24 and the servo motor 218. The water pump 24 transports water from the water source to the high-pressure water pipe 22 through the delivery water pipe 23. The high-pressure water pipe 22 is transported to the first sprinkler 21 through the connecting water pipe 25. The first sprinkler 21 sprays water to the fire below the steel truss body 1, thereby extinguishing the fire. When the first sprinkler 21 sprays water at the fire, the water inside the first sprinkler 21 will be transported to the second sprinkler 213 through the sprinkler pipe. The second sprinkler 21 3 The steel truss body 1 is cooled by spraying water. The start of the servo motor 218 drives the turntable 216 and the transmission gear ring 217 and the protrusion 222 on the turntable 216 to rotate. When the transmission gear ring 217 engages with one tooth plate 219, the first water sprinkler 21 moves in one direction along the tooth plate 219. When the transmission gear ring 217 is staggered from the meshed tooth plate 219 and meshes with the other tooth plate 219, the first water sprinkler 21 moves in the opposite direction along the tooth plate 219, thereby causing the first water sprinkler 21 to move back and forth in the horizontal direction. The rotation of the protrusion 222 on the turntable 216 pushes the movable plate 211 to move back and forth horizontally along the movable plate 211 through the sunken groove 221 on the upper end surface of the fixed cross plate 220. During the movement, the movable plate 211 pushes the second water sprinkler 213 to perform circular reciprocating flips through the push plate 214.

[0038] Example 2: A large-span steel truss with fire-fighting function, wherein a monitoring component 3 is provided on the steel truss main body 1, and the monitoring component 3 includes a connecting frame 31 arranged on the lower end face of the steel truss main body 1, and a fixed gear 32 and a half gear 33 are rotatably provided on the inner side of the connecting frame 31, and the fixed gear 32 is located above the half gear 33, and the fixed gear 32 is engaged with the half gear 33. A driving motor 34 is provided on the connecting frame 31, and the output end of the driving motor 34 is connected to the fixed gear 32. A connecting rod 35 is provided on the lower end face of the half gear 33, and a monitoring camera 36 is provided at one end of the connecting rod 35.

[0039] By setting up the monitoring component 3, not only can the fire situation inside the building constructed by the steel truss body 1 be monitored, but the monitoring angle can also be adjusted, so that the monitoring component 3 has a larger monitoring range.

[0040] The implementation principle of the embodiment of this application is: When it is necessary to adjust the fire observation angle inside the building constructed by the steel truss body 1, the drive motor 34 is started, and the drive motor 34 drives the fixed gear 32 connected to it, and the fixed gear 32 drives the half gear 33 to rotate, and the half gear 33 drives the monitoring camera 36 connected thereto to rotate. The rotation of the monitoring camera 36 allows the observation angle to be adjusted. When the monitoring camera 36 is adjusted to a suitable angle, the drive motor 34 can be turned off.

[0041] The limiting groove 210 has an isosceles trapezoidal cross section, and the limiting plate 212 matches the shape and size of the limiting groove 210. The isosceles trapezoidal cross section of the limiting groove 210 and the limiting plate 212 provide guidance and position limiting functions for the movable plate 211 on the first sprinkler 21, while also providing a connection between the limiting plate 212 and the first sprinkler 21.

[0042] Working principle of the present invention: When in use, the water pump 24 is connected to the water source through the water pump pipe or the water pump 24 is placed at the water source. When an unexpected fire occurs inside the building constructed by the steel truss body 1, the fire will cause the temperature inside the building to rise rapidly. As the temperature rises, the air bag 28 will expand. When the expanded air bag 28 presses against the start button 27 on the high-pressure water pipe 22, the start button 27 starts the water pump 24 and the servo motor 218. The water pump 24 transports water from the water source to the high-pressure water pipe 22 through the delivery water pipe 23. The high-pressure water pipe 22 transports water to the first sprinkler 21 through the connecting water pipe 25. The first sprinkler 21 sprays water to the fire below the steel truss body 1, from When the first sprinkler 21 sprays water at the fire site, the water inside the first sprinkler 21 is transported to the second sprinkler 213 through the sprinkler pipe. The second sprinkler 213 sprays water to cool the steel truss body 1. This can improve the fire resistance of the steel truss body 1 and reduce the cost of repair and maintenance caused by the damage to the steel truss body 1 caused by the fire. The start of the servo motor 218 drives the turntable 216 and the transmission gear ring 217 and the protrusion 222 on the turntable 216 to rotate. When the transmission gear ring 217 and the protrusion 222 on the turntable 216 rotate, the transmission gear ring 217 and the protrusion 222 on the turntable 216 rotate. When the movable gear ring 217 is engaged with a tooth plate 219, the first water sprayer 21 will move in one direction along the tooth plate 219. When the transmission gear ring 217 is staggered from the meshed tooth plate 219 and meshed with the other tooth plate 219, the first water sprayer 21 will move in the opposite direction along the tooth plate 219, thereby making the first water sprayer 21 move back and forth in the horizontal direction; the rotation of the protrusion 222 on the turntable 216 will push the movable plate 211 to move back and forth horizontally along the movable plate 211 through the sunken groove 221 on the upper end surface of the fixed cross plate 220. During the movement, the movable plate 211 will push the second water sprayer 213 to make a circular arc reciprocating turn through the push plate 214. Turn; when it is necessary to observe the fire inside the building constructed by the steel truss body 1, the monitoring camera 36 is started, and the monitoring camera 36 observes the fire inside the building constructed by the steel truss body 1. When it is necessary to adjust the angle of observation of the fire inside the building constructed by the steel truss body 1, the drive motor 34 is started, and the drive motor 34 drives the fixed gear 32 connected thereto, and the fixed gear 32 drives the half gear 33 to rotate, and the half gear 33 drives the monitoring camera 36 connected thereto to rotate. The rotation of the monitoring camera 36 allows the observation angle to be adjusted. When the monitoring camera 36 is adjusted to a suitable angle, the drive motor 34 can be turned off.

[0043] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A large-span steel truss with fire-fighting function, comprising a steel truss body (1), characterized in that: The steel truss main body (1) is provided with a fire-fighting assembly (2), and the fire-fighting assembly (2) can automatically extinguish a fire that accidentally occurs inside a building constructed by the steel truss main body (1).

2. The large-span steel truss with fire-fighting function according to claim 1, characterized in that: The fire-fighting assembly (2) comprises a first sprinkler (21) arranged on the lower end surface of the steel truss body (1) and a high-pressure water pipe (22) arranged on the inner side of the steel truss body (1), a fixing frame (26) is provided on the high-pressure water pipe (22), and the fixing frame (26) is connected to the steel truss body (1), and a connecting water pipe (25) is provided on the high-pressure water pipe (22), and one end of the connecting water pipe (25) away from the high-pressure water pipe (22) is connected to the first sprinkler (21), and one end of the high-pressure water pipe (22) is connected to a delivery water pipe (23), and one end of the delivery water pipe (23) is provided with a water pump (24).

3. The large-span steel truss with fire-fighting function according to claim 2, characterized in that: The upper end surface of the high-pressure water pipe (22) is provided with a connecting block (29), and the connecting block (29) is sleeved on the steel truss body (1). The high-pressure water pipe (22) is provided with a start key (27), and the start key (27) is located on one side of the first water sprayer (21). An air bag (28) is provided below the start key (27), and the positions of the start key (27) and the air bag (28) correspond to each other. The air bag (28) is provided at the bottom end of the inner side of the steel truss body (1). A limiting groove (210) is provided on the upper end surface of the first water sprayer (21).

4. The large-span steel truss with fire-fighting function according to claim 3, characterized in that: The upper end surface of the first water sprayer (21) is provided with a movable plate (211), and the lower end surface of the movable plate (211) is provided with a limiting plate (212), and the limiting plate (212) is slidably connected to the limiting groove (210) on the first water sprayer (21). A group of push plates (214) are provided on both sides of the upper end surface of the movable plate (211), and each group of the push plates (214) is two, and the positions of the two push plates (214) correspond to each other. A second water sprayer (213) is rotatably provided at one end of the push plate (214) away from the movable plate (211), and the second water sprayer (213) is rotatably connected to the first water sprayer (21).

5. The large-span steel truss with fire-fighting function according to claim 4, characterized in that: The upper end surface of the first water sprayer (21) is provided with a support frame (215), the support frame (215) is located above the movable plate (211), the upper end surface of the support frame (215) is provided with a servo motor (218), the top end of the inner side of the support frame (215) is rotatably provided with a turntable (216), the output end of the servo motor (218) is connected to the turntable (216), and the servo motor (218) and the water pump (24) are electrically connected to the start key (27).

6. The large-span steel truss with fire-fighting function according to claim 5, characterized in that: A transmission gear ring (217) is provided on the turntable (216), the transmission gear ring (217) is an open ring, and the transmission gear ring (217) is a quarter gear ring. Tooth plates (219) are provided on both sides of the turntable (216), and the two ends of the tooth plates (219) are connected to the two inner wall surfaces of the steel truss body (1).

7. The large-span steel truss with fire-fighting function according to claim 5, characterized in that: The lower end surface of the turntable (216) is provided with a protrusion (222), the upper end surface of the movable plate (211) is provided with a fixed transverse plate (220), the upper end surface of the fixed transverse plate (220) is provided with a sinking groove (221), and one end of the protrusion (222) on the turntable (216) is inserted into the sinking groove (221) on the upper end surface of the fixed transverse plate (220).

8. The large-span steel truss with fire-fighting function according to claim 1, characterized in that: A monitoring assembly (3) is provided on the steel truss body (1), and the monitoring assembly (3) includes a connecting frame (31) provided on the lower end surface of the steel truss body (1). A fixed gear (32) and a half gear (33) are rotatably provided inside the connecting frame (31). The fixed gear (32) is located above the half gear (33), and the fixed gear (32) and the half gear (33) are meshed.

9. The large-span steel truss with fire-fighting function according to claim 8, characterized in that: A driving motor (34) is provided on the connecting frame (31), and an output end of the driving motor (34) is connected to the fixed gear (32). A connecting rod (35) is provided on the lower end surface of the half gear (33), and a monitoring camera (36) is provided at one end of the connecting rod (35).

10. The large-span steel truss with fire-fighting function according to claim 4, characterized in that: The cross section of the limiting groove (210) is in the shape of an isosceles trapezoid, and the limiting plate (212) is adapted to the shape and size of the limiting groove (210).

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