Supporting device and method for long-span steel structure

Abstract

The application discloses a supporting device for large-span steel structure, which comprises a bottom platform, a fixing seat is installed on the bottom platform through an extension rod, a supporting seat is installed on the fixing seat, two limiting grooves are formed on the surface of the supporting seat, adjusting grooves and sliding grooves are sequentially formed from inside to outside on the surface of the fixing seat, first bearing plates are fixedly connected with the centers of the limiting grooves and the centers of the sliding grooves, second bearing plates are slidably connected between the sliding grooves and the limiting grooves, a reverse V-shaped structure for supporting the large-span steel structure is formed between the first bearing plates and the second bearing plates, bidirectional screw rods are installed in the inner cavities of the two adjusting grooves, the splicing structure can realize the installation of roofs with different slopes and different spans by using only one mounting device, the supporting structure with multiple angles does not need to be reset for installing and supporting the steel frame roof beam during installation, and the installation efficiency of the roof beam steel structure frame and the overall utilization rate of the device are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a support device and method for large-span steel structures. Background Technology

[0002] Large-span steel structure building roofs are widely used in construction projects. In various places, large-span steel structure building roofs are spliced ​​together. Generally, large-span steel structure building roofs include curved horizontal beams, longitudinal beams and connecting supports. A single longitudinal beam connects all the curved horizontal beams, thus forming a building roof with a slope.

[0003] In the installation of existing large-span steel structures, the common methods are split-type installation or overall hoisting. Overall hoisting is suitable for large open areas and situations where mechanical operations are applicable, while split-type installation is suitable for various situations, especially those where overall hoisting is not feasible. However, split-type installation also has certain drawbacks. For example, it requires dividing the steel structure into multiple independent parts, hoisting them, and then installing them at their respective work positions. Due to the swaying of the ropes during hoisting, in order to ensure that the steel structure units can be stably and accurately connected at the installation positions, manual operation is generally required at high altitudes, i.e., manually pulling the steel structure units, or multiple temporary support points need to be established to ensure the stability of the steel structure units after hoisting.

[0004] However, the above two methods have the following problems.

[0005] 1) Manual operations at heights require a large number of personnel, making it difficult to ensure the balance of force applied by each person, and high-altitude operations are prone to increasing the risk of construction accidents.

[0006] 2) There are a large number of temporary support points, making construction complicated. After the temporary support points are built, components need to be installed by hoisting. At this time, the structure has not yet formed a support system, and other support structures need to be set up to protect it and prevent collapse. Summary of the Invention

[0007] The purpose of this invention is to provide a support device and method for large-span steel structures to solve the support problem in the process of split installation of large-span steel structures.

[0008] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0009] A support device for a large-span steel structure includes a bottom platform, a fixed seat installed on the bottom platform via a telescopic rod, a support seat installed at the center of the fixed seat, and two mutually parallel limiting grooves formed on the surface of the support seat along its own length direction.

[0010] The surfaces of the fixed seats on both sides of the support base are provided with adjustment grooves and sliding grooves from the inside to the outside. A first bearing plate is fixedly connected to the center of the sliding groove and the center of the limiting groove. A second bearing plate is slidably connected between the sliding groove and the limiting groove on both sides of the first bearing plate. The second bearing plate is arranged parallel to the first bearing plate. The two first bearing plates and the two second bearing plates at corresponding positions on both sides of the support base form an inverted V-shaped structure to support the large-span steel structure.

[0011] Both of the adjustment slots are equipped with bidirectional threaded screws in their inner cavities. The bidirectional threaded screws are threaded through the fixed end of the first bearing plate. The two opposite threaded sections of the bidirectional threaded screws are fitted with sliding blocks with built-in threads. The sliding blocks are connected to the second bearing plate.

[0012] The two bidirectional threaded screws can be driven by a single motor to rotate forward or backward, thereby causing two sliding blocks located on different thread sections to move closer to or further away from the first bearing plate, so as to adjust the distance between the first bearing plate and the second bearing plate.

[0013] As a preferred embodiment of the present invention, both the first bearing plate and the second bearing plate are provided with U-shaped grooves along their own length for placing the large-span steel structure.

[0014] As a preferred embodiment of the present invention, both the limiting groove and the sliding groove are provided with sliding rods in their inner cavities. A first fixing block is fixedly connected at the center of the inner cavity of both the sliding groove and the limiting groove, and the sliding rod passes through the inner cavity of the first fixing block. Sliding blocks are slidably connected to the sliding rods on both sides of the first fixing block. The first fixing block is connected to the first bearing plate, and the sliding block is connected to the second bearing plate.

[0015] A second fixing block is fixedly connected to the center of the inner cavity of the adjusting groove. The bidirectional threaded screw thread passes through the inner cavity of the second fixing block and is located between the second fixing block and the first bearing plate. The second fixing block is located between the two sliding blocks.

[0016] As a preferred embodiment of the present invention, the support base located between the two adjustment slots is provided with an installation slot perpendicular to the adjustment slots. The two ends of the installation slot are respectively connected to the two adjustment slots. A placement slot is provided at the center of the installation slot. A drive motor is installed in the inner cavity of the placement slot. The drive end of the drive motor is connected to a rotating shaft. The rotating shaft is rotatably connected to the side wall of the installation slot. A drive gear is installed on the rotating shaft.

[0017] Two bidirectional threaded screws located at the openings at both ends of the mounting groove are each connected to a transmission gear. A toothed chain that can drive all three to rotate synchronously is wound around the two transmission gears and the driving gear. The toothed chain is located in the mounting groove.

[0018] In a preferred embodiment of the present invention, a telescopic member is connected between the support base and the mounting base, and the telescopic member can drive the support base to rise or fall.

[0019] The sliding block and the second bearing plate, as well as the second fixed block and the first bearing plate, are all connected by telescopic components;

[0020] The first fixing block is hinged to the first bearing plate, and the slider is hinged to the second bearing plate.

[0021] The first and second bearing plates can rotate around the fixed seat at a certain angle during the lifting and lowering of the support base, so as to adapt to the installation of large-span steel structures with different installation inclinations.

[0022] As a preferred embodiment of the present invention, the first bearing plate and the second bearing plate are provided with sliding grooves along their own length at the ends near the support base. The inner cavity of each sliding groove is slidably connected to an I-shaped slider, and each I-shaped slider is hinged to the first fixing block in the limiting groove corresponding to the slider.

[0023] In a preferred embodiment of the present invention, the telescopic member includes a main rod and a secondary rod. A main rod is installed between the first bearing plate and the second fixed block, and between the second bearing plate and the sliding block. The secondary rod is slidably inserted into the main rod, and each of the secondary rods is respectively hinged to the bottom of the first bearing plate and the second bearing plate.

[0024] In addition, the present invention also provides a method for using a large-span steel structure splicing and installation device, including the following methods;

[0025] S1: Place the curved beams of the steel roof onto the inverted V-shaped structure using a forklift or small crane. During placement, adjust the spacing between the unit steel structures of the roof beam steel frame and the inclination angle of the inverted V-shaped structure accordingly, based on the different spacing between the unit steel structures of the roof beam steel frame and the different inclination surfaces of the roof beam steel frame.

[0026] S2: After the curved beam is placed, the fixed seat is raised by the telescopic rod to increase the height of the roof beam steel structure frame, so that the steel structure roof can be moved to a suitable position. Then, it is installed manually. After installation, the telescopic rod is lowered to separate the steel frame from the inverted V-shaped structure. During the installation process, the first bearing plate and the second bearing plate play a supporting role for the curved beam.

[0027] S3. Install the crossbeams on each side in sequence according to the steps in S2. Adjust the first and second bearing plates according to the different inclination angles of each side and the spacing between the unit steel structures. Move them to each installation surface in sequence under the drive of the bottom rollers of the bottom platform to complete the overall installation. There is no need to reset the support points during the installation process.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] This splicing structure utilizes only one installation device to achieve roof installation on different slopes and spans. During installation, there is no need to reset multiple angle support structures to support the steel frame roof beams, which greatly improves the installation efficiency of the roof beam steel frame and the overall utilization rate of the device. Furthermore, the accurate connection between the roof beam steel frame and the roof truss is achieved during the lifting and lowering of the installation base. The inverted V-shaped structure provides support for the steel frame roof beams, reducing the possibility of collapse. Due to the support of the inverted V-shaped structure, installers do not need to manually move the steel frame roof beams; they only need to complete the assembly at the splice points during installation, simplifying the operation steps for workers and ensuring high installation safety. Attached Figure Description

[0030] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of the device provided by the present invention;

[0032] Figure 2 Provided by the present invention Figure 1 Schematic diagram of the middle support base;

[0033] Figure 3 Provided by the present invention Figure 2 A schematic diagram of the cross-sectional structure of the support base in the middle;

[0034] Figure 4 This is a schematic diagram of the structure of the second bearing plate provided by the present invention;

[0035] The labels in the diagram represent the following:

[0036] 1. Bottom platform; 2. Telescopic rod; 3. Fixed base; 4. Support base; 5. Limiting groove; 6. Adjusting groove; 7. Sliding groove; 8. First bearing plate; 9. Second bearing plate; 10. Bidirectional threaded screw; 11. Sliding block; 12. U-shaped groove; 13. Sliding rod; 14. First fixed block; 15. Sliding block; 16. Second fixed block; 17. Mounting groove; 18. Placement groove; 19. Drive motor; 20. Rotating shaft; 21. Drive gear; 22. Transmission gear; 23. Gear chain; 24. Telescopic column; 25. Telescopic component; 26. Sliding groove; 27. I-shaped sliding block;

[0037] 251. Main stick; 252. Secondary stick. Detailed Implementation

[0038] 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.

[0039] like Figure 1 , Figure 2 and Figure 4 As shown, a support device for a large-span steel structure includes a bottom platform 1. Rollers are provided at the bottom of the bottom platform 1 to facilitate its movement, thereby facilitating the connection and installation of the roof beam steel structure frame and the roof truss. A fixed seat 3 is installed on the bottom platform 1 via a telescopic rod 2. A support seat 4 is installed at the center of the fixed seat 3. Two parallel limiting grooves 5 are provided on the surface of the support seat 4 along its length.

[0040] The surfaces of the fixed seats 3 on both sides of the support base 4 are provided with adjustment grooves 6 and sliding grooves 7 from the inside to the outside. The center of the sliding groove 7 and the center of the limiting groove 5 are fixedly connected to the first bearing plate 8. The sliding grooves 7 and the limiting grooves 5 on both sides of the first bearing plate 8 are slidably connected to the second bearing plate 9. The second bearing plate 9 is arranged parallel to the first bearing plate 8. The first bearing plate 8 and the second bearing plate 9 are provided with U-shaped grooves 12 along their own length direction for placing large-span steel structures. The U-shaped grooves 12 facilitate the placement of large-span steel structures. The two first bearing plates 8 and the two second bearing plates 9 on the corresponding positions on both sides of the support base 4 form an inverted V-shaped structure to support the large-span steel structure.

[0041] The inner cavities of the two adjustment slots 6 are each equipped with a bidirectional threaded screw 10. The bidirectional threaded screw 10 passes through the fixed end of the first bearing plate 8. The two opposite threaded sections of the bidirectional threaded screw 10 are each fitted with a sliding block 11 with an internal thread. The sliding block 11 is connected to the second bearing plate 9.

[0042] Two bidirectional threaded screws 10 can be driven by a single motor to rotate forward or backward, thereby causing two sliding blocks 11 located on different thread sections to move closer to or further away from the first bearing plate 8, so as to adjust the distance between the first bearing plate 8 and the second bearing plate 9.

[0043] This device forms multiple inverted V-shaped structures between two opposing first bearing plates 8 and two second bearing plates 9. The first bearing plates 8 and the two second bearing plates 9 have identical structures and shapes. These multiple inverted V-shaped structures can limit and fix the roof beams of large-span steel structures. Furthermore, the inverted V-shaped structures are equipped with multiple support points, resulting in strong stability and the ability to support the weight of large-span steel structure roof beams. The spacing between the first bearing plates 8 and the second bearing plates 9 can also be adjusted. Using only one installation device, installation on roofs with different slopes and spans can be achieved. This method eliminates the need to redesign support structures at multiple angles for the installation of steel roof beams, significantly improving the installation efficiency of the steel roof beam frame and the overall utilization rate of the device. Furthermore, the accurate connection between the steel roof beam frame and the roof truss is achieved during the lifting and lowering of the support plate. The support plate effectively supports the steel roof beam, reducing the possibility of collapse. Due to the support plate's support function, installation workers do not need to manually move the steel roof beam; they only need to assemble the joints during installation, simplifying the work process and saving manpower and resources.

[0044] Specifically, such as Figure 1-3 As shown, both the inner cavities of the limiting groove 5 and the sliding groove 7 are provided with sliding rods 13. A first fixing block 14 is fixedly connected at the center of the inner cavity of the sliding groove 7 and the limiting groove 5, and the sliding rod 13 passes through the inner cavity of the first fixing block 14. A slider 15 is slidably connected to the sliding rod 13 on both sides of the first fixing block 14. The first fixing block 14 is connected to the first bearing plate 8, and the slider 15 is connected to the second bearing plate 9.

[0045] A second fixing block 16 is fixedly connected to the center of the inner cavity of the adjusting groove 6. A bidirectional threaded screw 10 is threaded through the inner cavity of the second fixing block 16 and is located between the second fixing block 16 and the first bearing plate 8. The second fixing block 16 is located between two sliding blocks 11.

[0046] Among them, the sliding rod 13 in the limiting groove 5 and the sliding groove 7 mainly plays a guiding role to ensure that the slider 15 and the sliding block 11 can slide in a straight line. When the bidirectional threaded screw 10 rotates, the slider 15 located on both sides of the first fixed block 14 moves towards the first fixed block 14, and the sliding block 11 on both sides of the second fixed block 16 moves towards the second fixed block 16. At this time, the distance between the first bearing plate 8 and the second bearing plate 9 decreases, and conversely, the distance between the first bearing plate 8 and the second bearing plate 9 increases.

[0047] The device uses three pairs of steel beams for large-span steel roof beams to place load-bearing plates. One pair is fixed, while the other two pairs are movable, thus achieving the effect of spacing adjustment. The three pairs of steel beams for large-span steel roof beams provide three main stress points, which can basically meet the installation requirements of any large-span steel roof beam.

[0048] Since the first bearing plates 8 located on both sides of the support base 4 need to maintain synchronous movement, a single motor drive can be used.

[0049] Specifically, such as Figure 1-2 As shown, the support base 4 located between the two adjustment slots 6 has an installation slot 17 perpendicular to the adjustment slots 6. The two ends of the installation slot 17 are respectively connected to the two adjustment slots 6. A placement slot 18 is provided at the center of the installation slot 17. A drive motor 19 is installed in the inner cavity of the placement slot 18. The drive end of the drive motor 19 is connected to a rotating shaft 20. The rotating shaft 20 is rotatably connected to the side wall of the installation slot 17. An active gear 21 is installed on the rotating shaft 20.

[0050] Two bidirectional threaded screws 10 located at the openings at both ends of the mounting groove 17 are each connected to a transmission gear 22. A toothed chain 23 that can drive the three to rotate synchronously is wound between the two transmission gears 22 and the driving gear 21. The toothed chain 23 is located in the mounting groove 17.

[0051] In this device, a single motor synchronous drive is used to achieve synchronous adjustment of the first bearing plate 8 and the second bearing plate 9 on both sides. The two bidirectional threaded screws 10 are driven by a transmission assembly consisting of a transmission gear 22, a drive gear 21 and a toothed chain 23. During transmission, the drive motor 19 drives the rotating shaft 20 to rotate, and the rotating shaft 20 drives the drive gear 21 to rotate. Since the drive gear 21 is connected to the transmission gear 22 on the two bidirectional threaded screws 10 through the toothed chain 23, the drive gear 21 drives the toothed chain 23 to move, thereby driving the two transmission gears 22 to rotate. The two rotating transmission gears 22 respectively drive the two bidirectional threaded screws 10 to rotate, and the movement trends of the two bidirectional threaded screws 10 are the same.

[0052] Because the crossbeam has a certain curved angle, in order to ensure that the crossbeam can be stably mounted on the support plate during installation, it is necessary to adjust the angle of the crossbeam. Therefore, an embodiment of an angle adjustment mechanism is provided.

[0053] Specifically, such as Figure 1-3 As shown, a telescopic column 24 is connected between the support base 4 and the fixed base 3, and the telescopic column 24 can drive the support base 4 to rise or fall.

[0054] The sliding block 11, the second bearing plate 9, the second fixed block 16 and the first bearing plate 8 are all connected by telescopic components 25;

[0055] The first fixed block 14 is hinged to the first bearing plate 8, and the slider is hinged to the second bearing plate 9.

[0056] The first bearing plate 8 and the second bearing plate 9 can rotate around the fixed seat 3 at a certain angle during the lifting and lowering of the support seat 4, so as to adapt to the installation of large-span steel structures with different installation inclinations.

[0057] Furthermore, the telescopic component 25 includes a main rod 251 and a secondary rod 252. A main rod 251 is installed between the first bearing plate 8 and the second fixed block 16, and between the second bearing plate 9 and the sliding block 11. The secondary rod 252 is slidably inserted into the main rod 251. Each secondary rod 252 is respectively hinged to the bottom of the first bearing plate 8 and the second bearing plate 9.

[0058] The telescopic column can be an electric telescopic rod or a hydraulic telescopic rod. It mainly controls the rise or fall of the support seat 4. When the support seat 4 rises, the rising support seat 4 can drive the first bearing plate 8 and the second bearing plate 9 to slide along the surface of the support seat 4. At this time, the distance between the first bearing plate 8 and the second bearing plate 9 and the fixed seat 3 increases, and the auxiliary rod 252 in the telescopic member 25 can be pulled out along the main rod 251 to adapt to the angle adjustment of the first bearing plate 8 and the second bearing plate 9. Conversely, when the support seat 4 falls, the distance between the first bearing plate 8 and the second bearing plate 9 and the fixed seat 3 decreases, and the auxiliary rod 252 in the telescopic member 25 can extend into the inner cavity of the main rod 251.

[0059] The telescopic component 25 can both extend and retract to accommodate the angle changes of the first bearing plate 8 and the second bearing plate 9, and also provide support for the first bearing plate 8 and the second bearing plate 9, thereby improving the overall support capacity of the device for large-span steel structures.

[0060] Since there is a change in displacement between the support base 4 and the first bearing plate 8 and the second bearing plate 9 when the support base 4 is raised, in order to reduce the constraint on the movement between the support base 4 and the first bearing plate 8 and the second bearing plate 9, it is necessary to ensure the change in displacement between the support base 4 and the first bearing plate 8 and the second bearing plate 9.

[0061] Specifically, such as Figure 3 As shown, the first bearing plate 8 and the second bearing plate 9 are both provided with sliding grooves 26 along their own length at the end near the support base 4. The inner cavity of each sliding groove 26 is slidably connected to an I-shaped slider 27. Each I-shaped slider 27 is hinged to the first fixing block 14 and slider 15 in the limiting groove 5. The I-shaped slider 27 and the first fixing block 14 or slider 15 form a connecting member, and one end of the connecting member can slide along the sliding groove 26, which can adjust the displacement between the first bearing plate 8, the second bearing plate 9 and the support base 4.

[0062] This invention provides a method for splicing a support device for a large-span steel structure, comprising the following methods:

[0063] S1: Place the curved beams of the steel roof onto the inverted V-shaped structure using a forklift or small crane. During placement, adjust the spacing between the unit steel structures of the roof beam steel frame and the inclination angle of the roof beam steel frame accordingly, based on the different spacing between the unit steel structures of the roof beam steel frame and the different inclination angles of the roof beam steel frame.

[0064] S2: After the curved beam is placed, the fixed seat 3 is raised by the telescopic rod 2 to increase the height of the roof beam steel structure frame, thereby moving the steel structure roof to a suitable position. Then, it is installed manually. After installation, the telescopic rod 2 is lowered to separate the steel frame from the inverted V-shaped structure. During the installation process, the first bearing plate 8 and the second bearing plate 9 play a supporting role for the curved beam.

[0065] S3. Install the crossbeams of each face in sequence according to the steps in S2. Adjust the first bearing plate 8 and the second bearing plate 9 according to the different inclination angles of each face and the spacing between the unit steel structure. Move them to each installation face in sequence under the drive of the bottom rollers of the bottom platform 1 to complete the overall installation. There is no need to reset the support points during the installation process.

[0066] By lifting the roof beam steel structure frame and adjusting the angle between the support plates on both sides, the mechanical movement, adjustment, and pressing of the roof beam steel structure frame are realized. This simplifies the operation steps for workers, greatly improves the installation efficiency of the roof beam steel structure frame and the overall utilization rate of the device, while saving manpower and material resources.

[0067] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A bracing device for a long span steel structure, characterized by, Including bottom platform (1), fixed seat (3) is installed on the bottom platform (1) by telescopic rod (2), support seat (4) is installed at the center of fixed seat (3), the surface of support seat (4) is provided with two parallel limit slots (5) along the length direction of itself; The surface of fixed seat (3) on both sides of support seat (4) is sequentially provided with adjusting groove (6) and sliding groove (7) from inside to outside, first bearing plate (8) is fixedly connected at the center of sliding groove (7) and the center of limit slot (5), second bearing plate (9) is slidably connected between sliding groove (7) and limit slot (5) on both sides of first bearing plate (8), and second bearing plate (9) is arranged in parallel with first bearing plate (8); Two first bearing plates (8) and two second bearing plates (9) are arranged at corresponding positions on both sides of support seat (4), and a reverse V-shaped structure supporting large-span steel structure is formed between the two first bearing plates (8) and the two second bearing plates (9); The inner cavities of two adjusting grooves (6) are provided with bidirectional screw rods (10), the bidirectional screw rods (10) are threaded through the fixed ends of first bearing plate (8), and the two opposite threaded sections of bidirectional screw rod (10) are provided with sliding blocks (11) with built-in threads, and the sliding blocks (11) are connected with second bearing plate (9); Two bidirectional screw rods (10) can be driven by a single motor to rotate forward or reverse, so as to drive the sliding blocks (11) located on different threaded sections to move close to or away from first bearing plate (8), so as to adjust the distance between first bearing plate (8) and second bearing plate (9).

2. The bracing device of claim 1, wherein the bracing device is configured to be attached to the steel structure at the first and second attachment points. The first bearing plate (8) and the second bearing plate (9) are provided with U-shaped grooves (12) along the length direction of themselves for placing the large-span steel structure.

3. The bracing device of claim 1, wherein the bracing device is configured to be attached to a first and second support member of a large span steel structure. The inner cavities of limit slot (5) and sliding groove (7) are provided with sliding rods (13), first fixed blocks (14) are fixedly connected at the inner cavity centers of sliding groove (7) and limit slot (5), the sliding rods (13) penetrate the inner cavities of first fixed blocks (14), sliding blocks (15) are slidably connected on the sliding rods (13) on both sides of first fixed blocks (14), the first fixed blocks (14) are connected with first bearing plate (8), and the sliding blocks (15) are connected with second bearing plate (9); The inner cavity center of adjusting groove (6) is fixedly connected with second fixed block (16), the bidirectional screw rod (10) is threaded through the inner cavity of second fixed block (16), the second fixed block (16) is connected with first bearing plate (8), and the second fixed block (16) is located between the two sliding blocks (11).

4. The bracing device of claim 3, wherein the bracing device is configured to be attached to the steel structure at the first and second attachment points. The supporting seat (4) between two adjusting grooves (6) is provided with a mounting groove (17) perpendicular to the adjusting groove (6), two ends of the mounting groove (17) are communicated with two adjusting grooves (6) respectively, a placing groove (18) is arranged at the center of the mounting groove (17), a driving motor (19) is arranged in the inner cavity of the placing groove (18), a driving end of the driving motor (19) is connected with a rotating shaft (20), the rotating shaft (20) is rotatably connected with the side wall of the mounting groove (17), and a driving gear (21) is arranged on the rotating shaft (20). Two bidirectional threaded rods (10) at the openings of two ends of the mounting groove (17) are connected with transmission gears (22), the transmission gears (22) and the driving gear (21) are wound with a gear chain (23) capable of driving the three to rotate synchronously, and the gear chain (23) is located in the mounting groove (17).

5. The bracing device of claim 4, wherein the bracing device is configured to be attached to the steel structure at the first and second attachment points. The supporting seat (4) and the fixed seat (3) are connected with a telescopic column (24), and the telescopic column (24) can drive the supporting seat (4) to rise or fall. The sliding block (11), the second bearing plate (9), the second fixed block (16) and the first bearing plate (8) are connected with telescopic members (25). The first fixed block (14), the first bearing plate (8), the sliding block and the second bearing plate (9) are hingedly connected. The first bearing plate (8) and the second bearing plate (9) can rotate by a certain angle around the fixed seat (3) in the process of lifting the supporting seat (4), so as to adapt to the installation of large-span steel structures with different installation inclination.

6. The bracing device of claim 3, wherein the bracing device is configured to be attached to the steel structure at the first and second attachment points. The first bearing plate (8) and the second bearing plate (9) are close to one end of the supporting seat (4) and are provided with sliding grooves (26) along the length direction of the first bearing plate (8) and the second bearing plate (9), respectively, the inner cavities of the sliding grooves (26) are slidably connected with I-shaped sliding blocks (27), and the I-shaped sliding blocks (27) are correspondingly hingedly connected with the first fixed block (14) and the sliding block (15) in the limiting groove (5).

7. The bracing device of claim 5, wherein the bracing device is configured to be attached to the steel structure at the first and second attachment points. The telescopic member (25) comprises a main rod (251) and a sub-rod (252), one main rod (251) is arranged between the first bearing plate (8) and the second fixed block (16), the second bearing plate (9) and the sliding block (11), the main rod (251) is slidably inserted into the sub-rod (252), and the sub-rod (252) is hingedly connected with the bottom of the first bearing plate (8) and the second bearing plate (9) respectively.

8. A method of using a bracing device for a long span steel structure as claimed in any one of claims 1 to 7, characterised in that, The method comprises the following steps: S1: placing the curved beam of the steel structure roof on the inverted V-shaped structure by a forklift or a small lifting machine, when placing, adjusting the distance between the first bearing plate (8) and the second bearing plate (9) and the inclination angle on the inverted V-shaped structure according to the distance between the unit steel structures of the roof beam steel structure frame in the installation roof and the inclined surface of the roof beam steel structure frame in the roof. S2: After the curved cross beam is placed, the fixed seat (3) is raised by the telescopic rod (2) to raise the height of the roof steel structure frame, so that the steel structure roof is moved to a suitable position, and then installed by manual installation. After installation, the telescopic rod (2) is lowered, so that the steel frame is separated from the inverted V-shaped structure. During installation, the first bearing plate (8) and the second bearing plate (9) have the effect of supporting the curved cross beam; S3, install the cross beams of each surface in turn according to the steps in S2, and adjust the first bearing plate (8) and the second bearing plate (9) according to the different distances between the inclination angles of each surface and the unit steel structure. Under the drive of the bottom platform (1) bottom roller, move to each installation surface in turn to complete the overall installation. During installation, the support point does not need to be reset.

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