A modular roof structure for a large-span assembled building and its installation method

Abstract

The present invention discloses a modular roof structure of a large-span prefabricated building and an installation method thereof, and belongs to the technical field of prefabricated buildings. The present invention includes a shell, a side frame, an adjustment assembly and a reinforcement assembly. A plurality of side frames are movably installed at equal intervals on the shell. The adjustment assembly includes a load-bearing shell and a lifting mechanism installed in the load-bearing shell. The load-bearing shell is provided at the bottom of the shell. The lifting mechanism is provided with a rotating seat corresponding to each side frame. One end of the side frame can be rotatably installed in the inner cavity of the rotating seat, and the other end is connected to the reinforcement assembly. A movable block is sleeved on the surface of the side frame. The outer side of the movable block is rotatably installed on one end of the stabilizing plate, and the other end of the stabilizing plate is fixedly connected to the shell. The roof structure of the present invention has the advantages of adjustable slope and good stability through the arrangement of the adjustment assembly and the reinforcement assembly, which significantly improves the flexibility of the building roof, has good market prospects, and is worthy of promotion and application.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and in particular to a modular roof structure of a large-span prefabricated building and an installation method thereof. Background Art

[0002] Prefabricated buildings refer to buildings that transfer a large amount of on-site work in traditional construction methods to factories, where building components and accessories (such as floor slabs, wall panels, stairs, balconies, etc.) are processed and manufactured in the factory, transported to the construction site, and assembled and installed on site through reliable connection methods.

[0003] The roof is the load-bearing and enclosing component at the top of a building, also known as the "fifth facade" of a building. It has a great influence on the shape and facade image of the building, and the form of the roof will directly affect the overall image of the building. For example, the patent document with the Chinese patent publication number CN216238980U discloses a large-span prefabricated building roof structure, which includes a mounting seat: two are symmetrically provided; a support assembly: including pin holes, through holes, pin columns, limiting holes and supports, the pin holes are evenly provided on the surface of the mounting seat, the through holes pass through the middle of the two ends of the mounting seat, the pin columns correspond to the pin holes, the limiting holes are provided at the bottom of the pin columns, the bottoms of the two ends of the support are respectively fixedly connected to the tops of the pin columns on both sides, the support assembly is provided with a side beam assembly and a middle beam assembly, and the middle beam assembly is provided with a connecting assembly. The patent aligns the pin with the pin hole, aligns the limit hole with the through hole, and inserts the limit rod through the through hole to connect the pin with the mounting seat. Nuts are then threaded onto both ends of the limit rod and tightened to secure the limit rod and subsequently install the support. Simultaneously, the side beam assembly aligns the limit seat with the slot seat, aligning the fixing hole with the threaded hole. Bolts are then threaded into the threaded hole and tightened to secure the limit seat and the side frame. However, the side frame structure in this patent cannot be adjusted in its installation angle. Due to factors such as building plan, structural form, roofing material, climate, customs, and architectural style, the slope requirements for the side frame vary from region to region. While the slope of the side frame in the aforementioned patent is fixed, an adjustable side frame slope, considering the flexibility and practicality of roof construction, is beneficial for adapting to varying needs.

[0004] Therefore, there is an urgent need for a large-span prefabricated building modular roof structure to solve the above problems. Summary of the Invention

[0005] 1. Problem to be solved

[0006] The purpose of the present invention is to solve the problem that the side frame plates of the existing roof structure are relatively poor in flexibility and difficult to adapt to the slope requirements of different regions. A large-span prefabricated building modular roof structure and its installation method are provided to solve the above problems.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0009] A modular roof structure for a large-span prefabricated building of the present invention comprises a shell, side frame panels, an adjustment assembly, and a reinforcement assembly. A plurality of side frame panels are movably mounted on the shell at equal intervals, wherein:

[0010] The adjusting assembly includes a loading shell and a lifting mechanism installed in the loading shell. The loading shell is arranged at the bottom of the shell. The lifting mechanism is individually provided with a rotating seat corresponding to each side frame plate. One end of the side frame plate can be rotatably installed in the inner cavity of the rotating seat, and the other end thereof is connected to the reinforcement assembly. A movable block is sleeved on the surface of the side frame plate. The outer side of the movable block is rotatably installed on one end of the stable plate, and the other end of the stable plate is fixedly connected to the shell. Through the design of the adjusting assembly, it is convenient to adjust the installation inclination angle of the side frame plate, that is, the slope of the roof slope, to meet the use requirements in different regions and climatic conditions. Compared with the existing conventional roof, it is more practical and more adaptable.

[0011] The reinforcing assembly includes a rotating seat 2 that is detachably mounted on the side frame plate. The rotating seat 2 is connected to the fixed seat via a telescopic rod. By arranging the reinforcing assembly, the side frame plate can be effectively supported to improve its stability.

[0012] As a further improvement of the present invention, the lifting mechanism includes a motor, a threaded rod and a threaded block. The motor is fixedly installed at one end of the carrier shell, and its output end is fixedly connected to the threaded rod; the threaded rod is arranged in the shell; the threaded block is sleeved on the surface of the threaded rod and is threadedly connected to the threaded rod, and the threaded block is fixedly connected to the rotating seat through the connecting block.

[0013] As a further improvement of the present invention, a plurality of threaded rods are provided, and the number of threaded rods is the same as that of the side frame plates. One of the threaded rods is fixedly connected to the motor output shaft through a driving pulley, and the remaining threaded rods are fixedly connected to the driven pulleys. The plurality of driven pulleys are connected to the driving pulley through belts. By using the pulleys and belts, synchronous adjustment of the plurality of side panel frames can be achieved, which greatly improves the adjustment efficiency. Most importantly, the consistency of the adjustment of each side panel frame is ensured to form a uniform roof structure with the same degree of inclination.

[0014] As a further improvement of the present invention, a linkage block is provided between any two adjacent threaded blocks, and the consistency of adjustment is further ensured by providing the linkage block.

[0015] As a further improvement of the present invention, connecting blocks are symmetrically provided on both sides of the threaded block, and guide grooves slidably connected to the connecting blocks are processed on the shell. The two connecting blocks pass through the side walls of the shell and extend out of the shell, and are respectively connected to the rotating seats arranged on both sides of the shell; the movement of the threaded blocks can be effectively guided by the cooperation of the connecting blocks and guide grooves arranged on both sides, thereby driving one end of the side frame plates on both sides of the shell to be synchronously raised to form a roof structure with a specific inclination angle, thereby realizing the adjustment of the slope of the side frame plates to meet different design requirements.

[0016] As a further improvement of the present invention, it also includes a rotating block, the telescopic rod includes a threaded tube and a second threaded rod, both ends of the rotating block are rotatably installed in the inner cavity of the second rotating seat, the rotating block is rotatably connected to the threaded tube, the inner cavity of the threaded tube is threadedly connected to the second threaded rod, one end of the second threaded rod extends to the outside of the threaded tube and is rotatably connected to the fixed seat.

[0017] As a further improvement of the present invention, inclined surfaces are symmetrically processed on both sides of the top of the shell; and the movable block is processed into a "U"-shaped structure.

[0018] As a further improvement of the present invention, it also includes an additional plate, which is detachably mounted on the end of the side frame plate to extend the side frame plate.

[0019] As a further improvement of the present invention, a groove is provided on one side of the side frame plate for inserting an additional plate, and the additional plate is also fixedly connected to the side frame plate by a fixing bolt, which is convenient for installation.

[0020] The method for installing a modular roof structure of a large-span prefabricated building of the present invention comprises the following steps:

[0021] Step 1: Determine the inclination angle of the roof structure slope and the lifting height of one end of the side frame according to the design requirements;

[0022] Step 2: Adjust the lifting mechanism to raise one end of the side frame to the height in step 1;

[0023] Step 3: According to the design requirements, determine the installation position of the rotating base 2, fix the rotating base 2, install the telescopic rod, and adjust the telescopic rod to the set length before fixing the fixed base on the mounting plate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The roof structure of the present invention optimizes its overall structure and, more specifically, provides an adjustment component and a reinforcement component, so that the large-span prefabricated building roof structure of the present invention has the advantages of adjustable slope and good stability. First, in actual use, the adjustment component can be used to adjust the inclination angle of the side frame, that is, the slope of the side frame, by starting the motor according to local building habits, thereby improving the flexibility of the building roof and adapting to local needs for the side frame. Secondly, after the side frame is adjusted, a rotating seat 2 is installed at the bottom of the side frame, and the threaded pipe is rotated according to actual conditions. When the length of the threaded pipe and the threaded rod 2 is adapted to the distance of the wall connection, the connection between the side frame and the side frame is strengthened, thereby improving the stability of the side frame. Therefore, it has a good market prospect and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the three-dimensional structure of the roof structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure after the additional plate and the side frame plate are disassembled in the present invention;

[0028] Figure 3 Schematic diagram of the installation structure of the threaded pipe in the present invention;

[0029] Figure 4 Schematic diagram of the installation structure of the threaded rod 1 in the present invention;

[0030] Figure 5 This is a schematic diagram of the installation structure of the rotating seat 2 in the present invention;

[0031] In the picture:

[0032] 1. Housing; 2. Carrier shell; 3. Motor; 4. Driving pulley; 5. Driven pulley; 6. Threaded rod 1; 7. Threaded block; 8. Connecting block; 9. Rotating seat 1; 10. Side frame; 11. Movable block; 12. Stabilizing plate; 13. Rotating seat 2; 14. Rotating block; 15. Threaded tube; 16. Threaded rod 2; 17. Fixed seat; 18. Mounting plate; 19. Heat dissipation hole; 20. Inclined surface; 21. Linking block; 22. Guide groove; 23. Groove; 24. Additional plate; 25. Fixing bolt 1; 26. Fixing bolt 2. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0034] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] At the same time, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0036] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0037] Example 1

[0038] like Figure 1 As shown, a large-span modular roof structure for prefabricated buildings in this embodiment includes a housing 1 and side frames 10. A plurality of side frames 10 are symmetrically disposed on both sides of the housing 1 and spaced evenly apart. Each side frame 10 is movably mounted on either side of the housing 1 via an adjustment assembly. The design of the adjustment assembly allows for flexible adjustment of the slope of the side frames 10, facilitating adaptation to different usage scenarios.

[0039] Specifically, such as Figure 2 and Figure 4As shown, the adjustment assembly includes a carrier shell 2, which is fixedly mounted to the bottom of the housing 1. A lifting mechanism is provided within the carrier shell 2. Each side frame 10 is individually provided with a rotating seat 9, corresponding to the lifting mechanism. The ends of the side frame 10 are rotatably mounted within the inner cavity of the rotating seat 9. The rotating seat 9 not only connects the side frames 10 but, most importantly, adjusts the position of the rotating seat 9 by adjusting the lifting mechanism, thereby driving the end of the side frame 10 connected to the rotating seat 9 to move upward or downward. Accordingly, as one end of the side frame 10 moves upward or downward, the side frame 10 as a whole rotates relative to the rotating seat 9, forming an angle between the side frame 10 and the vertically disposed housing 1. Taking a horizontally placed side frame 10 as an example, when the rotating seat 19 moves upward, one end of the side frame 10 moves upward accordingly, and the side frame 10 as a whole rotates downward relative to the inner cavity of the rotating seat 19, forming an angle between the side frame 10 and the shell 1, and forming a roof structure with a certain slope. Conversely, when the end of the side frame 10 is at a certain height and the installation slope of the side frame 10 needs to be reduced, the rotating seat 19 is directly moved downward, driving the end of the side frame 10 downward. As the rotating seat 19 moves downward, the side frame 10 as a whole rotates upward relative to the inner cavity of the rotating seat 19, the angle between the side frame 10 and the shell 1 increases, and the installation slope of the side frame 10 is reduced. The roof structure of the present invention can adjust the inclination angle of the side frame 10, that is, realize the slope adjustment of the side frame 10, improve the flexibility of the prefabricated building roof structure, and can adapt to the installation requirements of the side frame 10 in different regions.

[0040] like Figure 2 As shown, a single side frame panel 10 is used as an example for description; the structure and installation method of the remaining side frame panels 10 are identical. The end of the side frame panel 10, away from the first rotating seat 9, is connected to a reinforcement assembly. The reinforcement assembly includes a second rotating seat 13 detachably mounted on the side frame panel 10, which is connected to a fixed seat 17 via a telescopic rod. The provision of the reinforcement assembly effectively supports the side frame panel 10, effectively improving the stability of the side frame panel 10 and thereby enhancing the stability of the entire building roof structure.

[0041] At the same time, each side frame 10 is individually sheathed with a movable block 11. The inner cavity of the movable block 11 is smooth and forms a sliding connection with the side frame 10. One side wall of the movable block 11 is rotatably mounted on a stabilizing plate 12, the other end of which is fixedly connected to the housing 1. With this design, when the slope of the side frame 10 is adjusted, the movable block 11 is connected to the housing 1 via the stabilizing plate 12, providing support for the side frame 10, effectively improving the support stability of the side frame 10 and ensuring its structural strength and stability. Specifically, when the adjustment assembly is used to adjust the slope of the side frame 10, taking the upward movement of one end of the side frame 10 as an example, when the side frame 10 moves upward, since the movable block 11 is connected to the housing 1 via the stabilizing plate 12, the movable block 11 rotates relative to the stabilizing plate 12, causing the side frame 10 to slide within the inner cavity of the movable block 11, thereby compensating for the distance caused by the tilt of the movable block 11. The movable block 11 not only limits the movement trajectory of the side frame plate 10, but also further supports the side frame plate 10, thereby ensuring the stability of the installation of the side frame plate 10.

[0042] As a further design of this embodiment, the movable block 11 in this embodiment is processed into a "U"-shaped structure, and the size of its inner cavity is slightly larger than the size of the side frame plate 10 to ensure that the side frame plate 10 can slide in the inner cavity of the movable block 11. The structural design of the movable block 11 ensures that the side frame plate 10 can slide smoothly during the adjustment process, and at the same time, it also fits more closely to the surface of the side frame plate 10, thereby improving the supporting effect on the side frame plate 10.

[0043] Example 2

[0044] The present embodiment is a modular roof structure of a large-span assembled building, and its structure is basically the same as that of the embodiment 1, with the main difference being that the lifting mechanism includes a motor 3, a threaded rod 6 and a threaded block 7. Figure 2 and Figure 4 As shown, the motor 3 is fixedly mounted on one end of the carrier housing 2. A plurality of heat dissipation holes 19 are provided on the front side of the carrier housing 2. The heat dissipation holes 19 dissipate heat from the inner cavity of the carrier housing 2, thereby extending the service life of the motor 3.

[0045] The ends of the threaded rod 6 are rotatably mounted within the housing 1. The output end of the motor 3 is fixedly connected to the end of the threaded rod 6 extending out of the housing 1. The threaded block 7 is sleeved onto the surface of the threaded rod 6 and threadedly connected to the threaded rod 6. The threaded block 7 is fixedly connected to the rotating seat 9 via a connecting block 8. By starting the motor 3, the threaded rod 6 is rotated. Simultaneously, the threaded block 7 is limited by the connecting block 8. As the threaded rod 6 rotates, the threaded block 7 moves upward or downward along the threaded rod 6, driving the connecting block 8 and the rotating seat 9 upward or downward, thereby adjusting the upward or downward movement of the end of the side frame plate 10 and, in turn, adjusting the slope of the side frame plate 10.

[0046] More optimally, in order to achieve synchronous adjustment of multiple side frame panels 10 and ensure consistent roof slope quality, the present invention employs multiple threaded rods 6, the number of which is equal to the number of side frame panels 10. One threaded rod 6, located near the end of the cargo housing 2, near the motor 3, is fixedly connected to the output shaft of the motor 3 via a driving pulley 4. The remaining threaded rods 6 are each individually fixedly connected to driven pulleys 5, each of which is connected to the driving pulley 4 via belts. When the drive motor 3 rotates, the driving pulley 4 also rotates, which, through the belt connection, drives the multiple driven pulleys 5 to rotate, thereby achieving synchronous rotation control of the multiple threaded rods 6 and achieving simultaneous adjustment of all side frame panels 10.

[0047] As a further design of this embodiment, a connecting block 21 is provided between any two adjacent threaded blocks 7. Through the setting of the connecting block 21, a plurality of threaded blocks 7 are connected, so that the plurality of threaded blocks 7 can move synchronously, thereby ensuring the consistency of the slope adjustment of all side frame plates 10.

[0048] like Figure 1 As shown, connecting blocks 8 are symmetrically provided on either side of the threaded block 7. The two connecting blocks 8 are disposed on either side of the housing 1, each penetrating the sidewall of the housing 2 and extending outside the housing 1. The two connecting blocks 8 are connected to the side frame plates 10 disposed on either side of the housing 1 via a rotating seat 9. Furthermore, longitudinal guide grooves 22 are machined on the housing 1 corresponding to the connecting blocks 8. The connecting blocks 8 are slidably mounted within the guide grooves 22. Due to the provision of the guide grooves 22, the connecting blocks 8 slide within the inner cavity of the guide grooves 22 during movement, thereby limiting and guiding the connecting blocks 8.

[0049] In addition, more optimally, both sides of the top of the housing 1 of this embodiment are provided with a smooth inclined surface 20. In this embodiment, the inclined surface 20 is provided to facilitate the guidance of rainwater.

[0050] Example 3

[0051] The present embodiment is a modular roof structure of a large-span assembled building, and its structure is basically the same as that of the embodiment 2, with the main difference being that the reinforcement assembly further includes a rotating block 14, and the telescopic rod includes a threaded tube 15 and a threaded rod 16. Figure 3 and Figure 5 As shown, both ends of the rotating block 14 are rotatably installed in the inner cavity of the rotating seat 13, one side of the rotating block 14 is rotatably connected to the threaded tube 15, the inner cavity of the threaded tube 15 is threadedly connected to the threaded rod 16, one end of the threaded rod 16 extends to the outside of the threaded tube 15 and is rotatably connected to the fixed seat 17, and one side of the fixed seat 17 is fixedly connected to the mounting plate 18.

[0052] like Figure 2-3 and Figure 5 As shown, the side frame plate 10 also includes an additional plate 24, which is removably mounted on the end of the side frame plate 10. Specifically, in the present invention, a groove 23 is provided on one side of the side frame plate 10 for inserting the additional plate 24, and the additional plate 24 is also fixed to the side frame plate 10 via fixing bolts 25. Both sides and the top of the groove 23 are fixed to the additional plate 24 via fixing bolts 25. Through the coordinated use of the groove 23, the additional plate 24, and the fixing bolts 25, if the side frame plate 10 is not long enough, one side of the additional plate 24 can be placed in the inner cavity of the groove 23, and the side frame plate 10 and the additional plate 24 can be fixed using fixing bolts 25, thereby extending the side frame plate 10.

[0053] Furthermore, second fixing bolts 26 are provided through both sides of the bottom of the second rotating base 13, and the second rotating base 13 is detachably connected to the side frame plate 10 via the second fixing bolts 26. In this embodiment, the provision of the second fixing bolts 26 facilitates the installation and fixation of the second rotating base 13. Furthermore, the second rotating base 13 can be further positioned to a desired position and then fixed using the second fixing bolts 26, thereby increasing the flexibility of the second rotating base 13.

[0054] A method for installing a modular roof structure of a large-span prefabricated building according to the present invention comprises the following steps:

[0055] Step 1: When constructing the roof, the inclination angle of the roof structure slope can be determined according to the actual matching scenario and design requirements, and the lifting height of one end of the side frame plate 10 can be determined;

[0056] Step 2: Adjust the lifting mechanism to raise one end of the side frame plate 10 to the height in step 1;

[0057] When the driving pulley 4 rotates, the driven pulley 5 is driven to rotate by the transmission of the belt. When the driving pulley 4 and the driven pulley 5 rotate, the threaded rod 6 can be driven to rotate. When the threaded rod 6 rotates, the threaded block 7 is driven to move upward through the thread on the surface and the cooperation of the guide groove 22. When the threaded block 7 moves upward, the side frame plate 10 is driven to move upward through the transmission of the connecting block 8 and the rotating seat 9. Since the surface of the side frame plate 10 is movably connected with the movable block 11, the side frame plate 10 will rotate downward in the inner cavity of the rotating seat 9 under the action of the movable block 11, and then the movable block 11 will rotate on one side of the stable plate 12, and then the side frame plate 10 will slide in the inner cavity of the movable block 11, thereby compensating for the distance caused by the tilt of the movable block 11. Therefore, the movement trajectory of the side frame plate 10 at this time is to rotate downward in the inner cavity of the rotating seat 9. After rotating to a suitable angle, the motor 3 is turned off, thereby adjusting the inclination angle of the roof.

[0058] Step 3: Determine the installation position of the second rotating seat 13 according to the design requirements, fix the second rotating seat 13, install the telescopic rod, and adjust the telescopic rod to the set length before fixing the fixing seat 17 on the mounting plate 18.

[0059] Specifically, according to the design requirements, after selecting a suitable position, the rotating seat 13 is installed by fixing the bolt 26, and then the threaded tube 15 is rotated. The threaded tube 15 will rotate on one side of the rotating block 14. When the threaded tube 15 rotates, it will drive the threaded rod 16 to gradually move toward the outside of the threaded tube 15. When the threaded rod 16 moves, it drives the fixed seat 17 and the mounting plate 18 to move. Then, the rotating block 14 can be rotated in the inner cavity of the rotating seat 13, and the threaded rod 16 rotates in the inner cavity of the fixed seat 17 to adjust the mounting plate 18 to a vertical state. Then, the mounting plate 18 is positioned. This process serves to improve the support of the side frame plate 10.

[0060] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A modular roof structure for a large-span assembled building, comprising a shell (1) and side frame plates (10), wherein a plurality of side frame plates (10) are movably mounted at equal intervals on the shell (1), characterized in that: Also included are an adjustment assembly and a reinforcement assembly, wherein: The adjustment assembly includes a loading shell (2) and a lifting mechanism installed in the loading shell (2), the loading shell (2) is arranged at the bottom of the shell (1), and the lifting mechanism is individually provided with a rotating seat (9) corresponding to each side frame plate (10), one end of the side frame plate (10) can be rotatably installed in the inner cavity of the rotating seat (9), and the other end thereof is connected to the reinforcement assembly; a movable block (11) is sleeved on the surface of the side frame plate (10), and the outer side of the movable block (11) is rotatably installed on one end of the stabilizing plate (12), and the other end of the stabilizing plate (12) is fixedly connected to the shell (1); The reinforcing assembly includes a second rotating seat (13) detachably mounted on the side frame plate (10), and the second rotating seat (13) is connected to the fixed seat (17) via a telescopic rod; The lifting mechanism comprises a motor (3), a threaded rod (6) and a threaded block (7); the motor (3) is fixedly mounted on one end of the carrier shell (2), and its output end is fixedly connected to the threaded rod (6); the threaded rod (6) is arranged in the shell (1); the threaded block (7) is sleeved on the surface of the threaded rod (6) and is threadedly connected to the threaded rod (6), and the threaded block (7) is fixedly connected to the rotating seat (9) through the connecting block (8); Connecting blocks (8) are symmetrically provided on both sides of the threaded block (7); a guide groove (22) is machined on the housing (1) and is slidably connected to the connecting blocks (8); the two connecting blocks (8) penetrate the side wall of the housing (1) and extend out of the housing (1) and are respectively connected to the rotating seat (9) on both sides of the housing (1).

2. A modular roof structure for a large-span prefabricated building according to claim 1, characterized in that: The threaded rods (6) are provided in plurality, and the number of the threaded rods (6) is the same as that of the side frame plate (10), wherein one threaded rod (6) is fixedly connected to the output shaft of the motor (3) through the driving pulley (4), and the remaining threaded rods (6) are fixedly connected to the driven pulley (5), and the plurality of driven pulleys (5) are connected to the driving pulley (4) through belts.

3. The large-span modular roof structure of prefabricated buildings according to claim 2 is characterized in that: A linkage block (21) is further provided between any two adjacent threaded blocks (7).

4. A large-span prefabricated building modular roof structure according to any one of claims 1 to 3, characterized in that: The telescopic rod further comprises a rotating block (14), wherein the telescopic rod comprises a threaded tube (15) and a second threaded rod (16), wherein both ends of the rotating block (14) are rotatably mounted in the inner cavity of the second rotating seat (13), the rotating block (14) is rotatably connected to the threaded tube (15), the inner cavity of the threaded tube (15) is threadedly connected to the second threaded rod (16), and one end of the second threaded rod (16) extends to the outside of the threaded tube (15) and is rotatably connected to the fixed seat (17).

5. A large-span prefabricated building modular roof structure according to any one of claims 1 to 3, characterized in that: The top of the shell (1) is symmetrically processed with inclined surfaces (20); and the movable block (11) is processed into a "U"-shaped structure.

6. A large-span prefabricated building modular roof structure according to any one of claims 1 to 3, characterized in that: It also includes an additional plate (24), which is detachably mounted on the end of the side frame plate (10).

7. The large-span modular roof structure of prefabricated buildings according to claim 6, characterized in that: A groove (23) is provided on one side of the side frame plate (10) for inserting an additional plate (24), and the additional plate (24) is also fixedly connected to the side frame plate (10) via a fixing bolt (25).

8. A method for installing a modular roof structure of a large-span prefabricated building according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Determine the inclination angle of the roof structure slope according to the design requirements and determine the lifting height of one end of the side frame plate (10); Step 2: Adjust the lifting mechanism so that one end of the side frame plate (10) is raised to the height in step 1; Step 3: Determine the installation position of the rotating seat 2 (13) according to the design requirements, fix the rotating seat 2 (13), install the telescopic rod, and adjust the telescopic rod to the set length before fixing the fixed seat (17) on the mounting plate (18).

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