Industrial building post-cast strip tray butterfly-shaped double-helix jacking device and construction method

Abstract

The invention discloses an industrial building post-cast strip tray butterfly-shaped double-helix jacking device and a construction method, and belongs to the technical field of post-cast strip jacking. The device comprises a lower spiral seat, an upper spiral seat and a supporting base are sequentially arranged at the upper end and the lower end of the lower spiral seat, threaded columns are arranged at the upper end and the lower end of the lower spiral seat, the two threaded columns extend to the inner sides of the upper spiral seat and the supporting base respectively, and the lower spiral seat is in threaded connection with the upper spiral seat and the supporting base through the threaded columns. Integral lifting of the device is achieved through integral rotation of the lower spiral base, meanwhile, the height of the upper spiral base can be finely adjusted on the upper threaded column independently, and the precise supporting requirements of post-cast strip formworks with different elevations are met; a plurality of limiting grooves are formed in the peripheries of the rotary knob A and the rotary knob B and matched with limiting blocks of the limiting seats, the rotary knob A or the rotary knob B can be automatically clamped into the limiting grooves after being adjusted in place, mechanical locking is achieved, retreating or loosening under the construction vibration or load effect is prevented, and supporting safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of post-cast strip support technology, specifically to a butterfly-shaped double-helix support device for post-cast strip trays in industrial buildings and its construction method. Background Technology

[0002] A post-pouring strip is a concrete strip left at a corresponding location on beams, slabs (foundation slabs), or walls during building construction to prevent harmful cracks from forming in cast-in-place reinforced concrete structures due to temperature changes, uneven shrinkage, uneven settlement, or construction requirements, in accordance with design or construction specifications. The conventional practice in building construction is to construct an independent full-span support frame at the post-pouring location and on both sides, and then pour the post-pouring strip after a specified period.

[0003] Patent No. CN218346961U discloses a support rod for post-pouring strip formwork. By setting several scale lines at intervals on both sides of the top of the main support rod, workers can use the scale lines to control the position of the fine-tuning screw on the main support rod when adjusting the height of the top support. This ensures that all top supports are at the same height, and that all support rods provide consistent support to the post-pouring strip formwork. This avoids the problem of inconsistent formwork deformation caused by inconsistent support during the pouring of the post-pouring strip, resulting in better concrete forming of the poured post-pouring strip. However, existing post-pouring strip formwork support devices mostly have a one-piece contact surface, making it difficult to adjust the support area of ​​the support device according to different post-pouring strips. Furthermore, the small contact area with the post-pouring strip during construction can easily lead to uneven formwork deformation, support failure, or structural instability during concrete pouring, affecting the forming quality of the post-pouring strip and construction safety. Summary of the Invention

[0004] The purpose of this invention is to provide a butterfly-shaped double-helix top support device and construction method for post-pouring strip trays in industrial buildings, in order to solve the problems mentioned in the background art. The contact surface of the existing post-pouring strip formwork support devices is mostly an integral structure, which makes it difficult to adjust the support area of ​​the support device according to different post-pouring strips. Furthermore, the small contact area with the post-pouring strip during construction leads to uneven formwork deformation, support failure, or structural instability during concrete pouring, affecting the forming quality of the post-pouring strip and construction safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings includes a lower helical seat. An upper helical seat and a support base are sequentially arranged at the upper and lower ends of the lower helical seat. Threaded posts are provided at both ends of the lower helical seat, extending to the inner sides of the upper helical seat and the support base, respectively. The lower helical seat is threadedly connected to the upper helical seat and the support base via the threaded posts. A top plate is provided above the upper helical seat at the top of the lower helical seat. Extension seats A are movably connected to both ends of the top plate. A transmission assembly A is located at the center of the two extension seats A at the top of the top plate, connecting the two extension seats A to the top plate. Extension seats B are movably connected to both sides of the top of the upper helical seat. A guide block is provided on one side of each extension seat B. A guide seat is located below the guide block at the front end face of the upper helical seat, with the bottom end of the guide block extending to the guide seat. Inside the guide seat, at the intersection of the two guide blocks, a transmission component B is located at the front end of the guide seat. The transmission component B is used to connect the two extension seats A and the upper spiral seat. The transmission component A includes a knob A, the output end of which is fixedly connected to a transmission rod. The bottom end of the transmission rod is rotatably connected to a lead screw. The two ends of the lead screw extend to the outside of the two extension seats A and are rotatably connected to the top plate. When the knob A drives the transmission rod to rotate, the transmission rod, in conjunction with the lead screw, drives the two extension seats A to extend on the top surface of the top plate. The transmission component B includes a knob B, the output end of which is located inside the upper spiral seat and is equipped with a transmission gear. The upper and lower ends of the transmission gear are each equipped with a rack on one side of the two guide blocks. The transmission gear meshes with the two racks. When the knob B drives the transmission gear to rotate, the transmission gear, in conjunction with the racks, drives the two extension seats B to extend on the outside of the upper spiral seat.

[0007] Preferably, each of the four ends of the bottom surface of the support base is provided with a connecting seat, and one end of the connecting seat is provided with a bolt hole. A bolt can be inserted into the inside of the bolt hole. When the support base is placed in a suitable position, the support base can be fixedly connected to the ground through the connecting seat.

[0008] Preferably, both the support base and the upper spiral seat have through holes at their center positions. The inner wall of the through hole is provided with internal threads. The lower spiral seat and the threaded post are an integral structure. The two threaded posts extend to the inner side of the through hole and mesh with the internal threads. When the lower spiral seat rotates, the lower spiral seat, in conjunction with the bottom threaded post, drives the top plate to move up and down at the top of the support base. When the upper spiral seat rotates outside the threaded post at the top of the lower spiral seat, the upper spiral seat can move up and down outside the threaded post.

[0009] Preferably, bevel gears are provided at the bottom end of the transmission rod and the center position of the lead screw. The transmission rod and the lead screw are connected by bevel gear transmission. When knob A drives the transmission rod to rotate, the transmission rod, in conjunction with the bevel gear, drives the lead screw to rotate.

[0010] Preferably, the lead screw is a double-threaded lead screw with symmetrical threads at both ends. When the lead screw rotates, it drives the two extension seats A to move relative to each other. As the two extension seats A extend outwards from the top plate, the support area of ​​the top plate can be increased.

[0011] Preferably, a displacement groove is provided on the top surface of the top plate below the extension seat A. When the transmission component A, together with the knob A, the transmission rod and the lead screw, drives the two extension seats A to move, the two extension seats A are displaced inside the displacement groove.

[0012] Preferably, the two extension seats B and the guide blocks are integrated into one structure. The racks on one side of the two guide blocks are symmetrical about the transmission gear. When the knob B drives the transmission gear to rotate, the transmission gear drives the two guide blocks to move inside the guide seat through the two racks.

[0013] Preferably, one end of knob A and knob B is provided with a limiting seat on the top surface of the top plate and the front end of the guide seat, and one end of knob A and knob B passes through the limiting seat and is rotatably connected to the top plate and the guide seat respectively.

[0014] Preferably, there are eight limiting grooves on the outer side of both knob A and knob B, which are evenly distributed on the outer side of knob A and knob B. Limiting blocks are movably connected to both sides of the top surface of the limiting seat. One end of the limiting block is the same shape and size as the limiting groove. The bottom end of the limiting block is fixedly connected to a connecting spring on the inner side of the limiting seat. When knob A or knob B is rotated to a suitable angle, the limiting block cooperates with the connecting spring to engage with the inner side of the limiting groove.

[0015] A construction method for a butterfly-shaped double-helix jacking device for post-cast strip trays in industrial buildings, the specific operation is as follows:

[0016] Step 1: Place the device in a suitable position. Connecting seats are provided at all four ends of the bottom surface of the support base. One end of the connecting seat has a bolt hole, and a bolt can be inserted into the inside of the bolt hole. When the support base is placed in a suitable position, the support base can be fixedly connected to the ground through the connecting seats.

[0017] Step 2: Both the upper and lower ends of the lower spiral seat are equipped with threaded columns. When the lower spiral seat rotates, the lower spiral seat, in conjunction with the bottom threaded column, drives the top plate to move up and down at the top of the support base. When the upper spiral seat rotates outside the threaded column at the top of the lower spiral seat, the upper spiral seat can move up and down outside the threaded column, which is convenient for adjusting the height of the device according to the post-pouring strip template of different heights.

[0018] Step 3: By rotating knob A on the top surface of the top plate, knob A, in conjunction with the transmission rod and lead screw, drives the two extension seats A to move relative to each other. Also, by rotating knob B on the outside of the upper spiral seat, knob B, in conjunction with the transmission gear and rack, drives the two extension seats B to extend on the outside of the upper spiral seat. This expands the support surface of the device in both directions of the X and Y axes, forming a "butterfly" support profile, which significantly improves the load-bearing area and anti-overturning ability.

[0019] Step 4: Limit seats are provided on the outer sides of both knobs A and B. One end of knobs A and B passes through the limit seats and is rotatably connected to the top plate and guide seat, respectively. When knob A or knob B is rotated to a suitable angle, the limit blocks on both sides of the top surface of the limit seat, in conjunction with the connecting spring, are engaged in the limit grooves on the outer wall of knob A or knob B, thereby facilitating the locking of knob A or knob B and improving the stability of the device.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention achieves overall lifting and lowering of the device by rotating the lower spiral seat as a whole, while the upper spiral seat can be individually adjusted in height on the upper threaded column to meet the precise support requirements of the post-pouring strip template at different elevations, thereby improving construction adaptability and installation accuracy.

[0022] 2. The present invention controls the extension seat A to unfold in the X-axis direction by driving the lead screw through the knob A in the transmission component A, and controls the extension seat B to unfold in the Y-axis direction by driving the gear and rack mechanism through the knob B in the transmission component B, thereby realizing the bidirectional expansion of the top plate support, significantly increasing the bearing area, effectively dispersing the load, and improving the overall stability and anti-overturning ability.

[0023] 3. The present invention has multiple limiting grooves on the outer periphery of knobs A and B. With the limiting block of the limiting seat, the knobs A or B can be automatically locked into the limiting grooves after being adjusted to the correct position, thereby achieving mechanical locking and preventing backing or loosening under construction vibration or load, thus ensuring the safety of the support. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the top plate structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the upper screw seat structure of the present invention;

[0028] Figure 5This is a schematic diagram of the limiting seat structure of the present invention.

[0029] In the diagram: 1. Support base; 2. Lower screw seat; 3. Threaded column; 4. Top plate; 5. Extension seat A; 6. Knob A; 7. Limit block; 8. Limit seat; 9. Upper screw seat; 10. Extension seat B; 11. Guide block; 12. Guide seat; 13. Knob B; 15. Connecting spring; 16. Lead screw; 17. Transmission rod; 18. Transmission gear; 19. Rack; 20. Limit groove. Detailed Implementation

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

[0031] Please see Figure 1-5 This invention provides a butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings, including a lower helical seat 2. An upper helical seat 9 and a support base 1 are sequentially arranged at the upper and lower ends of the lower helical seat 2. Threaded posts 3 are provided at both ends of the lower helical seat 2, extending to the inner sides of the upper helical seat 9 and the support base 1 respectively. The lower helical seat 2 is threadedly connected to the upper helical seat 9 and the support base 1 via the threaded posts 3. A top plate 4 is provided above the upper helical seat 9 at the top of the lower helical seat 2. Extension seats A5 are movably connected to both ends of the top plate 4. The two extension seats A5... A transmission assembly A is located at the top of the top plate 4 at the center position. The transmission assembly A is used to connect the two extension seats A5 to the top plate 4. Extension seats B10 are movably connected to both sides of the top of the upper spiral seat 9. A guide block 11 is provided on one side of the two extension seats B10. A guide seat 12 is provided below the guide block 11 at the front end of the upper spiral seat 9. The bottom end of the guide block 11 extends to the inner side of the guide seat 12. A transmission assembly B is provided at the intersection of the two guide blocks 11 at the front end of the guide seat 12. The transmission assembly B is used to connect the two extension seats A5 to the upper spiral seat 9.

[0032] The transmission assembly A includes a knob A6. The output end of the knob A6 is fixedly connected to a transmission rod 17. The bottom end of the transmission rod 17 is rotatably connected to a lead screw 16. The two ends of the lead screw 16 extend to the outside of the two extension seats A5 and are rotatably connected to the top plate 4. When the knob A6 drives the transmission rod 17 to rotate, the transmission rod 17 cooperates with the lead screw 16 to drive the two extension seats A5 to extend on the top surface of the top plate 4.

[0033] The transmission assembly B includes a knob B13. The output end of the knob B13 is located inside the upper screw seat 9 and a transmission gear 18 is provided. The upper and lower ends of the transmission gear 18 are each provided with a rack 19 on one side of the two guide blocks 11. The transmission gear 18 meshes with the two racks 19. When the knob B13 drives the transmission gear 18 to rotate, the transmission gear 18, in conjunction with the racks 19, drives the two extension seats B10 to extend outside the upper screw seat 9.

[0034] In this embodiment, each of the four ends of the bottom surface of the support base 1 is provided with a connecting seat. One end of the connecting seat is provided with a bolt hole, and a bolt can be inserted into the inner side of the bolt hole. When the support base 1 is placed in a suitable position, the support base 1 can be fixedly connected to the ground through the connecting seat. The center positions of the support base 1 and the upper screw seat 9 are both provided with through holes, and the inner wall of the through hole is provided with internal threads. The lower screw seat 2 and the threaded post 3 are an integral structure. The two threaded posts 3 extend to the inner side of the through hole, and the two threaded posts 3 mesh with the internal threads. When the lower screw seat 2 rotates, the lower screw seat 2 engages with the bottom end. The threaded column 3 drives the top plate 4 to move up and down at the top of the supporting base 1. When the upper screw seat 9 rotates outside the threaded column 3 at the top of the lower screw seat 2, the upper screw seat 9 can move up and down outside the threaded column 3. Bevel gears are provided at the bottom of the transmission rod 17 and the center of the lead screw 16. The transmission rod 17 and the lead screw 16 are connected by bevel gear transmission. When the knob A6 drives the transmission rod 17 to rotate, the transmission rod 17, in conjunction with the bevel gear, drives the lead screw 16 to rotate. The lead screw 16 is a double-ended threaded lead screw, with the threads at both ends of the lead screw 16 being symmetrical. When the lead screw 16 rotates... When in motion, the lead screw 16 drives the two extension seats A5 to move relative to each other. As the two extension seats A5 extend outwards from the top plate 4, the supporting area of ​​the top plate 4 is increased. A displacement groove is provided below the extension seats A5 on the top surface of the top plate 4. When the transmission assembly A, in conjunction with the knob A6, transmission rod 17, and lead screw 16, drives the two extension seats A5, the two extension seats A5 move within the displacement groove. The upper surfaces of the top plate 4 and the extension seats A5 are provided with an anti-slip structure, which consists of raised textures, rubber pads, or removable anti-slip sheets, used to enhance the connection with the post-pouring strip template. To reduce friction between the guide blocks and guides, the two extension seats B10 and guide blocks 11 are integrated into one structure. The racks 19 on one side of the two guide blocks 11 are symmetrical about the transmission gear 18. When the knob B13 drives the transmission gear 18 to rotate, the transmission gear 18 drives the two guide blocks 11 to move inside the guide seat 12 through the two racks 19. The inner walls of the guide seat 12 and the top plate 4 are fitted with self-lubricating bushings or have lubricating oil grooves to reduce the frictional resistance and wear of the guide blocks 11 and extension seats A5 during the sliding process.

[0035] In this embodiment, one end of knob A6 and knob B13 is provided with a limiting seat 8 on the top surface of the top plate 4 and the front end of the guide seat 12. One end of knob A6 and knob B13 passes through the limiting seat 8 and is rotatably connected to the top plate 4 and the guide seat 12 respectively. Limiting grooves 20 are provided on the outer side of knob A6 and knob B13. There are eight limiting grooves 20, which are evenly distributed on the outer side of knob A6 and knob B13. Limiting blocks 7 are movably connected to both sides of the top surface of the limiting seat 8. One end of the limiting block 7 is the same shape and size as the limiting groove 20. The bottom end of the limiting block 7 is fixedly connected to the connecting spring 15 on the inner side of the limiting seat 8. When knob A6 or knob B13 is rotated to a suitable angle, the limiting block 7 cooperates with the connecting spring 15 to be inserted into the inner side of the limiting groove 20.

[0036] During operation, the device is placed in a suitable position. Connecting seats are provided at all four ends of the bottom surface of the support base 1, with bolt holes at one end for inserting bolts. When the support base 1 is in the appropriate position, it can be fixedly connected to the ground via the connecting seats. Threaded posts 3 are provided at both the upper and lower ends of the lower spiral seat 2. When the lower spiral seat 2 rotates, it, in conjunction with the bottom threaded posts 3, drives the top plate 4 to move up and down at the top of the support base 1. When the upper spiral seat 9 rotates outside the threaded posts 3 at the top of the lower spiral seat 2, it can move up and down outside the threaded posts 3, facilitating adjustment of the device height according to different heights of the post-cast strip template. Rotating the knob A6 on the top surface of the top plate 4, the knob A6, in conjunction with the transmission rod 17 and the lead screw 16, drives the two extension seats A5 to move relative to each other. Furthermore, by rotating the knob B13 on the outside of the upper spiral seat 9, the knob B13, in conjunction with the transmission gear 18 and rack 19, drives the two extension seats B10 to extend on the outside of the upper spiral seat 9, thereby expanding the bidirectional expansion of the device's support surface in the X and Y axes, forming a "butterfly" support profile, significantly improving the load-bearing area and anti-overturning ability. Moreover, both knobs A6 and B13 are provided with limit seats 8 on their outer sides. One end of knobs A6 and B13 passes through the limit seat 8 and is rotatably connected to the top plate 4 and guide seat 12 respectively. When knob A6 or knob B13 is rotated to a suitable angle, the limit blocks 7 on both sides of the top surface of the limit seat 8, in conjunction with the connecting spring 15, are engaged in the limit groove 20 on the outer wall of knob A6 or knob B13, thereby facilitating the locking of knob A6 or knob B13 and improving the stability of the device.

[0037] In summary, this invention achieves overall lifting and lowering of the device through the rotation of the lower spiral seat, while the upper spiral seat can be individually adjusted in height on the upper threaded column to meet the precise support requirements of post-cast strip templates at different elevations, improving construction adaptability and installation accuracy. The extension seat A is controlled to expand in the X-axis direction by the screw driven by knob A in transmission component A, and the extension seat B is controlled to expand in the Y-axis direction by the gear and rack mechanism driven by knob B in transmission component B, achieving bidirectional expansion of the top plate support, significantly increasing the bearing area, effectively dispersing the load, and improving overall stability and anti-overturning capability. Multiple limiting grooves are provided on the outer periphery of knobs A and B, which, in conjunction with the limiting blocks of the limiting seats, automatically engage with the limiting grooves after knobs A or B are adjusted to the correct position, achieving mechanical locking and preventing backing or loosening under construction vibration or load, ensuring support safety.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings, comprising a lower helical seat (2), characterized in that: The lower screw seat (2) is provided with an upper screw seat (9) and a support base (1) at its upper and lower ends respectively. Threaded posts (3) are provided at both ends of the lower screw seat (2). The two threaded posts (3) extend to the inner sides of the upper screw seat (9) and the support base (1) respectively. The lower screw seat (2) is threadedly connected to the upper screw seat (9) and the support base (1) through the threaded posts (3). A top plate (4) is provided above the upper screw seat (9) at the top of the lower screw seat (2). Extension seats A (5) are movably connected to both ends of the top plate (4). The center of the two extension seats A (5) is located at the top of the top plate (4) and a transmission is provided. The moving component A and the transmission component A are used to connect the two extension seats A (5) and the top plate (4). The two sides of the top of the upper spiral seat (9) are movably connected to the extension seats B (10). A guide block (11) is provided on one side of the two extension seats B (10). A guide seat (12) is provided below the guide block (11) on the front end face of the upper spiral seat (9). The bottom end of the guide block (11) extends to the inner side of the guide seat (12). The intersection of the two guide blocks (11) is located at the front end of the guide seat (12) and the transmission component B is provided. The transmission component B is used to connect the two extension seats A (5) and the upper spiral seat (9). The transmission assembly A includes a knob A (6), the output end of which is fixedly connected to a transmission rod (17), the bottom end of which is rotatably connected to a lead screw (16), the two ends of which extend to the outside of the two extension seats A (5) and are rotatably connected to the top plate (4). When the knob A (6) drives the transmission rod (17) to rotate, the transmission rod (17) cooperates with the lead screw (16) to drive the two extension seats A (5) to extend on the top surface of the top plate (4). The transmission assembly B includes a knob B (13). The output end of the knob B (13) is located inside the upper screw seat (9) and a transmission gear (18) is provided. The upper and lower ends of the transmission gear (18) are located on one side of the two guide blocks (11) and racks (19) are provided. The transmission gear (18) meshes with the two racks (19). When the knob B (13) drives the transmission gear (18) to rotate, the transmission gear (18) cooperates with the racks (19) to drive the two extension seats B (10) to extend outside the upper screw seat (9).

2. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: The support base (1) has connecting seats at all four ends of its bottom surface. One end of the connecting seat has a bolt hole, and a bolt can be inserted into the inside of the bolt hole. When the support base (1) is placed in a suitable position, the support base (1) can be fixedly connected to the ground through the connecting seat.

3. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: Both the support base (1) and the upper spiral seat (9) have through holes at their center positions. The inner wall of the through hole is provided with internal threads. The lower spiral seat (2) and the threaded column (3) are an integral structure. The two threaded columns (3) extend to the inner side of the through hole. The two threaded columns (3) mesh with the internal threads. When the lower spiral seat (2) rotates, the lower spiral seat (2) cooperates with the bottom threaded column (3) to drive the top plate (4) to move up and down at the top of the support base (1). When the upper spiral seat (9) rotates outside the threaded column (3) at the top of the lower spiral seat (2), the upper spiral seat (9) can move up and down outside the threaded column (3).

4. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: A bevel gear is provided at the bottom of the transmission rod (17) and at the center of the lead screw (16). The transmission rod (17) and the lead screw (16) are connected by the bevel gear. When the knob A (6) drives the transmission rod (17) to rotate, the transmission rod (17) cooperates with the bevel gear to drive the lead screw (16) to rotate.

5. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: The lead screw (16) is a double-threaded lead screw. The threads at both ends of the lead screw (16) are symmetrical. When the lead screw (16) rotates, the lead screw (16) drives the two extension seats A (5) to move relative to each other. Thus, when the two extension seats A (5) extend to the outside of the top plate (4), the support area of ​​the top plate (4) can be expanded.

6. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: The extension seat A (5) is located on the top surface of the top plate (4) with a displacement groove. When the transmission assembly A, together with the knob A (6), the transmission rod (17) and the lead screw (16), drives the two extension seats A (5) to move, the two extension seats A (5) are displaced inside the displacement groove.

7. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: The two extension seats B (10) and the guide block (11) are integrated into one structure. The rack (19) on one side of the two guide blocks (11) is symmetrical about the transmission gear (18) at the center. When the knob B (13) drives the transmission gear (18) to rotate, the transmission gear (18) drives the two guide blocks (11) to move inside the guide seat (12) through the two racks (19).

8. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 1, characterized in that: One end of knob A (6) and knob B (13) is located on the top surface of the top plate (4) and the front end of the guide seat (12) are provided with a limit seat (8). One end of knob A (6) and knob B (13) passes through the limit seat (8) and is rotatably connected to the top plate (4) and the guide seat (12) respectively.

9. The butterfly-shaped double-helix top support device for post-cast strip trays in industrial buildings according to claim 8, characterized in that: Both knob A (6) and knob B (13) have limit grooves (20) on their outer sides. There are eight limit grooves (20), which are evenly distributed on the outer sides of knob A (6) and knob B (13). Limit blocks (7) are movably connected to both sides of the top surface of the limit seat (8). One end of the limit block (7) is the same shape and size as the limit groove (20). The bottom end of the limit block (7) is located inside the limit seat (8) and is fixedly connected to a connecting spring (15). When knob A (6) or knob B (13) is rotated to a suitable angle, the limit block (7) cooperates with the connecting spring (15) to be inserted into the inner side of the limit groove (20).

10. A construction method for a butterfly-shaped double-helix jacking device for post-cast strip trays in industrial buildings, characterized in that: The industrial building post-cast strip tray butterfly double helix top support device according to any one of claims 1-9 is operated as follows: Step 1: Place the device in a suitable position. Connecting seats are provided at all four ends of the bottom surface of the support base 1. One end of the connecting seat has a bolt hole. Bolts can be inserted into the inside of the bolt hole. When the support base (1) is placed in a suitable position, the support base (1) can be fixedly connected to the ground through the connecting seat. Step 2: Both the upper and lower ends of the lower spiral seat (2) are provided with threaded columns (3). When the lower spiral seat (2) rotates, the lower spiral seat (2) and the bottom threaded column (3) drive the top plate (4) to move up and down at the top of the support base (1). When the upper spiral seat (9) rotates outside the threaded column (3) at the top of the lower spiral seat (2), the upper spiral seat (9) can move up and down outside the threaded column (3), which is convenient for adjusting the height of the device according to the different heights of the post-pouring strip template. Step 3: By rotating the knob A (6) on the top surface of the top plate (4), the knob A (6) works with the transmission rod (17) and the lead screw (16) to drive the two extension seats A (5) to move relative to each other. Also, by rotating the knob B (13) on the outside of the upper screw seat (9), the knob B (13) works with the transmission gear (18) and the rack (19) to drive the two extension seats B (10) to extend on the outside of the upper screw seat (9), thereby expanding the bidirectional expansion of the device support surface in the X-axis and Y-axis directions, forming a "butterfly" support profile, significantly improving the load-bearing area and anti-overturning ability. Step 4: Limiting seats (8) are provided on the outer side of both knob A (6) and knob B (13). One end of knob A (6) and knob B (13) passes through the limiting seat (8) and is rotatably connected to the top plate (4) and guide seat (12) respectively. When knob A (6) or knob B (13) is rotated to a suitable angle, the limiting blocks (7) on both sides of the top surface of the limiting seat (8) cooperate with the connecting spring (15) to be inserted into the limiting groove (20) on the outer wall of knob A (6) or knob B (13), thereby facilitating the locking of knob A (6) or knob B (13) and improving the stability of the device.

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