Lifting device for large-span steel grid construction

Abstract

The invention discloses a lifting device for large-span steel truss construction, and particularly relates to the field of steel truss construction.The lifting device comprises a structural column, a lifting frame is installed at the top of the structural column, lifting equipment is installed on the two sides of the lifting frame and used for lifting a ring beam, and the upper end of the structural column is used for installing a flat beam; the flat beam is fixedly connected with the ring beam at a designed elevation; the lifting device for large-span steel truss construction further comprises a fixing frame which is used for being fixed to the end of the ring beam. Through the arrangement of the base, the positioning body and the rotating seat, in the process of lifting the steel truss, swing of the steel truss can be adapted, in the gradual lifting process, the positioning body gradually extrudes the positioning column, overall positioning of the positioning column, the ring beam and the steel truss is completed, after the ring beam is lifted to the designed elevation, the ring beam can be aligned with the end of a flat beam, and the positioning accuracy of the ring beam is improved. Therefore, the ring beam and the flat beam can be welded and fixed conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of steel grid construction, and more specifically, the present invention relates to a lifting device for large-span steel grid construction. Background Art

[0002] The steel grid is a steel structure grid, which has a large covering span. Most components of the steel grid structure can be prefabricated, with excellent economy and rapid development, so it is widely used in large-span space structures.

[0003] There are various lifting methods for steel grids, such as the overall jacking method, the overall lifting method, the overall hoisting method, etc. Among them, the overall lifting method includes the single-lifting grid method, the grid climbing method, and the beam-lifting and grid-lifting method. When using the beam-lifting and grid-lifting method in construction, first, a formwork support is erected, and the grid is assembled in place at the formwork support position. At the same time, the prefabricated ring beam for supporting the grid is installed. Before lifting, the ring beam is disconnected from the beam-column. After the grid is lifted, it is then connected to the beam-column as a whole. The grid support is installed in the middle of this beam, and hydraulic lifting equipment is installed on top of each structural column. These hydraulic lifting equipment lift the grid to the design elevation while lifting the beam.

[0004] After the steel grid is lifted in place, it is necessary to weld the ring beam and the flat beam together. It needs to be lifted to a relatively high position. Affected by the wind, it will shake during the lifting process. Moreover, after lifting, due to reasons such as the installation error of the hydraulic lifting equipment, there will be a problem of misalignment between the ring beam and the flat beam in the horizontal direction, resulting in great welding difficulty. When the misalignment is serious, there will be a problem of inability to weld. Summary of the Invention

[0005] A lifting device for large-span steel grid construction provided by the present invention aims to solve the problem that after the steel grid is lifted in place, the ring beam and the flat beam are misaligned in the horizontal direction, resulting in great welding difficulty. When the misalignment is serious, there will be a problem of inability to weld.

[0006] To achieve the above object, the present invention provides the following technical solution: A lifting device for large-span steel grid construction includes a structural column and a lifting frame installed at the top of the structural column. Lifting equipment for lifting the ring beam is installed on both sides of the lifting frame. The upper end of the structural column is used to install the flat beam, and the flat beam is used to be connected and fixed to the ring beam at the design elevation. The lifting device for large-span steel grid construction further includes a fixing frame for fixing at the end of the ring beam. A positioning column is fixedly connected to the bottom of the fixing frame, and a supporting member is installed at the bottom of the positioning column. A positioning mechanism is provided at the bottom of the fixing frame. The positioning mechanism includes a base. An activity area is provided in the middle of the base. The positioning column is inserted downward into the interior of the activity area. The supporting member is used to support the bottom of the base. A plurality of positioning bodies are arranged in the circumferential direction at the inner bottom of the base. A rotating seat is installed at the upper side position inside the base, and the rotating seat presses the positioning bodies against the outer wall of the positioning column.

[0007] In a preferred embodiment, a plurality of grooves one facing the positioning posts are formed in the circumferential direction at the bottom inside the base, and a plurality of positioning bodies are respectively arranged inside the plurality of grooves one. The rotating seat is threadedly connected to the base, and the bottom of the rotating seat has a conical surface, and the conical surface presses against the end position of the positioning body on the side away from the positioning post; the positioning mechanism further includes a transmission assembly for driving the rotating seat to rotate, so that the rotating seat squeezes the positioning body towards the middle of the base, causing the positioning body to press against the outer wall of the positioning post.

[0008] In a preferred embodiment, at least two guiding posts are fixedly installed on one side of the structural column, and a connecting arm is fixedly connected to the bottom of the base. The connecting arm is sleeved on the guiding posts, so that the base can move along the axial direction of the guiding posts.

[0009] In a preferred embodiment, the supporting member includes a limiting sleeve fixedly installed at the bottom of the positioning post, and a plurality of limiting rods are fixedly connected in the circumferential direction of the limiting sleeve. The plurality of limiting rods are in contact with the bottom of the base.

[0010] In a preferred embodiment, the transmission assembly includes a bracket fixedly connected to the outside of the base. A rotating shaft is rotatably connected to the bracket, and a gear is installed on the rotating shaft. A rack is fixedly installed on one of the guiding posts, and the gear can be meshed with the rack. The rotating shaft is in transmission connection with the rotating seat.

[0011] In a preferred embodiment, the transmission assembly further includes a first transmission wheel fixedly installed at one end of the rotating shaft away from the gear. A plurality of first transmission pins are fixedly connected in the circumferential direction of the first transmission wheel. A second transmission wheel is fixedly sleeved on the upper end of the rotating seat. A plurality of second transmission pins are fixedly connected in the circumferential direction of the second transmission wheel. The second transmission pins are meshed with the first transmission pins.

[0012] In a preferred embodiment, the positioning mechanism further includes a disengaging assembly. The disengaging assembly includes a disengaging plate sleeved on the rotating shaft. A first spring is fixedly connected between the disengaging plate and the bracket. A guiding rod is fixedly connected to the bracket. The guiding rod is movably inserted into the disengaging plate. The guiding rod is parallel to the axis of the rotating shaft. The gear is axially slidably installed on the rotating shaft and is rotatably connected to the disengaging plate.

[0013] In a preferred embodiment, the disengaging assembly further includes a disengaging rod, a fixing rod and a second spring. A groove two is formed at the bottom of one of the grooves one close to the disengaging plate. The disengaging rod is arranged inside the groove two. The fixing rod is fixed to the bottom of the bracket. The fixing rod is vertically movably inserted into the disengaging rod. A second spring is sleeved on the bottom of the fixing rod. The second spring is used to reset the disengaging rod upwards. A disengaging hole is formed on one side of the bottom of the disengaging plate. The end of the disengaging rod presses against the side wall of the disengaging plate. When the disengaging rod is aligned with the disengaging hole, the first spring pulls the disengaging plate and the gear to move, causing the gear to disengage from the rack.

[0014] In a preferred embodiment, a relaxation rod corresponding to each positioning body is inserted in the circumferential direction of the rotating seat. The relaxation rod is threadedly connected to the rotating seat. The bottom of the relaxation rod is flush with the conical surface, and the relaxation rod presses on the end of the positioning body away from the positioning column.

[0015] In a preferred embodiment, the positioning body includes a cylinder and hemispheres located at both ends of the cylinder. When one end of the positioning body close to the limiting rod presses on the outer side wall of the positioning column, the relaxation rod presses on the end of the positioning body away from the positioning column.

[0016] In a preferred embodiment, the fixed frame includes an inner frame and an outer frame. Both the inner frame and the outer frame are sleeved on the outer side of the ring beam, and the ends of the inner frame and the outer frame are connected and fixed to each other.

[0017] Technical effects and advantages of the present invention: By providing a base, a positioning body and a rotating seat, the present invention can adapt to the swing of the steel grid frame during the lifting process. And during the gradual lifting process, the positioning body gradually presses on the positioning column to complete the overall positioning of the positioning column, the ring beam and the steel grid frame, so that after the ring beam is lifted to the designed elevation, it can be aligned with the end of the flat beam to prevent the problem of dislocation, which is beneficial to the welding and fixing of the ring beam and the flat beam.

[0018] By providing a disengaging assembly, when the positioning body presses the positioning column tightly, the disengaging rod releases the restriction on the disengaging plate, so that the first spring can pull the gear away from the rack, making the gear and the rack no longer engaged, preventing the occurrence of jamming caused by their continuous engagement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the partial structure of the present invention Figure 1 .

[0021] Figure 3 It is a schematic diagram of the partial structure of the present invention Figure 2 .

[0022] Figure 4 It is a schematic diagram of the structure of the positioning mechanism of the present invention.

[0023] Figure 5 It is a cross-sectional view of the positioning mechanism of the present invention.

[0024] Figure 6 It is a schematic diagram of the partial structure of the positioning mechanism of the present invention.

[0025] Figure 7 It is a schematic diagram of the installation of the fixed frame and the positioning column of the present invention.

[0026] Figure 8 This is a schematic diagram during the lifting of the long-span steel grid frame of the present invention.

[0027] The reference numerals are: 1, structural column; 2, lifting frame; 3, lifting equipment; 31, steel strand; 4, fixed frame; 41, inner frame; 42, outer frame; 5, positioning column; 50, supporting member; 51, limiting sleeve; 52, limiting rod; 7, guiding column; 71, rack; 6, positioning mechanism; 60, connecting arm; 61, base; 611, movable area; 612, groove one; 613, groove two; 62, positioning body; 63, rotating seat; 64, conical surface; 65, transmission component; 651, bracket; 652, rotating shaft; 653, gear; 654, transmission wheel one; 6541, transmission pin one; 655, transmission wheel two; 6551, transmission pin two; 66, disengaging component; 661, disengaging plate; 6611, disengaging hole; 662, spring one; 663, guiding rod; 664, disengaging rod; 665, fixing rod; 666, spring two; 67, releasing rod; 100, ring beam; 200, flat beam. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Referring to the attached drawings of the specification Figures 1-8 , a lifting device for long-span steel grid frame construction includes a structural column 1 and a lifting frame 2 installed at the top of the structural column 1. Lifting equipment 3 for lifting the ring beam 100 is installed on both sides of the lifting frame 2. The upper end of the structural column 1 is used for installing a flat beam 200, and the flat beam 200 is used for connecting and fixing with the ring beam 100 at the design elevation.

[0030] In this embodiment, the lifting device for long-span steel grid frame construction further includes a fixed frame 4 for fixing at the end of the ring beam 100. A positioning column 5 is fixedly connected to the bottom of the fixed frame 4, and a supporting member 50 is installed at the bottom of the positioning column 5. A positioning mechanism 6 is arranged at the bottom of the fixed frame 4. The positioning mechanism 6 includes a base 61. An activity area 611 is arranged in the middle of the base 61. The positioning column 5 is inserted downward into the inside of the activity area 611. The supporting member 50 is used for supporting the bottom of the base 61. A plurality of positioning bodies 62 are arranged in the circumferential direction at the inner bottom of the base 61. A rotating seat 63 is installed at the upper side position inside the base 61, and the rotating seat 63 presses the positioning bodies 62 against the outer wall of the positioning column 5.

[0031] In the above technical solution, as Figure 5As shown, a plurality of first grooves 612 are formed in the circumferential direction at the inner bottom of the base 61 and face the positioning posts 5. A plurality of positioning bodies 62 are respectively arranged inside the plurality of first grooves 612. The rotating seat 63 is threadedly connected to the base 61. The bottom of the rotating seat 63 has a conical surface 64, and the conical surface 64 presses against the end position of the positioning body 62 on the side away from the positioning post 5. The positioning mechanism 6 further includes a transmission assembly 65. The transmission assembly 65 is used to drive the rotating seat 63 to rotate, so that the rotating seat 63 presses the positioning body 62 toward the middle of the base 61, and the positioning body 62 presses against the outer wall of the positioning post 5.

[0032] In the above technical solution, as Figures 2-3 shown, the supporting member 50 includes a limiting sleeve 51 fixedly installed at the bottom of the positioning post 5. A plurality of limiting rods 52 are fixedly connected in the circumferential direction of the limiting sleeve 51, and the plurality of limiting rods 52 are in contact with the bottom of the base 61.

[0033] It should be noted that when the lifting device 3 lifts the ring beam 100, the fixed frame 4 and the positioning post 5 also move upward together. The positioning post 5 drives the positioning mechanism 6 to move upward through the limiting sleeve 51 and the limiting rods 52.

[0034] In the above technical solution, as Figures 1-3 shown, at least two guiding posts 7 are fixedly installed on one side of the structural column 1. A connecting arm 60 is fixedly connected to the bottom of the base 61, and the connecting arm 60 is sleeved on the guiding posts 7, so that the base 61 can move along the axial direction of the guiding posts 7.

[0035] It should be noted that when the lifting device 3 lifts the ring beam 100, the positioning mechanism 6 moves upward synchronously. Figure 2 and Figure 3 In, two guiding posts 7 are provided, and the connecting arm 60 is sleeved on the two guiding posts 7. The positioning mechanism 6 is guided by the two guiding posts 7 to prevent the positioning mechanism 6 from shifting.

[0036] In the above technical solution, as Figure 4 and Figure 5 shown, the transmission assembly 65 includes a bracket 651 fixedly connected to the outside of the base 61. A rotating shaft 652 is rotatably connected to the bracket 651. A gear 653 is installed on the rotating shaft 652. A rack 71 is fixedly installed on one of the guiding posts 7, and the gear 653 can be meshed with the rack 71. The rotating shaft 652 is in transmission connection with the rotating seat 63.

[0037] Further, the transmission assembly 65 further includes a first transmission wheel 654 fixedly installed at one end of the rotating shaft 652 away from the gear 653. A plurality of first transmission pins 6541 are fixedly connected in the circumferential direction of the first transmission wheel 654. A second transmission wheel 655 is fixedly sleeved on the upper end of the rotating seat 63. A plurality of second transmission pins 6551 are fixedly connected in the circumferential direction of the second transmission wheel 655. The second transmission pins 6551 are engaged with the first transmission pins 6541.

[0038] It should be noted that when the lifting device 3 lifts the ring beam 100, the positioning mechanism 6 moves upward synchronously, and the gear 653 meshes with the rack 71. Thus, during the lifting process, the gear 653 drives the rotating shaft 652 to rotate. The rotating shaft 652 drives the rotating seat 63 to rotate through the first transmission wheel 654, the first transmission pins 6541, the second transmission wheel 655, and the second transmission pins 6551. The rotating seat 63 and the base 61 are connected by internal and external threads. While the rotating seat 63 rotates, it moves downward, and the conical surface 64 presses the end of the positioning body 62, so that the positioning body 62 gradually approaches the positioning column 5 and finally presses on the positioning column 5.

[0039] In the above technical solution, as Figure 7 shown, the fixed frame 4 includes an inner frame 41 and an outer frame 42. Both the inner frame 41 and the outer frame 42 are sleeved on the outside of the ring beam 100, and the ends of the inner frame 41 and the outer frame 42 are fixedly connected to each other.

[0040] In the above technical solution, the lifting device 3 is a through-type hydraulic jack, and the through-type hydraulic jack has a steel strand 31.

[0041] In this embodiment, the implementation manner is specifically: as Figure 8As shown, there are several structural columns 1 surrounding in a circle. A formwork support is arranged inside, and then the large-span steel grid is assembled in place at the position of the formwork support. During the assembly, the supports of the steel grid are installed in the middle of the ring beam 100, that is, the ring beam 100 is used as the support structure during the lifting of the steel grid. In this way, the ring beam 100 can be lifted. During the lifting, the steel strand 31 is fixed to the end of the ring beam 100, and then lifted by the lifting device 3. During the lifting process, the ring beam 100 is lifted upward. The ring beam 100 drives the positioning mechanism 6 to lift upward through the limit sleeve 51 and the limit rod 52. The guide post 7 guides the positioning mechanism 6 to prevent the positioning mechanism 6 from shifting. During the lifting process, the gear 653 meshes with the rack 71, so that the transmission assembly 65 can drive the rotating seat 63 to rotate. The rotating seat 63 rotates relative to the base 61 and moves downward. The rotating seat 63 presses the positioning body 62 downward through the conical surface 64, so that the positioning body 62 slowly moves toward the direction of the positioning column 5 and finally presses on the outer wall of the positioning column 5, thus completing the final positioning of the positioning column 5. Positioning the positioning column 5 is also positioning the ring beam 100. The purpose is to make the ring beam 100 align with the end of the flat beam 200 after being lifted to the designed elevation, which is beneficial to the welding and fixing of the ring beam 100 and the flat beam 200.

[0042] It should be noted that during the lifting, due to the large error in the in-place assembly position of the steel grid, that is, after connecting the steel strand 31 to the end of the ring beam 100, the axis of the steel strand 31 is not perpendicular to the upper surface of the ring beam 100, there is a small angular error. Therefore, during the hoisting, there will be a certain swing. Therefore, an activity area 611 is designed. The diameter of the activity area 611 is larger than the diameter of the positioning column 5, so that when the steel grid swings, the positioning column 5 can freely swing inside the activity area 611 without affecting the structure of the positioning mechanism 6. During the lifting process, the rotating seat 63 gradually presses the positioning body 62, so that the positioning body 62 gradually presses the positioning column 5 tightly, so that the steel grid no longer swings and the positioning is completed. This structural setting can complete the positioning of the steel grid during the swinging process of the steel grid.

[0043] Through the above technical solution, by setting the base 61, the positioning body 62 and the rotating seat 63, during the process of lifting the steel grid, it can adapt to the swing of the steel grid, and during the gradual lifting process, the positioning body 62 gradually presses the positioning column 5 to complete the overall positioning of the positioning column 5, the ring beam 100 and the steel grid, so that the ring beam 100 can align with the end of the flat beam 200 after being lifted to the designed elevation, preventing the problem of dislocation, which is beneficial to the welding and fixing of the ring beam 100 and the flat beam 200.

[0044] Refer to the attached drawings of the specification Figures 1-6, when the gear 653 meshes with the rack 71, it can drive the rotating seat 63 to press down the positioning body 62. After the positioning body 62 presses against the positioning column 5, the gear 653 can no longer rotate. Therefore, it is necessary for the gear 653 to disengage from the rack 71, otherwise it will be stuck. However, it is difficult to master the installation height of the rack 71, that is, it is difficult to grasp the timing of the disengagement between the gear 653 and the rack 71. Therefore, the following technical solution is further proposed.

[0045] Specifically, as Figures 4-6 shown, the positioning mechanism 6 further includes a disengaging assembly 66. The disengaging assembly 66 includes a disengaging plate 661. The disengaging plate 661 is sleeved on the rotating shaft 652. A first spring 662 is fixedly connected between the disengaging plate 661 and the bracket 651. A guide rod 663 is fixedly connected to the bracket 651. The guide rod 663 is movably inserted into the disengaging plate 661. The guide rod 663 is parallel to the axis of the rotating shaft 652. The gear 653 is axially slidably mounted on the rotating shaft 652, and the gear 653 is rotatably connected to the disengaging plate 661.

[0046] Furthermore, the disengaging assembly 66 further includes a disengaging rod 664, a fixing rod 665 and a second spring 666. A second groove 613 is formed at the bottom of a first groove 612 close to the disengaging plate 661. The disengaging rod 664 is disposed inside the second groove 613. The fixing rod 665 is fixed to the bottom of the bracket 651. The fixing rod 665 is vertically movably inserted into the disengaging rod 664. A second spring 666 is sleeved on the bottom of the fixing rod 665. The second spring 666 is used to reset the disengaging rod 664 upward. A disengaging hole 6611 is formed on one side of the bottom of the disengaging plate 661. The end of the disengaging rod 664 presses against the side wall of the disengaging plate 661. When the disengaging rod 664 is aligned with the disengaging hole 6611, the first spring 662 pulls the disengaging plate 661 and the gear 653 to move, so that the gear 653 disengages from the rack 71.

[0047] In this embodiment, the implementation method is specifically as follows: During the initial lifting process, the gear 653 meshes with the rack 71, so that the positioning body 62 gradually approaches the positioning column 5 and finally presses on the positioning column 5. As Figure 5 shown, the left positioning body 62 presses on the disengaging rod 664. During the process of the positioning body 62 moving towards the middle and pressing on the positioning column 5, the disengaging rod 664 will slowly move upward along the rear end of the positioning body 62. After the positioning body 62 presses on the positioning column 5, the end of the disengaging rod 664 is aligned with the disengaging hole 6611. At this time, under the action of the pulling force of the first spring 662, the disengaging plate 661 and the gear 653 move to the right at the same time, that is, the gear 653 disengages from the rack 71. The base 61 is threadedly connected to the rotating seat 63, and their positions remain relatively stationary, so that the positioning body 62 can always press on the positioning column 5.

[0048] Through the above technical solution, by providing a disengaging component 66, when the positioning body 62 presses the positioning post 5, the disengaging rod 664 releases the restriction on the disengaging plate 661, enabling the first spring 662 to pull the gear 653 away from the rack 71, so that the gear 653 and the rack 71 are no longer engaged, preventing the jamming situation caused by their continuous engagement.

[0049] Refer to the attached Figures 1-6 of the specification. A release rod 67 corresponding to the positioning body 62 one by one is inserted in the circumferential direction of the rotating seat 63. The release rod 67 is threadedly connected to the rotating seat 63. The bottom of the release rod 67 is flush with the conical surface 64, and the release rod 67 presses on the end of the positioning body 62 away from the positioning post 5.

[0050] Furthermore, the positioning body 62 includes a cylinder and hemispheres at both ends of the cylinder. When one end of the positioning body 62 close to the limiting rod 52 presses on the outer side wall of the positioning post 5, the release rod 67 presses on the end of the positioning body 62 away from the positioning post 5.

[0051] It should be noted that after the ring beam 100 is lifted to the designed elevation and welded, it is necessary to release the extrusion of the positioning body 62 on the positioning post 5. During the operation, rotate the release rod 67 upward to disengage the bottom of the release rod 67 from the end of the positioning body 62, thereby creating a gap for the positioning body 62 to move, and further enabling the positioning body 62 to no longer press on the positioning post 5. After removing the limiting sleeve 51 from the positioning post 5, it is convenient for the positioning post 5 to disengage from the positioning mechanism 6.

[0052] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lifting device for the construction of a large-span steel grid structure, characterized in that: It includes a structural column (1) and a lifting frame (2) installed at the top of the structural column (1). Lifting devices (3) for lifting the ring beam (100) are installed on both sides of the lifting frame (2). The lifting device for large-span steel grid construction further includes a fixing frame (4) for fixing at the end of the ring beam (100). A positioning column (5) is fixedly connected to the bottom of the fixing frame (4), and a supporting member (50) is installed at the bottom of the positioning column (5). A positioning mechanism (6) is arranged at the bottom of the fixing frame (4). The positioning mechanism (6) includes a base (61). An activity area (611) is arranged in the middle of the base (61). The positioning column (5) is inserted downward into the interior of the activity area (611). The supporting member (50) is used to support the bottom of the base (61). A plurality of positioning bodies (62) are arranged in the circumferential direction at the inner bottom of the base (61). A rotating seat (63) is installed at the upper side position inside the base (61). The rotating seat (63) presses the positioning bodies (62) against the outer wall of the positioning column (5).

2. The lifting device for large-span steel grid construction according to claim 1, wherein: A plurality of grooves one (612) facing the positioning column (5) are formed in the circumferential direction at the inner bottom of the base (61). A plurality of positioning bodies (62) are respectively arranged in a plurality of grooves one (612). The rotating seat (63) is threadedly connected to the base (61). The bottom of the rotating seat (63) has a conical surface (64). The conical surface (64) presses against the end position on the side of the positioning body (62) away from the positioning column (5). The positioning mechanism (6) further includes a transmission component (65). The transmission component (65) is used to drive the rotating seat (63) to rotate, so that the rotating seat (63) squeezes the positioning bodies (62) towards the middle of the base (61), and the positioning bodies (62) are pressed against the outer wall of the positioning column (5).

3. The lifting device for the construction of a long-span steel grid frame according to claim 2, characterized in that: At least two guide columns (7) are fixedly installed on one side of the structural column (1). A connecting arm (60) is fixedly connected to the bottom of the base (61). The connecting arm (60) is sleeved on the guide column (7), so that the base (61) can move along the axial direction of the guide column (7).

4. A lifting device for large-span steel grid construction according to claim 1, characterized in that: The supporting member (50) includes a limiting sleeve (51) fixedly installed at the bottom of the positioning column (5). A plurality of limiting rods (52) are fixedly connected in the circumferential direction of the limiting sleeve (51). A plurality of the limiting rods (52) are in contact with the bottom of the base (61).

5. The lifting device for large-span steel grid construction according to claim 3, characterized in that: The transmission component (65) includes a bracket (651) fixedly connected to the outside of the base (61). A rotating shaft (652) is rotatably connected to the bracket (651). A gear (653) is installed on the rotating shaft (652). A rack (71) is fixedly installed on one of the guide columns (7). The gear (653) can be meshed with the rack (71). The rotating shaft (652) is in transmission connection with the rotating seat (63).

6. The lifting device for large-span steel grid construction according to claim 5, characterized in that: The transmission assembly (65) further includes a first transmission wheel (654) fixedly installed at one end of the rotating shaft (652) away from the gear (653). A plurality of first transmission pins (6541) are fixedly connected in the circumferential direction of the first transmission wheel (654). A second transmission wheel (655) is fixedly sleeved on the upper end of the rotating seat (63). A plurality of second transmission pins (6551) are fixedly connected in the circumferential direction of the second transmission wheel (655). The second transmission pins (6551) are engaged with the first transmission pins (6541).

7. The lifting device for the construction of a long-span steel grid frame according to claim 6, characterized in that: The positioning mechanism (6) further includes a disengaging assembly (66). The disengaging assembly (66) includes a disengaging plate (661). The disengaging plate (661) is sleeved on the rotating shaft (652). A first spring (662) is fixedly connected between the disengaging plate (661) and the bracket (651). A guide rod (663) is fixedly connected to the bracket (651). The guide rod (663) is movably inserted into the disengaging plate (661). The guide rod (663) is parallel to the axis of the rotating shaft (652). The gear (653) is axially slidably installed on the rotating shaft (652), and the gear (653) is rotatably connected to the disengaging plate (661).

8. The lifting device for large-span steel grid construction according to claim 7, wherein: The disengaging assembly (66) further includes a disengaging rod (664), a fixing rod (665) and a second spring (666). A second groove (613) is formed at the bottom of a first groove (612) close to the disengaging plate (661). The disengaging rod (664) is arranged inside the second groove (613). The fixing rod (665) is fixed to the bottom of the bracket (651). The fixing rod (665) is vertically movably inserted into the disengaging rod (664). A second spring (666) is sleeved on the bottom of the fixing rod (665). The second spring (666) is used to reset the disengaging rod (664) upward. A disengaging hole (6611) is formed on one side of the bottom of the disengaging plate (661). The end of the disengaging rod (664) presses against the side wall of the disengaging plate (661). When the disengaging rod (664) is aligned with the disengaging hole (6611), the first spring (662) pulls the disengaging plate (661) and the gear (653) to move, so that the gear (653) disengages from the rack (71).

9. The lifting device for large-span steel grid construction according to claim 1, characterized in that: Relaxing rods (67) corresponding to the positioning bodies (62) one by one are inserted in the circumferential direction of the rotating seat (63). The relaxing rods (67) are threadedly connected to the rotating seat (63). The bottom of the relaxing rod (67) is flush with the conical surface (64). The relaxing rod (67) presses against the end of the positioning body (62) away from the positioning column (5).

10. A lifting device for large-span steel grid construction according to claim 9, characterized in that: The positioning body (62) includes a cylinder and hemispheres at both ends of the cylinder. When one end of the positioning body (62) close to the limiting rod (52) presses against the outer side wall of the positioning column (5), the relaxing rod (67) presses against the end of the positioning body (62) away from the positioning column (5).

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