A large-span sports stadium roof grid lifting mechanism and construction method

Abstract

The invention relates to a lifting mechanism and a construction method for a roof grid of a large-span sports stadium, and belongs to the technical field of building construction. Two groups of extension rods are arranged in the steel roof grid, and a limiting sleeve is fixedly installed on each group of extension rods; two lifters are penetrated through the top of the lifting frame on the top of the column, and a clamping mechanism is arranged at the bottom end of the first steel cable, which extends to the ground and is clamped with the limiting sleeve; a hemispherical support is arranged on the top of the column, and the lifting frame comprises a positioning column sleeved on the column below the hemispherical support, a fixing rod is detachably arranged on the outer wall corbel of the positioning column, the tops of multiple fixing rods are fixedly provided with the same top frame, the top of the top frame is fixedly provided with a mounting seat, and the lifter is penetrated and fixedly arranged on the top of the mounting seat; an anti-falling mechanism is arranged on two corbels on the same side; a releasing mechanism is arranged on the top frame; the problems existing in the lifting process of the steel structure roof grid, such as inconvenient disassembly and assembly of the hoist, poor lifting firmness and no secondary protection, which affect the construction progress and construction effect, are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and relates to a large-span sports stadium roof grid lifting mechanism and a construction method. Background Art

[0002] Large-span steel structures are increasingly used in real life, such as large gymnasiums, theaters, etc. As a type of large-span steel structure, roof grid structures are also increasingly used in large projects such as stations and ports. At present, there are two main construction and installation methods commonly used for large-span steel structures: one is to assemble directly at the high-altitude design installation position or to slide to the design position after assembling at high altitude, such as high-altitude bulk method, high-altitude sliding method, etc.; the other is to assemble on the ground first and then install it step by step to the design position, such as segmented hoisting method.

[0003] The traditional lifting method of the existing large-span stadium steel structure roof grid is usually to directly weld the lifting bracket at the top of the column, install the lifting equipment, and then lift the steel structure roof grid through the lifting equipment after the ground steel structure roof grid is assembled. However, the existing steel structure roof grid lifting mechanism still has the following disadvantages during use: 1. After the steel structure roof grid is hoisted, it is necessary to manually remove the hoist from the lower chord, which is very dangerous due to the high installation height; 2. The steel structure roof grid is not firmly connected during the lifting process, and there is a risk of falling. Summary of the invention

[0004] In view of this, the present invention provides a large-span sports stadium roof grid lifting mechanism and construction method in order to solve the problems that the lifting equipment is inconvenient to disassemble and assemble, the lifting firmness is poor and there is no secondary protection, which affects the construction progress and construction effect during the lifting process of the above-mentioned steel structure roof grid.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A large-span sports stadium roof grid lifting mechanism, comprising a plurality of steel roof grids spliced ​​in sequence and a plurality of columns located in the steel roof grids, wherein two groups of extension rods are arranged in the steel roof grids, and a limited position sleeve is fixedly installed on each group of extension rods;

[0007] A lifting frame is provided on the top of the column, and two lifters are provided through the top of the lifting frame. A first steel cable is provided on the lifter, and a clamping mechanism is provided at the bottom end of the first steel cable. The clamping mechanism extends to the ground and is clamped with the limit sleeve;

[0008] A hemispherical support is provided on the top of the column, and the lifting frame includes a positioning column sleeved on the upper part of the column, the positioning column is located below the hemispherical support, a plurality of brackets are fixedly provided on the outer wall of the positioning column, a fixing rod is detachably provided on the bracket, a same top frame is fixedly provided on the top of the plurality of fixing rods, a mounting seat is fixedly provided on the top of the top frame, and a lifter is fixedly provided on the top of the mounting seat through the lifting device;

[0009] The anti-fall mechanism is arranged on the two brackets on the same side and is used to protect the steel roof grid after the limit sleeve and the clamping mechanism are released;

[0010] The release mechanism is arranged on the top frame and is used in conjunction with the clamping mechanism. After being lifted and fixed in place, it automatically releases the fixation of the limit sleeve and provides opening power for the anti-fall mechanism.

[0011] Furthermore, the clamping mechanism includes an anchor fixedly sleeved at the bottom end of the first steel cable, a plurality of rectangular openings are provided on the top of the anchor, a guide rod is fixedly provided on the inner wall of one side of the rectangular opening, a sliding block is slidably provided in the rectangular opening, a guide hole is provided on one side of the sliding block, the guide rod is slidably arranged in the guide hole, a first spring is sleeved on the outer wall of the guide rod, two ends of the first spring are respectively fixedly connected to one side of the sliding block and the inner wall of one side of the rectangular opening, a yield groove for accommodating the first spring is provided on the side of the sliding block close to the first steel cable, a slope for transition is provided on the top of the side of the sliding block away from the first steel cable, and a bearing platform that contacts the bottom of the limit sleeve is provided on the bottom of the sliding block away from the first steel cable.

[0012] Furthermore, a mounting hole is provided at the bottom of the corbel, a connecting seat is detachably provided in the mounting hole, a guide column is slidably provided through the connecting seat, and the guide column is inserted into the fixing rod for limiting the fixing rod.

[0013] Furthermore, the connecting seat includes a rotating cylinder, an outer screw barrel is rotatably provided at the bottom of the rotating cylinder, the thread of the outer screw barrel is arranged in the mounting hole, the outer walls of the two outer screw barrels on the same side are rotatably sleeved with the same connecting plate, a plurality of handles are fixedly provided at the bottom of the outer screw barrel, and an anti-fall mechanism is arranged on the connecting plate.

[0014] Furthermore, the anti-fall mechanism includes a fixed seat fixed on the top of the connecting plate, and two anti-fall rods used in conjunction with the steel roof grid are slidably provided on one side of the fixed seat. A sliding rod is slidably provided through the top of the connecting plate, and a second rotating shaft is fixedly provided on the outer wall of the sliding rod. The same first rotating shaft is fixedly provided between the two anti-fall rods, and two connecting rods are rotatably sleeved on the outer walls of the second rotating shaft and the first rotating shaft, and the sliding rod is connected to the release mechanism.

[0015] Furthermore, the releasing mechanism includes a hydraulic cylinder passing through the top of the mounting seat, a lifting plate is fixedly provided at the output end of the hydraulic cylinder, the lifting plate is sleeved on two first steel cables, a sleeve rod used in conjunction with a plurality of sliding blocks is sleeved on the first steel cables, the sleeve rod is fixed at the bottom of the lifting plate, and after being lifted into place, the hydraulic cylinder is started to drive the sleeve rod to move downward, and the sliding block is moved inward by squeezing the inclined surface of the sliding block, thereby releasing the interference between the sliding block and the limit sleeve.

[0016] Furthermore, two second steel cables are fixedly provided at the bottom of the lifting plate, and the bottom ends of the two second steel cables are fixedly connected to the corresponding sliding rods, and a connecting strip is fixedly provided at the bottom end of the sliding rod. A second spring is sleeved on the outer wall of the sliding rod, and the two ends of the second spring are respectively fixedly connected to the connecting strip and the side of the connecting plate close to each other. When the lifting plate moves downward, the sliding rod can reset and move under the action of the second spring, and drive the anti-fall rod to extend to the bottom of the steel roof grid frame through the connecting rod to protect the steel roof grid frame.

[0017] Furthermore, a fixed block is rotatably provided at the bottom of the guide column, and two fixed blocks on the same side are fixedly connected to the corresponding connecting strips, which can drive the guide column to be inserted into the fixed rod when the hydraulic cylinder is started to retract, thereby limiting the fixed rod.

[0018] Furthermore, a spiral groove is provided on the outer wall of the guide column, a plurality of second sliding columns located in the spiral groove are fixedly provided on the inner wall of the rotating cylinder, and a plurality of first sliding columns located in the spiral groove are fixedly provided on the inner wall of the fixed rod. When the guide column is raised or lowered, the second sliding columns and the spiral groove are used to drive the guide column to rotate, so that the first sliding columns are screwed into the spiral groove to further fix the fixed rod.

[0019] A construction method for a large-span sports stadium roof grid lifting mechanism comprises the following steps:

[0020] S1. First, use a crane to hoist the lifting frame onto the column, and start the hydraulic cylinder to retract and fix the fixing rod onto the bull leg;

[0021] S2, then, start the hoist to lower the first steel cable, fix the limit sleeve through the anchor, and then lift the steel roof grid;

[0022] S3. After the hoisting is completed, the steel roof grid is connected to the hemispherical support through the connecting piece, and the hydraulic cylinder is started to extend to release the fixation of the fixing rod, and the anti-fall rod is driven to extend to protect the extension rod;

[0023] S4. Finally, remove the connecting seat from the bull leg and use a crane to remove the lifting frame from the column.

[0024] The beneficial effects of the present invention are:

[0025] 1. The invention discloses a large-span sports stadium roof grid lifting mechanism, which drives the guide column to move upward through a hydraulic cylinder, and cooperates with a unique spiral groove and sliding column design to achieve a stable fixation of the fixed rod, thereby ensuring the stability and safety of the lifting frame during the lifting process. The invention is convenient for assembly and disassembly, which can improve work efficiency. In the process of releasing the fixation of the fixed rod, the anti-fall rod can also be driven to extend, which can effectively prevent the steel roof from falling due to loose connection, thereby improving the safety of the installation process, and solving the problem that the lifting firmness of the steel structure roof grid is poor and there is no secondary protection during the lifting process, thereby affecting the construction progress and construction effect.

[0026] 2. The present invention discloses a large-span sports stadium roof grid lifting mechanism, which can limit the limit sleeve by arranging multiple sliding blocks on the anchor, and can also cooperate with the hydraulic cylinder to automatically release the limit of the anchor on the limit sleeve after installation, so that disassembly is convenient and there is no need to manually release the connection between the first steel cable and the limit sleeve.

[0027] 3. The present invention discloses a large-span sports stadium roof grid lifting mechanism, which has a reasonably designed disassembly mechanism, such as the rapid separation of the connecting seat and the corbel, and the lifting and disassembly of the lifting frame, so that the entire device is easy to disassemble and reuse, thereby improving the utilization rate of the equipment and solving the problem of inconvenient disassembly and assembly of the hoisting equipment in the current steel structure roof grid lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 It is a three-dimensional structural schematic diagram of a large-span sports stadium roof grid lifting mechanism of the present invention;

[0030] Figure 2 This is a schematic diagram of the installation structure of the hanger and the limit sleeve in a large-span sports stadium roof grid lifting mechanism of the present invention;

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of a hanger in a large-span sports stadium roof grid lifting mechanism of the present invention;

[0032] Figure 4 This is a schematic diagram of the installation structure of a lifting frame and columns in a large-span sports stadium roof grid lifting mechanism of the present invention;

[0033] Figure 5 This is a schematic diagram of the installation structure of the anti-falling rod in the grid lifting mechanism of a large-span sports stadium roof according to the present invention;

[0034] Figure 6This is a schematic diagram of the installation structure of the first sliding column and the second sliding column in a large-span sports stadium roof grid lifting mechanism of the present invention;

[0035] Figure 7 The present invention is a schematic diagram of the installation structure of the sliding rods in a large-span sports stadium roof grid lifting mechanism.

[0036] Figure numerals: 1, column; 2, steel roof grid; 3, lifting frame; 4, lifter; 5, first steel cable; 6, extension rod; 7, limit sleeve; 8, anchor; 9, rectangular opening; 10, sliding block; 11, bearing platform; 12, inclined plane; 13, guide hole; 14, first spring; 15, clearance groove; 16, guide rod; 17, corbel; 18, hemispherical support; 19, fixing rod; 20, top frame; 21, mounting seat; 22, hydraulic cylinder; 23, lifting plate; 24 , sleeve rod; 25, mounting hole; 26, connecting seat; 27, connecting plate; 28, second steel cable; 29, fixing seat; 30, anti-fall rod; 31, first rotating shaft; 32, sliding rod; 33, second rotating shaft; 34, connecting rod; 35, guide column; 36, rotating cylinder; 37, outer screw cylinder; 38, handle; 39, connecting strip; 40, fixing block; 41, spiral groove; 42, first sliding column; 43, second sliding column; 44, second spring; 45, positioning column. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] like Figure 1-Figure 7 A large-span sports stadium roof grid lifting mechanism is shown, which mainly includes a plurality of steel roof grids 2 spliced ​​in sequence and a plurality of columns 1 located in the steel roof grids 2. Two groups of extension rods 6 are arranged inside each steel roof grid 2, and a limiting sleeve 7 is fixedly installed on each group of extension rods 6 for connecting with the lifting mechanism during the lifting process.

[0039] A lifting frame 3 is provided on the top of each column 1, and two lifters 4 are provided on the top of the lifting frame 3. A hemispherical support 18 is provided on the top of the column 1. The lifting frame 3 is sleeved on the upper part of the column 1 through a positioning column 45, and the positioning column 45 is located below the hemispherical support 18. A plurality of brackets 17 are fixed to the outer wall of the positioning column 45, and these brackets 17 are detachably provided with fixing rods 19. The tops of the plurality of fixing rods 19 are fixedly connected to a top frame 20, and a mounting seat 21 is fixedly provided on the top of the top frame 20. Two lifters 4 penetrate and are fixedly installed on the top of the mounting seat 21. A first steel cable 5 is connected to the lifter 4, and a clamping mechanism is provided at the bottom end of the first steel cable 5 for clamping with the limiting sleeve 7.

[0040] The clamping mechanism is composed of an anchor 8, a rectangular opening 9, a guide rod 16, a sliding block 10, a bearing platform 11, an inclined surface 12, a guide hole 13, a first spring 14 and a clearance groove 15. The anchor 8 is fixedly sleeved on the bottom end of the first steel cable 5, and a guide rod 16 is arranged in the rectangular opening 9 opened thereon. The sliding block 10 is slidably arranged on the guide rod 16 through the guide hole 13. The first spring 14 is sleeved on the guide rod 16, and its two ends are respectively fixedly connected to the sliding block 10 and the inner wall of the rectangular opening 9 to provide a reset force for the sliding block 10. The side of the sliding block 10 close to the first steel cable 5 to be clamped is provided with a clearance groove 15 for accommodating the first spring 14, and the top and bottom of the side of the sliding block 10 away from the first steel cable 5 to be clamped are respectively provided with an inclined surface 12 and a bearing platform 11, and the inclined surface 12 is used to contact with the limiting sleeve 7 and push the sliding block 10 to move, and the bearing platform 11 is used to carry the limiting sleeve 7 during the lifting process.

[0041] The top of the bracket 17 is provided with a mounting hole 25, and a connecting seat 26 is detachably provided in the mounting hole 25. The connecting seat 26 includes a rotating cylinder 36 and an outer screw cylinder 37, and the outer screw cylinder 37 is threadedly connected in the mounting hole 25, and the two outer screw cylinders 37 on the same side are connected together through the connecting plate 27. A handle 38 is provided at the bottom of the outer screw cylinder 37 for easy rotation and adjustment. A guide column 35 is slidably provided in the connecting seat 26, and the guide column 35 is inserted in the fixing rod 19 to limit and guide the fixing rod 19.

[0042] The anti-fall mechanism is arranged on the connecting plate 27, and includes a fixed seat 29, an anti-fall rod 30, a sliding rod 32, a second rotating shaft 33, a first rotating shaft 31 and a connecting rod 34. The fixed seat 29 is fixed on the top of the connecting plate 27, and two anti-fall rods 30 are slidably arranged on one side of the fixed seat 29 and used in conjunction with the steel roof grid 2. The sliding rod 32 is slidably arranged on the top of the connecting plate 27, and a second rotating shaft 33 is fixed on its outer wall. The two anti-fall rods 30 are connected by the first rotating shaft 31, and two connecting rods 34 are rotatably sleeved on the outer walls of the second rotating shaft 33 and the first rotating shaft 31. When the sliding rod 32 moves, the anti-fall rod 30 is driven to extend or retract through the connecting rod 34, thereby realizing the anti-fall protection of the steel roof grid 2.

[0043] The release mechanism is arranged on the top frame 20 and cooperates with the clamping mechanism and the anti-falling mechanism. After being lifted into place and fixed, the release mechanism automatically releases the fixed connection between the limit sleeve 7 and the clamping mechanism and provides opening power for the anti-falling mechanism.

[0044] The release mechanism mainly includes components such as a hydraulic cylinder 22, a lifting plate 23, and a sleeve rod 24. The hydraulic cylinder 22 is arranged on the top of the mounting seat 21, and its output end is fixedly connected to the lifting plate 23. The lifting plate 23 is sleeved on the two first steel cables 5 to ensure that the normal operation of the first steel cables 5 will not be interfered with during the lifting process. At the bottom of the lifting plate 23, a sleeve rod 24 is fixedly provided, and the sleeve rod 24 is used in conjunction with a plurality of sliding blocks 10. When the lifting is in place, the hydraulic cylinder 22 is started, and the output end of the hydraulic cylinder 22 pushes the lifting plate 23 to move downward, thereby driving the sleeve rod 24 to move downward. The bottom of the sleeve rod 24 is designed with a structure that cooperates with the inclined surface 12 at the top of the sliding block 10. When the sleeve rod 24 moves downward, it will squeeze the inclined surface 12 of the sliding block 10, so that the sliding block 10 moves inward, thereby releasing the conflicting state between the sliding block 10 and the limiting sleeve 7, and achieving the purpose of releasing the connection.

[0045] Two second steel cables 28 are also fixedly provided at the bottom of the lifting plate 23, and the bottom ends of the second steel cables 28 are fixedly connected to the corresponding sliding rods 32. A connecting strip 39 is fixedly provided at the bottom end of the sliding rod 32, and a second spring 44 is sleeved on the outer wall of the sliding rod 32, and the two ends of the second spring 44 are respectively fixedly connected to the connecting strip 39 and the side close to each other of the connecting plate 27. When the lifting plate 23 moves downward, the second steel cables 28 are relaxed, and the second spring 44 is reset at this time. The elastic force of the second spring 44 causes the sliding rod 32 to reset and move, and through the transmission action of the connecting rod 34, the anti-fall rod 30 is driven to extend to the bottom of the steel roof grid frame 2, to protect the steel roof grid frame 2, and to ensure the safety of the steel roof grid frame 2 after the connection is released.

[0046] A fixing block 40 is rotatably provided at the bottom of the guide column 35, and the two fixing blocks 40 on the same side are fixedly connected to the corresponding connecting bars 39. In this way, when the hydraulic cylinder 22 is started to retract, not only the sliding rod 32 and the connecting bar 39 are driven to move through the second steel cable 28, but also the guide column 35 is driven to move upward through the fixing block 40, so that the guide column 35 is inserted into the fixing rod 19, the fixing rod 19 is limited, and the stability of the entire lifting mechanism is enhanced.

[0047] The outer wall of the guide column 35 is provided with a spiral groove 41, the inner wall of the rotating cylinder 36 is fixed with a plurality of second sliding columns 43 located in the spiral groove 41, and the inner wall of the fixed rod 19 is fixed with a plurality of first sliding columns 42 located in the spiral groove 41. When the guide column 35 moves during the lifting process, the second sliding columns 43 will slide in the spiral groove 41, and due to the shape characteristics of the spiral groove 41, the guide column 35 will be driven to rotate. At the same time, the first sliding column 42 will also be screwed into the spiral groove 41, generating friction with the groove wall of the spiral groove 41, further fixing the fixed rod 19, and improving the stability and safety of the entire lifting mechanism.

[0048] When the large-span sports stadium roof grid lifting mechanism is used, the lifting frame 3 is hoisted to the top of the column 1 by a crane, the connecting seat 26 is inserted into the mounting hole 25, and the handle 38 is turned to drive the outer screw barrel 37 to rotate, and the outer screw barrel 37 is screwed into the mounting hole 25 until the connecting plate 27 conflicts with the bracket 17, and then the lifting frame 3 is lowered to make the fixing rod 19 plugged into the guide column 35 until the bottom of the fixing rod 19 conflicts with the bracket 17, and the lifter 4 and the hydraulic cylinder 22 are connected to the hydraulic station below, and the hydraulic cylinder 22 is controlled to retract by the hydraulic station, which can drive the lifting plate 23 to move upward, and the lifting plate 23 moves upward. The movement can pull the two second steel cables 28 to move upward, and the upward movement of the second steel cables 28 can drive the sliding rod 32 to move upward. During the upward movement of the sliding rod 32, the anti-falling rod 30 can be driven to move through the connecting rod 34, so that one end of the anti-falling rod 30 is close to the column 1, and the connecting bar 39 below is driven to move upward. The upward movement of the connecting bar 39 can drive the guide column 35 to move upward through the fixed block 40. During the upward movement, the guide column 35 can be driven to rotate through the second sliding column 43 and the spiral groove 41, so that the upper spiral groove 41 is spirally connected to the first sliding column 42, so as to fix the fixed rod 19;

[0049] The hydraulic station controls the lifting device 4 to start, lowers the first steel cable 5, and then passes the first steel cable 5 through the limiting sleeve 7 from top to bottom. When the anchor 8 conflicts with the limiting sleeve 7, the multiple bearing platforms 11 are pressed by hand to drive the multiple bearing platforms 11 to move inward, and then the lower end of the first steel cable 5 is continuously pulled to move the anchor 8 from the top of the limiting sleeve 7 to the bottom of the limiting sleeve 7, and then the bearing platform 11 is released. At this time, the bearing platform 11 can be reset and extended under the action of the first spring 14;

[0050] The lifting device 4 is controlled by the hydraulic station to drive the first steel cable 5 to move upward. During the upward movement of the first steel cable 5, the bearing platform 11 will be driven to contact the bottom of the limit sleeve 7. Continuing to move upward can drive the steel roof grid 2 to move upward through multiple groups of extension rods 6. After moving into place, the steel roof grid 2 is connected to multiple hemispherical supports 18 through connecting pieces. After the fixation is completed, the hydraulic cylinder 22 is started to extend. The extension of the hydraulic cylinder 22 can drive the second steel cable 28 to move downward, and the sliding rod 32 can be reset downward under the action of the second spring 44. The downward movement of the sliding rod 32 can drive the two anti-fall rods 30 to extend through the two connecting rods 34, so that the anti-fall rod 30 moves to the bottom of the extension rod 6 to avoid a firm connection and falling. The downward movement of the sliding rod 32 can drive the connecting bar 39 to move downward, and drive the guide column 35 downward through the fixing block 40. When the lifting device 23 is lifted up, the guide column 35 is driven to rotate in the opposite direction through the second sliding column 43 and the spiral groove 41, thereby releasing the fixation of the fixing rod 19, and then starting the lifting device 4 to slowly lower the anchor 8, so that the sliding block 10 is away from the limiting sleeve 7, and the extension of the hydraulic cylinder 22 can drive the lifting plate 23 to move downward, and the downward movement of the lifting plate 23 can drive the sleeve rod 24 to move downward until the bottom end of the sleeve rod 24 leaks out of the bottom of the limiting sleeve 7, and then start the lifting device 4 to drive the first steel cable 5 to move upward. When the anchor 8 contacts the sleeve rod 24, multiple sliding blocks 10 can be driven inward by the sleeve rod 24, and then start the lifting device 4 at the same time to drive the first steel cable 5 to move upward, which can drive the anchor 8 to move in the sleeve rod 24 until it is separated from the top of the limiting sleeve 7; finally, the connecting seat 26 is removed from the corbel 17, and the lifting frame 3 is removed from the column 1 by the crane.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A large-span sports stadium roof grid lifting mechanism, characterized in that: It comprises a plurality of steel roof grid frames (2) spliced ​​in sequence and a plurality of columns (1) located in the steel roof grid frames (2), wherein two groups of extension rods (6) are provided in the steel roof grid frames (2) where each column (1) is located, and a limiting sleeve (7) is fixedly installed on each group of the extension rods (6); A lifting frame (3) is provided on the top of the column (1), two lifters (4) are provided through the top of the lifting frame (3), a first steel cable (5) is provided on the lifter (4), a clamping mechanism is provided at the bottom end of the first steel cable (5), and the clamping mechanism extends to the ground and is clamped with a limiting sleeve (7); A hemispherical support (18) is provided on the top of the column (1), the lifting frame (3) comprises a positioning column (45) sleeved on the upper part of the column (1), the positioning column (45) is located below the hemispherical support (18), a plurality of brackets (17) are fixedly provided on the outer wall of the positioning column (45), a fixing rod (19) is detachably provided on the bracket (17), a same top frame (20) is fixedly provided on the top of the plurality of fixing rods (19), a mounting seat (21) is fixedly provided on the top of the top frame (20), and the lifter (4) is fixedly provided on the top of the mounting seat (21); An anti-fall mechanism, arranged on two brackets (17) on the same side, for protecting the steel roof grid (2) after the limiting sleeve (7) and the clamping mechanism are released; A release mechanism is arranged on the top frame (20) and is used in conjunction with the clamping mechanism. After the lifting and fixing is in place, the limit sleeve (7) is automatically released and a power for the anti-fall mechanism to open is provided. The clamping mechanism comprises an anchor (8) fixedly sleeved on the bottom end of the first steel cable (5), a plurality of rectangular openings (9) are formed on the top of the anchor (8), a guide rod (16) is fixedly formed on the inner wall of one side of the rectangular opening (9), a sliding block (10) is slidably provided in the rectangular opening (9), a guide hole (13) is formed on one side of the sliding block (10), the guide rod (16) is slidably provided in the guide hole (13), a first spring (14) is sleeved on the outer wall of the guide rod (16), and the guide rod (16) is slidably provided in the guide hole (13). The two ends of the first spring (14) are respectively fixedly connected to one side of the sliding block (10) and the inner wall of one side of the rectangular opening (9); a side of the sliding block (10) close to the first steel cable (5) is provided with a clearance groove (15) for accommodating the first spring (14); a top of the side of the sliding block (10) away from the first steel cable (5) is provided with an inclined surface (12) for transition; and a bottom of the side of the sliding block (10) away from the first steel cable (5) is provided with a bearing platform (11) that contacts the bottom of the limiting sleeve (7); The bracket (17) is provided with a mounting hole (25) extending therethrough, a connecting seat (26) being detachably provided in the mounting hole (25), and a guide column (35) being slidably provided in the connecting seat (26); The anti-fall mechanism comprises a fixing seat (29) fixed on the top of the connecting plate (27), two anti-fall rods (30) used in conjunction with the steel roof grid (2) are slidably provided on one side of the fixing seat (29), a sliding rod (32) is slidably provided through the top of the connecting plate (27), a second rotating shaft (33) is fixedly provided on the outer wall of the sliding rod (32), a same first rotating shaft (31) is fixedly provided between the two anti-fall rods (30), two connecting rods (34) are rotatably sleeved on the outer walls of the second rotating shaft (33) and the first rotating shaft (31), and the sliding rod (32) is connected to the release mechanism; The release mechanism comprises a hydraulic cylinder (22) penetrating the top of the mounting seat (21), a lifting plate (23) being fixedly provided at the output end of the hydraulic cylinder (22), the lifting plate (23) being sleeved on two first steel cables (5), the first steel cables (5) being sleeved with sleeve rods (24) for use with a plurality of sliding blocks (10), the sleeve rods (24) being fixedly provided at the bottom of the lifting plate (23), after being lifted into place, the hydraulic cylinder (22) is started to drive the sleeve rods (24) to move downward, and the sliding block (10) is moved inward by squeezing the inclined surface (12) of the sliding block (10), thereby releasing the interference between the sliding block (10) and the limiting sleeve (7); Two second steel cables (28) are fixedly provided at the bottom of the lifting plate (23), the bottom ends of the two second steel cables (28) are fixedly connected to the corresponding sliding rods (32), the bottom ends of the sliding rods (32) are fixedly provided with a connecting strip (39), the outer wall of the sliding rod (32) is sleeved with a second spring (44), the two ends of the second spring (44) are respectively fixedly connected to the connecting strip (39) and the side of the connecting plate (27) close to each other, when the lifting plate (23) moves downward, the sliding rod (32) can be reset and moved under the action of the second spring (44), and the anti-fall rod (30) is driven to extend to the bottom of the steel roof grid frame (2) through the connecting rod (34), so as to protect the steel roof grid frame (2); A fixing block (40) is rotatably provided at the bottom of the guide column (35), and two fixing blocks (40) on the same side are fixedly connected to corresponding connecting bars (39). When the hydraulic cylinder (22) is started to retract, the guide column (35) can be driven to be inserted into the fixing rod (19), thereby limiting the position of the fixing rod (19).

2. A large-span sports stadium roof grid lifting mechanism as claimed in claim 1, characterized in that: The connecting seat (26) comprises a rotating cylinder (36) and an outer screw cylinder (37) arranged in an upper and lower arrangement. The rotating cylinder (36) is rotatably connected to the guide column (35). The outer screw cylinder (37) is rotatably arranged at the bottom of the rotating cylinder (36). The outer screw cylinder (37) is threadedly arranged in the mounting hole (25). The outer walls of the two outer screw cylinders (37) on the same side are rotatably sleeved with a same connecting plate (27). A plurality of handles (38) are fixedly arranged at the bottom of the outer screw cylinder (37).

3. A large-span sports stadium roof grid lifting mechanism as claimed in claim 2, characterized in that: The outer wall of the guide column (35) is provided with a spiral groove (41); the inner wall of the rotating cylinder (36) is fixedly provided with a plurality of second sliding columns (43) located in the spiral groove (41); the inner wall of the fixing rod (19) is fixedly provided with a plurality of first sliding columns (42) located in the spiral groove (41); when the guide column (35) is raised or lowered, the second sliding columns (43) and the spiral groove (41) drive the guide column (35) to rotate, so that the first sliding columns (42) are screwed into the spiral groove (41), thereby further fixing the fixing rod (19).

4. A construction method for a large-span sports stadium roof grid lifting mechanism according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, hoisting the lifting frame (3) onto the column (1) by means of a crane, and starting the hydraulic cylinder (22) to retract and fix the fixing rod (19) onto the bracket (17); S2, starting the lifting device (4) to lower the first steel cable (5), fixing the limit sleeve (7) by means of an anchor (8), and then lifting and hoisting the steel roof grid frame (2); S3, after the hoisting is completed, the steel roof grid (2) is connected to the hemispherical support (18) through the connecting piece, and the hydraulic cylinder (22) is started to extend to release the fixation of the fixing rod (19), and the anti-fall rod (30) is driven to extend to protect the extension rod (6); S4. Remove the connecting seat (26) from the bracket (17) and remove the lifting frame (3) from the column (1) using a crane.

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