Construction method of large-span spherical steel structure

Abstract

The present application relates to the technical field of steel structures for construction projects, and provides a construction method for a large-span spherical steel structure, comprising the following steps: S1, construction of a support system; S2, construction of a top grid shell: hoisting the top grid shell to the top of a support hanger; S3, construction of a lower ring grid: on the outside of the support hanger, multiple layers of lower ring grids are constructed sequentially from bottom to top; S4, construction of a support grid: on the outside of the support hanger, construction of a support grid; S5, construction of an upper ring grid: on the outside of the support hanger, multiple layers of upper ring grids are constructed sequentially from bottom to top; wherein both the upper ring grid and the lower ring grid include a plurality of prefabricated unit components, and the plurality of prefabricated unit components are connected end to end to form a ring shape. The construction method for a large-span spherical steel structure of the present application can improve the construction efficiency of a large-span spherical steel structure.

Description

Technical Field

[0001] The present application relates to the technical field of steel structures for construction projects, and in particular to a construction method for large-span spherical steel structures. Background Art

[0002] Spherical steel structures have been widely used in modern architecture due to their unique mechanical properties and aesthetics. With the advancement of construction technology, the design and construction technology of spherical steel structures are also constantly developing.

[0003] Currently, the high-altitude bulk assembly method is a common construction method in the industry. This method involves assembling rods one by one at high altitude, gradually forming a complete spherical steel structure. This method is suitable for the construction of complex steel structures. However, in practice, this construction method suffers from low construction efficiency and high safety risks. Furthermore, when assembling large-span spherical steel structures, the positioning of the individual rods is poor, resulting in large assembly errors in the overall structure. Therefore, a construction method suitable for large-span spherical steel structures is urgently needed to improve overall construction efficiency. Summary of the Invention

[0004] In order to improve the construction efficiency of a large-span spherical steel structure, the present application provides a construction method for a large-span spherical steel structure.

[0005] The construction method of the large-span spherical steel structure provided in this application adopts the following technical solutions:

[0006] The construction method of a large-span spherical steel structure includes the following steps: S1, building a support system: building a support hanger and a scaffolding; S2, building a top grid shell: hoisting the top grid shell to the top of the support hanger; S3, building a lower ring grid: building multiple layers of lower ring grids from bottom to top on the outside of the support hanger; S4, building a support grid: building a support grid on the outside of the support hanger; S5, building an upper ring grid: building multiple layers of upper ring grids from bottom to top on the outside of the support hanger; the lowermost upper ring grid is connected to the uppermost lower ring grid, and the uppermost upper ring grid is connected to the top grid shell; wherein the upper ring grid and the lower ring grid both include multiple prefabricated unit components, and the multiple prefabricated unit components are connected end to end to form a ring shape.

[0007] By adopting the above-mentioned technical solution, when constructing the spherical steel structure, the prefabricated top grid shell is first installed on the top of the support hanger. The lower ring grid frame, support grid frame, and upper ring grid frame are then sequentially constructed on the outside of the support hanger, so that the lower ring grid frame, support grid frame, upper ring grid frame, and top grid shell are combined to form a spherical steel structure. The lower ring grid frame and the upper ring grid frame are both prefabricated from multiple prefabricated unit components and transported to the site for welding and assembly, greatly shortening the on-site assembly time and improving the construction efficiency of the overall structure. At the same time, the support grid frame connects all the lower ring grid frames, upper ring grid frames, and top grid shell in series, improving the stability of the overall structure.

[0008] Optionally, in step S4, a plurality of support grids are arranged at intervals around the outer side of the support hanger, and each of the support grids is arranged in an arc shape as a whole to support the inner side of the upper ring grid; the lower end of the support grid is connected to the lower ring grid, and the upper end of the support grid is connected to the top grid shell.

[0009] By adopting the above technical solution, the supporting grid is arranged in an arc shape to support the inner side of the upper ring grid, thereby connecting the lower ring grid, the upper ring grid and the top shell in series. By setting up multiple supporting grids, the stability of the spherical steel structure is improved.

[0010] Optionally, in step S1, when the support hanger is constructed, a lifting platform is constructed outside the support hanger, and the lifting platform is provided with a positioning mechanism for positioning the prefabricated unit components.

[0011] By adopting the above-mentioned technical solution, as multiple layers of lower and upper ring grids are erected sequentially from bottom to top, the positioning mechanism locates the prefabricated unit components, ensuring a high degree of alignment between adjacent prefabricated unit components and reducing assembly errors of the overall structure. From bottom to top, after each layer of lower ring grid (or upper ring grid) is completed, the lifting platform is forced to rise one stroke, allowing the positioning mechanism to sequentially position the multiple layers of lower ring grid (or upper ring grid), ensuring the quality of the spherical steel structure's splicing.

[0012] Optionally, the positioning mechanism includes a rotating frame, a sliding frame, a clamping fastener, a telescopic assembly and a rotating assembly, the rotating frame is rotatably installed on the lifting platform, and the sliding frame is slidably installed on the rotating frame; the clamping fastener is arranged at one end of the sliding frame away from the rotating frame for clamping the prefabricated unit component, the telescopic assembly is arranged on the lifting platform for driving the sliding frame to slide radially along the lifting platform, and the rotating assembly is arranged on the lifting platform for driving the rotating frame to rotate.

[0013] By adopting the above technical solution, when the bottom ring grid is erected, the telescopic assembly forces the sliding frame to extend outward. The prefabricated unit components are then fastened to the sliding frame via clamping fasteners to position the prefabricated unit components. After the welding and fixation are completed, the sliding frame is retracted inward, and the rotating assembly forces the rotating frame to rotate a certain angle, and then the sliding frame is extended outward, so that the sliding frame can be used to position the adjacent prefabricated unit components. This process is repeated. After the rotating frame rotates multiple times, the bottom ring grid is erected and positioned. The lifting platform is then driven to rise one stroke, and the second set of lower ring grids can be erected above the bottom layer. This process is repeated. After the lifting platform is raised multiple times, the multiple lower ring grids and multiple upper ring grids are successively erected. The provision of the sliding frame has a "centering" effect. The prefabricated unit components in each lower ring grid and each upper ring grid are positioned by the sliding frame during installation, greatly improving the overall assembly accuracy.

[0014] Optionally, the telescopic assembly includes a lifting bar, a first sliding block, a second sliding block and a driving member, the lifting bar is slidably installed on the top of the rotating frame, the first sliding block is slidably installed on the bottom of the lifting bar, and the second sliding block is slidably installed on the top of the rotating frame, and multiple first sliding blocks and second sliding blocks are arranged at intervals along the radial direction of the lifting platform, and the sliding frame is connected to one of the second sliding blocks; a connecting rod is connected between each first sliding block and two adjacent second sliding blocks, one end of the connecting rod is hinged to the first sliding block, and the other end is hinged to the second sliding block; the driving member is arranged on the lifting platform to drive the lifting bar to rise and fall.

[0015] By adopting the above-mentioned technical solution, the first and second sliding blocks are connected in series via a connecting rod, so that when the driving member drives the lifting bar to move up or down, the sliding frame can slide radially along the lifting platform. When the lifting bar drives the sliding frame to extend, the sliding frame can position the prefabricated unit component and weld the positioned prefabricated unit component to secure it. When the sliding frame is driven back, it is forced to disengage the fixed prefabricated unit component to facilitate the positioning of the next prefabricated unit component, thereby improving the operational convenience of the overall structure.

[0016] Optionally, a lifting ring is slidably installed on the top of the lifting platform, and one end of the lifting bar is rotatably installed on the outer wall of the lifting ring; the driving part includes a driving screw and a driving motor; the driving screw is rotatably installed on the lifting platform, and the driving screw is passed through the lifting ring and is threadedly connected to the lifting ring; the driving motor is arranged on the lifting platform, and the output shaft of the driving motor is coaxially connected to the driving screw.

[0017] By adopting the above technical solution, the rotation of the driving screw drives the lifting ring to move up and down, thereby driving the lifting bar to move up and down, thereby allowing the sliding frame to extend or retract. The setting of the lifting ring enables the lifting bar to be rotatably connected to the lifting platform, thereby enabling the rotating frame to rotate.

[0018] Optionally, two sliding frames are symmetrically arranged around the central axis of the rotating frame, and the clamping fastener is provided at one end of each sliding frame away from the rotating frame.

[0019] By adopting the above technical solution, on the one hand, the arrangement of two sets of sliding frames balances the forces on both sides of the rotating frame, improving the stability of the overall structure. On the other hand, the arrangement of two sets of sliding frames can achieve synchronous positioning of two prefabricated unit components, improving the construction efficiency of the overall structure.

[0020] Optionally, a flip frame is rotatably mounted on one end of the sliding frame away from the rotating frame, and the clamping fastener is provided on the flip frame; a flip assembly is provided between the sliding frame and the flip frame, and when the sliding frame moves toward the rotating frame, the flip assembly forces the flip frame to gradually flip toward a horizontal state, and when the sliding frame moves toward the side away from the rotating frame, the flip assembly forces the flip frame to gradually flip toward a vertical state.

[0021] By adopting the above-mentioned technical solution, when positioning the prefabricated unit components, the sliding frame is driven to extend outward, and the flip frame is flipped at a certain angle under the action of the flip assembly, so that the clamping fasteners of the flip frame can position the prefabricated unit components. The flip frame is set to a rotating connection so that the clamping fasteners can adapt to the positioning of prefabricated unit components of different heights.

[0022] Optionally, the flip frame is provided with a rotating shaft, the rotating shaft is rotatably mounted on the sliding frame, and the flip frame is rotatably mounted on the sliding frame via the rotating shaft; the sliding frame is rotatably mounted with a first rotating rod, and the first rotating rod and the rotating shaft are circumferentially linked; the flip assembly includes a first gear and a first rack, the first gear is coaxially arranged on the first rotating rod, the first rack is arranged on the rotating frame, the two ends of the first rack are extended along the sliding direction of the sliding frame, and the first gear and the first rack are engaged for transmission.

[0023] By adopting the above-mentioned technical solution, when the sliding frame extends outward, the first gear and the first rack engage with each other, thereby driving the first rotating rod to rotate. The first rotating rod and the rotating shaft are circumferentially linked, thereby driving the flip frame to rotate about the central axis of the rotating shaft, so as to position the prefabricated unit components. After the lowest ring grid is completed, the lifting platform is driven to rise a stroke, and then the sliding frame is driven to extend outward (the distance the sliding frame extends is greater than the distance the lowest ring grid is extended when it is positioned), so that the flip frame flips at a greater angle than the angle the flip frame flips when the lowest ring grid is positioned, thereby enabling the prefabricated unit components to be adaptively positioned, thereby improving the operational convenience of the overall structure.

[0024] Optionally, a dividing line is formed between the lower ring grid and the upper ring grid, and the sliding frame is provided with a reversing component. When the lifting platform is lifted and crosses the dividing line, the reversing component is used to switch the rotation direction of the rotating shaft.

[0025] By adopting the above technical solution, since the lower ring grid and the upper ring grid are symmetrically distributed along the dividing line, when the multi-layer lower ring grid is fully built, the rotation direction of the rotating shaft is changed by the reversing component so that the flipping direction of the flip frame can be changed, thereby adapting to the positioning of the upper ring grid and improving the flexibility of the overall structure.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Through the setting of prefabricated unit components, when the spherical steel structure is erected, the prefabricated top grid shell is first installed on the top of the support hanger, and the lower ring grid frame, support grid frame and upper ring grid frame are sequentially erected on the outside of the support hanger, so that the lower ring grid frame, support grid frame, upper ring grid frame and top grid shell are combined to form a spherical steel structure. The lower ring grid frame and the upper ring grid frame are both prefabricated from multiple prefabricated unit components and transported to the site for welding and assembly, which greatly shortens the time for on-site assembly and improves the construction efficiency of the overall structure. At the same time, the support grid frame is used to connect all the lower ring grid frames, upper ring grid frames and top grid shell in series to improve the stability of the overall structure.

[0028] 2. Through the setting of the positioning mechanism, when the multiple layers of lower ring grid and upper ring grid are erected sequentially from bottom to top, the positioning mechanism locates the position of the prefabricated unit components, ensuring a high degree of alignment between two adjacent prefabricated unit components and reducing the assembly error of the overall structure. From bottom to top, after each layer of lower ring grid (or upper ring grid) is erected, the lifting platform is forced to rise one stroke, so that the positioning mechanism can sequentially provide positioning effect for the multiple layers of lower ring grid (or upper ring grid), ensuring the splicing quality of the spherical steel structure;

[0029] 3. Through the configuration of the flip assembly, when the sliding frame extends outward, the first gear and the first rack engage in a transmission, thereby driving the first rotating rod to rotate. The first rotating rod and the rotating shaft are circumferentially linked, thereby driving the flip frame to rotate about the central axis of the rotating shaft to position the prefabricated unit components. For example, after the lowest ring grid is completed, the lifting platform is driven to rise a stroke, and then the sliding frame is driven to extend outward (the distance the sliding frame extends is greater than the distance the lowest ring grid is extended when it is positioned). This causes the flip angle of the flip frame to be greater than the angle of the flip angle when the lowest ring grid is positioned. This allows the prefabricated unit components to be adaptively positioned, improving the operational convenience of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow diagram of Example 1;

[0031] Figure 2 This is a schematic diagram of the structure of the lower ring grid, the upper ring grid and the top grid shell in Example 1;

[0032] Figure 3 This is a schematic diagram of the structure of the support grid embodying Example 1;

[0033] Figure 4 This is a schematic structural diagram of the lower ring grid according to Example 1;

[0034] Figure 5 This is a schematic structural diagram of a prefabricated unit component according to Example 1;

[0035] Figure 6 This is a schematic diagram of the structure of the lifting platform embodied in Example 2;

[0036] Figure 7 This is a schematic structural diagram of the positioning mechanism of Example 2;

[0037] Figure 8 This is a schematic structural diagram of a turning frame according to Example 2;

[0038] Figure 9 This is a schematic structural diagram of the flip assembly and the reversing assembly according to Example 3;

[0039] Figure 10 yes Figure 9 Enlarged view of point A in the middle.

[0040] Explanation of reference numerals: 1. Support hanger; 2. Top grid shell; 3. Lower ring grid; 4. Support grid; 5. Upper ring grid; 6. Prefabricated unit component; 61. Main rod; 62. Connecting rod; 7. Lifting platform; 71. Lifting ring; 711. Rotating ring; 72. Travel wheel; 73. Guide rod; 8. Positioning mechanism; 81. Rotating frame; 811. Second slide rail; 82. Sliding frame; 821. First rotating rod; 83. Clamping fastener; 831. Clamping column; 832. Guide head; 833. Guide surface; 834. Deformation groove; 84. Telescopic assembly; 841. Lifting bar; 842. First sliding block ;843, second sliding block;844, connecting rod;845, driving screw;846, driving motor;847, first slide rail;85, rotating assembly;851, rotating gear;852, rotating ring gear;853, first motor;86, flip frame;861, rotating shaft;87, flip assembly;871, first gear;872, first rack;873, second rotating rod;874, second motor;88, reversing assembly;881, second rack;882, guide block;883, push bar;884, connecting bar;885, reset spring;886, guide surface;887, push rod. DETAILED DESCRIPTION

[0041] The following combination Figures 1-10 This application is described in further detail. Example 1

[0042] The embodiments of the present application disclose a construction method for a large-span spherical steel structure.

[0043] Reference Figure 1 、 Figure 2 The construction method of a large-span spherical steel structure comprises the following steps:

[0044] S1. Construction of the support system: at a preset location on site, the support hanger 1 and the scaffolding are constructed in sequence. The scaffolding (not shown in the figure) is constructed outside the support hanger 1.

[0045] S2. Construction of the top grid shell 2: Use a traveling crane (the traveling crane can be an electric hoist) to hoist the prefabricated top grid shell 2 to the top of the supporting hanger 1. The top grid shell 2 and the supporting hanger 1 can be pre-fixed by bolts.

[0046] S3. Building the lower ring grid 3: On the outside of the support hanger 1, multiple layers of lower ring grids 3 are built from bottom to top. Two adjacent layers of lower ring grids 3 can be connected by welding.

[0047] S4. Construction of the support grid 4: The support grid 4 is constructed on the outside of the support hanger 1. Multiple support grids 4 are arranged at intervals around the outside of the support hanger 1. Each support grid 4 is arranged in an arc shape as a whole. The lower end of the support grid 4 is connected to the lower ring grid 3, and the upper end of the support grid 4 is connected to the top grid shell 2. The support grid 4 and the lower ring grid 3, as well as the support grid 4 and the top grid shell 2 can be connected by welding.

[0048] S5, the construction of the upper ring grid 5, on the outside of the supporting hanger 1, the construction of multiple layers of upper ring grids 5 is carried out from bottom to top; the two adjacent layers of upper ring grids 5 can be connected by welding, the lowermost layer of upper ring grid 5 and the uppermost layer of lower ring grid 3, and the uppermost layer of upper ring grid 5 and the top grid shell 2 are all connected by welding, and the supporting grid 4 supports the inner side of each layer of upper ring grid 5.

[0049] Reference Figure 3 、 Figure 4 、 Figure 5 In this embodiment, the upper ring grid 5 and the lower ring grid 3 both include a plurality of prefabricated unit components 6, which are connected end to end to form a ring shape, and two adjacent prefabricated unit components 6 are connected by welding; the prefabricated unit components 6 include two main rods 61 and a plurality of connecting rods 62, and the plurality of connecting rods 62 are all arranged between the two main rods 61, and the two ends of each connecting rod 62 are respectively welded and fixed to the two main rods 61.

[0050] The implementation principle of Example 1 of the present application is as follows: When constructing the spherical steel structure, the prefabricated and assembled top grid shell 2 is first installed on the top of the support hanger 1. The lower ring grid 3, the support grid 4, and the upper ring grid 5 are then sequentially constructed on the outside of the support hanger 1, so that the lower ring grid 3, the support grid 4, the upper ring grid 5, and the top grid shell 2 are combined to form the spherical steel structure. The lower ring grid 3 and the upper ring grid 5 are both prefabricated from multiple prefabricated unit components 6, which are then transported to the site for welding and assembly, greatly shortening the on-site assembly time and improving the construction efficiency of the overall structure.

[0051] In addition, the supporting grid 4 is arranged in an arc shape to support the inner side of the upper ring grid 5, thereby connecting the lower ring grid 3, the upper ring grid 5 and the top shell in series. By setting up multiple supporting grids 4, the stability of the spherical steel structure is improved. Example 2

[0052] The embodiments of the present application disclose a construction method for a large-span spherical steel structure.

[0053] The construction method of the large-span spherical steel structure disclosed in the embodiment of the present application differs from that in embodiment 1 in that:

[0054] Reference Figure 6 、 Figure 7 In this embodiment, in step S1, when the support hanger 1 is erected, the lifting platform 7 is erected on the outside of the support hanger 1. The lifting platform 7 is ring-shaped. The lifting platform 7 is mounted on the outside of the support hanger 1 from top to bottom through a traveling crane. A plurality of running wheels 72 are rotatably installed on the inner wall of the lifting platform 7. The running wheels 72 abut against the side wall of the support hanger 1. The lifting and lowering of the lifting platform 7 is driven by the traveling crane.

[0055] The lifting platform 7 is provided with a positioning mechanism 8 for positioning the prefabricated unit component 6. In this embodiment, the positioning mechanism 8 includes a rotating frame 81, a sliding frame 82, a clamping fastener 83, a telescopic assembly 84 and a rotating assembly 85. The rotating frame 81 is rotatably installed on the lifting platform 7, and the rotating assembly 85 is arranged on the lifting platform 7 to drive the rotating frame 81 to rotate around the central axis of the lifting platform 7.

[0056] The rotating assembly 85 includes a rotating gear 851, a rotating ring gear 852 and a first motor 853. The rotating gear 851 is rotatably mounted on the lifting platform 7. The rotating ring gear 852 is coaxially fixed to the inner circumferential wall of the rotating frame 81. The rotating gear 851 and the rotating ring gear 852 are engaged in transmission. The first motor 853 is fixedly mounted on the lifting platform 7. The output shaft of the first motor 853 is coaxially connected to the rotating gear 851.

[0057] Reference Figure 7 、 Figure 8 The sliding frame 82 is slidably installed on the rotating frame 81. In this embodiment, there are two groups of sliding frames 82. The two groups of sliding frames 82 are symmetrically distributed around the rotation axis of the rotating frame 81. The telescopic assembly 84 is set on the lifting platform 7 to drive the two groups of sliding frames 82 to slide radially along the lifting platform 7.

[0058] The telescopic assembly 84 includes a lifting bar 841, a first sliding block 842, a second sliding block 843, and a drive element. Two lifting bars 841 are provided, corresponding to the two sliding frames 82. Each lifting bar 841 is slidably mounted on the top of the rotating frame 81 and positioned above its corresponding sliding frame 82. A first slide rail 847 is fixedly mounted on the bottom of the lifting bar 841. The ends of the first slide rail 847 extend radially along the lifting platform 7. Multiple first slide blocks 842 are slidably mounted on the first slide rail 847, with multiple first slide blocks 842 spaced apart along the length of the first slide rail 847. A second slide rail 811 is fixedly mounted on the top wall of the rotating frame 81. The ends of the second slide rail 811 extend radially along the lifting platform 7. Multiple second slide blocks 843 are slidably mounted on the second slide rail 811, with multiple second slide blocks 843 spaced apart along the length of the second slide rail 811.

[0059] Reference Figure 7 、 Figure 8The sliding frame 82 is slidably mounted on the second slide rail 811 and is fixedly connected to the second sliding block 843 farthest from the support hanger 1. The second sliding block 843 closest to the support hanger 1 is fixedly connected to the second slide rail 811 via a bolt connection (i.e., the second sliding block 843 closest to the support hanger 1 cannot move). A connecting rod 844 is connected between each first sliding block 842 and two adjacent second sliding blocks 843. One end of the connecting rod 844 is hinged to the first sliding block 842, and the other end is hinged to the second sliding block 843.

[0060] A lifting ring 71 is slidably mounted on the top of the lifting platform 7. The lifting platform 7 is also equipped with multiple guide rods 73. The guide rods 73 are vertically arranged, with the lower ends of the guide rods 73 fixedly connected to the top wall of the lifting platform 7. The upper ends of the guide rods 73 pass through the lifting ring 71. The lifting ring 71 is slidably mounted on the lifting platform 7 via the multiple guide rods 73 to enable lifting. A rotating ring 711 is rotatably mounted on the outer peripheral wall of the lifting ring 71. The adjacent ends of the two lifting bars 841 are both fixedly connected to the outer peripheral wall of the rotating ring 711.

[0061] Reference Figure 7 、 Figure 8 A drive member is provided on the lifting platform 7 for driving the lifting bar 841 to move upward and downward. The drive member includes a drive screw 845 and a drive motor 846. The drive screw 845 is vertically arranged, with its lower end rotatably mounted on the lifting platform 7. The drive screw 845 passes through the lifting ring 71 and is threadedly connected to the lifting ring 71 (the threads of the drive screw 845 are not shown in the figure). The drive motor 846 is fixedly mounted on the lifting platform 7, and the output shaft of the drive motor 846 is coaxially connected to the drive screw 845. It should be noted that in this embodiment, the drive motor 846 and the first motor 853 are symmetrically distributed around the central axis of the lifting platform 7.

[0062] Reference Figure 6 、 Figure 8 In this embodiment, a flip frame 86 is provided at one end of each sliding frame 82 away from the rotating frame 81. The flip frame 86 is connected to a rotating shaft 861. The axial direction of the rotating shaft 861 is perpendicular to the central axis of the lifting platform 7. The rotating shaft 861 is rotatably installed on the sliding frame 82, and the flip frame 86 is rotatably installed on the sliding frame 82 through the rotating shaft 861; the number of clamping fasteners 83 is set corresponding to the number of sliding frames 82, and each clamping fastener 83 is installed on the flip frame 86 of the corresponding sliding frame 82 for clamping the prefabricated unit component 6.

[0063] The clamping fastener 83 includes a plurality of clamping columns 831, which are elastically arranged, and one end of the clamping column 831 is fixedly installed on the side wall of the turning frame 86; the clamping column 831 is used to be inserted between two adjacent connecting rods 62 in the prefabricated unit component 6, and a guide head 832 is fixed on the end face of the clamping column 831 away from the turning frame 86, and the outer diameter of the guide head 832 is larger than the outer diameter of the clamping column 831, and the guide head 832 has a guide surface 833, and the guide head 832 is provided with a deformation groove 834, which extends to the clamping column 831.

[0064] Reference Figure 6 、 Figure 8 A flip assembly 87 is provided between the sliding frame 82 and the flip frame 86. When the sliding frame 82 moves toward the rotating frame 81, the flip assembly 87 forces the flip frame 86 to gradually flip toward a horizontal state. When the sliding frame 82 moves toward the side away from the rotating frame 81, the flip assembly 87 forces the flip frame 86 to gradually flip toward a vertical state.

[0065] In this embodiment, the flip assembly 87 includes a second rotating rod 873 and a second motor 874. The second rotating rod 873 is rotatably installed on the sliding frame 82. The rotating shaft 861 and the second rotating rod 873 are connected in series through a belt so that the rotating shaft 861 and the second rotating rod 873 are circumferentially linked (that is, when the second rotating rod 873 rotates, it can drive the rotating shaft 861 to rotate synchronously); the second motor 874 is fixedly installed on the side wall of the sliding frame 82, and the output shaft of the second motor 874 is coaxially connected to the second rotating rod 873.

[0066] The implementation principle of Example 2 of the present application is as follows: when the bottom-level lower ring grid 3 is being erected, the sliding frame 82 is forced to extend outward, and then the prefabricated unit components 6 are fastened to the sliding frame 82 via the clamping columns 831 to position the prefabricated unit components 6. After the welding and fixing is completed, the sliding frame 82 is retracted inward to disengage the clamping columns 831 from the welded prefabricated unit components 6, and the rotating frame 81 is forced to rotate a certain angle, and then the sliding frame 82 is extended outward so that the sliding frame 82 can be used to position the adjacent prefabricated unit components 6. This process is repeated, and after the rotating frame 81 rotates multiple times, the construction and positioning of the bottom-level lower ring grid 3 is completed.

[0067] Then, the lifting platform 7 is driven to rise one stroke, and the second layer of lower ring grid 3 can be continued to be built above the lowest layer. This process is repeated. After the lifting platform 7 is raised multiple times, multiple lower ring grids 3 and multiple upper ring grids 5 are successively built. The setting of the sliding frame 82 plays a "centering" effect. The prefabricated unit components 6 in each lower ring grid 3 and each upper ring grid 5 are positioned by the sliding frame 82 during installation, greatly improving the overall assembly accuracy.

[0068] The setting of the turning frame 86 allows the turning angle of the turning frame 86 to be controlled every time the lifting platform 7 is lifted one stroke, so that the clamping column 831 of the turning frame 86 can adapt to clamp the prefabricated unit components 6 of different heights, thereby adapting to the positioning of prefabricated unit components 6 of different heights. Example 3

[0069] The embodiments of the present application disclose a construction method for a large-span spherical steel structure.

[0070] The construction method of the large-span spherical steel structure disclosed in the embodiment of this application differs from that in embodiment 2 in that:

[0071] Reference Figure 9 、 Figure 10 In this embodiment, the sliding frame 82 is rotatably installed with a first rotating rod 821, and the rotating shaft 861 and the first rotating rod 821 are connected in series through a belt, so that the rotating shaft 861 and the first rotating rod 821 are circumferentially linked (that is, when the first rotating rod 821 rotates, it can drive the rotating shaft 861 to rotate synchronously); the flip assembly 87 includes a first gear 871 and a first rack 872, the first gear 871 is coaxially fixed to the outer peripheral wall of one end of the first rotating rod 821, the first rack 872 is installed on the rotating frame 81, and the two ends of the first rack 872 are extended along the sliding direction of the sliding frame 82, and the first gear 871 and the first rack 872 are engaged for transmission.

[0072] A dividing line (not shown in the figure) is formed between the lower ring grid 3 and the upper ring grid 5. The sliding frame 82 is provided with a reversing component 88. When the lifting platform 7 is lifted and crosses the dividing line, the reversing component 88 is used to switch the rotation direction of the rotating shaft 861.

[0073] The reversing assembly 88 includes a second rack 881, a guide block 882 and a push bar 883. The second rack 881 is slidably installed on the rotating frame 81 so that it can slide along the axial direction of the first rotating rod 821. The length direction of the second rack 881 is consistent with the length direction of the first rack 872. A connecting bar 884 is provided between the first rack 872 and the second rack 881. The first rack 872 and the second rack 881 are fixedly connected by the connecting bar 884; the first rack 872 and the second rack 881 are axially offset along the first rotating shaft 861, and a reset spring 885 is installed between the second rack 881 and the rotating frame 81. Under normal circumstances, the reset spring 885 forces the first rack 872 to engage with the first gear 871 for transmission.

[0074] The guide block 882 is fixedly mounted with the side wall of the second rack 881, and the guide block 882 has a guide surface 886; the push bar 883 is slidably mounted on the top of the rotating frame 81, and the sliding direction of the push bar 883 is consistent with the length direction of the second rack 881. The side wall of the push bar 883 is connected with a push rod 887, and the push rod 887 extends to the flip frame 86 away from the end of the push bar 883 for the operator to push by hand. When the push rod 887 is forced to slide toward the side close to the rotating frame 81, the push bar 883 pushes the guide block 882 through the guide surface 886 and forces the second rack 881 to slide, so that the second rack 881 is engaged with the first gear 871, and when the second rack 881 is engaged with the first gear 871, the first rack 872 is disengaged from the first gear 871.

[0075] It should be noted that, in the present embodiment, the transmission ratio between the rotating shaft 861 and the first rotating rod 821 is controlled by a belt, that is, the outer diameter of the pulley of the first rotating rod 821 is smaller than the outer diameter of the pulley of the rotating shaft 861 (the size difference between the two pulleys is not reflected in the figure). This is used to control the rotation angle of the rotating shaft 861, so that after each lifting stroke of the lifting platform 7, the maximum flipping angle of the flip frame 86 can be controlled within the set range.

[0076] The implementation principle of Example 3 of the present application is as follows: when the lower ring grid 3 is being erected, the first rack 872 and the second rack 881 are engaged, and when the sliding frame 82 is extended outward, the turning frame 86 is forced to turn over a certain angle, so that the clamping column 831 can adapt and clamp the prefabricated unit components 6. After the construction of a layer of lower ring grid 3 is completed, the lifting platform 7 is driven to lift a stroke, and then the sliding frame 82 is driven to extend outward. Since the length of the sliding frame 82 extended at this time is greater than the length of the sliding frame 82 extended when the lower ring grid 3 was erected, the turning angle of the turning frame 86 is greater than the turning angle of the turning frame 86 when the lower ring grid 3 was erected, so that the clamping column 831 can clamp and position the prefabricated unit components 6 of different heights, thereby improving the positioning accuracy during welding.

[0077] When all the lower ring grids 3 are built (i.e. the lifting platform 7 crosses the dividing line), the push rod 887 is used to switch so that the second rack 881 and the first gear 871 are engaged to change the flipping direction of the flip frame 86, so that the clamping column 831 of the flip frame 86 can adapt and clamp the prefabricated unit components 6 of the upper ring grid 5, thereby improving the operational convenience of the overall structure.

[0078] The above are preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. The construction method of a large-span spherical steel structure is characterized by: The invention comprises the following steps: S1, construction of the support system: construction of the support hanger (1) and the scaffolding; S2, construction of the top grid shell (2): hoisting the top grid shell (2) to the top of the support hanger (1); S3, construction of the lower ring grid (3): construction of multiple layers of lower ring grids (3) from bottom to top on the outside of the support hanger (1); S4, construction of the support grid (4): construction of the support grid (4) from bottom to top on the outside of the support hanger (1); S5, construction of the upper ring grid (5): construction of multiple layers of upper ring grids (5) from bottom to top on the outside of the support hanger (1); the lowermost upper ring grid (5) is connected to the uppermost lower ring grid (3), and the uppermost upper grid (5) is connected to the lowermost lower ring grid (3). The ring grid (5) is connected to the top grid shell (2); wherein, the upper ring grid (5) and the lower ring grid (3) both include a plurality of prefabricated unit components (6), and the plurality of prefabricated unit components (6) are connected end to end to form a ring shape; in step S1, when the support hanger (1) is built, a lifting platform (7) is built on the outside of the support hanger (1), and the lifting platform (7) is provided with a positioning mechanism (8) for positioning the prefabricated unit components (6); the positioning mechanism (8) includes a rotating frame (81), a sliding frame (82), a clamping fastener (83), a telescopic component (84) and a rotating component (85), the rotating frame (81) is rotatably installed on the lifting platform (7), and the sliding frame (82) is slidably mounted on the rotating frame (81); the clamping fastener (83) is arranged at one end of the sliding frame (82) away from the rotating frame (81) for clamping the prefabricated unit component (6); the telescopic component (84) is arranged on the lifting platform (7) for driving the sliding frame (82) to slide along the radial direction of the lifting platform (7); the rotating component (85) is arranged on the lifting platform (7) for driving the rotating frame (81) to rotate; the sliding frame (82) is rotatably mounted on one end away from the rotating frame (81) with a flip frame (86), the clamping fastener (83) is arranged on the flip frame (86); a flip component (87) is provided between the sliding frame (82) and the flip frame (86), when the When the sliding frame (82) moves toward the rotating frame (81), the flip assembly (87) forces the flip frame (86) to gradually flip toward a horizontal state. When the sliding frame (82) moves toward a side away from the rotating frame (81), the flip assembly (87) forces the flip frame (86) to gradually flip toward a vertical state. The flip frame (86) is provided with a rotating shaft (861), and the rotating shaft (861) is rotatably mounted on the sliding frame (82). The flip frame (86) is rotatably mounted on the sliding frame (82) via the rotating shaft (861). The sliding frame (82) is rotatably mounted with a first rotating rod (821), and the first rotating rod (821) and the rotating shaft (861) are circumferentially linked.The flip assembly (87) includes a first gear (871) and a first rack (872), wherein the first gear (871) is coaxially arranged on the first rotating rod (821), and the first rack (872) is arranged on the rotating frame (81), and both ends of the first rack (872) are extended along the sliding direction of the sliding frame (82), and the first gear (871) and the first rack (872) are meshed and transmitted.

2. The construction method of a large-span spherical steel structure according to claim 1, characterized in that: In step S4, a plurality of support grids (4) are arranged at intervals around the outer side of the support hanger (1), and each support grid (4) is arranged in an arc shape as a whole to support the inner side of the upper ring grid (5); the lower end of the support grid (4) is connected to the lower ring grid (3), and the upper end of the support grid (4) is connected to the top grid shell (2).

3. The construction method of a large-span spherical steel structure according to claim 1, characterized in that: The telescopic assembly (84) includes a lifting bar (841), a first sliding block (842), a second sliding block (843) and a driving member, wherein the lifting bar (841) is slidably mounted on the top of the rotating frame (81), the first sliding block (842) is slidably mounted on the bottom of the lifting bar (841), and the second sliding block (843) is slidably mounted on the top of the rotating frame (81), and a plurality of the first sliding blocks (842) and the second sliding blocks (843) are arranged at intervals along the radial direction of the lifting platform (7), and the sliding frame (82) is connected to one of the second sliding blocks (843); a connecting rod (844) is connected between each of the first sliding blocks (842) and two adjacent second sliding blocks (843), one end of the connecting rod (844) is hinged to the first sliding block (842), and the other end is hinged to the second sliding block (843); the driving member is arranged on the lifting platform (7) to drive the lifting bar (841) to move up and down.

4. The construction method of a large-span spherical steel structure according to claim 3 is characterized in that: A lifting ring (71) is slidably mounted on the top of the lifting platform (7), and one end of the lifting strip (841) is rotatably mounted on the outer peripheral wall of the lifting ring (71); the driving member comprises a driving screw (845) and a driving motor (846); the driving screw (845) is rotatably mounted on the lifting platform (7), the driving screw (845) is passed through the lifting ring (71) and is threadedly connected to the lifting ring (71); the driving motor (846) is arranged on the lifting platform (7), and the output shaft of the driving motor (846) is coaxially connected to the driving screw (845).

5. The construction method of a large-span spherical steel structure according to claim 1 is characterized in that: Two sliding frames (82) are symmetrically arranged around the central axis of the rotating frame (81), and the clamping fastener (83) is arranged at one end of each sliding frame (82) away from the rotating frame (81).

6. The construction method of a large-span spherical steel structure according to claim 1 is characterized in that: A dividing line is formed between the lower ring grid (3) and the upper ring grid (5), and the sliding frame (82) is provided with a reversing assembly (88). When the lifting platform (7) is lifted and crosses the dividing line, the reversing assembly (88) is used to switch the rotation direction of the rotating shaft (861).

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