Construction method of large-span overhanging steel structure

Abstract

The invention discloses a construction method of a large-span overhanging steel structure, and belongs to the technical field of building construction. Comprising the following construction steps that a steel structure is prefabricated, specifically, one steel structure is prepared into three assembly sections according to the length of the needed steel structure; according to the length and the position of the steel structure, a top truss and a bottom truss are constructed at the two ends of the steel structure correspondingly; temporary supports are installed, specifically, the first temporary support, the second temporary support and the third temporary support are installed in the construction area according to the three splicing sections and the length and the installation position of the top truss; mounting a high cantilever section, a middle cantilever section and a low cantilever section; mounting purlines: vertically mounting a plurality of purlines on the high cantilever section, the middle cantilever section and the low cantilever section; and the temporary supports are removed, wherein after the purlines are installed, the temporary supports are removed. According to the technical scheme, the stability and safety of the large-span overhanging steel structure in the construction process are improved, and then the construction effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to a construction method of a large-span suspended steel structure. Background Art

[0002] With the development of economy and science and technology, the functional requirements of large public buildings have gradually expanded from indoor to outdoor space. As a result, permanent buildings featuring outdoor canopies have emerged to provide shelter from wind and rain for large-scale and wide-ranging outdoor activities.

[0003] The construction of outdoor canopies often requires a large-span overhanging steel structure as a skeleton support. However, during construction, the large-span overhanging steel structure has the characteristics of large span and being distributed at high altitudes, which leads to relatively large construction difficulties.

[0004] In the construction of large-span overhanging steel structures, how to control the stability of the steel structure during construction is a key factor in ensuring the construction effect of large-span overhanging steel structures (accurately positioning construction, improving construction efficiency, and avoiding safety hazards during construction). Therefore, a construction method for large-span overhanging steel structures is proposed. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a construction method for a large-span suspended steel structure, so as to improve the stability and safety during the construction of the large-span suspended steel structure, thereby improving the construction effect.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a construction method for a large-span suspended steel structure, comprising the following construction steps:

[0008] Prefabricated steel structure: According to the required length of the steel structure, one steel structure is prepared into three assembled segments, wherein the three assembled segments are respectively a high overhang beam segment, a middle overhang beam segment and a low overhang beam segment;

[0009] Construction of end trusses: According to the length and position of the steel structure, the top truss and bottom truss are constructed at both ends of the steel structure respectively. The top truss is fixed on the concrete stand, and the bottom truss is fixed on the ground.

[0010] Install temporary supports: Based on the length and installation position of the three assembled segments and the top truss, install the first temporary support, the second temporary support, and the third temporary support in the construction area, with the end of the top truss close to the construction area abutting against the first temporary support;

[0011] Install the high-suspension beam segment: fix the upper end of the high-suspension beam segment to the end of the top truss close to the construction area, and place the lower end of the high-suspension beam segment against the second temporary support;

[0012] Install the middle suspension beam segment: fix one end of the upper end of the middle suspension beam segment to the lower end of the high suspension beam segment, and place the lower end of the middle suspension beam segment against the third temporary support;

[0013] Install the low-hanging beam segment: Fix the lower end of the low-hanging beam segment to the upper end of the middle-hanging beam segment, and fix the lower end of the low-hanging beam segment to the end of the bottom truss close to the construction area;

[0014] Install purlins: Install several purlins vertically on the high-hanging beam segment, the middle-hanging beam segment and the low-hanging beam segment to connect several arranged steel structures into a whole;

[0015] Cancel temporary support: After the purlin is installed, remove the first temporary support, the second temporary support and the third temporary support.

[0016] Furthermore, the specific steps for constructing the top truss are:

[0017] First, the concrete stand is poured, and steel embedded parts are embedded inside the concrete stand. Then, the support is fixedly connected to the concrete stand through the steel embedded parts, and finally, the top truss is fixedly installed on the support.

[0018] Further, the specific steps for installing purlins are:

[0019] A plurality of purlin supports are arranged on the upper surfaces of a plurality of high-suspension beam segments, a middle-suspension beam segments and a low-suspension beam segments, and a plurality of purlins are fixed on the purlin supports respectively, so that a grid structure system is formed between the plurality of purlins and the plurality of steel structures.

[0020] Furthermore, the upper ends of the first temporary support, the second temporary support and the third temporary support are all provided with a clamping limit assembly, the clamping limit assembly includes a connecting seat, a mounting shaft is provided in the middle of the connecting seat, one end of the mounting shaft is connected to the connecting seat, and the other end of the mounting shaft is provided with a support plate, the upper surface of the support plate is provided with a rectangular frame, two light rods are provided in parallel inside the rectangular frame, and splints are symmetrically provided on the two light rods, one end of the splint is slidably connected to the light rod, a sliding shaft is provided in the middle of the two light rods, one end of the sliding shaft is slidably connected to the inside of the mounting shaft, and a contact plate is provided on the other end of the sliding shaft, and a traction rope is symmetrically provided on the sliding shaft, one end of the traction rope is connected to the sliding shaft, and the other end of the traction rope is connected to the splint.

[0021] Furthermore, fixed rods are symmetrically provided on both sides of the sliding shaft, the two ends of the fixed plate are respectively fixed on the two light rods, a guide wheel is provided in the middle of the fixed rod, the traction rope is wound around the guide wheel, and a reset spring is provided between the two ends of the splint and the fixed rod, and the reset spring is sleeved on the light rod.

[0022] Furthermore, one end of the traction rope connected to the splint extends to the outside of the end of the rectangular frame, and an adjustment block is provided on the traction rope between the splint and the end of the rectangular frame, and a limit block is provided on the traction rope located outside the rectangular frame.

[0023] Furthermore, the end of the mounting shaft is rotatably connected to the connecting seat, the upper surface of the connecting seat is provided with a fixing plate, the fixing plate is symmetrically provided with a sliding rod, the lower end of the sliding rod is slidably connected to the fixing plate, the other end of the sliding rod is provided with a limiting plate, the middle part of the limiting plate is sleeved on the mounting shaft, the upper surface of the limiting plate is provided with a plurality of limiting grooves evenly distributed around the circumference, the lower surface of the supporting plate is provided with a plurality of limiting ridges evenly distributed around the circumference, the sliding rod is provided with a mounting plate, a tightening spring is provided between the mounting plate and the fixing plate, and the tightening spring is sleeved on the sliding rod.

[0024] Furthermore, an adjustment groove is provided at the portion where the limit plate is connected to the sliding rod, a connecting shaft is provided in the adjustment groove, the end of the sliding rod is slidably connected to the connecting shaft, a left adjustment plate and a right adjustment plate are respectively provided on both sides of the sliding rod, one end of the left adjustment plate and the right adjustment plate are slidably connected to the connecting shaft, a screw is provided at the upper end of the left adjustment plate and the right adjustment plate, nuts are symmetrically provided on the screw, and the two nuts are respectively arranged on the inner sides of the left adjustment plate and the right adjustment plate.

[0025] Furthermore, a fixing ring is provided below the fixing plate, the fixing ring is fixed on the connecting seat, and a limiting bolt is provided on the fixing plate, and the limiting bolt is threadedly connected to the fixing ring.

[0026] The beneficial effects of the present invention are:

[0027] By adopting the above technical solution, the large-span suspended steel structure is divided into high-span, middle-span and low-span sections and installed separately, and multiple temporary supports are used to support the cantilever beam vertically and laterally to ensure that the cantilever beam is in a safe and stable state during the installation process, thereby improving the construction effect. At the same time, the two ends of the steel structure are fixed to the top truss and the bottom truss respectively, and the weight of the steel structure and the upper load is effectively transferred to the trusses at both ends and the lower foundation, so that the mid-span and lower part of the steel structure do not need to be installed with a support column structure, thereby ensuring the building's usable space and improving construction efficiency.

[0028] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0030] Figure 1 It is a schematic diagram of the construction plan of the large-span cantilever steel structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the connection between the top truss and the concrete stand in the present invention;

[0032] Figure 3 This is a schematic diagram of arranging purlins on a steel structure in the present invention;

[0033] Figure 4 It is a three-dimensional schematic diagram of the clamping and limiting assembly in the present invention;

[0034] Figure 5 It is a schematic cross-sectional view of the clamping and limiting assembly of the present invention;

[0035] Figure 6 It is a three-dimensional schematic diagram of the lower structure of the clamping and limiting assembly in the present invention;

[0036] Figure 7 It is a schematic cross-sectional view of the adjustment groove in the clamping and limiting assembly of the present invention;

[0037] Figure 8 It is a partial three-dimensional schematic diagram of the position of the slide bar in the present invention;

[0038] Figure 9 It is a three-dimensional schematic diagram of the upper structure of the clamping and limiting assembly in the present invention.

[0039] The following are marked in the accompanying drawings:

[0040] 1. First temporary support; 2. Second temporary support; 3. Third temporary support; 4. Bottom truss; 5. Top truss; 6. Concrete stand; 7. High-hanging beam segment; 8. Middle-hanging beam segment; 9. Low-hanging beam segment; 10. Purlin; 11. Embedded steel parts; 12. Support; 13. Connecting seat; 14. Mounting shaft; 15. Support plate; 16. Limiting ridge; 17. Limiting plate; 18. Limiting groove; 19. Fixing plate; 20. Sliding rod; 21. Mounting plate; 22. Tightening spring Spring; 23. Connecting shaft; 24. Left adjustment plate; 25. Right adjustment plate; 26. Left limit column; 27. Right limit column; 28. Adjustment slot; 29. ​​Screw; 30. Nut; 31. Limit bolt; 32. Fixing ring; 33. Rectangular frame; 34. Rib; 35. Polish rod; 36. Clamp; 37. Sliding shaft; 38. Contact plate; 39. Fixed rod; 40. Guide wheel; 41. Traction rope; 42. Return spring; 43. Adjustment block; 44. Limit block. DETAILED DESCRIPTION

[0041] like Figures 1 to 9 As shown, the construction method of a large-span suspended steel structure of the present invention includes the following construction steps:

[0042] Prefabricated steel structure: According to the required length of the steel structure, one steel structure is prepared into three assembled segments, wherein the three assembled segments are respectively a high overhang beam segment 7, a middle overhang beam segment 8 and a low overhang beam segment 9;

[0043] Construction of end trusses: According to the length and position of the steel structure, the top truss 5 and the bottom truss 4 are constructed at both ends of the steel structure respectively. The top truss 5 is fixed on the concrete stand 6, and the bottom truss 4 is fixed on the ground.

[0044] Install temporary supports: Based on the length and installation position of the three assembled segments and the top truss 5, install the first temporary support 1, the second temporary support 2, and the third temporary support 3 in the construction area, wherein the end of the top truss 5 close to the construction area abuts against the first temporary support 1;

[0045] Install the high-suspension beam segment 7: fix the upper end of the high-suspension beam segment 7 to the end of the top truss 5 close to the construction area, and abut the lower end of the high-suspension beam segment 7 against the second temporary support 2;

[0046] Install the middle suspension beam segment 8: fix one end of the upper end of the middle suspension beam segment 8 to the lower end of the high suspension beam segment 7, and place the lower end of the middle suspension beam segment 8 against the third temporary support 3;

[0047] Install the low-hanging beam segment 9: Fix the lower end of the low-hanging beam segment 9 to the upper end of the middle-hanging beam segment 8, and fix the lower end of the low-hanging beam segment 9 to the end of the bottom truss 4 close to the construction area;

[0048] Installing purlins 10: vertically install several purlins 10 on the high suspension beam segment 7, the middle suspension beam segment 8 and the low suspension beam segment 9 to connect the several arranged steel structures into a whole;

[0049] Remove temporary supports: After the purlin 10 is installed, remove the first temporary support 1, the second temporary support 2, and the third temporary support 3. Removing and removing the first temporary support 1 also removes and removes the second and third temporary supports, reducing the secondary stress generated during the unloading process of the cantilever beam, allowing the cantilever beam to settle as a whole under its own weight.

[0050] By adopting the above technical solution, the long-span overhanging steel structure is divided into high-span, mid-span, and low-span sections for separate installation. Multiple temporary supports are used to provide vertical and lateral support for the cantilever beams, ensuring that the cantilever beams are in a safe and stable state during installation. Since the length of the overhanging steel structure is much greater than the cross-sectional height of the cantilever beam, the cantilever beam axis adopts a curved shape, which reduces the internal stress of the cantilever beam during construction and use, effectively reducing the overall weight of the steel structure and minimizing installation risks. The two ends of the steel structure are respectively fixed to the top truss 5 and the bottom truss 4, effectively transferring the weight of the steel structure and the upper load to the two end trusses and the lower foundation, eliminating the need to install a support column structure below the mid-span of the steel structure, ensuring the building's usable space and improving construction efficiency.

[0051] In one practicable manner, the specific steps for constructing the top truss 5 are:

[0052] First, the concrete stand 6 is poured, and steel embedded parts 11 are embedded in the concrete stand 6. Then, the support 12 is fixed to the concrete stand 6 through the steel embedded parts 11. Finally, the top truss 5 is fixed to the support 12. This method can ensure the stability of the connection between the top truss 5 and the lower concrete structure.

[0053] In one practicable manner, the specific steps of installing the purlin 10 are:

[0054] A plurality of purlin 10 supports 12 are provided on the upper surfaces of the plurality of high suspension beam segments 7, the middle suspension beam segments 8 and the low suspension beam segments 9. The plurality of purlins 10 are fixed to the purlin 10 supports 12 respectively, so that a grid structure system is formed between the plurality of purlins 10 and the plurality of steel structures. This method improves the construction efficiency and safety of the steel structure.

[0055] In one practicable manner, the first temporary support 1, the second temporary support 2 and the third temporary support 3 all include a support frame (which can be raised and lowered by hydraulic pressure to match different support heights), and a clamping limit assembly arranged at the upper end of the support frame, the clamping limit assembly including a connecting seat 13, the connecting seat 13 is fixed to the end of the support frame, a mounting shaft 14 is provided in the middle of the connecting seat 13, one end of the mounting shaft 14 is connected to the connecting seat 13, and a support plate 15 is provided on the other end of the mounting shaft 14, and a rectangular frame 33 is provided on the upper surface of the support plate 15, and the rectangular frame 33 is fixed to the support plate through a rib 34 15, two polished rods 35 are provided in parallel inside the rectangular frame 33, and splints 36 are symmetrically provided on the two polished rods 35, one end of the splint 36 is slidably connected to the polished rod 35, and a sliding shaft 37 is provided in the middle of the two polished rods 35, one end of the sliding shaft 37 is slidably connected to the inside of the mounting shaft 14 (a through hole is provided inside the mounting shaft 14, and the sliding shaft 37 is slidably set in the through hole), a contact plate 38 is provided on the other end of the sliding shaft 37, and a traction rope 41 is symmetrically provided on the sliding shaft 37, one end of the traction rope 41 is connected to the sliding shaft 37, and the other end of the traction rope 41 is connected to the splint 36.

[0056] Taking the second temporary support 2 supporting the end of the high-hanging beam segment 7 as an example, the working principle of the above technical solution is:

[0057] When the high-suspension beam segment 7 is hoisted and placed on the second temporary support 2, under the action of the high-suspension beam segment 7's own gravity, it will press the contact plate 38 downward, thereby driving the sliding shaft 37 to move downward, thereby driving the traction rope 41 to move, and then pulling the splint 36 to slide on the light rod 35 until the splint 36 contacts the side of the high-suspension beam segment 7. That is, this setting method can rely on the gravity of the high-suspension beam segment 7 itself as a driving force to enable the splint 36 to support and limit the side of the high-suspension beam segment 7, so as to ensure the stability of the high-suspension beam segment 7 under the action of vibration or wind pressure during construction.

[0058] In one practicable embodiment, fixed rods 39 are symmetrically provided on both sides of the sliding shaft 37, the two ends of the fixed plate 19 are respectively fixed to the two polished rods 35, a guide wheel 40 is provided in the middle of the fixed rod 39, a traction rope 41 is wound around the guide wheel 40, and a return spring 42 is provided between the clamping plate 36 and the two ends of the fixed rod 39, and the return spring 42 is sleeved on the polished rod 35. The provision of the guide wheel 40 can keep the portion of the traction rope 41 between the guide wheel 40 and the clamping plate 36 parallel and centered, thereby ensuring the force transmission effect of the traction rope 41, and further improving the effect of the traction rope 41 in driving the clamping plate 36 to move on the polished rod 35. The benefit of the return spring 42 is that it ensures that the two clamping plates 36 are in an "open" state under normal conditions, making it easier for a high-hanging beam to enter between the two clamping plates 36.

[0059] In one practicable embodiment, one end of the traction rope 41 connected to the splint 36 extends to the outside of the end of the rectangular frame 33, and an adjustment block 43 is provided on the traction rope 41 between the splint 36 and the end of the rectangular frame 33, and a limit block 44 is provided on the traction rope 41 located outside the rectangular frame 33.

[0060] It is not difficult to understand that if the sliding distance of the sliding shaft 37 is fixed, then high-hanging beam segments 7 of different widths require the splint 36 to move horizontally by different distances to achieve the clamping operation. The moving distance of the splint 36 on the light rod 35 can be changed by adjusting the adjusting block 43. Specifically, when the traction rope 41 moves, it will drive the adjusting block 43 to move, and the movement of the adjusting block 43 will push the splint 36 to move. Therefore, changing the position of the adjusting block 43 on the traction rope 41 can change the horizontal movement distance of the splint 36. The setting of the limit block 44 can block the end of the traction rope 41 to prevent it from sliding into the rectangular frame 33, causing inconvenience for workers to adjust. Of course, the adjusting block 43 and the limit block 44 can both be structures such as clamps to facilitate locking and disassembly. Of course, it is not easy to understand that the lateral movement of the clamping plate 36 after clamping is also blocked by the adjustment block 43, thereby limiting the lateral movement of the high suspension beam segment 7. Of course, if necessary, a pad or the like can be set between the clamping plate 36 and the end of the rectangular frame 33 to further block the backward movement of the clamping plate 36 in the clamped state.

[0061] In one feasible manner, the end of the mounting shaft 14 is rotatably connected to the connecting seat 13, and a fixing plate 19 is provided on the upper surface of the connecting seat 13. A sliding rod 20 is symmetrically provided on the fixing plate 19, and the lower end of the sliding rod 20 is slidably connected to the fixing plate 19. A limiting plate 17 is provided on the other end of the sliding rod 20. The middle part of the limiting plate 17 is sleeved on the mounting shaft 14. A plurality of limiting grooves 18 are evenly distributed around the circumference of the upper surface of the limiting plate 17, and a plurality of limiting ridges 16 are evenly distributed around the circumference of the lower surface of the support plate 15. A mounting plate 21 is provided on the sliding rod 20, and a tightening spring 22 is provided between the mounting plate 21 and the fixing plate 19. The tightening spring 22 is sleeved on the sliding rod 20.

[0062] The advantage of this setting method is that after the second temporary support 2 is fixed to the ground, installation errors are prone to occur. The installation errors include distance errors and angle errors. The distance error refers to that the end installation position of the high-suspension beam segment 7 is not between the two clamping plates 36. At this time, the position of the adjustment block 43 on the traction rope 41 can be changed, and the two clamping plates 36 can be moved to different distances to clamp the two sides of the high-suspension beam segment 7; and the angle error refers to that the side surface of the high-suspension beam segment 7 is not parallel to the surface of the clamping plate 36, which leads to a small contact area during clamping and unstable clamping. At this time, the clamping plate 36 can be driven to rotate by rotating the support plate 15, and then the angle can be adjusted. After the adjustment is completed, it is only necessary to loosen the clamping spring 22, that is, the clamping spring 22 drives the limit plate 17 to move upward, so that the limit groove 18 and the limit ridge 16 are matched one by one, and the rotation of the support plate 15 can be restricted, thereby avoiding rotation during construction. That is, this arrangement, in conjunction with the function of the adjustment block 43, can adjust the horizontal error and angular error of the clamping and limiting assembly at the temporary support end, thereby ensuring the limiting and supporting effect on the steel structure.

[0063] In one feasible manner, an adjustment groove 28 is provided at the portion where the limit plate 17 is connected to the slide rod 20, and a connecting shaft 23 (which can be arc-shaped) is provided in the adjustment groove 28, and the end of the slide rod 20 is slidably connected to the connecting shaft 23, that is, a hole slightly larger than the connecting shaft 23 is opened on the slide rod 20 (or a hole with an arc-shaped axis can be provided in the wall thickness of the slide rod 20, that is, the connecting shaft 23 can move in the slide rod 20 when it rotates), and a left adjustment plate 24 and a right adjustment plate 25 are respectively provided on both sides of the slide rod 20, and one end of the left adjustment plate 24 and the right adjustment plate 25 are slidably connected to the connecting shaft 23, and a screw 29 is provided at the upper end of the left adjustment plate 24 and the right adjustment plate 25, and a nut 30 is symmetrically provided on the screw 29, and the two nuts 30 are respectively arranged on the inner sides of the left adjustment plate 24 and the right adjustment plate 25.

[0064] It is not difficult to understand that, through the interlocking and limiting method of the limiting groove 18 and the limiting ridge 16, there is an angle range that cannot be engaged (the range is very small, determined by the setting angle between adjacent limiting grooves 18 or ridges), that is, the limiting groove 18 and the limiting ridge 16 are not aligned; that is, at this time, it is only necessary to rotate the limiting plate 17 so that the limiting plate 17 rotates a very small angle to achieve the alignment angle adjustment. After the adjustment is completed, the position of the sliding rod 20 on the connecting shaft 23 is no longer in the middle, but has slid a certain distance, that is, it is only necessary to adjust the nut 30 and press the left adjustment plate 24 and the right adjustment plate 25 against the inner wall of the end of the adjustment groove 28 to limit the movement of the limiting plate 17 on the connecting shaft 23, thereby avoiding the movement of the limiting plate 17 during construction.

[0065] Preferably, a left limit column 26 and a right limit column 27 are respectively provided on the left adjustment plate 24 and the right adjustment plate 25. One end of the left limit column 26 and the right limit column 27 are slidably connected to the slide rod 20. The setting of the limit column, combined with the action of the connecting shaft 23, can prevent the left adjustment plate 24 and the right adjustment plate 25 from rotating themselves in the adjustment slot 28.

[0066] In one feasible manner, a fixing ring 32 is provided under the fixing plate 19, and the fixing ring 32 is fixed to the connecting seat 13. A limiting bolt 31 is provided on the fixing plate 19, and the limiting bolt 31 is threadedly connected to the fixing ring 32. When the limiting bolt 31 is rotated downward, the limiting plate 17 can be driven to separate from the support plate 15, and there is no need to manually limit the position of the limiting plate 17, so that the support plate 15 can be easily adjusted in angle. After the adjustment is completed, the end of the limiting bolt 31 is unscrewed from the fixing ring 32, that is, it is separated from the fixing ring 32, and then the limiting plate 17 can be driven to reset under the action of the tightening spring 22.

[0067] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A construction method for a large-span suspended steel structure, characterized by: The construction steps include: Prefabricated steel structure: According to the required length of the steel structure, one steel structure is prepared into three assembled segments, wherein the three assembled segments are respectively a high overhang beam segment, a middle overhang beam segment and a low overhang beam segment; Construction of end trusses: According to the length and position of the steel structure, the top truss and bottom truss are constructed at both ends of the steel structure respectively. The top truss is fixed on the concrete stand, and the bottom truss is fixed on the ground. Install temporary supports: Based on the length and installation position of the three assembled segments and the top truss, install the first temporary support, the second temporary support, and the third temporary support in the construction area, with the end of the top truss close to the construction area abutting against the first temporary support; Install the high-suspension beam segment: fix the upper end of the high-suspension beam segment to the end of the top truss close to the construction area, and place the lower end of the high-suspension beam segment against the second temporary support; Install the middle suspension beam segment: fix one end of the upper end of the middle suspension beam segment to the lower end of the high suspension beam segment, and place the lower end of the middle suspension beam segment against the third temporary support; Install the low-hanging beam segment: Fix the lower end of the low-hanging beam segment to the upper end of the middle-hanging beam segment, and fix the lower end of the low-hanging beam segment to the end of the bottom truss close to the construction area; Install purlins: Install several purlins vertically on the high-hanging beam segment, the middle-hanging beam segment and the low-hanging beam segment to connect several arranged steel structures into a whole; Cancel temporary support: After the purlin is installed, remove the first temporary support, the second temporary support and the third temporary support.

2. The construction method of a large-span suspended steel structure according to claim 1, characterized in that: The specific steps for constructing the top truss are: First, the concrete stand is poured, and steel embedded parts are embedded inside the concrete stand. Then, the support is fixedly connected to the concrete stand through the steel embedded parts, and finally, the top truss is fixedly installed on the support.

3. The construction method of a large-span suspended steel structure according to claim 1, characterized in that: The specific steps for installing purlins are: A plurality of purlin supports are arranged on the upper surfaces of a plurality of high-suspension beam segments, a middle-suspension beam segments and a low-suspension beam segments, and a plurality of purlins are fixed on the purlin supports respectively, so that a grid structure system is formed between the plurality of purlins and the plurality of steel structures.

4. The construction method of a large-span suspended steel structure according to claim 1, characterized in that: The upper ends of the first temporary support, the second temporary support and the third temporary support are all provided with a clamping limit assembly, the clamping limit assembly includes a connecting seat, a mounting shaft is provided in the middle of the connecting seat, one end of the mounting shaft is connected to the connecting seat, and the other end of the mounting shaft is provided with a support plate, the upper surface of the support plate is provided with a rectangular frame, two light rods are provided in parallel inside the rectangular frame, and splints are symmetrically provided on the two light rods, one end of the splint is slidably connected to the light rod, a sliding shaft is provided in the middle of the two light rods, one end of the sliding shaft is slidably connected to the inside of the mounting shaft, and a contact plate is provided on the other end of the sliding shaft, and a traction rope is symmetrically provided on the sliding shaft, one end of the traction rope is connected to the sliding shaft, and the other end of the traction rope is connected to the splint.

5. The construction method of a large-span suspended steel structure according to claim 4, characterized in that: Fixed rods are symmetrically provided on both sides of the sliding shaft, the two ends of the fixed plate are respectively fixed on the two light rods, a guide wheel is provided in the middle of the fixed rod, the traction rope is wound around the guide wheel, and a return spring is provided between the two ends of the splint and the fixed rod, and the return spring is sleeved on the light rod.

6. The construction method of a large-span suspended steel structure according to claim 4, characterized in that: One end of the traction rope connected to the splint extends to the outside of the end of the rectangular frame, and an adjustment block is provided on the traction rope between the splint and the end of the rectangular frame, and a limit block is provided on the traction rope outside the rectangular frame.

7. The construction method of a large-span suspended steel structure according to claim 4, characterized in that: The end portion of the mounting shaft is rotatably connected to the connecting seat, the upper surface of the connecting seat is provided with a fixing plate, the fixing plate is symmetrically provided with a sliding rod, the lower end of the sliding rod is slidably connected to the fixing plate, the other end of the sliding rod is provided with a limiting plate, the middle portion of the limiting plate is sleeved on the mounting shaft, the upper surface of the limiting plate is provided with a plurality of limiting grooves evenly distributed around the circumference, the lower surface of the supporting plate is provided with a plurality of limiting ridges evenly distributed around the circumference, the sliding rod is provided with a mounting plate, a tightening spring is provided between the mounting plate and the fixing plate, and the tightening spring is sleeved on the sliding rod.

8. The construction method of a large-span suspended steel structure according to claim 7, characterized in that: An adjustment slot is provided at the portion where the limit plate is connected to the sliding rod, and a connecting shaft is provided in the adjusting slot, and the end of the sliding rod is slidably connected to the connecting shaft. A left adjustment plate and a right adjustment plate are respectively provided on both sides of the sliding rod, and one end of the left adjustment plate and the right adjustment plate are slidably connected to the connecting shaft. Screws are provided at the upper ends of the left adjustment plate and the right adjustment plate, and nuts are symmetrically provided on the screws, and the two nuts are respectively arranged on the inner sides of the left adjustment plate and the right adjustment plate.

9. The construction method of a large-span suspended steel structure according to claim 7, characterized in that: A fixing ring is provided below the fixing plate, and the fixing ring is fixed on the connecting seat. A limiting bolt is provided on the fixing plate, and the limiting bolt is threadedly connected to the fixing ring.

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