Large-span stadium steel structure and construction process thereof

Abstract

The present application relates to a kind of large-span venue steel structures, it is characterized in that: including standard exhibition hall and login hall;The standard exhibition hall has a pair, the login hall presents T-shaped structure, and standard exhibition hall is respectively arranged at the two sides of login hall, and standard exhibition hall is symmetrically arranged about login hall;Net shell structure optimization presents hub node, processing technology is simple, and can realize factory batch manufacturing, compared with the net shell structure formed by welding node, this method makes the appearance processing difficulty of net shell greatly reduced;In addition, net shell rod piece is welded with hub node, positioning is simple, more conducive to control structure overall quality and linear control;Design special hoisting structure, select appropriate lifting point, give hoisting data support theoretically;Using specially designed jig, reduce hoisting installation risk, while solving hoisting precision control problem;The above improvement point guarantees the installation of hoisting, and the profile contour of structure assembly meets design requirement, reduces rework frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-span venue construction process, and particularly relates to a large-span venue steel structure and a construction process thereof. BACKGROUND

[0002] With the frequent appearance of various steel structure roofs and the continuous improvement of quality, cost and cycle requirements, higher demands are put forward for the manufacturing and installation process. Based on the continuous improvement of the requirements of buildings, the requirements of building shapes are also higher and higher, which not only meet the basic needs, but also meet the visual and artistic requirements, such as Sydney Opera House, Guangzhou Grand Theatre, various stadiums, exhibition centers and the like. However, the development of buildings is limited by structures, and the research direction is changed from the original plane structure system to various space structure systems, so the latticed shell structure emerges as the times require. The latticed shell structure has the characteristics of both bar structure and thin shell structure, is reasonable in stress, beautiful in shape, large in covering span, which is not only a breakthrough in technology, but also an artistic performance of technology, is the space structure with the fastest development in the past half century and has a broad development prospect, and is widely applied at home and abroad.

[0003] Only reasonable construction scheme and scientific construction process analysis can guarantee the safety and economy of the structure. The safety of the construction hoisting process of the large-span steel structure and whether the forming shape meets the design requirements are problems that must be solved. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a large-span venue steel structure and a construction process thereof, which can solve the problems of hidden dangers in the hoisting process safety of general large-span venue steel structures and the need for multiple adjustments of the forming shape.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows: a large-span venue steel structure, which has the following innovative points: including a standard exhibition hall and a registration hall; the standard exhibition hall is provided in pairs, the registration hall has a T-shaped structure, and the standard exhibition halls are arranged on both sides of the registration hall in a symmetrical manner about the registration hall;

[0006] The standard exhibition hall comprises inverted triangular main trusses, inverted triangular secondary trusses, edge sealing single trusses, exhibition steel columns and connecting steel beams; the exhibition steel columns are arranged in a matrix on the ground; the connecting steel beams are arranged horizontally and connected between the exhibition steel columns; the inverted triangular main trusses and the inverted triangular secondary trusses are arranged on the top of the steel columns to form a cuboid frame structure; and the edge sealing single trusses are arranged between adjacent exhibition steel columns.

[0007] The registration hall comprises a middle corridor and an overhanging section, and the overhanging section is arranged at the end of the middle corridor to form a T-shaped structure; the registration hall comprises a first layer of steel beams, a second layer of steel beams, registration hall steel columns and a top net shell; the registration hall steel columns are vertically arranged in a matrix on the ground, and the registration hall steel columns are located between two standard exhibition halls, the top end of the registration hall steel columns is provided with a basement beam plate, and a first layer of steel columns is arranged above the basement beam plate; the first layer of steel beams is arranged at the top end of the first layer of steel columns, the second layer of steel columns is arranged on the first layer of steel beams, and the second layer of steel beams is horizontally arranged on the top end of the second layer of steel columns; the top net shell has a semi-elliptical structure and is buckled on the second layer of steel beams.

[0008] A large-span venue steel structure construction process, the innovation lies in: including standard exhibition hall construction and registration hall construction; the specific construction process is as follows:

[0009] S1: pre-embedded part installation: according to the pre-embedded part layout, measure and lay out the pre-embedded part; when the foundation bottom plate starts construction, start pre-embedded part lofting work; if errors are found in the template construction size during lofting, timely propose and require rectification; the pre-embedded part is connected with the main concrete structure through anchor bars, and the anchor bars of the embedded part must be firmly spot-welded and tied with the main steel bars; the allowable error of the embedded part is strictly controlled, that is, the support surface elevation is ≤±3mm, and the center offset of the anchor bolt horizontal position is ≤5mm;

[0010] S2: installation of steel columns: different hoisting machinery is selected according to the weight of the steel columns; when the steel columns are hoisted, the crane is positioned on the inside of the venue and hoisted near the steel column position; when the basement steel columns are hoisted, the crane travels on the basement roof;

[0011] S3: installation of steel beams: single-span hoisting is adopted, and multiple points are bound for hoisting points; soft material is used to pad the binding points to prevent damage to the steel components; when hoisting, the steel beam is first hoisted about 50cm away from the ground, the center of the steel beam is aligned with the center of the installation position, then the hook is slowly lifted, the steel beam is rotated to adjust the position by using the sliding rope, so that the hook is in place, the bolt is inserted into the hole, and the bolt is initially screwed as temporary fixation, and at the same time, the verticality correction and final fixation are carried out; after the steel beam is corrected, the bolt is finally screwed for final fixation;

[0012] S4: installation of the registration hall: the registration hall steel columns of the basement are installed, and the basement beam plate is laid on the top end of the registration hall steel columns; the car hoist is parked on the basement roof, a first layer of steel columns is arranged above the basement roof, and a first layer of steel beams is hoisted, then a second layer of steel columns is hoisted on the first layer of steel beams, and then a second layer of steel beams and trusses are hoisted on the second layer of steel columns; the full-frame scaffold is erected after the first floor slab of the middle corridor is poured and constructed, and the trusses between the second layer of steel columns are continuously installed; then the net shell is hoisted on the top end of the second layer of steel beams, and the remaining second layer of steel beams and the outer trusses are hoisted;

[0013] S5: Installation of the Standard Exhibition Hall: The steel columns of the exhibition hall are hoisted from both sides, and the connecting steel beams between the columns are installed to form a unified structure. Then, the individual trusses between the columns are hoisted. The steel columns, beams, and individual trusses are then hoisted sequentially to form a longitudinal outer frame structure at the standard exhibition hall installation location. A temporary support frame for the main trusses is then installed within this longitudinal outer frame structure. The main trusses and their closure sections are then hoisted sequentially. Adjacent main trusses are then hoisted sequentially, and the secondary trusses between the two main trusses are installed to form a unified structure. Finally, the main and secondary trusses, roof connecting beams, and roof structure are hoisted sequentially to complete the installation of the standard exhibition hall.

[0014] Furthermore, in S2, the lifting point is set at the pre-welded connecting lug plate; to prevent deformation of the lifting lug during lifting, a special lifting clamp is used, and a single-machine rotation method is adopted for lifting; before lifting, the steel column should be padded with sleepers to avoid contact between the column base and the ground during lifting, and the column end should not be dragged on the ground during lifting; use the lifting holes on the column end lug plate to insert the retaining ring for fixation, and then lift and test the machine. It is required to lift slowly, and stop lifting when the base of the steel column is 200mm off the ground. Check the wire rope, sling, and clamp, and only after confirming that all aspects are safe and reliable can the formal lifting be carried out.

[0015] Furthermore, in S5, a temporary support frame needs to be erected during truss installation, and the temporary support must ensure the overall stability after its erection. Rigid supports and guy ropes are used to stabilize and reinforce the temporary support. The coordinate positioning dimensions of the positioning frame template at the top of the temporary support must be guaranteed, and precise positioning is performed using a total station.

[0016] Furthermore, in S4, the reticulated shell is pre-assembled using a segmented approach. First, based on the detailed drawings and considering the arching requirements of the components, while reserving for welding shrinkage, a horizontal projection line of the reticulated shell is drawn on the roadbed plate plane. Then, the location of the node is selected to place the jig. After the jig is set up, the rods in the width direction of the reticulated shell are positioned with the jig. When positioning the reticulated shell, attention is paid to the edge difference and bevel gap, and the interface is fixed with a connecting plate. After assembly, it is submitted to a dedicated inspector for inspection. After the overall inspection of the reticulated shell is completed, the two pieces of the reticulated shell are welded together as a group, and the width direction is divided into three segments, with the middle section serving as a patch.

[0017] Furthermore, in S5, the single-piece truss is assembled. First, a jig is set up. When setting up the jig, X and Y projection lines, elevation lines, inspection lines, and support point positions should be laid out on the concrete pavement according to the coordinates, and submitted for acceptance. It can only be used after passing the acceptance. After the jig is set up, the factory-made upper and lower chords are hoisted onto the jig for positioning and assembly. During positioning, the center line of the platform must be correctly determined. After meeting the requirements, temporary positioning plates are used for fixing. After the upper and lower chords are positioned, the web members are installed. During positioning, the center line of the platform must be correctly determined, and the assembly is checked. After confirming that the bevel gap and plate edge difference at the opening are correct, submit for inspection and acceptance, and make an assembly record; welding, flaw detection and post-weld correction inspection, after assembly and positioning, after passing the inspection, welding is carried out, using an even number of welders for symmetrical welding, using CO2 gas shielded welding, and welding should be completed continuously in one go, and then flaw detection is carried out as required, and then the positioning plate is removed to put the hoisting unit in a free state. Then, the hoisting unit after assembly and welding is fully inspected using total station measurement technology, and necessary corrections should be made for any non-compliance or out-of-tolerance parts to meet the assembly accuracy required for hoisting.

[0018] Furthermore, both the inverted triangular main truss and the inverted triangular secondary truss are fabricated using an assembly method. First, a jig is set up. When setting up the jig, X and Y projection lines, elevation lines, inspection lines, and support point positions should be laid out on the concrete ground according to the coordinates. This should be submitted for acceptance, and the jig can only be used after passing the acceptance inspection. After the assembly jig is set up, the factory-made upper and lower chords are hoisted onto the jig in sections for positioning and assembly. During positioning, the center line and section position lines on the platform must be correctly determined. The assembly alignment marks at the section joints, as well as the bevel gaps and plate edge differences at the section joints, are checked. Once the requirements are met, temporary positioning plates are used for fixing. The truss assembly adopts a side-assembly method, that is, the chords are located on the left and right sides of the assembly jig. The upper and lower chords... After the poles are positioned, the web members are installed. During positioning, the center line and segment position lines on the platform must be correctly determined. The bevel gap and plate edge difference at the assembly interface are checked. After confirming that there are no errors, the assembly is submitted for inspection and acceptance, and an assembly record is made. After the assembly and positioning are completed and the inspection is passed, welding is carried out. An even number of welders are used for symmetrical welding. CO2 gas shielded welding is used for welding. Welding should be completed continuously in one go. Then, flaw detection is carried out as required. After that, the positioning plate is removed, so that the hoisting unit is in a free state. Then, a total station measurement technology is used to conduct a comprehensive inspection of the assembled and welded hoisting unit. Any non-compliance or out-of-tolerance should be corrected as necessary to meet the assembly accuracy required for hoisting. After passing the inspection, the paint is repaired.

[0019] Furthermore, during the installation of the S4: login hall, the cantilever section needs to be installed simultaneously; first, install temporary columns and hoist the main beam; second, hoist the edge-sealing composite steel beam and secondary beam; then, hoist the second-floor steel columns; finally, hoist the second-floor edge-sealing box beam.

[0020] The advantages of this invention are:

[0021] 1) The optimized mesh shell structure of this invention features hub nodes, which simplify the manufacturing process and enable mass production in-house. Compared to mesh shell structures formed by welded nodes, this method significantly reduces the difficulty of surface treatment. Furthermore, the mesh shell members are welded to the hub nodes, simplifying positioning and facilitating better control of the overall structural quality and linearity. A specialized hoisting structure is designed, and appropriate hoisting points are selected, providing theoretical support for hoisting data. A specially designed jig is used to reduce hoisting and installation risks while addressing hoisting accuracy control issues. These improvements ensure the installability of the hoisting and that the structural assembly profile meets design requirements, reducing rework frequency. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of a large-span stadium steel structure entrance hall according to the present invention.

[0024] Figure 2 This is a schematic diagram of a standard exhibition hall for a large-span stadium steel structure according to the present invention.

[0025] Figures 3 to 9 This is a standard exhibition hall construction diagram illustrating a large-span stadium construction process according to the present invention.

[0026] Figures 10 to 16 This is a construction status diagram of the entrance hall for a large-span stadium construction process according to the present invention.

[0027] Figure 17 This is a construction diagram of the entrance hall grid shell, which is part of a large-span stadium construction process according to the present invention.

[0028] Figures 18 to 20 This is a construction diagram of an inverted triangular truss for a large-span stadium construction process according to the present invention.

[0029] Figure 21 This is a structural diagram of the temporary support frame for the main truss in a large-span stadium construction process according to the present invention.

[0030] Figure 22 This is a diagram showing the hoisting process of a large-span stadium construction method according to the present invention.

[0031] Figure 23 This is a scaffolding structure diagram for the construction of a large-span stadium using a grid shell method, as described in this invention.

[0032] Figures 24 to 27 This is a construction diagram of the cantilever section in a large-span stadium construction process according to the present invention. Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] like Figure 1 Figure 2 The steel structure of a large-span stadium shown includes a standard exhibition hall 1 and an entrance hall 2; there is a pair of standard exhibition halls 1, the entrance hall 2 has a T-shaped structure, and the standard exhibition halls 1 are respectively set on both sides of the entrance hall 2, and the standard exhibition halls 1 are symmetrically arranged about the entrance hall 2;

[0036] Standard exhibition hall 1 includes an inverted triangular main truss, an inverted triangular secondary truss, a single-piece truss for edge sealing, exhibition hall steel columns, and connecting steel beams; the exhibition hall steel columns are set up in a matrix on the ground; the connecting steel beams are set horizontally to connect the steel columns of each exhibition hall; the inverted triangular main truss and the inverted triangular secondary truss are respectively set on the top of the steel columns to form a cuboid frame structure; the single-piece truss for edge sealing is set between adjacent exhibition hall steel columns;

[0037] The entrance hall 2 includes a central corridor 21 and a cantilever section 22, with the cantilever section 22 located at the end of the central corridor 21 to form a T-shaped structure. The entrance hall 2 includes a first-floor steel beam, a second-floor steel beam, entrance hall steel columns, and a top grid shell. The entrance hall steel columns are arranged vertically on the ground in a matrix, and the entrance hall steel columns are located between two standard exhibition halls. The top of the entrance hall steel columns is equipped with a basement beam slab, and a first-floor steel column is installed above the basement beam slab. The first-floor steel beam is located on top of the first-floor steel columns, and a second-floor steel column is installed on the first-floor steel beam, with the second-floor steel beam horizontally located on top of the second-floor steel columns. The top grid shell has a semi-elliptical structure and is fitted over the second-floor steel beam.

[0038] like Figures 3 to 23 A construction process for steel structures in large-span stadiums includes the construction of standard exhibition halls and entrance halls; the specific construction process is as follows:

[0039] S1: Embedded part installation: According to the embedded part layout drawing, measure and lay out the embedded parts; when the foundation slab construction begins, the embedded part layout work begins; if errors are found in the formwork construction dimensions during the layout, raise them in time and require rectification; the embedded parts are connected to the main concrete structure through anchor bars, and the anchor bars of the embedded parts must be spot welded and tied firmly to the main steel bars. The allowable error of the embedded parts is strictly controlled, that is, the elevation of the support surface ≤ ±3mm, and the center offset of the anchor bolts from the horizontal position ≤ 5mm;

[0040] S2: Steel Column Installation: Select different hoisting machinery according to the weight of the steel column. When hoisting the steel column, the crane should be positioned inside the venue, close to the steel column. When hoisting the steel column in the basement, the crane should travel on the basement ceiling, with the hoisting point set at the pre-welded connecting lugs. To prevent deformation of the lifting lugs during hoisting, use special hoisting clamps and a single-machine rotation method for hoisting. Before hoisting, sleepers should be placed on the steel column to prevent the bottom of the column from contacting the ground during hoisting. During hoisting, the column end should not be dragged on the ground. Use the hoisting holes on the end lugs to insert shackles for fixation, and then perform a trial hoisting. Hoisting should be done slowly. When the base of the steel column is 200mm off the ground, stop hoisting, check the wire rope, slings, and clamps, and only after confirming that everything is safe and reliable can the formal hoisting begin.

[0041] S3: Steel beam installation: Single-beam hoisting is used, with multiple binding points. Soft materials are placed at the binding points to prevent damage to the steel components. When hoisting, first lift the steel beam about 50cm off the ground, aligning the center of the steel beam with the center of the installation position. Then, slowly raise the hook and use a guide rope to rotate the steel beam to adjust its position so that the hook is in place. Insert the bolts into the holes and tighten them initially for temporary fixation. At the same time, perform verticality correction and final fixation. After the steel beam has been corrected, tighten the bolts for final fixation.

[0042] S4: Installation of the Entrance Hall: Install the steel columns for the entrance hall in the basement, and lay the basement beams and slabs on top of the steel columns; the truck crane is positioned on the basement roof slab, and a layer of steel columns is installed above the basement roof slab, followed by the hoisting of a layer of steel beams. Then, a second layer of steel columns is installed on the first layer of steel beams, and subsequently, a second layer of steel beams and trusses are installed on the second layer of steel columns; after the first floor slab of the central corridor is poured, full-span scaffolding is erected, and the installation of the trusses between the two layers of steel columns continues; then, the space shell is hoisted on top of the second layer of steel beams, and the remaining two layers of steel beams and outer trusses are installed; the space shell is pre-assembled using a segmented approach; firstly, Based on the detailed drawings and considering the arching requirements of the components, while also allowing for welding shrinkage, a horizontal projection line of the reticulated shell is drawn on the roadbed plate plane. Then, the locations of the nodes are selected to place the jig. After the jig is set up, the members in the width direction of the reticulated shell are hoisted and positioned relative to the jig. When positioning the reticulated shell, attention is paid to the edge difference and bevel gap, and the joints are fixed with connecting plates. After assembly, it is submitted to a dedicated inspector for inspection. After the overall inspection of the reticulated shell is completed, two pieces of the reticulated shell are welded together, dividing the width direction into three sections, with the middle section serving as a patch. During the installation of the entrance hall, the cantilever section needs to be installed simultaneously. Figures 23 to 26 As shown, first, temporary columns are installed and the main beam is hoisted; second, the edge-sealing composite steel beam and secondary beam are hoisted; then, the second-floor steel columns are hoisted; and finally, the second-floor edge-sealing box girder is hoisted.

[0043] S5: Installation of the Standard Exhibition Hall: The steel columns of the exhibition hall are hoisted from both sides, and the connecting steel beams between the columns are installed to form a unified structure. Then, the individual trusses between the columns are hoisted. The steel columns, beams, and individual trusses are then hoisted sequentially to form a longitudinal outer frame structure at the standard exhibition hall installation location. A temporary support frame for the main truss is then installed within this longitudinal outer frame structure. The main trusses and their closure sections are then hoisted sequentially. Adjacent main trusses are then hoisted sequentially, and the secondary trusses between the two main trusses are installed to form a unified structure. Finally, the main and secondary trusses, roof connecting beams, and roof structure are hoisted sequentially to complete the installation of the standard exhibition hall. Temporary support frames are required during truss installation, and these frames must ensure overall stability after installation. Rigid supports and guy ropes are used to reinforce the temporary supports. The coordinate positioning dimensions of the template at the top of the temporary supports must be accurate, using a total station for precise positioning.

[0044] The single-piece truss is assembled. First, a jig is set up. When setting up the jig, X and Y projection lines, elevation lines, inspection lines, and support point positions should be laid out on the concrete pavement according to coordinates. This should be submitted for acceptance, and the jig can only be used after passing the acceptance inspection. After the jig is set up, the factory-made upper and lower chords are hoisted onto the jig for positioning and assembly. During positioning, the center line of the platform must be accurately determined. After meeting the requirements, temporary positioning plates are used for fixing. After the upper and lower chords are positioned, the web members are installed. During positioning, the center line of the platform must be accurately determined, and the bevels at the assembly joints are checked. After confirming that the gaps and plate edge differences are correct, submit the assembly for inspection and acceptance, and make an assembly record. Welding, flaw detection, and post-weld correction and inspection: After assembly and positioning, and after passing the inspection, welding is carried out. An even number of welders are used for symmetrical welding. CO2 gas shielded welding is used for welding. Welding should be completed continuously in one go. Then, flaw detection is carried out as required. After that, the positioning plate is removed, so that the hoisting unit is in a free state. Then, the hoisting unit after assembly and welding is fully inspected using total station measurement technology. Any non-compliance or out-of-tolerance should be corrected as necessary to meet the assembly accuracy required for hoisting.

[0045] like Figures 18 to 20 As shown, both the inverted triangular main truss and the inverted triangular secondary truss are fabricated using an assembly method. First, a jig is set up. When setting up the jig, X and Y projection lines, elevation lines, inspection lines, and support point positions should be laid out on the concrete ground according to the coordinates. This should be submitted for acceptance, and the jig can only be used after passing the acceptance inspection. After the assembly jig is set up, the factory-made upper and lower chords are hoisted onto the jig in sections for positioning and assembly. During positioning, the center line and section position lines on the platform must be correctly determined. The assembly alignment marks at the section joints, as well as the bevel gaps and plate edge differences at the section joints, are checked. Once the requirements are met, temporary positioning plates are used for fixing. The truss assembly adopts a side-assembly method, that is, the chords are located on the left and right sides of the assembly jig. The upper and lower chords are fixed... After positioning, the web members are installed. During positioning, the center line and segment position lines on the platform must be correctly determined. The bevel gap and plate edge difference at the assembly interface are checked. After confirming that there are no errors, the assembly is submitted for inspection and acceptance, and an assembly record is made. After the assembly and positioning are completed and the inspection is qualified, welding is carried out. An even number of welders are used for symmetrical welding. CO2 gas shielded welding is used for welding. Welding should be completed continuously in one go. Then, flaw detection is carried out as required. After that, the positioning plate is removed, so that the hoisting unit is in a free state. Then, the hoisting unit after assembly and welding is fully inspected using total station measurement technology. Any non-compliance or out-of-tolerance should be corrected as necessary to meet the assembly accuracy required for hoisting. After passing the inspection, the paint is repaired.

[0046] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A long-span stadium steel structure, characterized in that: The standard exhibition hall and the registration hall are included; the standard exhibition hall has a pair, and the registration hall has a T-shaped structure, and the standard exhibition hall is arranged on both sides of the registration hall, and the standard exhibition hall is symmetrically arranged about the registration hall; The standard exhibition hall includes inverted triangular main trusses, inverted triangular secondary trusses, edge sealing single trusses, exhibition hall steel columns and connecting steel beams; the exhibition hall steel columns are arranged in a matrix on the ground; the connecting steel beams are horizontally arranged and connected between the exhibition hall steel columns; the inverted triangular main trusses and the inverted triangular secondary trusses are arranged on the top of the steel columns to form a cuboid frame structure; and the edge sealing single trusses are arranged between adjacent exhibition hall steel columns; The registration hall includes a central corridor and a cantilever section, and the cantilever section is arranged at the end of the central corridor to form a T-shaped structure; the registration hall includes a first layer of steel beams, a second layer of steel beams, registration hall steel columns and a top net shell; the registration hall steel columns are vertically arranged in a matrix on the ground, and the registration hall steel columns are located between the two standard exhibition halls, the top end of the registration hall steel column is provided with a basement beam plate, and a first layer of steel columns is arranged above the basement beam plate; the first layer of steel beams is arranged at the top of the first layer of steel columns, the second layer of steel columns is arranged on the first layer of steel beams, and the second layer of steel beams is horizontally arranged on the top of the second layer of steel columns; and the top net shell has a semi-elliptical structure and is buckled on the second layer of steel beams.

2. A construction process of a long-span stadium steel structure, characterized in that: The standard exhibition hall construction and the registration hall construction are included; the specific construction process is as follows: S1: pre-embedded part installation: according to the pre-embedded part layout, the pre-embedded part is measured and laid out; when the foundation bottom plate starts to be constructed, the pre-embedded part laying out work starts; if it is found that there is an error in the template construction size during laying out, it is timely proposed and required to be rectified; the pre-embedded part is connected with the main concrete structure through anchor bars, and the anchor bars of the embedded part must be firmly spot-welded and tied with the main reinforcement, and the allowable error of the embedded part is strictly controlled, that is, the support surface elevation is ≤±3mm, and the center offset horizontal position of the anchor bolt is ≤5mm; S2: installation of steel columns: different hoisting machines are selected according to the weight of the steel columns, the crane is positioned on the inside of the venue, and the steel columns are hoisted near the steel column position; when the basement steel columns are hoisted, the crane walks on the basement top plate; S3: installation of steel beams: single-span hoisting is adopted, and multiple points are bound for the hoisting point, and soft material is used to pad the points to prevent damage to the steel components; when hoisting, the steel beam is first hoisted about 50cm away from the ground, the center of the steel beam is aligned with the center of the installation position, then the hook is slowly lifted, the steel beam is rotated by a rope to adjust the position, so that the hook is in place, the bolt is inserted into the hole, and the bolt is initially screwed as temporary fixation, and at the same time, the verticality correction and final fixation are carried out; after the steel beam is corrected, the bolt is finally screwed for final fixation; S4: installation of the registration hall: the registration hall steel columns of the basement are installed, and the basement beam plate is laid on the top end of the registration hall steel columns; the automobile crane is parked on the basement top plate, a first layer of steel columns is arranged above the basement top plate, and a first layer of steel beams is hoisted, then a second layer of steel columns is hoisted on the first layer of steel beams, and then a second layer of steel beams and trusses are hoisted on the second layer of steel columns; the full-frame scaffold is erected after the first floor slab of the central corridor is constructed, and the trusses between the second layer of steel columns are continuously installed; then the net shell is hoisted on the top end of the second layer of steel beams, and the remaining second layer of steel beams and the outer trusses are hoisted. S5: installation of the standard exhibition hall: hoist the steel columns of the exhibition hall from both sides of the exhibition hall, install the connecting steel beams between the steel columns of the exhibition hall, so that the steel columns of the exhibition hall are connected into a whole; then hoist the single truss between the steel columns of the exhibition hall; continue to hoist the steel columns, the steel beams and the single truss in sequence, so as to form a longitudinal outer frame structure at the installation position of the standard exhibition hall; then install the main truss temporary support jig frame in the longitudinal outer frame structure; hoist the main truss and the main truss closing section in sequence, on the basis of which, hoist the adjacent main trusses in sequence, install the secondary truss between the two main trusses, so that the main trusses and the secondary truss are connected into a whole; finally, continue to hoist the main truss and the secondary truss, the roof connecting beam and the roof structure in sequence to complete the installation of the standard exhibition hall.

3. The construction process of a long-span stadium steel structure according to claim 2, characterized in that: The lifting points in S2 are arranged at the pre-welded connecting lug plates; in order to prevent deformation of the lifting lug when being lifted, a special lifting fixture is used, and a single machine rotation method is used for lifting; before lifting, the steel column should be padded with a sleeper to avoid contact between the column bottom and the ground during lifting, and the column end should not be dragged on the ground during lifting; the lifting hole on the lug plate at the end of the column is penetrated by a clamping ring for fixation, and then the lifting machine is tested; the lifting is required to be slow, and when the root of the steel column is separated from the ground by 200 mm, the lifting is stopped, the steel wire rope, lifting cable and fixture are checked, and the formal lifting can be carried out only after it is confirmed that all aspects are safe and reliable.

4. The construction process of a long-span stadium steel structure according to claim 2, characterized in that: In S5, a temporary support jig frame needs to be erected when the truss is installed, and the temporary support jig frame must ensure the overall stability after being erected, and the temporary support jig frame is stably reinforced by using rigid support and cable wind rope; the coordinate positioning size of the jig frame template on the top of the temporary support jig frame must be ensured, and a total station instrument is used for precise positioning.

5. The construction process of a long-span stadium steel structure according to claim 2, characterized in that: In S4, the latticed shell is pre-assembled according to the segmentation principle; first, according to the deepening drawing, the arching requirements of the components are combined, the welding shrinkage is reserved, the horizontal projection line of the latticed shell is drawn on the roadbed plate plane, and then the position of the node is selected and the jig frame is placed; after the jig frame is set, the members in the width direction of the latticed shell are hoisted and positioned with the jig frame; when the latticed shell is positioned, the plate edge difference and the gap of the bevel joint are paid attention to, and the connecting plate is used for fixation at the interface; after the assembly is completed, a full-time inspector is submitted for inspection; after the overall inspection of the latticed shell is completed, the two pieces of the latticed shell are welded as a group, and the width direction is divided into three sections, and the middle section is embedded.

6. The construction process of a long-span steel structure of a venue according to claim 2, characterized in that: In S5, the single truss is assembled in the form of assembly; first, the jig frame is set, and when the jig frame is set, the X and Y projection lines, the elevation line, the test line and the fulcrum position are laid out on the concrete road surface according to the coordinates, and the acceptance is submitted, and the jig frame can be used only after the acceptance is passed; after the assembly jig frame is set, the upper and lower chord bars made in the factory are hoisted and positioned on the jig frame for assembly, and the center line on the platform must be aligned during positioning, and the temporary positioning plate is used for fixation after meeting the requirements; after the upper and lower chord bars are positioned, the web bars are installed, and the center line on the platform must be aligned during positioning, the gap of the bevel joint and the plate edge difference at the assembly interface are checked, and the assembly record is completed after the assembly is confirmed to be correct. After the positioning and assembly, the welding is carried out after the inspection, the symmetric welding is carried out by double welders, the CO2 gas protection welding is adopted, the welding should be completed continuously at one time, then the flaw detection is carried out according to the requirements, then the positioning plate is removed, the hoisting unit is in the free state, then the overall detection is carried out on the hoisting unit after the assembly and welding by using the total station instrument measurement technology, the correction is carried out on the position which does not meet or exceeds the allowable error, so that the assembly precision required by the hoisting is met.

7. The long-span stadium steel structure according to claim 1, characterized in that: The inverted triangular main truss and the inverted triangular secondary truss are both made in the assembly mode, first, the jig is set, when the jig is set, the X and Y projection lines should be laid on the concrete ground according to the coordinates, the elevation line, the inspection line and the fulcrum position are laid, and the acceptance is submitted, and the jig can be used only after the acceptance is passed; after the assembly jig is set, the upper and lower chords made in the factory are hoisted on the jig for positioning and assembly, when the positioning is carried out, the center line and the segmented position line on the platform must be aligned, the assembly joint mark at the segmented interface, the gap of the bevel at the segmented interface and the plate edge difference are checked, and the temporary positioning plate is fixed after the requirements are met; the truss assembly adopts the side assembly mode, that is, the chords are located on the left and right sides of the assembly jig; after the upper and lower chords are positioned, the web is installed, when the positioning is carried out, the center line and the segmented position line on the platform must be aligned, the gap of the bevel at the assembly interface and the plate edge difference are checked, and the assembly record is made after the inspection and acceptance are submitted and no error is confirmed; after the positioning and assembly, the welding is carried out after the inspection, the symmetric welding is carried out by double welders, the CO2 gas protection welding is adopted, the welding should be completed continuously at one time, then the flaw detection is carried out according to the requirements, then the positioning plate is removed, the hoisting unit is in the free state, then the overall detection is carried out on the hoisting unit after the assembly and welding by using the total station instrument measurement technology, the correction is carried out on the position which does not meet or exceeds the allowable error, so that the assembly precision required by the hoisting is met; the paint is repaired after the acceptance.

8. The construction process of a long-span stadium steel structure according to claim 2, characterized in that: In the installation of the S4: the login hall, the overhanging section needs to be installed at the same time; first, the temporary column is installed, and the main beam is hoisted; second, the edge combined steel beam and the secondary beam are hoisted; then, the second layer steel column is hoisted; finally, the second layer edge box beam is hoisted.

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