Large-span venue steel structure and building process therefor

Abstract

The present invention relates to a large-span venue steel structure, which is characterized in that: the large-span venue steel structure comprises standard exhibition halls and an entrance hall; there are a pair of standard exhibition halls; the entrance hall presents a T-shaped structure, and the standard exhibition halls are arranged on both sides of the entrance hall respectively; and the standard exhibition halls are symmetrically arranged with respect to the entrance hall. A latticed shell structure is optimized to form hub joints, and a machining process is simple, so as to achieve batch production in a factory; compared with a latticed shell structure formed by weld joints, this method greatly reduces the appearance treatment difficulty of the latticed shell; in addition, latticed shell rod members and the hub joints are welded in an intersecting mode, such that positioning is simple, thus better facilitating control of the overall structure quality and linear control; a special hoisting structure is designed, and proper hoisting points are selected, thereby providing hoisting data support theoretically; using a specially designed jig reduces hoisting installation risks, and also solves the hoisting precision control problem; said improvement points ensure the hoisting installation performance, and an assembly profile contour of the structure meets design requirements, thereby reducing the rework frequency.

Description

A large-span stadium steel structure and its construction process Technical Field

[0001] The present invention relates to the technical field of large-span stadium construction technology, and in particular to a large-span stadium steel structure and a construction technology thereof. Background Art

[0002] With the frequent introduction of steel roof structures in diverse shapes and the increasing demands for quality, cost, and cycle time, higher demands are being placed on their manufacturing and installation processes. As architectural requirements continue to rise, so too are the demands for architectural form, which must meet both basic needs and visual and artistic requirements. Examples include the Sydney Opera House, the Guangzhou Opera House, various stadiums, and convention and exhibition centers. However, architectural development is constrained by structural constraints, and research has shifted from planar structural systems to various spatial structural systems. Consequently, the lattice shell structure emerged. Combining the characteristics of both rod-based and thin-shell structures, it offers rational load-bearing, beautiful shapes, and a wide span. This represents not only a technological breakthrough but also a manifestation of technological artistry. It is the fastest-growing spatial structure in half a century and holds a broad future, enjoying widespread application both domestically and internationally.

[0003] A reasonable construction plan and scientific construction process analysis can ensure the safety and economy of the structure. The safety of the hoisting process of large-span steel structure construction and whether the formed form meets the design requirements are issues that must be addressed.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a large-span stadium steel structure and its construction process, which can solve the problems of safety hazards in the hoisting process of general large-span stadium steel structures and the need for multiple adjustments to the formed shape.

[0006] To solve the above technical problems, the technical solution of the present invention is: a large-span venue steel structure, the innovation of which is that it includes a standard exhibition hall and a registration hall; the standard exhibition hall is a pair, the registration hall presents a T-shaped structure, and the standard exhibition halls are respectively arranged on both sides of the registration hall, and the standard exhibition halls are symmetrically arranged with respect to the registration hall;

[0007] The standard exhibition hall includes an inverted triangle main truss, an inverted triangle secondary truss, an edge-sealed monolithic truss, 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 arranged horizontally and connected between the exhibition hall steel columns; the inverted triangle main truss and the inverted triangle secondary truss are respectively arranged on the top of the steel columns to form a rectangular parallelepiped frame structure; the edge-sealed monolithic truss is arranged between adjacent exhibition hall steel columns;

[0008] The login hall includes a middle corridor and a cantilevered section, and the cantilevered section is arranged at the end of the middle corridor to form a T-shaped structure; the login hall includes a first-floor steel beam, a second-floor steel beam, a login hall steel column and a top grid shell; the login hall steel columns are arranged vertically on the ground in a matrix shape, and the login hall steel columns are located between two standard exhibition halls, and a basement beam slab is arranged on the top of the basement beam slab, and a first-floor steel column is arranged above the basement beam slab; the first-floor steel beam is arranged on the top of the first-floor steel column, and a second-floor steel column is arranged on the first-floor steel beam, and the second-floor steel beam is horizontally arranged on the top of the second-floor steel column; the top grid shell is a semi-elliptical structure and is buckled on the second-floor steel beam.

[0009] A large-span venue steel structure construction process, its innovation lies in: including the construction of standard exhibition halls and login halls; the specific construction process is as follows:

[0010] S1: Embedded parts installation: Measure and lay out the embedded parts according to the embedded parts layout drawing. When the foundation slab construction begins, the embedded parts layout work begins. If any errors are found in the template construction dimensions during layout, they must be promptly raised and corrected. The embedded parts are connected to the main concrete structure through anchor bars. The embedded anchor bars 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 support surface elevation is ≤±3mm, and the horizontal position offset of the anchor bolt center is ≤5mm.

[0011] S2: Installation of steel columns: Select different lifting machines according to the weight of the steel columns. When lifting steel columns, the crane should be positioned inside the venue and close to the steel columns. When lifting basement steel columns, the crane should be positioned on the basement roof.

[0012] S3: Installation of steel beams: Single beam hoisting is used, and multi-point lashing is used at the lifting points. Soft materials are used to pad the lashing points to prevent damage to the steel components. When lifting, the steel beam is first lifted about 50 cm from the ground, and the center of the steel beam is aligned with the center of the installation position. Then, the hook is slowly raised, and the steel beam is rotated with a slip rope to adjust the position so that the hook is in place. Bolts are inserted into the holes and initially tightened for temporary fixation. At the same time, verticality correction and final fixation are carried out. After the steel beam has been corrected, the bolts are finally tightened for final fixation.

[0013] S4: Installation of the entry hall: Install the entry hall steel columns in the basement and lay the basement beams on top of the entry hall steel columns; the truck crane is parked on the basement roof, and a layer of steel columns is set above the basement roof, and a layer of steel beams is hoisted. Then, the second-floor steel columns are hoisted on the first-floor steel beams, and then the second-floor steel beams and trusses are hoisted on the second-floor steel columns; after the first-floor floor slab pouring construction of the central corridor is completed, the full-floor scaffolding is erected, and the trusses between the second-floor steel columns are installed; then, the grid shell is hoisted on the top of the second-floor steel beams, and the remaining second-floor steel beams and outer trusses are hoisted;

[0014] S5: Installation of the standard exhibition hall: hoist the exhibition hall steel columns from both sides respectively, install the connecting steel beams between the exhibition hall steel columns, so that the exhibition hall steel columns are connected as a whole; then hoist the single-piece trusses between the exhibition hall steel columns; continue to hoist the exhibition hall steel columns, steel beams and single-piece trusses in sequence to form a longitudinal outer frame structure at the installation position of the standard exhibition hall; then install the main truss temporary support frame in the longitudinal outer frame structure; hoist the main truss and the main truss closing section in sequence, on this basis, hoist the adjacent main trusses in sequence, install the secondary truss between the two main trusses, so that they are connected as a whole; finally, continue to hoist the main and secondary trusses, roof connecting beams and roof structure in sequence to complete the installation of the standard exhibition hall.

[0015] Furthermore, the lifting point in S2 is set at the pre-welded connecting ear plate; in order to prevent the deformation of the lifting ear during lifting, a special lifting fixture is used, and the single-machine rotation method is adopted for lifting; before lifting, the steel column should be padded with sleepers to avoid contact between the bottom of the column and the ground during lifting, and the column end must not be dragged on the ground during lifting; the lifting hole on the ear plate at the column end is used to insert the clamping ring to fix it, and then the lifting test machine is required to be lifted slowly. When the root of the steel column is 200mm away from the ground, the lifting is stopped, the wire rope, sling, and fixture are checked, and the formal lifting can be carried out only after confirming that all aspects are safe and reliable.

[0016] Furthermore, in said S5, a temporary support cradle needs to be erected when the truss is installed, and the temporary support must ensure overall stability after being set up, and the temporary support is stabilized and reinforced by using rigid supports and guy ropes; the coordinate positioning dimensions of the in-place cradle template on the top of the temporary support must be guaranteed, and precise positioning must be performed using a total station.

[0017] Furthermore, in said S4, the grid shell is pre-assembled in sections; first, according to the detailed drawings, combined with the requirements for the arching of the components, while reserving the amount of welding shrinkage, a horizontal projection line of the grid shell is made on the plane of the roadbed substrate, and then the position of the node is selected to place the cradle; after the cradle is set, the rods in the width direction of the grid shell are hoisted and positioned with the cradle. When positioning the grid shell, attention is paid to the plate edge difference and the groove gap, and the interface is fixed with a connecting plate; after the assembly is completed, it is submitted to a full-time inspector for inspection; after the overall inspection of the grid shell is completed, the two pieces of the grid shell are welded as a group, and the width direction is divided into three sections, with the middle section as a filler.

[0018] Furthermore, in said S5, the single-piece truss is assembled. First, a tire frame is set. When setting the tire frame, the X, Y projection lines, elevation lines, inspection lines and support 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 assembled tire frame is set, the upper and lower chords made in the factory are hung on the tire frame for positioning and assembly. When positioning, the center line of the platform must be determined. After meeting the requirements, a temporary positioning plate is used to fix it. After the upper and lower chords are positioned, the webs are installed. When positioning, the center line of the platform must be determined. The assembly joints are checked. The groove gap and plate edge difference at the mouth shall be submitted for inspection and acceptance after confirmation, and assembly records shall be made; welding, flaw detection and post-weld correction detection shall be carried out after assembly and positioning, and after passing the inspection, welding shall be carried out, and an even number of welders shall be used for symmetrical welding. CO2 gas shielded welding shall be used for welding. Welding shall be completed continuously in one time, and then flaw detection shall be carried out as required. After that, the positioning plate shall be removed to make the lifting unit free. Then, the total station measurement technology shall be used to carry out a comprehensive inspection of the lifting unit after assembly and welding. Necessary corrections shall be made to the non-compliant or out-of-tolerance parts to meet the assembly accuracy required for lifting.

[0019] Furthermore, the inverted triangle main truss and the inverted triangle secondary truss are both manufactured in an assembly manner. First, a tire frame is set up. When setting up the tire frame, the X and Y projection lines should be laid out on the concrete ground according to the coordinates, and the elevation line, inspection line and support position should be laid out, and then submitted for acceptance. It can only be used after passing the acceptance. After the assembly tire frame is set up, the upper and lower chords made in the factory are hoisted on the tire frame in sections for positioning and assembly. When positioning, the center line and the segment position line on the platform must be determined, and the assembly matching marks at the segment interface and the groove gap and plate edge difference at the segment interface must be checked. After meeting the requirements, 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 tire frame; the upper and lower chords are located on the left and right sides of the assembly tire frame. After the rod is positioned, the web is installed. When positioning, the center line and segment position line on the platform must be determined, and the groove gap and plate edge difference at the assembly interface must be checked. After confirmation, it is submitted for inspection and acceptance, and assembly records are made. After assembly and positioning, if it is qualified, welding is carried out. An even number of welders are used for symmetrical welding. CO2 gas shielded welding is used. The welding should be completed continuously in one time, and then non-destructive testing is carried out as required. After that, the positioning plate is removed to make the lifting unit free. Then, the total station measurement technology is used to conduct a comprehensive inspection of the hoisting unit after assembly and welding. Necessary corrections should be made to the non-compliant or out-of-tolerance parts to meet the assembly accuracy required for hoisting. After passing the inspection, the paint is repaired.

[0020] Furthermore, S4: During the installation of the login hall, the cantilever section needs to be installed at the same time; first, temporary columns are installed and the main beams are hoisted; secondly, the edge-sealed composite steel beams and secondary beams are hoisted; then, the second-floor steel columns are hoisted; finally, the second-floor edge-sealed box beams are hoisted.

[0021] The advantages of the present invention are:

[0022] 1) The lattice shell structure of the present invention is optimized to form a hub node, the processing technology is simple, and batch production can be achieved in the factory. Compared with the lattice shell structure formed by welding nodes, this method greatly reduces the difficulty of appearance processing of the lattice shell; in addition, the lattice shell rods and the hub nodes are welded together, positioning is simple, and it is more conducive to controlling the overall quality and linear control of the structure; a special lifting structure is designed, and suitable lifting points are selected to provide theoretical support for lifting data; a specially designed frame is used to reduce the risk of lifting and installation, and solve the problem of lifting accuracy control; the above-mentioned improvements ensure the installability of the lifting, and the contour line of the structural assembly meets the design requirements, reducing the frequency of rework. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] FIG1 is a schematic diagram of a large-span steel structure login hall of a stadium according to the present invention.

[0025] FIG2 is a schematic diagram of a standard exhibition hall of a large-span steel structure of the present invention.

[0026] 3 to 9 are diagrams showing the construction status of a standard exhibition hall according to a large-span venue construction process of the present invention.

[0027] Figures 10 to 16 are construction status diagrams of a login hall of a large-span venue construction process of the present invention.

[0028] FIG17 is a construction status diagram of the login hall lattice shell of a large-span venue construction process of the present invention.

[0029] 18 to 20 are diagrams showing the construction of an inverted triangle truss according to a large-span stadium construction process of the present invention.

[0030] FIG21 is a structural diagram of a temporary support frame for a main truss of a large-span stadium construction process according to the present invention.

[0031] FIG22 is a diagram showing the hoisting status of the lattice shell construction process of a large-span stadium construction process according to the present invention.

[0032] FIG23 is a structural diagram of a scaffolding for the construction of a lattice shell for a large-span stadium construction process according to the present invention.

[0033] 24 to 27 are construction status diagrams of a cantilever section of a large-span stadium construction process according to the present invention.

[0034] Implementation Method

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] As shown in Figures 1 and 2, a large-span venue steel structure includes a standard exhibition hall 1 and a registration hall 2; the standard exhibition hall 1 has a pair of registration halls 2, and the registration hall 2 presents a T-shaped structure, and the standard exhibition halls 1 are respectively arranged on both sides of the registration hall 2, and the standard exhibition halls 1 are symmetrically arranged with respect to the registration hall 2;

[0038] Standard Exhibition Hall 1 includes inverted triangle main trusses, inverted triangle secondary trusses, edge-sealed monolithic 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 connected between the exhibition hall steel columns. The inverted triangle main trusses and inverted triangle secondary trusses are respectively installed on the top of the steel columns to form a rectangular parallelepiped frame structure. The edge-sealed monolithic trusses are installed between adjacent exhibition hall steel columns.

[0039] Login hall 2 includes a middle corridor 21 and a cantilever section 22, and the cantilever section 22 is arranged at the end of the middle corridor 21 to form a T-shaped structure; login hall 2 includes a first-floor steel beam, a second-floor steel beam, login hall steel columns and a top grid shell; the login hall steel columns are arranged vertically on the ground in a matrix shape, and the login hall steel columns are located between two standard exhibition halls, and basement beams are set on the top of the login hall steel columns, and a first-floor steel column is set above the basement beams; the first-floor steel beams are set at the top of the first-floor steel columns, and the second-floor steel columns are set on the first-floor steel beams, and the second-floor steel beams are horizontally arranged on the top of the second-floor steel columns; the top grid shell is a semi-elliptical structure and is buckled on the second-floor steel beams.

[0040] Figures 3 to 23 show a large-span venue steel structure construction process, including the construction of standard exhibition halls and login halls. The specific construction process is as follows:

[0041] S1: Embedded parts installation: Measure and lay out the embedded parts according to the embedded parts layout drawing. When the foundation slab construction begins, the embedded parts layout work begins. If any errors are found in the template construction dimensions during layout, they must be promptly raised and corrected. The embedded parts are connected to the main concrete structure through anchor bars. The embedded anchor bars 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 support surface elevation is ≤±3mm, and the horizontal position offset of the anchor bolt center is ≤5mm.

[0042] S2: Installation of steel columns: different lifting machinery should be selected according to the weight of the steel columns. When lifting the steel columns, the crane should be positioned inside the venue and lift near the steel columns. When lifting the basement steel columns, the crane should travel on the basement ceiling and the lifting point should be set at the pre-welded connecting ear plate. In order to prevent deformation of the lifting ears during lifting, special lifting fixtures should be used and the lifting should be carried out using a single-machine rotation method. Before lifting, the steel columns should be padded with sleepers to avoid contact between the bottom of the columns and the ground during lifting. During lifting, the column ends should not be dragged on the ground. The lifting holes on the ear plates at the column ends should be used to insert the clamps and fix them. Then the lifting should be tested. The lifting should be done slowly. When the root of the steel column is 200mm off the ground, the lifting should be stopped and the wire rope, sling and fixtures should be checked. The official lifting can only be carried out after ensuring that all aspects are safe and reliable.

[0043] S3: Installation of steel beams: Single beam hoisting is used, and multi-point lashing is used at the lifting points. Soft materials are used to pad the lashing points to prevent damage to the steel components. When lifting, the steel beam is first lifted about 50 cm from the ground, and the center of the steel beam is aligned with the center of the installation position. Then, the hook is slowly raised, and the steel beam is rotated with a slip rope to adjust the position so that the hook is in place. Bolts are inserted into the holes and initially tightened for temporary fixation. At the same time, verticality correction and final fixation are carried out. After the steel beam has been corrected, the bolts are finally tightened for final fixation.

[0044] S4: Installation of the login hall: Install the login hall steel columns of the basement, and lay the basement beams on the top of the login hall steel columns; the car crane is parked on the basement roof, and a layer of steel columns is set above the basement roof, and a layer of steel beams is hoisted, and then the second-floor steel columns are hoisted on the first-floor steel beams, and then the second-floor steel beams and trusses are hoisted on the second-floor steel columns; after the pouring construction of the first-floor floor slab of the middle corridor is completed, the full-floor scaffolding is set up, and the trusses between the second-floor steel columns are continued to be installed; then the gridshell is hoisted on the top of the second-floor steel beams and the remaining second-floor steel beams and the outer trusses are hoisted; the gridshell is pre-assembled in sections; first, according to the detailed drawings, combined with the arch requirements of the components, and while reserving welding shrinkage, the gridshell is pre-assembled on the roadbed Make a horizontal projection line of the gridshell on the plane, and then select the position of the node to place the cradle; after the cradle is set, hoist the rods in the width direction of the gridshell and position them with the cradle. When positioning the gridshell, pay attention to the edge difference and the groove gap, and fix the interface with a connecting plate; after assembly, submit it to a full-time inspector for inspection; after the overall inspection of the gridshell is completed, weld the two pieces of the gridshell as a group, divide it into three sections in the width direction, and use the middle as a filler; during the installation of the login hall, the cantilever section needs to be installed at the same time; as shown in Figures 23 to 26, first, install temporary columns and hoist the main beam; secondly, hoist the edge-sealed composite steel beam and secondary beam; then, hoist the second-floor steel columns; finally, hoist the second-floor edge-sealed box beam.

[0045] S5: Installation of the standard exhibition hall: hoist the exhibition hall steel columns from both sides respectively, install the connecting steel beams between the exhibition hall steel columns, so that the exhibition hall steel columns are connected as a whole; then hoist the single-piece trusses between the exhibition hall steel columns; continue to hoist the exhibition hall steel columns, steel beams and single-piece trusses in sequence to form a longitudinal outer frame structure at the installation position of the standard exhibition hall; then install the main truss temporary support cradle in the longitudinal outer frame structure; hoist the main truss and the main truss closing section in sequence, on this basis, hoist the adjacent main trusses in sequence, install the secondary truss between the two main trusses to connect them as a whole; finally, continue to hoist the main and secondary trusses, roof connecting beams and roof structure in sequence to complete the installation of the standard exhibition hall; a temporary support cradle is required for truss installation, and the temporary support must ensure overall stability after establishment, and the temporary support must be stabilized and reinforced with rigid support and guy ropes; the coordinate positioning dimensions of the in-place cradle template on the top of the temporary support must be guaranteed, and precise positioning is performed using a total station.

[0046] The single-piece truss is assembled in an assembled manner. First, the tire frame is set up. When setting up the tire frame, the X, Y projection lines, elevation lines, inspection lines and support positions should be laid out on the concrete pavement according to the coordinates, and then submitted for acceptance. It can only be used after passing the acceptance. After the assembly tire frame is set up, the upper and lower chords made in the factory are hung on the tire frame for positioning and assembly. When positioning, the center line of the platform must be determined. After meeting the requirements, temporary positioning plates are used to fix them. After the upper and lower chords are positioned, the web members are installed. When positioning, the center line of the platform must be determined. Check the grooves at the assembly interface. Gap and plate edge difference, after confirmation, submit for inspection and acceptance, and make assembly records; welding, flaw detection and post-weld correction detection, after assembly and positioning, after inspection and passing, welding can be carried out, and even number of welders are used for symmetrical welding, CO2 gas shielded welding is used, welding should be completed continuously in one time, and then flaw detection is carried out as required, and then the positioning plate is removed to make the lifting unit in a free state, and then the total station measurement technology is used to carry out a comprehensive inspection of the lifting unit after assembly and welding, and necessary corrections should be made for non-conforming or out-of-tolerance parts to meet the assembly accuracy required for lifting.

[0047] As shown in Figures 18 to 20, the inverted triangle main truss and the inverted triangle secondary truss are both made by assembly. First, a tire frame is set up. When setting up the tire frame, the X and Y projection lines should be laid out on the concrete ground according to the coordinates, the elevation line, the inspection line and the support position should be laid out, and the lines should be submitted for acceptance. They can only be used after passing the acceptance. After the assembly tire frame is set up, the upper and lower chords made in the factory are hoisted on the tire frame in sections for positioning and assembly. When positioning, the center line and the segment position line on the platform must be aligned, the assembly matching marks at the segment interface and the groove gap and plate edge difference at the segment interface must be checked, and temporary positioning plates are used for fixing after meeting the requirements. The truss is assembled in a side-by-side manner, that is, the chord is located on the left and right sides of the assembly tire frame. After the upper and lower chords are positioned, the web is installed. When positioning, the center line and the segment position line on the platform must be aligned, the groove gap and plate edge difference at the assembly interface must be checked, and the lines are submitted for inspection and acceptance after confirmation, and assembly records are made. After assembly and positioning, if qualified, welding is carried out, and even number of welders are used for symmetrical welding, and welding is carried out using CO 2. Gas shielded welding. The welding should be completed continuously in one go, and then the NDT should be carried out as required. After that, the positioning plate should be removed to make the lifting unit free. Then, the total station measurement technology should be used to conduct a comprehensive inspection of the assembled and welded lifting unit. For any non-conforming or out-of-tolerance parts, necessary corrections should be made to meet the assembly accuracy required for the lifting. After passing the inspection, the paint should be repaired.

[0048] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-span stadium steel structure, characterized by: It includes a standard exhibition hall and a registration hall; the standard exhibition hall has a pair, the registration hall presents a T-shaped structure, and the standard exhibition halls are respectively arranged on both sides of the registration hall, and the standard exhibition halls are symmetrically arranged with respect to the registration hall; The standard exhibition hall comprises an inverted triangle main truss, an inverted triangle secondary truss, an edge-sealed monolithic truss, an exhibition hall steel column and a connecting steel beam; the exhibition hall steel columns are arranged on the ground in a matrix shape; the connecting steel beam is arranged horizontally and connected between the exhibition hall steel columns; the inverted triangle main truss and the inverted triangle secondary truss are respectively arranged on the top of the steel column to form a rectangular parallelepiped frame structure; the edge-sealed monolithic truss is arranged between adjacent exhibition hall steel columns; The login hall includes a middle corridor and a cantilevered section, and the cantilevered section is arranged at the end of the middle corridor to form a T-shaped structure; the login hall includes a first-floor steel beam, a second-floor steel beam, a login hall steel column and a top grid shell; the login hall steel column is vertically arranged on the ground in a matrix shape, and the login hall steel column is located between two standard exhibition halls, a basement beam slab is arranged on the top of the login hall steel column, and a first-floor steel column is arranged above the basement beam slab; the first-floor steel beam is arranged on the top of the first-floor steel column, and a second-floor steel column is arranged on the first-floor steel beam, and the second-floor steel beam is horizontally arranged on the top of the second-floor steel column; the top grid shell is a semi-elliptical structure and is buckled on the second-floor steel beam.

2. A large-span stadium steel structure construction process, characterized by: Including the construction of standard exhibition hall and registration hall; the specific construction process is as follows: S1: Embedded parts installation: According to the embedded parts layout drawing, measure and lay out the embedded parts; when the foundation slab begins construction, the embedded parts layout work begins; if any errors are found in the template construction dimensions during layout, timely propose and require rectification; the embedded parts are connected to the main concrete structure through anchor bars, and the embedded parts anchor bars must be spot welded and tied firmly with the main steel bars. The allowable error of the embedded parts is strictly controlled, that is, the support surface elevation is ≤±3mm, and the horizontal position of the center offset of the anchor bolt is ≤5mm; S2: Installation of steel columns: different lifting machines are selected according to the weight of the steel columns. When lifting steel columns, the crane stands inside the venue and lifts near the steel columns. When lifting basement steel columns, the crane moves on the basement roof. S3: Installation of steel beams: Single beam hoisting is adopted, and multi-point binding is adopted for the hoisting points. Soft materials are used to pad the binding points to prevent damage to the steel components. When hoisting, the steel beam is first lifted about 50cm from the ground, so that the center of the steel beam is aligned with the center of the installation position, and then the hook is slowly raised, and the steel beam is rotated with a slip rope to adjust the position so that the hook is in place, and the bolts are inserted into the holes and initially tightened for temporary fixation, and the verticality correction and final fixation are carried out at the same time; after the steel beam is corrected, the bolts are finally tightened for final fixation; S4: Installation of the entrance hall: Install the steel columns of the entrance hall in the basement, and lay the basement beams on the top of the steel columns of the entrance hall; the truck crane is parked on the basement roof, a layer of steel columns is set above the basement roof, and a layer of steel beams is hoisted, and then the second-floor steel columns are hoisted on the first-floor steel beams, and then the second-floor steel beams and trusses are hoisted on the second-floor steel columns; after the pouring construction of the first-floor floor slab of the middle corridor is completed, the full-hall scaffolding is set up, and the trusses between the second-floor steel columns are continued to be installed; then the grid shell is hoisted on the top of the second-floor steel beams and the remaining second-floor steel beams and the outer trusses are hoisted; S5: Installation of standard exhibition hall: hoist the exhibition hall steel columns from both sides respectively, install the connecting steel beams between the exhibition hall steel columns, so that the exhibition hall steel columns are connected as a whole; then hoist the single-piece trusses between the exhibition hall steel columns; continue to hoist the exhibition hall steel columns, steel beams and single-piece trusses in sequence to form a longitudinal outer frame structure at the installation position of the standard exhibition hall; then install the main truss temporary support frame in the longitudinal outer frame structure; The main trusses and the closed sections of the main trusses are hoisted in sequence. On this basis, the adjacent main trusses are hoisted in sequence, and the secondary trusses are installed between the two main trusses to connect them into a whole. Finally, the main and secondary trusses, roof connecting beams and roof structures are hoisted in sequence to complete the installation of the standard exhibition hall.

3. The large-span stadium steel structure construction process according to claim 2 is characterized by: The lifting point in S2 is set at the pre-welded connecting ear plate; in order to prevent the deformation of the lifting ear during lifting, a special lifting fixture is used, and the single-machine rotation method is adopted for lifting; before lifting, the steel column should be padded with sleepers to avoid the contact between the bottom of the column and the ground during lifting, and the column end should not be dragged on the ground during lifting; the clamping ring is inserted into the lifting hole on the ear plate at the column end to fix it, and then the lifting test machine is required to lift slowly. When the root of the steel column is 200mm away from the ground, stop lifting, check the wire rope, sling, and fixture, and make sure that all aspects are safe and reliable before officially lifting.

4. The large-span stadium steel structure construction process according to claim 2 is characterized by: In S5, a temporary support frame needs to be set up when the truss is installed, and the temporary support must ensure overall stability after being set up. Rigid supports and guy ropes are used to stabilize and reinforce the temporary support. The coordinate positioning dimensions of the in-place frame template on the top of the temporary support must be guaranteed, and precise positioning must be performed using a total station.

5. The large-span stadium steel structure construction process according to claim 2 is characterized by: In the S4, the grid shell is pre-assembled in sections; first, according to the detailed drawings, combined with the requirements for arching of the components, and with a reserve for welding shrinkage, a horizontal projection line of the grid shell is made on the plane of the roadbed substrate, and then the position of the node is selected to place the tire frame; after the tire frame is set, the rods in the width direction of the grid shell are hoisted and positioned with the tire frame. When positioning the grid shell, pay attention to the plate edge difference and the groove gap, and fix the interface with a connecting plate; after the assembly is completed, it is submitted to a full-time inspector for inspection; after the overall inspection of the grid shell is completed, the two pieces of the grid shell are welded as a group, and the width direction is divided into three sections, with the middle as a filler.

6. The large-span stadium steel structure according to claim 1 is characterized by: In S5, the single-piece truss is assembled. First, the tire frame is set. When setting the tire frame, the X, Y projection lines, elevation lines, inspection lines and fulcrum positions should be placed on the concrete pavement according to the coordinates, and then submitted for acceptance. It can only be used after acceptance. After the assembly tire frame is set, the upper and lower chords made in the factory are hung on the tire frame for positioning and assembly. When positioning, they must be aligned with the center line of the platform. After meeting the requirements, they are fixed with temporary positioning plates. After the upper and lower chords are positioned, the web bars are installed. When positioning, they must be aligned with the center line of the platform. Check the assembly interface. The groove gap and plate edge difference should be submitted for inspection and acceptance after confirmation, and the assembly record should be made; welding, flaw detection and post-weld correction detection, after assembly and positioning, welding can be carried out after passing the inspection. An even number of welders should be used for symmetrical welding. CO2 gas shielded welding should be used for welding. The welding should be completed in one continuous welding, and then flaw detection should be carried out as required. After that, the positioning plate should be removed to make the lifting unit in a free state. Then, the total station measurement technology should be used to carry out a comprehensive inspection of the lifting unit after assembly and welding. Necessary corrections should be made for non-conforming or out-of-tolerance parts to meet the assembly accuracy required for lifting.

7. The large-span stadium steel structure according to claim 1 is characterized by: The inverted triangle main truss and the inverted triangle secondary truss are both manufactured by assembly. First, a tire frame is set up. When the tire frame is set up, the X and Y projection lines should be laid out on the concrete ground according to the coordinates, and the elevation line, inspection line and fulcrum position should be laid out, and then submitted for acceptance. It can only be used after acceptance. After the assembly tire frame is set up, the upper and lower chords made in the factory are hoisted in sections on the tire frame for positioning and assembly. When positioning, the center line and the segment position line on the platform must be aligned, and the assembly matching marks at the segment interface and the groove gap and plate edge difference at the segment interface must be checked. After meeting the requirements, temporary positioning plates are used to fix them. The truss is assembled by side assembly, that is, the chord is located on the left and right sides of the assembly tire frame. After the upper and lower chords are positioned, the web is installed. When positioning, the center line and the segment position line on the platform must be aligned, and the groove gap and plate edge difference at the assembly interface must be checked. After confirmation, submit it for inspection and acceptance, and make assembly records; after assembly and positioning, if it is qualified after inspection, welding will be carried out, and an even number of welders will be used for symmetrical welding. CO2 gas shielded welding is used for welding. The welding should be completed in one continuous welding, and then flaw detection is carried out as required. After that, the positioning plate is removed to make the lifting unit in a free state, and then the total station measurement technology is used to carry out a comprehensive inspection of the lifting unit after assembly and welding. For non-conformance or out-of-tolerance parts, necessary corrections should be made to meet the assembly accuracy required for lifting; after passing the inspection, the paint is repaired.

8. The large-span stadium steel structure construction process according to claim 2 is characterized by: S4: During the installation of the login hall, the cantilever section needs to be installed at the same time; first, temporary columns are installed and the main beams are hoisted; secondly, the edge-sealed composite steel beams and secondary beams are hoisted; then, the second-floor steel columns are hoisted; finally, the second-floor edge-sealed box beams are hoisted.

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