Quasi-fan-shaped arched modular steel truss structure and construction method thereof

Abstract

The invention relates to a fan-like arch modular steel truss structure and a construction method thereof, and belongs to the technical field of large building roof steel structures, the fan-like arch modular steel truss structure comprises an embedded plate, a plurality of first steel columns and a plurality of second steel columns are arranged on the embedded plate, the first steel columns are connected with first frame modules, and the second steel columns are connected with second frame modules; first connecting joints are arranged among the modules, so that the plurality of first frame modules are spliced into a middle finger corridor, and the plurality of second frame modules are jointly spliced into a south finger corridor and a north finger corridor; and third steel columns and fourth steel columns are further included, third frame modules are connected between the third steel columns and the fourth steel columns and between the first steel columns and the second steel columns, the multiple third frame modules are jointly spliced into a main building, and a skylight is connected between the middle finger corridor and the main building. The modular design of the large building roof steel structure is achieved, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of steel structure technology for large building roofs, and in particular to a fan-shaped arch modular steel truss structure and its construction method. Background Technology

[0002] In large public buildings such as airport terminals, convention centers, and major transportation hubs, roof structures commonly adopt irregular designs such as fan-shaped and arched shapes to adapt to the functional zoning layout and optimize the spatial visual effect. At the same time, they must meet the core requirements of large-span coverage, high-strength load-bearing capacity, and multi-area coordinated connection. Due to their complex outline curves and large span dimensions, these irregular roof structures have become the core design highlight of large buildings, but they also bring many challenges to construction.

[0003] Currently, the industry generally adopts a point-by-point connection model for the construction of such irregular roof steel structures. Individual components are transported to the site and then assembled piece by piece through on-site welding or simple bolt connections. Since there are no unified standards for the curvature and dimensions of irregular structures, the position and angle of each component must be repeatedly calibrated during on-site assembly to fit the irregular contour. This not only relies on a large amount of manual operation, resulting in extremely low assembly efficiency, but also easily leads to deviations in the overall curvature of the roof and messy connections due to the accumulation of errors from each segment. At the same time, the splicing of scattered components lacks an overall modular stress coordination design, resulting in insufficient stability at the structural joints and easy occurrence of local stress concentration problems, which further affects the safety performance of the roof structure.

[0004] While some projects have attempted to introduce modular concepts, the existing modules are mostly rectangular or regular shapes. Due to the complex design of the connection nodes between irregularly shaped modules, rapid and precise splicing cannot be achieved. The existing modules lack standardized module units and supporting connection systems designed for the characteristics of irregular structures, which cannot fundamentally solve the construction problems of irregular roof structures. This results in difficulties in quickly and accurately connecting irregular roofs in different areas, leading to chaotic construction processes, lengthy construction periods, and an inability to meet the efficient, precise, and safe construction requirements of large public buildings. Summary of the Invention

[0005] In order to realize the modular design of large building roof steel structures and improve construction efficiency, this application provides a fan-shaped arch modular steel truss structure and its construction method.

[0006] This application provides a modular steel truss structure with a fan-shaped arch and its construction method, which adopts the following technical solution:

[0007] A fan-shaped arch-shaped modular steel truss structure includes an embedded plate. A plurality of first steel columns and a plurality of second steel columns are provided on the embedded plate. First frame modules are connected to the first steel columns, and second frame modules are connected to the second steel columns. First connecting joints are provided between adjacent first frame modules, between adjacent second frame modules, and between adjacent first and second frame modules. This allows the plurality of first frame modules to be assembled into a central finger corridor, and the plurality of second frame modules to be assembled into a south finger corridor and a north finger corridor. Simultaneously, the central finger corridor is interconnected with the south and north finger corridors.

[0008] It also includes a third steel column and a fourth steel column. The third steel column and the fourth steel column are connected to the first steel column and the second steel column by a third frame module. Several third frame modules are assembled together to form the main building. The central concourse is connected to the main building by a skylight.

[0009] By adopting the above technical solutions, the differentiated interface design of the first, second, third, and fourth steel columns corresponds to different connection positions. Combined with the first, second, and third frame modules, a standardized assembly system is formed, enabling the entire building to be assembled from several prefabricated modules through corresponding connection joints. This significantly reduces on-site work and improves overall assembly efficiency. At the same time, the shape and precision of the prefabricated modules can be set as needed, ensuring precise alignment of each joint and preventing the accumulation of errors during segment-by-segment assembly. This not only improves construction efficiency and shortens the construction period but also enables modular assembly construction of irregular structures, ensuring the assembly precision of irregular structures.

[0010] Optionally, the top of the first steel column is provided with a first interface and two second interfaces along its circumference. The included angle between the two second interfaces is an obtuse angle on the same horizontal plane. Several first steel columns located in the same row are arranged in an arc shape. The end of the first steel column away from the first interface is provided with two third interfaces. The two second interfaces and the two third interfaces are symmetrically arranged about the center vertical line of the first interface.

[0011] The third steel column and the fourth steel column are provided with two first interfaces and two second interfaces. The two first interfaces are respectively located on both sides of the third steel column and the fourth steel column. The two second interfaces are spaced apart from the two first interfaces and are symmetrical about the line connecting the two first interfaces. The included angle between the two second interfaces is an obtuse angle on the same horizontal plane.

[0012] By adopting the above technical solutions, the obtuse angle setting of the two second interfaces on the first steel column, the arc arrangement of the first steel columns in the same row, and the symmetrical arrangement of the interfaces on the third and fourth steel columns, not only is the force balance guaranteed, but also the modules of the central concourse and the main building are naturally connected to form a fan-shaped structure. Without the need to adjust the angle of the components on site, it can accurately fit the contour of the irregular roof and naturally form a fan-shaped structure, which is suitable for the architectural zoning and spatial visual needs.

[0013] Optionally, the first and second steel columns below the central concourse are arranged in two rows, and the two rows of first and second steel columns are arranged in a fan shape. A first steel truss connects two adjacent first steel columns in the inner circle, and a cantilever beam connects two adjacent first steel columns in the outer circle. A truss connecting frame is provided at the center of the first steel truss, and the truss connecting frame is provided with two truss connecting ports.

[0014] By adopting the above technical solution, the inner first steel truss and the outer cantilever beam form a cooperative support structure in the two rows of fan-shaped steel columns below the central concourse. This not only expands the support span of a single steel column, but also provides a stable benchmark for module splicing. The design of the truss connection port in the truss connector enables precise docking between the first frame module and the steel column, while providing a reliable connection point for the connection device between modules, thus improving installation stability.

[0015] Optionally, the first connection joint includes four first connection interfaces, each of which is opposite to one of the third interfaces or the truss connection ports. A first angle is formed between the two first connection interfaces facing away from the skylight, and a second angle is formed between the two first connection interfaces facing the skylight. The angles of the first angle and the second angle gradually increase from the center of the middle concourse to the north concourse and the south concourse at both ends.

[0016] By adopting the above technical solution, the four interfaces of the first connecting joint are precisely aligned with the third interface of the steel column or the truss connection port, ensuring the accuracy of the connector installation; the first included angle and the second included angle gradually expand from the central concourse to the north and south concourses, which fits the outline extension requirements of the fan-shaped roof, so that each concourse is smoothly connected to the main building without splicing misalignment, which not only ensures the visual integrity of the roof arc, but also avoids the problem of uneven stress caused by poor outline adaptation.

[0017] Optionally, a second steel truss is provided between the third interface and the first connection interface, and between the truss connection port and the first connection interface, so that each first connection joint is connected to four second steel trusses, and the four second steel trusses are arranged in an X shape between the two rows of first steel columns and second steel columns.

[0018] By adopting the above technical solution, the second steel truss connects the third interface of the steel column, the first connecting joint and the truss connection port, and is arranged in an X shape between the two rows of steel columns to form a three-dimensional spatial force system, which effectively disperses the load, improves the structure's resistance to lateral displacement and torsion, greatly improves the support stability, and provides a reliable force guarantee for the large-span coverage of irregular roofs.

[0019] Optionally, a reinforcing rod is connected between the first steel column and its opposite first truss connecting frame, and several rows of connecting rods are passed through the second steel trusses. The several rows of connecting rods are arranged parallel to the cantilever beam and located between the cantilever beam and the first steel truss.

[0020] By adopting the above technical solutions, the reinforcing rods and connecting rods enhance the lateral and longitudinal stiffness of the frame, preventing relative deformation of the first frame components; the multiple rows of connecting rods between the second steel trusses are arranged parallel to the cantilever beam, connecting each load-bearing unit in series, so that the cantilever beam, the first steel truss and the second steel truss form a cooperative load-bearing system, effectively transferring loads, dispersing stress, improving the overall fatigue resistance of the structure, and preventing local node loosening or deformation.

[0021] Optionally, the first steel column in the third frame module is connected to a third steel truss, and the four third steel trusses are connected to a second connecting joint, which includes a second connecting interface and a third connecting interface.

[0022] The third steel truss includes an upper chord, a lower chord, and web members. One end of the upper chord is connected to the first steel column, and the other end is connected to the first connection interface. One end of the lower chord is connected to the first steel column, and the other end is connected to the lower chord of the adjacent third steel truss.

[0023] The second connecting joint is connected to a connecting rod, and the end of the connecting rod away from the second connecting joint is connected to the cantilever beam. The third connecting interface is connected to the web member.

[0024] By adopting the above technical solutions, the cooperation between the upper chord, lower chord, and web members of the third steel truss in the third frame module and the second connecting joint enables the standardized prefabrication and precise splicing of the main building module; the connecting rod connects the second connecting joint and the cantilever beam, so that the main building and the central concourse form a force linkage, which solves the problem of insufficient adaptation and disconnection of the existing modular design in the main building area, and ensures the integrity and stability of the overall structure.

[0025] Optionally, a lattice column is provided below both the first and second connecting joints as a temporary support. The lattice column includes four uprights, with several horizontal and diagonal bars connecting the four uprights. Node plates are provided at the top and bottom of each upright. Several reinforcing ribs are provided on the node plates along the circumference of the uprights, and the reinforcing ribs are perpendicular to the node plates. A transfer beam is provided at the bottom of the lattice column, and an adjusting steel plate is provided at the top of the lattice column.

[0026] By adopting the above technical solution, the lattice columns below the first and second connecting joints adopt a spatial truss structure of vertical, horizontal and diagonal bars, combined with node plates with reinforcing ribs, which has high strength and high stability support capabilities. The design of the bottom transfer beam and the top adjustable steel plate can precisely adjust the support height to adapt to the height difference requirements of fan-shaped structures, effectively avoid structural deformation during the module splicing process, ensure the safety and splicing accuracy during the construction phase, and solve the problems of poor adaptability to irregular structures and insufficient support stability of existing temporary supports.

[0027] Optionally, the first steel column, the second steel column, the third steel column, and the fourth steel column are all provided with cross stiffening plates. The cross stiffening plates are arranged along the height direction of the supporting steel column assembly and are welded and fixed to the inner wall of the supporting steel column. The end plates of the cross stiffening plates have the same thickness as the column wall of the supporting steel column.

[0028] By adopting the above technical solution, the cross stiffening plates inside each steel column are arranged along the height direction and welded to the column wall. The end plates have the same thickness as the column wall, which significantly improves the steel column's resistance to buckling and torsion, and avoids local deformation or instability of the steel column under load. It provides a reliable vertical support foundation for the entire fan-shaped structure, extends the service life of the structure, and ensures the long-term safety performance of the roof of large public buildings.

[0029] A construction method for a fan-shaped arch-shaped modular steel truss includes the following steps:

[0030] S1: Prefabricate several sets of first frame modules, second frame modules and third frame modules, install embedded plates in the preset area, install first steel columns and second steel columns on the embedded plates, and install third steel columns and fourth steel columns on the ground;

[0031] S2: Connect the cantilever beam and the first steel truss between adjacent steel columns;

[0032] S3: The prefabricated module is hoisted onto the corresponding steel column and connected to the prefabricated module through the third interface at the top of the steel column. Two adjacent prefabricated modules are spliced ​​together through the first or second connecting joint to form a fan-shaped roof frame module. At the same time, temporary lattice columns are set below the first and second connecting joints for temporary support.

[0033] S4: Connect the skylight between the central concourse and the main building. The skylight uses components of the central concourse and the main building as connection points to connect the three and form an overall frame structure.

[0034] S5: Remove the temporary lattice columns after construction is completed.

[0035] By adopting the above technical solutions, the construction method uses a process of prefabricated modules, on-site assembly, temporary support, and overall connection, which is adapted to the construction requirements of modular structures. Prefabricated modules reduce on-site work, temporary lattice columns ensure assembly stability, skylight connection realizes the overall formation of the central concourse and the main building, and structural stress coordination after the removal of temporary support perfectly solves the problems of chaotic construction process, long construction period, and difficulty in controlling precision of existing irregular roof construction, and meets the construction requirements of large public buildings for efficiency, precision and safety.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. Different steel columns adopt differentiated interface designs and are connected to the first frame module, the second frame module and the third frame module respectively to form a standardized assembly system; the whole building is assembled from prefabricated modules through the first connection joint and the second connection joint, which greatly reduces the amount of on-site work, improves the overall assembly efficiency, avoids the accumulation of errors in segment assembly, and can realize the modular assembly of irregular structures, ensure assembly accuracy, and shorten the construction period.

[0038] 2. The arrangement of the two obtuse-angled second interfaces of the first steel column, the arc-shaped steel columns, and the symmetrical interfaces of the third and fourth steel columns not only ensures the balance of forces but also allows the modules to be naturally connected to form a fan-shaped structure. This eliminates the need for on-site adjustment of component angles, precisely fits the irregular roof outline, and adapts to the architectural zoning and spatial visual requirements.

[0039] 3. The two rows of fan-shaped steel columns below the central concourse, together with the inner first steel truss and the outer cantilever beam, form a collaborative support structure, expanding the support span; the truss connection port enables precise docking between the module and the steel column, providing a stable benchmark for module splicing and improving installation stability;

[0040] 4. The X-shaped arrangement of the second steel truss constructs a three-dimensional spatial force system, which, together with the reinforcing rods and connecting rods, strengthens the frame stiffness, effectively disperses the load, transfers stress, improves the structure's resistance to lateral displacement and torsion, avoids local stress concentration, and ensures the support stability of the large-span irregular roof.

[0041] 5. The lattice columns adopt a spatial truss structure and node plates with reinforcing ribs, which provides high support strength and good stability; the bottom transfer beam and the top adjustable steel plate can precisely adjust the support height to adapt to the height difference requirements of irregular structures, avoid module splicing deformation, and ensure construction safety and assembly accuracy. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0043] Figure 2 This is a schematic diagram illustrating the structure of the steel column in an embodiment of this application.

[0044] Figure 3 This is a schematic diagram illustrating the structure of the cross-shaped stiffening plate in an embodiment of this application.

[0045] Figure 4 This is a structural diagram illustrating the first frame module in an embodiment of this application.

[0046] Figure 5 This is a structural diagram illustrating the second frame module in an embodiment of this application.

[0047] Figure 6 This is a structural diagram illustrating the third frame module in an embodiment of this application.

[0048] Figure 7 This is a structural schematic diagram illustrating the lattice column in an embodiment of this application.

[0049] Figure 8 This is a schematic diagram illustrating the structure of the connecting joint in the embodiments of this application.

[0050] Explanation of reference numerals in the attached drawings: 1. Embedded plate; 11. Middle concourse; 12. South concourse; 13. North concourse; 14. Main building; 15. Skylight; 151. Diamond-shaped cross brace; 16. Spherical support; 21. First steel column; 211. First interface; 212. Second interface; 213. Third interface; 214. Cross stiffening plate; 215. Temporary diagonal brace; 22. Second steel column; 23. Third steel column; 24. Fourth steel column; 3. First frame module; 31. Cantilever beam; 32. First steel truss; 33. Truss connecting frame; 331. Truss connection port; 34. First connecting joint; 341. First included angle; 3 42. Second included angle; 343. First connection interface; 35. Second steel truss; 36. Reinforcing rod; 37. Rhomboid steel frame; 38. Connecting rod; 4. Second frame module; 41. Frame beam; 42. Cross steel beam; 43. Secondary beam; 5. Third frame module; 51. Third steel truss; 511. Top chord; 512. Bottom chord; 513. Web member; 52. Second connection joint; 521. Second connection interface; 522. Third connection interface; 6. Lattice column; 61. Vertical column; 62. Horizontal bar; 63. Diagonal bar; 64. Node plate; 641. Reinforcing rib; 65. Transfer beam; 66. Adjusting steel plate. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0052] This application discloses a fan-shaped arch-shaped modular steel truss structure and its construction method.

[0053] like Figures 1 to 3 A type of fan-shaped arch modular steel truss structure includes an embedded plate 1, on which a plurality of first steel columns 21 and second steel columns 22 are provided. The first steel columns 21 are connected to the embedded plate 1 through a conversion support, and a spherical support 16 is provided below the second steel columns 22, which is hinged to the embedded plate 1 through the spherical support 16.

[0054] Several first steel columns 21 and second steel columns 22 are arranged in three rows and are set in a semi-arc shape. The area between the two rows of first steel columns 21 and second steel columns 22 on the outer ring is the middle concourse 11, the south concourse 12 and the north concourse 13. The middle concourse 11 is located between the south concourse 12 and the north concourse 13. The middle concourse 11 has a fan-shaped structure. The south concourse 12 and the north concourse 13 are connected to one end of the middle concourse 11, naturally transitioning to a parallel straight channel structure. The middle concourse 11 is provided with a first frame module 3 and a second frame module 4. The south concourse 12 and the north concourse 13 are provided with a second frame module 4.

[0055] The top of the first steel column 21 is provided with a first interface 211, two second interfaces 212 and two third interfaces 213. The two second interfaces 212 and the two third interfaces 213 are symmetrically distributed on both sides of the vertical line of the first interface 211, and the two second interfaces 212 form a preset obtuse angle between each other on the same horizontal plane. The first interface 211 is used for connecting different area plates, the second interface 212 is used to connect two adjacent first steel columns 21 or to connect with other steel columns, and the third interface 213 is used to connect the connecting parts between the first frame modules 3, so as to realize the firm fixation of the first steel column 21 with other foundation structures and lay a reliable foundation for subsequent module splicing.

[0056] The outer ring of the central concourse 11 includes eleven first steel columns 21 and two second steel columns 22. The two second steel columns 22 are located at both ends, forming an arc-shaped support structure. The inner ring of the central concourse 11 is provided with six first steel columns 21 and two second steel columns 22. The two second steel columns 22 are located at both ends of the six first steel columns 21.

[0057] The central concourse 11 is assembled from five first frame modules 3 and two second frame modules 4. Each first frame module 3 is connected to two inner ring first steel columns 21 and three outer ring second steel columns 22. The two second frame modules 4 are located at both ends of the central concourse 11, and each second frame module 4 is connected to two first steel columns 21 and two second steel columns 22.

[0058] The inner circle of the North Finger Corridor 13 is provided with four second steel columns 22, and the outer circle is provided with five second steel columns 22. The inner and outer circles of the South Finger Corridor 12 are provided with seven second steel columns 22. The second steel columns 22 are connected by second frame modules 4, so that the North Finger Corridor 13 and the South Finger Corridor 12 are spliced ​​together by the second frame modules 4. The North Finger Corridor 13, the South Finger Corridor 12 and the Middle Finger Corridor 11 form a linear extension structure with a natural arc connection.

[0059] like Figure 4 and Figure 8 The first frame module 3 includes five first steel columns 21, two of which are located in the inner circle of the middle concourse 11 and three of which are located in the outer circle of the middle concourse 11. The first steel columns 21 in the outer circle are connected by cantilever beams 31. The two first steel columns 21 in the inner circle are connected by a first steel truss 32. A truss connecting frame 33 is provided at the midpoint of the first steel truss 32. The truss connecting frame 33 is provided with two truss connecting ports 331.

[0060] The first frame module 3 also includes a first connecting joint 34, which is provided with four first connecting interfaces 343 arranged in an X shape. The included angle between the two first connecting interfaces 343 facing the outer circle is the first included angle 341, and the included angle between the two first connecting interfaces 343 facing the inner circle is the second included angle 342. The angles of the first included angle 341 and the second included angle 342 gradually increase from the central area of ​​the middle concourse 11 to the ends of the south concourse 12 and the north concourse 13, so that the middle concourse 11 and the south concourse 12 and the north concourse 13 smoothly transition to form a fan-shaped irregular structure. This ensures that the force direction at each first connecting joint 34 is highly consistent with the overall load transfer path of the structure, effectively avoiding the problem of local stress concentration. This makes the interface alignment more accurate when the module is spliced, eliminating the need for additional on-site adjustment of the component posture, further improving the efficiency and accuracy of the modular assembly of the irregular roof, and ensuring the visual integrity and structural stability of the fan-shaped outline.

[0061] Each third interface 213 and each truss connection 331 is connected to a second steel truss 35, so that each first connection joint 34, together with the surrounding steel columns and truss connection frame 33, forms a four-point supported X-shaped spatial force unit. This unit distributes the vertical load to the surrounding steel columns through the second steel truss 35, while enhancing the lateral stiffness between the two rows of steel columns, effectively suppressing the lateral deformation of the structure under horizontal loads, and further improving the overall structural stability and wind and earthquake resistance of the fan-shaped arched roof. At the same time, this X-shaped arrangement can also adapt to the gradual change requirements of the fan-shaped contour, allowing the length and angle of the second steel truss 35 to adjust naturally with the extension of the concourse, without the need for additional cutting or adjustment of component dimensions, ensuring the precision and efficiency of modular assembly.

[0062] A reinforcing rod 36 connects the truss connector to the opposite first steel column 21. A rhomboid steel frame 37 connects the two opposite first steel columns 21. Several rows of connecting rods 38 are set on the reinforcing rod 36. The connecting rods 38 are perpendicular to the reinforcing rod 36. The connecting rods 38 connect the second steel truss 35, the reinforcing rod 36, and the rhomboid steel frame 37 to form a lateral constraint system, further limiting the lateral displacement of the second steel truss 35 and improving the overall structural strength of the first frame component. In conjunction with the rhomboid steel frame 37, the vertical load is converted into a two-way axial force through the diagonal cross support, effectively improving the shear and torsional resistance of the first frame module 3. This ensures a more uniform force transmission between the inner and outer steel columns, so that when the first frame module 3 bears a large-span roof load, all components work together to avoid structural damage caused by excessive local stress, providing a solid guarantee for the stability of the fan-shaped arched roof.

[0063] like Figure 1 and Figure 5 The south concourse 12 and the north concourse 13 are assembled from the second frame modules 4. The second frame modules 4 connect the two second steel columns 22 in the inner ring and the two second steel columns 22 in the outer ring. The two second steel columns 22 in the same row are connected by cantilever beams 31. The two opposite second steel columns 22 are connected by frame beams 41. Cross steel beams 42 are set on the second frame modules 4. The cross steel beams 42 are set in an X shape between the second frame modules 4 and are connected to secondary beams 43. The secondary beams 43 are parallel to the cantilever beams 31. The frame beams 41 and the secondary beams 43 form a grid-like support system, which evenly transfers the roof load to the steel columns on both sides.

[0064] A third steel column 23 and a fourth steel column 24 are set on the ground inside the inner ring of the embedded plate 1. All the third steel columns 23 and the fourth steel columns 24 are arranged in a row. There are four fourth steel columns 24 and six third steel columns 23. The six third steel columns 23 are located on both sides of the four fourth steel columns 24. Each third steel column 23 and the top of the fourth steel column 24 are provided with two first interfaces 211 and two second interfaces 212. The third steel columns 23 and the fourth steel columns 24 are provided with a third frame module 5 on the adjacent row of first steel columns 21 and second steel columns 22. The third frame module 5 is precisely connected to each steel column. A second connecting joint 52 is connected between two adjacent third frame modules 5, and splicing is achieved through the second connecting joint 52 to form the supporting skeleton of the main building 14 area.

[0065] like Figure 3The first steel column 21, the second steel column 22, the third steel column 23, and the fourth steel column 24 are all equipped with cross stiffening plates 214. The cross stiffening plates 214 are set along the height direction of each steel column and are welded and fixed to the inner wall of the steel column. The thickness of the bottom end plate is consistent with the thickness of the corresponding steel column wall, which effectively enhances the rigidity of the steel column. At the same time, temporary diagonal braces 215 are set around the steel column to jointly suppress the local buckling deformation of the steel column under axial pressure or horizontal load, and improve the torsional performance of the steel column. This ensures that each steel column maintains structural integrity and stability when bearing the complex load transmitted by the fan-shaped arch structure, and provides a reliable vertical support foundation for the entire roof system.

[0066] like Figure 6 and Figure 8 The cantilever beam 31 is connected between the two first steel columns 21 on the outer ring of the third frame module 5 and between the two fourth steel columns 24 on the inner ring. The third frame module 5 is provided with a third steel truss 51. One end of each third steel truss 51 is connected to a first steel column 21 or a fourth steel column 24, and the other end of the third steel truss 51 is connected to a second connecting joint 52. The second connecting joint 52 is provided with four first connecting interfaces 343, two second connecting interfaces 521 and six third connecting interfaces 522.

[0067] The third steel truss 51 includes an upper chord 511, a lower chord 512, and a web member 513. One end of the upper chord 511 is connected to the third interface 213 of the first steel column 21, and the other end is connected to the first interface 343 of the second connecting joint 52. One end of the lower chord 512 is connected to the first interface 211 of the first steel column 21, and the other end is connected to the lower chord 512 of the opposite third steel truss 51. The second connecting joint 521 is connected to a reinforcing rod 36, and the end of the reinforcing rod 36 away from the second connecting joint 52 is connected to the cantilever beam 31. The third connecting joint 522 is connected to the web member 513.

[0068] like Figure 1 The first frame module 3 and the third frame module 5 are connected by a skylight 15. The skylight 15 uses the inner steel column of the first frame module 3 and the outer steel column of the third frame module 5 as the connection base. It is spliced ​​together by several second frame modules 4. The second frame modules 4 of the skylight 15 are provided with diamond-shaped cross bars 151. The diamond-shaped cross bars 151 and the cross steel beams 42 are spaced apart to form a grid-like frame structure.

[0069] like Figure 7A lattice column 6 is provided below the first connecting joint 34 and the second connecting joint 52. The column body of the lattice column 6 is spliced ​​together with uprights 61, horizontal bars 62 and diagonal bars 63. The uprights 61 and horizontal bars 62 are spliced ​​together to form an integral frame structure. The diagonal bars 63 connect the diagonals between the uprights 61 and the horizontal bars 62 to improve the overall structural strength. The top and bottom of the lattice column 6 are provided with node plates 64 as connection foundations. The node plates 64 are provided with reinforcing ribs 641, which are set along the length of the uprights 61 and perpendicular to the node plates 64. The bottom of the lattice column 6 is provided with a transfer beam 65 and the top is provided with an adjusting steel plate 66. The adjusting steel plate 66 can compensate for the distance between the lattice column 6 and the first connecting joint 34 or the second connecting joint 52.

[0070] The temporary lattice column 6 provides temporary support for the first connecting joint 34 and the second connecting joint 52. The top adjusting steel plate 66 is used to precisely adapt to the elevation error at the bottom of the joint, ensuring that the splicing surfaces are at the same horizontal reference and avoiding support deviation caused by height difference. The reinforcing ribs 641 on the node plate 64 enhance the local stiffness of the support point and evenly distribute the concentrated load transmitted by the joint to the entire lattice column 6, preventing the support structure itself from buckling and deforming.

[0071] The implementation principle of this application embodiment is as follows: First, the foundation fixing of the first steel column 21, the second steel column 22, the third steel column 23 and the fourth steel column 24 is completed by the precise docking of the embedded plate 1 with the conversion support and the spherical support 16. The setting of the cross stiffening plate 214 strengthens the rigidity of the steel column itself and provides a stable support benchmark for subsequent module assembly.

[0072] Secondly, the prefabricated first frame module 3, second frame module 4 and third frame module 5 are transported to the site. The differentiated interfaces of the first connecting joint 34 and the second connecting joint 52 are precisely matched with the interfaces of the corresponding steel columns. The standardized assembly system enables the rapid splicing of each module. The arc-shaped arrangement of the steel columns and the symmetrical interface arrangement ensure that the modules are naturally connected into a fan-shaped structure, avoiding on-site angle adjustments.

[0073] Subsequently, the skylight module 15 between the central concourse 11 and the main building 14 was installed, and the three were connected as a whole using the existing steel column components as connection points. At the same time, a lattice column 6 with an adjustable steel plate 66 was set below the key joint for temporary support to compensate for elevation errors and ensure splicing stability.

[0074] Finally, after the entire building is completed, the temporary lattice column 6 is removed. The first frame module 3, the second frame module 4, and the third frame module 5 work together to form a three-dimensional spatial force system, which effectively disperses the load and suppresses lateral deformation. Each module and the steel column work together to bear the force, ultimately achieving efficient, precise, and safe construction of the irregular roof, meeting the functional and visual requirements of large public buildings.

[0075] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modular steel truss structure resembling a fan-shaped arch, characterized in that: Includes a pre-embedded plate (1), on which a plurality of first steel columns (21) and a plurality of second steel columns (22) are provided. A first frame module (3) is connected to the first steel column (21), and a second frame module (4) is connected to the second steel column (22). A first connecting joint (34) is provided between two adjacent first frame modules (3), between two adjacent second frame modules (4), and between adjacent first frame modules (3) and second frame modules (4), so that a plurality of first frame modules (3) are spliced ​​together to form a middle finger corridor (11), and a plurality of second frame modules (4) are spliced ​​together to form a south finger corridor (12) and a north finger corridor (13), while making the middle finger corridor (11) interconnected with the south finger corridor (12) and the north finger corridor (13); It also includes a third steel column (23) and a fourth steel column (24). The third steel column (23) and the fourth steel column (24) are connected to the first steel column (21) and the second steel column (22) by a third frame module (5). Several third frame modules (5) are spliced ​​together to form the main building (14). The central concourse (11) is connected to the main building (14) by a skylight (15).

2. The fan-shaped arch-shaped modular steel truss structure according to claim 1, characterized in that: The top of the first steel column (21) is provided with a first interface (211) and two second interfaces (212) along its circumference. The included angle between the two second interfaces (212) is an obtuse angle on the same horizontal plane. Several first steel columns (21) located in the same row are arranged in an arc shape. Two third interfaces (213) are provided at the end of the first steel column (21) away from the first interface (211). The two second interfaces (212) and the two third interfaces (213) are symmetrically arranged about the center vertical line of the first interface (211). The third steel column (23) and the fourth steel column (24) are provided with two first interfaces (211) and two second interfaces (212). The two first interfaces (211) are located on both sides of the third steel column (23) and the fourth steel column (24), respectively. The two second interfaces (212) are spaced apart from the two first interfaces (211) and are symmetrical about the line connecting the two first interfaces (211). The included angle between the two second interfaces (212) is an obtuse angle on the same horizontal plane.

3. The fan-shaped arch-shaped modular steel truss structure according to claim 2, characterized in that: The first steel column (21) and the second steel column (22) below the central concourse (11) are arranged in two rows. The two rows of first steel columns (21) and second steel columns (22) are arranged in a fan shape. A first steel truss (32) is connected between two adjacent first steel columns (21) in the inner circle, and a cantilever beam (31) is connected between two adjacent first steel columns (21) in the outer circle. A truss connecting frame (33) is provided at the center of the first steel truss (32), and the truss connecting frame (33) is provided with two truss connecting ports (331).

4. The fan-shaped arch-shaped modular steel truss structure according to claim 3, characterized in that: The first connecting joint (34) includes four first connecting interfaces (343), each of which is opposite to a third interface (213) or a truss connecting port (331). A first angle (341) is formed between the two first connecting interfaces (343) facing away from the skylight (15), and a second angle (342) is formed between the two first connecting interfaces (343) facing the skylight (15). The angles of the first angle (341) and the second angle (342) gradually increase from the center of the middle concourse (11) toward the north concourse (13) and the south concourse (12) at both ends.

5. The fan-shaped arch-shaped modular steel truss structure according to claim 4, characterized in that: A second steel truss (35) is provided between the third interface (213) and the first connection interface (343), and between the truss connection port (331) and the first connection interface (343), so that each first connection joint (34) is connected to four second steel trusses (35), and the four second steel trusses (35) are arranged in an X shape between the two rows of first steel columns (21) and second steel columns (22).

6. The fan-shaped arch-shaped modular steel truss structure according to claim 5, characterized in that: A reinforcing rod (36) is connected between the first steel column (21) and its opposite first truss connecting frame (33). Several rows of connecting rods (38) are passed through the second steel truss (35). The several rows of connecting rods (38) are arranged parallel to the cantilever beam (31) and located between the cantilever beam (31) and the first steel truss (32).

7. The fan-shaped arch-shaped modular steel truss structure according to claim 6, characterized in that: The first steel column (21) in the third frame module (5) is connected to the third steel truss (51), and the four third steel trusses (51) are connected to the second connecting joint (52). The second connecting joint (52) includes a second connecting interface (521) and a third connecting interface (522). The third steel truss (51) includes an upper chord (511), a lower chord (512), and a web member (513). One end of the upper chord (511) is connected to the first steel column (21), and the other end is connected to the first connection interface (343). One end of the lower chord (512) is connected to the first steel column (21), and the other end is connected to the lower chord (512) of the adjacent third steel truss (51). The second connecting joint (52) is connected to a connecting rod (38), and the end of the connecting rod (38) away from the second connecting joint (52) is connected to the cantilever beam (31). The third connecting interface (522) is connected to the web member (513).

8. The fan-shaped arch-shaped modular steel truss structure according to claim 7, characterized in that: A lattice column (6) is provided below both the first connecting joint (34) and the second connecting joint (52) as a temporary support. The lattice column (6) includes four uprights (61), and several horizontal bars (62) and diagonal bars (63) are connected between the four uprights (61). The top and bottom of the uprights (61) are provided with node plates (64). Several reinforcing ribs (641) are provided on the node plates (64) around the uprights (61). The reinforcing ribs (641) are perpendicular to the node plates (64). A conversion beam (65) is provided at the bottom of the lattice column (6), and an adjusting steel plate (66) is provided at the top of the lattice column (6).

9. The fan-shaped arch-shaped modular steel truss structure according to claim 1, characterized in that: The first steel column (21), the second steel column (22), the third steel column (23) and the fourth steel column (24) are all provided with cross stiffening plates (214). The cross stiffening plates (214) are arranged along the height direction of the supporting steel column assembly and are welded and fixed to the inner wall of the supporting steel column. The end plate of the cross stiffening plate (214) has the same thickness as the column wall of the supporting steel column.

10. A construction method for a fan-shaped arch-shaped modular steel truss, applied to the fan-shaped arch-shaped modular steel truss structure described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Prefabricate several sets of first frame modules (3), second frame modules (4) and third frame modules (5), and install embedded plates (1) in the preset area, install first steel columns (21) and second steel columns (22) on the embedded plates (1), and install third steel columns (23) and fourth steel columns (24) on the ground; S2: Connect the cantilever beam (31) and the first steel truss (32) between adjacent steel columns; S3: The prefabricated module is hoisted onto the corresponding steel column and connected to the prefabricated module through the third interface (213) at the top of the steel column. Two adjacent prefabricated modules are spliced ​​together through the first connecting joint (34) or the second connecting joint (52) to form a fan-shaped roof frame module. At the same time, temporary lattice columns (6) are set below the first connecting joint (34) and the second connecting joint (52) for temporary support. S4: Connect the skylight (15) between the central concourse (11) and the main building (14). The skylight (15) uses the components of the central concourse (11) and the main building (14) as connection points, so that the three are connected to form an overall frame structure. S5: Remove the temporary lattice columns after construction is completed (6).

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