Steel structure and construction method

Abstract

The invention relates to a steel structure and a construction method, and relates to the technical field of steel structures. The steel structure comprises a primary truss, a secondary truss and a connecting node. The secondary trusses comprise upper chords and lower chords, and web members for connection are arranged between the upper chords and the lower chords; and the primary truss is respectively connected with the upper chord and the lower chord of the secondary truss. The connecting nodes comprise upper chord nodes used for connecting the main truss with the upper chord members of the secondary truss and lower chord nodes used for connecting the main truss with the lower chord members of the secondary truss. The upper chord node comprises a connecting plate and a stiffening plate, one end of the connecting plate is fixedly arranged on the primary truss, and the end, away from the primary truss, of the connecting plate is installed on the upper chord of the secondary truss; the stiffening plate is fixedly arranged at the position, close to the connecting plate, of the main truss, and the stiffening plate is fixedly connected with the connecting plate. According to the steel structure, the welding workload of overall construction is low, so that the risk of residual stress or deformation of the steel structure caused by unstable welding quality is reduced, and the construction process is simple and easy to operate.

Description

Technical Field

[0001] This application relates to the technical field of steel structures. Specifically, it relates to a steel structure and a construction method thereof. Background Art

[0002] For some special large-span steel structures, according to the requirements of building functions, the structural form and the cross-sectional form of components are relatively complex. The design of the connection nodes between components is an important factor affecting the structural safety. Unreasonable node design may lead to problems such as stress concentration in the structure and insufficient member strength, thus affecting the overall safety performance of the structure.

[0003] In the related art, traditional welding methods are usually adopted. In this way, although the strength can meet the requirements, the welding workload at the construction site is large, the welding quality is not easy to guarantee, and welding will also bring problems of residual stress and deformation. In addition, when the cross-sections of the main truss and the secondary truss are special-shaped cross-sections, it is also difficult to directly adopt welding or hinged methods between components, and additional support structures need to be set up to connect each component, which not only increases the construction complexity but also increases the material cost. Summary of the Invention

[0004] In order to solve at least some of the defects mentioned in the related art, this application provides a steel structure and a construction method thereof.

[0005] To achieve the above object, this application provides a steel structure, including a main truss, a secondary truss, and connection nodes. The secondary truss includes an upper chord and a lower chord, and web members for connection are arranged between the upper chord and the lower chord; the main truss is respectively connected to the upper chord and the lower chord of the secondary truss. The connection nodes include an upper chord node for connecting the main truss and the upper chord, and a lower chord node for connecting the main truss and the lower chord. The upper chord node includes a connecting plate and a stiffening plate. One end of the connecting plate is fixedly arranged on the main truss, and the end of the connecting plate far from the main truss is mounted on the upper chord; the stiffening plate is fixedly arranged on the main truss at a position close to the connecting plate, and the stiffening plate is fixedly connected to the connecting plate.

[0006] Furthermore, the upper chord is arranged as an arc structure, and the arc structure includes a first arc rod and a second arc rod. The first arc rod and the second arc rod are arranged in parallel, and connecting members for fixing each other are arranged between the first arc rod and the second arc rod. A gap is arranged between the first arc rod and the second arc rod at a position close to the upper chord node, and the connecting plate extends into the gap.

[0007] Further, the connecting plate includes a first connecting plate and a second connecting plate. One end of the first connecting plate is fixedly arranged on the main truss, and the end of the first connecting plate far from the main truss extends into the gap.

[0008] The second connecting plate is arranged in the gap and is located between the first arc-shaped rod or the second arc-shaped rod and the first connecting plate. Both the first arc-shaped rod and the second arc-shaped rod are mounted on the first connecting plate through the second connecting plate.

[0009] Further, the stiffening plate includes a first stiffening plate and a second stiffening plate. The first stiffening plate is arranged at a position close to the main truss on one side of the connecting plate, and the first stiffening plate is perpendicular to the connecting plate and extends in a direction away from the connecting plate.

[0010] The second stiffening plate is arranged at the side of the connecting plate far from the first stiffening plate, and the second stiffening plate is arranged in the same way as the first stiffening plate.

[0011] Further, both the first stiffening plate and the second stiffening plate are symmetrically arranged on two side surfaces of the connecting plate along the connecting plate.

[0012] Further, the lower chord node includes a third connecting plate, and the third connecting plate penetrates through the main truss.

[0013] Further, a connecting part is arranged on the main truss. The connecting part includes a connecting frame body and a reinforcing ear plate. The third connecting plate passes through the connecting frame body and is inserted into the main truss.

[0014] The reinforcing ear plate is filled between the third connecting plate and the connecting frame body, and the third connecting plate is fixedly connected to the ear plate and the connecting frame body.

[0015] Further, the lower chord rod is set as a straight rod, and the cross-section of the straight rod is box-shaped; the cross-section of the connecting frame body is the same as that of the lower chord rod of the secondary truss, and the flanges and webs of the connecting frame body are fixedly connected to the corresponding flanges and webs of the lower chord rod.

[0016] Further, one end of the web member is connected to the upper chord rod, and the end of the web member far from the upper chord rod is connected to the lower chord rod;

[0017] A plurality of the web members are arranged between the upper chord rod and the lower chord rod, and the plurality of web members are connected end to end in sequence.

[0018] This application also provides a construction method, which is used for installing the steel structure described in any one of the above embodiments. The construction method includes:

[0019] After the main truss is assembled, at least two assembled main trusses are hoisted to the corresponding positions. After the construction is completed, the construction of the secondary truss starts between the two main trusses;

[0020] A plurality of the web members are arranged between the upper chord member and the lower chord member and are installed by connecting head to tail in sequence to form the secondary truss. After the assembly is completed, the secondary truss is hoisted to the position to be constructed so that the secondary truss is located between the two main trusses;

[0021] The first connecting plate is inserted into the gap between the first arc-shaped rod and the second arc-shaped rod, and at least two second connecting plates are respectively inserted between the first connecting plate and the first arc-shaped rod and between the first connecting plate and the second arc-shaped rod. Then, bolts are sequentially passed through the first arc-shaped rod, the second connecting plate, the first connecting plate, the next second connecting plate, and the second arc-shaped rod and fixedly connected thereto;

[0022] The first stiffening plate and the second stiffening plate are respectively welded at appropriate positions on both side edges of the first connecting plate;

[0023] The third connecting plate is inserted into the connection frame body on the main truss and penetrates through the main truss; then the reinforcing ear plate is inserted between the third connecting plate and the connection frame body, and the connection frame body, the third connecting plate, and the reinforcing ear plate are fixedly connected by bolts;

[0024] Then, the lower chord member of the secondary truss is fixedly welded to the connection frame body;

[0025] Repeat the above steps until the steel structure construction is completed.

[0026] Through the above technical solution, after the main truss is installed at the appropriate position, the secondary truss is assembled and hoisted between the two main trusses. Then, the upper chord member of the secondary truss is fixedly installed on the main truss through the connecting plate, and the stiffening plate is simultaneously connected to the connecting plate and the main truss to play a role in reinforcement to ensure the connection effect; the lower chord member of the secondary truss is also fixedly installed on the main truss through the lower chord node.

[0027] In the steel structure of the present application, during the installation process, the main truss and the upper chord member of the secondary truss can be fixedly connected through the connecting plate and the stiffening plate, and the main truss and the lower chord member of the secondary truss are also fixedly connected through the lower chord node, reducing the overall welding workload of the construction, thereby reducing the risk of residual stress or deformation of the steel structure caused by unstable welding quality. In addition, in the steel structure of the present application, when connecting the main truss and the secondary truss, there is no need to provide additional support structures on the main truss or the secondary truss, ensuring that the construction process of the present application is simple and easy to operate.

[0028] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0029] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related accompanying drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of a perspective of the steel structure provided by the embodiment of the present application;

[0031] Figure 2 It is a schematic structural diagram of another perspective of the steel structure provided by the embodiment of the present application;

[0032] Figure 3 It is a schematic structural diagram of yet another perspective of the steel structure provided by the embodiment of the present application;

[0033] Figure 4 It is a schematic structural diagram of a perspective of the upper chord joint provided by the embodiment of the present application;

[0034] Figure 5 It is a schematic structural diagram of a perspective of the first connecting plate and the second connecting plate provided by the embodiment of the present application;

[0035] Figure 6 It is a schematic structural diagram of a perspective of the first stiffening plate provided by the embodiment of the present application;

[0036] Figure 7 It is a schematic structural diagram of a perspective of the second stiffening plate provided by the embodiment of the present application;

[0037] Figure 8 It is a schematic structural diagram of a perspective of the lower chord joint provided by the embodiment of the present application;

[0038] Figure 9 It is a schematic structural diagram of a perspective of the main truss and the third connecting plate provided by the embodiment of the present application;

[0039] Figure 10 It is a schematic structural diagram of a perspective of the third connecting plate provided by the embodiment of the present application;

[0040] Figure 11 It is a schematic structural diagram of a perspective of the connecting frame provided by the embodiment of the present application;

[0041] Figure 12 It is a schematic structural diagram of a perspective of the strengthening ear plate provided by the embodiment of the present application;

[0042] Figure 13 It is a schematic structural diagram of a perspective of the secondary truss provided by the embodiment of the present application;

[0043] Figure 14 This is a schematic cross-sectional view of the lower chord of the secondary truss provided by the embodiments of the present application.

[0044] Icon:

[0045] 100 - Main truss; 200 - Secondary truss; 210 - Upper chord; 211 - First arc-shaped rod; 212 - Second arc-shaped rod; 213 - Gap; 220 - Lower chord; 230 - Web member; 300 - Upper chord node; 310 - First connecting plate; 311 - Main plate; 312 - Sub-plate; 320 - Second connecting plate; 330 - First stiffening plate; 331 - First connecting edge; 340 - Second stiffening plate; 341 - Second connecting edge; 400 - Lower chord node; 410 - Third connecting plate; 420 - Reinforcing ear plate; 430 - Connecting frame. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0047] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0049] The present application provides a steel structure to solve the problems in the related art, such as a large amount of welding in the connection between the main truss and the secondary truss, and the need for additional support structures, which may lead to cumbersome construction operations and increased material consumption.

[0050] Please refer toFigures 1 to 3 , a steel structure, including a main truss 100, a secondary truss 200 and connection nodes. The secondary truss 200 includes an upper chord 210 and a lower chord 220, and web members 230 for connection are arranged between the upper chord 210 and the lower chord 220; the main truss 100 is respectively connected to the upper chord 210 and the lower chord of the secondary truss 200. The connection nodes include an upper chord node 300 for connecting the main truss 100 and the upper chord 210, and a lower chord node 400 for connecting the main truss 100 and the lower chord 220 of the secondary truss 200. The upper chord node 300 includes a connecting plate and a stiffening plate. One end of the connecting plate is fixedly arranged on the main truss 100, and the end of the connecting plate far from the main truss 100 is installed on the upper chord 210; the stiffening plate is fixedly arranged on the main truss 100 at a position close to the connecting plate, and the stiffening plate is fixedly connected to the connecting plate.

[0051] Specifically, when installing the steel structure of this embodiment, the main truss 100 is installed at a suitable position, and then the lower chord 220 and the upper chord 210 of the secondary truss 200 are connected by the web members 230 to complete the assembly of the secondary truss 200. After the assembly of the secondary truss 200 is completed, the secondary truss 200 is hoisted between the two main trusses 100 so that both ends of the secondary truss 200 can be connected to the main truss 100.

[0052] Both sides of the cross-section of the upper chord 210 and the lower chord 220 of the secondary truss 200 are connected to the main truss 100. Among them, at the position of the main truss 100 close to the upper chord 210 of the secondary truss 200, a connecting plate is provided, and the end of the connecting plate far from the main truss 100 is fixedly connected to the secondary truss 200, so that the main truss 100 and the secondary truss 200 are connected through the connecting plate. Then, the stiffening plate is arranged at the position of the main truss 100 close to the connecting plate, and the stiffening plate is fixedly connected to the connecting plate, so as to further improve the connection strength between the connecting plate and the main truss 100, which is equivalent to improving the connection strength between the main truss 100 and the upper chord 210 of the secondary truss 200. At the position of the main truss 100 close to the lower chord 220 of the secondary truss 200, it is also fixedly connected to the lower chord 220 of the secondary truss 200 through the lower chord node 400.

[0053] In the steel structure of this embodiment, during the installation process, the connection reliability and connection strength between the upper chord 210 of the main truss 100 and the secondary truss 200 can be ensured through the connecting plate and the stiffening plate, and the lower chord joint 400 can also ensure the connection between the lower chord 220 of the main truss 100 and the secondary truss 200. In the related art, when the main truss 100 and the secondary truss 200 are connected, a large amount of welding is required between the upper chords 210 of the main truss 100 and the secondary truss 200 and between the lower chords 220 of the main truss 100 and the secondary truss 200. Compared with the related art, this embodiment reduces the welding amount during the construction of the main truss 100 and the secondary truss 200, and thus reduces the probability of residual stress or deformation in the steel structure due to inconsistent welding quality, ensuring the connection quality of this embodiment.

[0054] In addition, in this embodiment, since both the main truss 100 and the secondary truss 200 are members with special-shaped cross-sections, in the related art, it is usually necessary to additionally set up support members to support the main truss 100 or the secondary truss 200 during connection to ensure accurate welding positions and reliable welding quality. However, in this embodiment, when connecting the main truss 100 and the secondary truss 200, the connection can be achieved through the gusset plate, without the need to additionally set up other support members to support the main truss 100 and the secondary truss 200, reducing the complexity of the construction process, making this embodiment easy to operate during construction, and also reducing the material consumption.

[0055] In one embodiment, by way of example, as Figures 4 to 7 shown, the upper chord 210 is arranged as an arc structure, and the arc structure includes a first arc bar 211 and a second arc bar 212. The first arc bar 211 and the second arc bar 212 are arranged in parallel, and a connecting member for fixing each other is provided between the first arc bar 211 and the second arc bar 212. A gap 213 is provided between the first arc bar 211 and the second arc bar 212 near the upper chord joint 300, and the connecting plate extends into the gap 213. By arranging the upper chord 210 of the secondary truss 200 as a double-layer arc structure and making the connecting plate extend into its gap 213, the connection tightness and stability between the main truss 100 and the secondary truss 200 can be increased. This design makes the connection point not only rely on the surface welding or fixing method, but also enhances the rigidity and anti-deformation ability of the overall structure through the physical embedding method.

[0056] Compared with the traditional full-welding method, this method reduces the welding amount and reduces the risk of residual stress and deformation caused by welding. At the same time, since the connecting plate is directly embedded into the designed gap 213, the installation process can be simplified to a certain extent, especially in the case of this special-shaped long-span steel structure in this embodiment, which can effectively improve the construction efficiency and connection quality.

[0057] It can be understood that the connecting plate can be fixed to the first arc-shaped rod 211 and the second arc-shaped rod 212 in any way other than welding, as long as the connection strength can be ensured. Exemplarily, threaded holes are provided on the connecting plate, the first arc-shaped rod 211, and the second arc-shaped rod 212, and the connecting plate connects and reliably fixes the first arc-shaped rod 211 and the second arc-shaped rod 212 through bolts.

[0058] Furthermore, the first arc-shaped rod 211 and the second arc-shaped rod 212 are not completely separated. A connecting member for fixed connection is provided between them, so that the first arc-shaped rod 211 and the second arc-shaped rod 212 form an integral body, thereby improving the overall structural strength of the secondary truss 200 and the structural rationality of this embodiment.

[0059] In one embodiment, exemplarily, as Figures 4 to 7 shown, the connecting plate includes a first connecting plate 310 and a second connecting plate 320. One end of the first connecting plate 310 is fixedly arranged on the main truss 100, and the end of the first connecting plate 310 far from the main truss 100 extends into the gap 213. The second connecting plate 320 is arranged in the gap 213 and is located between the first arc-shaped rod 211 or the second arc-shaped rod 212 and the first connecting plate 310. Both the first arc-shaped rod 211 and the second arc-shaped rod 212 are mounted on the first connecting plate 310 through the second connecting plate 320.

[0060] Specifically, in this embodiment, since the upper chord 210 of the secondary truss 200 is assembled by the first arc-shaped rod 211 and the second arc-shaped rod 212, in order to ensure the strength of the upper chord 210 of the secondary truss 200 and even the entire secondary truss 200, other connecting members or strengthening members need to be provided between the first arc-shaped rod 211 and the second arc-shaped rod 212. Therefore, there are requirements for the gap 213 between the first arc-shaped rod 211 and the second arc-shaped rod 212, which need to ensure that the strengthening members can be normally installed and also make the construction convenient during the installation of this embodiment.

[0061] By providing the first connecting plate 310 and the second connecting plate 320, not only can the thickness of the second connecting plate 320 be controlled, so that the thickness of the first connecting plate 310 and the second connecting plate 320 can adapt to the size of the gap 213 between the first arc-shaped rod 211 and the second arc-shaped rod 212, but also the strength and stiffness of the node can be increased, thereby improving the overall reliability of the upper chord node 300. Especially when the second connecting plate 320 is located between the first arc-shaped rod 211 or the second arc-shaped rod 212 and the first connecting plate 310, this connection is further strengthened, making the structure more stable when bearing loads.

[0062] Such a design also helps to optimize the force transmission path, so that the external force can be more evenly distributed between the first connecting plate 310, the second connecting plate 320 and the upper chord 210 of the secondary truss 200. It not only improves the bearing capacity of the structure, but also reduces the risk of local stress concentration, thereby extending the service life of the steel structure of this embodiment. Compared with traditional full welding or other complex connection methods, this double connecting plate design makes on-site installation easier, without the need for a large number of additional supports or complex calibration work, and reduces the difficulty and cost of construction.

[0063] Similarly, in this embodiment, the connection between the first arc rod 211, the second arc rod 212, the first connecting plate 310, and the second connecting plate 320 can be any connection method other than welding, as long as the strength requirements can be met, such as bolt connection, pin connection, clamping, etc.

[0064] It should be noted that the first connecting plate 310 includes a main plate 311 and a secondary plate 312, wherein two secondary plates 312 are provided, and the two secondary plates 312 are respectively fixedly provided on both sides of the main plate 311. In addition, the thickness of the main plate 311 is greater than the thickness of the secondary plate 312, thereby ensuring the overall strength and structural rigidity of the first connecting plate 310.

[0065] In one embodiment, for example, Figure 4 , Figure 6 , Figure 7 As shown, the stiffening plate includes a first stiffening plate 330 and a second stiffening plate 340. The first stiffening plate 330 is arranged at a side edge of the connecting plate near the main truss 100, and the first stiffening plate 330 is perpendicular to the connecting plate and extends in a direction away from the connecting plate. The second stiffening plate 340 is arranged at a side edge of the connecting plate away from the first stiffening plate 330, and the second stiffening plate 340 is arranged in the same manner as the first stiffening plate 330. By arranging the first stiffening plate 330 on one side edge of the connecting plate and the second stiffening plate 340 on a side away from the first stiffening plate 330, the connection stiffness between the connecting plate and the main truss 100 can be effectively increased. This double-sided stiffening design can make the entire structure more stable when subjected to force, can withstand various complex load conditions, and increase the bending stiffness of the upper chord node 300.

[0066] The first stiffening plate 330 and the second stiffening plate 340 are respectively perpendicular to the connecting plate and extend away from the connecting plate. Such a layout helps to more evenly distribute the load applied to the connecting plate and avoid structural failure problems caused by local stress concentration. This not only improves the bearing capacity of the node, further improves the bending stiffness of the upper chord node 300, but also extends its service life. The presence of the stiffening plate can also help to better fix the position of the connecting plate, especially providing additional positioning support during the installation process to ensure that the connecting plate, the upper chord rod 210 of the secondary truss 200 and the main truss 100 can be accurately aligned to reduce errors.

[0067] It is worth mentioning that in this embodiment, the first connecting plate 310 is inclined relative to the first arc rod 211 and the second arc rod 212. Specifically, the top surface of the main truss 100 and the end surface of the upper chord 210 of the secondary truss 200 are relatively inclined, and the first connecting plate 310 is inclined on the top surface of the main truss 100. The inclination angle can be flexibly adjusted according to design requirements, so that the first connecting plate 310 can better adapt to the actual stress conditions of the structure. This arrangement allows the force to be transmitted along a more natural and direct path, reducing energy loss or stress concentration caused by angle mismatch, thereby improving the bearing capacity and stability of the entire structure.

[0068] More specifically, if Figure 6 , Figure 7 As shown, the first stiffening plate 330 is fixedly connected to the first connecting plate 310 via the first connecting edge 331 . The second stiffening plate 340 is fixedly connected to the first connecting plate 310 via the second connecting edge 341 .

[0069] Please continue reading Figures 4 to 7 Exemplarily, the first stiffening plate 330 and the second stiffening plate 340 are symmetrically arranged on the two sides of the connecting plate along the connecting plate. The symmetrically arranged stiffening plates can provide uniform support force on both sides of the connecting plate, so that the connecting plate can maintain balance when bearing loads, avoiding deformation or instability caused by unilateral force. This design helps to improve the rigidity and stability of the node as a whole. By arranging the stiffening plates symmetrically on both sides of the connecting plate, the external force can also be more evenly distributed on the connecting plate and its connection with the upper chord 210 of the main truss 100 and the secondary truss 200, optimizing the force transmission path, reducing local stress concentration, and thus improving the safety performance of the entire structure.

[0070] In addition, the symmetrical design not only facilitates design standardization, but also simplifies the manufacturing and installation process. Since the stiffeners on both sides have the same design parameters and installation methods, the need for customized parts can be reduced, production costs can be reduced, and it is conducive to rapid on-site assembly.

[0071] In one embodiment, by way of example, as Figures 8 to 12 shown, the lower chord node 400 includes a third connecting plate 410 which is disposed through the main truss 100. By making the third connecting plate 410 penetrate the entire main truss 100, the overall structural strength of the lower edge portion of the main truss 100 can be significantly improved. In this way, after the main truss 100 is connected to the lower chord member 220, the overall connection strength will also be more reliable. This connection method not only provides a direct mechanical connection, but also increases the contact area, helps to disperse stress, and reduces the risk of local deformation or damage.

[0072] Furthermore, the penetrating design of the third connecting plate 410 enables the load to be transferred from the lower chord member 220 of the secondary truss 200 to the main truss 100 more directly and evenly, reducing energy loss and potential stress concentration points, and enhancing the joint stiffness. This also helps to improve the overall structural stability and load-bearing capacity, especially in the application scenario of this special-shaped long-span steel structure that needs to bear a large load, where the stability is more obvious.

[0073] Moreover, compared with complex welding or other connection techniques, the design of the penetrating connecting plate can simplify the on-site installation process. Since the connecting plate has been pre-positioned and penetrates the main truss 100, during actual construction, the main truss 100 and the secondary truss 200 can be directly fixed through the connection joint, reducing the workload of on-site adjustment and calibration and improving the construction efficiency.

[0074] In one embodiment, by way of example, as Figures 8 to 12 shown, a connecting portion is provided on the main truss 100. The connecting portion includes a connecting frame body 430 and a reinforcing ear plate 420. The third connecting plate 410 passes through the connecting frame body 430 and is inserted into the main truss 100; the reinforcing ear plate 420 is filled between the third connecting plate 410 and the connecting frame body 430, and the third connecting plate 410 is fixedly connected to the ear plate and the connecting frame body 430. By using the connecting frame body 430 and the reinforcing ear plate 420, the connection strength and rigidity between the third connecting plate 410 and the main truss 100 can be significantly increased. The reinforcing ear plate 420 fills the gap between the third connecting plate 410 and the connecting frame body 430, making the connection more tightly and firmly, reducing the risk of loosening caused by vibration or external force. The reinforcing ear plate 420 also helps to evenly disperse the load applied on the third connecting plate 410, avoiding local stress concentration. This enables the third connecting plate 410 to more effectively transfer the external load from the lower chord member 220 to the main truss 100, improving the load-bearing capacity of the entire joint and extending the service life of this embodiment.

[0075] The connecting frame 430 can provide precise guidance and positioning functions for the third connecting plate 410, ensuring that it can pass through and be fixed at the predetermined position accurately without error. This not only simplifies the installation process but also ensures the precise alignment between components, reducing errors. When fixing the third connecting plate 410 to the connecting frame 430, various fixing methods can be used, such as welding and bolts, to firmly combine the third connecting plate 410 with the ear plate and the connecting frame 430, increasing the durability and reliability of the joint. Even when used in a harsh environment for a long time, it can maintain good performance and reduce the maintenance frequency.

[0076] In one embodiment, by way of example, such as Figure 1 , Figure 3 , Figure 13 , Figure 14 shown, the lower chord 220 is set as a straight rod, the cross-section of the straight rod is box-shaped, the cross-section of the connecting frame 430 is the same as that of the lower chord 220 of the secondary truss 200, and the flanges and webs of the connecting frame 430 are fixedly connected to the corresponding flanges and webs of the lower chord 220 of the secondary truss 200. The box-shaped cross-section design of the lower chord 220 of the secondary truss 200 itself has high bending and torsional resistance properties, thus significantly enhancing the overall rigidity and load-bearing capacity of the lower chord 220 of the secondary truss 200. This not only reduces the risk of excessive local deformation or instability of the member but also improves the overall stability of the structure.

[0077] The lower chord 220 of the secondary truss 200 is fixedly connected to the connecting frame 430 by welding or other fixing methods, that is, the lower chord 220 of the secondary truss 200 is fixedly connected to the main truss 100 reliably, ensuring that the force is transmitted more directly and efficiently between the lower chord 220 of the secondary truss 200 and the main truss 100, and avoiding possible stress concentration problems.

[0078] In one embodiment, by way of example, such as Figure 13 shown, one end of the web member 230 is connected to the upper chord 210, and the end of the web member 230 far from the upper chord 210 is connected to the lower chord 220. There are multiple web members 230 between the upper chord 210 and the lower chord 220, and the multiple web members 230 are connected end to end in sequence. By setting multiple web members 230 and connecting them end to end, the overall rigidity and stability of the secondary truss 200 can be significantly improved. The existence of the web member 230 not only supports the upper chord 210 and the lower chord 220 of the secondary truss 200 but also enhances the interaction between them, making the whole structure more stable.

[0079] It is worth mentioning that in this embodiment, since the upper chord 210 of the secondary truss 200 is arranged as the first arc rod 211 and the second arc rod 212 which are arranged in parallel, the ends of multiple web members 230 can all be installed in the gap 213 between the first arc rod 211 and the second arc rod 212, further improving the overall strength of the upper chord 210 of the secondary truss 200.

[0080] In addition, since the web members 230 form a triangular network support system between the upper chord 210 of the secondary truss 200 and the lower chord 220 of the secondary truss 200, this support system can greatly increase the load-bearing capacity of the structure. As a commonly used stable shape in engineering, the triangle can ensure that the secondary truss 200 can maintain good performance even when bearing a large load in this embodiment.

[0081] This application also provides a construction method, which is used to install the steel structure in any of the above embodiments. The construction method includes:

[0082] After the main truss 100 is assembled, at least two assembled main trusses 100 are hoisted to the corresponding positions. After the construction is completed, the construction of the secondary truss starts between the two main trusses.

[0083] A plurality of web members 230 are arranged between the upper chord 210 of the secondary truss 200 and the lower chord 220 of the secondary truss 200, and are installed in sequence end to end to form the secondary truss 200. After the assembly is completed, the secondary truss 200 is hoisted to the position to be constructed, so that the secondary truss 200 is located between the two main trusses 100.

[0084] The first connecting plate 310 is inserted into the gap 213 between the first arc rod 211 and the second arc rod 212, and at least two second connecting plates 320 are respectively inserted between the first connecting plate 310 and the first arc rod 211, and between the first connecting plate 310 and the second arc rod 212. Then, bolts are sequentially passed through the first arc rod 211, the second connecting plate 320, the first connecting plate 310, the next second connecting plate 320, and the second arc rod 212, and they are fixedly connected.

[0085] The first stiffening plate 330 and the second stiffening plate 340 are respectively welded at appropriate positions on both sides of the first connecting plate 310.

[0086] The third connecting plate 410 is inserted into the connecting frame 430 on the main truss 100 and penetrates the entire cross-section at the lower end of the main truss 100; then the strengthening ear plate 420 is inserted between the third connecting plate 410 and the connecting frame 430, and the connecting frame 430, the third connecting plate 410 and the strengthening ear plate 420 are fixedly connected by bolts.

[0087] After that, the lower chord 220 of the secondary truss 200 is welded and fixed to the connecting frame 430.

[0088] Repeat the above steps until the steel structure construction is completed.

[0089] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0090] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A steel structure, characterized in that: include: Main truss (100); A secondary truss (200), the secondary truss (200) comprising an upper chord (210) and a lower chord (220), a web member (230) for connection being provided between the upper chord (210) and the lower chord (220); the main truss (100) being connected to the upper chord (210) and the lower chord (220), respectively; A connection node, wherein the connection node comprises an upper chord node (300) for connecting the main truss (100) and the upper chord rod (210), and a lower chord node (400) for connecting the main truss (100) and the lower chord rod (220); The upper chord node (300) comprises a connecting plate and a stiffening plate, one end of the connecting plate is fixedly arranged on the main truss (100), and the end of the connecting plate away from the main truss (100) is installed on the upper chord rod (210); the stiffening plate is fixedly arranged on the main truss (100) at a position close to the connecting plate, and the stiffening plate is fixedly connected to the connecting plate.

2. The steel structure according to claim 1, characterized in that: The upper chord rod (210) is configured as an arc-shaped structure, the arc-shaped structure comprising a first arc-shaped rod (211) and a second arc-shaped rod (212), the first arc-shaped rod (211) and the second arc-shaped rod (212) being arranged in parallel; and a connecting piece for fixing the first arc-shaped rod (211) and the second arc-shaped rod (212) to each other is provided between the first arc-shaped rod (211) and the second arc-shaped rod (212); A gap (213) is provided between the first arc-shaped rod (211) and the second arc-shaped rod (212) at a position close to the upper chord node (300), and the connecting plate extends into the gap (213).

3. The steel structure according to claim 2, characterized in that: The connecting plate comprises a first connecting plate (310) and a second connecting plate (320), one end of the first connecting plate (310) is fixedly arranged on the main truss (100), and one end of the first connecting plate (310) away from the main truss (100) extends into the gap (213); The second connecting plate (320) is arranged in the gap (213) and is located between the first arc-shaped rod (211) or the second arc-shaped rod (212) and the first connecting plate (310); the first arc-shaped rod (211) and the second arc-shaped rod (212) are both mounted on the first connecting plate (310) via the second connecting plate (320).

4. The steel structure according to claim 1, characterized in that: The stiffening plate comprises a first stiffening plate (330) and a second stiffening plate (340), wherein the first stiffening plate (330) is arranged at a side edge of the connecting plate close to the main truss (100), and the first stiffening plate (330) is perpendicular to the connecting plate and extends in a direction away from the connecting plate; The second stiffening plate (340) is arranged at a side edge of the connecting plate away from the first stiffening plate (330), and the second stiffening plate (340) is arranged in the same manner as the first stiffening plate (330).

5. The steel structure according to claim 4, characterized in that: The first stiffening plate (330) and the second stiffening plate (340) are both symmetrically arranged on two side surfaces of the connecting plate along the connecting plate.

6. The steel structure according to claim 1, characterized in that: The lower chord node (400) comprises a third connecting plate (410), and the third connecting plate (410) penetrates the main truss (100).

7. The steel structure according to claim 6, characterized in that: The main truss (100) is provided with a connecting portion, the connecting portion comprising a connecting frame (430) and a reinforcing ear plate (420), and the third connecting plate (410) passes through the connecting frame (430) and is plugged into the main truss (100); The reinforcing ear plate (420) is filled between the third connecting plate (410) and the connecting frame (430), and the third connecting plate (410) is fixedly connected to the ear plate and the connecting frame (430).

8. The steel structure according to claim 7, characterized in that: The lower chord (220) is configured as a straight rod, and the cross section of the straight rod is box-shaped; The cross section of the connecting frame (430) is arranged to be identical to the cross section of the lower chord (220), and the flange and web of the connecting frame (430) are fixedly connected to the corresponding flange and web of the lower chord (220).

9. The steel structure according to claim 1, characterized in that: One end of the web member (230) is connected to the upper chord member (210), and one end of the web member (230) away from the upper chord member (210) is connected to the lower chord member (220); A plurality of web members (230) are arranged between the upper chord member (210) and the lower chord member (220), and the plurality of web members (230) are connected end to end in sequence.

10. A construction method, characterized in that: The construction method is used to install the steel structure according to any one of claims 1 to 9, and the construction method comprises: After the main trusses (100) are assembled, at least two of the assembled main trusses (100) are hoisted to corresponding positions, and then a secondary truss is constructed between the two main trusses; A plurality of web members (230) are arranged between the upper chord member (210) and the lower chord member (220), and are sequentially installed end to end to form the secondary truss (200); after the assembly is completed, the secondary truss (200) is hoisted to a location to be constructed, so that the secondary truss (200) is located between the two main trusses (100); The first connecting plate (310) is extended into the gap (213) between the first arc-shaped rod (211) and the second arc-shaped rod (212), and at least two second connecting plates (320) are respectively inserted between the first connecting plate (310) and the first arc-shaped rod (211), and between the first connecting plate (310) and the second arc-shaped rod (212), and then bolts are sequentially passed through the first arc-shaped rod (211), the second connecting plate (320), the first connecting plate (310), the next second connecting plate (320), and the second arc-shaped rod (212), and they are fixedly connected; Welding the first stiffening plate (330) and the second stiffening plate (340) at appropriate positions on both sides of the first connecting plate (310); The third connecting plate (410) is inserted into the connecting frame (430) on the main truss (100) and penetrates the main truss (100); then the reinforcing ear plate (420) is inserted between the third connecting plate (410) and the connecting frame (430), and the connecting frame (430), the third connecting plate (410) and the reinforcing ear plate (420) are fixedly connected by bolts; Then, the lower chord (220) and the connecting frame (430) are welded and fixed; Repeat the above steps until the steel structure construction is completed.

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