H-shaped stringer and method of manufacturing the same

Abstract

The application belongs to the technical field of steel truss girder, and particularly relates to an H-shaped chord and a manufacturing method thereof, which comprises an H-shaped steel, including an upper flange plate, a lower flange plate and a web plate; two connecting structures, each of which comprises a connecting wide plate, a node plate and multiple stiffening plates; an upper backing plate; a lower backing plate; and multiple reinforcing plates. By adopting the H-shaped steel as the main structure of the chord, the amount of steel can be greatly reduced under the premise of ensuring the structural strength, the material cost is reduced, and welding is not required, so that the construction process can be simplified, the construction period can be shortened, and the production cost can be reduced. By arranging the connecting wide plates on both sides of the upper flange plate, the specification of the H-shaped steel used can be reduced, the overall weight of the chord can be reduced, the amount of steel can be saved, the material cost can be further reduced, the spacing of the node plates can be ensured to meet the design requirements, and the like.

Description

Technical Field

[0001] This invention belongs to the field of steel truss technology, specifically relating to an H-shaped chord and its manufacturing method. Background Technology

[0002] Steel truss structures are widely used in bridges, buildings and other fields due to their high load-bearing capacity and spanning ability; among them, the steel truss chord is a key load-bearing component of the steel truss structure, and its structural form and connection method directly affect the overall performance of the bridge structure.

[0003] Currently, steel truss chords mostly adopt box-type structures and are connected to the web members through integral node construction. The chord body and node areas are usually manufactured using a fully welded process. The connections between chords mainly rely on high-strength bolt connections, welded connections, or bolt-welded combination connections.

[0004] However, existing steel truss chords suffer from problems such as large consumption of structural steel, complex construction processes, high manufacturing costs, and long construction periods, which cannot meet the needs of practical applications. Summary of the Invention

[0005] The purpose of this invention is to provide an H-type chord and its manufacturing method, which solves the technical problems of large amount of structural steel consumption, complex construction process, high manufacturing cost and long construction period in the prior art.

[0006] In a first aspect, the present invention discloses an H-type chord, comprising: H-beams, including upper flange, lower flange and web; Two connecting structures are symmetrically arranged on both sides of the H-beam; each connecting structure includes: A connecting plate is provided at the edge of the upper wing plate along the width direction and is flush with the upper wing plate; The node plate is vertically installed on the top surface of the expansion joint plate, and the two node plates are parallel to each other; Multiple stiffening plates are vertically arranged on the bottom surface of the expansion joint plate and are spaced apart along the axial direction of the H-beam. The stiffening plates extend into the inside of the H-beam, and their extended ends are fixedly connected to the upper flange, lower flange and web plate respectively. An upper pad is fitted onto the top surface of the upper wing plate; The lower pad is fitted to the bottom surface of the lower wing plate; Several reinforcing plates are disposed between the two node plates and are fixedly connected to the upper pad plate.

[0007] This application uses H-beams as the main structure of the chord, which can significantly reduce the amount of steel used and lower material costs while ensuring structural strength. Moreover, it does not require welding, which simplifies the construction process, shortens the construction period, and reduces production costs. By setting extension plates on both sides of the upper flange, the size of the H-beams used can be reduced, the overall weight of the chord can be reduced, steel usage can be saved, and material costs can be further reduced. It can also ensure that the spacing of the node plates meets the design requirements.

[0008] Based on the above technical solution, the solution of this application can be further improved as follows: Preferably, the lower pad extends beyond the edge of the lower flange on both sides along the width direction and is flush with the lower flange on both sides along the length direction. This design forms a straight weld, which improves welding portability and connection reliability, allows the two to work together under stress and deform synchronously, thereby enhancing the longitudinal overall load-bearing capacity and enabling the chords to be tightly connected, thus improving the connection stability.

[0009] Preferably, the stiffening plate extends downward to form a protrusion, which is connected to the top surface of the lower pad plate and spaced apart from the lower wing plate. This solution optimizes the stress transmission path, reduces local stress concentration, improves the overall stability of the chord, and avoids right-angle welding areas, thereby ensuring the welding effect of the lower pad plate and the lower wing plate.

[0010] Preferably, the upper pad extends beyond the edge of the upper flange on both sides along the width direction and is flush with the upper flange on both sides along the length direction; and the upper pad has mounting grooves on both sides along the width direction, with the node plates arranged in corresponding positions in the mounting grooves; this solution forms a straight weld, improving welding portability and connection reliability, allowing the two to work together under stress and deform synchronously, thereby enhancing the longitudinal overall load-bearing capacity, and also enabling the chord members to be tightly connected, thus improving connection stability, and avoiding structural interference by avoiding the node plates.

[0011] Preferably, the distance between the two mounting grooves is less than the width of the upper wing plate; by adopting this solution, a groove-shaped welding area is formed, which provides a stable and regular welding interface, improves welding portability and connection reliability, and also provides clearance space for welding the node plate and the extension plate, avoiding welding difficulties and quality problems due to narrow space.

[0012] Preferably, the mounting groove is spaced apart from the adjacent node plate on both sides and located on both sides of the top surface of the adjacent extension plate along the length direction; with this solution, a straight weld is formed, which enables the two ends of the extension plate to form a solid weld with the upper pad plate, thereby optimizing the stress transmission path, reducing local stress concentration, and improving the overall stability of the chord.

[0013] Preferably, the upper wing plate has multiple first bolt holes at both ends, the lower wing plate has multiple second bolt holes at both ends, and the web plate has multiple third bolt holes at both ends. The upper pad has fourth bolt holes at both ends corresponding to the first bolt holes, and the lower pad has fifth bolt holes at both ends corresponding to the second bolt holes; the node plate has multiple sixth bolt holes at the end away from the extension plate; this solution ensures the stability of the connection between chord members and between chord members and web members, reduces on-site construction difficulty, improves construction efficiency, and enhances connection accuracy.

[0014] Preferably, the stiffening plate has a rectangular structure, and the two corners near the web are provided with clearance notches; this solution improves the connection stability, reduces stress concentration, avoids interference with the arc-shaped corners on the inner side of the H-beam, and improves installation accuracy.

[0015] Preferably, the end of the node plate away from the joint plate is an isosceles trapezoid or semicircle; by adopting this solution, the amount of steel used can be reduced and the material cost can be lowered while ensuring the connection strength.

[0016] Secondly, the present invention discloses a method for manufacturing an H-shaped chord, comprising the following steps: S1. First, lay the H-beam flat on the jig, then mark the assembly position line of the extension plate on the H-beam, assemble the extension plate according to the assembly position line, and use CO2 gas shielded welding to weld the butt weld between the upper flange and the extension plate in the flat position. After the welding is completed, inspect the weld quality. S2. Flip the H-beam 90°, then mark the assembly position line of the stiffening plate on one side of the H-beam. Assemble the stiffening plate according to the assembly position line. Use CO2 gas shielded welding to weld the stiffening plate to the upper and lower flanges in the upright position. Use CO2 gas shielded welding to weld the stiffening plate to the web in the horizontal position. After welding, inspect the weld quality. S3. Flip the H-beam 180° and mark the assembly position line of the stiffening plate on the other side of the H-beam. Assemble the stiffening plate according to the assembly position line. Use CO2 gas shielded welding to weld the stiffening plate to the upper and lower flanges in the upright position. Use CO2 gas shielded welding to weld the stiffening plate to the web in the horizontal position. After welding, inspect the weld quality. S4. Flip the H-beam 90°, mark the assembly position line of the pad on the lower flange, assemble the lower pad according to the assembly position line, and use CO2 gas shielded welding for positioning welding. S5. Flip the H-beam 180°, mark the assembly position line of the pad on the upper flange, assemble the pad according to the assembly position line, use CO2 gas shielded welding for positioning welding, then weld the weld between the upper pad and the upper flange at the node plate position in the flat position, and inspect the weld quality after the welding is completed. S6. Use CO2 gas shielded welding to weld the lower backing plate and the lower flange plate in a horizontal position. After welding, inspect the weld quality. S7. Flip the H-beam 180° and use CO2 gas shielded welding to weld the upper backing plate and the upper flange outside the node plate in a flat position. After welding, inspect the weld quality. S8. Flip the H-beam 180° and mark the assembly position lines for the node plate and reinforcing plate on the H-beam. Assemble the node plate and reinforcing plate according to the assembly position lines. Use CO2 gas shielded welding to weld the weld between the reinforcing plate and the node plate in the upright position. Then weld the weld between the reinforcing plate and the upper backing plate in the horizontal position. Next, weld the weld between the node plate and the upper flange in the horizontal position. After the welding is completed, check the weld quality. S9. Repair the welding deformation of the chord members and adjust the flatness to ≤1mm / m; S10. Draw the drilling alignment lines at both ends of the upper flange, lower flange and web on the scribing platform, and then draw the drilling alignment lines on the node plate. S11. Drill the hole groups on the upper flange, lower flange, web and node plate using a CNC drilling machine.

[0017] Through the above technical solution, the present invention achieves the following beneficial effects: 1. This application uses H-beams as the main structure of the chord members. Compared with the main structure of traditional box-type chord members, it can significantly reduce the amount of steel used and reduce material costs while ensuring structural strength. 2. By setting extension plates on both sides of the upper flange, this application can reduce the size of the H-beams used, reduce the overall weight of the chord, thereby saving steel consumption, further reducing material costs, and ensuring that the spacing of the node plates meets the design requirements; 3. By using H-beams as the main structure of the chord, this application eliminates the need for welding, which simplifies the construction process, shortens the construction period, and reduces production costs compared to the traditional box-type chord, which requires purchasing steel plates and then welding them into a box shape. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the H-shaped chord according to a specific embodiment of the present invention; Figure 2 for Figure 1 The diagram shows the structure of the H-shaped chord. Figure 3 for Figure 1 The diagram shows the location of the bolt holes in the H-shaped chord. Figure 4 for Figure 1 Top view of the H-shaped chord; Figure 5 for Figure 1 Side view of the H-shaped chord; Explanation of reference numerals in the attached figures: 1. H-beam; 11. Upper flange; 1101. First bolt hole; 12. Lower flange; 1201. Second bolt hole; 13. Web; 1301. Third bolt hole; 2. Connection structure; 21. Wiring plate; 22. Node plate; 2201. Sixth bolt hole; 23. Stiffening plate; 231. Protrusion; 2301. Clearance notch; 3. Upper backing plate; 301. Mounting groove; 302. Fourth bolt hole; 4. Lower pad; 401. Fifth bolt hole; 5. Reinforcing plate. Detailed Implementation

[0020] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0021] The terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as “first” or “second” may explicitly or implicitly include one or more of the stated features.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1: like Figures 1-5 As shown in the figure, this embodiment discloses an H-shaped chord member, which is used as a key load-bearing component of a steel truss structure. It has the advantages of low steel consumption, simple construction process, low manufacturing cost and short construction period. Its specific structure includes: H-shaped steel 1, two connecting structures 2, upper pad 3, lower pad 4 and several reinforcing plates 5.

[0025] H-beam 1 includes an upper flange 11, a lower flange 12, and a web 13. The upper flange 11 and the lower flange 12 are parallel and located on the upper and lower sides of the web 13 to form an H-shaped cross section. It is the main load-bearing structure of the chord member and has good bending resistance and structural stability.

[0026] Two connecting structures 2 are symmetrically arranged on both sides of the H-beam 1. This symmetrical arrangement ensures that the mechanical properties of the chord are balanced on both sides when it is under stress, reducing deformation and stress concentration caused by uneven stress.

[0027] like Figure 5 As shown, each connection structure 2 includes: A width-adjusting plate 21 is provided on the edge of the upper wing plate 11 along the width direction and is flush with the upper wing plate 11. It is used to increase the width of the upper wing plate 11 in this direction and provide sufficient space for the installation of the node plate 22. The node plate 22 is vertically installed on the top surface of the connecting plate 21, and the two node plates 22 are parallel to each other, so as to provide a stable connection interface to facilitate a reliable connection with the web member; Multiple stiffening plates 23 are vertically arranged on the bottom surface of the expansion joint plate 21 and are spaced apart along the axial direction of the H-beam 1. The stiffening plates 23 extend into the inside of the H-beam 1, and their extended ends are fixedly connected to the upper flange 11, the lower flange 12 and the web plate 13, respectively. They are used to enhance the connection strength between the expansion joint plate 21 and the H-beam 1, thereby improving the rigidity and stability of the entire connection structure 2 and preventing deformation or damage under stress.

[0028] It should be noted that the spacing between the two node plates 22 must match the width of the web member. Therefore, by setting the connecting plates 21 on both sides of the upper flange 11 in the width direction, the spacing of the node plates 22 meets the design requirements, the node plates 22 can be stably connected, and the size of the H-beam 1 can be reduced, thereby reducing the overall weight of the chord, saving steel consumption, and reducing manufacturing costs.

[0029] The upper pad 3 is attached to the top surface of the upper flange 11, thereby enhancing the structural strength of the upper flange 11 and improving the bending strength, load-bearing capacity and stability of the chord.

[0030] The lower pad 4 is attached to the bottom surface of the lower flange 12, thereby enhancing the structural strength of the lower flange 12 and improving the bending strength, load-bearing capacity and stability of the chord.

[0031] Several reinforcing plates 5 are placed between two node plates 22 and fixedly connected to the upper pad plate 3. They are used to connect the upper pad plate 3, node plate 22 and H-beam 1 into a whole so that they can jointly bear the external load and improve the bending and shear resistance of the node plate 22.

[0032] The above technical solution has the following technical effects: I. Using H-beams 1 as the main structure of the chord members can significantly reduce the amount of steel used and lower material costs compared to the main structure of traditional box-type chord members, while ensuring structural strength. Second, using H-beams as the main structure of the chord members eliminates the need for welding, which simplifies the construction process, shortens the construction cycle, and reduces production costs compared to the traditional box-type chord members that require purchasing steel plates and then welding them into a box shape. Third, by setting the width-adjusting plates 21 on both sides of the upper flange 11, the specification of the H-beam 1 used can be reduced, the overall weight of the chord can be reduced, the amount of steel used can be saved, the material cost can be further reduced, and the spacing of the node plates 22 can be guaranteed to meet the design requirements.

[0033] In some embodiments, such as Figure 1 and Figure 2 As shown, the lower pad 4 extends beyond the edge of the lower wing plate 12 on both sides along the width direction, and is flush with the lower wing plate 12 on both sides along the length direction.

[0034] By extending the width direction to form a straight weld, welding portability and connection reliability are improved; by aligning the length direction, the two elements work together under stress and can deform synchronously, thereby enhancing the overall longitudinal load-bearing capacity and allowing the chords to fit together tightly, thus improving connection stability.

[0035] Based on the above embodiments, such as Figure 1 , Figure 2 and Figure 5 As shown, the stiffening plate 23 extends downward to form a protrusion 231, which is connected to the top surface of the lower pad plate 4 and is spaced apart from the lower wing plate 12.

[0036] The above settings optimize the stress transmission path, reduce local stress concentration, improve the overall stability of the chord, and avoid right-angle welding areas, thereby ensuring the welding effect of the lower pad 4 and the lower flange 12.

[0037] In some embodiments, such as Figure 1 and Figure 2 As shown, the upper pad 3 extends beyond the edge of the upper wing plate 11 on both sides along the width direction and is flush with the upper wing plate 11 on both sides along the length direction; and the upper pad 3 has mounting grooves 301 on both sides along the width direction, and node plates 22 are arranged in the mounting grooves 301 one by one.

[0038] By extending the width direction to form a straight weld, welding portability and connection reliability are improved; by aligning the length direction, the two elements work together to deform synchronously, thereby enhancing the overall longitudinal load-bearing capacity and allowing the chord members to be tightly connected, thus improving connection stability; by creating the installation groove 301, the node plate 22 is avoided, preventing structural interference.

[0039] Based on the above embodiments, such as Figure 1 and Figure 2 As shown, the distance between the two mounting grooves 301 is less than the width of the upper wing plate 11.

[0040] The above configuration creates a groove-shaped welding area between the inner side of the mounting groove 301 and the top surface of the upper wing plate 11, providing a stable and regular welding interface, improving welding portability and connection reliability, and also providing clearance space for welding the node plate 22 and the extension plate 21, avoiding welding difficulties and quality problems due to narrow space.

[0041] Based on the above embodiments, such as Figure 2 and Figure 4 As shown, the mounting groove 301 is spaced apart from the adjacent node plate 22 on both sides and is located on both sides of the top surface of the adjacent extension plate 21 along the length direction.

[0042] Through the above settings, straight welds are formed between the inner side of the mounting groove 301 and the top surface of the extension plate 21, as well as between the two sides of the extension plate 21 and the bottom surface of the upper pad 3. This allows the two ends of the extension plate 21 to form a stable weld with the upper pad 3, thereby optimizing the stress transmission path, reducing local stress concentration, and improving the overall stability of the chord.

[0043] In some embodiments, such as Figure 3As shown, the upper flange 11 has multiple first bolt holes 1101 at both ends, the lower flange 12 has multiple second bolt holes 1201 at both ends, and the web 13 has multiple third bolt holes 1301 at both ends. These are preferably distributed in a rectangular array to reduce stress concentration and improve structural stability, but are not limited to this. The upper pad 3 has fourth bolt holes 302 at both ends corresponding to the first bolt holes 1101, and the lower pad 4 has fifth bolt holes 401 at both ends corresponding to the second bolt holes 1201. The node plate 22 has multiple sixth bolt holes 2201 at the end away from the extension plate 21.

[0044] The above setup ensures the stability of the connections between chord members and between chord members and web members, reduces on-site construction difficulty, improves construction efficiency, and enhances connection accuracy.

[0045] In some embodiments, such as Figure 5 As shown, the stiffening plate 23 has a rectangular structure, and the two corners near the web plate 13 are provided with clearance notches 2301.

[0046] The rectangular design maximizes the contact area between the stiffening plate 23 and the upper flange 11, lower flange 12 and web plate 13, thereby improving the connection stability and reducing stress concentration. Furthermore, by opening the avoidance notch 2301, interference with the arc-shaped corner on the inner side of the H-beam 1 is avoided, thus improving the installation accuracy.

[0047] In some embodiments, such as Figure 5 As shown, the end of the node plate 22 away from the joint plate 21 is an isosceles trapezoid or semicircle, which can reduce the amount of steel used and reduce material costs while ensuring connection strength.

[0048] The following provides further details regarding this application: When connecting two adjacent chords, first align the ends of the two chords, then attach connecting plates to the top surface of the upper pad 3, the bottom surface of the lower pad 4, the two sides of the bottom surface of the upper flange 11, the two sides of the top surface of the lower flange 12, and the two sides of the web 13 in the docking area, and keep the bolt holes on each connecting plate aligned with the bolt holes at the ends of the chords, and finally connect and fix them with bolts and nuts.

[0049] When connecting the chord and the web member, first insert the end of the web member between the two node plates 22, then align the bolt holes on both sides of the web member with the corresponding bolt holes on the node plates 22, and finally connect and fix it with bolts and nuts.

[0050] Example 2: This embodiment discloses a method for manufacturing an H-type chord, including the following steps: S1. First, lay the H-beam 1 flat on the jig, then mark the assembly position line of the connecting plate 21 on the H-beam 1, assemble the connecting plate 21 according to the assembly position line, and use CO2 gas shielded welding to weld the butt weld between the upper flange 11 and the connecting plate 21 in the flat position. After the welding is completed, check the weld quality. S2. Flip the H-beam 1 90°, then mark the assembly position line of the stiffening plate 23 on one side of the H-beam 1. Assemble the stiffening plate 23 according to the assembly position line. Use CO2 gas shielded welding to weld the stiffening plate 23 to the upper flange 11 and the lower flange 12 in the upright position. Use CO2 gas shielded welding to weld the stiffening plate 23 to the web plate 13 in the horizontal position. After the welding is completed, check the weld quality. S3. Flip the H-beam 1 180° and mark the assembly position line of the stiffening plate 23 on the other side of the H-beam 1. Assemble the stiffening plate 23 according to the assembly position line. Use CO2 gas shielded welding to weld the stiffening plate 23 to the upper flange 11 and the lower flange 12 in the upright position. Use CO2 gas shielded welding to weld the stiffening plate 23 to the web plate 13 in the horizontal position. After the welding is completed, check the weld quality. S4. Flip the H-beam 1 90°, mark the assembly position line of the pad 4 on the lower flange 12, assemble the lower pad 4 according to the assembly position line, and use CO2 gas shielded welding for positioning welding. S5. Flip the H-beam 1 180°, mark the assembly position line of the pad 3 on the upper flange 11, assemble the upper pad 3 according to the assembly position line, and use CO2 gas shielded welding for positioning welding. Then, weld the weld between the upper pad 3 and the upper flange 11 at the node plate 22 in the flat position. After the welding is completed, check the weld quality. S6. CO2 gas shielded welding is used to weld the weld between the lower backing plate 4 and the lower flange plate 12 in a horizontal position. After the welding is completed, the weld quality is inspected. S7. Flip the H-beam 1 180° and use CO2 gas shielded welding to weld the weld between the upper backing plate 3 and the upper flange 11 outside the node plate 22 in the flat position. After the welding is completed, inspect the weld quality. S8. Flip the H-beam 180° and mark the assembly position lines for the node plate 22 and the reinforcing plate 5 on the H-beam 1. Assemble the node plate 22 and the reinforcing plate 5 according to the assembly position lines. Use CO2 gas shielded welding to weld the weld between the reinforcing plate 5 and the node plate 22 in the upright position. Then weld the weld between the reinforcing plate 5 and the upper backing plate 3 in the horizontal position. Next, weld the weld between the node plate 22 and the upper flange 11 in the horizontal position. After the welding is completed, check the weld quality. S9. Repair the welding deformation of the chord members and adjust the flatness to ≤1mm / m; S10. Draw the drilling alignment lines at both ends of the upper wing plate 11, lower wing plate 12 and web plate 13 on the scribing platform, and then draw the drilling alignment lines on the node plate 22. S11. Drill the holes on the upper flange 11, lower flange 12, web 13 and node plate 22 using a CNC drilling machine.

[0051] This application uses hot-rolled H-beams as the main structure of the chord members, which requires no welding and has a simple manufacturing method. Compared with the previous box-type chord member structure, it can simplify the construction process and shorten the construction period.

[0052] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. An H-type chord, characterized in that, include: H-beams, including upper flange, lower flange and web; Two connecting structures are symmetrically arranged on both sides of the H-beam; Each of the connection structures includes: A connecting plate is provided at the edge of the upper wing plate along the width direction and is flush with the upper wing plate; The node plate is vertically installed on the top surface of the expansion joint plate, and the two node plates are parallel to each other; Multiple stiffening plates are vertically arranged on the bottom surface of the expansion joint plate and are spaced apart along the axial direction of the H-beam. The stiffening plates extend into the inside of the H-beam, and their extended ends are fixedly connected to the upper flange, lower flange and web plate respectively. An upper pad is fitted onto the top surface of the upper wing plate; the upper pad extends beyond the edge of the upper wing plate on both sides along the width direction and is flush with the upper wing plate on both sides along the length direction; and mounting grooves are formed on both sides of the upper pad along the width direction, with node plates arranged in corresponding positions within each mounting groove; the distance between two mounting grooves is less than the width of the upper wing plate; the mounting grooves are spaced apart from adjacent node plates on both sides and located on both sides of the top surface of adjacent connecting plates along the length direction; The lower pad is fitted to the bottom surface of the lower wing plate; Several reinforcing plates are disposed between the two node plates and are fixedly connected to the upper pad plate.

2. The H-type chord according to claim 1, characterized in that, The lower pad extends beyond the edge of the lower wing plate on both sides along the width direction and is flush with the lower wing plate on both sides along the length direction.

3. The H-type chord according to claim 2, characterized in that, The stiffening plate extends downward to form a protrusion, which is connected to the top surface of the lower pad and is spaced apart from the lower wing plate.

4. The H-type chord according to claim 1, characterized in that, The upper wing plate has multiple first bolt holes at both ends, the lower wing plate has multiple second bolt holes at both ends, and the web plate has multiple third bolt holes at both ends. The upper pad has fourth bolt holes at both ends corresponding to the first bolt holes, and the lower pad has fifth bolt holes at both ends corresponding to the second bolt holes; the node plate has multiple sixth bolt holes at the end away from the joint plate.

5. The H-type chord according to claim 1, characterized in that, The stiffening plate has a rectangular structure, and there are clearance notches at the two corners near the web plate.

6. The H-type chord according to claim 1, characterized in that, The end of the node plate away from the joint plate is an isosceles trapezoid or a semicircle.

7. A method for manufacturing an H-shaped chord, characterized in that, Includes the following steps: S1. First, lay the H-beam flat on the jig, then mark the assembly position line of the extension plate on the H-beam, assemble the extension plate according to the assembly position line, and use CO2 gas shielded welding to weld the butt weld between the upper flange and the extension plate in the flat position. After the welding is completed, inspect the weld quality. S2. Flip the H-beam 90°, then mark the assembly position line of the stiffening plate on one side of the H-beam. Assemble the stiffening plate according to the assembly position line. Use CO2 gas shielded welding to weld the stiffening plate to the upper and lower flanges in the upright position. Use CO2 gas shielded welding to weld the stiffening plate to the web in the horizontal position. After welding, inspect the weld quality. S3. Flip the H-beam 180° and mark the assembly position line of the stiffening plate on the other side of the H-beam. Assemble the stiffening plate according to the assembly position line. Use CO2 gas shielded welding to weld the stiffening plate to the upper and lower flanges in the upright position. Use CO2 gas shielded welding to weld the stiffening plate to the web in the horizontal position. After welding, inspect the weld quality. S4. Flip the H-beam 90°, mark the assembly position line of the pad on the lower flange, assemble the lower pad according to the assembly position line, and use CO2 gas shielded welding for positioning welding. S5. Flip the H-beam 180°, mark the assembly position line of the pad on the upper flange, assemble the pad according to the assembly position line, use CO2 gas shielded welding for positioning welding, then weld the weld between the upper pad and the upper flange at the node plate position in the flat position, and inspect the weld quality after the welding is completed. S6. Use CO2 gas shielded welding to weld the lower backing plate and the lower flange plate in a horizontal position. After welding, inspect the weld quality. S7. Flip the H-beam 180° and use CO2 gas shielded welding to weld the upper backing plate and the upper flange outside the node plate in the flat position. After welding, inspect the weld quality. S8. Flip the H-beam 180° and mark the assembly position lines for the node plate and reinforcing plate on the H-beam. Assemble the node plate and reinforcing plate according to the assembly position lines. Use CO2 gas shielded welding to weld the weld between the reinforcing plate and the node plate in the upright position. Then weld the weld between the reinforcing plate and the upper backing plate in the horizontal position. Next, weld the weld between the node plate and the upper flange in the horizontal position. After the welding is completed, check the weld quality. S9. Repair the welding deformation of the chord members and adjust the flatness to ≤1mm / m; S10. Draw the drilling alignment lines at both ends of the upper flange, lower flange and web on the scribing platform, and then draw the drilling alignment lines on the node plate. S11. Drill the hole group on the upper flange, lower flange, web and node plate using a CNC drilling machine.

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