Transformation structure of I-shaped steel cross joint

Abstract

The utility model provides an I-shaped steel cross joint transformation structure which comprises an original steel beam, a first steel beam and a second steel beam. The newly-added steel beam is horizontally arranged in the second direction, and the newly-added steel beam can penetrate through the interior of the notch to be installed at the designed position; the reinforcing assembly is connected to the notch of the original steel beam in the first direction so as to increase the sectional area of the notch of the original steel beam. According to the technical scheme, the notches allowing the newly-added steel beams to penetrate through are formed in the original steel beams, the space occupied by the cross joint is remarkably reduced, the newly-added steel beams can be installed at the designed positions under the condition that the space is limited, the bearing capacity of the original steel beams at the notches is reinforced through the reinforcing assemblies, the bearing capacity of the joint is guaranteed, and the construction cost is reduced. And the situation that bearing force is provided for the structure only through welding seams at the joint position is avoided, and the stability of the joint is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steel structure reinforcement and reconstruction, and in particular to an I-beam intersection node reconstruction structure. Background Art

[0002] With the acceleration of urbanization and the continuous advancement of construction technology, the field of building structures is undergoing a transition from an era of incremental growth to an era of stock. During this transition, new steel structure projects are gradually decreasing, while the demand for renovation and reinforcement of existing steel structures is increasing.

[0003] During steel structure renovations, interference between newly added beams and existing beams is common. This is especially true in pipeline-intensive environments like industrial plants, where the installation space for new beams is severely limited by surrounding pipelines and clearance requirements, making installation difficult.

[0004] Existing patent document CN 117738488 A provides a secondary welded reinforcement node structure between H-shaped steel columns and steel beams. This structure can be used in environments with limited space. However, this reinforced node structure adopts a method of welding new steel beams to both sides of the original steel columns. As a result, the new steel beams rely entirely on the welds to provide their bearing capacity at the nodes, which can easily cause unstable bearing capacity at the nodes and affect structural safety. Utility Model Content

[0005] A technical problem to be solved by the present disclosure is: how to add new steel beams more stably under the condition of limited installation space.

[0006] In order to solve the above technical problems, the embodiment of the present disclosure provides an I-beam intersection node modification structure, including: an original steel beam, which is horizontally arranged along a first direction and has a notch; a newly added steel beam, which is horizontally arranged along a second direction and can pass through the notch to be installed at a designed position; a reinforcement component, which is connected to the notch 104 of the original steel beam 1 along the first direction to increase the cross-sectional area of ​​the original steel beam 1 at the notch 104 position.

[0007] In some embodiments, the original steel beam and the newly added steel beam are welded together at the notch.

[0008] In some embodiments, the original steel beam includes a first upper flange plate, a first web plate and a first lower flange plate, and the newly added steel beam includes a second upper flange plate, a second web plate and a second lower flange plate; wherein the notch is configured to disconnect the upper portion of the first upper flange plate and the first web plate, and the reinforcement assembly includes a plurality of reinforcing ribs passing through the second web plate and connected to the first upper flange plate, and a first reinforcing plate horizontally arranged at the lower portion of the first web plate and located below the notch.

[0009] In some embodiments, a plurality of openings horizontally distributed along the second direction are provided on the second web, and each reinforcing rib passes through an opening to connect to the first upper flange plates located on both sides of the newly added steel beam.

[0010] In some embodiments, the reinforcing ribs and the newly added steel beams are welded together at the openings.

[0011] In some embodiments, the first reinforcing plates are symmetrically arranged along the plane where the first web plate is located.

[0012] In some embodiments, a stiffening plate is vertically connected to the first web, one end of the stiffening plate is connected to the first upper flange plate, and the other end is connected to the first reinforcement plate.

[0013] In some embodiments, a plurality of stiffening plates are provided on the first web, and the plurality of stiffening plates are distributed on both sides of the slot along the first direction.

[0014] In some embodiments, the reinforcement assembly further includes a second reinforcement plate connected to the lower surface of the first lower flange plate along the first direction.

[0015] In some embodiments, the second reinforcing plate includes a vertical portion connected to the first lower flange plate and a horizontal portion connected below the vertical portion, and the second reinforcing plate is symmetrical along the plane where the first web plate is located.

[0016] Through the above technical solution, the I-beam intersection node reconstruction structure provided by the present invention provides a notch on the original steel beam for the new steel beam to pass through, which significantly reduces the space occupied by the intersection node, allowing the new steel beam to be installed at the designed position under space-constrained conditions, and utilizing reinforcement components to reinforce the bearing capacity of the original steel beam at the notch, thereby ensuring the bearing capacity of the node and avoiding relying solely on welds at the node position to provide bearing capacity for the structure, thereby improving the stability of the node. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 is a schematic front view of the modified structure disclosed in the embodiment of the present disclosure;

[0019] Figure 2 is a schematic right side view of the modified structure disclosed in the embodiment of the present disclosure;

[0020] Figure 3 It is a schematic diagram of the partial structure of the newly added steel beam disclosed in the embodiment of the present disclosure;

[0021] Figure 4 This is a schematic diagram of the local structure of the original steel beam disclosed in the embodiment of the present disclosure. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the local structure of the original steel beam disclosed in the embodiment of the present disclosure. Figure 2 ;

[0023] Figure 6 is a schematic top view of the first reinforcement plate disclosed in an embodiment of the present disclosure;

[0024] Figure 7 is a schematic cross-sectional view of the original steel beam and the reinforcement assembly at the notch disclosed in the embodiment of the present disclosure;

[0025] Figure 8 It is a schematic cross-sectional view of the original steel beam disclosed in the embodiment of the present disclosure.

[0026] Description of reference numerals:

[0027] 1. Original steel beam; 101. First upper flange plate; 102. First web plate; 103. First lower flange plate; 104. Notch; 2. Newly added steel beam; 201. Second upper flange plate; 202. Second web plate; 203. Second lower flange plate; 204. Opening; 3. Reinforcement assembly; 301. Reinforcement rib; 302. First reinforcement plate; 303. Second reinforcement plate; 304. Stiffening plate; 305. Vertical portion; 306. Horizontal portion. DETAILED DESCRIPTION

[0028] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0029] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0030] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0031] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0032] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0033] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0035] like Figure 1-Figure 2As shown, the present disclosure provides an I-beam intersection node modification structure, including: an original steel beam 1, which is horizontally arranged along a first direction and has a notch 104; a newly added steel beam 2, which is horizontally arranged along a second direction and can pass through the notch 104 to be installed at a designed position; and a reinforcement component 3, which is connected to the notch 104 of the original steel beam 1 along the first direction to increase the cross-sectional area of ​​the original steel beam 1 at the notch 104 position.

[0036] Specifically, if Figure 1 As shown, when the new steel beam 2 is installed above the existing steel beam 1 and there is local interference between the two, the new steel beam 2 cannot be adjusted upward due to the limited installation space. By providing a notch 104 in the existing steel beam 1, the new steel beam 2 can be installed through the notch 104, avoiding mutual interference between the existing steel beam 1 and the new steel beam 2. This effectively reduces the installation height of the intersection node, allowing the new steel beam 2 to be installed in the designed position under space-constrained conditions. In addition, the notch 104 does not completely truncate the existing steel beam 1. The portion of steel retained in the existing steel beam 1 at the notch 104 forms a weak section. Therefore, based on actual on-site construction conditions, the reinforcement assembly 3 can be arranged by directly welding steel along the first direction to the portion of steel forming the weak section to directly increase the cross-sectional area there, or by welding steel across the notch 104 to the intact steel on both sides of the notch 104 to indirectly increase the cross-sectional area there. Alternatively, a combination of the two methods can be used to reinforce the existing steel beam 1. The reinforcing component 3 and the weak section of the original steel beam 1 together form a new section at the notch 104, effectively increasing the cross-sectional area of ​​the original steel beam 1 at the notch 104 position, thereby achieving the purpose of improving the bearing capacity. In other embodiments, when the construction space is limited, the reinforcing component 3 can also be selected to be connected to the original steel beam 1 in a direction approximately similar to the first direction, so as to facilitate the welding operation of the workers. Compared with the method in which the node load is entirely borne by the weld, the original steel beam 1 disclosed in the present invention adopts the new section formed by the weak section after removing the notch 104 and the reinforcing component 3 at the intersection node to jointly bear the node load, thereby reducing the uncertainty caused by the full welding construction and improving the stability of the node.

[0037] In some embodiments, the original steel beam 1 and the newly added steel beam 2 are welded together at the notch 104 .

[0038] Specifically, if Figure 5 As shown, the notch 104 on the original steel beam 1 is opened into a shape that matches the cross-section of the newly added steel beam 2. After the newly added steel beam 2 passes through the notch 104 and is placed in the designed position, the original steel beam 1 and the newly added steel beam 2 are welded together at the notch 104, which can effectively improve the integrity of the intersection node and facilitate force bearing.

[0039] In some embodiments, the original steel beam 1 and the newly added steel beam 2 can also be bonded together using epoxy resin structural adhesive, which can also improve the integrity of the intersection node.

[0040] like Figures 1 to 6 As shown, in some embodiments, the original steel beam 1 includes a first upper flange plate 101, a first web plate 102 and a first lower flange plate 103, and the newly added steel beam 2 includes a second upper flange plate 201, a second web plate 202 and a second lower flange plate 203; wherein, the notch 104 is configured to disconnect the upper portion of the first upper flange plate 101 and the first web plate 102, and the reinforcement assembly 3 includes a plurality of reinforcing ribs 301 passing through the second web plate 202 and connected to the first upper flange plate 101, and a first reinforcing plate 302 horizontally arranged at the lower portion of the first web plate 102 and located below the notch 104.

[0041] Specifically, the second upper flange plate 201 is taller than the first upper flange plate 101. The reinforcing rib 301 passes through the second web plate 202 along the first direction, with its ends welded to the first upper flange plate 101 on either side of the notch 104. The first reinforcing plate 302 is welded to the lower portion of the first web plate 102 along the first direction. At the weak section of the original steel beam 1, the reinforcing rib 301 is positioned above the notch 104, and the first reinforcing plate 302 is positioned below it. The weakened section of the original steel beam 1 after the notch 104 is formed by these two components into a new section that bears the nodal load.

[0042] In some embodiments, according to the actual position of the newly added steel beam 2, the notch 104 can also be set to disconnect the first lower flange plate 103 and the lower part of the first web 102 or only disconnect part of the first web 102. Accordingly, the position of the reinforcement component 3 should also be adaptively adjusted, which can also solve the problem of local interference between the original steel beam 1 and the newly added steel beam 2 when space is limited.

[0043] In some embodiments, the reinforcing rib 301 is connected to the upper surface of the first upper flange plate 101 rather than the lower surface. On the one hand, it is convenient for workers to perform welding operations. On the other hand, it can make the reinforcing rib 301 away from the neutral axis of the new section, which is beneficial to provide a larger resistance moment for the new section. Using the same material can better improve the stress performance of the section.

[0044] like Figure 2 and Figure 3 As shown, in some embodiments, the second web 202 is provided with a plurality of openings 204 horizontally distributed along the second direction, and each reinforcing rib 301 passes through an opening 204 to connect to the first upper flange plates 101 located on both sides of the newly added steel beam 2.

[0045] Specifically, multiple openings 204 are horizontally distributed along the second direction above the first upper flange plate 101, allowing multiple reinforcing ribs 301 to pass through the openings 204 and adhere to the upper surface of the first upper flange plate 101. During construction, before installing the new steel beam 2, construction workers set multiple openings 204 at predetermined locations on the second web 202 and pass the reinforcing ribs 301 through the openings 204 and place them on the new steel beam 2. After the new steel beam 2 is installed on the original steel beam 1 through the notch 104, the reinforcing ribs 301 are welded to the upper surface of the first upper flange plate 101. In other embodiments, the openings 204 may also be set at locations on the second web 202 corresponding to the upper portion of the first web 102, depending on actual conditions.

[0046] In some embodiments, the reinforcing ribs 301 and the newly added steel beam 2 are welded together at the opening 204 .

[0047] Specifically, after workers pass reinforcing bar 301 through opening 204 and place it on newly added steel beam 2, they weld reinforcing bar 301 to newly added steel beam 2 to ensure the stability of reinforcing bar 301 during construction and improve the overall stability of the intersection. In other embodiments, to facilitate construction, reinforcing bar 301 and newly added steel beam 2 may also be connected using structural adhesive.

[0048] like Figure 2 and Figure 6 As shown, in some embodiments, the first reinforcement plates 302 are symmetrically arranged along the plane where the first web 102 is located.

[0049] Specifically, in order to ensure that the new section composed of the reinforcement component 3 and the weak section of the original steel beam 1 is stable in stress, the first reinforcement plate 302 is divided into two parts, which are symmetrically arranged on both sides of the first web 102, which is beneficial to improving the uniform stress of the new section under load, reducing the torsional effect of the structure, and improving the seismic performance of the structure.

[0050] like Figure 1 As shown, in some embodiments, a stiffening plate 304 is vertically connected to the first web 102 , and one end of the stiffening plate 304 is connected to the first upper flange plate 101 , and the other end is connected to the first reinforcement plate 302 .

[0051] Specifically, the stiffening plate 304 is arranged on the first web 102 near the slot 104 to improve the local stability of the original steel beam 1 at the weak section, and can effectively improve the torsional stiffness at the intersection node position to prevent the first upper flange plate 101 and the first reinforcement plate 302 from bending and deformation.

[0052] In some embodiments, a plurality of stiffening plates 304 are disposed on the first web 102 , and the plurality of stiffening plates 304 are distributed on both sides of the slot 104 along the first direction.

[0053] Specifically, stiffening plates 304 are provided on both sides of the slot 104 along the first direction. At the same time, the multiple stiffening plates 304 are symmetrical along the plane where the first web 102 is located, which can ensure that the I-beam cross node modification structure can be evenly stressed under the action of load, so that the structure can obtain better stress performance.

[0054] like Figure 1 and Figure 2 As shown, in some embodiments, the reinforcement assembly 3 further includes a second reinforcement plate 303 connected to the lower surface of the first lower flange plate 103 along the first direction.

[0055] Specifically, the second reinforcing plate 303 is welded to the lower surface of the first lower flange plate 103. Together with the weak section, reinforcing ribs 301, and first reinforcing plate 302, it forms a new section to resist the node load. When there is ample construction space below the existing steel beam 1, where the newly added steel beam 2 is not required, installing the second reinforcing plate 303 on the lower surface of the first lower flange plate 103 can effectively increase the resistance moment of the new section and improve the node stability.

[0056] like Figure 1 and Figure 2 As shown, in some embodiments, the second reinforcing plate 303 includes a vertical portion 305 connected to the first lower flange plate 103 and a horizontal portion 306 connected below the vertical portion 305. The second reinforcing plate 303 is symmetrical along the plane of the first web plate 102. Specifically, the vertical portion 305 can effectively increase the vertical distance between the horizontal portion 306 and the neutral axis of the new cross-section, thereby increasing the moment resistance of the new cross-section.

[0057] like Figure 1 and Figure 6 As shown, in some embodiments, chamfers are provided around the first reinforcing plate 302 away from the first web 102 and around the horizontal portion 306 of the second reinforcing plate 303 to facilitate edge stress release and reduce the occurrence of structural edge cracks.

[0058] like Figure 7 and Figure 8 As shown, in some embodiments, in order to ensure that the node has sufficient bearing capacity and avoid waste caused by excessive use of materials, before the structure is constructed, the resistance moment W of the original cross section of the original steel beam 1 is measured. x Calculate and then calculate the resistance moment W of the new section composed of the reinforcement component 3 and the weak section of the original steel beam 1 according to the design xs Calculate and compare the two to ensure that W xs ≥W x , ensuring that the load-bearing capacity of the intersection node is not lower than that of the original steel beam 1. The specific calculation process is as follows.

[0059] Step 1: Calculate the original section resistance moment W x ,like Figure 8 As shown, the cross-sectional data of the original steel beam 1 is measured, including: height H, width B, flange plate thickness d and web plate thickness c, and the following is obtained:

[0060]

[0061] Step 2: Convert the cross-section of the reinforcement bar 301. Usually, when reinforcement construction is carried out, the reinforcement bar 301 uses high-strength steel bars with greater strength than the original steel beam 1. Therefore, before calculating the resistance moment of the new section, the area of ​​the reinforcement bar 301 needs to be converted into an equivalent area with the same strength as the original steel beam 1.

[0062] Specifically, the strength of the reinforcing rib 301 is f s , the cross-sectional area of ​​the reinforcement rib 301 is A s , the steel strength of the original steel beam 1 is f y , then the converted area A 补强筋 for:

[0063] A 补强筋 =A s *f s / f y ;

[0064] Step 3: Calculate the position of the neutral axis n of the new section. Take the horizontal plane where the center of the reinforcement rib 301 at the upper edge of the new section is located as the reference plane, and calculate the vertical distance y from the neutral axis n to the reference plane.

[0065] First, calculate the area of ​​each part of the new section and the area moment of the reference surface:

[0066] part Area A Area moment S about the reference plane horizontal portion 306 <![CDATA[A1=B1t1]]> <![CDATA[S1=B1t1d1]]> Vertical portion 305 <![CDATA[A2=B2t2]]> <![CDATA[S2=B2t2d2]]> First reinforcement plate 302 <![CDATA[A3=2*B3t3]]> <![CDATA[S3=2*B3t3d3]]> First lower flange plate 103 <![CDATA[A 下翼缘 =Bd]]> <![CDATA[S 下翼缘 =Bd*d 下翼缘 ]]> First web 102 <![CDATA[A 腹板 =(H-x-2d)*c]]> <![CDATA[S 腹板 =(H-x-2d)*c*d 腹板 ]]>

[0067] in,

[0068] d x represent Figure 7 The vertical distance from the center of each component shown in to the reference plane;

[0069] B x , t x , B, H, d, x, c represent Figure 7 The size parameters of each component shown in ;

[0070] The vertical distance y from the neutral axis n to the reference plane is calculated as:

[0071]

[0072] Step 4: Calculate the moment of inertia of the new section about the neutral axis n

[0073]

[0074] Step 5: Calculate the resistance moment of the upper and lower edges of the new section;

[0075] in,

[0076] The upper edge resistance moment W of the new section xs上 for:

[0077] The upper edge resistance moment W of the new section xs下 for:

[0078] The sixth step is equal strength determination. When the following requirements are met, it can be considered that the resistance moment of the new section is greater than that of the original section;

[0079] W xs上 ≥W x And W xs下 ≥W x ;

[0080] On the premise that the new cross-section meets the equal strength judgment, the material usage of the reinforcement component 3 can be optimized to save the transformation cost.

[0081] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0082] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there are no structural conflicts, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A structure for modifying an I-beam intersection node, characterized in that: include: An original steel beam (1), the original steel beam (1) being arranged horizontally along a first direction and having a notch (104) formed thereon; A new steel beam (2) is added, the new steel beam (2) is arranged horizontally along the second direction and the new steel beam (2) can pass through the slot (104) to be installed at a designed position; A reinforcing component (3) is connected to the notch (104) of the original steel beam (1) along a first direction to increase the cross-sectional area of ​​the original steel beam (1) at the notch (104).

2. The I-beam intersection node reconstruction structure according to claim 1, characterized in that: The original steel beam (1) includes a first upper flange plate (101), a first web plate (102) and a first lower flange plate (103), and the newly added steel beam (2) includes a second upper flange plate (201), a second web plate (202) and a second lower flange plate (203); wherein, The notch (104) is configured to disconnect the first upper flange plate (101) and the upper portion of the first web plate (102); the reinforcement assembly (3) comprises a plurality of reinforcement ribs (301) passing through the second web plate (202) and connected to the first upper flange plate (101); and a first reinforcement plate (302) horizontally arranged at the lower portion of the first web plate (102) and located below the notch (104).

3. The I-beam intersection node reconstruction structure according to claim 1, characterized in that: The original steel beam (1) and the newly added steel beam (2) are welded together at the notch (104).

4. The I-beam intersection node reconstruction structure according to claim 2, characterized in that: The second web (202) is provided with a plurality of openings (204) horizontally distributed along a second direction, and each of the reinforcing ribs (301) passes through one of the openings (204) to connect to the first upper flange plates (101) located on both sides of the newly added steel beam (2).

5. The I-beam intersection node reconstruction structure according to claim 4, characterized in that: The reinforcing ribs (301) and the newly added steel beam (2) are welded together at the opening (204).

6. The I-beam intersection node reconstruction structure according to claim 2, characterized in that: The first reinforcing plate (302) is symmetrically arranged along the plane where the first web (102) is located.

7. The I-beam intersection node reconstruction structure according to claim 2, characterized in that: A stiffening plate (304) is vertically connected to the first web (102), one end of the stiffening plate (304) is connected to the first upper flange plate (101), and the other end is connected to the first reinforcement plate (302).

8. The I-beam intersection node reconstruction structure according to claim 7, characterized in that: A plurality of stiffening plates (304) are provided on the first web (102), and the plurality of stiffening plates (304) are distributed on both sides of the slot (104) along a first direction.

9. The I-beam intersection node reconstruction structure according to claim 2, characterized in that: The reinforcement assembly (3) further comprises a second reinforcement plate (303) connected to the lower surface of the first lower flange plate (103) along a first direction.

10. The I-beam intersection node reconstruction structure according to claim 9, characterized in that: The second reinforcing plate (303) includes a vertical portion (305) connected to the first lower flange plate (103) and a horizontal portion (306) connected below the vertical portion (305), and the second reinforcing plate (303) is symmetrical along the plane where the first web (102) is located.

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