Reinforcing structure of old building wood beam
By installing I-beams and angle steel profiles under the wooden beams of old buildings, combined with the reinforcement method of concrete pouring layers, the problem of needing to remove the wooden beams in the existing technology was solved, the durability and load-bearing capacity of the wooden beams were improved, and the original appearance of the building was preserved.
Patent Information
- Application Number
- CN202422860078.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Existing reinforcement methods require the removal or replacement of old building wooden beams, which involves a large workload and significantly alters the original appearance of the building, and the reinforcement effect needs to be improved.
The structure employs a combination of I-beams, angle steel profiles, and a concrete pouring layer. By setting an installation cavity under the wooden beam and pouring concrete, a reinforced structure is formed that wraps around the wooden beam. This eliminates the need to remove the original components and enhances the durability and load-bearing capacity of the wooden beam.
It significantly improves the durability and load-bearing capacity of the wooden beams, while preserving the integrity of the original building structure. The construction process does not damage the original appearance, and the reinforcement effect is remarkable.
Smart Images
Figure CN223469080U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to building reinforcing technical field, concretely relates to a reinforcing structure of old building wood beam. BACKGROUND
[0002] Chinese building has long history tradition and brilliant achievement, and the existing old building usually adopts wood frame as the load bearing structure of house or adopts brick and wood structure, and the existing old building with the elapse of time, often because of aging or use load increase leads to wood beam bending resistance carrying capacity deficiency, causes historical building or housing to be damaged, and causes the security hidden danger. Therefore, in order to be able to restore and improve the carrying capacity of wood beam in wood structure or brick and wood structure beam column system, better protect old building, protect its living value or historical and cultural value, carry out reasonable and effective reinforcement to building wood beam, have very important significance. For example, two or three layers of brick and wood structure of the fifties and sixties of last century or brick and wood structure of other years, if continue to use, need to carry out maintenance and reinforcement to building. However, the existing reinforcing method often needs to remove or replace original wood beam, and the workload is big, and the original appearance of building is changed greatly, and the reinforcing effect needs to be further improved. SUMMARY
[0003] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims at providing a reinforcing structure of old building wood beam, which does not need to remove original wood beam and related components during construction, can significantly improve the durability and carrying capacity of wood beam, and can retain the original structure part effect, with good reinforcing effect.
[0004] In order to solve the above technical problem, the utility model adopts the following technical scheme: a reinforcing structure of old building wood beam, characterized by comprising I-shaped steel section, first angle steel section, second angle steel section and concrete pouring layer, the front end and / or rear end of the I-shaped steel section is used for fixing to wall body, the I-shaped steel section is arranged below the wood beam to be reinforced, and the upper end of the I-shaped steel section is connected with the first angle steel section and the second angle steel section on both sides respectively, the first angle steel section, the upper end of the I-shaped steel section and the second angle steel section form mounting cavity for being sleeved on the outer surface of the wood beam to be reinforced, or the first angle steel section and the second angle steel section form mounting cavity for being sleeved on the outer surface of the wood beam to be reinforced, the upper end of the mounting cavity is open, and the concrete pouring layer is arranged between the gap between the wood beam to be reinforced and the inner wall of the mounting cavity.
[0005] Further, the I-shaped steel profile comprises an upper flange, a lower flange and a web plate between the upper flange and the lower flange, the first angle steel profile comprises a first horizontal plate arranged horizontally and a first vertical plate connected to the lower end of the first horizontal plate, and the second angle steel profile comprises a second horizontal plate arranged horizontally and a second vertical plate connected to the lower end of the second horizontal plate; the upper flange is arranged below the wood beam to be reinforced, and the two side ends of the upper flange are connected with the first horizontal plate and the second horizontal plate respectively; the first vertical plate, the first horizontal plate, the upper flange, the second horizontal plate and the second vertical plate form an installation cavity for being sleeved on the outer surface of the wood beam to be reinforced, or the first vertical plate, the first horizontal plate, the second horizontal plate and the second vertical plate form an installation cavity for being sleeved on the outer surface of the wood beam to be reinforced, the upper end of the installation cavity is open, and the concrete pouring layer is arranged between the wood beam to be reinforced and the gap between the inner wall of the installation cavity.
[0006] Further, the first angle steel profile and the second angle steel profile are symmetrically arranged at the two side ends of the upper flange, and the first horizontal plate and the second horizontal plate are arranged on the upper end surface of the upper flange; the first vertical plate, the first horizontal plate, the upper flange, the second horizontal plate and the second vertical plate form an installation cavity for being sleeved on the lower part of the wood beam to be reinforced.
[0007] Further, the first angle steel profile and the second angle steel profile are symmetrically arranged at the two side ends of the upper flange, and the first horizontal plate and the second horizontal plate are arranged on the upper end surface of the upper flange; the first horizontal plate is connected with the second horizontal plate at the end away from the first vertical plate and the second vertical plate, and the first vertical plate, the first horizontal plate, the second horizontal plate and the second vertical plate form an installation cavity for being sleeved on the lower part of the wood beam to be reinforced.
[0008] Further, the upper ends of the first vertical plate and the second vertical plate are lower than the upper end of the wood beam to be reinforced.
[0009] Further, the reinforcing structure further comprises a tie screw, the tie screw passes through the first vertical plate, the concrete pouring layer, the wood beam to be reinforced and the second vertical plate, and the two ends of the tie screw are fixed to the first vertical plate and the second vertical plate respectively.
[0010] Further, the front end and / or the rear end of the I-shaped steel profile is provided with a node steel plate, the node steel plate is used for being connected with the wall body, and the node steel plate is provided with a rear-embedded anchor bolt for fixing the node steel plate to the wall body.
[0011] Further, the node steel plate is welded to the front end or the rear end of the I-shaped steel profile.
[0012] Further, the first horizontal plate and the second horizontal plate are both welded to the upper end surface of the upper flange.
[0013] Further, the node steel plate comprises a welding plate and a mounting block, one side of the welding plate is used for connecting with the wall body, two ends of the other side of the welding plate are welded with the I-shaped steel section and the middle part is connected with the mounting block, and the mounting block is fixedly connected with the I-shaped steel section through connecting bolts.
[0014] Further, the surfaces of the I-shaped steel section, the first angle steel section and the second angle steel section are provided with rust-proof paint layers and / or fireproof paint layers.
[0015] The old building wood beam reinforcing structure has the advantages that the I-shaped steel section, the first angle steel section and the second angle steel section are arranged below the wood beam to be reinforced, are matched with each other, form the mounting cavity for being sleeved on the outer surface of the wood beam to be reinforced, and after the mounting cavity is sleeved on the outer periphery of the wood beam to be reinforced, the concrete pouring layer is formed by pouring concrete between the mounting cavity and the wood beam to be reinforced, and the wood beam to be reinforced is reinforced. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a front view of the old building wood beam reinforcing structure of Embodiment 1.
[0017] Figure 2 It is a left view of the old building wood beam reinforcing structure of Embodiment 1.
[0018] Figure 3 It is a front view of the old building wood beam reinforcing structure of Embodiment 2.
[0019] The reference signs comprise: 1, I-shaped steel section; 11, upper wing plate; 12, lower wing plate; 13, web plate; 2, first angle steel section; 21, first horizontal plate; 22, first vertical plate; 3, second angle steel section; 31, second horizontal plate; 32, second vertical plate; 4, concrete pouring layer; 5, tie rod; 6, node steel plate; 61, welding plate; 62, mounting block; 63, connecting bolt; 7, back-embedded anchor bolt; 8, wood beam to be reinforced; 9, secondary beam; 10, wall body. DETAILED DESCRIPTION
[0020] In order to facilitate the understanding of those skilled in the art, the present utility model is further described below in combination with embodiments and drawings, and the content mentioned in the embodiments is not a limitation on the present utility model.
[0021] Embodiment 1
[0022] As Figures 1-2As shown, a reinforcement structure of an old building wooden beam comprises an I-shaped steel profile 1, a first angle steel profile 2, a second angle steel profile 3 and a concrete pouring layer 4, the front end and / or the rear end of the I-shaped steel profile 1 is used for fixing to a wall body 10; the I-shaped steel profile is arranged below a wooden beam 8 to be reinforced, the two side ends of the upper end of the I-shaped steel profile 1 are connected with the first angle steel profile 2 and the second angle steel profile 2 respectively; the first angle steel profile 2, the upper end of the I-shaped steel profile 1 and the second angle steel profile 3 form a mounting cavity for being sleeved on the outer surface of the wooden beam 8 to be reinforced, the upper end of the mounting cavity is open, and the concrete pouring layer 4 is arranged between the gap between the wooden beam 8 to be reinforced and the inner wall of the mounting cavity.
[0023] Further, the I-shaped steel profile 1 comprises an upper flange 11, a lower flange 12 and a web plate 13 between the upper flange 11 and the lower flange 12, the first angle steel profile 2 comprises a first horizontal plate 21 arranged horizontally and a first vertical plate 22 connected with the lower end of the first horizontal plate 21; the second angle steel profile 3 comprises a second horizontal plate 31 arranged horizontally and a second vertical plate 32 connected with the lower end of the second horizontal plate 31; the upper flange 11 is arranged below the wooden beam 8 to be reinforced, and the two side ends of the upper flange 11 are connected with the first horizontal plate 21 and the second horizontal plate 31 respectively; the first vertical plate 22, the first horizontal plate 21, the upper flange 11, the second horizontal plate 31 and the second vertical plate 32 form a mounting cavity for being sleeved on the outer surface of the wooden beam 8 to be reinforced, the upper end of the mounting cavity is open, and the concrete pouring layer 4 is arranged between the gap between the wooden beam 8 to be reinforced and the inner wall of the mounting cavity.
[0024] The reinforcement structure of the old building wooden beam of the utility model sets the I-shaped steel profile 1 and the first angle steel profile 2 and the second angle steel profile 3 below the wooden beam 8 to be reinforced, the I-shaped steel profile 1 and the first angle steel profile 2 and the second angle steel profile 3 cooperate with each other to form a mounting cavity for being sleeved on the outer surface of the wooden beam 8 to be reinforced; and after the mounting cavity is positioned at the outer periphery of the wooden beam 8 to be reinforced, concrete is poured between the mounting cavity and the wooden beam 8 to be reinforced to form a concrete pouring layer 4 wrapped on the outer surface of the wooden beam 8 to be reinforced, which plays a reinforcing role on the wooden beam 8 to be reinforced. The reinforcement structure of the old building wooden beam does not need to remove original wooden beams and other related components during construction, reinforces the original wooden beam on the basis of retaining the original appearance of the building to a great extent, can significantly improve the durability and bearing capacity of the wooden beam, can retain the effect of the original structure part, and has good reinforcing effect. The concrete pouring layer 4 of the utility model can adopt high-ductility concrete in the prior art, has good fluidity and high compactness, can be well embedded with the original wooden beam 8 to be reinforced, for example, a wooden beam with gradually changing diameter and bending, and provides favorable guarantee for the subsequent durability of the wooden beam. The concrete pouring layer 4 is located in the mounting cavity and is connected with the first vertical plate 22, the first horizontal plate 21, the upper flange 11, the second horizontal plate 31 and the second vertical plate 32.
[0025] In the embodiment, the first angle steel profile 2 and the second angle steel profile 3 are symmetrically arranged at two side ends of the upper wing plate 11, and the first horizontal plate 21 and the second horizontal plate 31 are arranged at the upper end surface of the upper wing plate 11; the first vertical plate 22, the first horizontal plate 21, the upper wing plate 11, the second horizontal plate 31 and the second vertical plate 32 form an installation cavity for sleeving the lower part of the wood beam 8 to be reinforced. The first vertical plate 22 is connected to one end of the first horizontal plate 21 away from the second horizontal plate 31, and the second vertical plate 32 is connected to one end of the second horizontal plate 31 away from the first horizontal plate 21.
[0026] Further, the first horizontal plate 21 and the second horizontal plate 31 are welded to the upper end surface of the upper wing plate 11. The first angle steel profile 2 and the second angle steel profile 3 are welded to the I-beam profile 1 as a whole, and no welding process is required near the wood beam 8 to be reinforced, thereby avoiding the risk of fire.
[0027] Before the reinforcing structure is constructed, the actual size of the wood beam to be reinforced on site can be considered, the influence of wood beam diameter change and bending is considered, the specifications of the H-shaped steel, the first angle steel profile 2 and the second angle steel profile 3 are determined, and the first angle steel profile 2 and the second angle steel profile 3 can adopt the same specification of angle steel profile. Taking the cylindrical wood beam to be reinforced 8 as an example, during construction, the distance between the first horizontal plate 21 and the second horizontal plate 31 can be adjusted according to the diameter of the wood beam to be reinforced 8, and the first horizontal plate 21 and the second horizontal plate 31 are welded to appropriate parts of the upper end surface of the upper wing plate 11, so as to determine the width of the installation cavity, so that the width of the installation cavity is greater than the diameter of the wood beam to be reinforced 8. After the wood beam to be reinforced 8 is placed in the installation cavity, there is a gap between the upper end opening edge of the installation cavity and the wood beam to be reinforced 8, which facilitates pouring of concrete into the installation cavity and filling of the gap between the inner wall of the installation cavity and the wood beam to be reinforced 8, thereby achieving good reinforcing effect.
[0028] Further, the upper ends of the first vertical plate 22 and the second vertical plate 32 are lower than the upper end of the wood beam to be reinforced 8. In the embodiment, the lower part of the wood beam to be reinforced 8 is located in the installation cavity and is well embedded with the concrete pouring layer 4, and the upper part of the wood beam to be reinforced 8 is located outside the installation cavity. The embodiment effectively improves the reinforcing effect on the original wood beam under the premise of controlling the overall weight of the reinforcing structure.
[0029] Further, the reinforcing structure further comprises a tie bolt 5, the tie bolt 5 passes through the first vertical plate 22, the concrete pouring layer 4, the wood beam 8 to be reinforced and the second vertical plate 32, and two ends of the tie bolt 5 are fixed to the first vertical plate 22 and the second vertical plate 32 respectively. That is, the tie bolt 5 passes through the first vertical plate 22, part of the concrete pouring layer 4, the wood beam 8 to be reinforced, part of the concrete pouring layer 4 and the second vertical plate 32 in sequence. Due to the arrangement of the above structure, the stable connection between the wood beam 8 to be reinforced and the reinforcing structure is facilitated, and the bearing capacity and service life are provided.
[0030] Further, the front end and / or the rear end of the I-shaped steel profile 1 is provided with a node steel plate 6, the node steel plate 6 is used for being connected with the wall body 10, the node steel plate 6 is provided with a rear-embedded anchor bolt 7 for fixing the node steel plate 6 to the wall body 10. The node steel plate 6 is welded to the front end or the rear end of the I-shaped steel profile 1. Due to the arrangement of the above structure, the I-shaped steel profile 1 is stably fixed to the wall body 10, and the stability and the service life of the reinforcing structure are improved. Preferably, the wall body 10 applied in the embodiment can be a masonry wall reinforced by using a high ductility concrete surface layer method.
[0031] Further, the node steel plate 6 comprises a welding plate 61 and a mounting block 62, one side of the welding plate 61 is used for being connected with the wall body 10, two ends of the other side of the welding plate 61 are welded to the I-shaped steel profile 1, and the middle part of the other side is connected with the mounting block 62, and the mounting block 62 is fixedly connected with the I-shaped steel profile 1 through a connecting bolt 63. Due to the arrangement of the above structure, the node steel plate 6 is welded to the I-shaped steel profile 1 and is further fixedly connected with the I-shaped steel profile 1 through the connecting bolt 63, so that the connection between the two is more stable.
[0032] Further, the surface of the I-shaped steel profile 1, the first angle steel profile 2 and the second angle steel profile 3 is provided with a rust-proof paint layer or a fireproof paint layer. By brushing the rust-proof paint and / or the fireproof paint on the surface of the above steel member, the corrosion resistance and the fireproof performance of the reinforcing structure are improved.
[0033] The reinforcing structure is applied to reinforce the building wood beam below the secondary beam 9 of the old building, and the following steps are adopted for installation:
[0034] (1) Determine the size of the H-shaped steel according to calculations, and then install the node steel plate 6 and the post-buried anchor bolt 7 on the wall 10 according to the actual size on site and taking into account the diameter change and bending of the wooden beam 8 to be reinforced; (4) Weld the first angle steel profile 2 and the second angle steel profile 3 to the I-shaped steel profile 1 in advance, and then install the tie screw 5 and the connecting bolt 63 after positioning the first angle steel profile 2, the second angle steel profile 3 and the I-shaped steel profile 1; (5) Pour high-ductility concrete into the installation cavity to form a concrete pouring layer 4; (6) Perform anti-corrosion and fire-proofing treatment on the wooden beam 8 to be reinforced; apply anti-rust paint and / or fire-proof paint on the surface of the steel components such as the I-shaped steel profile 1, the first angle steel profile 2 and the second angle steel profile 3 to form an anti-rust paint layer and / or fire-proof paint layer.
[0035] Example 2
[0036] like Figure 3 As shown, a reinforcement structure for wooden beams of old buildings includes an I-beam profile 1, a first angle steel profile 2, a second angle steel profile 3 and a concrete pouring layer 4, the front end and / or rear end of the I-beam profile 1 is used to be fixed to the wall 10; the I-beam profile is arranged below the wooden beam 8 to be reinforced, and the two side ends of the upper end of the I-beam profile 1 are respectively connected to the first angle steel profile 2 and the second angle steel profile 2; an installation cavity for being mounted on the outer surface of the wooden beam 8 to be reinforced is formed between the first angle steel profile 2 and the second angle steel profile 3, the upper end of the installation cavity is open, and the concrete pouring layer 4 is arranged between the gap between the wooden beam 8 to be reinforced and the inner wall of the installation cavity.
[0037] Furthermore, the I-beam profile 1 includes an upper wing plate 11, a lower wing plate 12 and a web 13 located between the upper wing plate 11 and the lower wing plate 12, the first angle steel profile 2 includes a horizontally arranged first transverse plate 21 and a first vertical plate 22 connected to the first transverse plate 21 at the lower end; the second angle steel profile 3 includes a horizontally arranged second transverse plate 31 and a second vertical plate 32 connected to the second transverse plate 31 at the lower end; the upper wing plate 11 is arranged below the wooden beam 8 to be reinforced, and the two side ends of the upper wing plate 11 are respectively connected to the first transverse plate 21 and the second transverse plate 31; an installation cavity for being mounted on the outer surface of the wooden beam 8 to be reinforced is formed between the first vertical plate 22, the first transverse plate 21, the upper wing plate 11, the second transverse plate 31 and the second vertical plate 32, the upper end of the installation cavity is open, and the concrete pouring layer 4 is arranged between the gap between the wooden beam 8 to be reinforced and the inner wall of the installation cavity.
[0038] Further, the first angle steel profile 2 and the second angle steel profile 3 are symmetrically arranged at two side ends of the upper wing plate 11, and the first horizontal plate 21 and the second horizontal plate 31 are arranged at the upper end surface of the upper wing plate 11; one end of the first horizontal plate 21 away from the first vertical plate 22 is connected with one end of the second horizontal plate 31 away from the second vertical plate 32, and the first vertical plate 22, the first horizontal plate 21, the second horizontal plate 31 and the second vertical plate 32 form an installation cavity for sleeving the lower part of the wood beam 8 to be reinforced. Before the construction of the reinforcing structure, the specifications of the H-shaped steel, the first angle steel profile 2 and the second angle steel profile 3 need to be determined according to the actual size of the wood beam 8 to be reinforced on site. When the width of the wood beam 8 to be reinforced is smaller, for example, smaller than the sum of the widths of the first horizontal plate 21 and the second horizontal plate 31, the first horizontal plate 21 and the second horizontal plate 31 can be welded to the upper end surface of the upper wing plate 11, and the ends of the first horizontal plate 21 and the second horizontal plate 31 close to each other are connected with each other, so as to reduce the width of the installation cavity, and the size of the wood beam 8 to be reinforced is more matched, and a gap before the wood beam 8 to be reinforced and the inner wall of the installation cavity needs to be reserved. The concrete pouring layer 4 is located in the installation cavity and connected with the first vertical plate 22, the first horizontal plate 21, the second horizontal plate 31 and the second vertical plate 32. The present application can flexibly set the welding position of the first horizontal plate 21 and the second horizontal plate 31 on the upper wing plate 11 according to the needs, and has wide application range. The remaining contents of the embodiment are the same as those of the embodiment 1, and will not be described here.
[0039] The above is only the preferred embodiment of the present application, and for the ordinary skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the content of the description should not be understood as the limitation of the present application.
Claims
1. A reinforcing structure for an old building wooden beam, characterized by: The application relates to a reinforcing structure for a wood beam, which comprises an I-shaped steel section, a first angle steel section, a second angle steel section and a concrete pouring layer, the front end and / or the rear end of the I-shaped steel section being used for fixing to a wall body; the I-shaped steel section is arranged below a wood beam to be reinforced, the two side ends of the upper end of the I-shaped steel section being connected with the first angle steel section and the second angle steel section respectively; an installation cavity for being sleeved on the outer surface of the wood beam to be reinforced is formed between the first angle steel section, the upper end of the I-shaped steel section and the second angle steel section or between the first angle steel section and the second angle steel section, the upper end of the installation cavity being open, and the concrete pouring layer is arranged between the wood beam to be reinforced and the gap of the inner wall of the installation cavity.
2. The reinforcement structure of an old building wood beam according to claim 1, characterized in that: The I-shaped steel section comprises an upper flange, a lower flange and a web plate between the upper flange and the lower flange, the first angle steel section comprises a first horizontal plate arranged horizontally and a first vertical plate connected with the lower end of the first horizontal plate, and the second angle steel section comprises a second horizontal plate arranged horizontally and a second vertical plate connected with the lower end of the second horizontal plate; the upper flange is arranged below the wood beam to be reinforced, and the two side ends of the upper flange are connected with the first horizontal plate and the second horizontal plate respectively; an installation cavity for being sleeved on the outer surface of the wood beam to be reinforced is formed between the first vertical plate, the first horizontal plate, the upper flange, the second horizontal plate and the second vertical plate or between the first vertical plate, the first horizontal plate, the second horizontal plate and the second vertical plate.
3. The reinforcement structure of an old building wood beam according to claim 2, characterized in that: The first angle steel section and the second angle steel section are symmetrically arranged at the two side ends of the upper flange, and the first horizontal plate and the second horizontal plate are arranged on the upper end surface of the upper flange; an installation cavity for being sleeved on the lower part of the wood beam to be reinforced is formed between the first vertical plate, the first horizontal plate, the upper flange, the second horizontal plate and the second vertical plate.
4. The reinforcement structure of an old building wood beam according to claim 2, characterized by: The first angle steel section and the second angle steel section are symmetrically arranged at the two side ends of the upper flange, and the first horizontal plate and the second horizontal plate are arranged on the upper end surface of the upper flange; an installation cavity for being sleeved on the lower part of the wood beam to be reinforced is formed between the first horizontal plate, the second horizontal plate and the second vertical plate.
5. The reinforcement structure of an old building wood beam according to claim 2, characterized by: The upper ends of the first vertical plate and the second vertical plate are lower than the upper end of the wood beam to be reinforced.
6. The reinforcement structure of an old building wood beam according to claim 2, characterized by: The reinforcing structure further comprises a tie screw, the tie screw penetrating through the first vertical plate, the concrete pouring layer, the wood beam to be reinforced and the second vertical plate; and the two ends of the tie screw are fixed to the first vertical plate and the second vertical plate respectively.
7. The reinforcement structure of an old building wood beam according to claim 2, characterized by: The front end and / or the rear end of the I-shaped steel section is provided with a node steel plate, the node steel plate being used for connecting with the wall body, and the node steel plate is provided with a back-embedded anchor bolt for fixing the node steel plate to the wall body.
8. The reinforcement structure of an old building wood beam according to claim 7, characterized by: The node steel plate is welded to the front end or the rear end of the I-shaped steel section.
9. The reinforcement structure of an old building wood beam according to claim 7, characterized by: The node steel plate comprises a welding plate and a mounting block, one side surface of the welding plate is used for connecting with the wall body, the two ends of the other side surface of the welding plate are welded to the I-shaped steel section, and the middle part of the other side surface of the welding plate is connected with the mounting block, and the mounting block is fixedly connected with the I-shaped steel section through connecting bolts.
10. The reinforcement structure of an old building wood beam according to claim 2, characterized by: The first horizontal plate and the second horizontal plate are both welded to the upper end surface of the upper flange.