High-ductility concrete reinforcing mesh reinforcing structure of historical building wall

Abstract

The utility model relates to the technical field of buildings, in particular to a high-ductility concrete reinforcing mesh reinforcing structure of a historical building wall, which comprises high-ductility concrete fixedly attached to the outer wall surface of a brick masonry wall; the reinforcing mesh is fixedly combined in the high-ductility concrete; the anchor bars are bent rods, one parts of the anchor bars are fixedly inserted into mortar joints of the brick masonry wall, and the other parts of the anchor bars are embedded into the high-ductility concrete and hook the reinforcing mesh; in the utility model, in order to avoid concrete cracking, the density of the area, close to the door and window opening, of the reinforcing mesh is greater than that of other areas of the reinforcing mesh; in order to avoid the damage to the original structure caused by direct drilling and slotting on the wall body to fix the reinforcing mesh or the connecting piece in the traditional technology, the connecting piece, namely the anchor bar, of the reinforcing mesh is directly fixed by utilizing the mortar joint position of the brick masonry, the brick does not need to be damaged, the influence on the structure is reduced to the minimum degree, and the construction cost is reduced. And meanwhile, the bonding strength between new and old structures is ensured.

Description

Technical Field

[0001] This utility model relates to the field of building technology, specifically, it is a high-ductility concrete steel mesh reinforcement structure for the walls of modern brick-and-wood historical buildings. Background Technology

[0002] Traditional steel mesh reinforcement technology involves drilling holes in the wall surface, binding steel mesh, and then pouring concrete or cement mortar for reinforcement. This construction method is widely used in the seismic reinforcement and structural strengthening of old buildings. Open-port cities like Shanghai possess a large number of outstanding modern historical buildings, whose architectural styles hold significant historical value. These buildings are generally multi-story mixed-structure houses with brick and wood as the main components. In the project development, adhering to the principle of "inheriting historical features and injecting modern functions," the exterior facades, distinctive interior decorations, and construction methods are preserved to maintain the historical architectural style. For brick-and-wood structures where the walls are mainly composed of clay bricks as vertical load-bearing components, upgrades and renovations are needed after long-term use. This is due to two main reasons: firstly, the clay bricks themselves deteriorate (e.g., weathering, crumbling, damage, cracking) or structural deformation and bending, leading to insufficient load-bearing capacity; secondly, modern usage needs and changes in building functions increase the load-bearing capacity requirements. Therefore, the walls need to be reinforced as required.

[0003] However, the existing technology has the following drawbacks:

[0004] A. Significant damage to the original structure: Traditional methods require drilling holes and openings in the wall and excavating large-scale foundation trenches. For example, the reinforcement structure disclosed in the patent with authorization announcement number CN207934487U causes significant damage to the integrity of the original structure, especially the structural stability of old buildings may be further reduced.

[0005] B. Complex construction and long construction period: Traditional reinforcement processes are complex, require a lot of manpower and time, and the noise and material waste generated during construction are quite serious problems;

[0006] C. Impact on building facade: Double-sided reinforcement will damage the building facade, affecting the building's aesthetics and functionality. Utility Model Content

[0007] The purpose of this invention is to provide a high-ductility concrete steel mesh reinforcement structure for the walls of historical buildings, in order to overcome the defects existing in the prior art.

[0008] The purpose of this utility model is achieved as follows: a high-ductility concrete reinforced mesh reinforcement structure for the walls of historical buildings, comprising:

[0009] High-ductility concrete is fixedly applied to the exterior wall surface of the brick masonry wall.

[0010] The steel mesh is fixedly bonded within high-ductility concrete;

[0011] Several anchor bars, wherein the anchor bars are configured as bent bars, one part of which is fixed to the mortar joint of the brick masonry wall, and the other part is embedded in the high ductility concrete and hooks the steel mesh.

[0012] Furthermore, the density of the steel mesh near the door and window openings is greater than the density of other areas of the steel mesh.

[0013] Furthermore, the area of ​​the steel mesh along the horizontal side of the door and window opening is designated as the first reinforcing part.

[0014] Furthermore, the first reinforcing part is fixedly provided with several reinforcing vertical rods.

[0015] Furthermore, the area of ​​the steel mesh along the vertical side of the door and window opening is designated as a second reinforcing section.

[0016] Furthermore, the second reinforcing part is fixedly provided with several reinforcing crossbars.

[0017] Furthermore, the area of ​​the steel mesh facing the corner of the door and window opening is designated as a third reinforcing part, which is fixedly connected to the first and second reinforcing parts as a whole.

[0018] Furthermore, the third reinforcing part is fixedly provided with several diagonal rods, and the two ends of the diagonal rods are respectively fixedly connected to the first reinforcing part and the second reinforcing part.

[0019] Furthermore, the steel mesh includes several vertical bars and several horizontal bars, the horizontal bars intersecting the vertical bars perpendicularly and being fixedly connected to form a mesh structure, and the anchor bars hooking the horizontal bars.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. The technical solution of this utility model is mainly used in the repair and reinforcement of historical buildings. In order to avoid the damage to the building facade shape caused by traditional technology, this technical solution only reinforces the inner side of the outer wall with high ductility concrete steel mesh.

[0022] 2. To avoid the damage to the original structure caused by drilling holes and slots directly in the wall to fix the steel mesh or connectors in the traditional technology, this technology uses the mortar joints of the brick masonry to directly fix the steel mesh connectors - anchor bars, without damaging the bricks, thus minimizing the impact on the structure, while ensuring the bonding strength between the new and old structures.

[0023] 3. Increase the density of steel mesh at door and window openings and corners to strengthen the structure and prevent concrete cracking caused by excessive local stress. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the brick masonry reinforcement structure of this utility model.

[0025] Figure 2 This is an exploded view of the structure of this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1-Brick masonry wall; 2-Steel mesh; 2a-First reinforcement; 2b-Second reinforcement; 2c-Third reinforcement; 3-Anchor bar; 4-High ductility concrete; 5-Door and window openings. Detailed Implementation

[0027] The following will refer to the appendix in the embodiments of this utility model. Figure 1-2 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1 , 2 As shown, a high-ductility concrete reinforced mesh reinforcement structure for the walls of historical buildings is proposed, comprising:

[0029] High ductility concrete 4 is fixedly applied to the exterior wall surface of the brick masonry wall 1. High ductility concrete (HDC) is a special type of concrete with high strength, high toughness, high crack resistance and high damage resistance.

[0030] The steel mesh 2 is fixedly bonded to the high-ductility concrete 4;

[0031] Several anchor bars 3 are set as bent bars, in the form of L-shapes. One part of the anchor bar is set as a horizontal extension and is fixed to the mortar joint of the brick masonry wall 1. The other part is embedded in the high ductility concrete 4 and hooks the steel mesh 2.

[0032] The steel mesh 2 includes several vertical bars and several horizontal bars. The horizontal bars intersect the vertical bars perpendicularly and are fixedly connected to form a mesh structure. The anchor bars 3 hook onto the horizontal bars and are fixedly connected to each other.

[0033] The density of the steel mesh 2 in the area near the door and window openings 5 ​​(including the corner side) is greater than the density of other areas of the steel mesh 2. That is, the density of the rods in the area near the door and window openings 5 ​​of the steel mesh 2 is denser than that in other areas, thereby strengthening the structure and preventing concrete cracking caused by excessive local stress.

[0034] In a preferred embodiment, the area of ​​the steel mesh 2 along the horizontal side of the door and window opening 5 is designated as a first reinforcing part 2a. The first reinforcing part 2a is fixedly provided with several reinforcing vertical bars, that is, several reinforcing vertical bars are added on the original basis to increase the distribution density of the bars, thereby enhancing the structural strength.

[0035] In a preferred embodiment, the area of ​​the steel mesh 2 along the vertical side of the door and window opening 5 is designated as a second reinforcing part 2b. The second reinforcing part 2b is fixedly provided with several reinforcing crossbars. That is, several reinforcing crossbars are added on the original basis to increase the density of the bar distribution, thereby enhancing the structural strength.

[0036] The area of ​​the steel mesh 2 facing the corner of the door and window opening 5 is designated as the third reinforcing part 2c. The third reinforcing part 2c is fixedly connected to the first reinforcing part 2a and the second reinforcing part 2b. The third reinforcing part 2c is fixedly provided with several diagonal rods 2c. The two ends of the diagonal rods 2c are fixedly connected to the first reinforcing part 2a and the second reinforcing part 2b respectively, thereby reinforcing the area of ​​the steel mesh 2 facing the corner of the door and window opening 5.

[0037] Regarding the aforementioned reinforcement structure, the key points for construction of this utility model are as follows:

[0038] A. Base treatment process:

[0039] The mortar joints of the reinforced wall shall be treated as follows:

[0040] a: When the original mortar joint has high strength and is relatively hard, and is extremely difficult to break with a small hammer, the mortar joint will remain in its current state.

[0041] b: When the original mortar joint is relatively soft and easy to clean, clean the mortar joint to the hard part (≥30mm);

[0042] c: The original mortar joints are extremely loose and severely powdery. The depth of cleaning the mortar joints on one side of the wall should not be less than 1 / 4 of the brick wall thickness (if conditions permit, it should be demolished and rebuilt).

[0043] Grouting should be done in sections, with each section spaced one meter apart. The other side can only be worked on after one side has been completed. The grout joints should be cleaned before drilling holes in the wall to attach the mesh.

[0044] Before constructing the high-ductility concrete surface layer, the original decorative surface layer of the reinforced area should be completely removed, and the joints should be cleaned. If necessary, the damaged parts should be partially demolished and repaired. After cleaning the base layer, the wall surface should be repeatedly moistened with water.

[0045] B. Mortar mixing process:

[0046] During the on-site mixing of high-ductility concrete, it is essential to strictly adhere to the construction mix proportions and the order of material addition. First, add 90% water, then gradually add the masterbatch during mixing, adding the remaining 10% water until the masterbatch is thoroughly mixed. Next, gradually add the fibers, mixing for approximately 15 minutes until the fibers are dispersed and free of lumps, then stop mixing.

[0047] C. Finishing process:

[0048] The thickness of the high-ductility concrete surface layer should be constructed according to the design requirements of the drawings. The wall surface should be reinforced with mortar and mortar spots should be set to ensure that the verticality, flatness, squareness of the inside and outside corners, straightness and other aspects meet the construction specifications.

[0049] Before applying the high-ductility concrete surface layer, the wall surface should be moistened with water, and application should only proceed after the surface is damp but without standing water. When the high-ductility concrete surface layer is thicker than 15mm, it is advisable to apply it in layers, with each layer not exceeding 15mm in thickness. The next layer should be applied during the initial hardening of the previous layer, and the time interval between two layers should not exceed 4 hours. Except for the final layer, which requires a smooth finish, the surface of the previous layers should be kept rough.

[0050] D. Maintenance procedures:

[0051] After the high-ductility concrete plastering is completed, water curing should begin within 12 hours after the surface has initially hardened. Water should be sprayed every 4 to 5 hours, and moist curing should be carried out for 5 to 7 days. Keep the surface moist and the curing time should not be less than 7 days. During this period, the reinforced parts should be protected from hard impacts.

[0052] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In this utility model, it should also be noted that the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, integral molding connection, mechanical connection, or indirect connection through intermediate connecting parts. The specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-ductility concrete reinforced mesh reinforcement structure for the walls of historical buildings, characterized in that, include: High-ductility concrete (4) is fixedly attached to the outer wall surface of the brick masonry wall (1); The steel mesh (2) is fixedly bonded to the high ductility concrete (4); Several anchor bars (3) are provided, wherein the anchor bars (3) are bent bars, one part of which is fixed to the mortar joint of the brick masonry wall (1), and the other part is embedded in the high ductility concrete (4) and hooks the steel mesh (2).

2. The high-ductility concrete reinforced mesh reinforcement structure for the walls of historical buildings according to claim 1, characterized in that: The density of the steel mesh (2) near the door and window openings (5) is greater than the density of other areas of the steel mesh (2).

3. The high-ductility concrete reinforced mesh reinforcement structure for the wall of a historical building according to claim 2, characterized in that: The area of ​​the steel mesh (2) along the horizontal side of the door and window opening (5) is designated as the first reinforcement (2a).

4. The high-ductility concrete reinforced mesh reinforcement structure for the wall of a historical building according to claim 3, characterized in that: The first reinforcing part (2a) is fixedly provided with several reinforcing vertical rods.

5. A high-ductility concrete reinforced mesh reinforcement structure for the wall of a historical building according to claim 3, characterized in that: The area of ​​the steel mesh (2) along the vertical side of the door and window opening (5) is designated as the second reinforcement (2b).

6. A high-ductility concrete reinforced mesh reinforcement structure for the wall of a historical building according to claim 5, characterized in that: The second reinforcing part (2b) is fixedly provided with several reinforcing crossbars.

7. A high-ductility concrete reinforced mesh reinforcement structure for the wall of a historical building according to claim 5, characterized in that: The area of ​​the steel mesh (2) facing the corner of the door and window opening (5) is designated as the third reinforcing part (2c), and the third reinforcing part (2c) is fixedly connected to the first reinforcing part (2a) and the second reinforcing part (2b) as one unit.

8. A high-ductility concrete reinforced mesh reinforcement structure for the wall of a historical building according to claim 7, characterized in that: The third reinforcing part (2c) is fixedly provided with several diagonal rods, and the two ends of the diagonal rods are fixedly connected to the first reinforcing part (2a) and the second reinforcing part (2b) respectively.

9. A high-ductility concrete reinforced mesh reinforcement structure for the walls of historical buildings according to any one of claims 1-8, characterized in that: The steel mesh (2) includes several vertical bars and several horizontal bars. The horizontal bars intersect the vertical bars perpendicularly and are fixedly connected to form a mesh structure. The anchor bars (3) are hooked to the horizontal bars.

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