Methods for internal replacement and reinforcement of old masonry in hollow cavity walls
By alternating the placement of reinforcing bricks and the insertion of steel bars within the hollow hopper wall, the problems of insufficient reinforcement and long construction period of the hollow hopper wall were solved, achieving both efficient reinforcement and aesthetic protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 央固工程科技(上海)有限公司
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-31
AI Technical Summary
Existing methods for reinforcing hollow walls suffer from problems such as insufficient reinforcement, long construction periods, and significant damage to the building's appearance.
The method of internal replacement and reinforcement of old masonry with hollow brick walls is adopted. First and second reinforcing bricks are alternately set in the height direction of the existing inner wall, and steel bars are inserted in the vertical channel. Combined with grout filling, a structure similar to a structural column is formed to avoid damaging the building's appearance.
It achieved efficient reinforcement, improved the strength and rigidity of the hollow wall, shortened the construction period, and protected the original appearance of the building.
Smart Images
Figure CN120465726B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of existing hollow cavity wall reinforcement technology, and in particular to a method for internal replacement reinforcement of old hollow cavity wall masonry. Background Technology
[0002] Hollow brick walls refer to hollow walls constructed by side-laying or alternating side-laying with bricks. They are usually constructed using standard bricks (240mm×115mm×53mm) and are classified according to the direction of brick laying. The most common method is the sleepless hollow brick wall, where each row of bricks consists of alternating header and header bricks.
[0003] Compared to ordinary solid walls of the same thickness, hollow cavity walls save on bricks, mortar, and labor. Furthermore, the air gaps within the wall improve thermal insulation and heat preservation. However, due to their internal hollow structure, hollow cavity walls have poor seismic performance and insufficient overall rigidity, requiring reinforcement after long-term use.
[0004] Existing reinforcement methods for existing hollow brick masonry structures typically involve double-sided reinforced mesh plastering or pressure grouting. These methods have the following drawbacks:
[0005] 1. Increased wall load, affecting foundation stability;
[0006] 2. The construction period is long and causes significant damage to the building's appearance;
[0007] 3. Grouting material is difficult to fill cavities evenly, which can easily create weak areas. Summary of the Invention
[0008] The purpose of this application is to address the problems of insufficient reinforcement, long construction period, and significant damage to the building's appearance in existing hollow brick wall reinforcement structures. Therefore, this application provides a method for internal replacement reinforcement of old hollow brick wall masonry. This method reinforces the internal walls of the hollow brick wall, avoids damage to the building's appearance, and forms a structure similar to a structural column through first reinforcing bricks, second reinforcing bricks, and steel bars, resulting in good reinforcement effect and a short construction period.
[0009] This application provides a method for internal replacement and reinforcement of old hollow brick masonry, including:
[0010] S1 Location Selection: Select the replacement location, which is located in the existing interior wall and extends along the height direction of the existing interior wall. The replacement location includes multiple brick layers, and the multiple brick layers are formed by alternating layers of two bricks and one brick.
[0011] S2 Replacement: Remove the bricks at the replacement location and insert a first reinforcing brick or a second reinforcing brick, as well as steel bars. The first reinforcing brick and the second reinforcing brick are alternately arranged along the height direction of the existing inner wall and are connected vertically to form a vertical channel. Steel bars are installed in the vertical channel or in the corresponding position of the vertical channel.
[0012] S3 grouting: filling the vertical channel and the space between the replacement part and the existing exterior wall with grout;
[0013] S4 Surface Repair: Cover the surface of the replacement part with a decorative layer and connect it to the existing exterior surface of the interior wall.
[0014] By adopting the above technical solution, the internal wall of the hollow cavity wall is reinforced, meaning that the reinforcement work surface is located inside the existing building. This not only reinforces the existing hollow cavity wall but also avoids damaging its external structure, thus protecting the original appearance of the existing building. Furthermore, by using first reinforcing bricks, second reinforcing bricks, and steel bars, the hollow cavity wall is reinforced along the height direction, forming a structure similar to a structural column. This results in a good reinforcement effect, meaning higher strength and rigidity. Moreover, the construction period for dismantling and laying bricks is shorter than the construction period for large-area, large-volume grouting.
[0015] In some embodiments, the first reinforcing brick is provided with a first through groove along the height direction, and the opening of the first through groove faces the outside of the existing inner wall.
[0016] The second reinforcing brick is provided with a second through groove and a third through groove along the height direction, and the openings of the second through groove and the third through groove both face the outside of the existing inner wall.
[0017] The first reinforcing brick replaces one of the two hopper bricks in the replacement section, and the second reinforcing brick replaces one hopper brick in the replacement section. The first through groove of the first reinforcing brick and the second through groove of the second reinforcing brick on one side of the second reinforcing brick are vertically connected to form a vertical channel. The first through groove of the first reinforcing brick and the third through groove of the second reinforcing brick on the other side of the second reinforcing brick are vertically connected to form another vertical channel.
[0018] S2 replacement is: removing the bricks of the replacement part layer by layer, and inserting a first or second reinforcing brick for each brick removed, and placing steel bars in the two vertical channels.
[0019] In some embodiments, the first reinforcing brick is provided with the first through groove on both opposite sides, and one of the two first through grooves has an opening facing the outside of the existing inner wall and the other has an opening facing the inside of the existing inner wall.
[0020] The second reinforcing brick has a second through groove and a third through groove on both opposite sides. The openings of the second through groove and the third through groove on one side of the second reinforcing brick face outwards from the existing interior wall, while the openings of the second through groove and the third through groove on one side of the second reinforcing brick face inwards from the existing interior wall.
[0021] S2 replacement is as follows: completely remove the bricks at the replacement site, install steel bars in the corresponding positions of the vertical channels with two openings facing the interior of the existing inner wall, then insert the first or second reinforcing brick, and then install steel bars in the vertical channels with two openings facing the exterior of the existing inner wall.
[0022] In some embodiments, the thickness of both the first reinforcing brick and the second reinforcing brick is greater than the thickness of the bucket brick, and less than the difference between the length and thickness of the bucket brick.
[0023] In some embodiments, the fluidity of the slurry is >300 mm.
[0024] In some embodiments, the decorative surface layer is a wire mesh mortar layer.
[0025] In some embodiments, the density of the first reinforcing brick and the second reinforcing brick is ≤800kg / m³. 3 Strength ≥ MU10.
[0026] Other features and corresponding beneficial effects of this application will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in this application. Attached Figure Description
[0027] Figure 1 This is a flowchart illustrating the application process.
[0028] Figure 2 This is a schematic diagram of the construction structure for this application;
[0029] Figure 3 This is a structural schematic diagram of the first reinforcing brick in this application;
[0030] Figure 4 This is a schematic diagram of the structure of the second reinforcing brick in this application.
[0031] Explanation of reference numerals in the attached figures:
[0032] 1. Existing interior walls; 2. Concrete bricks; 3. Header bricks;
[0033] 10. First reinforcing brick; 11. First through groove;
[0034] 20. Second reinforcing brick; 21. Second through groove; 22. Third through groove;
[0035] 30. Steel bars. Detailed Implementation
[0036] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.
[0037] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0039] The hollow wall includes inner and outer walls. Each layer of bricks is usually laid alternately with dou bricks 2 and header bricks 3, and the header bricks 3 are located in the middle of the dou bricks 2 in adjacent layers.
[0040] The terms "douzhuan 2" and "zhangzhuan 3" are defined based on the different laying directions of standard bricks. Douzhuan 2 refers to side bricks laid parallel to the wall, while zhangzhuan 3 refers to side bricks laid perpendicular to the wall.
[0041] Please see Figure 1-2 , Figure 1 This is a flowchart illustrating the application process. Figure 2 This is a schematic diagram of the construction structure for this application.
[0042] This application provides a method for internal replacement and reinforcement of old hollow brick masonry, including:
[0043] S1 Location Selection: Select the replacement location. The replacement location is located in the existing inner wall 1 and extends along the height direction of the existing inner wall 1. The replacement location includes multiple brick layers, and the multiple brick layers are formed by alternating layers of two dou bricks 2 and one dou brick 2.
[0044] Preferably, the replacement part is located near the doorway on the wall of the air hopper, as the wall near the doorway is usually prone to damage and has weak strength and rigidity.
[0045] Furthermore, replacement sites are installed every 2 meters to further enhance the overall reinforcement effect.
[0046] The replacement site is located in the existing interior wall 1, meaning the reinforcement work surface is located inside the existing building. This not only reinforces the existing hollow wall but also avoids damaging its external structure, thus protecting the original appearance of the existing building.
[0047] However, this method only reinforces one side of the hollow wall. If conventional reinforcement structures are used, such as 30 mesh steel reinforcement plastering, the reinforcement strength and rigidity are relatively weak.
[0048] Therefore, this method, by forming a structure similar to a structural column, ensures the reinforcement effect and is more suitable for later reinforcement construction compared to forming a structure similar to a reinforced masonry shear wall. Furthermore, the construction period for bricklaying and dismantling is shorter than that for existing large-area, large-volume grouting methods. Specifically,
[0049] S2 Replacement: Remove the brick 2 at the replacement location and insert a first reinforcing brick 10 or a second reinforcing brick 20, as well as a steel bar 30. The first reinforcing brick 10 and the second reinforcing brick 20 are alternately arranged along the height direction of the existing inner wall 1 and are connected vertically to form a vertical channel. The steel bar 30 is installed in the vertical channel or the corresponding position of the vertical channel.
[0050] S3 grouting: Grout is filled into the vertical channel and between the replacement part and the existing exterior wall, thereby strengthening the bond between the first reinforcing brick 10, the second reinforcing brick 20, the steel bar 30 and the existing wall, forming an overall grid structure, and further improving the reinforcement effect. Preferably, the grout has a fluidity > 300mm, for example, ultrafine cement-based grout can be used.
[0051] S4 Surface Repair: A finishing layer is applied to the replaced area and connected to the existing exterior surface of the interior wall 1. Typically, a wire mesh mortar compatible with the original wall is used for repair, restoring visual consistency.
[0052] In one embodiment, the first reinforcing brick 10 is provided with a first through groove 11 along the height direction, and the opening of the first through groove 11 faces the outside of the existing inner wall 1, that is, towards the construction work surface.
[0053] The second reinforcing brick 20 is provided with a second through groove 21 and a third through groove 22 along the height direction, and the openings of the second through groove 21 and the third through groove 22 are both facing the outside of the existing inner wall 1, that is, facing the construction work surface.
[0054] The first reinforcing brick 10 replaces one of the two hopper bricks 2 in the replacement section, and the second reinforcing brick 20 replaces one of the hopper bricks 2 in the replacement section. The first through groove 11 of the first reinforcing brick 10 and the second through groove 21 of the second reinforcing brick 20 on one side of the second reinforcing brick 20 are connected vertically to form a vertical channel. The first through groove 11 of the first reinforcing brick 10 and the third through groove 22 of the second reinforcing brick 20 on the other side of the second reinforcing brick 20 are connected vertically to form another vertical channel.
[0055] At this point, the vertical channel is located outside the reinforcing bricks, thus S2 replacement involves: removing the bricks 2 at the replacement site layer by layer, and inserting either the first reinforcing brick 10 or the second reinforcing brick 20 for each brick 2 removed. This method facilitates ensuring the stability of the existing wall during processing and construction, improving construction safety. Furthermore, after the replacement is completed, a vertical channel is formed directly opposite the work surface, and reinforcing bars 30 are placed within the two vertical channels. Simultaneously, this method, with two reinforcing bars 30 positioned in conjunction with the two vertical channels, further enhances the reinforcement effect.
[0056] Please see Figure 3-4 , Figure 3 This is a schematic diagram of the structure of the first reinforcing brick 10 in this application; Figure 4 This is a schematic diagram of the structure of the second reinforcing brick 20 in this application.
[0057] In one embodiment, the first reinforcing brick 10 is provided with a first through groove 11 on both opposite sides, and one of the two first through grooves 11 has its opening facing the outside of the existing inner wall 1, while the other has its opening facing the inside of the existing inner wall 1.
[0058] The second reinforcing brick 20 has a second through groove 21 and a third through groove 22 on both opposite sides. The openings of the second through groove 21 and the third through groove 22 on one side of the second reinforcing brick 20 face the outside of the existing inner wall 1, and the openings of the second through groove 21 and the third through groove 22 on one side of the second reinforcing brick 20 face the inside of the existing inner wall 1.
[0059] At this point, four vertical channels are formed around the reinforcing bricks, two facing the work surface and two located on the inner side and two on the outer side of the reinforcing bricks. Therefore, S2 is replaced by: completely removing the brick 2 at the replacement location, installing reinforcing bars 30 in the corresponding positions of the two vertical channels with openings facing the interior of the existing inner wall 1, inserting the first or second reinforcing brick, and then installing reinforcing bars 30 in the two vertical channels with openings facing the exterior of the existing inner wall 1.
[0060] This method ensures that the reinforced structure has 30 steel bars both inside and outside, forming a structure with 4 30 steel bars in the circumferential direction, which further improves the reinforcement effect.
[0061] In one embodiment, the thickness of the first reinforcing brick 10 and the second reinforcing brick 20 is greater than the thickness of the bucket brick 2 and less than the difference between the length and thickness of the bucket brick 2, so that the reinforcing brick has a certain thickness, which facilitates the setting of the through groove and ensures the strength of the reinforcing brick; at the same time, since the gap between the reinforcing brick and the existing exterior wall is reduced, the amount of subsequent grout can be reduced, the grout curing can be accelerated, and the construction cycle can be shortened.
[0062] In one embodiment, the density of the first reinforcing brick 10 and the second reinforcing brick 20 is ≤800kg / m³. 3 The strength must be ≥MU10 to ensure processing strength.
[0063] The standard bricks used for hollow wall construction are usually 240mm×115mm×53mm. To facilitate construction, in one specific embodiment, the overall dimensions of the first reinforcing brick 10 and the second reinforcing brick 20 are both 240mm×115mm×177mm. The fixed dimensions facilitate construction and improve efficiency. At the same time, it makes the gap between the reinforced structure and the existing exterior wall smaller, avoiding a large amount of wet work (grouting) on site, further improving efficiency, and is more environmentally friendly.
[0064] Furthermore, the dimensions of the through grooves are all 15mm×115mm×40mm, and 30mm diameter steel bars with a diameter of 12mm are used.
[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 this application.
Claims
1. A method for replacing and reinforcing an old cavity wall masonry, characterized by, include: S1 Location Selection: Select the replacement location, which is located in the existing interior wall and extends along the height direction of the existing interior wall. The replacement location includes multiple brick layers, and the multiple brick layers are formed by alternating layers of two bricks and one brick. S2 Replacement: Remove the bricks at the replacement location and insert a first reinforcing brick or a second reinforcing brick, as well as steel bars. The first reinforcing brick and the second reinforcing brick are alternately arranged along the height direction of the existing inner wall and are connected vertically to form a vertical channel. Steel bars are installed in the vertical channel or in the corresponding position of the vertical channel. S3 grouting: Filling the vertical channel and the space between the replacement part and the existing exterior wall with grout; S4 Surface Repair: Cover the surface of the replacement part with a decorative layer and connect it to the existing exterior surface of the interior wall; The first reinforcing brick is provided with a first through groove along the height direction, and the opening of the first through groove faces the outside of the existing inner wall. The second reinforcing brick is provided with a second through groove and a third through groove along the height direction, and the openings of the second through groove and the third through groove both face the outside of the existing inner wall. The first reinforcing brick replaces one of the two hopper bricks in the replacement section, and the second reinforcing brick replaces one hopper brick in the replacement section. The first through groove of the first reinforcing brick and the second through groove of the second reinforcing brick on one side of the second reinforcing brick are vertically connected to form a vertical channel. The first through groove of the first reinforcing brick and the third through groove of the second reinforcing brick on the other side of the second reinforcing brick are vertically connected to form another vertical channel. S2 replacement involves: removing the bricks at the replacement location layer by layer, and inserting a first or second reinforcing brick for each removed brick, and placing reinforcing bars in the two vertical channels; or, The first reinforcing brick is provided with the first through groove on both opposite sides, and one of the two first through grooves has its opening facing the outside of the existing inner wall, while the other has its opening facing the inside of the existing inner wall. The second reinforcing brick has a second through groove and a third through groove on both opposite sides. The openings of the second through groove and the third through groove on one side of the second reinforcing brick face outwards from the existing interior wall, while the openings of the second through groove and the third through groove on one side of the second reinforcing brick face inwards from the existing interior wall. S2 replacement is as follows: completely remove the bricks at the replacement site, install steel bars in the corresponding positions of the vertical channels with two openings facing the interior of the existing inner wall, then insert the first or second reinforcing brick, and then install steel bars in the vertical channels with two openings facing the exterior of the existing inner wall.
2. The method for internal replacement reinforcement of an old masonry of a cavity wall according to claim 1, characterized in that, The thickness of both the first reinforcing brick and the second reinforcing brick is greater than the thickness of the bucket brick, and less than the difference between the length and thickness of the bucket brick.
3. The method of interior replacement reinforcement of an old masonry cavity wall according to claim 1, characterized in that, The fluidity of the slurry is >300mm.
4. The method for internal replacement reinforcement of an old masonry of a cavity wall according to claim 1, characterized in that, The decorative surface layer is a wire mesh mortar layer.
5. A method of internal replacement and reinforcement of an old masonry cavity wall according to any one of claims 1 to 4, characterized in that, The density of the first and second reinforced bricks is ≤ 800 kg / m3 and the strength is ≥ MU10. The density of the first and second reinforced bricks is ≤ 800 kg / m3 and the strength is ≥ MU10.