A brick-laid strip foundation reinforcing structure of a masonry load-bearing wall and a construction method thereof

Abstract

This invention provides a reinforcement structure and construction method for existing masonry strip foundations of load-bearing walls. The reinforcement structure includes newly added wide strip foundations, new foundation beams, new through-wall beams, and new plain concrete pads, all located on both longitudinal sides of the original load-bearing wall strip foundation. The newly added wide strip foundations, new foundation beams, and new through-wall beams are cast as a single integrated unit. The newly added wide strip foundations and new foundation beams each contain a first and second reinforcing steel reinforcement system, respectively. The new through-wall beams contain transverse through-wall beam reinforcement that penetrates the original foundation. During construction, a micro-disturbance process is employed, involving segmented excavation of the foundation trench and partial removal of large footings. After the reinforcement is tied, the entire structure is cast in one go to form a reliable whole. This invention significantly improves the foundation's bearing capacity, seismic performance, and construction efficiency. It has the advantages of simple construction, convenient installation, and economic applicability, and is suitable for the reinforcement and renovation of existing masonry building foundations.

Description

Technical Field

[0001] This invention relates to the reinforcement and renovation of old masonry buildings, specifically to a brick strip foundation reinforcement structure and construction method for existing masonry load-bearing walls. Background Technology

[0002] With the continuous advancement of urban renewal in my country, the demand for reinforcement and renovation of old masonry buildings is increasing. Safe, reliable, and economical reinforcement technologies are key to ensuring efficient and convenient construction and the long-term safety of buildings. For the reinforcement and renovation of brick strip foundations in masonry structures, it is necessary not only to meet the requirements of structural load-bearing capacity and safety performance, but also to consider the feasibility of on-site construction and adapt to the practical needs of improving building functionality and usability.

[0003] The shortcomings of commonly used brick strip foundation reinforcement for masonry structures are:

[0004] 1) The widening of traditional brick strip foundations often adopts the "external concrete sleeve", which relies on the implanted structural short bars to connect the old and new foundations. This method is intuitive to construct, but the quality of the interface treatment between the old and new concrete is difficult to guarantee, and problems such as poor bonding and interface cracking are prone to occur, resulting in insufficient co-load capacity. This problem of insufficient safety reserve is even more prominent in areas with high seismic fortification requirements.

[0005] 2) For projects with significantly increased loads or strict settlement control, anchor static pressure piles and other foundation underpinning technologies are often used in China. Although they can effectively improve the bearing capacity of the foundation, they are complex to construct, costly, cause significant disturbance to the original structure, and have a long construction period, making them difficult to be widely applied to foundation widening and renovation projects of ordinary old buildings.

[0006] 3) With the increasing demand for seismic retrofitting of existing buildings in my country, higher requirements have been placed on the seismic performance of masonry strip foundations. Existing technologies mostly focus on the reinforcement of the superstructure such as walls, beams and columns, while research on the seismic reinforcement of the foundation is relatively lagging behind. In particular, there is a lack of seismic structural measures and design methods for the integrated "widened foundation + through-wall beam" structure, which makes it difficult to meet the retrofitting needs of buildings in high-intensity seismic zones. Summary of the Invention

[0007] This invention, while ensuring structural safety and reliability, also features simple construction, economic practicality, and widespread applicability. It provides a safe, efficient, and economical solution for the foundation reinforcement of old masonry buildings, demonstrating strong technological advancement and practicality. The specific solution is as follows:

[0008] A brick strip foundation reinforcement structure for an existing masonry load-bearing wall, the reinforcement structure is used to reinforce the original load-bearing wall brick strip foundation, the length direction of the original load-bearing wall brick strip foundation is longitudinal, the reinforcement structure includes a newly widened strip foundation, a new foundation beam, a new through-wall beam and a new plain concrete pad layer.

[0009] The newly added wide strip foundation is set on both longitudinal sides of the bottom of the original load-bearing wall brick strip foundation, and the newly added wide strip foundation is equipped with a first reinforcing steel system inside;

[0010] The newly added foundation beam is set on both longitudinal sides of the bottom of the original load-bearing wall brick strip foundation, and the newly added foundation beam connects the newly widened strip foundation and the original load-bearing wall brick strip foundation. The newly added foundation beam is higher than the newly widened strip foundation, and the interior of the newly added foundation beam is provided with a second reinforcing steel system.

[0011] The newly added through-wall beam passes through the original load-bearing wall brick strip foundation and connects between the two newly added foundation beams on both sides. The newly added through-wall beam is provided with through-wall beam steel bars that pass through the original load-bearing wall brick strip foundation laterally, and the two ends of the through-wall beam steel bars are anchored into the newly added foundation beam.

[0012] The newly added plain concrete cushion layer is set on both longitudinal sides of the original load-bearing wall brick strip foundation, and the newly added wide strip foundation, the newly added foundation beam, and the newly added through-wall beam are all located on top of the newly added plain concrete cushion layer.

[0013] The newly added wide strip foundation, the newly added foundation beam, and the newly added through-wall beam are all integral cast-in-place structures.

[0014] Furthermore, the first reinforcing steel system includes a plurality of newly added foundation bottom reinforcing bars located at the inner bottom of the newly added wide strip foundation, wherein the plurality of newly added foundation bottom reinforcing bars are arranged parallel and spaced apart in the longitudinal direction.

[0015] Each newly added foundation bottom reinforcing bar, near the end of the original load-bearing wall brick strip foundation, passes through the inner bottom of the newly added foundation beam and bends upward to near the upper surface of the newly added foundation beam.

[0016] Furthermore, the first reinforcement system also includes newly widened foundation bottom distribution reinforcement located at the inner bottom of the newly widened strip foundation;

[0017] Several newly added widened foundation bottom distribution bars are distributed in parallel at intervals in the transverse direction, and each newly added widened foundation bottom distribution bar is tied to the newly added widened foundation bottom load-bearing bar.

[0018] Furthermore, the second reinforcement system includes stirrups for the new foundation beam, top reinforcing bars for the new foundation beam, bottom reinforcing bars for the new foundation beam, additional structural stirrups, additional structural longitudinal bars, and longitudinal bars on the sides of the new foundation beam, all located within the new foundation beam; wherein,

[0019] The stirrups of the newly added foundation beam are closed rectangular stirrups distributed longitudinally inside the newly added foundation beam.

[0020] The reinforcing bars at the top of several newly added foundation beams are arranged parallel and spaced apart in the longitudinal direction. Each reinforcing bar at the top of the newly added foundation beam is fixedly installed inside the stirrups and structural stirrups of the newly added foundation beam by binding.

[0021] Several of the newly added foundation beam bottom reinforcing bars are arranged parallel and spaced apart in the longitudinal direction, and each of the newly added foundation beam bottom reinforcing bars is fixedly installed inside the bottom of the stirrups of the newly added foundation beam by a binding method; and

[0022] Several of the newly added structural stirrups are tied and fixedly connected to the stirrups of the newly added foundation beam along the longitudinal direction, and the end of each of the newly added structural stirrups near the original load-bearing wall brick strip foundation is distributed along the bottom outline of the original load-bearing wall brick strip foundation;

[0023] Several newly added longitudinal reinforcement bars are arranged parallel and spaced apart in the longitudinal direction, and each newly added longitudinal reinforcement bar is fixedly installed inside the top of the newly added stirrup by a binding method.

[0024] The longitudinal reinforcement bars on the sides of the newly added foundation beams are arranged in parallel at intervals in the longitudinal direction, and each of the longitudinal reinforcement bars on the sides of the newly added foundation beams is fixedly installed inside the bottom of the newly added structural stirrups by a binding method.

[0025] Furthermore, the reinforcement of the through-wall beam includes the newly added top reinforcement of the through-wall beam, the newly added bottom reinforcement of the through-wall beam, the newly added longitudinal reinforcement of the side reinforcement of the through-wall beam, and the newly added stirrups of the through-wall beam;

[0026] Several newly added through-wall beam top reinforcing bars, several newly added through-wall beam side longitudinal reinforcing bars, and several newly added through-wall beam bottom reinforcing bars all transversely penetrate the original load-bearing wall brick strip foundation and are respectively located at the top, middle, and bottom of the newly added through-wall beams.

[0027] The original load-bearing wall brick strip foundation has several holes for the new through-wall beam top reinforcing bars, new through-wall beam bottom reinforcing bars, and new through-wall beam side structural longitudinal bars to pass through laterally. The gaps between the new through-wall beam top reinforcing bars, new through-wall beam bottom reinforcing bars, and new through-wall beam side structural longitudinal bars and the holes are filled with special structural adhesive for rebar installation.

[0028] The reinforcing bars at the top of the newly added through-wall beams, the longitudinal structural bars on the sides of the newly added through-wall beams, and the reinforcing bars at the bottom of the newly added through-wall beams are connected by several legs of newly added through-wall beam stirrups.

[0029] Furthermore,

[0030] The two ends of the reinforcing bars at the top of the newly added through-wall beam are bent downwards.

[0031] The two ends of the reinforcing bars at the bottom of the newly added through-wall beam are bent upwards.

[0032] Furthermore, the original load-bearing wall brick strip foundation has an original foundation pad layer at the bottom;

[0033] The newly added plain concrete cushion layer is at the same elevation as the original foundation cushion layer and is connected to it.

[0034] The present invention also provides a construction method for constructing the reinforcement structure as described above, comprising the following steps:

[0035] 1) Excavate foundation trenches in sections along both sides of the original load-bearing wall brick strip foundation;

[0036] 2) Remove the large footing of the original load-bearing wall brick strip foundation within the area corresponding to the newly added through-wall beam;

[0037] 3) Roughen the original foundation pad and pour the new concrete pad;

[0038] 4) Tie the first reinforcement steel system, the second reinforcement steel system, the through-wall beam reinforcement, and the through-wall stirrups respectively. Fill the gap between the through-wall beam reinforcement and the through-wall hole of the original load-bearing brick strip foundation with structural adhesive.

[0039] 5) Erect the casting formwork and cast the new wide strip foundation, new foundation beam, and new through-wall beam on both sides of the original load-bearing wall brick strip foundation. The first reinforcement system, the second reinforcement system, the through-wall beam reinforcement, and the through-wall stirrups are located inside the new wide strip foundation, the new foundation beam, and the new through-wall beam, respectively.

[0040] Furthermore, before pouring, the interface between the original load-bearing wall brick strip foundation is cleaned and moistened to ensure the bonding quality between the old and new concrete and the brick masonry.

[0041] This invention proposes an integrated cast-in-place reinforcement structure and construction method consisting of "a newly added wide strip foundation + a new foundation beam + a new through-wall beam + a new plain concrete cushion layer," which has the following advantages compared with existing technologies:

[0042] 1. Improve the overall structural integrity and collaborative load-bearing performance

[0043] By integrally casting the newly added wide strip foundation, foundation beam, and through-wall beam in one go, a continuous spatial force-bearing system is formed, effectively solving the problems of "two skins" between the old and new structures and easy slippage and cracking at the interface in the traditional "external concrete sleeve" method. The longitudinal reinforcement of the through-wall beam penetrates the original load-bearing wall brick strip foundation transversely and is anchored to the through-wall beam, which greatly enhances the overall connection between the old and new foundations and the upper wall, and significantly improves the foundation's bearing capacity, shear and bending resistance, and seismic performance, making it particularly suitable for seismic reinforcement and renovation in high-intensity seismic fortification areas.

[0044] 2. Reduce construction disturbance and improve project safety.

[0045] The "micro-disturbance" construction process, which involves segmented excavation of the foundation trench and partial removal of the foundation footing, avoids the large-scale demolition or high-intensity disturbance to the original structure caused by traditional underpinning techniques (such as anchor static pressure piles). This effectively controls settlement during construction and the impact on the surrounding environment, making it particularly suitable for the renovation of old buildings in urban core areas and significantly improving the safety of the construction process.

[0046] 3. Optimize construction procedures to improve efficiency and reduce costs.

[0047] By rationally integrating multiple processes such as rebar installation, rebar tying, formwork erection, and concrete pouring, the project reduces overlapping operations and waiting time, significantly shortening the construction period. At the same time, it avoids the high costs associated with traditional methods, resulting in a lower overall project cost and good economic efficiency.

[0048] 4. Highly targeted, widely applicable, and with excellent durability.

[0049] This technology is innovatively designed specifically for the characteristics of brick strip foundations in masonry structures, effectively solving the industry challenges of poor integrity and weak shear resistance when widening and reinforcing them. It can be widely applied to various scenarios such as functional upgrades of existing buildings, load increases, and seismic retrofitting. Through reliable structural measures, it improves the long-term durability and service life of the structure, achieving the goal of "one-time reinforcement, long-term benefit." Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a top view of a brick strip foundation reinforcement structure for existing masonry load-bearing walls according to the present invention;

[0052] Figure 2 for Figure 1Cross-sectional view along the AA direction;

[0053] Figure 3 for Figure 2 Schematic diagram of the first reinforcement steel system in the middle;

[0054] Figure 4 for Figure 2 Schematic diagram of the second reinforcement steel system;

[0055] Figure 5 for Figure 1 Cross-sectional view along the BB direction;

[0056] Figure 6 for Figure 5 Cross-sectional view along the CC direction.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1. Original load-bearing wall brick strip foundation; 1a. Original foundation pad; 2. Newly added wide strip foundation; 3. Newly added foundation beam; 4. Newly added through-wall beam; 5. Newly added plain concrete pad; 6. Newly added wide foundation bottom reinforcing bars; 7. Newly added wide foundation bottom distribution reinforcing bars; 8. Newly added foundation beam stirrups; 9. Newly added foundation beam top reinforcing bars; 10. Newly added foundation beam bottom reinforcing bars; 11. Newly added structural stirrups; 12. Newly added structural longitudinal bars; 13. Newly added foundation beam side longitudinal bars; 14. Newly added through-wall beam top reinforcing bars; 15. Newly added through-wall beam bottom reinforcing bars; 16. Newly added through-wall beam side structural longitudinal bars; 17. Newly added through-wall beam stirrups. Detailed Implementation

[0059] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0060] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0061] See attached document Figure 1 To be continued Figure 6As shown, this invention provides a reinforcement structure and construction method for existing masonry load-bearing walls with brick strip foundations. This reinforcement structure is specifically designed for reinforcing and renovating the original load-bearing brick strip foundation 1 in old masonry structures. The original load-bearing brick strip foundation 1 is a typical brick-built wide-foot foundation, with wide feet on both sides of the bottom of the original load-bearing brick strip foundation 1, and an original foundation pad 1a at the bottom of the original load-bearing brick strip foundation 1. Assuming the length direction of the original load-bearing brick strip foundation 1 is longitudinal, the reinforcement structure mainly includes a newly added wide strip foundation 2, a newly added foundation beam 3, a newly added through-wall beam 4, and a newly added plain concrete pad 5. The newly added wide strip foundation 2, the newly added foundation beam 3, and the newly added through-wall beam 4 are integrated and cast as a whole to form a continuous spatial force-bearing system.

[0062] I. The specific description of the reinforcement structure of the present invention is as follows:

[0063] 1. Added 2 wide strip foundations

[0064] The newly added wide strip foundation 2 is installed on both longitudinal sides of the bottom of the original load-bearing brick strip foundation 1, and is constructed of reinforced concrete in place. Its main function is to expand the load-bearing area of ​​the original load-bearing brick strip foundation 1, reduce the base stress, and ensure that the superstructure load is effectively and evenly transferred to the foundation. The newly added wide strip foundation 2 is equipped with a first reinforcing steel reinforcement system, including:

[0065] 1.1) The newly added wide foundation bottom reinforcing steel bar 6 is bent along the outer edge of the original load-bearing wall brick strip foundation 1 and evenly spaced longitudinally at the bottom of the newly added wide strip foundation 2;

[0066] 1.2) Add new wide foundation bottom distribution reinforcement 7: perpendicular to the stressed reinforcement 6, evenly arranged in the transverse direction, and tied to the stressed reinforcement.

[0067] Among them, the end of each newly added foundation bottom reinforcing bar 6 near the original load-bearing wall brick strip foundation 1 must pass through the inner bottom of the newly added foundation beam 3 and bend upward to near the upper surface of the newly added foundation beam 3 to enhance the overall connection between the old and new foundations.

[0068] 2. Add 3 foundation beams

[0069] The newly added foundation beam 3 is located on both longitudinal sides of the bottom of the original load-bearing wall brick strip foundation 1, and its height is higher than that of the newly added wide strip foundation 2. It is made of reinforced concrete cast-in-place. As a lateral load-bearing and tension structural member, the newly added foundation beam 3 connects the newly added wide strip foundation 2, the original load-bearing wall brick strip foundation 1, and the newly added through-wall beam 4 into a whole, coordinating uneven settlement and improving the overall stiffness and seismic performance of the foundation. Figure 4 As shown, it has a second reinforcing steel system inside, specifically including:

[0070] 2.1) New foundation beam stirrups 8: Longitudinal closed rectangular stirrups, evenly spaced along the new foundation beam 3;

[0071] 2.2) The newly added foundation beam top reinforcing bars 9 and the newly added foundation beam bottom reinforcing bars 10 are arranged in parallel along the longitudinal direction at the top and bottom of the beam, respectively, and are fixed inside the stirrups 8 and the newly added structural stirrups 11 by binding.

[0072] 2.3) Several newly added structural stirrups 11: Several newly added structural stirrups 11 are tied and fixedly connected to the stirrups 8 of the newly added foundation beam along the longitudinal direction, and are distributed along the bottom outline of the original load-bearing wall brick strip foundation 1 at the end closest to it, such as... Figure 2 As shown, each newly added structural stirrup 11 is trapezoidal to increase the coverage area of ​​the newly added structural stirrup 11 and improve the anchorage strength;

[0073] 2.4) New structural longitudinal reinforcement 12: arranged parallel and spaced along the longitudinal direction, fixed to the top of the inside of the structural stirrup 11;

[0074] 2.5) Add longitudinal reinforcement 13 on the side of the foundation beam: arranged longitudinally at the waist of the beam and fixed to the bottom of the inner part of the structural stirrup 11.

[0075] 3. Add 4 through-wall beams

[0076] The newly added through-wall beam 4 is evenly spaced along the longitudinal direction of the original load-bearing brick strip foundation 1, and is made of reinforced concrete cast-in-place. It directly bears the load of the upper wall and transfers it to the newly widened foundation. The new through-wall beam 4 passes through the original load-bearing brick strip foundation 1 and connects between the two newly added foundation beams 3. Inside the new through-wall beam 4, there are through-wall beam reinforcement bars that penetrate the original load-bearing brick strip foundation 1 laterally, and both ends of the through-wall beam reinforcement bars are anchored into the newly added foundation beams 3. The through-wall beam reinforcement bars specifically include:

[0077] 3.1) The newly added through-wall beam top reinforcing bars 14, the newly added through-wall beam bottom reinforcing bars 15, and the newly added through-wall beam side structural longitudinal bars 16: all of them transversely penetrate the original load-bearing wall brick strip foundation 1 and are located at the top, bottom, and middle of the newly added through-wall beam 4 respectively. Holes are set at corresponding positions on the original load-bearing wall brick strip foundation 1 for the newly added through-wall beam top reinforcing bars 14, the newly added through-wall beam bottom reinforcing bars 15, and the newly added through-wall beam side structural longitudinal bars 16 to pass through.

[0078] 3.2) New through-wall beam stirrups 17: Used to connect the top reinforcing bars 14, bottom reinforcing bars 15, and side longitudinal reinforcing bars 16 of the new through-wall beams on both sides of the original load-bearing brick strip foundation 1. The four reinforcements are fixedly connected by binding.

[0079] Among them, the newly added through-wall beam top reinforcing bars 14 and the newly added through-wall beam bottom reinforcing bars 15 need to be bent: the two ends of the newly added through-wall beam top reinforcing bars 14 are bent downwards, and the two ends of the newly added through-wall beam bottom reinforcing bars 15 are bent upwards. The gaps in the holes of the original load-bearing wall brick strip foundation 1 through which the through-wall beam reinforcing bars pass are filled with special structural adhesive for rebar installation to ensure reliable anchoring.

[0080] 4. Add 5 plain concrete foundation layers

[0081] The newly added plain concrete cushion layer 5 is set on both longitudinal sides of the original load-bearing wall brick strip foundation 1, with the same elevation as and connected to the original foundation cushion layer 1a, and is cast in place with plain concrete. It provides a flat and solid construction working surface for the newly poured part (i.e., the newly added wide strip foundation 2, the newly added foundation beam 3, and the newly added through-wall beam 4 as a whole), evenly transmits pressure, protects the reinforcing steel, and improves the stress conditions at the bottom.

[0082] The newly added wide strip foundation 2, new foundation beam 3, and new through-wall beam 4 are all cast in one piece, forming a spatial stress system with high rigidity and strong integrity. This fundamentally avoids the problems of poor interface bonding and slippage cracking that are common in the traditional "external concrete sleeve" method.

[0083] II. Specific Implementation Process of Construction Methods

[0084] The construction method of this invention adopts a "micro-disturbance" segmented construction process, and the specific steps are as follows:

[0085] (1) Along the longitudinal sides of the original load-bearing wall brick strip foundation 1, the foundation trench is excavated in sections. The excavation range and depth are strictly controlled. The construction is carried out by the segmented skip excavation method. The foundation pit support is done in a timely manner to reduce the disturbance to the original structure and the surrounding environment and ensure the safety of the construction process.

[0086] (2) At the corresponding position of the newly added through-wall beam 4, the large foot of the original load-bearing wall brick strip foundation 1 is chiseled out to form a hole for the through-wall beam reinforcement to pass through. During the chiseling process, damage to the main structure of the original load-bearing wall brick strip foundation 1 should be avoided.

[0087] (3) Roughen the original foundation pad 1a and pour the new concrete pad 5;

[0088] (4) Perform steel bar binding operations separately: First, pass the top reinforcing bars 14, bottom reinforcing bars 15, and side longitudinal reinforcing bars 16 of the new through-wall beam transversely through the pre-drilled or reserved holes on the original load-bearing brick strip foundation 1. The ends of the reinforcing bars are bent according to the design requirements. The gaps in the through-wall holes are filled with special structural adhesive for rebar installation to ensure a reliable bond and anchorage between the reinforcing bars and the original brick masonry. Then, bind the stirrups 17 of the new through-wall beam.

[0089] Next, the newly added foundation bottom reinforcing bars 6 and the newly added foundation bottom distribution reinforcing bars 7 are tied and arranged; finally, the newly added foundation beam stirrups 8, the newly added foundation beam top reinforcing bars 9, the newly added foundation beam bottom reinforcing bars 10, the newly added structural stirrups 11, the newly added structural longitudinal bars 12, and the newly added foundation beam side longitudinal bars 13 are tied and arranged, and the reinforcing bar systems are reliably connected according to the design requirements.

[0090] (5) Before pouring concrete, thoroughly clean the interface between the original load-bearing wall brick strip foundation 1 and the subsequent pouring, remove loose debris, dust and oil stains, and fully moisten the interface to ensure good bonding quality between the old and new concrete and the brick masonry.

[0091] Then, a sturdy and tight casting formwork is erected, and the new wide strip foundation 2, new foundation beam 3, and new through-wall beam 4 are formed by a single, integral pouring on both sides of the original load-bearing brick strip foundation 1. This ensures that the reinforced components and the original load-bearing brick strip foundation 1 form a reliable overall load-bearing system. The first reinforcement system, the second reinforcement system, the through-wall beam reinforcement, and the through-wall beam stirrups are located inside the corresponding components. After pouring, the concrete should be covered promptly and thoroughly moistened according to specifications to ensure that the concrete strength meets the design requirements.

[0092] III. Technical Effects of the Embodiments

[0093] This embodiment effectively solves the industry pain points of traditional reinforcement methods, such as poor integrity, large construction disturbance, high cost, and insufficient seismic performance, by integrating the design and construction of "widened foundation + foundation beam + through-wall beam". It significantly improves the bearing capacity, seismic performance and durability of existing masonry strip foundations. It is suitable for functional upgrades, load increases and seismic retrofits of old masonry buildings in urban renewal projects, and has strong economic efficiency, operability and promotion value.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art can make various equivalent modifications or substitutions to the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0095] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A brick-masonry strip foundation reinforcement structure for an existing load-bearing masonry wall, the reinforcement structure being used to reinforce the original load-bearing wall brick-masonry strip foundation (1), the original load-bearing wall brick-masonry strip foundation (1) being located on top of the original foundation pad (1a), and having large footings on both sides of the bottom of the original load-bearing wall brick-masonry strip foundation (1), wherein the length direction of the original load-bearing wall brick-masonry strip foundation (1) is longitudinal, characterized in that, The reinforced structure includes a newly added wide strip foundation (2), a new foundation beam (3), a new through-wall beam (4), and a new plain concrete cushion layer (5). The newly added wide strip foundation (2) is set on both sides of the bottom of the original load-bearing wall brick strip foundation (1), and the newly added wide strip foundation (2) is equipped with a first reinforcing steel system. The newly added foundation beam (3) is set on both sides of the bottom of the original load-bearing wall brick strip foundation (1), and the newly added foundation beam (3) is connected between the newly added wide strip foundation (2) and the original load-bearing wall brick strip foundation (1). The newly added foundation beam (3) is higher than the newly added wide strip foundation (2), and the interior of the newly added foundation beam (3) is provided with a second reinforcing steel system. The newly added through-wall beam (4) is arranged longitudinally along the original load-bearing brick strip foundation (1). The newly added through-wall beam (4) passes through the original load-bearing brick strip foundation (1) and is connected between the newly added foundation beams (3) on both sides. The newly added through-wall beam (4) is provided with through-wall beam steel bars that penetrate the original load-bearing brick strip foundation (1) laterally, and the two ends of the through-wall beam steel bars are anchored into the newly added foundation beam (3). The newly added plain concrete cushion layer (5) is set on both sides of the original foundation cushion layer (1a) in the longitudinal direction, and the newly added wide strip foundation (2), the newly added foundation beam (3), and the newly added through-wall beam (4) are all located on the top of the newly added plain concrete cushion layer (5). The newly added wide strip foundation (2), the newly added foundation beam (3) and the newly added through-wall beam (4) are an integrated cast-in-place structure.

2. The brick-masonry strip foundation reinforcement structure according to claim 1, characterized in that: The first reinforcement system includes a plurality of newly added wide foundation bottom reinforcing bars (6) located at the bottom of the newly added wide strip foundation (2), and the plurality of newly added wide foundation bottom reinforcing bars (6) are arranged parallel and spaced apart in the longitudinal direction. Each newly added foundation bottom reinforcing bar (6) near the original load-bearing wall brick strip foundation (1) passes through the inner bottom of the newly added foundation beam (3) and bends upward to near the upper surface of the newly added foundation beam (3).

3. The brick-masonry strip foundation reinforcement structure according to claim 2, characterized in that: The first reinforcement system also includes newly added wide foundation bottom distribution reinforcement (7) located at the bottom of the interior of the newly added wide strip foundation (2); Several newly added wide foundation bottom distribution bars (7) are distributed in parallel intervals in the transverse direction, and each newly added wide foundation bottom distribution bar (7) is tied to the newly added wide foundation bottom reinforcing bar (6).

4. The brick-masonry strip foundation reinforcement structure according to claim 2, characterized in that: The second reinforcement system includes stirrups (8) for the new foundation beam (3), top reinforcing bars (9) for the new foundation beam, bottom reinforcing bars (10) for the new foundation beam, new structural stirrups (11), new structural longitudinal bars (12), and side longitudinal bars (13) for the new foundation beam, all located inside the new foundation beam (3). The newly added foundation beam stirrups (8) are closed rectangular stirrups longitudinally distributed inside the newly added foundation beam (3). The newly added foundation beam top reinforcing bars (9) are arranged parallel and spaced in the longitudinal direction. Each newly added foundation beam top reinforcing bar (9) is fixedly installed inside the top of the newly added foundation beam stirrups (8) and newly added structural stirrups (11) by a binding method. Several of the newly added foundation beam bottom reinforcing bars (10) are arranged parallel and spaced in the longitudinal direction, and each of the newly added foundation beam bottom reinforcing bars (10) is fixedly installed inside the bottom of the newly added foundation beam stirrups (8) by a binding method; and Several of the newly added structural stirrups (11) are tied and fixedly connected to the newly added foundation beam stirrups (8) in the longitudinal direction. Each of the newly added structural stirrups (11) is distributed along the bottom outline of the original load-bearing wall brick strip foundation (1) at one end near the original load-bearing wall brick strip foundation (1). Several newly added longitudinal reinforcement bars (12) are arranged parallel to each other in the longitudinal direction, and each newly added longitudinal reinforcement bar (12) is fixedly installed inside the top of the newly added stirrup (11) by a binding method. The additional foundation beam side longitudinal reinforcement (13) is arranged in parallel intervals in the longitudinal direction, and each additional foundation beam side longitudinal reinforcement (13) is fixedly installed inside the bottom of the additional structural stirrup (11) by binding.

5. The brick-masonry strip foundation reinforcement structure according to claim 4, characterized in that: The reinforcement of the through-wall beam includes the newly added top reinforcement of the through-wall beam (14), the newly added bottom reinforcement of the through-wall beam (15), the newly added side longitudinal reinforcement of the through-wall beam (16), and the newly added stirrups of the through-wall beam (17). Several newly added through-wall beam top reinforcing bars (14), several newly added through-wall beam side structural longitudinal bars (16), and several newly added through-wall beam bottom reinforcing bars (15) all transversely penetrate the original load-bearing wall brick strip foundation (1) and are respectively set at the top, middle, and bottom of the newly added through-wall beam (4). The original load-bearing wall brick strip foundation (1) is provided with several holes for the new through-wall beam top reinforcing bars (14), new through-wall beam bottom reinforcing bars (15), and new through-wall beam side structural longitudinal bars (16) to pass through laterally. The gaps between the new through-wall beam top reinforcing bars (14), new through-wall beam bottom reinforcing bars (15), and new through-wall beam side structural longitudinal bars (16) and the holes are filled with special structural adhesive for rebar installation. The newly added through-wall beam top reinforcing bars (14), the newly added through-wall beam side structural longitudinal bars (16), and the newly added through-wall beam bottom reinforcing bars (15) on both sides of the original load-bearing wall brick strip foundation (1) are tied and fixed together by several legs of newly added through-wall beam stirrups (17).

6. The brick-masonry strip foundation reinforcement structure according to claim 5, characterized in that: The two ends of the newly added through-wall beam top reinforcing bar (14) are bent downwards. The two ends of the newly added through-wall beam bottom reinforcing steel bar (15) are bent upwards.

7. The brick-masonry strip foundation reinforcement structure according to claim 1, characterized in that: The newly added plain concrete cushion layer (5) is at the same elevation as the original foundation cushion layer (1a) and is connected.

8. A construction method for a brick-masonry strip foundation reinforcement structure according to any one of claims 1-7, characterized in that: Includes the following steps: 1) Excavate foundation trenches in sections along both sides of the longitudinal direction of the original load-bearing wall brick strip foundation (1); 2) Remove the large footing of the original load-bearing wall brick strip foundation (1) within the range corresponding to the newly added through-wall beam (4); 3) Roughen the original foundation pad (1a) and pour the new concrete pad (5); 4) Tie the first reinforcement steel system, the second reinforcement steel system, the through-wall beam reinforcement, and the through-wall beam stirrups respectively. Fill the gap between the through-wall beam reinforcement and the through-wall hole of the original load-bearing wall brick strip foundation (1) with structural adhesive. 5) Set up the casting formwork and cast the new wide strip foundation (2), new foundation beam (3), and new through-wall beam (4) on both sides of the original load-bearing wall brick strip foundation (1) in a single pour. The first reinforcement system, the second reinforcement system, the through-wall beam reinforcement, and the through-wall beam stirrups are located inside the new wide strip foundation (2), the new foundation beam (3), and the new through-wall beam (4), respectively.

9. The construction method according to claim 8, characterized in that: In step 5, the interface of the original load-bearing wall brick strip foundation (1) is cleaned and moistened before pouring.

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