Existing building column peripheral foundation permanent temporary combined assembly type reinforcing system and construction method

Abstract

This invention discloses a permanent-temporary combined prefabricated reinforcement system and construction method for the foundation surrounding existing building columns. The system includes a permanent-temporary combined reinforcement system and a temporary pressure stabilization device. The permanent-temporary combined reinforcement system consists of arc-shaped steel pipes embedded around the foundation, a consolidation body, and micro-steel pipes. The temporary pressure stabilization device includes an adjustable arc-shaped support on a mobile trolley and hydraulic rods. During construction, the permanent-temporary combined reinforcement system is first constructed, then pressure stabilization is applied using the temporary pressure stabilization device, followed by grouting of the foundation. The buoyancy of the grouting balances the applied downward pressure. Finally, the temporary pressure stabilization device is removed, leaving the permanent-temporary combined reinforcement system for permanent reinforcement. This invention combines temporary support with permanent reinforcement, suppressing soil disturbance by balancing the buoyancy of the grouting, ensuring the safety of the existing structure, and improving the quality of reinforcement.

Description

Technical Field

[0001] This invention relates to the field of civil engineering reinforcement technology, specifically to a permanent and temporary prefabricated reinforcement system and construction method for existing building columns and foundations, which is particularly suitable for foundation reinforcement projects around existing building columns in collapsed and weak soil. Background Technology

[0002] In the field of building construction, after long-term service, the foundations around the columns of existing buildings are prone to a decline in bearing capacity due to problems such as soil settlement, structural aging, and loose soil. Some existing building foundations also have the potential for collapse and weakness. The foundation soil generally has problems such as loose structure, poor cohesion, voids, cracks, and unbalanced stress state. It is necessary to reinforce the columns and the bottom of the foundation to ensure the safety of the building structure.

[0003] Currently, grouting is commonly used to reinforce the foundation of existing buildings, creating a reinforced zone through high-pressure grouting to improve the bearing capacity of the foundation. However, for collapsed or weak foundation soils, the impact of the grouting pressure and the squeezing, filling, and displacement effects of the grout can easily disrupt the original soil's mechanical balance during high-pressure grouting. This can lead to risks such as soil disturbance, uplift, deformation instability, reinforcement failure, and additional damage to columns and related structures, seriously affecting the reinforcement effect and building structural safety. Furthermore, in existing reinforcement technologies, temporary and permanent reinforcement structures are usually independent. Temporary reinforcement structures are only used for temporary fixation during construction and must be completely removed after completion. This not only increases construction procedures, material consumption, and costs but also reduces construction efficiency, making it difficult to meet the needs of efficient, safe, and economical reinforcement of existing building columns and foundations.

[0004] Therefore, there is an urgent need for a foundation reinforcement method that combines temporary stabilization with permanent reinforcement, and can actively and reliably resist grouting uplift disturbance, thereby achieving safe, efficient, and economical construction. Summary of the Invention

[0005] The purpose of this invention is to provide a permanent and temporary prefabricated reinforcement system and construction method for the foundation around existing building columns to solve the above-mentioned technical problems.

[0006] To address the aforementioned technical problems, this invention discloses a prefabricated reinforcement system for the foundation of existing building columns, combining permanent and temporary components. This system includes arc-shaped steel pipes implanted around the foundation perimeter. The arc-shaped steel pipes are installed using either pressure-sinking or groove-cutting methods. The pipes are tightly fitted to the main foundation structure and have through holes. Ribs are present at the bottom of the arc-shaped steel pipes. Grouting is performed through the through holes to form a consolidation body at the distal end of the pipe. The ribs are then wrapped and integrated with this consolidation body to form a unified anchoring structure.

[0007] Furthermore, a transverse connecting beam is provided between adjacent arc-shaped steel pipes, and a pre-drilled hole is provided on the transverse connecting beam. A micro steel pipe is inserted through the pre-drilled hole into the soil, and a connecting beam is provided at the top of the micro steel pipe. The aforementioned arc-shaped steel pipe, solidified body, transverse connecting beam, micro steel pipe and connecting beam form a permanent and temporary combined reinforcement system for the reinforcement of existing foundations.

[0008] In subsequent construction, a foundation reinforcement zone is formed by installing grouting pipes and injecting grout. For collapsed and weak foundation soil, the impact of the grouting pressure and the squeezing, filling, and displacement effects of the grout can disrupt the original soil's mechanical balance, leading to risks such as soil disturbance, deformation instability, reinforcement failure, and additional damage to columns and related structures. This invention mitigates these risks by employing a combined permanent and temporary reinforcement system to temporarily fix the foundation before grouting reinforcement. This combined system also serves as part of the foundation reinforcement, forming a permanent shallow reinforcement that complements the deep grouting reinforcement, creating a unified and effective reinforcement system.

[0009] Furthermore, to stabilize the permanent-temporary combined reinforcement system, this invention also provides a temporary pressurization and stabilization device. Before installation, a connector and a connecting cylinder are sequentially installed on the top of the arc-shaped steel pipe, and a telescopic rod is connected through the connecting cylinder. The top of the telescopic rod is equipped with a top beam. The telescopic rod provides an elastic buffer space for pressurization, preventing the ballast from damaging the arc-shaped steel pipe.

[0010] The temporary pressurization and stabilization device includes a mobile trolley, which is set on the ground and includes a support frame, arc-shaped supports, and temporary supports. The upper end of the support frame has two arc-shaped supports connected at both ends. The two arc-shaped supports are connected by a hinge, which is achieved through a hinge shaft and a hinge rod. The two arc-shaped supports can move and open around the hinge shaft and hinge rod, changing the intersection angle of the two arc-shaped supports sequentially to achieve adjustable support positions. The two arc-shaped supports are located on both sides of the column, and in the construction state, they encircle the column, avoiding any spatial conflict with the column.

[0011] To facilitate the opening and closing of the two arc-shaped supports without affecting the connection between the support frame and the arc-shaped supports, a sliding stroke space is provided on the arc-shaped supports. The sliding rods of the support frame extend into the sliding stroke space and are hinged by the movable shaft. During the opening and closing of the two arc-shaped supports around the hinge shaft and the hinge rod, the sliding rods of the support frame slide around the movable shaft in the sliding stroke space.

[0012] The other end of the arc-shaped support has a hydraulic rod, which is connected in sequence to the crossbeam, pressure block, and pressure plate. The hydraulic rod applies downward pressure, and the pressure plate is matched and aligned with the top beam by adjusting the arc-shaped support, thereby pressurizing the top beam. The top beam transfers the ballast to the permanent and temporary combined reinforcement system below, preventing the permanent and temporary combined reinforcement system from floating or shifting during the subsequent grouting reinforcement process.

[0013] Furthermore, by installing grouting pipes, grout is injected into the foundation to form a foundation reinforcement zone. During the grouting process, the upward buoyancy and downward pressure caused by the grouting are balanced, and the permanent and temporary combined reinforcement system is in a stable state. This can effectively protect the foundation during the grouting reinforcement process and also avoid affecting its permanent reinforcement function due to upward displacement.

[0014] After the foundation grouting in this area is completed, the two arc-shaped supports are opened, and the area is moved to the next reinforcement area by a mobile trolley. Then, the plug-in parts, connecting cylinders, telescopic rods, and top beams are removed, leaving a permanent and temporary combined reinforcement structure to form permanent reinforcement.

[0015] Accordingly, the construction method for the prefabricated reinforcement system combining permanent and temporary foundation reinforcement around existing building columns includes the following steps: Step 1: Installation of the curved steel pipe At the designated location, an arc-shaped steel pipe is implanted around the foundation using either a sinking or trenching method, ensuring that the arc-shaped steel pipe is tightly attached to the main body of the foundation.

[0016] Step 2: Grouting at the bottom of the curved steel pipe to form a solidified body. Grout is injected into the bottom of the curved steel pipe and the surrounding soil through pre-drilled holes. The grout solidifies at the far end of the bottom of the curved steel pipe to form a solidified body. The ribs at the bottom of the curved steel pipe are tightly wrapped and bonded by this solidified body, together forming an integral anchoring structure.

[0017] Step 3: Install the transverse connecting beams and miniature steel pipes A transverse connecting beam is installed between adjacent curved steel pipes. Through pre-drilled holes in the transverse connecting beam, micro-steel pipes are driven into the deeper soil. A connecting beam is installed on top of the micro-steel pipes. At this point, the permanent and temporary combined reinforcement system, consisting of curved steel pipes, a solidified body, transverse connecting beams, micro-steel pipes, and connecting beams, is completed. This system initially stabilizes and encapsulates and reinforces the main foundation structure.

[0018] Step 4: Install the connecting components of the temporary pressure stabilization device. Insert fittings and connecting cylinders are installed sequentially on the top of the curved steel pipe. Telescopic rods are connected through the connecting cylinders, and a top beam is installed on the top of the telescopic rods. The telescopic rods provide elastic buffer space for subsequent pressurization.

[0019] Step 5: Positioning the mobile trolley and adjusting the arc-shaped support Move the mobile trolley to the ground in the construction area. Operate the mobile trolley so that the two arc-shaped supports on its support frame surround both sides of the column. Through the hinged connection between the hinge shaft and the hinge rod, adjust the two arc-shaped supports to move and open, changing their intersection angle, so that they reach a suitable support position while embracing the column without spatial interference. During this adjustment process, the sliding members of the support frame slide around the movable shaft within the sliding stroke space of the arc-shaped supports.

[0020] Step Six: Aligning the Pressure Plate and Applying Temporary Pressure Adjust the curved support to precisely align the pressure plate connected to the hydraulic rod at its end with the top beam of the permanent-temporary combined reinforcement system. Activate the hydraulic rods to drive the crossbeam, pressure block, and pressure plate downwards, applying stable pressure to the top beam. This pressure is transmitted through the top beam, telescopic rods, connecting cylinders, and plug-in fittings to the curved steel pipe, and then to the lower permanent-temporary combined reinforcement system. The telescopic rods provide elastic cushioning during this process, preventing pressure overload from damaging the curved steel pipe and other structures.

[0021] Step 7: Grouting the base to form a reinforced base zone While the temporary pressurization and stabilization device maintains downward pressure on the permanent-temporary combined reinforcement system, high-pressure grouting is performed by driving grouting pipes to a predetermined depth at the bottom of the foundation. The grout diffuses, fills, replaces, and consolidates in the soil, ultimately forming the foundation reinforcement zone. During this grouting process, the buoyancy generated by the grouting and the downward pressure applied by the temporary pressurization and stabilization device through the pressure plate maintain a dynamic balance, ensuring that the permanent-temporary combined reinforcement system remains stable at all times. This effectively protects the main foundation, suppresses soil disturbance and deformation, and prevents additional damage to structures such as columns.

[0022] Step 8: Transfer the temporary pressurization and stabilization device After the foundation grouting in the current area is completed and the grout has initially stabilized, the hydraulic rods are used to release the pressure. Then, the two arc-shaped supports are controlled to open outward, separating from the state of encircling the column. The mobile trolley is then moved out of the current construction area and positioned to the next construction area to be reinforced.

[0023] Step Nine: Removal of Temporary Components and Formation of Permanent Reinforcement In the area where grouting reinforcement has been completed, the top beam, expansion joints, connecting cylinders, and plug-in components are removed sequentially. The permanent-temporary combined reinforcement system, consisting of curved steel pipes, solidified bodies, transverse connecting beams, micro-steel pipes, and connecting beams, is permanently left in place as a shallow permanent reinforcement component of the foundation, forming a complete and complementary reinforcement system together with the base reinforcement zone formed by deep grouting. Subsequently, steps four through nine can be repeated in the next reinforcement area. The beneficial effects of this invention are as follows: (1) The permanent and temporary reinforcement system adopted in this application has both temporary fixing and permanent reinforcement functions. During the construction process, it is used to temporarily fix the main body of the foundation, reduce the risk of grouting reinforcement, and does not need to be removed after the construction is completed. As a shallow permanent reinforcement part of the main body of the foundation, it forms a complementary reinforcement whole with the base reinforcement area formed by deep grouting of the base, which improves the construction safety and the reinforcement effect.

[0024] (2) Some components of this application are designed, installed and connected in a prefabricated manner. Among them, the arc-shaped steel pipe, the transverse connecting beam and the micro steel pipe are designed in a prefabricated manner, which makes installation and disassembly convenient and construction efficiency high. The arc-shaped steel pipe can be pressed down or cut into the groove, which has little disturbance to the surrounding soil. The temporary pressure stabilization device has an adjustable arc-shaped support and a sliding connection mechanism, which can flexibly adapt to columns of different sizes and realize rapid "hugging" alignment and pressure application. The prefabricated method realizes the assembly line and standardized operation of multiple reinforcement sections, which greatly improves construction efficiency.

[0025] (3) The temporary pressure stabilization device provided in this application, together with the permanent-temporary combined reinforcement system, applies controllable downward pressure to the top of the permanent-temporary combined reinforcement system, which can balance the buoyancy generated during the grouting process, ensure that the permanent-temporary combined reinforcement system is in a stable state, suppress the destruction of the soil mechanical balance by high-pressure grouting, reduce the risks of soil disturbance, deformation instability, reinforcement failure, additional damage to columns and supporting structures, and ensure the safety and stability of the foundation reinforcement process.

[0026] (4) The mobile trolley in the temporary pressure stabilization device of this application can be moved flexibly to adapt to the repeated use of multiple reinforcement areas, thereby improving the convenience of construction.

[0027] (5) The arc-shaped support in the temporary pressure stabilization device of this application can be flexibly opened and closed, and it can hug the column without spatial conflict with the column. It can adapt to the foundation reinforcement needs of columns of different sizes, and at the same time effectively protect the integrity of the column and supporting structure, and avoid additional damage.

[0028] (6) In the permanent and temporary reinforcement system of this application, the arc-shaped steel pipes form a solid body and ribs through bottom grouting to form a deep anchorage structure; the transverse connecting beams and connecting beams connect the discrete arc-shaped steel pipes into an overall load-bearing frame; the micro steel pipes further enhance the longitudinal restraint capacity of the system; the system can effectively transfer and diffuse the upper load and grouting reaction force to the deep stable soil, and has good overall stiffness and stability.

[0029] (7) The final form of this application is a composite reinforcement system consisting of a "shallow prefabricated reinforcement system combining permanent and temporary" and a "deep grouting reinforcement zone". The two not only work together to ensure safety during the construction phase, but also complement each other during the long-term use phase. The shallow system constrains shallow deformation, and the deep reinforcement zone improves the bearing capacity of the foundation. Attached Figure Description

[0030] Figure 1 A schematic diagram of the overall construction of a prefabricated reinforcement system combining permanent and temporary structures for the foundation around the columns of an existing building. Figure 2 for Figure 1 Another perspective on the overall construction plan; Figure 3 This is a schematic diagram of the construction of a permanent-temporary combined reinforcement system; Figure 4 for Figure 3 Enlarged view of node A in the middle; Figure 5 This is a schematic diagram of an arc-shaped steel pipe structure; Figure 6 Schematic diagram of the installation of connecting components for the temporary pressurization and stabilization device; Figure 7 Schematic diagram of the temporary pressurization and stabilization device; Figure 8 for Figure 7 Enlarged view of node B in the middle.

[0031] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Column; 2. Foundation; 3. Ground; 4. Curved steel pipe; 5. Through hole; 6. Rib; 7. Solidified body; 8. Miniature steel pipe; 9. Connecting beam; 10. Connector; 11. Connecting cylinder; 12. Telescopic rod; 13. Top beam; 14. Moving trolley; 15. Support frame; 16. Curved support; 17. Hinge shaft; 18. Hinge rod; 19. Sliding rod; 20. Sliding stroke space; 21. Movable shaft; 22. Hydraulic rod; 23. Crossbeam; 24. Pressure block; 25. Pressure plate; 26. Temporary support; 27. Grouting pipe; 28. Foundation reinforcement area; 29. ​​Transverse connecting beam. Detailed Implementation

[0032] The following provides a detailed description of the specific implementation methods of the prefabricated reinforcement system and construction method for the foundation surrounding existing building columns as described in this invention. Those skilled in the art can understand and implement the technical solution of this invention based on this description, but the scope of protection of this invention is not limited to this specific embodiment.

[0033] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0034] Example 1: Prefabricated reinforcement system for the foundation around existing building columns (permanent and temporary) Please see Figures 1-8As shown, this embodiment provides a prefabricated reinforcement system for the foundation surrounding existing building columns, used to reinforce existing columns 1 and foundation 2. The system mainly consists of three parts: a permanent and temporary reinforcement system, a temporary pressure stabilization device, and a base reinforcement zone 28. The structural components are assembled and connected according to their corresponding numbers. The specific structure is as follows: The permanent-temporary combined reinforcement system is the core load-bearing and reinforcement component of the reinforcement system, including an arc-shaped steel pipe 4, a solidified body 7, a transverse connecting beam 29, a micro steel pipe 8, and a connecting beam 9. The arc-shaped steel pipe 4 is installed around the foundation 2 using either pressure sinking or trenching methods, and is tightly attached to the main body of the foundation 2. The arc-shaped steel pipe 4 has through holes 5 and ribs 6 at its bottom. The solidified body 7 is formed at the far end of the bottom of the arc-shaped steel pipe 4 by grouting through the through holes 5. The ribs 6 are wrapped and bonded by the solidified body 7. An integral anchoring structure is formed to enhance the connection stability between the arc-shaped steel pipe 4 and the soil of the foundation 2; a transverse connecting beam 29 is set between adjacent arc-shaped steel pipes 4, and the transverse connecting beam 29 has a reserved hole through which the micro steel pipe 8 is inserted into the deep soil, and a connecting beam 9 is set on the top of the micro steel pipe 8; the arc-shaped steel pipe 4, the solidified body 7, the transverse connecting beam 29, the micro steel pipe 8 and the connecting beam 9 together form a permanent and temporary combined reinforcement system for the reinforcement of the existing foundation 2, which can realize the dual functions of temporary fixation and permanent reinforcement of the main body of the foundation 2.

[0035] The temporary pressure stabilization device is used to stabilize the permanent-temporary combined reinforcement system during the base grouting process. It includes a mobile trolley 14, connector 10, connecting cylinder 11, telescopic rod 12, top beam 13, support frame 15, arc-shaped support 16, temporary support 26, hinge shaft 17, hinge rod 18, sliding rod 19, movable shaft 21, hydraulic rod 22, crossbeam 23, pressure block 24, and pressure plate 25. Before installing the temporary pressure stabilization device, connector 10 and connecting cylinder 11 are sequentially installed on the top of the arc-shaped steel pipe 4, and telescopic rod 12 is connected through connecting cylinder 11. The top of component 12 is provided with a top beam 13. The telescopic rod 12 provides an elastic buffer space for pressurization, preventing the ballast from damaging the arc-shaped steel pipe 4. The mobile trolley 14 is set on the ground 3. The support frame 15, arc-shaped supports 16, and temporary supports 26 are all components of the mobile trolley 14. The upper end of the support frame 15 has two arc-shaped supports 16 connected at the ends. The two arc-shaped supports 16 are connected by a hinge, which is realized through the hinge shaft 17 and the hinge rod 18. The two arc-shaped supports 16 can move and open around the hinge shaft 17 and the hinge rod 18, changing the position of the two arc-shaped supports 16 in sequence. The intersection angle allows for adjustable support positions of the two arc-shaped supports 16. The two arc-shaped supports 16 are located on both sides of the column 1, embracing the column 1 during construction without causing spatial conflict. To facilitate the opening and closing of the two arc-shaped supports 16 without affecting the connection between the support frame 15 and the arc-shaped supports 16, a sliding travel space 20 is provided on the arc-shaped supports 16. The sliding rod 19 of the support frame 15 extends into the sliding travel space 20 and is hinged by a movable shaft 21. The two arc-shaped supports 16 can move around the hinge shaft 17 and the hinge rod 18. During the dynamic tensioning and closing process, the sliding rod 19 of the support frame 15 slides around the movable axis 21 within the sliding stroke space 20; the hydraulic rod 22 is set at the other end of the arc support 16, and the hydraulic rod 22 is connected in sequence to the crossbeam 23, the pressure block 24, and the pressure plate 25. The hydraulic rod 22 applies downward pressure, and the pressure plate 25 is matched and aligned with the top beam 13 by adjusting the arc support 16, thereby pressurizing the top beam 13. The top beam 13 transfers the ballast to the permanent and temporary combined reinforcement system below, preventing the permanent and temporary combined reinforcement system from floating or shifting during the subsequent grouting reinforcement process.

[0036] The base reinforcement zone 28 is formed at the bottom of the foundation 2 by driving grouting pipes 27 and injecting grout. It is suitable for reinforcing collapsed and weak foundation soils that have problems such as loose structure, poor cohesion, voids, cracks, and unbalanced stress state. During the process of driving grouting pipes 27 and injecting grout at high pressure to form the base reinforcement zone 28, the upward buoyancy caused by grouting is balanced with the downward pressure applied by the temporary pressurization and stabilization device, so that the permanent and temporary combined reinforcement system is in a stable state. The permanent and temporary combined reinforcement system, as part of the main body of the foundation 2 reinforcement, forms a permanent shallow reinforcement. Together with the base reinforcement zone 28 formed by deep grouting reinforcement, it forms a complementary reinforcement whole, which together improves the bearing capacity and deformation resistance of the foundation 2.

[0037] Example 2: Construction Method of Prefabricated Reinforcement System for Permanent and Temporary Structures around Existing Building Columns This embodiment corresponds to the structural system of Embodiment 1, and provides a construction method for a prefabricated reinforcement system that combines permanent and temporary foundation reinforcement around existing building columns. The specific steps are as follows: Step 1: Installation of the curved steel pipe 4. First, conduct a preliminary survey of the existing column 1 and foundation 2 to clarify the construction area around foundation 2. Prepare all structural components and construction equipment required for the reinforcement system, such as curved steel pipe 4, ribs 6, through holes 5, transverse connecting beams 29, micro steel pipes 8, and connecting beams 9. At the set positioning points, use either pressure sinking or trenching methods to install the curved steel pipe 4 around foundation 2, ensuring that the curved steel pipe 4 is tightly attached to the main body of foundation 2.

[0038] Step 2: Grouting is injected into the bottom of the arc-shaped steel pipe 4 to form a solidified body 7. Grouting is carried out into the bottom of the pipe and the surrounding soil through the pre-set through hole 5 on the arc-shaped steel pipe 4. The grout solidifies at the far end of the bottom of the arc-shaped steel pipe 4 to form a solidified body 7. The ribs 6 at the bottom of the arc-shaped steel pipe 4 are tightly wrapped and combined with the solidified body 7 to form an integral anchoring structure.

[0039] Step 3: Install the transverse connecting beam 29 and the micro steel pipe 8. Install the transverse connecting beam 29 between adjacent arc-shaped steel pipes 4. Drive the micro steel pipe 8 into the deeper soil through the reserved holes on the transverse connecting beam 29. Install the connecting beam 9 on the top of the micro steel pipe 8. At this point, the permanent and temporary combined reinforcement system composed of arc-shaped steel pipe 4, solid body 7, transverse connecting beam 29, micro steel pipe 8 and connecting beam 9 is installed. The system initially stabilizes and wraps and reinforces the main body of foundation 2.

[0040] Step 4: Install the connecting parts of the temporary pressurization and stabilization device. Install the plug-in part 10 and the connecting cylinder 11 in sequence on the top of the arc-shaped steel pipe 4. Connect the telescopic rod 12 through the connecting cylinder 11, and install the top beam 13 on the top of the telescopic rod 12. The telescopic rod 12 provides elastic buffer space for subsequent pressurization.

[0041] Step 5: Position the mobile trolley 14 and adjust the arc-shaped supports 16. Move the mobile trolley 14 to the ground 3 of the construction area. Operate the mobile trolley 14 so that the two arc-shaped supports 16 on its support frame 15 surround the two sides of the column 1. Adjust the two arc-shaped supports 16 to move and open through the hinged connection between the hinge shaft 17 and the hinge rod 18, change their intersection angle, so that they reach a suitable support position while embracing the column 1, without spatial conflict with the column 1. During this adjustment process, the sliding rod 19 of the support frame 15 slides around the movable shaft 21 within the sliding stroke space 20 of the arc-shaped supports 16.

[0042] Step Six: Align the pressure plate 25 and apply temporary pressure. Adjust the arc-shaped support 16 so that the pressure plate 25 connected to the hydraulic rod 22 at its end is precisely matched and aligned with the top beam 13 at the top of the permanent and temporary reinforcement system. Activate the hydraulic rod 22 to drive the crossbeam 23, pressure block 24, and pressure plate 25 to move downwards, applying stable pressure to the top beam 13. This pressure is transmitted to the arc-shaped steel pipe 4 through the top beam 13, telescopic rod 12, connecting cylinder 11, and plug-in 10, and then to the lower permanent and temporary reinforcement system. The telescopic rod 12 provides elastic buffering during this process to prevent pressure overload from damaging the arc-shaped steel pipe 4 and other structures.

[0043] Step 7: Base grouting to form base reinforcement zone 28. Under the condition that the temporary pressurization and stabilization device maintains the downward pressure on the permanent and temporary combined reinforcement system, high-pressure grouting is carried out by driving grouting pipe 27 to the predetermined depth at the bottom of foundation 2. The grout diffuses, fills, replaces and consolidates in the soil, and finally forms base reinforcement zone 28. During this grouting process, the grouting pressure and the temporary pressurization pressure are monitored in real time to ensure that the buoyancy generated by the grouting and the downward pressure applied by the temporary pressurization and stabilization device through the pressure plate 25 are kept in dynamic balance, so as to ensure that the permanent and temporary combined reinforcement system is always in a stable state, thereby effectively protecting the main body of foundation 2, suppressing soil disturbance and deformation, and preventing risks such as additional damage to column 1 and supporting structures.

[0044] Step 8: Transfer the temporary pressurization and stabilization device. After the foundation 2 of the current area is grouted and the grout is initially stabilized, operate the hydraulic rod 22 to release the pressure. Then, control the two arc-shaped supports 16 to open outward and break away from the state of embracing the column 1. Move the mobile trolley 14 out of the current construction area and position it to the next construction area to be reinforced.

[0045] Step Nine: Remove temporary components and form permanent reinforcement. In the area where grouting reinforcement has been completed, remove the top beam 13, telescopic rod 12, connecting cylinder 11 and plug-in component 10 in sequence. The permanent-temporary combined reinforcement system composed of arc-shaped steel pipe 4, solid body 7, transverse connecting beam 29, micro steel pipe 8 and connecting beam 9 is permanently left in place as the shallow permanent reinforcement part of the main body of foundation 2. Together with the base reinforcement area 28 formed by deep grouting, it forms a complete and complementary reinforcement whole. Subsequently, the construction process of steps four to nine can be repeated in the next reinforcement area to realize the streamlined and standardized operation of multiple reinforcement sections.

Claims

1. A prefabricated reinforcement system for the foundation of an existing building column, used to reinforce the foundation (2) around an existing column (1), characterized in that, The system includes a permanent and temporary combined reinforcement system; the permanent and temporary combined reinforcement system includes an arc-shaped steel pipe (4), a solid body (7), a transverse connecting beam (29), a micro steel pipe (8), and a connecting beam (9); the arc-shaped steel pipe (4) is implanted around the foundation (2), the arc-shaped steel pipe (4) is constructed by pressure sinking or trenching, the arc-shaped steel pipe (4) is closely attached to the main body of the foundation (2), the arc-shaped steel pipe (4) has a through hole (5), and the bottom of the arc-shaped steel pipe (4) has ribs ( 6) Grouting is performed through the through hole (5) of the arc-shaped steel pipe (4) to form a consolidation body (7) at the bottom of the arc-shaped steel pipe (4). The rib (6) is wrapped and combined by the consolidation body (7) to form an integral anchoring structure. There is a transverse connecting beam (29) between adjacent arc-shaped steel pipes (4). There is a reserved hole on the transverse connecting beam (29). The micro steel pipe (8) is inserted through the reserved hole to the soil. A connecting beam (9) is set at the top of the micro steel pipe (8). It also includes a temporary pressurization and stabilization device; before the temporary pressurization and stabilization device is installed, the top of the arc-shaped steel pipe (4) is sequentially fitted with a plug-in (10) and a connecting cylinder (11), and the telescopic rod (12) is connected through the connecting cylinder (11). The top of the telescopic rod (12) is provided with a top beam (13), and the telescopic rod (12) provides an elastic buffer space for pressurization; the temporary pressurization and stabilization device includes a mobile trolley (14), which is set on the ground (3) and includes a support frame. The support frame (15) includes an arc-shaped support (16) and a temporary support (26). The upper end of the support frame (15) has two arc-shaped supports (16) connected at the ends. The two arc-shaped supports (16) are connected by a hinge, achieved through a hinge shaft (17) and a hinge rod (18). The two arc-shaped supports (16) can move and open around the hinge shaft (17) and the hinge rod (18), changing the intersection angle of the two arc-shaped supports (16) sequentially, thus achieving adjustable functionality of the two arc-shaped supports (16). Different support positions; the two arc-shaped supports (16) are located on both sides of the column (1), and in the construction state, they are in a state of embracing the column (1); a sliding stroke space (20) is provided on the arc-shaped support (16), and the sliding rod (19) of the support frame (15) extends into the sliding stroke space (20) and is hinged by the movable shaft (21). During the process of the two arc-shaped supports (16) moving and opening around the hinge shaft (17) and the hinge rod (18), the support frame (15) The sliding rod (19) slides around the movable axis (21) within the sliding stroke space (20); the other end of the arc support (16) has a hydraulic rod (22), which is connected in sequence to the crossbeam (23), the pressure block (24), and the pressure plate (25). The hydraulic rod (22) applies downward pressure, and the pressure plate (25) is matched and aligned with the top beam (13) by adjusting the arc support (16), thereby pressurizing the top beam (13).

2. The prefabricated reinforcement system for the foundation surrounding existing building columns as described in claim 1, characterized in that, Grouting is performed on the base by installing grouting pipes (27) to form a base reinforcement zone (28); during the grouting process, the upward buoyancy caused by grouting is balanced with the downward pressure, and the permanent and temporary combined reinforcement system is in a stable state.

3. The prefabricated reinforcement system for the foundation of existing building columns, combining permanent and temporary reinforcement, as described in any one of claims 1 to 2, is characterized in that... The arc-shaped steel pipe (4), the solid body (7), the transverse connecting beam (29), the micro steel pipe (8) and the connecting beam (9) form a permanent and temporary combined reinforcement system for the reinforcement of the existing foundation (2); the permanent and temporary combined reinforcement system temporarily fixes the main body of the foundation (2) before the grouting reinforcement of the foundation (2) base. The permanent and temporary combined reinforcement system also serves as part of the reinforcement of the main body of the foundation (2), forming a permanent shallow reinforcement, which complements the deep grouting reinforcement of the base to form a reinforced whole.

4. A construction method for a prefabricated reinforcement system combining permanent and temporary reinforcement for the foundation surrounding existing building columns, characterized in that, Includes the following steps: Step 1: Installation of the arc-shaped steel pipe (4); At the set positioning point, the arc-shaped steel pipe (4) is installed around the foundation (2) by means of pressure sinking or trenching, ensuring that the arc-shaped steel pipe (4) is tightly attached to the main body of the foundation (2); Step 2: Grouting at the bottom of the arc-shaped steel pipe (4) to form a solidified body (7); Grouting is performed on the bottom of the pipe and the surrounding soil through the pre-set through hole (5) on the arc-shaped steel pipe (4). The grout solidifies at the far end of the bottom of the arc-shaped steel pipe (4) to form a solidified body (7). The ribs (6) at the bottom of the arc-shaped steel pipe (4) are tightly wrapped and combined by the solidified body (7) to form an integral anchoring structure. Step 3: Install the transverse connecting beam (29) and the micro steel pipe (8); Install the transverse connecting beam (29) between the adjacent arc-shaped steel pipes (4), and drive the micro steel pipe (8) into the deeper soil through the reserved holes on the transverse connecting beam (29). Install the connecting beam (9) on the top of the micro steel pipe (8). The arc-shaped steel pipe (4), the solid body (7), the transverse connecting beam (29), the micro steel pipe (8) and the connecting beam (9) together form a permanent and temporary combined reinforcement system. Step 4: Install the connecting parts of the temporary pressurization and stabilization device; install the plug (10) and the connecting cylinder (11) in sequence on the top of the arc-shaped steel pipe (4), connect the telescopic rod (12) through the connecting cylinder (11), and install the top beam (13) on the top of the telescopic rod (12). The telescopic rod (12) provides elastic buffer space for subsequent pressurization. Step 5: Positioning of the mobile trolley (14) and adjustment of the arc support (16); Move the mobile trolley (14) to the ground (3) of the construction area, operate the mobile trolley (14) so ​​that the two arc supports (16) on its support frame (15) surround the two sides of the column (1), and adjust the two arc supports (16) to move and open, change their cross angle, so that they reach a suitable support position in the state of embracing the column (1). During this adjustment process, the sliding rod (19) of the support frame (15) slides around the movable axis (21) in the sliding stroke space (20) of the arc support (16); Step Six: Align the pressure plate (25) and apply temporary pressure; Adjust the arc-shaped support (16) so that the pressure plate (25) connected to the hydraulic rod (22) at its end is precisely matched and aligned with the top beam (13) at the top of the permanent and temporary combined reinforcement system. Start the hydraulic rod (22) to drive the crossbeam (23), pressure block (24) and pressure plate (25) to move downward, and apply stable pressure to the top beam (13). This pressure is transmitted to the arc-shaped steel pipe (4) through the top beam (13), telescopic rod (12), connecting cylinder (11) and plug-in (10), and then to the permanent and temporary combined reinforcement system below. Step 7: Base grouting to form a base reinforcement zone (28); Under the condition that the temporary pressure stabilizing device maintains the downward pressure on the permanent and temporary combined reinforcement system, high-pressure grouting is carried out by driving grouting pipe (27) to a predetermined depth at the bottom of the foundation (2). The grout diffuses, fills, replaces and consolidates in the soil, and finally forms the base reinforcement zone (28). During this grouting process, the upward buoyancy generated by the grouting and the downward pressure applied by the temporary pressure stabilizing device through the pressure plate (25) are kept in dynamic balance. Step 8: Transfer the temporary pressurization and stabilization device; after the foundation (2) of the current area is grouted and the grout is initially stabilized, operate the hydraulic rod (22) to release the pressure, and then control the two arc-shaped supports (16) to open outward and break away from the state of embracing the column (1), move the mobile trolley (14) out of the current construction area as a whole, and position it to the next construction area to be reinforced; Step 9: Remove temporary components and form permanent reinforcement; In the area where grouting reinforcement has been completed, remove the top beam (13), telescopic rod (12), connecting cylinder (11) and plug-in (10) in sequence. The permanent and temporary combined reinforcement system composed of the arc-shaped steel pipe (4), solid body (7), transverse connecting beam (29), micro steel pipe (8) and connecting beam (9) will be permanently left in place as the shallow permanent reinforcement part of the main body of the foundation (2), which together with the base reinforcement area (28) formed by deep grouting forms a complete and complementary reinforcement whole.

5. The construction method of the prefabricated reinforcement system for the foundation of existing building columns as described in claim 4, characterized in that, After step nine, the construction process of steps four through nine can be repeated in the next reinforcement area.

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