A reinforcing device and construction method for a foundation of a historical building to be repaired

Abstract

The application discloses a kind of reinforcement device and construction method of historical building hall foundation to be repaired, including the temporary support device of setting in hall foundation inside and outside side wall and the multiple vertical steel pipe piles of being evenly arranged with both sides of original foundation, vertical steel pipe pile is provided with the newly added reinforcing bar and penetrates original foundation, the lower portion of newly added reinforcing bar is provided with newly added cushion layer, and the upper portion of newly added reinforcing bar is provided with new fixed pile pile cap, and reinforcing steel is arranged between new fixed pile pile cap and located in the inside and outside of original foundation;Wherein, temporary support device includes fender, fixed horizontal bar, temporary support screw rod;Soft pad structure is arranged on fender, and fender is fixedly installed on wall surface by the soft pad structure, and both ends of fixed horizontal bar are fixedly installed on fender, one end of temporary support screw rod is fixedly installed on fixed horizontal bar, and the other end is fixedly installed with temporary inclined bracing pier.In the premise of not destroying building original authenticity, hall foundation, wall body are reinforced and supported protection.

Description

Technical Field

[0001] This invention relates to the field of foundation reinforcement technology, and in particular to a reinforcement device and construction method for the foundation of a historical building to be repaired. Background Technology

[0002] Historical buildings, as witnesses to history and inheritors of culture, record the trajectory of the times. Due to their age and the effects of natural forces, and lack of timely maintenance, these buildings have suffered varying degrees of damage, both inside and out, including foundation settlement, tilting and cracking of walls, and displacement of roof beams. This not only affects their appearance but also their functionality, load-bearing capacity, and lifespan, posing safety hazards to users and potentially causing serious accidents resulting in injury or death. However, comprehensive and non-destructive restoration of the main hall of historical buildings, including strengthening the overall foundation structure, straightening tilted walls, and repairing damaged roofs, has been a persistent challenge for many years, lacking a satisfactory solution.

[0003] Because ancient buildings often have brick carvings, paintings, and plasterwork on their walls, and the walls themselves are protected objects, the demolition and reconstruction of ancient buildings requires the maximum protection of the original structure, as well as effective reinforcement, correction, and repair. This mainly involves comprehensive and non-destructive repair of the overall foundation structure of the main hall of historical buildings, the straightening of tilted walls, and the repair of damaged roof shapes. The process is very complex. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a reinforcement device and construction method for the foundation of a historical building's main hall that needs repair. Without compromising the authenticity of the building, the device supports and protects the foundation and walls, ensuring their stability. By installing a new reinforcement device on the old foundation, comprehensive reinforcement and protection are achieved from the base to the walls, enhancing the overall integrity and stability of the main hall while reinforcing the entire foundation structure. This resolves potential issues such as settlement, wall tilting, and cracking.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A reinforcement device for the foundation of a historical building to be repaired includes temporary support devices installed on the inner and outer walls of the foundation, and multiple vertical steel pipe piles evenly distributed on both sides of the original foundation. New steel bars are installed on the vertical steel pipe piles and the new steel bars penetrate the original foundation. A new cushion layer is installed below the new steel bars. A new fixed pile cap is installed above the new cushion layer and the new steel bars. Reinforcing steel bars are installed between the new fixed pile cap and on the inner and outer sides of the original foundation.

[0007] The temporary support device includes a wall panel, a fixed crossbar, and a temporary support screw. The wall panel is provided with a soft pad structure and is fixedly installed on the wall surface through the soft pad structure. Both ends of the fixed crossbar are fixedly installed on the wall panel through crossbar fixing brackets. One end of the temporary support screw is fixedly installed on the fixed crossbar, and the other end is fixedly installed with a temporary diagonal brace.

[0008] Preferably, the construction method of the temporary wall support device includes the following steps:

[0009] A1. Wall panel splicing: Select wall panels independently according to the wall width and height and the wall panel size. Connect the panels with bolts. When connecting, the mating holes of the two panels should be aligned and the bolts should be tightened with a wrench.

[0010] A2. Install wall mounting brackets: Take out the wall mounting brackets, first put the wall mounting brackets on the brick wall, then erect the wall panels of the inner and outer walls, and use bolts to connect the wall mounting brackets to the wall panels;

[0011] A3. Installing the wall panel through-wall anchor bolts: After the through-wall brackets and wall panels are installed, remove the through-wall anchor bolts and use a wrench to adjust and reinforce the wall panels hanging between the inner and outer walls through the connection holes between the wall panels;

[0012] A4. Fixing crossbars for connecting wall panels: After the wall panels are fixed, remove the fixing crossbars and connectors respectively; the size of the fixing crossbars should be selected according to the width between the wall panels, and then connect one end of the fixing crossbar with the connectors, and then fix it with bolts after the connection is completed;

[0013] A5. Install the fixing crossbars of the wall panel: After the fixing crossbars are connected, take out the crossbar fixing brackets, put the crossbars on the fixing crossbars with the crossbar fixing brackets, and align the hex bolts with the fixing holes on the side of the wall panel and install and fix them with hex screwdrivers.

[0014] A6. Install temporary support screws: After the wall panel is fixed as a whole, take out the temporary support screws, and then connect the clamp of the adjusting screw to the fixed crossbar; then, grasp the adjusting handle on the fixed rotating rod by hand, and make the temporary support screws firmly and fastened to the temporary diagonal brace by rotating the fixed rotating rod, thus completing the overall temporary support.

[0015] Preferably, the exposed size of the temporary inclined support pier should be no less than 100mm × 100mm, and the depth should be no less than 500mm.

[0016] Preferably, the vertical steel pipe pile has a steel pipe inside, and the inside and outside of the steel pipe are filled with plain cement grout, with the water-cement ratio controlled between 0.4 and 0.6.

[0017] Preferably, the vertical steel pipe pile penetrates at least 2m into the strongly weathered siltstone, and its length is approximately 25m.

[0018] Preferably, a pile head dowel bar that intersects with the newly added reinforcing bar is provided between the vertical steel pipe pile and the new fixed pile cap.

[0019] Preferably, the joints of the vertical steel pipe piles are joined by sleeve lap welding.

[0020] Preferably, the sleeve height is not less than 300mm, and the sleeve wall thickness is not less than the wall thickness of the vertical steel pipe pile.

[0021] A construction method for a reinforcement device for the foundation of a historical building's main hall to be repaired, based on the aforementioned reinforcement device for the foundation of a historical building's main hall to be repaired, includes the following steps:

[0022] S1. Conduct geological exploration before construction;

[0023] S2. Temporary support devices for the inner and outer walls of the main hall foundation;

[0024] S3. After the temporary support device is installed, the vertical steel pipe piles are laid out and positioned to determine the location of the opening;

[0025] S4. A steel pipe with a diameter of about 40mm is drilled in a circular hole above the bedrock. The holes are arranged in a staggered pattern at an altitude of about 0.7m. Then, vertical steel pipe piles are installed, with the vertical steel pipe piles driven into the new fixed pile cap by 150mm. Pile head reinforcement bars are installed between the vertical steel pipe piles and the new fixed pile cap. The newly added reinforcement bars intersect with the pile head reinforcement bars and penetrate the original foundation. Reinforcing reinforcement bars are installed on the inner and outer sides of the original foundation and welded to the reinforcement bars of the new fixed pile cap to form a reinforcement template. Then, concrete is poured.

[0026] The beneficial effects of this invention are as follows: By using wall panels, fixed crossbars, temporary support bolts, and other structures, the walls of the main hall are supported and protected without compromising the original architectural integrity, ensuring the stability of the walls and further enhancing their robustness. This provides a solid foundation for the subsequent installation of reinforcement devices for the main hall wall base. Subsequently, by using micro steel pipe piles and new fixed pile caps, new reinforcement devices are installed on the old foundation, achieving simultaneous upper and lower reinforcement and support protection. Combined with the reinforcement of the main hall walls, a complete support system is formed, achieving comprehensive reinforcement and protection from the base to the walls. This enhances the overall integrity and stability of the building while reinforcing the overall foundation structure of the main hall, thereby resolving the potential risks of main hall settlement, wall tilting, and cracking. Attached Figure Description

[0027] Figure 1 A perspective view of the main hall of a historical building awaiting renovation;

[0028] Figure 2 A micro-pillar plan of the main hall of the historical building to be repaired;

[0029] Figure 3 Structural diagram showing the temporary support completed for the main hall of the historical building awaiting renovation;

[0030] Figure 4 for Figure 3 A magnified view of a portion of A-1;

[0031] Figure 5 This is a structural diagram of the wall panel;

[0032] Figure 6 This is a side view of the wall panel;

[0033] Figure 7 This is a structural diagram of a through-wall anchor bolt.

[0034] Figure 8 This is a structural diagram of a temporary support screw;

[0035] Figure 9 This is a structural diagram of a vertical steel pipe pile;

[0036] Figure 10 This is a structural diagram showing the connection between a vertical steel pipe pile and a steel pipe sleeve.

[0037] Figure 11 Construction drawings for the vertical steel pipe piles of the main hall of the historical building to be renovated;

[0038] Figure 12 Construction drawings for the new fixed pile foundation of the main hall of the historical building to be renovated;

[0039] Figure 13 This is a plan view of the new fixed pile cap;

[0040] Figure 14 Elevation view of the vertical steel pipe piles and the new fixed pile cap;

[0041] Figure 15 A perspective view showing the reinforcement of steel bars on the old foundation of the main hall.

[0042] Figure 16 A perspective view showing the reinforcement of the main hall's foundation;

[0043] Figure 17 This is a flowchart of the construction process for creating a hole.

[0044] The markings in the diagram are as follows: 1. Wall panel; 101. Soft pad structure; 2. Temporary support bolt; 3. Diagonal brace; 4. Fixed crossbar; 5. Through-wall anchor bolt; 6. Through-wall bracket; 7. Joint; 8. Vertical steel pipe pile; 9. Original foundation; 10. New cushion layer; 11. New reinforcement; 12. Pile head reinforcement; 13. New fixed pile cap; 14. Reinforcing steel. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the content of this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this invention and not for limiting it. Furthermore, it should be noted that, for ease of description, the accompanying drawings only show the parts relevant to this invention and not all of them. It should be noted that the main steel used in this invention is Q235-B, and the mechanical properties and chemical composition requirements meet the requirements of the current national standards <<Carbon Structural Steel>> (GB / T700) and <<Low Alloy High Strength Structural Steel>> (GB / T1591), ensuring that the steel's tensile strength, yield point, elongation, cold bending test, impact toughness are qualified, and the carbon, phosphorus, and sulfur content meet the limits.

[0046] like Figures 1 to 17 As shown, the present invention provides a reinforcement device for the foundation of a historical building to be repaired, including a temporary support device installed on the inner and outer walls of the foundation, and multiple vertical steel pipe piles 8 evenly distributed on both sides of the original foundation. New steel bars 11 are installed on the vertical steel pipe piles 8 and the new steel bars 11 penetrate the original foundation 9. A new cushion layer 10 is installed below the new steel bars 11. A new fixed pile cap 13 is installed above the new cushion layer 10 and the new steel bars 11. The vertical steel pipe piles 8 are driven into the new fixed pile cap 13. Reinforcing steel bars 14 are respectively installed between the new fixed pile caps 13 and on the inner and outer sides of the original foundation 9.

[0047] The temporary support device includes a wall panel 1, a fixed crossbar 4, and a temporary support screw 2. A soft pad structure 101 is provided on the wall panel, and the wall panel 1 is fixedly installed on the wall surface through the soft pad structure 101. Both ends of the fixed crossbar 4 are fixedly installed on the wall panel 1 through crossbar fixing brackets. One end of the temporary support screw 2 is fixedly installed on the fixed crossbar 4, and the other end is fixedly installed with a temporary diagonal brace 3.

[0048] First, the wall panel 1 has soft contact with the wall surface, protecting it from friction and impact from external objects and effectively reducing damage to the exterior wall finish. Then, through structures such as fixed crossbars 4 and temporary support bolts 2, the main hall wall is supported and reinforced, further enhancing its stability. This not only provides a solid foundation for the subsequent reinforcement of the main hall wall base but also effectively avoids problems such as deformation, settlement, and tilting that may occur during base reinforcement. Subsequently, vertical steel pipe piles 8 and new fixed pile caps 13 are used, with new reinforcement devices installed on the old foundation, achieving simultaneous upper and lower reinforcement and support protection. Combined with the support and reinforcement protection of the main hall wall, a complete support system is formed, achieving comprehensive reinforcement and protection from the base to the wall. This enhances the integrity and stability of the building while reinforcing the overall foundation structure of the main hall, effectively solving potential problems such as settlement, wall tilting, and cracking, and providing a safer and more stable structural environment for the main hall.

[0049] Furthermore, the construction method for the temporary wall support device includes the following steps:

[0050] A1. Splicing of wall panel 1: Select wall panels 1 independently according to the width and height of the wall and the size of the wall panel 1. Connect the panels with bolts. When connecting, the mating holes of the two panels should be aligned and the bolts should be tightened with a wrench.

[0051] A2. Install wall mounting bracket 6: Take out wall mounting bracket 6, first put wall mounting bracket 6 on the brick wall, then erect the inner and outer wall panels 1, and use bolts to connect wall mounting bracket 6 to wall panels 1.

[0052] A3. Install the through-wall anchor bolt 5 for wall panel 1: After the through-wall bracket 6 and wall panel 1 are installed, remove the through-wall anchor bolt 5, and use a wrench to adjust and reinforce the wall panel 1 hanging between the inner and outer walls through the connection hole between the wall panels 1.

[0053] A4. Fixing crossbar 4 connecting wall panel 1: After wall panel 1 is fixed, remove the fixing crossbar 4 and connector respectively; the size of the fixing crossbar should be selected according to the width between the wall panels, and then connect one end of the fixing crossbar 4 with the connector of the crossbar, and fix it with bolts after the connection is completed.

[0054] A5. Install the fixing crossbar 4 of the wall panel 1: After the fixing crossbar 4 is connected, take out the crossbar fixing bracket, put the crossbar fixing bracket on the fixing crossbar 4, and at the same time align the hex bolt with the fixing bracket and the fixing hole on the side of the wall panel 1, and install and fix it with a hex screwdriver.

[0055] A6. Install temporary support screw 2: After the wall panel 1 is fixed as a whole, take out the temporary support screw 2, and then connect the clamp of the adjusting screw to the fixed crossbar 4; then, grasp the adjusting handle on the fixed rotating rod by hand, and make the temporary support screw and the temporary diagonal brace 3 firmly fastened by the rotation of the fixed rotating rod, thus completing the overall temporary support.

[0056] The structure, including wall panel 1, wall bracket 6, wall anchor bolt 5, fixed crossbar 4, and temporary support bolt 2, supports and reinforces the walls of the main hall without compromising the original appearance of the building. This ensures the stability of the walls, improves their stability and load-bearing capacity, and provides a solid foundation for the installation of new reinforcement devices on the old foundation. It also effectively avoids potential problems such as deformation, settlement, and tilting of the walls.

[0057] Furthermore, the exposed size of the temporary inclined support pier 3 should be no less than 100mm × 100mm. This exposed size provides sufficient support area, ensuring stable contact between the temporary inclined support pier 3 and the ground or other structures, and preventing slippage or overturning. The depth should be no less than 500mm, allowing the temporary inclined support pier 3 to penetrate deep into the soil or foundation structure. This gives it a stronger load-bearing capacity, effectively resisting external forces and loads, enhancing structural stability, and thus strengthening its load-bearing capacity. This provides a solid foundation for the subsequent installation of reinforcement devices for the hall wall base, effectively preventing potential deformation, settlement, and tilting of the wall.

[0058] Furthermore, the vertical steel pipe pile 8 has a steel pipe inside, and the inside and outside of the steel pipe are filled with plain cement grout, with the water-cement ratio controlled between 0.4 and 0.6.

[0059] Furthermore, the vertical steel pipe pile 8 penetrates into the strongly weathered siltstone by no less than 2m, with a pile length of approximately 25m and a single pile bearing capacity characteristic value of 300KN.

[0060] Furthermore, pile head reinforcing bars 12, which intersect with the newly added reinforcing bars 11, are provided between the vertical steel pipe piles 8 and the new fixed pile cap 13. This effectively connects the vertical steel pipe piles 8 and the new fixed pile cap 13 into a whole, enhancing the integrity and stability of the structure. At the same time, it allows the vertical steel pipe piles 8 to better share the weight and load borne by the new fixed pile cap 13.

[0061] Furthermore, the joints 7 of the vertical steel pipe piles 8 are joined using sleeve lap welding. That is, a full-penetration butt weld is used between the steel pipes, with a weld thickness of 5mm. The connection between the steel pipes uses a sleeve joint method, requiring full welding around the joint, with a weld thickness of 5mm. At this point, the load-bearing capacity is greater, making the overall structure more stable.

[0062] Furthermore, the sleeve height is not less than 300mm, and the sleeve wall thickness is not less than 8 times the wall thickness of the vertical steel pipe pile, which can provide stronger vertical and lateral bearing capacity and enhance the overall stability of the structure.

[0063] A construction method for a reinforcement device for the foundation of a historical building's main hall to be repaired, based on the aforementioned reinforcement device for the foundation of a historical building's main hall to be repaired, includes the following steps:

[0064] S1. Conduct geological exploration before construction;

[0065] S2. Temporary support devices for the inner and outer walls of the main hall foundation;

[0066] S3. After the temporary support device is installed, the vertical steel pipe pile 8 is laid out and positioned to determine the location of the opening;

[0067] S4. A steel pipe with a diameter of about 40 mm is drilled in a circular hole above the bedrock. The holes are arranged in a staggered pattern at an altitude of about 0.7 m. Then, vertical steel pipe piles 8 are installed. The vertical steel pipe piles 8 are driven into the new fixed pile cap 13 by 150 mm. Pile head reinforcing bars 12 are set between the vertical steel pipe piles 8 and the new fixed pile cap 13. The newly added reinforcing bars 11 intersect with the pile head reinforcing bars 12 and penetrate the original foundation 9. Reinforcing bars 14 are set on the inner and outer sides of the original foundation 9 and welded to the reinforcing bars of the new fixed pile cap 13 to form a reinforcement template. Then, concrete is poured.

[0068] It is important to note that the pre-hole construction includes the following steps:

[0069] a. When drilling, use the overhead crane to hold the drill rod as much as possible, and drill slowly with light pressure to prevent excessive swing of the drill bit, which could cause over-diameter drilling or hole deviation. During drilling, constantly adjust the drive rod and ensure the base is level. If any unevenness is found, correct it immediately to ensure that the verticality is controlled to ≤0.3% of the pile length.

[0070] b. Control the water level in the hole during drilling. If there is serious leakage and water loss, replenish the grout in time to prevent the hole from collapsing.

[0071] c. Drilling is carried out using a skip-driving method, and drilling can only begin 24 hours after the adjacent piles have been completed.

[0072] d. Strictly control the mud parameters. When drilling in cohesive soil, the mud specific gravity should be controlled at 1.10 to 1.20; when drilling in sandy layers, the mud specific gravity should be controlled at 1.20 to 1.30.

[0073] e. If a deviation, collapse, or slurry leakage occurs during drilling, drilling should be stopped and resumed only after appropriate measures are taken.

[0074] f. The grouting should be carried out slowly to prevent pipe blockage. Before the hole is closed, the hole should be cleaned and the grout should be replaced to remove suspended sand particles from the hole.

[0075] Furthermore, the interface treatment for the micro-pillars in the main hall includes the following steps:

[0076] 1) In order to ensure that the new and old structures work together in a coordinated manner, the interface between the new and old concrete structures must be treated.

[0077] 2) Roughen the surface of the old concrete to a depth of about 10mm. For columns, the roughening depth should not exceed 10mm.

[0078] 3) After roughening, clean it with water and make it fully wet to ensure that the interface is moist when pouring concrete for the new structure.

[0079] 4) If any abnormalities such as cracks are found during the roughening process, inform the designer.

[0080] 5) Apply an interface treatment agent four hours before pouring the new structural concrete.

[0081] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A reinforcement device for the foundation of a hall in a historical building to be repaired, characterized in that, The system includes temporary support devices installed on the inner and outer walls of the main hall foundation, and multiple vertical steel pipe piles evenly distributed on both sides of the original foundation. New reinforcing bars are installed on the vertical steel pipe piles, penetrating the original foundation. A new cushion layer is installed below the new reinforcing bars, and a new fixed pile cap is installed above the new cushion layer and the new reinforcing bars. Reinforcing bars are installed between the new fixed pile caps and on the inner and outer sides of the original foundation. The temporary support device includes a wall panel, a fixed crossbar, and temporary support screws. A soft pad structure is installed on the wall panel, and the wall panel is fixed to the wall surface through the soft pad structure. Both ends of the fixed crossbar are fixed to the wall panel through crossbar fixing brackets. One end of the temporary support screw is fixed to the fixed crossbar, and the other end is fixed to a temporary diagonal brace. The construction method of the temporary support device includes the following steps: A1. Wall panel splicing: Select wall panels independently according to the wall width and height and the wall panel size. Connect the panels with bolts. When connecting, the mating holes of the two panels should be aligned and the bolts should be tightened with a wrench. A2. Install wall mounting brackets: Take out the wall mounting brackets, first put the wall mounting brackets on the brick wall, then erect the wall panels of the inner and outer walls, and use bolts to connect the wall mounting brackets to the wall panels; A3. Installing the wall panel through-wall anchor bolts: After the through-wall brackets and wall panels are installed, remove the through-wall anchor bolts and use a wrench to adjust and reinforce the wall panels hanging between the inner and outer walls through the connection holes between the wall panels; A4. Fixing crossbars for connecting wall panels: After the wall panels are fixed, remove the fixing crossbars and connectors respectively; the size of the fixing crossbars should be selected according to the width between the wall panels, and then connect one end of the fixing crossbar with the connectors, and then fix it with bolts after the connection is completed; A5. Install the fixing crossbars of the wall panel: After the fixing crossbars are connected, take out the crossbar fixing brackets, put the crossbars on the fixing crossbars with the crossbar fixing brackets, and align the hex bolts with the fixing holes on the side of the wall panel and install and fix them with hex screwdrivers. A6. Install temporary support screws: After the wall panel is fixed as a whole, take out the temporary support screws, and then connect the clamp of the adjusting screw to the fixed crossbar; then, grasp the adjusting handle on the fixed rotating rod by hand, and make the temporary support screws firmly and fastened to the temporary diagonal brace by rotating the fixed rotating rod, thus completing the overall temporary support.

2. The reinforcement device for the foundation of the main hall of a historical building to be repaired according to claim 1, characterized in that: The exposed size of the temporary inclined support pier should be no less than 100mm × 100mm, and the depth should be no less than 500mm.

3. The reinforcement device for the foundation of the main hall of a historical building to be repaired according to claim 1, characterized in that: The vertical steel pipe pile contains a steel pipe, and plain cement grout is injected inside and outside the steel pipe, with the water-cement ratio controlled between 0.4 and 0.

6.

4. The reinforcement device for the foundation of the main hall of a historical building to be repaired according to claim 1, characterized in that: The vertical steel pipe piles penetrate at least 2 meters into the strongly weathered siltstone, and their length is 25 meters.

5. The reinforcement device for the foundation of the main hall of a historical building to be repaired according to claim 1, characterized in that: A pile head dowel bar that intersects with the newly added reinforcing bar is provided between the vertical steel pipe pile and the new fixed pile cap.

6. The reinforcement device for the foundation of the main hall of a historical building to be repaired according to claim 1, characterized in that: The vertical steel pipe piles are joined by sleeve lap welding.

7. The reinforcement device for the foundation of the main hall of a historical building to be repaired according to claim 6, characterized in that: The sleeve height is not less than 300mm, and the sleeve wall thickness is not less than the wall thickness of the vertical steel pipe pile.

8. A construction method for a reinforcement device for the foundation of a historical building's main hall to be repaired, based on the reinforcement device for the foundation of a historical building's main hall to be repaired as described in claim 1, characterized in that... The steps include the following: S1. Conduct geological exploration before construction; S2. Temporary support devices for the inner and outer walls of the main hall foundation; S3. After the temporary support device is installed, the vertical steel pipe piles are laid out and positioned to determine the location of the opening; S4. A steel pipe with a diameter of 40mm is drilled through a circular hole in the bedrock, with the holes spaced 0.7m apart in a staggered pattern in the vertical direction. Then, vertical steel pipe piles are installed, with the vertical steel pipe piles driven into the new fixed pile cap by 150mm. Pile head reinforcing bars are installed between the vertical steel pipe piles and the new fixed pile cap. The newly added reinforcing bars intersect with the pile head reinforcing bars and penetrate the original foundation. Reinforcing bars are installed on the inner and outer sides of the original foundation and welded to the reinforcing bars of the new fixed pile cap to form a reinforcement template. Then, concrete is poured.

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