Reinforcing method for foundation settlement of outdoor elevator added to multistory building

Abstract

A reinforcing method for foundation settlement of a multi-storey building added with an outdoor elevator, which comprises the following steps: setting up inclined supports outside the elevator shaft frame and making the elevator shaft frame separate from the elevator foundation; removing the live load and the connection between the original building structure and the elevator; excavating the ground to the bottom surface of the foundation; grouting the strip foundation and the ground under the elevator foundation; connecting the elevator foundation and the strip foundation to form an integral structure; increasing the area of the bottom plate of the elevator foundation; additionally setting up steel corbels; lifting the elevator shaft frame by using a jack and a cross-shaped frame; additionally setting up a filling steel beam between the elevator foundation and the elevator shaft frame; fastening the column foot bolts and reinforcing and repairing the connection between the elevator and the original building; removing the jack and removing the cross-shaped frame, the steel corbels and the inclined supports. The reinforcing method has the advantages of simple process, easy implementation, short cycle, quick effect, reliable reinforcing effect, and can effectively solve the problem of foundation settlement of the added outdoor elevator and effectively ensure the use function and safety guarantee of the recovered outdoor elevator.

Description

Technical Field

[0001] This invention belongs to the field of building reinforcement technology, specifically relating to a reinforcement method for the foundation settlement of a multi-story building with an added outdoor elevator. Background Technology

[0002] In recent years, a large number of projects involving the installation of elevators in existing buildings have emerged across the country.

[0003] Many research projects on adding outdoor elevators to older residential buildings focus primarily on the structural problems of the elevator shaft frame itself or the connection between the elevator shaft frame and the original building structure, rarely addressing the foundation and settlement issues of the added elevators. This has led to widespread foundation settlement in these projects. Foundation settlement can cause the connection between the elevator shaft frame and the original building structure to break, the elevator shaft frame to deform severely, and even damage the stability of the original building structure, resulting in extremely serious consequences. Given the large number of outdoor elevator installation projects completed across the country, there is an urgent need for a reinforcement method for the foundation settlement of multi-story buildings with added outdoor elevators. This method should address foundation settlement issues caused by unreasonable foundation design, non-standard construction processes, and insufficient consideration of geological conditions, restoring the functionality and safety of the added outdoor elevators and achieving safe, efficient, and economical reinforcement. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a reinforcement method for the foundation settlement of a newly added outdoor elevator in a multi-story building. This reinforcement method is simple in process, easy to implement, has a short cycle, quick results, and reliable reinforcement effect. It can effectively solve the problem of foundation settlement of newly added outdoor elevators and effectively ensure the functionality and safety of the restored outdoor elevator. It can achieve a safe, efficient, and economical repair process for the foundation of newly added outdoor elevators.

[0005] To achieve the above objectives, the present invention provides a method for reinforcing the foundation settlement of a multi-story building with an added outdoor elevator, comprising the following steps:

[0006] Step 1: Detach the elevator shaft frame from the elevator foundation;

[0007] S11: Three diagonal supports are respectively installed on the three sides of the elevator shaft frame that are far away from the original floor structure;

[0008] S12: Remove the bolts connecting the elevator shaft frame to the elevator foundation, and disconnect the column anchor plates and anchor bolts to completely separate the elevator shaft frame from the elevator foundation.

[0009] Step 2: Remove the live load and disconnect the original building structure from the elevator;

[0010] Remove the live load of the added elevator and disconnect the original building from the elevator; if the original building and the added elevator are completely separated, only the elevator live load needs to be removed.

[0011] Step 3: Excavate the ground down to the foundation bottom;

[0012] A square foundation pit was dug around the elevator foundation to expose the strip foundation and elevator foundation under the wall of the original building on the side closest to the elevator, so as to facilitate subsequent reinforcement work.

[0013] Step 4: Grouting to reinforce the foundation beneath the strip foundation and elevator foundation;

[0014] Multiple holes were drilled evenly in the foundation under the original wall strip foundation and the foundation under the elevator foundation. The grout to be solidified was injected into the drilled holes using a sleeve valve pipe. The foundation under the original wall strip foundation and the foundation under the elevator foundation were reinforced by grouting.

[0015] Step 5: Connect the elevator foundation and strip foundation to form a complete structure;

[0016] S51: Arrange multiple steel bars evenly between the exposed bottom of the elevator foundation and the bottom of the strip foundation, and insert one end of the multiple steel bars into the interior of the strip foundation and the other end of the multiple steel bars into the interior of the elevator foundation. Use the multiple steel bars to fix the bottom of the elevator foundation and the bottom of the strip foundation.

[0017] S52: Set up formwork 1 on the outside of multiple reinforcing bars 1, and make the height of the interior space of formwork 1 equal to half the height of the exposed elevator foundation.

[0018] S53: Pour concrete into the interior of the erected formwork to form a connecting foundation, and use the connecting foundation to fix the lower part of the strip foundation and the lower part of the elevator foundation on opposite sides.

[0019] S54: Remove the formwork after the concrete to be poured has cured to the design age;

[0020] Step Six: Increase the area of ​​the elevator foundation slab;

[0021] S61: Multiple steel bars 2 are inserted on the outer perimeter of the three edges away from the strip foundation on the base plate of the elevator foundation. The ends of the multiple steel bars 2 away from the elevator foundation are extended outward by a set length. Then, formwork 2 is supported on the outside of the multiple steel bars 2, and the height of the internal space of formwork 2 is consistent with the height of the original base plate of the elevator foundation.

[0022] S62: Pour concrete into the interior of the erected formwork, using the poured concrete and the multiple embedded steel bars to extend the area of ​​the elevator foundation slab;

[0023] S63: Remove formwork 2 after the concrete to be poured has cured to the design age;

[0024] Step 7: Add steel brackets;

[0025] Four sets of steel brackets are welded on the four edges at the same height at the bottom of the elevator shaft frame. Each set of steel brackets consists of two steel brackets located on two adjacent sides of the same edge.

[0026] Step Nine: Lift the elevator shaft frame;

[0027] S91: Two sets of jacks are installed on the ground on the opposite sides of the square foundation pit. The line connecting the two sets of jacks is parallel to the strip foundation. Each set of jacks consists of two jacks distributed at both ends of the same side of the elevator shaft frame.

[0028] S92: A steel beam is arranged under the two steel brackets on each side of the elevator shaft frame, and the four steel beams are welded together to form a grid-shaped frame with dimensions that are compatible with the elevator shaft frame. The grid-shaped frame extends to the outside of the square pit at the two ends corresponding to the two sets of jacks, and is supported at the piston rod ends of the two jacks in the same set.

[0029] S93: Use two sets of jacks to lift the grid-shaped frame, raising the elevator shaft frame to the original design height, and ensuring that the tilt of the elevator shaft frame after restoring to the original design height is 0. During this process, adjust the diagonal support simultaneously to ensure that the elevator shaft frame does not tilt significantly during the lifting operation.

[0030] Step 10: Add infill steel beams;

[0031] S101: A matching steel beam of appropriate size is horizontally installed at the top of each wall of the elevator foundation, and anchor bars are welded to the upper side of each steel beam.

[0032] S102: Weld the bottom of the filling steel beam to the anchor plate in the elevator foundation, and weld the top of the filling steel beam to the column base on the elevator shaft frame.

[0033] S103: Set up formwork three on the outside of each infill steel beam, and pour grout inside the set up formwork three. Use the poured grout and the added infill steel beam to connect the elevator shaft frame to the elevator foundation.

[0034] S104: Remove formwork after curing the grout to the designed age;

[0035] Step 11: Tighten the column base bolts and reinforce the connection between the elevator and the original building;

[0036] Tighten the bolts at the connection between the elevator shaft frame and the infill steel beam, and reinforce and repair the connection between the original building structure and the elevator;

[0037] Step 12: Remove the jacks and dismantle the grid-shaped frame, steel brackets, and diagonal supports.

[0038] Furthermore, to make the subsequent jacking process more convenient, in step seven, ensure that the bottom height of the steel bracket meets the minimum height required for using jacks on outdoor ground.

[0039] Furthermore, in order to effectively ensure the support strength, the elevator foundation and the elevator shaft frame can be firmly connected into an integral structure using infill steel beams, wherein the infill steel beams are I-beams.

[0040] Furthermore, in order to effectively improve the stability and safety of the jacking operation, in step nine, a horizontal pad is fixedly connected to the lower end of the base of each jack and is supported on the ground by the horizontal pad. A support pad is installed at the end of the piston rod of each jack and is connected to the grid frame by the support pad.

[0041] As a preferred embodiment, in step five, the width of the connecting foundation is adapted to the width of the elevator foundation wall.

[0042] Furthermore, in order to effectively compensate for the height difference caused by the settlement of the foundation structure in the early stage, in step ten, the height of the filling steel beam is equal to the settlement of the elevator foundation.

[0043] In this invention, three diagonal supports are installed on three sides of the elevator shaft frame before the reinforcement work begins. This effectively prevents the elevator shaft frame from tilting during the separation process from the elevator foundation and the original building, ensuring a safety factor during the operation. Excavating a square foundation pit around the elevator foundation facilitates subsequent reinforcement work. Drilling is performed on the foundation first, followed by grouting of the strip foundation and the ground beneath the elevator foundation using a sleeve valve pipe. This effectively reinforces the bottom slab of the elevator foundation and initially increases its area, thereby effectively improving the foundation's resistance to settlement during later use and enhancing its bearing capacity to ensure the quality of the reinforcement project. By connecting the strip foundation and elevator foundation with multiple reinforcing bars and newly poured concrete to form an integral structure, the existing building foundation can be used to effectively reinforce the elevator foundation. This allows the original wall foundation and the original elevator foundation to work together, significantly increasing the foundation area of ​​the overall structure and further improving its settlement resistance and load-bearing capacity. This effectively reduces the probability of further settlement of the elevator foundation during subsequent use. Inserting multiple reinforcing bars around the perimeter of the elevator foundation slab and pouring concrete around them further increases the load-bearing capacity and settlement resistance of the elevator foundation base by expanding the slab area, thus ensuring the stability and reliability of the elevator foundation during subsequent use. Installing four sets of steel brackets at the bottom of the elevator shaft frame provides support points for subsequent jacking of the elevator shaft frame and ensures that the frame is not damaged during the jacking process. Each set of steel brackets consists of two steel brackets located on the outer sides of adjacent sides on the same edge. A grid-shaped frame is installed below the four sets of steel brackets. This grid-shaped frame stably supports the elevator shaft frame, significantly improving safety during the lifting process when the elevator shaft frame is lifted using two sets of jacks. Simultaneous adjustment of the diagonal supports during the lifting operation further ensures the overall safety of the lifting process. The grid-shaped frame extends to the outer side of the square pit at both ends corresponding to the two sets of jacks, facilitating jack placement on the ground and simplifying the installation of the lifting equipment. A filling steel beam is added between the elevator shaft frame and the elevator foundation after it has been raised to the original design height. This filler beam effectively compensates for ground settlement, ensuring that the reinforced elevator shaft frame can be restored to its original design height and maintaining its functionality. The upper and lower ends of the filling steel beam are welded to the column legs on the elevator shaft frame and the anchor plates in the elevator foundation, respectively. Grouting material is poured on the outside of the filling steel beam. The poured grouting material and the added filling steel beam can be used to stably connect the raised elevator shaft frame and the elevator foundation, and ensure that the whole after connection has good load-bearing strength and anti-settlement capacity.Tightening the bolts at the connection between the elevator shaft frame and the infill steel beam, and reinforcing and repairing the connection between the original building structure and the elevator, can further enhance the connection strength between the elevator shaft frame and the original building structure.

[0044] This invention, during the reinforcement process, not only effectively increases the area of ​​the elevator foundation slab but also establishes and strengthens the connection between the elevator foundation and the original building's strip foundation, thereby comprehensively improving the load-bearing capacity and settlement resistance of the elevator foundation. Simultaneously, by adding a filling steel beam and pouring grout between the elevator shaft frame (restored to its original design height) and the elevator foundation, the stability and reliability of the raised elevator shaft frame are effectively ensured, guaranteeing the functionality and safety of the restored elevator. This reinforcement method is safe, efficient, and does not require major secondary renovations to the original structure. It effectively solves the settlement problem of newly added outdoor elevator foundations caused by factors such as improper construction and unfavorable geological conditions, and effectively ensures the restoration of the functionality and safety of the newly added outdoor elevator, achieving a safe, efficient, and economical repair of newly added outdoor elevator foundations. Attached Figure Description

[0045] Figure 1 This is the foundation plan before reinforcement;

[0046] Figure 2 This is a floor plan of the reinforced foundation;

[0047] Figure 3 yes Figure 1 Sectional view along line AA;

[0048] Figure 4 yes Figure 1 BB-directed cross-section diagram;

[0049] Figure 5 This is a schematic diagram of the grouting plan for the elevator shaft foundation;

[0050] Figure 6 yes Figure 5 CC-direction cross-section;

[0051] Figure 7 This is a schematic diagram showing the enlargement of the elevator foundation slab;

[0052] Figure 8 This is a schematic diagram of the lifting support frame of the elevator shaft. Figure 1 ;

[0053] Figure 9 This is a schematic diagram of the lifting support frame of the elevator shaft. Figure 2 ;

[0054] Figure 10 This is a schematic diagram of the assembly of the grid-shaped frame and the elevator shaft frame;

[0055] Figure 11 This is an assembly diagram of the infill steel beam;

[0056] Figure 12 This is a schematic diagram of the grouting process.

[0057] In the diagram: 1. Elevator shaft frame, 2. Elevator foundation, 3. Strip foundation, 4. Steel bracket, 5. Jack, 6. Steel beam, 7. Diagonal brace, 8. Filler steel beam, 9. Reinforcing bar 1, 10. Reinforcing bar 2, 11. Formwork 1, 12. Sleeve valve pipe, 13. Connecting foundation, 14. Grouting material, 15. Square foundation pit, 16. Drilling hole, 17. Well-shaped frame. Detailed Implementation

[0058] The invention will now be further described with reference to the accompanying drawings:

[0059] like Figures 1 to 12 As shown, the present invention provides a method for reinforcing the foundation settlement of a multi-story building with an added outdoor elevator, comprising the following steps:

[0060] Step 1: Detach the elevator shaft frame 1 from the elevator foundation 2;

[0061] S11: Three diagonal supports 7 are respectively installed on the three sides of the elevator shaft frame 1 that are away from the original floor structure;

[0062] S12: Remove the bolts connecting the elevator shaft frame 1 and the elevator foundation 2, and disconnect the column anchor plates and anchor bolts to completely separate the elevator shaft frame 1 from the elevator foundation 2.

[0063] Step 2: Remove the live load and disconnect the original building structure from the elevator;

[0064] Remove the live load of the added elevator and disconnect the original building from the elevator; if the original building and the added elevator are completely separated, only the elevator live load needs to be removed.

[0065] Step 3: Excavate the ground down to the foundation bottom;

[0066] A square foundation pit 15 is dug around the elevator foundation 2 to expose the strip foundation 3 and the elevator foundation 2 under the wall of the original building on the side closest to the elevator, so as to facilitate subsequent reinforcement construction work.

[0067] Step 4: Grouting to reinforce the foundation beneath strip foundation 3 and elevator foundation 2;

[0068] Multiple boreholes 16 are drilled evenly in the foundation below the strip foundation 3 and elevator foundation 2 under the original wall. The grout to be solidified is injected into the drilled boreholes 16 using the sleeve valve pipe 12. The foundation below the strip foundation 3 and elevator foundation 2 under the original wall is reinforced by grouting.

[0069] Step 5: Connect elevator foundation 2 and strip foundation 3 to form an integral structure;

[0070] S51: Arrange multiple steel bars 9 evenly between the exposed bottom of the elevator foundation 2 and the bottom of the strip foundation 3, and insert one end of the multiple steel bars 9 into the interior of the strip foundation 3, and insert the other end of the multiple steel bars 9 into the interior of the elevator foundation 2, and use the multiple steel bars 9 to fix and connect the bottom of the elevator foundation 2 and the bottom of the strip foundation 3.

[0071] S52: Set up formwork 11 on the outside of multiple steel bars 9, and make the height of the interior space of formwork 11 equal to half the height of the exposed elevator foundation 2.

[0072] S53: Pour concrete into the supported formwork 11 to form a connecting foundation 13, and use the connecting foundation 13 to fix the lower part of the strip foundation 3 and the lower part of the elevator foundation 2 on opposite sides.

[0073] S54: Remove the formwork after the concrete to be poured has been cured to the design age - 11;

[0074] Step Six: Increase the area of ​​the elevator foundation 2 base plate;

[0075] S61: Multiple steel bars 2 10 are inserted on the outer perimeter of the three edges away from the strip foundation 3 on the bottom plate of elevator foundation 2, so that the ends of the multiple steel bars 2 10 away from elevator foundation 2 extend outward by a set length, and then formwork 2 is supported on the outside of the multiple steel bars 2 10, and the height of the internal space of formwork 2 is consistent with the height of the original bottom plate of elevator foundation 2.

[0076] S62: Pour concrete into the interior of the erected formwork, using the poured concrete and the multiple reinforcing bars 210 to extend the area of ​​the elevator foundation 2 base slab;

[0077] S63: Remove formwork 2 after the concrete to be poured has cured to the design age;

[0078] Step 7: Add 4 steel brackets;

[0079] Four sets of steel brackets 4 are welded on the four edges at the same height at the bottom of the elevator shaft frame 1. Each set of steel brackets 4 consists of two steel brackets 4 located on two adjacent sides of the same edge.

[0080] Step Nine: Lift the elevator shaft frame 1;

[0081] S91: Two sets of jacks 5 are erected on the ground outside the opposite sides of the square foundation pit 15. The line connecting the two sets of jacks 5 is parallel to the strip foundation 3. Each set of jacks 5 consists of two jacks 5 distributed at both ends of the same side of the elevator shaft frame 1.

[0082] S92: A steel beam 6 is arranged below the two steel brackets 4 on each side of the elevator shaft frame 1, and the four steel beams 6 are welded together to form a grid-shaped frame with dimensions that are compatible with the elevator shaft frame 1. The grid-shaped frame extends to the outside of the square pit 15 at the two ends corresponding to the two sets of jacks 5, and is supported at the piston rod ends of the two jacks 5 in the same set.

[0083] S93: Use two sets of jacks 5 to lift the grid-shaped frame, raise the elevator shaft frame 1 to the original design height, and ensure that the tilt of the elevator shaft frame 1 after restoring to the original design height is 0. During this process, adjust the inclined support 7 simultaneously to ensure that the elevator shaft frame 1 will not tilt significantly during the lifting operation.

[0084] Step 10: Add 8 infill steel beams;

[0085] S101: A matching steel beam 8 is horizontally installed at the top of each wall of the elevator foundation 2, and anchor bars are welded to the upper side of each steel beam 8.

[0086] S102: Weld the bottom of the filling steel beam 8 to the anchor plate in the elevator foundation 2, and weld the top anchor bar of the filling steel beam 8 to the column base on the elevator shaft frame 1.

[0087] S103: A template 3 is erected on the outside of each infill steel beam 8, and grout 14 is poured into the inside of the erected template 3. The elevator shaft frame 1 and the elevator foundation 2 are connected by the poured grout 14 and the added infill steel beam 8.

[0088] S104: After the grout has been cured for 14 days to the design age, remove the formwork.

[0089] Step 11: Tighten the column base bolts and reinforce the connection between the elevator and the original building;

[0090] Tighten the bolts at the connection between the elevator shaft frame 1 and the infill steel beam 8, and reinforce and repair the connection between the original building structure and the elevator;

[0091] Step 12: Remove jack 5, dismantle the grid frame, steel bracket 4, and diagonal support 7.

[0092] To make the subsequent lifting process more convenient, in step seven, ensure that the bottom height of the steel bracket 4 meets the minimum height required for using the jack 5 on an outdoor ground surface.

[0093] In order to effectively ensure the support strength, and thus use the filling steel beams to firmly connect the elevator foundation and the elevator shaft frame into an integral structure, the filling steel beams 8 are I-beams.

[0094] In order to effectively improve the stability and safety of the jacking operation, in step nine, a horizontal pad is fixedly connected to the lower end of the base of each jack 5 and is supported on the ground by the horizontal pad. A support pad is installed at the end of the piston rod of each jack 5 and is connected to the grid frame by the support pad.

[0095] As a preferred embodiment, in step five, the width of the connecting base 13 is adapted to the width of the wall of the elevator base 2.

[0096] In order to effectively compensate for the height difference caused by the settlement of the foundation structure in the early stage, in step ten, the height of the filling steel beam 8 is equal to the settlement of the elevator foundation 2.

[0097] In this invention, three diagonal supports are installed on three sides of the elevator shaft frame before the reinforcement work begins. This effectively prevents the elevator shaft frame from tilting during the separation process from the elevator foundation and the original building, ensuring a safety factor during the operation. Excavating a square foundation pit around the elevator foundation facilitates subsequent reinforcement work. Drilling is performed on the foundation first, followed by grouting of the strip foundation and the ground beneath the elevator foundation using a sleeve valve pipe. This effectively reinforces the bottom slab of the elevator foundation and initially increases its area, thereby effectively improving the foundation's resistance to settlement during later use and enhancing its bearing capacity to ensure the quality of the reinforcement project. By connecting the strip foundation and elevator foundation with multiple reinforcing bars and newly poured concrete to form an integral structure, the existing building foundation can be used to effectively reinforce the elevator foundation. This allows the original wall foundation and the original elevator foundation to work together, significantly increasing the foundation area of ​​the overall structure and further improving its settlement resistance and load-bearing capacity. This effectively reduces the probability of further settlement of the elevator foundation during subsequent use. Inserting multiple reinforcing bars around the perimeter of the elevator foundation slab and pouring concrete around them further increases the load-bearing capacity and settlement resistance of the elevator foundation base by expanding the slab area, thus ensuring the stability and reliability of the elevator foundation during subsequent use. Installing four sets of steel brackets at the bottom of the elevator shaft frame provides support points for subsequent jacking of the elevator shaft frame and ensures that the frame is not damaged during the jacking process. Each set of steel brackets consists of two steel brackets located on the outer sides of adjacent sides on the same edge. A grid-shaped frame is installed below the four sets of steel brackets. This grid-shaped frame stably supports the elevator shaft frame, significantly improving safety during the lifting process when the elevator shaft frame is lifted using two sets of jacks. Simultaneous adjustment of the diagonal supports during the lifting operation further ensures the overall safety of the lifting process. The grid-shaped frame extends to the outer side of the square pit at both ends corresponding to the two sets of jacks, facilitating jack placement on the ground and simplifying the installation of the lifting equipment. A filling steel beam is added between the elevator shaft frame and the elevator foundation after it has been raised to the original design height. This filler beam effectively compensates for ground settlement, ensuring that the reinforced elevator shaft frame can be restored to its original design height and maintaining its functionality. The upper and lower ends of the filling steel beam are welded to the column legs on the elevator shaft frame and the anchor plates in the elevator foundation, respectively. Grouting material is poured on the outside of the filling steel beam. The poured grouting material and the added filling steel beam can be used to stably connect the raised elevator shaft frame and the elevator foundation, and ensure that the whole after connection has good load-bearing strength and anti-settlement capacity.Tightening the bolts at the connection between the elevator shaft frame and the infill steel beam, and reinforcing and repairing the connection between the original building structure and the elevator, can further enhance the connection strength between the elevator shaft frame and the original building structure.

[0098] This invention, during the reinforcement process, not only effectively increases the area of ​​the elevator foundation slab but also establishes and strengthens the connection between the elevator foundation and the original building's strip foundation, thereby comprehensively improving the load-bearing capacity and settlement resistance of the elevator foundation. Simultaneously, by adding a filling steel beam and pouring grout between the elevator shaft frame (restored to its original design height) and the elevator foundation, the stability and reliability of the raised elevator shaft frame are effectively ensured, guaranteeing the functionality and safety of the restored elevator. This reinforcement method is safe, efficient, and does not require major secondary renovations to the original structure. It effectively solves the settlement problem of newly added outdoor elevator foundations caused by factors such as improper construction and unfavorable geological conditions, and effectively ensures the restoration of the functionality and safety of the newly added outdoor elevator, achieving a safe, efficient, and economical repair of newly added outdoor elevator foundations.

Claims

1. A method for reinforcing the foundation settlement of a multi-story building with an added outdoor elevator, characterized in that, Includes the following steps: Step 1: Detach the elevator shaft frame (1) from the elevator foundation (2); S11: Three diagonal supports (7) are respectively installed on the three sides of the elevator shaft frame (1) that are far away from the original floor structure; S12: Remove the bolts connecting the elevator shaft frame (1) and the elevator foundation (2), and disconnect the column anchor plate and the anchor bolts to completely separate the elevator shaft frame (1) from the elevator foundation (2). Step 2: Remove the live load and disconnect the original building structure from the elevator; Remove the live load of the added elevator and disconnect the original building from the elevator; if the original building and the added elevator are completely separated, only the elevator live load needs to be removed. Step 3: Excavate the ground down to the foundation bottom; A square foundation pit (15) is dug around the elevator foundation (2) to expose the strip foundation (3) and the elevator foundation (2) under the wall of the original building near the elevator, so as to facilitate subsequent reinforcement work. Step 4: Grouting to reinforce the foundation beneath the strip foundation (3) and elevator foundation (2); Multiple boreholes (16) are drilled evenly in the foundation below the strip foundation (3) and elevator foundation (2) under the original wall. The grout to be solidified is injected into the drilled boreholes (16) using a sleeve valve pipe (12). The foundation below the strip foundation (3) and elevator foundation (2) under the original wall is reinforced by grouting. Step 5: Connect the elevator foundation (2) and the strip foundation (3) to form an integral structure; S51: Arrange multiple steel bars (9) evenly between the bottom of the exposed elevator foundation (2) and the bottom of the strip foundation (3), and insert one end of the multiple steel bars (9) into the interior of the strip foundation (3) and insert the other end of the multiple steel bars (9) into the interior of the elevator foundation (2). Use the multiple steel bars (9) to fix the bottom of the elevator foundation (2) and the bottom of the strip foundation (3). S52: Set up formwork (11) on the outside of multiple steel bars (9) and make the height of the interior space of formwork (11) equal to half the height of the exposed elevator foundation (2); S53: Pour concrete into the interior of the erected template (11) to form a connecting foundation (13), and use the connecting foundation (13) to fix the lower part of the strip foundation (3) and the lower part of the elevator foundation (2) on opposite sides. S54: Remove the formwork after the concrete to be poured has been cured to the design age (11); Step Six: Increase the area of ​​the elevator foundation (2) base plate; S61: Multiple steel bars (10) are inserted on the outer perimeter of the three edges of the elevator foundation (2) away from the strip foundation (3), so that the ends of the multiple steel bars (10) away from the elevator foundation (2) extend outward by a set length, and then formwork (2) is set on the outside of the multiple steel bars (10), and the height of the interior space of formwork (2) is consistent with the height of the original base plate of the elevator foundation (2). S62: Pour concrete into the interior of the set template 2, and extend the area of ​​the elevator foundation (2) base plate by using the poured concrete and the multiple steel bars (10) inserted. S63: Remove formwork 2 after the concrete to be poured has cured to the design age; Step 7: Add steel brackets (4); Four sets of steel brackets (4) are welded on the four edges at the same height at the bottom of the elevator shaft frame (1). Each set of steel brackets (4) consists of two steel brackets (4) located on two adjacent sides of the same edge. Step 9: Lift the elevator shaft frame (1); S91: Two sets of jacks (5) are set up on the ground outside the opposite sides of the square foundation pit (15). The line connecting the two sets of jacks (5) is parallel to the strip foundation (3). Each set of jacks (5) consists of two jacks (5) distributed at both ends of the same side of the elevator shaft frame (1). S92: A steel beam (6) is arranged below the two steel brackets (4) on each side of the elevator shaft frame (1), and the four steel beams (6) are welded together to form a grid frame with dimensions that are compatible with the elevator shaft frame (1). The grid frame extends to the outside of the square pit (15) at the two ends corresponding to the two sets of jacks (5), and is supported at the piston rod ends of the two jacks (5) in the same set. S93: Use two sets of jacks (5) to lift the grid frame, raise the elevator shaft frame (1) to the original design height, and ensure that the tilt of the elevator shaft frame (1) restored to the original design height is 0. During this process, adjust the inclined support (7) simultaneously to ensure that the elevator shaft frame (1) will not tilt significantly during the lifting operation. Step 10: Add a filling steel beam (8); S101: A matching steel beam (8) is horizontally installed at the top of each wall of the elevator foundation (2), and anchor bars are welded on the upper side of each steel beam (8). S102: Weld the bottom of the filling steel beam (8) to the anchor plate in the elevator foundation (2) and weld the top of the filling steel beam (8) to the column base on the elevator shaft frame (1). S103: Set up template three on the outside of each filling steel beam (8), and pour grout (14) into the inside of the set template three. Use the poured grout (14) and the added filling steel beam (8) to connect the elevator shaft frame (1) with the elevator foundation (2). S104: After the grouting material (14) has been cured to the designed age, the formwork is removed. Step 11: Tighten the column base bolts and reinforce the connection between the elevator and the original building; Tighten the bolts at the connection between the elevator shaft frame (1) and the filling steel beam (8), and reinforce and repair the connection between the original building structure and the elevator; Step 12: Remove the jack (5), dismantle the grid frame, steel brackets (4), and diagonal supports (7).

2. The method for reinforcing the foundation settlement of a multi-story building with a subsequently added outdoor elevator, as described in claim 1, is characterized in that... In step seven, ensure that the bottom height of the steel bracket (4) meets the minimum height requirement for using the jack (5) on an outdoor ground surface.

3. A method for reinforcing the foundation settlement of a multi-story building with an added outdoor elevator according to claim 1, characterized in that, The filling steel beam (8) is an I-beam.

4. The method for reinforcing the foundation settlement of a multi-story building with an added outdoor elevator according to claim 3, characterized in that, In step nine, a horizontal pad is fixedly connected to the lower end of the base of each jack (5) and is supported on the ground by the horizontal pad. A support pad is installed at the end of the piston rod of each jack (5) and is connected to the grid frame by the support pad.

5. The method for reinforcing the foundation settlement of a multi-story building with an added outdoor elevator according to claim 4, characterized in that, In step five, the width of the connecting base (13) is adapted to the width of the elevator base (2) wall.

6. The method for reinforcing the foundation settlement of a multi-story building with a subsequently added outdoor elevator, as described in claim 5, is characterized in that... In step ten, the height of the filling steel beam (8) is equal to the settlement of the elevator foundation (2).

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