A reinforcing method for foundation inclination of an outdoor newly-added elevator shaft of an old building

Abstract

The application provides a reinforcing method for foundation inclination of an outdoor newly-added elevator shaft of an old building, which comprises the following steps: setting an inclined support on one side outside the elevator shaft frame; excavating the ground around the elevator shaft frame; grouting and reinforcing the foundation; additionally setting a connecting foundation between the wall under the strip foundation and the shaft foundation wall; expanding the thickness of the wall around the elevator foundation and additionally setting an extended foundation; removing the connection between each floor and the elevator; additionally setting a steel bracket at the bottom of the elevator shaft frame; righting the elevator shaft frame, cutting the foundation to the design height; additionally setting a support steel beam at the top of the elevator foundation; removing the formwork after curing the grouting material to the design age; removing the jack, the steel beam, the steel bracket and the inclined support; fastening the column bolt and reinforcing and repairing the connection between the elevator and the original building. The reinforcing method can effectively solve the problem of foundation settlement of the outdoor elevator added later 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 inclined foundation of a newly added outdoor elevator shaft in an old building. Background Technology

[0002] Many older residential buildings in my country, constructed before the last century, lack elevators, making elevator installation a pressing need for many families and society. Improving the quality of existing living conditions is a basic requirement for residents, making elevator installation in existing buildings a key public concern for both the government and society. In recent years, numerous elevator installation projects have been implemented across the country. Foundation treatment is crucial in elevator pit construction in older buildings; the quality of the foundation construction directly affects the normal and safe operation of the elevator later on.

[0003] In numerous projects involving the addition of outdoor elevators to older residential buildings, the common practice is to construct a new reinforced concrete frame shaft for the elevator at a suitable location within the existing building, based on the actual site conditions, or to add a steel structure shaft to the exterior of the old building. However, due to site limitations and geological conditions, many projects place the elevator foundation on backfill soil. Backfill soil suffers from problems such as short settlement time, loose soil texture, and low density, making it difficult to meet the bearing capacity requirements of the foundation for the elevator. Furthermore, since the original building has been constructed for decades, the foundation settlement is largely complete, while the newly added elevator foundation will generate new settlement. Therefore, uneven settlement of the newly installed elevator foundation can easily cause the elevator to tilt. Current research rarely addresses the foundation and settlement issues of outdoor elevators, leading to widespread uneven settlement of elevator foundations in many projects. Uneven settlement of outdoor elevator foundations can cause the connection between the elevator frame and the original building structure to break, the elevator frame to deform severely, and even damage the stability of the original building structure, resulting in extremely serious and adverse consequences. With numerous outdoor elevator installation projects already completed across the country, there is an urgent need for a reinforcement method to address uneven settlement of outdoor elevator shaft foundations. This method would address the uneven settlement issues caused by factors such as unreasonable foundation design, non-standard construction processes, and insufficient consideration of geological conditions, thereby restoring the functionality and safety of the newly installed outdoor elevators and achieving safe, reliable, and economical reinforcement. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a method for reinforcing the tilted foundation of a newly added outdoor elevator shaft in an old building. This reinforcement method is safe and efficient, and does not require large-scale secondary renovation of the original building structure. It can effectively solve the problem of settlement of the foundation of the newly added outdoor elevator, and can 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 the newly added outdoor elevator.

[0005] To achieve the above objectives, the present invention provides a method for reinforcing the tilted foundation of a newly added outdoor elevator shaft in an old building, comprising the following steps:

[0006] Step 1: Install diagonal supports on one side of the elevator shaft frame;

[0007] Step 2: Excavate the ground around the elevator shaft frame;

[0008] Safely excavate the ground down to the foundation bottom to expose the existing strip foundations under the walls of the building and the foundation walls of the elevator shaft for reinforcement;

[0009] Step 3: Grouting reinforcement of the foundation;

[0010] The grout to be solidified is injected into the cracks and gaps in the foundation below the strip foundation and shaft foundation wall using a sleeve valve pipe to reinforce the foundation below the strip foundation and shaft foundation wall.

[0011] Step 4: Add connection foundation;

[0012] S41: Rebar is installed between the strip foundation under the wall and the shaft foundation wall. Multiple steel bars are evenly distributed in the area between the exposed strip foundation under the wall and the shaft foundation wall, with one end inserted into the interior of the strip foundation under the wall and the other end inserted into the interior of the shaft foundation wall.

[0013] S42: Set up formwork 1 on the outside of multiple steel bars 1, and then pour additional concrete 1 inside formwork 1. Use the poured additional concrete 1 and the inserted multiple steel bars 1 to form a connecting foundation for the strip foundation under the wall and the shaft foundation wall, and make the strip foundation under the wall and the shaft foundation wall form an integral structure; during this process, ensure that the top surface of the connecting foundation is a planar structure.

[0014] Step 5: Expand the foundation slab around the elevator foundation;

[0015] Reinforcing bars are installed around the perimeter of the original elevator shaft foundation slab. Multiple reinforcing bars are evenly arranged around the perimeter of the shaft foundation slab, with one end of each reinforcing bar inserted into the shaft foundation slab. A formwork is then erected on the outside of the reinforcing bars, and additional concrete is poured inside the formwork. The additional concrete and the inserted reinforcing bars are used to enlarge the bottom surface of the original elevator foundation.

[0016] Step Six: Increase the thickness of the walls around the elevator foundation and add an extension foundation;

[0017] S61: Reinforcing bars are installed around the perimeter of the elevator shaft foundation wall. Multiple reinforcing bars are inserted around the perimeter of each wall of the shaft foundation wall. A formwork is erected on the outside of the multiple reinforcing bars. Then, additional concrete is poured inside the formwork. The thickness of the shaft foundation wall is increased by using the poured additional concrete and the inserted multiple reinforcing bars, so that each wall of the shaft foundation wall forms a thickened foundation wall.

[0018] S62: On the other side of the elevator shaft foundation wall away from the strip foundation below, insert multiple steel bars evenly on the other side of the shaft foundation wall, with one end of each steel bar close to the shaft foundation wall inserted into the interior of the shaft foundation wall. Extend the other end of each steel bar a set distance away from the strip foundation below the wall. Then, support a formwork on the outside of the steel bars. Pour additional concrete into the formwork. Using the additional concrete and the inserted steel bars, an extended foundation is formed on the other side of the shaft foundation wall away from the strip foundation below the wall. During this process, ensure that the top surface of the extended foundation is a planar structure and that the height of the top of the extended foundation is flush with the top surface of the connecting foundation.

[0019] Step 7: Disconnect each floor from the elevator;

[0020] Remove the bolts connecting the elevator shaft frame to the shaft foundation wall, and disconnect the column anchor plates and anchor bolts to completely separate the elevator shaft frame from the shaft foundation wall. Remove the connections between each floor and the elevator to completely separate the original building structure from the elevator.

[0021] Step 8: Add steel brackets to the bottom of the elevator shaft frame;

[0022] Two sets of steel brackets are welded to opposite sides at the same height at the bottom of the elevator shaft frame. The two sets of steel brackets are located above the newly added concrete section one and the newly added concrete section three, respectively. Each set of steel brackets consists of multiple steel brackets.

[0023] Step 9: Straighten the elevator shaft frame and cut the foundation to the designed height;

[0024] S91: Two sets of jacks are installed below the two sets of steel brackets. The two sets of jacks are respectively installed on the top of the connecting foundation and the extension foundation. Two steel beams are inserted between the two sets of jacks and the two sets of steel brackets. The bottom elevator shaft frame is supported by the jacks and the steel beams.

[0025] S92: Use two sets of jacks to lift the two steel beams to raise the elevator shaft frame to the original design height. During this process, adjust the diagonal supports simultaneously to ensure that the elevator shaft frame does not tilt significantly during the lifting operation.

[0026] S93: By controlling the extension and retraction amplitude of different jack piston rods, the tilt state of the elevator shaft frame is finely adjusted until the elevator shaft frame is straightened. Then the shaft foundation wall is cut to the design height. During this process, the diagonal support is adjusted simultaneously to ensure the stability of the elevator shaft frame during the fine adjustment.

[0027] Step 10: Install supporting steel beams on top of the elevator foundation;

[0028] S101: A supporting steel beam of appropriate size is installed at the top of each wall of the shaft foundation wall, and anchor bars are welded on the upper side of each supporting steel beam;

[0029] S102: Weld the bottom of the supporting steel beam to the anchor plate in the shaft foundation wall, and weld the top of the supporting steel beam to the column base on the elevator shaft frame.

[0030] S103: Set up formwork five on the outside of each supporting steel beam, and pour grout inside formwork five. Use the poured grout and the added supporting steel beams to connect the elevator shaft frame to the shaft foundation wall.

[0031] Step 11: After curing the grout to the designed age, remove the formwork.

[0032] Step 12: Remove the jacks, dismantle the steel beams, steel brackets, and diagonal supports;

[0033] Step Thirteen: Tighten the column base bolts and reinforce and repair the connection between the elevator and the original building;

[0034] Tighten the bolts at the connection between the elevator shaft frame and the supporting steel beam, and reinforce and repair the connection between the original building structure and the elevator.

[0035] Furthermore, to facilitate the subsequent jacking process, in step eight, ensure that the bottom height of the steel bracket meets the minimum height required for using jacks on the connecting foundation and the extension foundation.

[0036] Furthermore, in order to ensure that the elevator shaft frame can be restored to its original design height after being added back, in step ten, the height of the supporting steel beam is equal to the original settlement of the elevator foundation wall and the amount of cutting of the elevator foundation wall.

[0037] Furthermore, in order to effectively ensure the support strength, and thus to use the supporting steel beams to firmly connect the shaft foundation wall and the elevator shaft frame into an integral structure, the supporting steel beams are I-beams.

[0038] Furthermore, to ensure stability and safety during the jacking operation, in step eight, each group of steel brackets consists of three, located at both ends and the middle of one side of the elevator shaft frame. In step nine, the length of the steel beam matches the span of each group of steel brackets, and each group of jacks consists of three, located at both ends and the middle of the corresponding steel beam.

[0039] In this invention, before the reinforcement work begins, diagonal supports are erected on one side of the elevator shaft frame. This effectively prevents the elevator shaft frame from tilting during the reinforcement of the shaft foundation wall and the shaft foundation slab, ensuring a high safety factor during the operation. Grouting is performed using sleeve valves to fill cracks and gaps in the strip foundation under the wall and the foundation below the shaft foundation wall. This effectively reinforces the base slab of the shaft foundation wall and initially increases its area, thereby improving the foundation's resistance to settlement during later use and enhancing its bearing capacity. A connecting foundation formed by multiple reinforcing bars and newly poured concrete connects the strip foundation under the wall and the shaft foundation wall to form an integral structure. This utilizes the existing building foundation to effectively reinforce the shaft foundation wall, significantly increasing the foundation area of ​​the overall structure and further improving its resistance to settlement and bearing capacity. This effectively reduces the probability of further settlement of the shaft foundation wall during subsequent use. By inserting multiple reinforcing bars (represented by "two") around the perimeter of the original elevator shaft foundation slab and pouring concrete around them, the load-bearing capacity and settlement resistance of the elevator foundation base are effectively improved by increasing the base area, thus ensuring the stability and reliability of the elevator foundation during subsequent use. Similarly, by inserting multiple reinforcing bars (represented by "four") around the perimeter of the shaft foundation walls and pouring additional concrete around them, the wall thickness of the shaft foundation is effectively increased. This thickening of the shaft foundation walls further enhances the load-bearing capacity and settlement resistance of the elevator foundation, thereby ensuring its stability and reliability during subsequent use. Multiple reinforcing bars are inserted into the exterior of the shaft foundation wall on the side away from the strip foundation below. Additional concrete is poured outside these reinforcing bars, forming an extended foundation on the side of the shaft foundation wall opposite the connecting foundation. This effectively extends the length of the electromagnetic foundation wall on the other side, increasing the cross-sectional area of ​​the shaft foundation wall and significantly improving its stability. This further enhances the shaft foundation wall's resistance to settlement and its load-bearing capacity. After completely separating the original building structure from the elevator, two sets of steel brackets are installed at the bottom of the elevator shaft frame, providing support points for subsequent lifting of the elevator shaft frame. A steel beam is installed below each set of steel brackets, and a set of jacks is installed below each steel beam. The two sets of jacks allow for convenient lifting of the two steel beams, thus stably lifting the elevator shaft frame. During the lifting and straightening process, the diagonal supports are adjusted simultaneously, effectively ensuring the safety of the entire lifting process.First, the top of the reinforced shaft foundation wall is cut. Then, a supporting steel beam is added between the elevator shaft frame and the shaft foundation wall, which have been raised to the original design height. This supporting steel beam effectively compensates for the settlement of the foundation and the amount of cutting in the shaft foundation wall, ensuring that the elevator shaft frame can be restored to its original design height. The upper and lower ends of the supporting steel beam are welded to the column legs on the elevator shaft frame and the anchor plates in the shaft foundation wall, respectively. Grouting material is then poured onto the outside of the supporting steel beam. This grouting material and the added supporting steel beam stably connect the raised elevator shaft frame and the shaft foundation wall, ensuring that the overall connection has good load-bearing strength and anti-settlement capacity. After removing the auxiliary reinforcement equipment, the bolts at the connection between the elevator shaft frame and the supporting steel beam are tightened, and the connection between the original building structure and the elevator is reinforced and repaired, further enhancing the connection strength between the elevator shaft frame and the original building structure.

[0040] During the reinforcement process, this invention not only effectively increases the area of ​​the elevator shaft foundation wall base slab and establishes and strengthens the connection between the elevator shaft foundation wall and the strip foundation under the original building wall, but also effectively increases the width and extension range of the elevator shaft foundation wall, comprehensively improving its load-bearing capacity and settlement resistance. Simultaneously, after straightening the elevator shaft frame, supporting steel beams are added between the restored elevator shaft frame (to its original design height) and the neatly cut foundation wall, and grouting material is poured. This effectively ensures the stability and reliability of the raised elevator shaft frame, guaranteeing the elevator's functionality and safety after adjustment and restoration. This reinforcement method is simple in process, easy to implement, has a short cycle, quick results, and reliable reinforcement effect. It has little impact on the upper structure of the elevator shaft frame and does not require large-scale secondary renovation of the original building structure. It has a wide range of applications and effectively solves problems such as connection breakage of the original building structure, severe deformation of the elevator frame, and even damage to the stability of the original building structure caused by uneven settlement of the outdoor elevator foundation due to non-standard design, survey, and construction, which can lead to the tilting of the elevator shaft frame. It achieves a simple, efficient, and economical repair of the added outdoor elevator foundation and ensures the functionality and safety of the reinforced outdoor elevator shaft. Attached Figure Description

[0041] Figure 1 This is the foundation plan before reinforcement;

[0042] Figure 2 This is a floor plan of the reinforced foundation;

[0043] Figure 3 yes Figure 1 Sectional view along line AA;

[0044] Figure 4 yes Figure 2 BB-directed cross-section diagram;

[0045] Figure 5 This is a schematic diagram of the grouting plan for the elevator shaft foundation;

[0046] Figure 6 yes Figure 5 CC-direction cross-section;

[0047] Figure 7 This is a schematic diagram of the elevator shaft foundation wall and foundation slab;

[0048] Figure 8 This is a schematic diagram of the shaft frame lifting and support;

[0049] Figure 9 This is a schematic diagram of the steel beams at the bottom of the shaft frame and the grouting reinforcement.

[0050] In the diagram: 1. Elevator shaft frame, 2. Shaft foundation wall, 3. Strip foundation under the wall, 4. Steel bracket, 5. Jack, 6. Steel beam, 7. Diagonal brace, 8. Supporting steel beam, 9. Reinforcing bar 1, 10. Reinforcing bar 2, 11. Formwork 1, 12. Sleeve valve pipe, 13. Newly added concrete 1, 14. Grouting material, 15. Thickened foundation wall, 16. Shaft foundation slab, 17. Reinforcing bar 3, 18. Reinforcing bar 4, 19. Newly added concrete 2, 20. Newly added concrete 3. Detailed Implementation

[0051] The present invention will now be further described with reference to the accompanying drawings:

[0052] like Figures 1 to 9 As shown, this invention provides a method for reinforcing the tilted foundation of a newly added outdoor elevator shaft in an old building, comprising the following steps:

[0053] Step 1: Install diagonal bracing 7 on one side of the elevator shaft frame 1;

[0054] Step 2: Excavate the ground around the elevator shaft frame 1;

[0055] Safely excavate the ground to the bottom of the foundation to expose the strip foundation 3 under the existing building walls and the elevator shaft foundation wall 2 for reinforcement;

[0056] Step 3: Grouting reinforcement of the foundation;

[0057] Using sleeve valve pipe 12, the grout to be solidified is injected into the cracks and gaps in the foundation below the strip foundation 3 and the shaft foundation wall 2 to reinforce the foundation below the strip foundation 3 and the shaft foundation wall 2.

[0058] Step 4: Add connection foundation;

[0059] S41: Rebar is installed between the strip foundation 3 under the wall and the shaft foundation wall 2. Multiple steel bars 9 are evenly arranged in the area between the exposed strip foundation 3 under the wall and the shaft foundation wall 2, with one end inserted into the interior of the strip foundation 3 under the wall and the other end inserted into the interior of the shaft foundation wall 2.

[0060] S42: Set up formwork 11 on the outside of multiple reinforcing bars 9, and then pour additional concrete 13 inside formwork 11. Use the poured additional concrete 13 and the inserted multiple reinforcing bars 9 to form a connecting foundation for the strip foundation 3 under the wall and the shaft foundation wall 2, and make the strip foundation 3 under the wall and the shaft foundation wall 2 form an integral structure. During this process, ensure that the top surface of the connecting foundation is a planar structure.

[0061] Step 5: Expand the foundation slab around the elevator foundation;

[0062] Reinforcing bars are installed around the perimeter of the original elevator shaft foundation slab 16. Multiple reinforcing bars 2 10 are evenly arranged around the perimeter of the shaft foundation slab 16, and one end of the multiple reinforcing bars 2 10 is inserted into the shaft foundation slab 16. Then, formwork 2 is erected on the outside of the multiple reinforcing bars 2 10, and then additional concrete 2 19 is poured inside the formwork 2. The additional concrete 2 19 and the inserted multiple reinforcing bars 2 10 are used to enlarge the bottom surface of the original elevator foundation.

[0063] Step Six: Increase the thickness of the walls around the elevator foundation and add an extension foundation;

[0064] S61: Reinforcing bars are installed around the perimeter of the elevator shaft foundation wall 2. Multiple reinforcing bars 18 are inserted around the perimeter of each wall of the shaft foundation wall 2. A formwork 4 is erected on the outside of the multiple reinforcing bars 18. Then, additional concrete 4 is poured inside the formwork 4. The thickness of the shaft foundation wall 2 is increased by using the poured additional concrete 4 and the inserted multiple reinforcing bars 18, so that each wall of the shaft foundation wall 2 forms a thickened foundation wall 15.

[0065] S62: On the other side of the elevator shaft foundation wall 2 away from the strip foundation 3, reinforced bars are installed on the outside. Multiple reinforcing bars 317 are evenly arranged on the outside of the other side of the shaft foundation wall 2, and one end of the multiple reinforcing bars 317 close to the shaft foundation wall 2 is inserted into the shaft foundation wall 2. The other end of the multiple reinforcing bars 317 extends a set distance away from the strip foundation 3. Then, formwork 3 is erected on the outside of the multiple reinforcing bars 317. Then, additional concrete 320 is poured inside the formwork 3. Using the additional concrete 320 and the inserted multiple reinforcing bars 317, an extended foundation is formed on the other side of the shaft foundation wall 2 away from the strip foundation 3. During this process, it is ensured that the top surface of the extended foundation is a planar structure and that the height of the upper end of the extended foundation is flush with the top surface of the connecting foundation.

[0066] Step 7: Disconnect each floor from the elevator;

[0067] Remove the bolts connecting the elevator shaft frame 1 to the shaft foundation wall 2, and disconnect the column base anchor plates and anchor bolts to completely separate the elevator shaft frame 1 from the shaft foundation wall 2. Remove the connections between each floor and the elevator to completely separate the original building structure from the elevator.

[0068] Step 8: Add steel brackets 4 to the bottom of the elevator shaft frame 1;

[0069] Two sets of steel brackets 4 are welded to opposite sides at the same height at the bottom of the elevator shaft frame 1. The two sets of steel brackets 4 are located above the newly added concrete 13 and the newly added concrete 20, respectively. Each set of steel brackets 4 consists of multiple steel brackets 4.

[0070] Step 9: Straighten elevator shaft frame 1 and cut the foundation to the designed height;

[0071] S91: Two sets of jacks 5 are installed below the two sets of steel brackets 4. The two sets of jacks 5 are installed on the top of the connecting foundation and the extension foundation respectively. Two steel beams 6 are inserted between the two sets of jacks 5 and the two sets of steel brackets 4. The bottom elevator shaft frame 1 is supported by the jacks 5 and the steel beams 6.

[0072] S92: Use two sets of jacks 5 to lift the two steel beams 6 to raise the elevator shaft frame 1 to the original design height. During this process, adjust the diagonal support 7 simultaneously to ensure that the elevator shaft frame 1 will not tilt significantly during the lifting operation.

[0073] S93: By controlling the extension and retraction amplitude of the piston rods of different jacks 5, the tilt state of the elevator shaft frame 1 is finely adjusted until the elevator shaft frame 1 is straightened. Then the shaft foundation wall 2 is cut to the design height. During this process, the diagonal support 7 is adjusted simultaneously to ensure the stability of the elevator shaft frame 1 during the fine adjustment process.

[0074] Step 10: Add 8 supporting steel beams to the top of the elevator foundation;

[0075] S101: A supporting steel beam 8 of appropriate size is set on the top of each wall of the shaft foundation wall 2, and anchor bars are welded on the upper side of each supporting steel beam 8.

[0076] S102: Weld the bottom of the supporting steel beam 8 to the anchor plate in the shaft foundation wall 2, and weld the top of the supporting steel beam 8 to the column base on the elevator shaft frame 1.

[0077] S103: A template 5 is set up on the outside of each supporting steel beam 8, and grout 14 is poured into the template 5. The grout 14 and the added supporting steel beam 8 are used to connect the elevator shaft frame 1 and the shaft foundation wall 2.

[0078] Step 11: After curing the grout to the designed age, remove the formwork.

[0079] Step 12: Remove jack 5, dismantle steel beam 6, steel bracket 4 and diagonal support 7;

[0080] Step Thirteen: Tighten the column base bolts and reinforce and repair the connection between the elevator and the original building;

[0081] Tighten the bolts at the connection between the elevator shaft frame 1 and the supporting steel beam 8, and reinforce and repair the connection between the original building structure and the elevator.

[0082] To make the subsequent jacking process more convenient, in step eight, ensure that the bottom height of the steel bracket 4 meets the minimum height required for using the jack 5 on the connecting foundation and the extension foundation.

[0083] To ensure that the elevator shaft frame can be restored to its original design height after being added back, in step ten, the height of the supporting steel beam 8 is equal to the original settlement of the elevator shaft foundation wall 2 and the cutting amount of the elevator shaft foundation wall 2.

[0084] In order to effectively ensure the support strength, and thus use the supporting steel beams to firmly connect the shaft foundation wall and the elevator shaft frame into an integral structure, the supporting steel beam 8 is an I-beam.

[0085] To ensure stability and safety during the jacking operation, in step eight, each group of steel brackets 4 consists of three, located at both ends and the middle of one side of the elevator shaft frame. In step nine, the length of the steel beam 6 matches the span of each group of steel brackets 4, and each group of jacks 5 consists of three, located at both ends and the middle of the corresponding steel beam 6.

[0086] In this invention, before the reinforcement work begins, diagonal supports are erected on one side of the elevator shaft frame. This effectively prevents the elevator shaft frame from tilting during the reinforcement of the shaft foundation wall and the shaft foundation slab, ensuring a high safety factor during the operation. Grouting is performed using sleeve valves to fill cracks and gaps in the strip foundation under the wall and the foundation below the shaft foundation wall. This effectively reinforces the base slab of the shaft foundation wall and initially increases its area, thereby improving the foundation's resistance to settlement during later use and enhancing its bearing capacity. A connecting foundation formed by multiple reinforcing bars and newly poured concrete connects the strip foundation under the wall and the shaft foundation wall to form an integral structure. This utilizes the existing building foundation to effectively reinforce the shaft foundation wall, significantly increasing the foundation area of ​​the overall structure and further improving its resistance to settlement and bearing capacity. This effectively reduces the probability of further settlement of the shaft foundation wall during subsequent use. By inserting multiple reinforcing bars (represented by "two") around the perimeter of the original elevator shaft foundation slab and pouring concrete around them, the load-bearing capacity and settlement resistance of the elevator foundation base are effectively improved by increasing the base area, thus ensuring the stability and reliability of the elevator foundation during subsequent use. Similarly, by inserting multiple reinforcing bars (represented by "four") around the perimeter of the shaft foundation walls and pouring additional concrete around them, the wall thickness of the shaft foundation is effectively increased. This thickening of the shaft foundation walls further enhances the load-bearing capacity and settlement resistance of the elevator foundation, thereby ensuring its stability and reliability during subsequent use. Multiple reinforcing bars are inserted into the exterior of the shaft foundation wall on the side away from the strip foundation below. Additional concrete is poured outside these reinforcing bars, forming an extended foundation on the side of the shaft foundation wall opposite the connecting foundation. This effectively extends the length of the electromagnetic foundation wall on the other side, increasing the cross-sectional area of ​​the shaft foundation wall and significantly improving its stability. This further enhances the shaft foundation wall's resistance to settlement and its load-bearing capacity. After completely separating the original building structure from the elevator, two sets of steel brackets are installed at the bottom of the elevator shaft frame, providing support points for subsequent lifting of the elevator shaft frame. A steel beam is installed below each set of steel brackets, and a set of jacks is installed below each steel beam. The two sets of jacks allow for convenient lifting of the two steel beams, thus stably lifting the elevator shaft frame. During the lifting and straightening process, the diagonal supports are adjusted simultaneously, effectively ensuring the safety of the entire lifting process.First, the top of the reinforced shaft foundation wall is cut. Then, a supporting steel beam is added between the elevator shaft frame and the shaft foundation wall, which have been raised to the original design height. This supporting steel beam effectively compensates for the settlement of the foundation and the amount of cutting in the shaft foundation wall, ensuring that the elevator shaft frame can be restored to its original design height. The upper and lower ends of the supporting steel beam are welded to the column legs on the elevator shaft frame and the anchor plates in the shaft foundation wall, respectively. Grouting material is then poured onto the outside of the supporting steel beam. This grouting material and the added supporting steel beam stably connect the raised elevator shaft frame and the shaft foundation wall, ensuring that the overall connection has good load-bearing strength and anti-settlement capacity. After removing the auxiliary reinforcement equipment, the bolts at the connection between the elevator shaft frame and the supporting steel beam are tightened, and the connection between the original building structure and the elevator is reinforced and repaired, further enhancing the connection strength between the elevator shaft frame and the original building structure.

[0087] During the reinforcement process, this invention not only effectively increases the area of ​​the elevator shaft foundation wall base slab and establishes and strengthens the connection between the elevator shaft foundation wall and the strip foundation under the original building wall, but also effectively increases the width and extension range of the elevator shaft foundation wall, comprehensively improving its load-bearing capacity and settlement resistance. Simultaneously, after straightening the elevator shaft frame, supporting steel beams are added between the restored elevator shaft frame (to its original design height) and the neatly cut foundation wall, and grouting material is poured. This effectively ensures the stability and reliability of the raised elevator shaft frame, guaranteeing the elevator's functionality and safety after adjustment and restoration. This reinforcement method is simple in process, easy to implement, has a short cycle, quick results, and reliable reinforcement effect. It has little impact on the upper structure of the elevator shaft frame and does not require large-scale secondary renovation of the original building structure. It has a wide range of applications and effectively solves problems such as connection breakage of the original building structure, severe deformation of the elevator frame, and even damage to the stability of the original building structure caused by uneven settlement of the outdoor elevator foundation due to non-standard design, survey, and construction, which can lead to the tilting of the elevator shaft frame. It achieves a simple, efficient, and economical repair of the added outdoor elevator foundation and ensures the functionality and safety of the reinforced outdoor elevator shaft.

Claims

1. A method for reinforcing the tilted foundation of a newly added outdoor elevator shaft in an old building, characterized in that, Includes the following steps: Step 1: Install diagonal bracing (7) on one side of the elevator shaft frame (1); Step 2: Excavate the ground around the elevator shaft frame (1); Safely excavate the ground to the bottom of the foundation to expose the strip foundation (3) under the existing building walls and the elevator shaft foundation wall (2) for reinforcement; Step 3: Grouting reinforcement of the foundation; Using the sleeve valve pipe (12), the grout to be solidified is injected into the cracks and gaps in the foundation below the strip foundation (3) and the shaft foundation wall (2) to reinforce the foundation below the strip foundation (3) and the shaft foundation wall (2). Step 4: Add connection foundation; S41: Rebar is installed between the strip foundation (3) under the wall and the shaft foundation wall (2). Multiple steel bars (9) are evenly arranged in the area between the exposed strip foundation (3) under the wall and the shaft foundation wall (2), with one end inserted into the interior of the strip foundation (3) under the wall and the other end inserted into the interior of the shaft foundation wall (2). S42: Set up formwork (11) on the outside of multiple steel bars (9), and then pour new concrete (13) inside formwork (11). Use the poured new concrete (13) and the inserted steel bars (9) to form a connecting foundation for the strip foundation (3) under the wall and the shaft foundation wall (2), and make the strip foundation (3) under the wall and the shaft foundation wall (2) form an integral structure. During this process, ensure that the top surface of the connecting foundation is a planar structure. Step 5: Expand the foundation slab around the elevator foundation; Reinforcing bars are planted around the perimeter of the original elevator shaft foundation slab (16). Multiple reinforcing bars (10) are evenly arranged around the perimeter of the shaft foundation slab (16), and one end of the multiple reinforcing bars (10) close to the shaft foundation slab (16) is inserted into the shaft foundation slab (16). Then, formwork 2 is erected on the outside of the multiple reinforcing bars (10), and then additional concrete 2 (19) is poured inside the formwork 2. The additional concrete 2 (19) and the inserted multiple reinforcing bars (10) are used to enlarge the bottom surface of the original elevator foundation. Step Six: Increase the thickness of the walls around the elevator foundation and add an extension foundation; S61: Reinforcing bars are installed around the perimeter of the elevator shaft foundation wall (2). Multiple reinforcing bars (18) are inserted around the perimeter of each wall of the shaft foundation wall (2). A template (4) is erected on the outside of the multiple reinforcing bars (18). Then, additional concrete (4) is poured inside the template (4). The thickness of the shaft foundation wall (2) is increased by using the poured additional concrete (4) and the inserted multiple reinforcing bars (18), so that each wall of the shaft foundation wall (2) forms a thickened foundation wall (15). S62: On the other side of the elevator shaft foundation wall (2) away from the strip foundation (3) below the wall, insert steel bars (17) evenly on the other side of the shaft foundation wall (2), and insert one end of the steel bars (17) close to the shaft foundation wall (2) into the shaft foundation wall (2), and extend the other end of the steel bars (17) away from the strip foundation (3) by a set distance. Then, set up formwork (3) on the outside of the steel bars (17), and pour additional concrete (20) inside the formwork (3). Using the additional concrete (20) and the inserted steel bars (17), an extended foundation is formed on the other side of the shaft foundation wall (2) away from the strip foundation (3) below the wall. During this process, ensure that the top surface of the extended foundation is a planar structure and that the height of the upper end of the extended foundation is level with the top surface of the connecting foundation. Step 7: Disconnect each floor from the elevator; Remove the bolts connecting the elevator shaft frame (1) to the shaft foundation wall (2), and disconnect the column base anchor plate and anchor bolts to completely separate the elevator shaft frame (1) from the shaft foundation wall (2). Remove the connection between each floor and the elevator to completely separate the original building structure from the elevator. Step 8: Add steel brackets (4) to the bottom of the elevator shaft frame (1); Two sets of steel brackets (4) are welded on opposite sides of the bottom of the elevator shaft frame (1) at the same height. The two sets of steel brackets (4) are located above the newly added concrete section one (13) and the newly added concrete section three (20), respectively. Each set of steel brackets (4) consists of multiple steel brackets (4). Step 9: Straighten the elevator shaft frame (1) and cut the foundation to the designed height; S91: Two sets of jacks (5) are installed below the two sets of steel brackets (4). The two sets of jacks (5) are installed on the top of the connecting foundation and the extension foundation respectively. Two steel beams (6) are inserted between the two sets of jacks (5) and the two sets of steel brackets (4). The bottom elevator shaft frame (1) is supported by the jacks (5) and the steel beams (6). S92: Use two sets of jacks (5) to lift the two steel beams (6) to raise the elevator shaft frame (1) to the original design height. During this process, adjust the diagonal support (7) simultaneously to ensure that the elevator shaft frame (1) will not tilt significantly during the lifting operation. S93: By controlling the extension and retraction amplitude of the piston rods of different jacks (5), the tilt state of the elevator shaft frame (1) is finely adjusted until the elevator shaft frame (1) is straightened. Then the shaft foundation wall (2) is cut to the design height. During this process, the diagonal support (7) is adjusted simultaneously to ensure the stability of the elevator shaft frame (1) during the fine adjustment process. Step 10: Add a supporting steel beam (8) to the top of the elevator foundation; S101: A supporting steel beam (8) of appropriate size is set on the top of each wall of the shaft foundation wall (2), and anchor bars are welded on the upper side of each supporting steel beam (8); S102: Weld the bottom of the supporting steel beam (8) to the anchor plate in the shaft foundation wall (2), and weld the anchor bar at the top of the supporting steel beam (8) to the column foot on the elevator shaft frame (1). S103: Set up template five on the outside of each supporting steel beam (8) and pour grout (14) inside template five. Use the poured grout (14) and the added supporting steel beam (8) to connect the elevator shaft frame (1) with the shaft foundation wall (2). Step 11: After curing the grout (14) to the designed age, remove the formwork. Step 12: Remove the jack (5), dismantle the steel beam (6), steel bracket (4) and diagonal support (7); Step Thirteen: Tighten the column base bolts and reinforce and repair the connection between the elevator and the original building; Tighten the bolts at the connection between the elevator shaft frame (1) and the supporting steel beam (8), and reinforce and repair the connection between the original building structure and the elevator.

2. The method for reinforcing the inclined foundation of a newly added outdoor elevator shaft in an old building according to claim 1, characterized in that, In step eight, ensure that the bottom height of the steel bracket (4) meets the minimum height requirement for using jacks (5) on the connecting foundation and the extension foundation.

3. A method for reinforcing the inclined foundation of a newly added outdoor elevator shaft in an old building according to claim 1 or 2, characterized in that, In step ten, the height of the supporting steel beam (8) is equal to the original settlement of the elevator shaft foundation wall (2) and the cutting amount of the elevator shaft foundation wall (2).

4. The method for reinforcing the inclined foundation of a newly added outdoor elevator shaft in an old building according to claim 3, characterized in that, The supporting steel beam (8) is an I-beam.

5. A method for reinforcing the inclined foundation of a newly added outdoor elevator shaft in an old building according to claim 4, characterized in that, In step eight, there are three steel brackets (4) in each group, located at both ends and the middle of one side of the elevator shaft frame. In step nine, the length of the steel beam (6) matches the span of each group of steel brackets (4), and there are three jacks (5) in each group, located at both ends and the middle of the corresponding steel beam (6).

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