Existing building lifting and leveling structure

Abstract

The utility model belongs to an existing building lifting and leveling structure in the field of urban renewal construction. A foundation of the existing building is reinforced to form an integral tray structure, and loads of the existing building and the tray structure are transmitted to the anchor rod static pressure piles through structures such as the steel strands and the counter-force beams. On the basis, a lifting jack is arranged on the counter-force beam, and the steel strand is lifted through the lifting jack to drive the existing building to be lifted upwards. And the jacks can be controlled to be lifted by different heights through the oil pressure control system, so that the leveling of the existing building is realized. The single lifting stroke of the lifting jack is limited, and the lifting jack cannot be lifted in place at a time, so that one-way limiting devices are respectively arranged at the top and the bottom of the jack. And on the basis, the underground space can be developed and built below the existing building in cooperation with the foundation pit supporting technology, then the aim of improving the building function is achieved, and the method plays an important role in urban updating construction projects.

Description

Technical Field

[0001] This utility model belongs to the field of renovation and reconstruction of existing buildings in urban renewal, and particularly relates to a structure for the renovation of existing buildings in the central urban area combined with the development of their underground space. Background Technology

[0002] Early existing buildings in central urban areas often used shallow foundations such as brick masonry with large slabs. Due to their age, in soft soil areas like Shanghai, they have often accumulated significant settlement. If the superstructure load of the existing buildings is uneven or the soil strata are unevenly distributed, these existing buildings usually also have problems such as large differential settlement and overall tilting. These problems not only affect the safety of the existing buildings themselves, but also make the area lower than the surrounding newly built blocks, resulting in significant urban flooding during rainy weather. In urban renewal and renovation, there is often a need to upgrade and level existing buildings. At the same time, in the process of developing underground space beneath existing buildings, if the existing buildings cannot be moved, the primary problem to be solved is to replace the foundation of the existing buildings to ensure the safety of the building during the excavation of the soil beneath them. On this basis, appropriate upgrading of existing buildings to create certain construction space can greatly facilitate the underground space construction process.

[0003] Currently, the construction process for lifting and leveling existing buildings is quite complicated, and the construction equipment is relatively large. Furthermore, the lifting height is limited when the first floor of an existing building has a low ceiling and limited internal space. In large-scale underground space development beneath existing buildings, especially in situations with narrow ceilings and low clearance, the technology for lifting and leveling existing buildings is still immature. Utility Model Content

[0004] This invention provides a structure for lifting and leveling existing buildings, particularly suitable for developing underground space beneath older, shallow-foundation existing buildings in urban centers where construction sites are limited. This structure enables the overall lifting of existing buildings and addresses the issue of overall tilting. The equipment is lightweight and easy to operate, making it especially suitable for lifting existing buildings in confined spaces with low clearance.

[0005] A structure for lifting and leveling an existing building is disclosed. The existing building has a shallow foundation, which is widened and reinforced to form a tray structure that supports the existing building. Piling holes are installed on the tray structure; anchored static pressure piles are driven into the pile holes; a reaction beam is installed on top of the anchored static pressure piles; lifting jacks are installed on the reaction beam, and the lower ends of vertically installed steel strands are anchored to the tray structure; the upper ends of the steel strands pass through the reaction beam and connect to the lifting jacks, and each lifting jack is connected to a hydraulic control system via oil pipes.

[0006] Based on the above technical features: the lifting jack includes a plunger, a hydraulic cylinder, a steel outer shell, an upper limiting device, and a lower limiting device. The upper limiting device includes an upper limiting plate and an upper clamping plate. The upper clamping plate is a cone shape, wider at the top and narrower at the bottom, and can be inserted into or pulled out of the upper limiting plate. The lower limiting device includes a lower limiting plate and a lower clamping plate. The lower clamping plate is also a cone shape, wider at the top and narrower at the bottom, and can be inserted into or pulled out of the lower limiting plate. A lower cover plate is located above the lower limiting plate, and the lower cover plate restricts the lower clamping plate from detaching upward from the lower limiting plate. The steel strand passes through the lower clamping plate, the lower cover plate, the hydraulic cylinder, the plunger, and the upper clamping plate from bottom to top.

[0007] Based on the above technical features: vertical steel strands are pre-embedded in the pallet structure, with anchor ends at the bottom of the steel strands connected to the pallet structure, and connectors at the top of the pre-embedded steel strands. The steel strands are extended through the connectors and connected to the lifting jack.

[0008] Based on the above technical features: pre-drilled holes on the reaction beam through which steel strands pass.

[0009] The concept behind the above technical solution is as follows: For existing buildings with shallow foundations, the building load is mainly borne by the foundation soil at the bottom. After lifting, the existing building will be separated from the foundation soil, so the first issue to address is the load-bearing capacity of the lifted building. The foundation of the existing building is reinforced to form an integral tray structure. Through steel strands, reaction beams, and other structures, the load of the existing building and the tray structure is transferred to the anchor static pressure piles, completing the first load transfer. On this basis, lifting jacks are installed on the reaction beams. The lifting system consists of multiple sets of jacks, and the lifting height of each jack can be controlled by a hydraulic control system to achieve leveling of the existing building.

[0010] The lifting jack has a limited lifting stroke, typically around 10cm per lift, which cannot be lifted into place in one go. Therefore, a one-way upper limit device and a lower limit device are installed at the top and bottom of the lifting jack, respectively.

[0011] When the lifting jack is in the pressurized lifting state, it pulls the steel strand upward through the lower and upper limiting devices, thereby lifting the building upward. When the jack is in the depressurized retracted state, the lower and upper limiting devices lock the steel strand, preventing downward displacement and ensuring the building does not fall back. At this time, the plunger at the top of the jack is no longer under force, and the load of the existing building is directly transferred through the steel strand to the lower limiting device at the bottom, and then to the anchor piles. This process is repeated until the existing building is lifted to the predetermined height. Based on this, the basement structure can be excavated and constructed using foundation pit support technology. After the basement roof slab is completed, the lower clamp of the lower limiting device can be removed, and the lifting jack can be used to lower the building back onto the roof slab. The load of the existing building is ultimately transferred through the basement roof slab to the main structural pile foundation. At this point, the entire lifting device can be dismantled, and the remaining basement structure can be completed.

[0012] This invention utilizes a building lifting method for developing underground space beneath existing buildings. This method enables the overall lifting of existing buildings and addresses the issue of building tilt. Combined with foundation pit support technology, it allows for the development and construction of underground space beneath existing buildings, thereby achieving the goal of enhancing building functionality. This approach plays a crucial role in urban renewal projects.

[0013] Furthermore, lifting devices are typically installed on the first floor of existing buildings, where the floor height and floor area are limited. Current construction techniques are relatively complex, and the equipment is relatively large. In existing buildings with low floor heights and limited internal space, the lifting height is also limited. The lifting device used in this invention is easy to operate, lightweight, and simple to use, making it particularly suitable for lifting existing buildings in confined spaces with low headroom. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of step one in this utility model.

[0015] Figure 2 This is a cross-sectional schematic diagram of step two in this utility model.

[0016] Figure 3 This is a cross-sectional schematic diagram of step three in this utility model.

[0017] Figure 4 This is a partial cross-sectional schematic diagram of the initial state of an existing building during the lifting process in this utility model.

[0018] Figure 5 This is a partial cross-sectional schematic diagram of the lifting state of an existing building during the lifting process in this utility model.

[0019] Figure 6This is a partial cross-sectional schematic diagram of the depressurization and retraction state during the lifting process of an existing building in this utility model.

[0020] The labels in the diagram are as follows: 1. Existing building; 2. Tray structure; 3. Piling hole; 4. Steel strand; 5. Anchoring end; 6. Connector; 7. Static pressure pile; 8. Reaction beam; 9. Lifting jack; 10. Perforation; 11. Oil pipe; 12. Hydraulic control system; 13. Plunger; 14. Oil cylinder; 15. Steel shell; 16. Upper limit plate; 17. Upper clamping plate; 18. Lower limit plate; 19. Lower clamping plate; 20. Supporting pile; 21. Basement roof slab; 22. High-strength grouting material; 23. Structural floor slabs of each basement level; 24. Foundation slab; 25. Lower cover plate. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0022] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] This utility model provides a structure for lifting and leveling existing buildings, particularly suitable for developing underground space beneath older, shallow-foundation existing buildings in urban centers where construction sites are limited. This construction method enables the overall lifting of the existing building and addresses any tilting issues. Combined with foundation pit support technology, it allows for the development of underground space beneath the existing building, thereby achieving the goal of enhancing the building's functionality. A detailed description is provided below with reference to the accompanying drawings.

[0025] The structure of this utility model is shown in the figure. Figure 3The existing building 1 has a shallow foundation. The shallow foundation is widened and reinforced to form a tray structure 2, which supports the existing building 1. Piling holes 3 are provided on the tray structure 2. Anchor static pressure piles 7 are driven into the pile holes 3. A reaction beam 8 is provided on the top of the anchor static pressure piles 7. A lifting jack 9 is provided on the reaction beam 8. The lower end of the vertically arranged steel strand 4 is anchored to the tray structure 2. The upper end of the steel strand 4 passes through the reaction beam 8 and is connected to the lifting jack 9. Each lifting jack 9 is connected to the hydraulic control system 12 through an oil pipe.

[0026] The construction steps of this utility model are as follows: Figures 1-6 As shown, a building lifting method for developing underground space under existing buildings is described. The foundation of existing building 1 is a shallow foundation. The specific construction steps are as follows:

[0027] Step 1 as follows Figure 1 As shown, the shallow foundation of the existing building 1 is first widened and reinforced to form a tray structure 2. Piling holes 3 are pre-drilled in the tray structure 2, and vertical steel strands 4 are pre-embedded. Anchor ends 5 are provided at the bottom of the steel strands 4 to facilitate a better connection with the tray structure 2, and connectors 6 are provided at the top of the steel strands 4. Anchor static piles 7 are then driven into the piling holes 3.

[0028] Step Two Figure 2 As shown, a reaction beam 8 is installed on top of the anchor static pressure pile 7, and a lifting jack 9 is installed on top of the reaction beam 8. Steel strand 4 is extended via connector 6 and passes through a pre-drilled hole 10 on the reaction beam 8 to connect with the lifting jack 9. Each lifting jack 9 is connected to the hydraulic control system 12 via an oil pipe 11.

[0029] Step 3 as follows Figure 3 As shown, the hydraulic control system 12 is activated, and the lifting jack 9 is pushed up through the oil pipe 11, which in turn drives the pallet structure 2 and the existing building 1 to be lifted upward through the steel strand 4.

[0030] Step 3: The specific building improvement process is as follows Figures 4-6 As shown.

[0031] Step 1 Initial state as follows: Figure 4As shown, the lifting jack 9 includes a plunger 13, a hydraulic cylinder 14, a steel outer shell 15, an upper limiting device, and a lower limiting device. The upper limiting device includes an upper limiting plate 16 and an upper clamping plate 17; inserting the upper clamping plate 17 into the upper limiting plate 16 forms the upper limiting device, which is located at the top of the lifting jack 9, above the plunger 13. The upper clamping plate 17 is conical in shape, wider at the top and narrower at the bottom. After the steel strand 4 passes through the upper limiting device, it can only pass through the upper limiting device upwards. Because the upper clamping plate 17 is wider at the top and narrower at the bottom, when the steel strand 4 moves downwards, the conical upper clamping plate 17 will stop the steel strand 4 from moving downwards, thus achieving the one-way limiting function that prevents the steel strand 4 from passing downwards through the upper limiting device. Similarly, the lower limit plate 18 and the lower clamping plate 19 form a lower limiting device with the same unidirectional limiting function. The lower limiting device is located at the bottom of the lifting jack 9 and the lower part of the hydraulic cylinder 14. The lower cover plate 25 covers the lower limit plate 18, and its function is to restrict the lower clamping plate 19 from moving upward synchronously with the upward movement of the steel strand 4. The steel strand 4 passes through the lower clamping plate 19, the lower cover plate 25, the hydraulic cylinder 14, the plunger 13, and the upper clamping plate 17 from bottom to top.

[0032] Step 2: Improve your condition as follows Figure 5 As shown, the hydraulic control system 12 injects oil into the cylinder 14 through the oil pipe 11, pushing the plunger 13 upward. The upper limiting device, consisting of the upper clamping plate 17 and the upper limit plate 16, moves upward with the plunger 13. Due to the presence of the upper limiting device, the steel strand 4 cannot move downward relative to the upper limiting device, so the steel strand 4 also moves upward, thereby driving the pallet structure 2 and the existing building 1 upward, thus achieving building lifting. At this time, the load transfer path of the existing building 1 is as follows: Existing building 1 → Pallet structure 2 → Steel strand 4 → Upper limit plate 16 → Plunger 13 → Cylinder 14 → Reaction beam 8 → Anchor static pressure pile 7. The lifting jack 9 has a limited lifting stroke per cycle and cannot lift the building into position in one go; a single lift is generally about 10cm.

[0033] Step 3: The jack is in the depressurization and retraction state as follows: Figure 6 As shown, the hydraulic control system 12 draws oil out of the cylinder 14 through the oil pipe 11, and the plunger 13 falls downward. The upper limit plate 16 and the upper clamping plate 17 disengage, and the upper limit plate 16 falls downward with the plunger 13. The upper clamping plate 17 is fixed to the steel strand 4 in its original position, i.e., the position after being lifted in Step 2 above. At this time, due to the presence of the lower limit device composed of the lower limit plate 18 and the lower clamping plate 19, the steel strand 4 and the existing building 1 connected to it will not displace downward with the depressurization and retraction of the jack. In this state, the load transfer path of the existing building 1 is as follows: Existing building 1 → tray structure 2 → steel strand 4 → lower limit plate 18 → reaction beam 8 → anchor static pressure pile 7.

[0034] Remove the upper clip 17 and insert it back into the upper limit plate 16 to restore the initial lifting state.

[0035] Repeat Steps 1 through 3 until the existing building 1 is raised to the set height. If the existing building 1 has an overall tilt problem, during the lifting process, the hydraulic control system 12 can be used to control each lifting jack 9 to raise it to a different height, thereby leveling the existing building 1 while lifting.

[0036] In summary, this technology utilizes anchored static pressure piles as the vertical support structure during the lifting process of existing buildings. A system consisting of lifting jacks, limiting devices, steel strands, a hydraulic control system, and reaction beams is used to lift and level the building. Combined with foundation pit support technology, this allows for the development and construction of underground space beneath existing buildings. The goal of enhancing building functionality is achieved while ensuring the safety of the existing structure.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A structure for lifting and leveling an existing building, wherein the foundation of the existing building (1) is a shallow foundation, and the shallow foundation is widened and reinforced to form a tray structure (2), the tray structure (2) supporting the existing building (1); characterized in that: The pallet structure (2) is provided with pile holes (3); the anchor static pressure pile (7) is pressed into the pile hole (3); the top of the anchor static pressure pile (7) is provided with a reaction beam (8); the reaction beam (8) is provided with a lifting jack (9), and the lower end of the vertically arranged steel strand (4) is anchored on the pallet structure (2); the upper end of the steel strand (4) passes through the reaction beam (8) and is connected to the lifting jack (9), and each lifting jack (9) is connected to the hydraulic control system (12) through an oil pipe.

2. The structure for lifting and leveling existing buildings according to claim 1, characterized in that: The lifting jack (9) includes a plunger (13), a hydraulic cylinder (14), a steel outer shell (15), an upper limiting device, and a lower limiting device. The upper limiting device includes an upper limiting plate (16) and an upper clamping plate (17). The upper clamping plate (17) is a cone shape, wider at the top and narrower at the bottom, and can be inserted into or pulled out of the upper limiting plate (16). The lower limiting device includes a lower limiting plate (18) and a lower clamping plate (19). It is a cone shape with a larger top and a smaller bottom, which can be inserted into or pulled out of the lower limiting plate (18); the lower cover plate (25) is located above the lower limiting plate (18), and the lower cover plate (25) restricts the lower clamping piece (19) from moving upward away from the lower limiting plate (18); the steel strand (4) passes through the lower clamping piece (19), the lower cover plate (25), the oil cylinder (14), the plunger (13) and the upper clamping piece (17) from bottom to top respectively.

3. The structure for lifting and leveling existing buildings according to claim 1, characterized in that: The steel strand (4) is pre-embedded on the pallet structure (2). An anchor end (5) is provided at the bottom of the steel strand (4) and connected to the pallet structure (2). A connector (6) is provided at the top of the pre-embedded steel strand (4). The steel strand (4) is extended through the connector (6) and connected to the lifting jack (9).

4. The structure for lifting and leveling existing buildings according to claim 1, characterized in that: The steel strand (4) passes through the pre-reserved through hole (10) on the reaction beam (8).

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