A method for reinforcing a pile foundation of a high-rise building structure
By employing a combination of reinforced piles and support beams in the raft foundation, and through steps such as basement water pressure relief, pile driving, support, and pressurization, the problem of insufficient bearing capacity of anchor static pressure piles was solved. This improved the stability and waterproofing of the pile foundation of high-rise buildings while saving construction costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI CONSTRUCTION FIRST CONSTRUCTION (GROUP) CO LTD
- Filing Date
- 2023-12-04
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, the bearing capacity of anchored static pressure piles is limited, making it difficult to meet the reinforcement requirements of pile foundations for high-rise buildings. At the same time, conventional reinforcement methods may affect the waterproofing of buildings.
By reinforcing the existing pile foundation of the building through steps such as basement water pressure relief, pile driving, support, and pressurization, and combining the new construction of raft foundation, a pile-raft structure is formed to achieve improved load-bearing capacity and waterproof protection.
It effectively improves the stability and waterproofing of the existing pile foundation of the building, enhances the integrity and strength of the building foundation, and saves costs and reduces the construction period during construction.
Smart Images
Figure CN117738486B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of building construction, and in particular to a method for reinforcing pile foundations for adding floors to high-rise building structures. Background Technology
[0002] Currently, before adding floors to a building, it is necessary to reinforce the building's pile foundation to improve its bearing capacity and thus meet the building's stability requirements.
[0003] Among common reinforcement techniques, the most prevalent is the use of anchored static pressure piles, which involves driving piles using the reaction force provided by anchors fixed in the existing foundation. These piles are typically small-section piles. The equipment used is simple and easy to operate.
[0004] However, because driven piles are small-section piles, their bearing capacity is limited, making it difficult to meet the requirements for pile foundation reinforcement of high-rise buildings. Summary of the Invention
[0005] This application provides a method for reinforcing pile foundations for adding floors in high-rise building structures. This method provides sufficient bearing capacity to the pile foundation without affecting its waterproofing. The technical solution is as follows:
[0006] A method for reinforcing pile foundations for adding floors in high-rise building structures includes the following steps:
[0007] Basement water pressure relief; openings are made in the original foundation slab of the building to construct dewatering wells, lowering the basement water level below the foundation slab;
[0008] Piling; driving reinforcing piles into the ground; the top of the reinforcing piles being higher than the ground surface;
[0009] Support; erecting a support structure between the pile foundation and the reinforced piles;
[0010] The supporting structure includes a supporting beam; the top of the reinforcing pile is connected to the pile foundation through the supporting beam.
[0011] Pressurization; the load of the pile foundation is transferred to the reinforcing pile through the supporting beam, thereby achieving pressurization of the reinforcing pile;
[0012] The foundation slab is laid; the foundation slab is a raft slab, and the reinforcing piles and the raft slab constitute a pile-raft foundation.
[0013] By adopting the above technical solution, which involves opening holes in the original foundation slab of the building to release water pressure in the basement, it is possible to effectively control the pressurized water and create a dry working environment in advance.
[0014] Reinforcing the existing pile foundation of a building using reinforcing piles and supporting beams can effectively improve its stability. The reinforcing piles also directly support the building, further enhancing its overall stability. Conversely, removing the existing foundation slab and constructing a new raft foundation can effectively improve the overall integrity of the foundation, resulting in high strength and excellent waterproofing and moisture-proofing properties. Applying pressure to the reinforcing piles allows the building's weight to be transferred, thus enhancing their supporting effect on the structure.
[0015] Preferably, the reinforcing piles are provided in multiples and evenly distributed on both sides opposite to the pile foundation; the pile foundation includes a pile cap; the support beam passes through the pile cap, and both ends of the support beam are respectively connected to two reinforcing piles located on both sides opposite to the pile foundation.
[0016] By adopting the above technical solution, a support beam is used to support the pile cap of the pile foundation, and the support beam is connected to the reinforcement pile, so that the reinforcement pile provides support force to the pile foundation, thereby achieving the purpose of pile foundation reinforcement.
[0017] Preferably, the reinforcing pile is disposed between two adjacent pile foundations of the building; both ends of the supporting beam are connected to the two pile foundations respectively, and the center of the supporting beam is connected to the reinforcing pile.
[0018] By adopting the above technical solution, reinforcement piles can also be set between two pile foundations of a building, so that the reinforcement piles can reinforce two pile foundations at the same time, which not only achieves the reinforcement effect, but also saves the construction period and helps to save construction costs.
[0019] Preferably, a pressure cylinder is provided at the top of the reinforcing pile; the cylinder body and the output end of the pressure cylinder are respectively connected to the top of the reinforcing pile and the support beam.
[0020] By adopting the above technical solution, when the pressure cylinder is lifted, the reaction force of the building is applied to the reinforcement pile through the pressure cylinder, thereby making the reinforcement pile more stable and enabling the reinforcement pile to directly share the weight of the building, thus improving the reinforcement effect.
[0021] Preferably, the support beam is a steel beam; a support column is provided on the steel beam, the support column is vertically inserted through the steel beam, and the bottom of the support column abuts against the reinforcing pile;
[0022] During the pressurization process, the support column maintains a contact relationship with the reinforcement pile under its own weight; after the pressurization is completed, the support column is welded to the support beam.
[0023] By adopting the above technical solution, during pressurization, the reinforcing piles will slightly sink due to the weight of the building itself. At this time, the support column can move down with the reinforcing pile under its own weight, maintaining a contact relationship with the reinforcing pile. After pressurization is completed, the support column and support beam are welded together. When the pressurization cylinder is removed, the weight of the building can be transferred to the reinforcing pile through the support beam and support column.
[0024] Preferably, the reinforcing pile is a bored cast-in-place pile, and a casing is installed before driving the reinforcing pile; the support column and support beam are both welded to the casing.
[0025] By adopting the above technical solutions, bored piles have the advantages of high strength and mature construction technology. The casing not only facilitates the smooth construction of bored piles, but also strengthens them, further enhancing their strength and bearing capacity, thereby improving the reinforcement effect on building pile foundations.
[0026] Preferably, the supporting beam is a concrete beam; multiple sets of pressure cylinders are provided and distributed on both sides of the reinforcing pile; the pressure cylinders are connected to the reinforcing pile through a connecting frame;
[0027] After pressurization is completed, a casting template is set between the reinforcing pile and the support beam, and the support column is cast in the casting template to realize the connection between the reinforcing pile and the support beam.
[0028] By adopting the above technical solution, after pressurization, the connection between the reinforcing pile and the support beam can be achieved by pouring concrete between the reinforcing pile and the support beam. This can effectively ensure that the weight of the building can be transferred to the reinforcing pile through the support beam, thereby ensuring the load-bearing effect of the reinforcing pile on the building.
[0029] Preferably, anchor rods are pre-embedded in the borehole grouting; the support beam is connected to the anchor rods.
[0030] By adopting the above technical solution, the setting of pre-embedded anchor rods can realize the connection between the support beam and the reinforcement pile, which helps to improve the integrity of the support beam and the reinforcement pile, improve their stability, thereby improving the support effect of the support beam and the reinforcement pile on the pile foundation and the building itself, and improving the load performance of the support beam and the reinforcement pile.
[0031] Preferably, when laying the raft foundation reinforcement, the raft foundation reinforcement is connected to the support beam; when casting the raft foundation, the support beam is cast inside the raft foundation.
[0032] By adopting the above technical solution, the raft foundation and supporting beams are interconnected. The supporting beams effectively enhance the strength of the raft foundation, thereby improving its load-bearing capacity and strengthening the building. The reinforcing piles, together with the raft foundation, form a pile-raft foundation, which also effectively improves the building's stability. Therefore, the combination of the raft foundation, supporting beams, and reinforcing piles significantly enhances the building's reinforcement effect.
[0033] In summary, the present invention has at least one of the following beneficial technical effects:
[0034] 1. Reinforcing the existing pile foundation of a building using reinforcement piles and support beams can effectively improve the stability of the existing pile foundation. The reinforcement piles also directly support the building, further enhancing its stability. Conversely, removing the original foundation slab and constructing a new raft foundation can effectively improve the overall integrity of the building foundation, resulting in high strength and excellent waterproofing and moisture-proofing properties.
[0035] 2. By employing a pressure cylinder, the weight of the building is applied to the reinforcement piles, thereby increasing the construction strength of the reinforcement piles and ensuring that they can provide better support for the building. Furthermore, by using movable support columns, a stable connection between the support beam and the reinforcement piles is ensured during pile sinking. Therefore, even after the pressure cylinders are removed, the weight of the building can still be stably transferred to the reinforcement piles through the support beams, and the change in stress on the reinforcement piles before and after the removal of the pressure cylinders can be effectively reduced, ensuring the reinforcement effect of the pile foundation.
[0036] 3. The raft foundation and supporting beams are interconnected, allowing the supporting beams to effectively enhance the strength of the raft foundation, thereby improving its load-bearing capacity and strengthening the building. The reinforcing piles, together with the raft foundation, form a pile-raft foundation, which also effectively improves the building's stability. Therefore, the combination of the raft foundation, supporting beams, and reinforcing piles significantly enhances the strengthening effect on the building. Attached Figure Description
[0037] Figure 1 This is a schematic diagram of one structural form of the reinforced pile, support beam, and pile foundation in Embodiment 1 of this application;
[0038] Figure 2 This is a schematic diagram of another structural form of the reinforcing pile, supporting beam and pile foundation in Embodiment 1 of this application;
[0039] Figure 3 yes Figure 1 A magnified view of part A in the middle;
[0040] Figure 4 This is a structural schematic diagram of the reinforcing pile, supporting beam, and pile foundation in Embodiment 2 of this application.
[0041] The following labels are used in the attached diagram: 1. Foundation pile; 2. Pile cap; 3. Reinforcing pile; 4. Support structure; 41. Support beam; 42. Load-bearing component; 5. Pressurized hydraulic cylinder; 6. Load-bearing plate; 61. Sleeve; 62. Base plate. Detailed Implementation
[0042] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.
[0043] Example 1
[0044] This application discloses a method for reinforcing pile foundations for adding floors to high-rise building structures, mainly used for reinforcing existing buildings by adding floors or for correcting structural deviations. It is primarily applied to buildings without raft foundations. (See also...) Figure 1 The pile foundation of the building includes foundation pile 1 and pile cap 2.
[0045] The reinforcement method for pile foundations used for adding floors in high-rise buildings includes the following steps:
[0046] S1, basement water pressure relief.
[0047] An opening was made in the original foundation slab of the building's basement to construct a dewatering well, lowering the basement water level below the foundation slab.
[0048] S2, pile driving.
[0049] The reinforcing piles in this embodiment are bored cast-in-place piles. As a preferred embodiment, static pressure piles or similar materials can also be used. First, a casing is installed on the ground. The casing is positioned relative to the pile foundation, within a 3m radius centered on the pile foundation. To improve construction efficiency, the casing can be installed using a vibratory sinking method.
[0050] The number of casings is set according to the number of reinforcing piles 3 to be driven.
[0051] After the casing is installed, the top of the casing must be higher than the ground. In this embodiment, to ensure the smooth progress of subsequent construction, the top of the casing is 30-50cm above the ground.
[0052] Using the casing as a reference, reinforcement piles 3 are driven into the ground;
[0053] The number of reinforcing piles 3 is based on the reinforcement requirements of the pile foundation. One, two, three, or more can be used. It should be noted that when reinforcing a specific pile foundation, the number of reinforcing piles 3 is preferably even, such as two, and the two reinforcing piles 3 are symmetrically arranged on both sides of the pile foundation. For other cases, such as when reinforcing the entire building foundation, there is no limit to the number of reinforcing piles 3.
[0054] Finally, pre-embedded anchor rods need to be installed at the top of reinforced pile 3. The pre-embedded anchor rods extend upwards to the top of reinforced pile 3.
[0055] S3, support.
[0056] A support structure 4 is erected between the pile foundation and the reinforcing pile 3. The support structure 4 includes a support beam 41 and a load-bearing component 42. In this embodiment, to improve construction efficiency and ensure sufficient strength of the support beam 41, a steel beam is used for the support beam 41. The load-bearing component 42 is a steel support column. The support column is inserted into the support beam 41 and can slide up and down.
[0057] The placement of the support beam 41 needs to be based on the relative positions of the reinforcing pile 3 and the pile foundation. This includes two construction scenarios:
[0058] Reference Figure 1 The first scenario is that the reinforcing piles 3 are symmetrically distributed on both sides of the pile foundation. In this case, the support beam 41 needs to pass through the bottom of the pile cap (the land needs to be excavated to the bottom of the pile cap in step S1, exposing the foundation piles 1), and both ends of the support beam 41 extend to the top of the two reinforcing piles 3 respectively, so that the bottom end of the support column abuts against the top end of the reinforcing pile 3.
[0059] Reference Figure 2 In the second scenario, the reinforcing pile 3 is placed between two pile foundations. In this case, the two ends of the support beam 41 need to be placed at the bottom of the two pile caps 2 respectively, and the middle part of the support beam 41 needs to be placed above the reinforcing pile 3. Similarly, the bottom end of the support column needs to abut against the top end of the reinforcing pile 3.
[0060] In both of the above situations, if it is not possible to excavate the soil to the bottom of the pile cap 2, the support beam 41 can be connected to the pile cap 2 by planting reinforcement anchoring.
[0061] The support beam 41 has holes for pre-embedded anchor rods to pass through.
[0062] S4, pressurize.
[0063] Reference Figure 1 and Figure 3 A pressure cylinder 5 is installed on one side of the support beam 41, with its output end abutting against the bottom of the support beam 41. A load-bearing plate 6 is installed between the pressure cylinder 5 and the reinforcing pile 3. The load-bearing plate 6 includes a base plate 62 and a sleeve 61 mounted on the base plate 62. The sleeve 61 is fitted onto the top of the reinforcing pile 3, and the base plate 62 extends to the horizontal side of the sleeve 61. The cylinder body of the pressure cylinder 5 is connected to the base plate 62.
[0064] Activating the pressurizing cylinder 5 applies downward pressure to the reinforcing pile 3, transferring the load of the pile foundation to the reinforcing pile 3, thereby improving the stability and bearing capacity of the reinforcing pile 3.
[0065] During the pressurization process, when the reinforcing pile 3 slightly shifts downward, the support column maintains contact with the reinforcing pile 3 under its own weight. After pressurization is completed, the support column is welded to the support beam 41, fixing the support column to the support beam 41, thereby achieving a stable connection between the support beam 41 and the reinforcing pile 3.
[0066] Meanwhile, the support columns and steel beams can be selectively welded to the casing to improve the integrity of the reinforcing piles 3 and the support beams 41.
[0067] Finally, remove the pressure cylinder 5, and the load-bearing plate 6 can remain on the reinforcing pile 3 without needing to be removed.
[0068] A nut is installed on the part of the pre-embedded screw located above the support beam 41. After tightening the nut, the connection between the support beam 41 and the reinforcing pile 3 is achieved.
[0069] S5, Foundation slab laying.
[0070] The foundation slab is a raft slab, forming a raft foundation. That is, the raft slab reinforcement is laid first, and then the column concrete is poured.
[0071] When laying the raft foundation reinforcement, the reinforcement is connected to the support beam 41 using methods such as welding or wire binding. Furthermore, during concrete pouring, the support beam 41 is cast into the raft foundation, connecting the raft foundation to the support beam 41. The support beam 41 effectively enhances the load-bearing capacity of the raft foundation. The reinforcing piles 3 and the raft foundation together form a pile-raft foundation, effectively improving the stability of the building.
[0072] By following the steps above, a reinforcing structure can be added to the pile foundation of the building, thereby strengthening the pile foundation and the building foundation.
[0073] Example 2
[0074] This application discloses a method for reinforcing pile foundations for adding floors to high-rise building structures. The difference from Embodiment 1 is that the support beam 41 in this embodiment is a concrete beam.
[0075] The supporting beam 41 can be connected to the pile cap 2 by concrete pouring.
[0076] Reference Figure 4 The load-bearing component 42 is designed as a post-cast concrete column. That is, after the pressure is applied, a casting template is set between the reinforcing pile 3 and the supporting beam 41, and the concrete is poured into the casting template to achieve the connection between the reinforcing pile 3 and the supporting beam 41.
[0077] For the connection between the support beam 41 and the embedded bolt, either a nut connection can be used, or concrete can be injected into the hole to fill the gap and connect the support beam 41 and the embedded bolt. Alternatively, an adhesive connection can also be used.
[0078] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A method for reinforcing pile foundations for adding floors in high-rise building structures, characterized in that: Includes the following steps: Basement water pressure relief; openings are made in the original foundation slab of the building to construct dewatering wells, lowering the basement water level below the foundation slab; Piling; driving reinforcing piles (3) into the ground; the top of the reinforcing piles (3) is higher than the ground; Support; erect a support structure (4) between the pile foundation and the reinforced pile (3); The supporting structure (4) includes a supporting beam (41); the top of the reinforcing pile (3) is connected to the pile foundation through the supporting beam (41); Pressure is applied; the load of the pile foundation is transferred to the reinforcing pile (3) through the supporting beam (41), thereby achieving pressure on the reinforcing pile (3); Foundation slab laying; the foundation slab is a raft slab, and the reinforcing piles (3) together with the raft slab form a pile-raft foundation; The reinforcing piles (3) are provided in multiple and evenly distributed on both sides of the pile foundation opposite to each other. The pile foundation includes a pile cap (2). The supporting beam (41) passes through the pile cap (2) and the two ends of the supporting beam (41) are respectively connected to two reinforcing piles (3) located on both sides of the pile foundation opposite to each other. Alternatively, the reinforcing piles (3) are provided between two adjacent pile foundations of the building. The two ends of the supporting beam (41) are respectively connected to two pile foundations. The center of the supporting beam (41) is connected to the reinforcing piles (3). The support beam (41) is a steel beam; a support column is provided on the steel beam, the support column is vertically inserted on the steel beam, and the bottom of the support column abuts against the reinforcing pile (3); During the pressurization process, the support column maintains a contact relationship with the reinforcing pile (3) under its own weight; after the pressurization is completed, the support column is welded to the support beam (41).
2. The reinforcement method for pile foundations for adding floors in high-rise building structures according to claim 1, characterized in that: A pressure cylinder (5) is installed at the top of the reinforcing pile (3); the cylinder body and output end of the pressure cylinder (5) are respectively connected to the top of the reinforcing pile (3) and the support beam (41).
3. The reinforcement method for pile foundations for adding floors in high-rise building structures according to claim 1, characterized in that: The reinforcing piles are bored cast-in-place piles, and a casing is installed before driving the reinforcing piles (3); the support columns and support beams are welded to the casing.
4. The reinforcement method for pile foundations for adding floors in high-rise building structures according to claim 3, characterized in that: A bearing plate (6) is provided between the pressurizing cylinder (5) and the reinforcing pile (3); the bearing plate (6) includes a base plate (62) and a sleeve (61) provided on the base plate (62), the sleeve (61) being sleeved to the top of the reinforcing pile (3); the base plate (62) extends to one side of the sleeve (61) in the horizontal direction; the pressurizing cylinder (5) is connected to the base plate (62).
5. The reinforcement method for pile foundations for adding floors in high-rise building structures according to claim 4, characterized in that: Anchor rods are pre-embedded on the bored piles; the support beam (41) is connected to the anchor rods.
6. The reinforcement method for pile foundations for adding floors in high-rise building structures according to claim 1, characterized in that: When laying the raft slab reinforcement, the raft slab reinforcement is connected to the support beam (41); when casting the raft slab, the support beam (41) is cast inside the raft slab.