Prestressed cast-in-situ bored pile for foundation pit support
By combining external concrete columns, internal concrete columns, and support mechanisms, the problem of insufficient mechanical performance of bored piles under complex geological conditions is solved, thereby improving structural stability and bearing capacity, and reducing construction difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG YINCHEN CONSTR CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-28
AI Technical Summary
Existing bored piles have limited mechanical performance improvement when facing complex geological conditions and large soil lateral pressure, and are difficult and costly to process.
The structure employs a combination of external concrete columns, internal concrete columns, support mechanisms, and adjustment mechanisms. Through the tight connection between the external steel bars and the external fixing ring, the coordination between the internal steel bars and the internal fixing ring, the application of prestressed tendons, and the adjustment function of the adjustment mechanism, a synergistic effect is formed between the internal and external components, enhancing the stability and bearing capacity of the pile structure.
It significantly improves the structural integrity and bearing capacity of cast-in-place piles, enabling them to better adapt to complex geological conditions and changes in foundation pit depth, and reducing construction difficulty and cost.
Smart Images
Figure CN224173301U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building construction technology, and in particular to a prestressed foundation pit retaining borehole cast-in-place pile. Background Technology
[0002] Drilled piles, as a key type of pile foundation, were developed in the 1940s with the successful development of high-power drilling equipment. Since then, due to the increasing demand for high-rise, super high-rise, and heavy structures, they have been widely used worldwide. The process involves drilling a hole at the pile location using a drilling machine, inserting a steel reinforcement cage, and then pouring concrete to form the pile. Depending on the drilling equipment's operation in the soil aquifer, there are two construction methods: mud wall drilling and dry drilling. Drilled piles have the characteristics of high safety, strong stability, no vibration, no soil displacement, and low noise. They can effectively control foundation settlement and play an indispensable role in the foundation pit support of various projects.
[0003] A search revealed that Chinese publication number CN105113486 specifically discloses a bored pile, including a pile body with a circular cross-section. The pile body contains a regular polygonal reinforcing cage, which includes anti-reflective reinforcement, soil-facing reinforcement, and structural reinforcement. The structural reinforcement is arranged in a regular polygon, which is divided into an intersecting soil-facing surface and an anti-reflective surface. The soil-facing reinforcement is located on the soil-facing surface, and the anti-reflective reinforcement is located on the anti-reflective surface, with the density of the anti-reflective reinforcement being 2 to 3 times that of the soil-facing reinforcement.
[0004] The patent description states that "this solution uses a steel cage with a regular octagonal cross-section, which facilitates the winding of the reinforcing bars 30 and also increases the number of the steel bars 11 facing the soil and the steel bars 21 facing the soil." However, in actual construction, compared with conventionally shaped steel cages, the processing and manufacturing difficulty is greatly increased, requiring more precise processing technology and professional equipment. This undoubtedly increases the construction cost and technical threshold. Furthermore, relying solely on increasing the number of reinforcing bars in a regular octagonal steel cage to improve the performance of the cast-in-place pile has limited effect on improving mechanical performance when facing complex geological conditions and large soil lateral pressure. Therefore, a prestressed foundation pit retaining borehole cast-in-place pile is proposed to solve the above problems. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a prestressed foundation pit retaining borehole cast-in-place pile, which aims to improve the limited mechanical performance improvement effect of the existing technology when facing complex geological conditions and large soil lateral pressure.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A prestressed foundation pit retaining bored pile includes an outer concrete column and outer reinforcing bars. The outer concrete column has a support mechanism inside, and the outer reinforcing bars have an adjustment mechanism outside. The support mechanism includes multiple outer fixing rings, which are externally fixedly connected to the interior of the outer concrete column. The outer reinforcing bars are externally fixedly connected to the interior of the multiple outer fixing rings. The outer concrete column has multiple connecting bars fixedly connected inside, and the connecting bars are externally fixedly connected to an inner column. The inner column has multiple inner fixing rings inside, and each of the multiple inner fixing rings has multiple inner reinforcing bars fixedly connected inside. The multiple outer fixing rings have connecting components inside.
[0008] The above technical solution involves setting up an external concrete column, external reinforcing bars, and a support mechanism. The external fixing ring is tightly fixed inside the external concrete column, providing stable support for the external reinforcing bars. The external reinforcing bars are connected to the external fixing ring, which makes the position of the external reinforcing bars stable during concrete pouring and stress. This effectively enhances the structural strength of the external concrete column, thereby improving the overall ability of the cast-in-place pile to resist external forces, especially enhancing its ability to withstand lateral pressure.
[0009] As a further description of the above technical solution:
[0010] The external reinforcing bars are externally fixedly connected to the interior of the external concrete column, and the external reinforcing bars are externally fixedly connected to the interior of the internal column;
[0011] Through the above technical solution, the outer steel bars are firmly connected to the outer concrete column, ensuring that the outer steel bars can fully play their role in enhancing tensile strength inside the outer concrete column. The inner steel bars are firmly connected to the inner column, ensuring the strength and stability of the inner column. The two work together to strengthen both the internal and external structures of the cast-in-place pile, improve the overall bearing capacity and durability, and better cope with complex geological conditions and the stress environment of the foundation pit.
[0012] As a further description of the above technical solution:
[0013] The inner column is externally fixedly connected to the interior of the outer concrete column, and multiple outer fixing rings are distributed in an axial array inside the outer concrete column;
[0014] Through the above technical solution, the inner column and the outer concrete column are fixedly connected to form an organic whole, which greatly improves the structural integrity of the cast-in-place pile. The outer fixing ring is axially arrayed inside the outer concrete column, making the support of the outer steel bars more uniform, optimizing the stress distribution of the outer concrete column, and further improving the stability and bearing capacity of the cast-in-place pile, so that it can adapt to different foundation pit depths and changes in the pressure of the surrounding soil.
[0015] As a further description of the above technical solution:
[0016] The connecting assembly includes multiple prestressed tendons, the exterior of which are respectively fixedly connected to the interior of multiple outer fixing rings, and the exterior of which are fixedly connected to limiting blocks;
[0017] Through the above technical solution: the prestressing tendons in the connecting components are fixed inside the outer fixing ring, creating conditions for applying prestress to the cast-in-place pile. The prestressing tendons can effectively offset part of the tensile force generated by the load, improving the crack resistance of the cast-in-place pile. The limiting block is connected to the outside of the prestressing tendons, which plays a limiting role in the prestressing tendons, ensuring that the prestressing tendons remain stable during operation, and ensuring the accuracy and stability of the prestress application.
[0018] As a further description of the above technical solution:
[0019] The bottom ends of the plurality of limiting blocks are in contact with the top end of the outer concrete column, and the external parts of the plurality of prestressing tendons are fixedly connected to the interior of the outer concrete column;
[0020] The above technical solution restricts the contact between the bottom of the block and the top of the outer concrete column, further constrains the displacement of the prestressing tendons, prevents excessive movement of the prestressing tendons during the stress process, ensures stable transmission of prestress to the outer concrete column, and fixes the prestressing tendons to the outer concrete column, so that the prestress can be applied evenly to the outer concrete column, improves the structural performance of the outer concrete column, and enhances the ability of the cast-in-place pile to resist deformation and damage.
[0021] As a further description of the above technical solution:
[0022] The adjusting mechanism includes a ring rib, the outer side of which is fixedly connected to the outside of the outer steel bar. The outer side of the ring rib is fixedly connected to a fixing block one and a fixing block two. The inner side of the fixing block one is fixedly connected to a fixing screw, and the outer side of the fixing screw is threaded with a rotating screw.
[0023] The above technical solution includes an adjustment mechanism with ring ribs connected to the outer steel bars and the outer concrete column, which enhances the stability of the outer steel bars. The setting of fixed block one, fixed block two, fixed screw and rotating screw makes it possible to adjust the ring ribs. Rotating the rotating screw can drive fixed block two to move by using the thread engagement principle, thereby realizing the adjustment of the diameter and curvature of the ring ribs to adapt to different stress conditions and improve the adaptability and structural performance of the cast-in-place pile.
[0024] As a further description of the above technical solution:
[0025] The outer side of the rotating screw is in contact with the outer side of the second fixed block, and the outer side of the fixed screw is slidably connected to the inner side of the second fixed block;
[0026] Through the above technical solution, the rotating screw contacts the fixed block two and cooperates with the sliding connection of the fixed screw, so that the fixed block two can move smoothly along the axis of the fixed screw, ensuring the accuracy and stability of the ring rib adjustment process. This precise and stable adjustment mechanism can accurately adjust the shape of the ring rib according to the actual engineering needs, optimize the local structure of the cast-in-place pile, and improve its lateral stiffness and bearing capacity.
[0027] As a further description of the above technical solution:
[0028] The outer side of the ring rib is fixedly connected to the inside of the outer concrete column, and the outer side of the fixing block one is fixedly connected to the inside of the outer concrete column.
[0029] Through the above technical solution, the ring rib is fixedly connected to the outer concrete column and the fixing block, providing a stable support foundation for the ring rib. This allows the ring rib to reliably function during the adjustment process. The solid connection ensures that the ring rib enhances the stability of the outer steel reinforcement while effectively adjusting the pile structure and improving the overall structural stability of the pile. This enables the cast-in-place pile to better withstand external loads, especially in complex foundation pit retaining environments, and maintain good working performance.
[0030] This utility model has the following beneficial effects:
[0031] 1. In this utility model, when making cast-in-place piles, the bottom end of the inner steel bar is first fixed to the hole, and after connecting the inner fixing ring, the mold is put on and concrete is poured to form the inner column. When the inner column hardens, the connecting bar is fixed at its top, and the outer steel bar is connected to the outer fixing ring. After the adjustment mechanism is installed, the outer mold is put on and concrete is poured to form the outer concrete column. The outer concrete column and the inner column are fixed by the connecting bar. The stress side of the outer concrete column is provided with prestressed tendons and limiting blocks. Under this structure, the outer concrete column bears the lateral pressure of the soil, and the inner column shares part of the pressure and bears the axial pressure. The two work together to effectively improve the bearing capacity of the cast-in-place pile, which can adapt to different geological conditions and foundation pit depth requirements, and improve the applicability and safety of the project.
[0032] 2. In this utility model, the ring rib of the adjustment mechanism connects the outer steel bar and the outer concrete column. Rotating the rotating screw drives the fixed block two to move, causing the ring rib to deform and realize the adjustment of diameter and curvature. This adjustment process can enhance the stability of the outer steel bar and prevent it from shifting and deforming during construction and under stress, thereby improving the overall structural stability of the outer concrete column. At the same time, the deformation of the ring rib adjusts the local structure of the pile body, increases the bending resistance, greatly improves the lateral stiffness of the pile body, effectively resists the lateral pressure of the soil, reduces the lateral deformation of the pile body, and effectively maintains the stability of the foundation pit. Attached Figure Description
[0033] Figure 1 This is a three-dimensional schematic diagram of a prestressed foundation pit retaining borehole pile proposed in this utility model;
[0034] Figure 2 This is a schematic diagram of the connecting bar of a prestressed foundation pit retaining borehole pile proposed in this utility model;
[0035] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0036] Figure 4 This is a schematic diagram of the inner fixing ring of a prestressed foundation pit retaining borehole pile proposed in this utility model.
[0037] Legend:
[0038] 1. External concrete column; 2. Support mechanism; 21. Connecting component; 211. Prestressed tendon; 212. Restricting block; 22. External fixing ring; 23. External steel bar; 24. Connecting bar; 25. Internal column; 26. Internal fixing ring; 27. Internal steel bar; 3. Adjustment mechanism; 31. Ring rib; 32. Fixing block one; 33. Fixing block two; 34. Fixing screw; 35. Rotating screw. Detailed Implementation
[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0040] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of a prestressed foundation pit retaining borehole cast-in-place pile, comprising an outer concrete column 1 and outer reinforcing bars 23. The outer concrete column 1, as the outer structure of the cast-in-place pile, is a key component that directly bears the lateral pressure of the soil surrounding the foundation pit. Its strength and structural stability have a significant impact on the overall performance of the cast-in-place pile. The outer reinforcing bars 23 are densely distributed inside the outer concrete column 1, providing strong tensile support for the outer concrete column 1 and effectively enhancing its ability to resist tensile failure caused by external forces. A support mechanism 2 is provided inside the outer concrete column 1. The support mechanism 2 is an important internal structure of the cast-in-place pile and plays a key role in maintaining the overall structural stability of the cast-in-place pile and optimizing the stress distribution. An adjustment mechanism 3 is provided outside the outer reinforcing bars 23. The adjustment mechanism 3 can be flexibly adjusted according to actual engineering needs, significantly improving the adaptability and structural performance of the cast-in-place pile.
[0041] The support mechanism 2 includes multiple outer fixing rings 22, which are axially arrayed inside the outer concrete column 1, acting like a sturdy skeleton to firmly fix the outer steel bars 23 in a predetermined position. The multiple outer fixing rings 22 are externally fixedly connected to the inside of the outer concrete column 1. This tight connection ensures that the outer fixing rings 22 can be stably embedded in the outer concrete column 1, providing a stable and reliable support foundation for the outer steel bars 23. The outer steel bars 23 are externally fixedly connected to the inside of the multiple outer fixing rings 22. The outer fixing rings 22 play a positioning and restraining role for the outer steel bars 23, so that the outer steel bars 23 maintain the correct position during concrete pouring and subsequent stress, and give full play to their function of enhancing the strength of the outer concrete column 1.
[0042] The outer concrete column 1 is internally fixedly connected with multiple connecting bars 24. The connecting bars 24 act as a bridge, undertaking the important mission of connecting the outer concrete column 1 and the inner column 25. The inner column 25 is externally fixedly connected to the multiple connecting bars 24. The inner column 25 is tightly connected to the outer concrete column 1 through the connecting bars 24. The two work together to greatly improve the bearing capacity and stability of the cast-in-place pile. The inner column 25 is internally provided with multiple inner fixing rings 26. Multiple inner steel bars 27 are fixedly connected inside the multiple inner fixing rings 26. The inner steel bars 27 and the inner fixing rings 26 cooperate with each other to enhance the tensile and compressive strength of the inner column 25, ensuring that the inner column 25 can effectively share the pressure of the outer concrete column 1.
[0043] Multiple outer fixing rings 22 are internally equipped with connecting components 21. The connecting components 21 play a core role in the prestressing application of the cast-in-place pile and the overall structural stability. Multiple outer steel bars 23 are externally fixedly connected to the interior of the outer concrete column 1, further strengthening the connection between the outer steel bars 23 and the outer concrete column 1, so that the outer steel bars 23 and the outer concrete column 1 can better cooperate to resist external forces. Multiple inner steel bars 27 are externally fixedly connected to the interior of the inner column 25. The stable connection ensures that the inner steel bars 27 can fully exert the reinforcing effect on the inner column 25. The inner column 25 is externally fixedly connected to the interior of the outer concrete column 1. Through the connection of the connecting bars 24, the inner column 25 and the outer concrete column 1 form an organic whole to jointly cope with the complex stress environment around the foundation pit. Multiple outer fixing rings 22 are arranged in an axial array inside the outer concrete column 1. The evenly distributed outer fixing rings 22 make the support of the outer steel bars 23 more balanced, improving the overall stability and bearing capacity of the outer concrete column 1.
[0044] The connecting assembly 21 includes multiple prestressing tendons 211. The prestressing tendons 211 are key components for imparting prestress to the cast-in-place pile, effectively improving its crack resistance and bearing capacity. The external parts of the multiple prestressing tendons 211 are fixedly connected to the interior of multiple outer fixing rings 22. The outer fixing rings 22 provide stable anchor points for the prestressing tendons 211, ensuring that the prestressing tendons 211 can uniformly transfer the prestress to the outer concrete column 1. The external parts of the multiple prestressing tendons 211 are fixedly connected to limiting blocks 212, which restrict the prestressing... The displacement of the prestressing tendon 211 ensures that the prestressing tendon 211 works stably within the design range. The bottom ends of multiple restraining blocks 212 are in contact with the top end of the outer concrete column 1. This contact method allows the restraining blocks 212 to effectively constrain the prestressing tendon 211, ensuring the stable application of prestress. The external fixed connection of multiple prestressing tendons 211 to the interior of the outer concrete column 1, the tight connection makes the prestressing tendon 211 and the outer concrete column 1 form a coordinated whole, giving full play to the optimization effect of the prestressing tendon 211 on the performance of the cast-in-place pile structure.
[0045] Specifically, the support mechanism 2 plays a key role inside the outer concrete column 1. The outer fixing rings 22 are axially arrayed and tightly fixed inside the outer concrete column 1, forming a stable skeleton that firmly positions and constrains the outer steel bars 23. This structural design ensures that the outer steel bars 23 will not shift during concrete pouring and will always maintain the correct position when the cast-in-place pile is subjected to complex external forces, giving full play to its function of enhancing the strength of the outer concrete column 1 and greatly improving the ability of the outer concrete column 1 to resist external damage. The connecting bar 24 acts like a sturdy bridge, tightly connecting the outer concrete column 1 and the inner column 25, enabling the two to work together. Inside the inner column 25, multiple inner fixing rings 26 and inner steel bars 27 cooperate with each other to enhance the tensile and compressive strength of the inner column 25, enabling it to effectively share the pressure borne by the outer concrete column 1.
[0046] Through this collaborative approach between inner and outer columns, the bearing capacity of the cast-in-place pile is significantly improved, and its stability is greatly enhanced. It can better adapt to the complex and ever-changing stress environment around the foundation pit. The connecting component 21 plays a core role in the application of prestress and the overall structural stability of the cast-in-place pile. Multiple prestressing tendons 211 are firmly fixed inside multiple outer fixing rings 22. The outer fixing rings 22 provide stable anchor points for the prestressing tendons 211, ensuring that the prestress can be evenly transmitted to the outer concrete column 1. The limiting block 212 is connected to the outside of the prestressing tendon 211, and its bottom end contacts the top of the outer concrete column 1, effectively limiting the displacement of the prestressing tendon 211 and ensuring that the prestressing tendon 211 works stably within the design range. This ensures the stable application of prestress, making the prestressing tendon 211 and the outer concrete column 1 form a collaborative organic whole, giving full play to the optimization effect of prestress on the structural performance of the cast-in-place pile, and improving the crack resistance and bearing capacity of the cast-in-place pile.
[0047] Reference Figures 1 to 3 The adjustment mechanism 3 includes a ring rib 31, which is the core component of the adjustment mechanism 3 and plays a crucial role in optimizing the structural performance of the cast-in-place pile. The ring rib 31 is externally fixedly connected to the outside of the outer steel bar 23. The tight connection enables the ring rib 31 to effectively enhance the stability of the outer steel bar 23 and prevent it from shifting or deforming during concrete pouring or stress. The ring rib 31 is externally fixedly connected to a fixing block 1 32 and a fixing block 2 33. The fixing block 1 32 and the fixing block 2 33 act as the adjustment hub of the ring rib 31, providing a basis for the deformation adjustment of the ring rib 31. The fixing block 1 32 is internally fixedly connected to a fixing screw 34. The fixing screw 34 is externally threadedly connected to a rotating screw 35. The fixing screw 34 is a key element of the adjustment, providing guidance and support for the adjustment movement of the rotating screw 35.
[0048] By rotating the rotating screw 35 and utilizing the threaded engagement principle, the movement of the second fixed block 33 can be precisely controlled, thereby achieving the deformation adjustment of the ring rib 31. The outer side of the rotating screw 35 is in contact with the outer side of the second fixed block 33. This contact relationship ensures that the rotating screw 35 can effectively drive the movement of the second fixed block 33. The outer side of the fixed screw 34 is slidably connected to the inside of the second fixed block 33, allowing the second fixed block 33 to move smoothly along the axial direction of the fixed screw 34, ensuring the stability of the ring rib 31 adjustment process. The outer side of the ring rib 31 is fixedly connected to the inside of the outer concrete column 1, further enhancing the structural stability of the outer concrete column 1 and enabling the pile body to better withstand external loads. The outer side of the first fixed block 32 is fixedly connected to the inside of the outer concrete column 1. The stable connection ensures that the first fixed block 32 can provide a stable support foundation for the adjustment of the ring rib 31.
[0049] Specifically, the adjustment mechanism 3 revolves around the ring rib 31, which is of great significance for optimizing the structural performance of the cast-in-place pile. The ring rib 31 is tightly connected to the outer steel bar 23 and the outer concrete column 1, greatly enhancing the stability of the outer steel bar 23 and effectively preventing it from shifting during concrete pouring due to vibration and other operations, as well as from deforming during the stress process of the cast-in-place pile. The fixing block 1 32 and fixing block 2 33 serve as the adjustment hub of the ring rib 31, laying the foundation for the deformation adjustment of the ring rib 31. The fixing screw 34 is fixed inside the fixing block 1 32, and its exterior is threadedly connected to the rotating screw 35, providing precise guidance and stable support for the adjustment movement of the rotating screw 35. By rotating the rotating screw 35, the threaded connection is utilized to adjust the ring rib 31. The principle of the combination allows for precise control of the movement of the second fixed block 33, thereby enabling fine adjustment of the diameter and curvature of the ring rib 31. The contact between the rotating screw 35 and the second fixed block 33 ensures the effective transmission of power, allowing the second fixed block 33 to move smoothly along the axial direction of the fixed screw 34, thus ensuring the stability of the ring rib 31 adjustment process. The firm connection between the ring rib 31 and the outer concrete column 1 and the first fixed block 32 provides a stable support foundation for the ring rib 31, enabling the adjusted ring rib 31 to further enhance the structural stability of the outer concrete column 1, significantly improve the pile's ability to withstand external loads, and allow the cast-in-place pile to flexibly adjust its structural performance according to actual engineering needs, better adapting to different working conditions.
[0050] Working principle: When the operator needs to pour the foundation pit support column, the bottom end of the inner steel bar 27 is fixedly connected to the inside of the hole to be poured. At this time, the inner fixing ring 26 is fixedly connected to multiple inner steel bars 27. Then, the mold is placed on the outside of multiple inner steel bars 27, and then concrete is poured. After the concrete hardens, the inner column 25 is completed. During the hardening process of the inner column 25, multiple connecting bars 24 can be fixed at the top of the inner column 25. Then, multiple outer steel bars 23 are fixedly connected to the outside of the inner column 25. An outer fixing ring 22 is fixedly connected to the outside of multiple outer steel bars 23. Then, the adjustment mechanism 3 is placed on the outside of the outer steel bars 23. Finally, the outer mold is placed on the outside of multiple outer steel bars 23, and then concrete is poured again. After the concrete hardens, the outer concrete column 1 is completed.
[0051] The outer concrete column 1 and the inner column 25 are fixedly connected. Multiple prestressed tendons 211 are provided on the side of the outer concrete column 1 near the stress point. Each prestressed tendon 211 is provided with a limiting block 212. The outer concrete column 1 and the inner column 25 are fixedly connected together by connecting bars 24 to form an integral structure. The outer concrete column 1 mainly bears the lateral pressure from the soil around the foundation pit, while the inner column 25 can share part of the pressure borne by the outer concrete column 1. At the same time, the inner column 25 itself can also bear a certain axial pressure. This combined structure can effectively improve the bearing capacity of the cast-in-place pile, enabling it to better adapt to different geological conditions and foundation pit depth requirements.
[0052] The adjusting mechanism 3 can adjust the diameter and curvature of the ring rib 31 as needed. By rotating the rotating screw 35, the rotating screw 35 drives the fixed block 33 to move, thereby causing the fixed block 33 to deform and thus change the diameter and curvature. The ring rib 31 is fixedly connected to the outer steel bar 23 and the outer concrete column 1, which can enhance the stability of the outer steel bar 23 and prevent it from shifting or deforming during concrete pouring or stress, thereby improving the overall structural stability of the outer concrete column 1, enabling the pile body to better bear external loads and improve the bending stiffness of the pile body. By rotating the rotating screw 35, the ring rib 31 can be deformed, changing its diameter or curvature. This deformation can adjust the local structure of the pile body, increase the bending capacity of the pile body, thereby improving the lateral stiffness of the pile body, better resisting the lateral pressure of the soil around the foundation pit, reducing the lateral deformation of the pile body, and maintaining the stability of the foundation pit.
[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A prestressed foundation pit retaining borehole cast-in-place pile, comprising an outer concrete column (1) and outer reinforcing bars (23), characterized in that: The outer concrete column (1) is provided with a support mechanism (2) inside, and the outer steel bar (23) is provided with an adjustment mechanism (3) outside. The support mechanism (2) includes multiple outer fixing rings (22). The multiple outer fixing rings (22) are fixedly connected to the outside of the outer concrete column (1). The outer steel bar (23) is fixedly connected to the outside of the multiple outer fixing rings (22). The outer concrete column (1) is fixedly connected with multiple connecting bars (24). The multiple connecting bars (24) are fixedly connected to the outside of an inner column (25). The inner column (25) is provided with multiple inner fixing rings (26). The multiple inner fixing rings (26) are all fixedly connected with multiple inner steel bars (27). The multiple outer fixing rings (22) are provided with a connecting component (21).
2. The prestressed foundation pit retaining borehole pile according to claim 1, characterized in that: The external reinforcement bars (23) are externally fixedly connected to the interior of the external concrete column (1), and the external reinforcement bars (27) are externally fixedly connected to the interior of the internal column (25).
3. The prestressed foundation pit retaining borehole pile according to claim 1, characterized in that: The inner column (25) is externally fixedly connected to the interior of the outer concrete column (1), and a plurality of the outer fixing rings (22) are axially arrayed inside the outer concrete column (1).
4. A prestressed foundation pit retaining bored pile according to claim 1, characterized in that: The connecting assembly (21) includes a plurality of prestressed tendons (211), the exterior of the plurality of prestressed tendons (211) being fixedly connected to the interior of a plurality of outer fixing rings (22), and a limiting block (212) being fixedly connected to the exterior of the plurality of prestressed tendons (211).
5. A prestressed foundation pit retaining bored pile according to claim 4, characterized in that: The bottom ends of the plurality of limiting blocks (212) are in contact with the top end of the outer concrete column (1), and the exterior of the plurality of prestressed tendons (211) is fixedly connected to the interior of the outer concrete column (1).
6. A prestressed foundation pit retaining bored pile according to claim 1, characterized in that: The adjustment mechanism (3) includes a ring rib (31), the outer side of which is fixedly connected to the outer side of the outer steel bar (23). The outer side of the ring rib (31) is fixedly connected to a first fixing block (32) and a second fixing block (33). The inner side of the first fixing block (32) is fixedly connected to a fixing screw (34), and the outer side of the fixing screw (34) is threaded with a rotating screw (35).
7. A prestressed foundation pit retaining bored pile according to claim 6, characterized in that: The outside of the rotating screw (35) is in contact with the outside of the fixed block two (33), and the outside of the fixed screw (34) is slidably connected to the inside of the fixed block two (33).
8. A prestressed foundation pit retaining bored pile according to claim 6, characterized in that: The outer side of the ring rib (31) is fixedly connected to the inside of the outer concrete column (1), and the outer side of the fixing block (32) is fixedly connected to the inside of the outer concrete column (1).