A type of prestressed concrete irregular hollow tension pile

Abstract

This utility model provides a prestressed concrete irregular hollow pull-out pile, including a concrete pile body and pile end plates at the ends of the concrete pile body. Adjacent concrete pile bodies are connected and fixed through their respective pile end plates. Multiple semi-groove structures are evenly distributed on the outer periphery of the pile end plates. The end faces of the pile end plates of adjacent concrete pile bodies abut against each other, so that the openings on the adjacent sides of their respective semi-groove structures are joined to form a positioning groove that is narrow in the middle and thick at both ends. A positioning pin is inserted and fixed in the positioning groove. The outer contour shape of the positioning pin is concave and convex with the inner edge shape of the positioning groove. This design effectively improves the shear and pull-out resistance at the pile segment joint position. Moreover, this joint design can ensure the accuracy of the joint position and avoid stress concentration caused by splicing deviation. The structure is simple and practical and can effectively adapt to various spliced ​​beams. It solves the technical problem that the existing prestressed concrete pull-out piles have insufficient mechanical properties, making it difficult to balance the pile's bearing capacity and cost.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and more specifically, to a prestressed concrete irregular hollow anti-uplift pile. Background Technology

[0002] In engineering practice to resist buoyancy on foundations, traditional cast-in-place concrete pull-out piles require complex procedures such as drilling, reinforcement cage installation, concrete pouring, and curing. This construction method has inherent drawbacks, including long operation cycles, high labor requirements, and quality constraints due to site conditions. Furthermore, issues such as mud removal, noise pollution, and site disturbance generated during construction are particularly prominent in urban built-up areas and environmentally sensitive regions.

[0003] Precast concrete piles improve component quality and construction efficiency through factory production, but their inherent solid cross-section structure results in excessive self-weight of each pile section. This significantly increases the difficulty of transportation and hoisting, and also raises the requirements for construction equipment. Furthermore, the currently commonly used pile connection method mainly relies on the clamping force provided by prestressing. This simple mechanical connection method exhibits significant performance deficiencies under complex loads, and the shear and pull-out resistance at the joints often becomes the weakest link in the entire structural system.

[0004] Special-shaped piles with bamboo-like or threaded surfaces, developed to enhance tensile strength, improve load-bearing performance by increasing the pile-soil contact area, but also introduce new technical challenges. These pile types require extremely high manufacturing precision; misalignment during on-site assembly can easily occur, leading to gaps or stress concentration at the joints. More importantly, existing special-shaped piles still use ordinary reinforced concrete structures, which are prone to cracking under sustained tensile loads. This not only affects the structure's durability but also reduces the overall stiffness and load-bearing capacity of the pile.

[0005] In summary, existing prestressed concrete pull-out piles suffer from insufficient mechanical properties, making it difficult to balance the pile's bearing capacity with its cost. Summary of the Invention

[0006] The technical problem to be solved by this utility model is that the existing prestressed concrete pull-out piles have insufficient mechanical properties, making it difficult to balance the bearing capacity and cost of the piles.

[0007] To address the aforementioned problems, this utility model provides a prestressed concrete irregular hollow pull-out pile, comprising multiple hollow concrete piles and pile end plates positioned and connected to the ends of the concrete piles. Adjacent concrete piles are connected and fixed by grooves welded along the circumferential direction on the pile end plates at their respective ends, and by two wedge-shaped pins on each side. The pile end plates have the same outer contour shape as the ends of the concrete piles. Multiple semi-groove structures are evenly distributed on the outer circumferential wall of the pile end plates. The semi-groove structures connect the two end faces of the pile end plates in the thickness direction. The opening size of the semi-groove structure on the end face of the pile end plate facing away from the concrete pile it is smaller than the opening size on the end face facing the concrete pile. The end faces of the pile end plates of adjacent concrete piles abut against each other, so that the openings on the adjacent sides of their respective semi-groove structures are joined to form a positioning groove that is narrow in the middle and thick at both ends. A positioning pin is inserted and fixed in the positioning groove, and the outer contour shape of the positioning pin is concave-convex with the inner edge shape of the positioning groove.

[0008] This utility model provides a novel design for prestressed concrete irregular hollow pull-out piles. The structural foundation is a traditional multi-segment, end-to-end pile structure. The connection structure between adjacent pile segments is optimized. The pile ends of adjacent concrete piles are connected and fixed via pile end plates. The outer contour shape of the pile end plates matches the concrete pile body to ensure the integrity of the pile sidewall structure. A semi-groove is provided on the outer peripheral wall of the pile end plate. A complete positioning groove is formed by connecting the openings of the semi-groove structures of two adjacent, fitted pile end plates. A good connection effect is ensured by inserting positioning pins with shapes matching the groove shape into the positioning groove. The semi-groove structure is tapered at one end and thickened at the other. The structure is such that the two halves of the groove structure can be joined together by their respective narrow opening ends to form a groove structure that is narrow in the middle and thick at both ends. The positioning groove is also adapted to the shape of the groove, which is narrow in the middle and thick at both ends. This pin and groove matching method can ensure that the end plates of the two pile bodies are tightly fitted. The design of the positioning groove and positioning pin being evenly distributed along the outer peripheral wall of the end of the concrete pile body can ensure that the two concrete pile bodies connected by the positioning pin are tightly fitted, effectively improving the shear and pull-out resistance of the pile segment joint position. Moreover, this joint design can ensure the accuracy of the joint position and avoid stress concentration caused by splicing deviation. The structure is simple and practical and can effectively adapt to various spliced ​​beams.

[0009] Furthermore, this structural optimization significantly enhances the mechanical interlocking and bonding effect between the pile and the surrounding soil, thereby greatly improving lateral friction and pull-out bearing capacity. Simultaneously, the pre-embedded high-strength prestressed steel bars in the pile core provide effective pre-stress to the pile body, inhibiting concrete cracking and ensuring the integrity of the pile body, while also tightly connecting the various irregularly shaped pile segments into a high-strength whole. This synergistic working mechanism of the "irregularly shaped outer wall" and the "prestressed core" achieves a balance between load-bearing capacity, structural integrity, and ease of construction, effectively solving the technical problem of insufficient mechanical properties in existing prestressed concrete pull-out piles, which makes it difficult to balance the pile's load-bearing capacity and cost.

[0010] As a preferred embodiment, the semi-groove structure is trapezoidal in shape, and the semi-groove structures on adjacent pile end plates are connected to form a double dovetail groove. This design provides a preferred semi-groove structure, with the trapezoidal groove preferably being an isosceles trapezoid. In this way, the narrow ends of the two semi-groove structures can be joined to form a double dovetail groove shape. With the help of the same-shaped positioning pin, a stable fixing effect can be provided, and the structure of the groove and the pin is simple and easy to process and form.

[0011] As a preferred embodiment, the pile end plate has multiple end plate holes evenly distributed, the positions of which correspond to the solid concrete positions of the concrete pile. These holes are used to insert prestressed rods, one end of which is anchored to the concrete pile to secure the pile end plate to the end of the concrete pile. This design provides a preferred method for connecting and fixing the end plate to the pile body. Multiple evenly distributed prestressed rods of a certain length are used to anchor the pile end plate to the end face of the concrete pile, ensuring that the end plate and the pile body are a single unit and guaranteeing the effectiveness of the structure connecting the two pile bodies through their two end faces.

[0012] As a preferred embodiment, one end of the prestressed rod is provided with an enlarged end head, the end plate hole is elongated, and both ends of the end plate hole are provided with circular holes. The two circular holes are connected by a rectangular hole with a width smaller than the diameter of the circular holes. One of the circular holes has a diameter larger than the outer diameter of the end head of the prestressed rod, and the inner edge of the other circular hole conforms to the outer contour of the end head of the prestressed rod. This design provides a preferred fitting method between the end plate and the prestressed rod. The end plate hole for inserting the prestressed rod is a non-circular hole with two circular ends and a narrower rectangular section in the middle. The larger diameter end of the hole facilitates the passage of the end head of the prestressed rod, the middle rectangular section allows the thinner part of the prestressed rod to slide through, and the other smaller diameter section can conform to the end head of the prestressed rod for positioning.

[0013] As a preferred embodiment, the holes in each end plate are evenly distributed along a rectangular trajectory. This design optimizes the distribution of the holes on the pile end plate, adapts to the irregular end plate hole design in the above-mentioned design, and can ensure that the prestressed rods are not easily misaligned after anchoring, thus ensuring the firmness of the fixation between the end plate and the pile.

[0014] As a preferred embodiment, the two pile end plates between adjacent concrete piles are welded together. This design further optimizes the connection between the two pile end plates that abut against each other at the pile docking position. Based on the structure of insertion positioning between positioning pins and positioning grooves, the end faces of the abutting end plates are further welded together, preferably using a three-layer full welding method with four corner welds.

[0015] As a preferred embodiment, a pile tip plate is fixed to the outer end of the concrete pile body at the end of the prestressed concrete irregular hollow tension pile. The pile tip plate includes a plate-shaped portion that fits against the end of the concrete pile body and a pile tip portion fixed to one side of the plate-shaped portion. This design provides a preferred pile end structure design, where the pile tip plate is located at the end of the prestressed concrete irregular hollow tension pile as a whole. The pile tip structure at the end facilitates pile installation, and the plate-shaped portion facilitates a firm fixation with the pile body. The aforementioned anchoring design is preferred.

[0016] As a preferred embodiment, the pile tip includes a conical pile tip side plate, with a pile tip head member fixedly connected to the apex of the conical pile tip side plate. The pile tip side plate, the pile tip head member, and the plate-shaped portion are coaxial with their respective centers. This design further optimizes the structure of the pile tip plate in the above design. The main body of the pile tip is a conical pile tip side plate, and to ensure that the structure of the conical apex is sturdy and not easily damaged during pile planting, a solid pile tip head member is specially provided at the apex of the conical pile tip side plate.

[0017] As a preferred embodiment, the plate-shaped portion includes an inner plate and an outer plate that fit together. The outer contour shape of the inner plate is consistent with the outer contour shape of the concrete pile end face, and the outer plate is annular and fits and is fixed to the base of the pile tip side plate. This design optimizes the structure of the plate-shaped portion of the pile tip plate. The shape of the inner plate is consistent with the outer contour shape of the concrete pile end face to ensure complete fit and fixation with the concrete pile end face, and it is preferably anchored by a prestressed rod. The base shape of the outer plate, which is adapted to the pile tip side plate, is annular and used to fix the pile tip side plate to the concrete pile end face. The inner plate and the outer plate are preferably fixed by welding, and the outer plate and the pile tip side plate are also fixed by welding.

[0018] As a preferred embodiment, the concrete pile includes a hollow column-shaped concrete infill and spiral stirrups embedded within the concrete infill, the spiral stirrups being coaxial with the concrete pile. The spiral stirrups effectively ensure a tight bond between the stirrups and the concrete infill, and this stirrup design also improves the tensile strength of the pile itself.

[0019] The materials used in the above technical solutions are described as follows: the concrete strength grade of the anti-uplift hollow square pile is C60 or above; the preferred material for the prestressed rod is low-relaxation spiral channel steel bar; the spiral stirrups of the pile body are made of cold-drawn low-carbon steel wire for concrete products; the pile end plate, positioning pin and pile tip are made of carbon structural steel; the welding adopts carbon dioxide gas shielded welding, electric arc welding and other forms, and the weld quality should not be lower than level II. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structure of a prestressed concrete irregular hollow anti-tension pile provided for this utility model; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of a prestressed concrete irregular hollow pull-out pile; Figure 3 for Figure 1 A partial cross-sectional structural diagram of a prestressed concrete irregular hollow pull-out pile; Figure 4 for Figure 1 A schematic diagram of the end plate of a prestressed concrete irregular hollow pull-out pile; Figure 5 for Figure 4 A partially enlarged structural diagram of the end plate of the central pile; Figure 6 for Figure 1 A partially enlarged structural diagram of the connection point between the end plates of two adjacent piles; Figure 7 for Figure 1 A schematic diagram of the positioning pin on the end plate of the connecting pile; Figure 8 This is a partially enlarged structural diagram of the connection point between two pile end plates; Figure 9 for Figure 8 A schematic diagram of the positioning pin on the end plate of the connecting pile; Figure 10 for Figure 1 A schematic diagram of a partial cross-sectional structure at the top of a prestressed concrete irregular hollow pull-out pile.

[0021] in, Figures 1-10 middle: 1. Concrete pile; 2. Pile end plate; 3. Positioning pin; 4. Pile tip plate; 4-1. Inner plate; 4-2. Outer plate; 4-3. Pile tip side plate; 4-4. Pile tip head piece; 5. Concrete filling; 6. Prestressed rod; 7. Spiral stirrup; 8. Semi-groove structure; 9. End plate hole; 9-1. Circular hole; 9-2. Rectangular hole. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Before providing a detailed explanation of the working principle of this utility model, further clarification is needed regarding its description: In this description, terms such as "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welded connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] refer to Figures 1-10 The following examples illustrate this. Figure 1 A schematic diagram of the overall structure of a prestressed concrete irregular hollow anti-tension pile provided for this utility model; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of a prestressed concrete irregular hollow pull-out pile; Figure 3 for Figure 1 A partial cross-sectional structural diagram of a prestressed concrete irregular hollow pull-out pile; Figure 4 for Figure 1 A schematic diagram of the end plate of a prestressed concrete irregular hollow pull-out pile; Figure 5 for Figure 4 A partially enlarged structural diagram of the end plate of the central pile; Figure 6 for Figure 1 A partially enlarged structural diagram of the connection point between the end plates of two adjacent piles; Figure 7 for Figure 1 A schematic diagram of the positioning pin on the end plate of the connecting pile; Figure 8 This is a partially enlarged structural diagram of the connection point between two pile end plates; Figure 9 for Figure 8 A schematic diagram of the positioning pin on the end plate of the connecting pile; Figure 10 for Figure 1 A schematic diagram of a partial cross-sectional structure at the top of a prestressed concrete irregular hollow pull-out pile.

[0026] This embodiment provides a prestressed concrete irregular hollow pull-out pile, including multiple hollow concrete piles 1 and pile end plates 2 positioned and connected to the ends of the concrete piles 1. Adjacent concrete piles 1 are connected and fixed by their respective pile end plates 2. The pile end plates 2 have the same outer contour shape as the ends of the concrete piles 1. Multiple semi-groove structures 8 are evenly distributed on the outer peripheral wall of the pile end plates 2. The semi-groove structures 8 connect the two end faces of the pile end plates 2 in the thickness direction. The opening size of the semi-groove structure 8 on the end face of the pile end plate 2 away from the concrete pile 1 it is positioned is smaller than the opening size on the end face facing the concrete pile 1. The end faces of the pile end plates 2 of adjacent concrete piles 1 abut against each other, so that the openings of the adjacent sides of their respective semi-groove structures 8 are joined to form a positioning groove that is thin in the middle and thick at both ends. A positioning pin 3 is inserted and fixed in the positioning groove. The outer contour shape of the positioning pin 3 is concave and convex with the inner edge shape of the positioning groove.

[0027] During the assembly of the anti-tension pile component, the stirrups of the precast concrete pile body 1 are processed, welded and assembled in the factory, and concrete is poured into the inside of the assembled template. After curing, it is transported to the site, and positioning pins 3 are inserted into the positioning grooves of the pile end plates 2 set between the upper and lower adjacent concrete pile bodies 1. Preferably, the outer edges of the pile end plates 2 set between adjacent concrete pile bodies 1 are fully welded in three layers through the four corner welds to complete the installation of the anti-tension pile.

[0028] This utility model provides a novel design for prestressed concrete irregular hollow pull-out piles. The structural foundation is a traditional multi-segment pile integral structure connected end to end. The connection structure between adjacent pile segments is optimized. The pile ends of adjacent concrete piles 1 are connected and fixed by pile end plates 2. The outer contour shape of the pile end plates 2 matches the concrete piles 1 to ensure the integrity of the pile sidewall structure. A semi-groove is set on the outer peripheral wall of the pile end plates 2. The openings of the semi-groove structures 8 of two adjacent and fitting pile end plates 2 are connected to form a complete positioning groove. A good connection effect is ensured by inserting positioning pins 3 with shapes matching the groove shape into the positioning groove. The shape of the semi-groove structure 8 is thinner at one end and thinner at the other. The coarse structure allows the two halves of the groove structure 8 to be joined together through their respective narrow opening ends to form a groove structure that is narrow in the middle and thick at both ends. The positioning groove is also adapted to the shape of the groove, which is narrow in the middle and thick at both ends. This pin and groove matching method can ensure that the two pile end plates 2 that are abutting each other are tightly fitted. The design of the positioning groove and positioning pin 3 being evenly distributed along the outer peripheral wall of the end of the concrete pile body 1 can ensure that the two concrete pile bodies 1 connected by the positioning pin 3 are tightly fitted, effectively improving the shear and pull-out resistance of the pile segment joint position. Moreover, this joint design can ensure the accuracy of the joint position and avoid stress concentration caused by splicing deviation. The structure is simple and practical and can effectively adapt to various spliced ​​beams.

[0029] Furthermore, this structural optimization significantly enhances the mechanical interlocking and bonding effect between the pile and the surrounding soil, thereby greatly improving lateral friction and pull-out bearing capacity. Simultaneously, the pre-embedded high-strength prestressed steel bars in the pile core provide effective pre-stress to the pile body, inhibiting concrete cracking and ensuring the integrity of the pile body, while also tightly connecting the various irregularly shaped pile segments into a high-strength whole. This synergistic working mechanism of the "irregularly shaped outer wall" and the "prestressed core" achieves a balance between load-bearing capacity, structural integrity, and ease of construction, effectively solving the technical problem of insufficient mechanical properties in existing prestressed concrete pull-out piles, which makes it difficult to balance the pile's load-bearing capacity and cost.

[0030] In the technical solution provided in this embodiment, the semi-groove structure 8 is trapezoidal in shape, and the semi-groove structures 8 on adjacent pile end plates 2 are connected to form a double dovetail groove. This design provides a preferred design for the semi-groove structure 8, which adopts a trapezoidal groove, preferably an isosceles trapezoid shape. In this way, the narrow ends of the two semi-groove structures 8 can be joined to form a double dovetail groove shape. With the matching positioning pin 3, a stable fixing effect can be provided, and the structure of the groove and the pin is simple and easy to process and form.

[0031] In addition to the trapezoidal groove semi-groove structure 8 mentioned above, the semi-groove structure 8 can also be a T-shaped structure. When the thin ends of the two semi-groove structures are joined together, they can form an I-shaped positioning groove, and the positioning pin 3 is also I-shaped, which can play a good pin positioning effect.

[0032] In the technical solution provided in this embodiment, multiple end plate holes 9 are evenly distributed on the pile end plate 2. The positions of the end plate holes 9 correspond to the solid concrete positions of the concrete pile 1. The end plate holes 9 are used to insert prestressed rods 6, one end of which is anchored to the concrete pile 1 to anchor the pile end plate 2 to the end of the concrete pile 1. This design provides a preferred method for connecting and fixing the end plate to the pile body. By using multiple evenly distributed prestressed rods 6 of a certain length, the pile end plate is attached and anchored to the end face of the concrete pile 1, thereby ensuring that the end plate and the pile body are a whole and also ensuring the effectiveness of the structure that connects the two pile bodies through the two end faces.

[0033] In the technical solution provided in this embodiment, one end of the prestressed rod 6 is provided with an enlarged end head. The end plate hole 9 is elongated, and both ends of the end plate hole 9 are provided with circular holes 9-1. The two circular holes 9-1 are connected by a rectangular hole 9-2 with a width smaller than the diameter of the circular holes 9-1. The diameter of one of the circular holes 9-1 is larger than the outer diameter of the end head of the prestressed rod 6, and the inner edge shape of the other circular hole 9-1 is concave-convex with the outer contour shape of the end head of the prestressed rod 6. This design provides a preferred matching method between the end plate and the prestressed rod 6. The end plate hole 9 for inserting the prestressed rod 6 is a special-shaped hole with two circular ends and a narrower rectangular section in the middle. The larger diameter end of the hole is used to facilitate the passage of the end head of the prestressed rod 6, the middle rectangular section is used for the sliding passage of the thinner part of the prestressed rod 6, and the other smaller diameter hole can be positioned by the concave-convex fit with the end head of the prestressed rod 6.

[0034] In the technical solution provided in this embodiment, the end plate holes 9 are evenly distributed along a rectangular trajectory. This design optimizes the distribution of the end plate holes 9 on the pile end plate 2, adapting to the irregular end plate hole 9 design in the above-mentioned design, which can ensure that the prestressed rod 6 after anchoring is not easily misaligned, thus ensuring the firmness of the fixation between the end plate and the pile.

[0035] In the technical solution provided in this embodiment, the two pile end plates 2 between adjacent concrete piles 1 are welded together. This design further optimizes the connection between the two pile end plates 2 that abut against each other at the pile docking position. Based on the structure of the positioning pin 3 and the positioning groove being inserted and positioned, the end faces of the abutting end plates are further welded and fixed. Preferably, a welding and fixing method of three layers of full welding with four corner welds is adopted.

[0036] In the technical solution provided in this embodiment, a pile tip plate 4 is fixed to the outer end of the concrete pile body 1 located at the end of the prestressed concrete irregular hollow tension pile. The pile tip plate 4 includes a plate-shaped portion that fits against the end of the concrete pile body 1 and a pile tip portion fixed to one side of the plate-shaped portion. This design provides a preferred pile end structure design. The pile tip plate 4 is located at the end of the prestressed concrete irregular hollow tension pile as a whole. The pile tip structure at the end facilitates pile planting, and the plate-shaped portion facilitates a firm fixation with the pile body. The above-mentioned anchoring design is preferred.

[0037] In the technical solution provided in this embodiment, the pile tip includes a conical pile tip side plate 4-3, and a pile tip head piece 4-4 is fixedly connected to the apex of the conical pile tip side plate 4-3. The pile tip side plate 4-3, the pile tip head piece 4-4, and the plate-shaped part are coaxial with their respective centers. This design further optimizes the structure of the pile tip plate 4 in the above design. The main body of the pile tip is a conical pile tip side plate 4-3, and in order to ensure that the structure of the conical apex is sturdy and not easily damaged during the pile planting process, a solid pile tip head piece 4-4 is specially set at the apex of the conical pile tip side plate 4-3.

[0038] In the technical solution provided in this embodiment, the plate-shaped part includes an inner plate 4-1 and an outer plate 4-2 that fit together. The outer contour shape of the inner plate 4-1 is consistent with the outer contour shape of the end face of the concrete pile 1. The outer plate 4-2 is annular and fits and is fixed to the base of the pile tip side plate 4-3. This design optimizes the structure of the plate-shaped part of the pile tip plate 4. The shape of the inner plate 4-1 is consistent with the outer contour shape of the end face of the concrete pile 1 to ensure that it fits and is fixed to the end face of the concrete pile 1 completely, and preferably is anchored by a prestressed rod 6. The outer plate 4-2 is annular to fit the base shape of the pile tip side plate 4-3 and is used to fix the pile tip side plate 4-3 to the end face of the concrete pile 1. The inner plate 4-1 and the outer plate 4-2 are preferably fixed by welding, and the outer plate 4-2 and the pile tip side plate 4-3 are also fixed by welding.

[0039] In the technical solution provided in this embodiment, the concrete pile 1 includes a hollow column-shaped concrete filler 5 and a spiral stirrup 7 embedded in the concrete filler 5. The spiral stirrup 7 is coaxial with the concrete pile 1. The spiral stirrup 7 can effectively ensure the tight bond between the stirrup and the concrete filler 5, and this stirrup design also improves the tensile strength of the pile itself.

[0040] The precast assembled concrete pile 1 includes prestressed steel bars, spiral stirrups and filling concrete. The spiral stirrups 7 are located 1500mm inward from the upper and lower ends of the concrete pile 1. The spacing between the spiral structures is between 50mm and 100mm. The number of end plate holes 9 in each pile end plate 2 is preferably 8. The number of semi-groove structures 8 distributed on the outer peripheral wall of the pile end plate 2 is also preferably 8.

[0041] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A prestressed concrete irregular hollow pull-out pile, comprising a plurality of hollow concrete pile bodies (1) and pile end plates (2) positioned and connected to the ends of the concrete pile bodies (1), wherein adjacent concrete pile bodies (1) are connected and fixed by the pile end plates (2) at their respective ends, characterized in that, The end plate (2) of the pile body is consistent with the outer contour shape of the end of the concrete pile (1). The end plate (2) of the pile body has a plurality of semi-groove structures (8) evenly distributed on its outer peripheral wall. The semi-groove structures (8) connect the two end faces of the end plate (2) in the thickness direction. The opening size of the semi-groove structure (8) on the end face of the end plate (2) away from the concrete pile (1) it is positioned is smaller than the opening size on the end face facing the concrete pile (1). The end faces of the end plates (2) of the adjacent concrete piles (1) abut each other, so that the openings of the adjacent sides of their respective semi-groove structures (8) are connected to form a positioning groove that is thin in the middle and thick at both ends. A positioning pin (3) is inserted and fixed in the positioning groove. The outer contour shape of the positioning pin (3) is in concave-convex fit with the inner edge shape of the positioning groove.

2. The prestressed concrete special-shaped hollow uplift pile according to claim 1, characterized in that, The semi-groove structure (8) is trapezoidal in shape, and the semi-groove structures (8) on adjacent pile end plates (2) are connected to form a double dovetail groove.

3. The prestressed concrete special-shaped hollow uplift pile according to claim 1, characterized in that, The pile end plate (2) has a plurality of end plate holes (9) evenly distributed on it. The position of the end plate holes (9) corresponds to the position of the solid concrete of the concrete pile (1). The end plate holes (9) are used to insert prestressed rods (6). One end of the prestressed rods (6) is anchored to the concrete pile (1) so as to anchor the pile end plate (2) to the end of the concrete pile (1).

4. The prestressed concrete special-shaped hollow uplift pile according to claim 3, characterized in that, One end of the prestressed rod (6) is provided with an enlarged end head. The end plate hole (9) is an elongated hole type. Both ends of the end plate hole (9) are provided with circular holes (9-1). The two circular holes (9-1) are connected by a rectangular hole (9-2) with a width smaller than the diameter of the circular hole (9-1). The diameter of one of the circular holes (9-1) is larger than the outer diameter of the end head of the prestressed rod (6). The inner edge shape of the other circular hole (9-1) is in concave-convex fit with the outer contour shape of the end head of the prestressed rod (6).

5. The prestressed concrete special-shaped hollow uplift pile according to claim 4, characterized in that, The end plate holes (9) are evenly distributed along a rectangular trajectory.

6. The prestressed concrete special-shaped hollow uplift pile according to any one of claims 1-5, characterized in that, The two pile end plates (2) between adjacent concrete piles (1) are welded together.

7. The prestressed concrete special-shaped hollow uplift pile according to claim 6, characterized in that, A pile tip plate (4) is fixed at the outer end of the concrete pile body (1) located at the end of the prestressed concrete irregular hollow pull-out pile. The pile tip plate (4) includes a plate-shaped part that fits the end of the concrete pile body (1) and a pile tip part fixed to one side of the plate-shaped part.

8. The prestressed concrete special-shaped hollow uplift pile according to claim 7, characterized in that, The pile tip includes a cone-shaped pile tip side plate (4-3), and a pile tip head piece (4-4) is fixedly connected to the cone top of the pile tip side plate (4-3). The pile tip side plate (4-3), the pile tip head piece (4-4) and the plate-shaped part are coaxial with their respective centers.

9. The prestressed concrete special-shaped hollow uplift pile according to claim 8, characterized in that, The plate-shaped part includes an inner plate (4-1) and an outer plate (4-2) that fit together. The outer contour shape of the inner plate (4-1) is consistent with the outer contour shape of the end face of the concrete pile (1). The outer plate (4-2) is annular and fits and is fixed to the base of the pile tip side plate (4-3).

10. The prestressed concrete special-shaped hollow uplift pile according to claim 6, characterized in that, The concrete pile (1) comprises a concrete filling (5) in the form of a hollow column and a spiral stirrup (7) embedded in the concrete filling (5), the spiral stirrup (7) being coaxial with the concrete pile (1).

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